Oil stain detection processing circuit and kitchen air conditioner

Abstract

The utility model discloses a greasy dirt detecting and processing circuit and a kitchen air conditioner, and the greasy dirt detecting and processing circuit comprises a control chip; the output end of the transmitting and receiving circuit is electrically connected with the control chip, and the transmitting and receiving circuit is used for detecting the liquid level in the oil box through transmitting and receiving of infrared rays and outputting a state detection signal of a corresponding level; the trigger switch is used for shielding / not shielding the infrared rays according to the liquid level in the oil box; the input end of the oil pump driving circuit is electrically connected with the control chip, the output end of the oil pump driving circuit is used for being electrically connected with an oil pump, and the oil pump driving circuit is further used for driving the oil pump to pump out oil in the oil box under the control of the control chip; the control chip is used for controlling the oil pump driving circuit to work for a preset time period according to the received state detection signal of the first level; according to the technical scheme, the kitchen air conditioner can treat oil dirt in time, and the oil dirt is prevented from being overfilled.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen air conditioners, in particular to an oil pollution detection and processing circuit and a kitchen air conditioner. Background Art

[0002] At present, many families have introduced kitchen air conditioners, which can reduce the temperature appropriately when cooking. However, the air conditioner will inevitably accumulate a lot of oil stains when working in a high-concentration oil fume environment for a long time. When the accumulated oil stains in the oil box are too full and not handled in time, it is easy to overflow, causing equipment, kitchen floors, and countertops to be covered with oil stains that are difficult to clean, and easily breed bacteria and attract cockroaches, rats, ants, etc. Utility Model Content

[0003] The main purpose of the utility model is to provide an oil stain detection and processing circuit and a kitchen air conditioner, aiming to enable the kitchen air conditioner to process the oil stain in time and avoid being overfilled with oil stain.

[0004] To achieve the above-mentioned purpose, the oil stain detection and processing circuit proposed by the utility model is applied to a kitchen air conditioner, the kitchen air conditioner includes an oil pump and an oil box, and the oil stain detection and processing circuit includes:

[0005] Control chip;

[0006] A transceiver circuit, the output end of which is electrically connected to the control chip, and is used to detect the liquid level in the oil box by transmitting and receiving infrared rays, and output a status detection signal of a corresponding level;

[0007] A trigger switch, used for shielding the infrared ray when the liquid level in the oil box reaches the warning liquid level, so that the transceiver circuit outputs a state detection signal of a first level;

[0008] An oil pump driving circuit, wherein an input end of the oil pump driving circuit is electrically connected to the control chip, and an output end of the oil pump driving circuit is used to be electrically connected to the oil pump and is also used to drive the oil pump to pump out the oil in the oil box under the control of the control chip;

[0009] The control chip is used to control the oil pump drive circuit to work for a preset period of time when receiving the state detection signal of the first level.

[0010] In some embodiments, the transceiver circuit includes a transmitting component and a receiving component;

[0011] The transmitting assembly and the receiving assembly are arranged at a distance from each other on the top of the oil box and form a corresponding gap. The trigger switch is arranged inside the oil box and is arranged relative to the gap.

[0012] When the liquid level in the oil box reaches the warning liquid level, the trigger switch is used to insert into the gap to block the infrared rays output by the transmitting component.

[0013] In some embodiments, the transceiver circuit includes:

[0014] A transmitting circuit, wherein the input end of the transmitting circuit is used to connect to a power supply, the controlled end of the transmitting circuit is electrically connected to the control chip, and is also used to continuously transmit infrared rays under the drive of the control chip;

[0015] A receiving circuit, wherein the input end of the receiving circuit is used to connect to the power supply, and is also used to output a corresponding liquid level detection voltage when the infrared ray is received / not received;

[0016] The comparison circuit, the first input end of the transmitting circuit is used to access the reference voltage, the second input end of the transmitting circuit is connected to the output end of the receiving circuit, and is also used to output the first level state detection signal when the received liquid level detection voltage is lower than the reference voltage.

[0017] In some embodiments, the transmitting circuit comprises:

[0018] A first switch tube has a first input end, a first output end and a first controlled end, wherein the first output end is grounded;

[0019] A first resistor, wherein a first end of the first resistor is used to connect to a power source;

[0020] a transmitting tube, an anode of which is connected to the second end of the first resistor, and a cathode of which is connected to the first input end;

[0021] A second resistor is connected in series between the first controlled end and the control chip;

[0022] The third resistor is connected in parallel to the first output terminal and the first controlled terminal.

