Oxygen sensor and household appliance

Abstract

The invention relates to the technical field of household appliances, and particularly discloses an oxygen sensor and a household appliance, an oxygen sensor body comprises a sensor shell, a detection element, a working electrode (WE) and a filter shell, the household appliance comprises an assembly shell sleeve, a bracket corresponding to the sensor shell is arranged in the assembly shell sleeve, and the sensor shell is arranged in the bracket. And storage batteries are mounted on the left and right sides in the assembly shell sleeve. According to the oxygen sensor and household appliance design provided by the invention, through improvement in the aspects of high-temperature adaptation, modular maintenance, effective protection measures, electrical performance optimization, cost effectiveness and the like, the problems of high process and material cost of an oxygen sensor in traditional automobile application are solved, and specific requirements in a household scene are met; the design improves the reliability and maintenance convenience of the sensor, also optimizes the cost and performance, and is significantly helpful for improving the functions of household electrical appliances and user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to an oxygen sensor and a household appliance. Background Art

[0002] An oxygen sensor is a device that measures the oxygen content in a gas. It is commonly found in automobile exhaust systems to optimize combustion and reduce emissions. When the oxygen sensor is in the engine, the high ambient temperature in the exhaust system can reach 700°C or even higher, and the automobile engine will generate a lot of vibration and impact when running. Therefore, the material and structure of the sensor must be able to withstand these extreme temperatures, and the sensor must be able to withstand these mechanical loads without failure of its fixed structure and sealing.

[0003] Oxygen sensors are also used in household appliances. For example, they are used to detect the oxygen content in the air in the ventilation system, optimize the operation of the ventilation system, and ensure the indoor air quality. Oxygen sensors can be used to detect changes in the concentration of oxygen in the air to indirectly infer the steam concentration (steam will replace part of the oxygen in the air in a high temperature environment, thereby reducing the oxygen concentration measured by the oxygen sensor. By monitoring this concentration change, the steam concentration can be inferred), thereby indirectly controlling the humidity during the cooking process to make the cooked food taste better.

[0004] Since the process and material costs of oxygen sensors in traditional automotive applications are relatively high, if they are directly applied to household appliances, not only will the cost be high but also the structure will be complex. Oxygen sensors with low vibration requirements and certain temperature resistance are more suitable for household scenarios. Therefore, the present invention proposes an oxygen sensor and a household appliance to solve the problems mentioned in the above background technology. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an oxygen sensor and a household appliance.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An oxygen sensor for household appliances, comprising an oxygen sensor body, wherein the oxygen sensor body comprises a sensor housing, a detection element, a working electrode (WE) and a filter housing;

[0008] The working electrode (WE) contacts oxygen, an electrochemical reaction occurs, and a change in current or voltage occurs. The working electrode (WE) is connected to a detection element, and the detection element further includes a data processing unit (MCU). The data processing unit (MCU) detects and records the change in current or voltage and converts the oxygen concentration into an electrical signal. An insulating sleeve is provided between the detection element and the inside of the sensor housing;

[0009] The detection element is connected to a power-on buckle block on both sides, and the outer side of the sensor housing is fixed with a contact block corresponding to the power-on buckle block on both sides, and the lower end of the sensor housing is provided with an opening corresponding to the power-on buckle block on both sides;

[0010] A filter shell is arranged at the upper end of the sensor housing, and a permeable membrane is arranged between the inside of the filter shell and the inside of the sensor housing. The permeable membrane is made of high temperature resistant material (such as ceramic), which can ensure that the membrane will not fail or change its air permeability at high temperature.

[0011] Preferably, the detection element also includes a counter electrode (CE) and a reference electrode, the counter electrode (CE) is used to provide a current exchange interface, working with the working electrode (WE) to maintain current flow, the reference electrode is used to provide a stable potential reference to measure the potential of the working electrode (WE), the detection element is connected to a connecting terminal, the connecting terminal includes a connecting head, and the connecting terminal is used for transmitting electrical signals of the sensor detection element.

