Photocatalytic odor-removing device and refrigerator

Abstract

The embodiment of the present application relates to a kind of photocatalytic odor purification device and refrigerator, the device includes: purification module, air inlet, air outlet, fan, ultraviolet lamp assembly, ventilation cavity and controller, purification module includes purification medium attachment unit and motor module, purification medium attachment unit includes the adsorption material with photocatalyst immobilized;Controller is electrically connected with motor module;Purification medium attachment unit is fixed on motor module, motor module is arranged on the first side wall of ventilation cavity, and purification medium attachment unit is located in ventilation cavity;Ultraviolet lamp assembly is arranged on the second side wall of ventilation cavity.The embodiment of the present application realizes that ultraviolet light can be irradiated to each position of purification medium, and centrifugal force in rotation process is advantageous to decompose some deposits, and separate photocatalyst active site, to improve purification effect.

Description

Technical Field

[0001] This application relates to the field of smart home appliance technology, and in particular to a photocatalytic deodorizing device and a refrigerator. Background Technology

[0002] Refrigerators have become an essential household appliance for every family. In actual use, various kinds of food are usually mixed together in the refrigerator compartment, which can lead to cross-contamination of odors between different foods. Furthermore, food left for a long time can produce odorous gases such as methanethiol, hydrogen sulfide, acetaldehyde, and xylene.

[0003] Therefore, some refrigerators are equipped with deodorizing devices to sterilize and remove odors from the air inside. Photocatalysis is a technology that uses light energy to drive chemical reactions, typically using specific semiconductor materials (such as titanium dioxide, TiO2) as catalysts. Under light irradiation, the photocatalyst absorbs light energy, generating electron-hole pairs, which react with oxygen and water to produce superoxide radicals and hydroxyl radicals. These radicals, together with the holes, decompose odorous substances in the gas.

[0004] Since odor-causing substances exist in the air, adsorption followed by decomposition can efficiently remove them. However, current photocatalytic odor decomposition technologies still have some limitations. For example, the irradiation range of ultraviolet light is limited; only photocatalysts exposed to ultraviolet light can react. Increasing the number of ultraviolet light sources to improve the photocatalytic reaction rate leads to faster material heating and increased desorption of adsorbates. Secondly, deposits can form during the reaction, occupying active sites and reducing photocatalytic efficiency. Furthermore, the photocatalytic coating being covered by other substances (such as dust) or the carrier pores being blocked by foreign objects can prevent the photocatalyst from fully contacting the substrate and reacting, while also blocking light from reaching the photocatalyst, ultimately leading to photocatalytic failure. Utility Model Content

[0005] In view of this, in order to solve some or all of the above-mentioned technical problems, this application provides a photocatalytic deodorizing device and a refrigerator.

[0006] In a first aspect, embodiments of this application provide a photocatalytic odor removal device, which includes: a purification module, an air inlet, an air outlet, a fan, an ultraviolet lamp assembly, a ventilation cavity, and a controller. The purification module includes a purification medium attachment unit and a motor module. The purification medium attachment unit includes an adsorbent material immobilized with a photocatalyst. The controller is electrically connected to the motor module. The purification medium attachment unit is fixed on the motor module, and the motor module is disposed on the first side wall of the ventilation cavity. The purification medium attachment unit is located inside the ventilation cavity. The ultraviolet lamp assembly is disposed on the second side wall of the ventilation cavity.

[0007] In one possible implementation, the number of purification modules is at least two. The ventilation cavity includes an airflow barrier wall, and the airflow barrier wall is provided with a vent. The airflow direction of the ventilation cavity is from the vent to the air outlet. The purification medium attachment unit included in each purification module is arranged in the ventilation cavity in sequence according to the airflow direction. The ventilation cavity is connected to the air intake space inside the photocatalytic deodorizing device through the vent. The air intake space is the space inside the photocatalytic deodorizing device other than the ventilation cavity. The fan and the air inlet are arranged on the side wall of the air intake space.

[0008] In one possible implementation, the photocatalytic odor removal device further includes a first gas concentration detector, which is electrically connected to the controller and is located outside the ventilation cavity.