[0023] In some embodiments, the receiving circuit includes:

[0024] a fourth resistor, wherein a first end of the fourth resistor is used to be connected to the power supply, and a second end of the fourth resistor is connected to the second input end of the comparison circuit;

[0025] A receiving tube, wherein an anode of the receiving tube is connected to the second end of the fourth resistor, and a cathode of the receiving tube is grounded.

[0026] In some embodiments, the comparison circuit comprises:

[0027] A comparator, comprising a positive input terminal, a negative input terminal, an output terminal, a power supply terminal and a ground terminal, wherein the power supply terminal is used to connect to the power supply, the ground terminal is grounded, the positive input terminal is the first input terminal of the comparator circuit, and the negative input terminal is the second input terminal of the comparator circuit;

[0028] A first capacitor connected in series between the power supply terminal and the ground;

[0029] A fifth resistor is connected in series between the output terminal of the comparator and the control chip;

[0030] A sixth resistor has a first end connected to the power supply and a second end connected to the output end of the comparator.

[0031] In some embodiments, the comparison circuit further comprises:

[0032] a seventh resistor, wherein a first end of the seventh resistor is used for connecting to the power supply;

[0033] An indicator light, wherein an input end of the indicator light is connected to the second end of the seventh resistor, and an output end of the indicator light is connected to the output end of the comparator.

[0034] In some embodiments, the oil pollution detection processing circuit further includes:

[0035] A reference level generating circuit, wherein the input end of the reference level generating circuit is used to access the power supply, the output end of the reference level generating circuit is connected to the first input end of the comparison circuit, and the reference level generating circuit is used to perform voltage conversion processing on the power supply and output a corresponding reference voltage.

[0036] In some embodiments, the oil pump driving circuit includes:

[0037] A second switch tube has a second input end, a second output end and a second controlled end;

[0038] A third switch tube has a third input end, a third output end and a third controlled end, wherein the third input end is used to connect to the reverse power supply end of the oil pump;

[0039] an eighth resistor, a first end of which is used to be connected to a power supply, and a second end of which is connected to the second input end;

[0040] a ninth resistor, a first end of which is electrically connected to the control chip, and a second end of which is connected to the second controlled end;

[0041] a tenth resistor, connected in series between the second output terminal and ground;

[0042] an eleventh resistor connected in series between the second output terminal and the third controlled terminal,

[0043] The twelfth resistor is connected in parallel to the third controlled end and the third output end.

[0044] The utility model also provides a kitchen air conditioner, which includes an oil pump, an oil box and the above-mentioned oil pollution detection and processing circuit. The oil pump is arranged in the oil box and is electrically connected to the oil pollution detection and processing circuit.

[0045] The technical solution of the utility model detects the liquid level in the oil box in real time by combining the transceiver circuit with the trigger switch, and outputs status detection signals of different levels to represent different states of the liquid level. When the liquid level rises, the trigger switch blocks the infrared rays under the push of the liquid level, so that the status detection signal output by the transceiver circuit is converted to the first level, the control chip is triggered, the oil pump is driven to work immediately, and the preset time is delayed to completely discharge the liquid in the oil box, so that the oil stains can be processed in time to avoid the situation where the equipment, kitchen floors, and countertops are covered with oil stains due to excessive overflow of the oil stains, which are difficult to clean and easy to breed bacteria and attract cockroaches, rats, ants, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0047] Figure 1 This is a structural schematic diagram of an embodiment of an oil pollution detection and processing circuit of the utility model;

[0048] Figure 2 It is a structural schematic diagram of another embodiment of the oil pollution detection and processing circuit of the utility model;

[0049] Figure 3 It is a structural schematic diagram of another embodiment of the oil pollution detection and processing circuit of the utility model;

[0050] Figure 4 This is a circuit connection diagram of an embodiment of a transmitting circuit in the utility model;

[0051] Figure 5 This is a circuit connection diagram of an embodiment of the oil pollution detection and processing circuit of the utility model;

[0052] Figure 6 This is a circuit connection diagram of an embodiment of the oil pump drive circuit of the utility model;

[0053] Figure 7 It is a structural schematic diagram of an embodiment of the kitchen air conditioner of the present utility model.