[0012] Preferably, when the detection element is energized, a constant current source (IC) is generated, and the constant current source (IC) drives the working electrode (WE) to produce an electrochemical reaction. The constant current source (IC) provides a stable current, wherein the positive end of the constant current source (IC) is connected to the working electrode (WE), and the negative end is connected to the counter electrode (CE). A current detection resistor (R_sense) is connected between the counter electrode (CE) and the negative end of the constant current source (IC). The current detection resistor (R_sense) is used to detect the current flowing through the sensor, and an operational amplifier (OPAMP) is connected to both ends of the current detection resistor (R_sense). The operational amplifier (OPAMP) is used to amplify the voltage signal across the resistor. The amplified voltage signal is digitized by a digital converter (ADC) connected to the operational amplifier (OPAMP), and the digitized signal is transmitted through the connecting terminal.

[0013] Preferably, the power-carrying buckle block is an elastic power-carrying metal sheet, which is fixed by a corresponding opening on the sensor housing, and a power-carrying copper ring fixed on the shock block is provided between the shock block and the power-carrying buckle block, and a circular hole corresponding to the power-carrying copper ring is provided in the shock block, and power-carrying wires connected to the shock block are buried on the left and right sides of the outer side of the sensor housing, and the other end of the power-carrying wire is connected to a power connecting sheet.

[0014] Preferably, the upper end of the sensor housing is threadedly connected to the filter housing, the filter housing is provided with external threads, the upper end of the sensor housing is provided with corresponding internal threads, and a permeable membrane is provided between the inside of the filter housing and the inside of the sensor housing, the permeable membrane allows oxygen to penetrate into the sensor and react with the electrode.

[0015] A household appliance comprises an assembly shell, wherein a bracket corresponding to a sensor shell is arranged inside the assembly shell, and batteries are installed on the left and right sides of the assembly shell, and two contact plates on the sensor shell are respectively in contact with positive and negative electrodes of two assembled batteries.

[0016] Preferably, several layers of upper and lower shielding covers are arranged on the upper side of the assembly shell, the shielding covers gradually become larger from top to bottom, and an annular groove is provided on the outer edge of the shielding covers, several connecting blocks are connected between the upper and lower shielding covers, the connecting blocks are distributed at the four corners of the shielding covers, and drainage grooves corresponding to the annular grooves are provided on the outer sides of the connecting blocks, and a top cover fixed on the shielding cover is arranged on the upper side of the filter shell, and the equipment shell is made of high temperature resistant material (such as stainless steel), and the high temperature resistant assembly shell protects the good electrochemical properties of the electrodes inside the sensor shell and the integrity of the shell.

[0017] Preferably, the lower end of the assembly shell is provided with a water storage box, a circular opening corresponding to the lower end of the assembly shell is opened in the center of the water storage box, water inlets are opened at the four corners of the surface of the water storage box, the lower end of the connecting block is connected to the assembly strip, the lower end of the assembly strip is inserted into the water inlet on the surface of the water storage box, and a channel is set inside the assembly strip.

[0018] Preferably, a display component is provided at the lower end of the assembly shell, and the display component includes a component shell, a signal plug and a display screen. The component shell is threadedly connected to the assembly shell, the component shell is provided with an external thread, and the inner side of the lower end of the assembly shell is provided with a corresponding internal thread. The signal plug is connected to the connector of the connection terminal for signal transmission and translation, and the display screen is used to display the transmitted and translated oxygen concentration information.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention designs a new simple oxygen sensor structure, drives the electrochemical reaction through a constant current source, uses the counter electrode and the reference electrode to stabilize the potential, and uses the current detection resistor and the operational amplifier to accurately detect and amplify the signal. The signal is then digitized through a digital converter, ensuring the high accuracy and stability of the sensor, which helps to accurately measure the oxygen concentration and facilitates the subsequent processing and transmission of the signal.