[0009] In one possible implementation, the photocatalytic odor removal device further includes a second gas concentration detector, which is electrically connected to the controller and is disposed inside the ventilation cavity.

[0010] In one possible implementation, the motor module includes a rotating motor, a rotating bearing, and a rotating structure. The rotating motor is connected to the rotating structure via the rotating bearing, and the purification medium attachment unit is detachably fixed to the rotating structure via mounting components on the rotating structure.

[0011] Secondly, embodiments of this application provide a refrigerator, including: a photocatalytic deodorizing device as described in the first aspect above.

[0012] The photocatalytic deodorizing device and refrigerator provided in this application embodiment include a purification module, an air inlet, an air outlet, a fan, an ultraviolet lamp assembly, a ventilation cavity, and a controller. The purification module includes a purification medium attachment unit and a motor module. The purification medium attachment unit includes an adsorbent material immobilized with a photocatalyst and is fixed to the motor module, which is located on the first side wall of the ventilation cavity. The ultraviolet lamp assembly is located on the second side wall of the ventilation cavity. The controller controls the rotation of the motor module. The fan draws air from outside the photocatalytic deodorizing device into the ventilation cavity. Under the action of the ultraviolet lamp and the photocatalyst, the drawn-in air is purified, and the purified air is discharged from the photocatalytic deodorizing device. This application embodiment achieves improved purification effect by rotating the purification medium attachment unit, allowing ultraviolet light to irradiate all parts of the purification medium. Simultaneously, the centrifugal force during rotation helps decompose some deposits, removing them from the active sites of the photocatalyst. In addition, by rapidly rotating the purification medium attachment unit in conjunction with a fan, dust and other foreign objects on the purification medium can be effectively removed, improving the purification effect and extending the service life of the purification medium attachment unit. Attached Figure Description

[0013] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0016] Figure 1 This is a schematic diagram of the structure of a photocatalytic odor removal device provided in an embodiment of this application;

[0017] Figure 2 This is a top view of the photocatalytic odor removal device provided in the embodiments of this application;

[0018] Figure 3 This is a schematic diagram of another photocatalytic odor removal device provided in the embodiments of this application;

[0019] Figure 4 This is a schematic diagram of the structure of the motor module provided in the embodiments of this application;

[0020] Figure 5 This is a schematic diagram of the structure of a refrigerator provided in an embodiment of this application.

[0021] Figure label:

[0022] 100-Photocatalytic odor removal device; 101-Purification module; 1011-Purification medium attachment unit; 1012-Motor module; 10121-Rotating motor; 10122-Rotating bearing; 10123-Rotating structure; 10124-Mounting components; 102-Air inlet; 103-Air outlet; 104-Fan; 105-UV lamp assembly; 106-Ventilation chamber; 1061-Airflow barrier wall; 1062-Ventilation opening; 107-Controller; 108-First gas concentration detector; 109-Second gas concentration detector; 500-Refrigerator. Detailed Implementation

[0023] Various exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application.

[0024] Those skilled in the art will understand that the terms "first" and "second" in the embodiments of this application are only used to distinguish different steps, devices or modules, and do not represent any specific technical meaning, nor do they indicate the logical order between them.

[0025] It should also be understood that in this embodiment, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0026] It should also be understood that any component, data or structure mentioned in the embodiments of this application can generally be understood as one or more unless explicitly defined or given contrary guidance in the context.

[0027] Furthermore, the term "and / or" in this application is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "or" relationship.

[0028] It should also be understood that the description of the various embodiments in this application emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0029] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0030] Techniques, devices, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, devices, and equipment should be considered part of the specification.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. To facilitate understanding of the embodiments of this application, the application will be described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] Figure 1 This is a schematic diagram of a photocatalytic deodorizing device 100 provided in an embodiment of this application. This photocatalytic deodorizing device 100 is typically used in refrigerators. Specifically, the photocatalytic deodorizing device 100 includes: a purification module 101, an air inlet 102, an air outlet 103, a fan 104, an ultraviolet lamp assembly 105, a ventilation cavity 106, and a controller 107. The purification module includes a purification medium attachment unit 1011 and a motor module 1012. The purification medium attachment unit 1011 includes an adsorbent material immobilized with a photocatalyst. Typically, the photocatalyst can be a semiconductor such as titanium dioxide, with a particle size usually below 100 nm.