[0054] Description of Figure Numbers:

[0055] Label name Label name 110 Control chip 200 Oil box 120 Transceiver circuit 300 Oil Pump 121 Transmitter Q1~Q3 The first switch tube to the third switch tube 122 Receiving Components D1 Transmitter tube 123 Transmitter circuit D2 Receiver tube 124 Receiving Circuit D3 Indicator Lights 125 Comparison Circuit U1 Comparator 130 Trigger switch C1 First capacitor 140 Oil pump drive circuit R1~R14 The first resistor to the fourteenth resistor 150 Reference level generation circuit RL Voltage Divider Resistor

[0056] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0058] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0059] The utility model provides an oil pollution detection and processing circuit, which is applied to a kitchen air conditioner. The kitchen air conditioner comprises an oil pump and an oil box.

[0060] Reference Figure 1 In one embodiment, the oil pollution detection processing circuit includes:

[0061] Control chip 110;

[0062] A transceiver circuit 120, the output end of which is electrically connected to the control chip 110, for detecting the liquid level in the oil box by transmitting and receiving infrared rays, and outputting a status detection signal of a corresponding level;

[0063] A trigger switch 130, used to block the infrared ray when the liquid level in the oil box reaches the warning liquid level, so that the transceiver circuit 120 outputs a state detection signal of a first level;

[0064] An oil pump driving circuit 140, wherein an input end of the oil pump driving circuit 140 is electrically connected to the control chip 110, and an output end of the oil pump driving circuit 140 is used to be electrically connected to the oil pump and is also used to drive the oil pump to pump out the oil in the oil box under the control of the control chip 110;

[0065] The control chip 110 is used to control the oil pump driving circuit 140 to work for a preset period of time when receiving the state detection signal of the first level.

[0066] In this embodiment, the transceiver circuit 120 may include an infrared transceiver tube, a photoelectric sensor, etc. The trigger switch 130 is made of a material with a density lower than the oil level, or is a hollow object, which can float up as the liquid level rises when placed on the liquid surface.

[0067] When the kitchen air conditioner is working normally, the transmitting end of the transceiver circuit 120 emits infrared rays outward, and its receiving end may receive or fail to receive the infrared rays due to the position of the trigger switch 130. When the oil box has just been cleaned, or the kitchen air conditioner is used for a short time, there is not much oil smoke stored in the oil box, so the height at which the trigger switch 130 floats cannot intervene in the infrared transmission and reception of the transceiver circuit 120, and the infrared rays are not blocked, that is, the liquid level in the oil box has not reached the warning liquid level. At this time, the receiving end of the transceiver circuit 120 can normally receive infrared rays and output a state detection signal of a corresponding level, wherein the warning liquid level is set by the R&D personnel according to the height of the oil box during design. Since the control chip 110 does not receive the state detection signal of the first level, it will not control the oil pump drive circuit 140 to work.

[0068] As the usage time increases, the liquid level in the oil box will gradually increase, causing the trigger switch 130 to gradually float up, directly intervening in the infrared transmission and reception of the transceiver circuit 120, blocking the infrared rays, that is, the liquid level in the oil box reaches the warning level. At this time, the receiving end of the transceiver circuit 120 cannot receive the infrared rays, and outputs a first level state detection signal. After receiving the first level state detection signal, the control chip 110 starts to control the oil pump drive circuit 140 to drive the oil pump to work, and delays the work for a preset period of time to pump out the oil in the oil box. The preset period of time is determined by the volume of the oil box and the power of the oil pump, and is used to enable the oil pump to completely extract the oil smoke stored in the oil box within the preset period of time.

[0069] Specifically, Figure 7 As shown, the transceiver circuit 120 includes a transmitting component 121 and a receiving component 122;

[0070] The transmitting component 121 and the receiving component 122 are arranged at the top of the oil box 200 with a gap therebetween, and form a corresponding gap. The trigger switch 130 is arranged inside the oil box 200 and is arranged relative to the gap.

[0071] When the liquid level in the oil box 200 reaches the warning liquid level, the trigger switch 130 is used to insert into the gap to block the infrared light output by the transmitting component 121 .

[0072] In this embodiment, the transmitting component 121 and the receiving component 122 form a concave shape and are inverted on the top of the oil box, which fits with the convex trigger switch 130, so that the trigger switch 130 can rise under the action of the liquid level and be inserted between the transmitting component 121 and the receiving component 122 to block the infrared rays. In addition, since the transmitting component 121 and the receiving component 122 are arranged on the top of the oil box, the warning liquid level can be raised to the maximum extent, making full use of the storage space of the oil box.