[0021] 2. The sensor elements (such as working electrodes and detection elements) designed in the present invention can be replaced separately by disassembling the sensor housing, which reduces the cost and time of later maintenance. The design of the electric contact block and the energized copper ring makes it more convenient to replace the sensor elements. Users can complete the replacement without complicated operations. The display component provides oxygen concentration information, allowing users to view and monitor gas concentration in real time;

[0022] 3. The present invention uses a high temperature resistant permeable membrane (such as ceramic) and a high temperature resistant stainless steel assembly shell. These materials can withstand the high temperatures that may be reached in household appliances (such as the high temperatures during cooking), ensuring that the sensor maintains stability and good performance under high temperature conditions, and can prevent the sensor from failing or performance degradation under high temperatures, which is particularly important for household appliances that are used for a long time;

[0023] 4. The layered design of the shielding cover of the present invention can effectively shield and guide the condensed steam to prevent it from directly impacting the sensor. It also collects and discharges condensed water through the annular groove and the drainage groove to protect the sensor from moisture and water vapor. The water storage box is designed to collect condensed water to avoid the influence of moisture on the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the assembly structure of an oxygen sensor proposed by the present invention;

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of an oxygen sensor provided by the present invention;

[0026] Figure 3 This is a schematic cross-sectional view of an oxygen sensor proposed by the present invention;

[0027] Figure 4 A schematic diagram of a side cross-sectional structure of an oxygen sensor proposed by the present invention;

[0028] Figure 5 A schematic structural diagram of a shielding cover in a household appliance assembly component proposed by the present invention;

[0029] Figure 6 This is a schematic diagram of the front assembly cross-sectional structure of an oxygen sensor and a household appliance proposed by the present invention;

[0030] Figure 7 A schematic diagram of the connection structure of a display component in a household appliance proposed by the present invention;

[0031] Figure 8 This is a schematic diagram of the circuit design principle of an oxygen sensor proposed by the present invention.

[0032] In the figure:

[0033] 1. Oxygen sensor body; 101. Sensor housing; 102. Detection element; 103. Filter housing; 104. Connection terminal; 105. Working electrode; 106. Insulation sleeve; 107. Electric contact block; 108. Connector; 109. Power-carrying copper ring; 110. Power-carrying buckle block; 111. Permeable membrane;

[0034] 2. Assemble the shell; 3. Water storage box;

[0035] 4. Display component; 401. Display screen; 402. Signal plug;

[0036] 5. shielding cover; 501. annular groove; 502. connecting block; 503. drainage groove;

[0037] 6. Assemble the inserts; 7. Top cover; 8. Battery. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] Reference Figure 1-8 An oxygen sensor for household appliances includes an oxygen sensor body 1, the oxygen sensor body 1 includes a sensor housing 101, a detection element 102, a working electrode 105 (WE) and a filter housing 103, air passes through the gas filter housing 103, enters the sensor, and generates an electrochemical reaction with the electrode in the sensor element, the sensor element conducts the current or voltage signal generated in the electrochemical reaction to an external circuit, and the housing protects the internal components;

[0040] Furthermore, referring to Figure 3 , 4 The working electrode 105 (WE) contacts with oxygen, an electrochemical reaction occurs, and a change in current or voltage occurs. The working electrode 105 is connected to the detection element 102. The detection element 102 also includes a data processing unit (MCU). The data processing unit (MCU) detects and records the change in current or voltage and converts the oxygen concentration into an electrical signal. An insulating sleeve 106 is provided between the detection element 102 and the inside of the sensor housing 101. The detection element 102 also includes a counter electrode (CE) and a reference electrode. The counter electrode (CE) is used to provide a current exchange interface and works with the working electrode 105 (WE) to keep the current flowing. The reference electrode is used to provide a stable potential reference to measure the potential of the working electrode 105 (WE). The detection element 102 is connected to a connection terminal 104. The connection terminal 104 includes a connector 108. The connection terminal 104 is used for transmitting electrical signals of the sensor detection element 102.

[0041] Furthermore, referring to Figure 8, when the detection element 102 is powered on, a constant current source (IC) is generated, and the constant current source (IC) drives the working electrode 105 (WE) to generate an electrochemical reaction, and the constant current source (IC) provides a stable current, wherein the positive end of the constant current source (IC) is connected to the working electrode 105 (WE), and the negative end is connected to the counter electrode (CE), and a current detection resistor (R_sense) is connected between the counter electrode (CE) and the negative end of the constant current source (IC) to detect the current flowing through the sensor, and the current detection resistor (R_sense) is used to detect the current flowing through the sensor, and an operational amplifier (OPAMP) is connected to both ends of the current detection resistor (R_sense), and the non-inverting input (+) of the operational amplifier (OPAMP) is connected to one end of the current detection resistor (R_sense), and the inverting input (-) is connected to the other end of the current detection resistor (R_sense), and the operational amplifier (OPAMP) is used to amplify the voltage signal across the resistor, and the amplified voltage signal is digitized by a digital converter (ADC) connected to the operational amplifier (OPAMP), and the digitized signal is transmitted through the connection terminal 104;