[0034] Optionally, activated carbon can be selected as the adsorbent material. Activated carbon has numerous honeycomb-like pores, which helps to expand the working area of ​​the photocatalyst and facilitates air diffusion and flow, thereby improving the purification effect. The controller 107 is electrically connected to the motor module 1012. The controller 107 can be various types of electronic devices with logic processing capabilities, such as MCU (Microcontroller Unit) or FPGA (Field Programmable Gate Array). The controller 107 can control the start, stop, speed, and running time of the motor module 1012. The controller 107 can be installed inside or outside the housing of the photocatalytic odor removal device. Figure 1 The controller 107 shown is housed within the casing of the photocatalytic deodorizing device. Optionally, when the photocatalytic deodorizing device is used in a refrigerator, the controller 107 can be the refrigerator's controller, capable of simultaneously controlling the photocatalytic deodorizing device and other components within the refrigerator.

[0035] The purification medium attachment unit 1011 is fixed on the motor module 1012, the motor module 1012 is set on the first side wall of the ventilation cavity 106, and the purification medium attachment unit 1011 is located inside the ventilation cavity 106; the ultraviolet lamp assembly 105 is set on the second side wall of the ventilation cavity 106, and the air outlet 103 can be set on the second side wall or the first side wall. The position of the air outlet 103 needs to be such that the air in the ventilation cavity flows through the purification module 101 and then flows out from the air outlet 103.

[0036] The aforementioned ventilation cavity 106 consists of the outer shell of the photocatalytic odor removal device and internal baffles and other components. When the photocatalytic odor removal device is running, the rotation of the fan 104 draws outside air into the device through the air inlet 102, and then the air flows into the ventilation cavity 106 and out of the ventilation cavity from the air outlet 103. Figure 1 As shown, the baffles and sidewalls inside the photocatalytic odor removal device form a ventilation cavity 106. Ultraviolet lamps are mounted on two opposite sidewalls (i.e., the second sidewalls) of the ventilation cavity 106, and the purification module 101 is installed on the other pair of sidewalls (i.e., the first sidewalls). Figure 2 As shown, it displays a top view of the photocatalytic odor removal device. Figure 2 The arrows in the diagram indicate the direction of airflow.

[0037] A photocatalyst adhering unit 1011 is installed inside the ventilation cavity 106. Under ultraviolet light irradiation, the photocatalyst on the unit purifies various odorous gases, and the purified air is then discharged outside the device through the air outlet 103. At the same time, driven by the motor module 1012, the photocatalyst adhering unit 1011 rotates, allowing ultraviolet light to irradiate the unit 1011 without blind spots, thus improving purification efficiency.

[0038] The ultraviolet lamp in the ultraviolet lamp assembly 105 can be a mercury lamp or an LED lamp, etc. Mercury lamps have high energy output, while LED lamps have advantages such as energy saving and long lifespan. Different application scenarios can select the appropriate type of ultraviolet lamp according to requirements (such as cost, usage environment, etc.). Different types of ultraviolet lamps have different ultraviolet light wavelengths. Typically, the ultraviolet wavelength is between 265nm and 385nm. Targeted selection of ultraviolet lamp type can ensure that ultraviolet light is effectively absorbed by the photocatalyst, exciting the electron transition of the photocatalyst, initiating the photocatalytic reaction, and improving the decomposition efficiency of odor gas molecules.

[0039] Optionally, to ensure sufficient airflow within the photocatalytic odor removal device, the aforementioned fan 104 can be positioned at a corner of the bottom of the device. When the fan 104 rotates, the side walls of the photocatalytic odor removal device form air ducts, reducing dead zones in the internal airflow.