[0073] The technical solution of the utility model detects the liquid level in the oil box in real time by combining the transceiver circuit 120 with the trigger switch 130, and outputs status detection signals of different levels to represent different states of the liquid level. When the liquid level rises, the trigger switch 130 blocks the infrared rays under the push of the liquid level, so that the status detection signal output by the transceiver circuit 120 is converted to the first level, and the control chip 110 is triggered to drive the oil pump to work immediately and delay for a preset time to completely discharge the liquid in the oil box, so as to deal with the oil stains in time and avoid the oil stains overflowing and causing the equipment, kitchen floors, and countertops to be covered with oil stains, which are difficult to clean and easy to breed bacteria and attract cockroaches, rats, ants, etc.

[0074] Reference Figure 1 to Figure 2 In one embodiment, the transceiver circuit 120 includes:

[0075] A transmitting circuit 123, wherein the input end of the transmitting circuit 123 is used to connect to a power source, and the controlled end of the transmitting circuit 123 is electrically connected to the control chip 110, and is also used to continuously transmit infrared rays under the drive of the control chip 110;

[0076] A receiving circuit 124, wherein the input end of the receiving circuit 124 is used to connect to the power supply, and is also used to output a corresponding liquid level detection voltage when the infrared ray is received / not received;

[0077] The comparison circuit 125, the first input end of the transmitting circuit 123 is used to access the reference voltage, the second input end of the transmitting circuit 123 is connected to the output end of the receiving circuit 124, and is also used to output the first level state detection signal when the received liquid level detection voltage is lower than the reference voltage.

[0078] In this embodiment, the reference voltage is set according to the voltage value of the liquid level detection voltage output by the receiving circuit 124. For example, the liquid level detection voltage output by the receiving circuit 124 when receiving infrared rays is 0V, and the liquid level detection voltage output when not receiving infrared rays is 3.3V, then the reference voltage can be 3V.

[0079] When the kitchen air conditioner is working normally, the transmitting circuit 123 is turned on under the control of the control chip 110, so that the power supply, the transmitting circuit 123 and the ground form a current loop, and the transmitting circuit 123 is driven to emit infrared rays. When the oil box has just been cleaned, or the kitchen air conditioner is used for a short time, there is not too much oil smoke stored in the oil box, so the height of the trigger switch 130 floating does not block the infrared rays. At this time, the receiving circuit 124 can normally receive the infrared rays, and the output liquid level detection voltage is higher than the reference voltage, and the comparison circuit 125 will not output the first level state detection signal.

[0080] As the usage time increases, the liquid level in the oil box will gradually increase, causing the trigger switch 130 to gradually float up until the infrared rays are blocked. At this time, the receiving circuit 124 cannot receive the infrared rays, and the output liquid level detection voltage is lower than the reference voltage. The comparison circuit 125 outputs a first level status detection signal.

[0081] Reference Figure 1 , Figure 2 and Figure 4 In one embodiment, the transmitting circuit 123 includes:

[0082] The first switch tube Q1 has a first input end, a first output end and a first controlled end, wherein the first output end is grounded;

[0083] A first resistor R1, wherein a first end of the first resistor R1 is used to connect to a power source;

[0084] A transmitting tube D1, an anode of which is connected to the second end of the first resistor R1, and a cathode of which is connected to the first input end;

[0085] A second resistor R2 is connected in series between the first controlled end and the control chip 110;

[0086] The third resistor R3 is connected in parallel to the first output terminal and the first controlled terminal.

[0087] In this embodiment, the first switch tube Q1 may include a MOS tube, a triode, an IGBT, etc.

[0088] Taking the first switch tube Q1 as an NPN type transistor as an example, when the kitchen air conditioner is working normally, the control chip 110 continuously outputs a high level to the first switch tube Q1, so that the first switch tube Q1 is turned on under the drive of the high level of the controlled end, and the power supply forms a current loop through the first resistor R1, the transmitting tube D1, the first switch tube Q1 to the ground, and the transmitting tube D1 emits infrared rays under the drive of the current.