[0042] Furthermore, referring to Figure 3 , 4 , the detection element 102 is connected to the left and right sides of the power-carrying buckle block 110, and the left and right sides of the outer side of the sensor housing 101 are fixed with the power-conducting buckle block 110 corresponding to the power-conducting buckle block 110, and the left and right sides of the lower end of the sensor housing 101 are opened with openings corresponding to the power-conducting buckle block 110, the power-conducting buckle block 110 is an elastic power-conducting metal sheet, the power-conducting buckle block 110 is fixed through the corresponding opening on the sensor housing 101, and a power-conducting copper ring 109 fixed on the power-conducting buckle block 107 is arranged between the power-conducting buckle block 110, and a round hole corresponding to the power-conducting copper ring 109 is opened in the power-conducting block 107, and the outer side of the sensor housing 101 Power-carrying wires connected to the contact blocks 107 are buried on both sides, and the other end of the power-carrying wires is connected to a power contact sheet. The detection element 102 and the connected working electrode 105 (WE) are a complete sensor element, which can be replaced separately by disassembling the sensor housing 101, saving the later maintenance cost. The specific operation is to squeeze the power-carrying buckle blocks 110 on both sides of the detection element 102 through the round holes on the contact blocks 107 and the power-carrying copper rings 109, so that the power-carrying buckle blocks 110 on both sides withdraw from the corresponding openings, and then the detection element 102 can be easily taken out from the inside of the sensor housing 101;

[0043] Furthermore, referring to Figure 4The upper end of the sensor housing 101 is provided with a filter housing 103, and a permeable membrane 111 is provided between the inside of the filter housing 103 and the inside of the sensor housing 101. The permeable membrane 111 needs to maintain stability and air permeability at high temperatures. The permeable membrane 111 is made of a high-temperature resistant material (such as ceramic). In order to meet the temperature requirements of up to 250 degrees Celsius under cooking conditions, it is necessary to select a material for the permeable membrane 111 with a certain temperature resistance to ensure that the membrane will not fail or change its air permeability at high temperatures. The upper end of the sensor housing 101 is threadedly connected to the filter housing 103, and the filter housing 103 is provided with an external thread, and the upper end of the sensor housing 101 is provided with a corresponding internal thread, and the inside of the filter housing 103 is connected to the sensor housing 101. A permeable membrane 111 is arranged inside the housing 101 of the sensor. The permeable membrane 111 allows oxygen to penetrate into the sensor to react with the electrode and is guided to the working electrode 105 (WE) for reaction while avoiding interference from other irrelevant gases and pollutants. The basic design principle of this oxygen sensor is to measure the concentration of gas through electrochemical reaction. The sensor element includes electrodes and necessary chemicals. The electrodes are responsible for the electrochemical reaction. The permeable membrane 111 selectively allows the target gas to enter the sensor, while the housing provides protection and structural support for the sensor. The entire system converts the gas concentration into an electrical signal through an electrochemical reaction, thereby realizing accurate measurement of the gas concentration.

[0044] Reference Figure 1 , 2 A household appliance, which may be an oven, an induction cooker, a baking tray or an air fryer, etc., comprises an assembly shell 2, wherein a bracket corresponding to a sensor shell 101 is arranged inside the assembly shell 2, and batteries 8 are installed on the left and right sides of the assembly shell 2, and two contact plates on the sensor shell 101 are respectively in contact with the positive and negative electrodes of the two combined batteries 8, and the batteries 8 inside the sensor shell 101 provide power support for the oxygen sensor body 1 assembled inside, and a display component 4 is arranged at the lower end of the assembly shell 2, and the display component 4 comprises a component shell, a signal plug 402 and a display screen 401, and the component shell is threadedly connected to the assembly shell 2, and an external thread is arranged on the component shell , and the lower end of the assembly shell 2 is provided with a corresponding internal thread, the signal plug 402 is connected to the connector 108 of the connection terminal 104 for signal transmission and translation, and the display screen 401 is used to display the oxygen concentration information of the transmission and translation. The specific assembly operation is to install the oxygen sensor body 1 from the assembly shell 2 into the internal bracket until it is completely inserted into the bracket, and the left and right contact pieces of the sensor housing 101 are in contact with the positive and negative electrodes of the battery 8, so that the oxygen sensor body 1 is powered on and works normally, and the housing of the display assembly 4 is screwed to the lower end of the assembly shell 2, and the signal plug 402 is connected to the connector 108, and the oxygen concentration change information is displayed on the display screen 401;