[0040] The photocatalytic odor removal device provided in this application embodiment comprises a purification module, an air inlet, an air outlet, a fan, an ultraviolet lamp assembly, a ventilation cavity, and a controller. The purification module includes a purification medium attachment unit and a motor module. The purification medium attachment unit includes an adsorbent material immobilized with a photocatalyst and is fixed to the motor module, which is mounted on the side wall of the ventilation cavity. The purification medium attachment unit is located within the ventilation cavity, and the ultraviolet lamp assembly is also mounted on the side wall of the ventilation cavity. The controller controls the rotation of the motor module, and the fan draws air from outside the photocatalytic odor removal device into the ventilation cavity. Under the action of the ultraviolet lamp and the photocatalyst, the drawn-in air is purified, and the purified air is discharged from the photocatalytic odor removal device. This application embodiment achieves improved purification efficiency by rotating the purification medium attachment unit, allowing ultraviolet light to irradiate all parts of the purification medium. Simultaneously, the centrifugal force during rotation helps decompose some deposits, removing them from the active sites of the photocatalyst. In addition, by rapidly rotating the purification medium attachment unit in conjunction with a fan, dust and other foreign objects on the purification medium can be effectively removed, improving the purification effect and extending the service life of the purification medium attachment unit.

[0041] In some optional implementations of this embodiment, such as Figure 1 As shown, the number of purification modules 101 is at least two, and the ventilation cavity 106 includes an airflow barrier wall 1061. (As...) Figure 2 As shown, a vent 1062 is provided on the partition wall of the airflow group. The airflow direction of the ventilation cavity is from the vent 1062 to the air outlet 103. The purification medium attachment unit included in each purification module is arranged in the ventilation cavity 106 in sequence according to the airflow direction of the ventilation cavity 106.

[0042] The ventilation chamber is connected to the air intake space inside the photocatalytic odor removal device via a ventilation opening. The air intake space refers to all spaces inside the photocatalytic odor removal device except for the ventilation chamber; the fan and air inlet are located on the side wall of this air intake space. Figure 1 and Figure 2 As shown, the space where the fan is located is the air intake space. Inside the outer shell of the photocatalytic deodorizing device, all spaces except the ventilation chamber belong to the air intake space. After the air to be purified enters the air intake space through the air inlet, it can only flow into the ventilation chamber 106 through the ventilation opening 1062.

[0043] like Figure 1 As shown, there are two purification modules 101. When the fan 104 is running, the air inside the photocatalytic deodorizing device flows into the ventilation chamber through the vent 1062. The airflow barrier wall 1061 can be a separate structure or one of the side walls of the ventilation chamber. Figure 1 As shown, the sidewall of 101, which supports the purification module, can serve as an airflow barrier wall 1061. Figure 2 As shown, when the gas flows within the ventilation cavity 106, it passes sequentially through the purification medium attachment unit 1011 included in each purification module 101. Each purification medium attachment unit 1011 rotates under the drive of its corresponding motor module 1012, more thoroughly purifying the odorous gas and further improving the purification effect.

[0044] In some optional implementations of this embodiment, such as Figure 3 As shown, the photocatalytic odor removal device also includes a first gas concentration detector 108, which is electrically connected to the controller 107 and is located outside the ventilation cavity 106.

[0045] The first gas concentration detector 108 is used to detect the concentration of odorous gases outside the ventilation cavity 106. The controller 107 can control the operating status of each component in the photocatalytic deodorizing device based on the first odorous gas concentration value detected by the first gas concentration detector 108. The first gas concentration detector 108 can be installed inside the space formed by the outer shell of the photocatalytic deodorizing device (e.g., inside the air intake space described in the above embodiment) or outside the space. The first gas concentration detector 108 can detect the concentration of odorous gases in the air before purification in real time. As an example, if the photocatalytic deodorizing device is applied in a refrigerator, the first gas concentration detector 108 can be installed at a certain location in the refrigerator compartment to detect the concentration of odorous gases in the refrigerator compartment in real time.