[0089] Reference Figure 1 , Figure 2 and Figure 5 In one embodiment, the receiving circuit 124 includes:

[0090] a fourth resistor R4, wherein a first end of the fourth resistor R4 is used to be connected to the power supply, and a second end of the fourth resistor R4 is connected to the second input end of the comparison circuit 125;

[0091] A receiving tube D2, wherein an anode of the receiving tube D2 is connected to the second end of the fourth resistor R4, and a cathode of the receiving tube D2 is grounded.

[0092] In this embodiment, the anode of the receiving tube D2 is the output end of the receiving circuit 124, that is, the divided voltage of the receiving tube D2 is the output liquid level detection voltage.

[0093] It can be understood that the resistance value of the receiving tube D2 is related to whether infrared rays are received. When the receiving tube D2 can normally receive infrared rays, its resistance value increases. At this time, the voltage division ratio of the fourth resistor R4 and the receiving tube D2 decreases, and the voltage division of the receiving tube D2 increases, so that the output liquid level detection voltage is higher than the reference voltage; when the receiving tube D2 cannot receive infrared rays, its resistance value decreases. At this time, the voltage division ratio of the fourth resistor R4 and the receiving tube D2 increases, and the voltage division of the receiving tube D2 decreases, so that the output liquid level detection voltage is lower than the reference voltage.

[0094] Reference Figure 1 , Figure 2 and Figure 5 In one embodiment, the comparison circuit 125 includes:

[0095] The comparator U1 has a positive input terminal, a negative input terminal, an output terminal, a power supply terminal and a ground terminal, wherein the power supply terminal is used to connect to the power supply, the ground terminal is grounded, the positive input terminal is the first input terminal of the comparison circuit 125, and the negative input terminal is the second input terminal of the comparison circuit 125;

[0096] A first capacitor C1 is connected in series between the power supply terminal and the ground;

[0097] A fifth resistor R5 is connected in series between the output terminal of the comparator U1 and the control chip 110;

[0098] A sixth resistor R6 has a first end connected to the power supply, and a second end connected to the output end of the comparator U1.

[0099] In this embodiment, the state detection signal includes a first level and a second level, wherein the first level is a low level and the second level is a high level.

[0100] When the oil box has just been cleaned, or the kitchen air conditioner is used less frequently, there is not much oil smoke stored in the oil box. At this time, the liquid level detection voltage connected to the positive input of the comparator U1 is higher than the reference voltage connected to the reverse input. The output of the comparator U1 is pulled up to the power supply voltage by the sixth resistor R6 and outputs a high level.

[0101] As the usage time increases, the liquid level in the oil box will gradually increase. At this time, the liquid level detection voltage connected to the positive input terminal of the comparator U1 is lower than the reference voltage connected to the reverse input terminal, and the comparator U1 outputs a low level.

[0102] Furthermore, the comparison circuit 125 further includes:

[0103] a seventh resistor R7, wherein a first end of the seventh resistor R7 is used for connecting to the power supply;

[0104] The indicator light D3 has an input end connected to the second end of the seventh resistor R7, and an output end of the indicator light D3 connected to the output end of the comparator U1.

[0105] In this embodiment, the indicator light D3 may be an LED light.

[0106] When the liquid level in the oil box reaches the warning level and the comparator U1 outputs a low level, a voltage difference is formed at both ends of the indicator light D3 under the voltage of the power supply, thereby turning on the indicator light D3. The indicator light D3 lights up to indicate that the oil is full and needs to be cleaned.

[0107] Reference Figure 1 , Figure 3 and Figure 6 In one embodiment, the oil pollution detection processing circuit further includes:

[0108] A reference level generating circuit 150, wherein the input end of the reference level generating circuit 150 is used to access the power supply, the output end of the reference level generating circuit 150 is connected to the first input end of the comparison circuit 125, and the reference level generating circuit 150 is used to perform voltage conversion processing on the power supply and output a corresponding reference voltage.

[0109] In this embodiment, the reference level generating circuit 150 may be composed of at least two voltage-dividing resistors RL. By adjusting the resistance of the voltage-dividing resistor RL and changing its voltage-dividing ratio, the voltage of the power supply is divided to output a corresponding reference voltage.