[0045] Furthermore, referring to Figure 5 , 6, the upper side of the assembly shell 2 is provided with a plurality of upper and lower layers of shielding covers 5, the plurality of shielding covers 5 are gradually enlarged from top to bottom, and an annular groove 501 is provided on the outer edge of the shielding covers 5, a plurality of connecting blocks 502 are connected between the upper and lower shielding covers 5, the plurality of connecting blocks 502 are distributed at the four corners of the shielding covers 5, and a drainage groove 503 corresponding to the annular groove 501 is provided on the outer side of the connecting block 502, and a top cover 7 fixed on the shielding cover 5 is provided on the upper side of the filter housing 103, the assembly shell 2 is made of high temperature resistant material (such as stainless steel), and the high temperature resistant assembly shell 2 protects the good electrochemical performance of the electrodes inside the sensor housing 101, as well as the integrity of the sensor housing 101, and the lower end of the assembly shell 2 A water storage box 3 is provided, a circular opening corresponding to the lower end of the assembly shell 2 is provided in the center of the water storage box 3, water inlets are provided at the four corners of the surface of the water storage box 3, an assembly plug 6 is connected to the lower end of the connection block 502, the lower end of the assembly plug 6 is inserted into the water inlet on the surface of the water storage box 3, and a channel is provided inside the assembly plug 6. After the oxygen sensor body 1 is assembled into the assembly shell 2, the assembly shell 2 is made of high-temperature resistant stainless steel material, which can provide a certain heat insulation function for the internal oxygen sensor, provide a basis for the electrode material to maintain good electrochemical properties, and prevent the electronic components (such as resistors and capacitors) in the circuit from failing at high temperatures, while preventing the shell material from deforming or degrading under high temperature environment;

[0046] Furthermore, the shielding cover 5 structure is provided to prevent steam from directly rushing into the interior of the oxygen sensor through the filter housing 103. The shielding cover 5 can also collect and shield the condensed steam. The steam water passes through the annular groove 501 on the outer periphery of the shielding cover 5 and is discharged downward through the drainage groove 503 on the outer side of the connecting block 502, and enters the assembled water storage box 3 through the internal channel of the assembly plug 6 to collect the condensed water. Before assembling the above-mentioned display component 4, the water storage box 3 must be sleeved on the lower end of the assembly shell 2, and then the display component 4 is selected. The display component 4 squeezes the upper water storage box 3 and cooperates with the upper assembly shell 2 of the water storage box 3 to complete the stabilization of the middle water storage box 3. The above-mentioned household appliance assembly shell 2 structure adapted for oxygen sensors can provide a certain degree of temperature resistance protection for the oxygen sensor, and at the same time is convenient for disassembly and replacement of the internal oxygen sensor at any time, saving time for subsequent maintenance.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An oxygen sensor for household appliances, characterized in that: The oxygen sensor body 1 includes a sensor housing 101, a detection element 102, a working electrode 105 and a filter housing 103; The working electrode 105 contacts oxygen, generates an electrochemical reaction, and generates a change in current or voltage. The working electrode 105 is connected to the detection element 102. The detection element 102 also includes a data processing unit. The data processing unit detects and records the change in current or voltage and converts the oxygen concentration into an electrical signal. An insulating sleeve 106 is provided between the detection element 102 and the inside of the sensor housing 101. The detection element 102 is connected to the power-on buckle block 110 on both sides, and the outer side of the sensor housing 101 is fixed with a contact block 107 corresponding to the power-on buckle block 110 on both sides, and the lower end of the sensor housing 101 is opened on both sides corresponding to the power-on buckle block 110; A filter housing 103 is disposed at the upper end of the sensor housing 101 , and a permeable membrane 111 is disposed between the interior of the filter housing 103 and the interior of the sensor housing 101 .