[0110] Reference Figure 1 and Figure 6 In one embodiment, the oil pump driving circuit 140 includes:

[0111] The second switch tube Q2 has a second input end, a second output end and a second controlled end;

[0112] The third switch tube Q3 has a third input end, a third output end and a third controlled end, wherein the third input end is used to connect to the reverse power supply end of the oil pump;

[0113] an eighth resistor R8, a first end of which is used to connect to a power supply, and a second end of which is connected to the second input end;

[0114] a ninth resistor R9, a first end of which is electrically connected to the control chip 110, and a second end of which is connected to the second controlled end;

[0115] a tenth resistor R10, connected in series between the second output terminal and ground;

[0116] an eleventh resistor R11, connected in series between the second output terminal and the third controlled terminal,

[0117] The twelfth resistor R12 is connected in parallel to the third controlled end and the third output end.

[0118] In this embodiment, the second switch tube Q2 and the third switch tube Q3 may include MOS tubes, triodes, IGBTs, etc.

[0119] Taking the second switch tube Q2 and the third switch tube Q3 as an example, both of which are NPN-type triodes, when it is necessary to drive the oil pump to work, the control chip 110 outputs a high-level control signal to the second switch tube Q2, so that the second switch tube Q2 is turned on, and the power supply forms a current loop through the eighth resistor R8, the second switch tube Q2, and the tenth resistor R10 to the ground. At this time, the voltage across the tenth resistor R10 provides a high level for the controlled end of the third switch tube Q3, controls the third switch tube Q3 to be turned on, and the power supply of the oil pump (such as 12V in the figure) forms a power supply loop through the oil pump and the third switch tube Q3 to the ground, thereby driving the oil pump to work.

[0120] When the oil pump does not need to be driven, the control chip 110 outputs a low-level control signal to the second switch tube Q2, so that the second switch tube Q2 is turned off, and the power supply cannot flow through the tenth resistor R10. The third switch tube Q3 is turned off because the controlled end does not receive a high level, so that the power supply circuit of the oil pump is disconnected and the oil pump stops working.

[0121] In the utility model, the second switch tube Q2 is used to control whether the current of the power supply is turned on or not under the drive of the control chip 110. By turning on the current of the power supply, a large current drives the third switch tube Q3 to be turned on, thereby avoiding the situation where a single switch tube cannot drive the oil pump to work due to a large driving current of the oil pump.

[0122] Furthermore, the oil pollution detection processing circuit also includes a feedback circuit, and the feedback circuit includes:

[0123] a thirteenth resistor R13, a first end of which is electrically connected to the control chip 110, and a second end of which is connected to the feedback end of the oil pump;

[0124] The fourteenth resistor R14 has a first end for connecting to a power source, and a second end connected to the second end of the thirteenth resistor R13.

[0125] The feedback circuit is used to receive the feedback signal output by the oil pump and output it to the control chip 110, so that the control chip 110 controls the oil pump to continue working / stop working according to the feedback signal. When the working state of the oil pump is abnormal and the feedback end cannot normally output the corresponding feedback signal, the fourteenth resistor R14 pulls up the feedback end to a high level. At this time, the control chip 110 controls the oil pump drive circuit 140 to stop driving the oil pump to work.

[0126] like Figure 7 As shown, the utility model also proposes a kitchen air conditioner, which includes an oil box 200, an oil pump 300 and an oil stain detection and processing circuit. The oil pump 300 is arranged in the oil box 200 and is electrically connected to the oil stain detection and processing circuit. The specific structure of the oil stain detection and processing circuit refers to the above embodiment. Since the kitchen air conditioner adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0127] The above are only optional embodiments of the utility model, and do not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. An oil stain detection and processing circuit, applied to a kitchen air conditioner, the kitchen air conditioner comprises an oil pump and an oil box, characterized in that: The oil pollution detection processing circuit comprises: Control chip; A transceiver circuit, the output end of which is electrically connected to the control chip, and is used to detect the liquid level in the oil box by transmitting and receiving infrared rays, and output a status detection signal of a corresponding level; A trigger switch, used for shielding the infrared ray when the liquid level in the oil box reaches the warning liquid level, so that the transceiver circuit outputs a state detection signal of a first level; An oil pump driving circuit, wherein an input end of the oil pump driving circuit is electrically connected to the control chip, and an output end of the oil pump driving circuit is used to be electrically connected to the oil pump and is also used to drive the oil pump to pump out the oil in the oil box under the control of the control chip; The control chip is used to control the oil pump driving circuit to operate for a preset period of time when receiving the state detection signal of the first level.

2. The oil pollution detection processing circuit according to claim 1, characterized in that: The transceiver circuit includes a transmitting component and a receiving component; The transmitting assembly and the receiving assembly are arranged at a distance from each other on the top of the oil box and form a corresponding gap. The trigger switch is arranged inside the oil box and is arranged relative to the gap. When the liquid level in the oil box reaches the warning liquid level, the trigger switch is used to insert into the gap to block the infrared rays output by the transmitting component.

3. The oil pollution detection processing circuit according to claim 1, characterized in that: The transceiver circuit comprises: A transmitting circuit, wherein the input end of the transmitting circuit is used to connect to a power supply, the controlled end of the transmitting circuit is electrically connected to the control chip, and is also used to continuously transmit infrared rays under the drive of the control chip; A receiving circuit, wherein the input end of the receiving circuit is used to connect to the power supply, and is also used to output a corresponding liquid level detection voltage when the infrared ray is received / not received; The comparison circuit, the first input end of the transmitting circuit is used to access the reference voltage, the second input end of the transmitting circuit is connected to the output end of the receiving circuit, and is also used to output the first level state detection signal when the received liquid level detection voltage is lower than the reference voltage.

4. The oil pollution detection processing circuit according to claim 3, characterized in that: The transmitting circuit comprises: A first switch tube has a first input end, a first output end and a first controlled end, wherein the first output end is grounded; A first resistor, wherein a first end of the first resistor is used to connect to a power source; a transmitting tube, an anode of which is connected to the second end of the first resistor, and a cathode of which is connected to the first input end; A second resistor is connected in series between the first controlled end and the control chip; The third resistor is connected in parallel to the first output terminal and the first controlled terminal.

5. The oil pollution detection processing circuit according to claim 3, characterized in that: The receiving circuit comprises: a fourth resistor, wherein a first end of the fourth resistor is used to be connected to the power supply, and a second end of the fourth resistor is connected to the second input end of the comparison circuit; A receiving tube, wherein an anode of the receiving tube is connected to the second end of the fourth resistor, and a cathode of the receiving tube is grounded.

6. The oil pollution detection processing circuit according to claim 3, characterized in that: The comparison circuit comprises: A comparator, comprising a positive input terminal, a negative input terminal, an output terminal, a power supply terminal and a ground terminal, wherein the power supply terminal is used to connect to the power supply, the ground terminal is grounded, the positive input terminal is the first input terminal of the comparator circuit, and the negative input terminal is the second input terminal of the comparator circuit; A first capacitor connected in series between the power supply terminal and the ground; A fifth resistor is connected in series between the output terminal of the comparator and the control chip; A sixth resistor has a first end connected to the power supply and a second end connected to the output end of the comparator.

7. The oil pollution detection processing circuit according to claim 6, characterized in that: The comparison circuit further comprises: a seventh resistor, wherein a first end of the seventh resistor is used for connecting to the power supply; An indicator light, wherein an input end of the indicator light is connected to the second end of the seventh resistor, and an output end of the indicator light is connected to the output end of the comparator.

8. The oil pollution detection processing circuit according to claim 3, characterized in that: The oil pollution detection processing circuit also includes: A reference level generating circuit, wherein the input end of the reference level generating circuit is used to access the power supply, the output end of the reference level generating circuit is connected to the first input end of the comparison circuit, and the reference level generating circuit is used to perform voltage conversion processing on the power supply and output a corresponding reference voltage.

9. The oil pollution detection processing circuit according to claim 1, characterized in that: The oil pump driving circuit comprises: A second switch tube has a second input end, a second output end and a second controlled end; A third switch tube has a third input end, a third output end and a third controlled end, wherein the third input end is used to connect to the reverse power supply end of the oil pump; an eighth resistor, a first end of which is used to be connected to a power supply, and a second end of which is connected to the second input end; a ninth resistor, a first end of which is electrically connected to the control chip, and a second end of which is connected to the second controlled end; a tenth resistor, connected in series between the second output terminal and ground; an eleventh resistor connected in series between the second output terminal and the third controlled terminal, The twelfth resistor is connected in parallel to the third controlled end and the third output end.

10. A kitchen air conditioner, characterized in that: The kitchen air conditioner comprises an oil pump, an oil box and an oil stain detection and processing circuit as described in any one of claims 1 to 9, wherein the oil pump is arranged in the oil box and is electrically connected to the oil stain detection and processing circuit.

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