2. The oxygen sensor according to claim 1, characterized in that The detection element 102 also includes a counter electrode and a reference electrode. The counter electrode is used to provide a current exchange interface, and the reference electrode is used to provide a stable potential reference. The detection element 102 is connected to a connection terminal 104, and the connection terminal 104 includes a connector 108. The connection terminal 104 is used for transmitting electrical signals of the sensor detection element 102.

3. The oxygen sensor according to claim 1, characterized in that When the detection element 102 is powered on, a constant current source is generated, and the constant current source drives the working electrode 105 to produce an electrochemical reaction. The constant current source provides a stable current, wherein the positive end of the constant current source is connected to the working electrode 105, and the negative end is connected to the counter electrode. A current detection resistor is connected between the counter electrode and the negative end of the constant current source. The current detection resistor is used to detect the current flowing through the sensor. An operational amplifier is connected to both ends of the current detection resistor. The operational amplifier is used to amplify the voltage signal across the resistor. The amplified voltage signal is digitized by a digital converter connected to the operational amplifier, and the digitized signal is transmitted through the connection terminal 104.

4. The oxygen sensor according to claim 1, characterized in that The power-carrying buckle block 110 is an elastic power-carrying metal sheet, which is fixed through a corresponding opening on the sensor housing 101, and a power-carrying copper ring 109 fixed on the power-carrying block 107 is provided between the contact block 107 and the power-carrying buckle block 110, and a circular hole corresponding to the power-carrying copper ring 109 is provided in the contact block 107, and power-carrying wires connected to the contact block 107 are buried on the left and right sides of the outer side of the sensor housing 101, and the other end of the power-carrying wire is connected to a power connecting sheet.

5. The oxygen sensor according to claim 1, characterized in that The upper end of the sensor housing 101 is threadedly connected to the filter housing 103 , and a permeable membrane 111 is disposed between the interior of the filter housing 103 and the interior of the sensor housing 101 . The permeable membrane 111 allows oxygen to penetrate into the interior of the sensor to react with the electrode.

6. A household appliance, comprising the oxygen sensor according to any one of claims 1 to 5, characterized in that: It also includes an assembly shell 2, wherein a bracket corresponding to the sensor housing 101 is arranged inside the assembly shell 2, and batteries 8 are installed on the left and right sides of the assembly shell 2, and two contact plates on the sensor housing 101 are in contact with the positive and negative electrodes of the two assembled batteries 8 respectively.

7. The household appliance according to claim 6, characterized in that: A plurality of upper and lower shielding covers 5 are arranged on the upper side of the assembly shell 2. The shielding covers 5 gradually become larger from top to bottom, and an annular groove 501 is provided on the outer edge of the shielding covers 5. A plurality of connecting blocks 502 are connected between the upper and lower shielding covers 5. The connecting blocks 502 are distributed at the four corners of the shielding covers 5, and drainage grooves 503 corresponding to the annular grooves 501 are provided on the outer sides of the connecting blocks 502. A top cover 7 fixed on the shielding cover 5 is arranged on the upper side of the filter shell 103.

8. The household appliance according to claim 6, characterized in that: The lower end of the assembly shell 2 is provided with a water storage box 3, and a circular opening corresponding to the lower end of the assembly shell 2 is opened in the center of the water storage box 3, and water inlets are opened at the four corners of the surface of the water storage box 3. The lower end of the connecting block 502 is connected to the assembly plug 6, and the lower end of the assembly plug 6 is inserted into the water inlet on the surface of the water storage box 3, and a channel is set inside the assembly plug 6.

9. The household appliance according to claim 6, characterized in that: A display component 4 is provided at the lower end of the assembly shell 2. The display component 4 includes a component shell, a signal plug 402 and a display screen 401. The component shell is threadedly connected to the assembly shell 2. The signal plug 402 is connected to the connector 108 of the connection terminal 104 for signal transmission and translation. The display screen 401 is used to display the transmitted and translated oxygen concentration information.

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