[0046] The first gas concentration detector 108 can sense the concentration of odorous gas and send a concentration signal to the controller 107. The controller 107 can adjust the state of each component of the photocatalytic odor removal device according to the concentration signal. For example, the higher the concentration of odorous gas, the faster the speed of the motor module 1012 can be, and the higher the operating power of the fan 104 can be, thereby improving the purification effect. In addition, a higher concentration of odorous gas can also increase the luminous intensity of the ultraviolet lamp, further improving the purification effect.

[0047] In this embodiment, by setting a first gas concentration detector 108 outside the ventilation cavity 106, the purified air can be detected. Based on the detected odor gas concentration, the operating status of each component in the photocatalytic odor removal device can be controlled in a targeted manner, thereby decomposing the odor gas more efficiently and improving the purification efficiency.

[0048] In some optional implementations of this embodiment, such as Figure 3 As shown, the photocatalytic odor removal device also includes a second gas concentration detector 109, which is electrically connected to the controller 107 and is disposed in the ventilation cavity 106.

[0049] like Figure 3 As shown, the second gas concentration detector 109 can be set in the ventilation cavity 106 near the air outlet 103 to detect the concentration of odor gas in the purified air.

[0050] The controller 107 can control the operating status of each component in the photocatalytic odor removal device by combining the odor gas concentrations detected by the second gas concentration detector 109 and the first gas concentration detector 108 respectively. As an example, the controller 107 can calculate the ratio of the odor gas concentration value detected by the second gas concentration detector 109 to the odor gas concentration value detected by the first gas concentration detector 108. Based on the ratio, the photocatalytic effect can be determined, and then the rotation speed of the motor module 1012, the operating power of the fan 104, and the light intensity of the ultraviolet lamp can be adjusted accordingly.

[0051] For example, the higher the ratio mentioned above, the higher the proportion of unabsorbed odor gas to the total amount of odor gas before purification, which means the purification efficiency is lower. In this case, the speed of the motor module 1012 can be increased, the operating power of the fan 104 can be increased, and the luminous intensity of the ultraviolet lamp can be increased to improve the purification efficiency.

[0052] In this embodiment, by setting a second gas concentration detector 109 inside the photocatalytic odor removal device, the concentration of odor gases in the air outside the photocatalytic odor removal device can be detected in real time. Combined with the concentration of odor gases in the air inside the photocatalytic odor removal device detected by the first gas concentration detector 108, the state of each component can be adjusted more specifically, thereby purifying odor gases more effectively.

[0053] In some optional implementations of this embodiment, such as Figure 4 As shown, the motor module 1012 includes a rotating motor 10121, a rotating bearing 10122, and a rotating structure 10123. The rotating motor 10121 is connected to the rotating structure 10123 through the rotating bearing 10122. The purification medium attachment unit 1011 is detachably fixed to the rotating structure 10123 through the mounting component 10124 on the rotating structure 10123.

[0054] The rotating motor 10121 drives the rotating structure 10123 to rotate via the rotating bearing 10122, and the rotating structure 10123 in turn drives the purification medium attachment unit 1011 to rotate. The mounting assembly 10124 can be any structure that allows the purification medium attachment unit 1011 to be mounted on or removed from the rotating structure 10123. For example, the mounting assembly 10124 can be a snap-fit ​​assembly or a threaded structure, etc.

[0055] When the aforementioned mounting assembly 10124 is in the locked state, it can fix the purification medium attachment unit 1011 onto the rotating structure 10123. When it is in the released state, the purification medium attachment unit 1011 can be removed.

[0056] This embodiment, by setting the rotating structure 10123 and the mounting component 10124, makes it easier to install and disassemble the purification medium attachment unit 1011, facilitates the replacement of the purification medium attachment unit 1011, and improves the ease of use.

[0057] Figure 5 This is a schematic diagram of the structure of a refrigerator 500 provided in an embodiment of this application, as shown below. Figure 5 As shown, the refrigerator includes the aforementioned photocatalytic deodorizing device 100. The photocatalytic deodorizing device 100 is typically located at the top of the refrigerator's freezer compartment. A fan 104 within the photocatalytic deodorizing device 100 draws air from the freezer compartment into a ventilation cavity 106, where a purification module 101 decomposes the odor gas molecules. Optionally, such as... Figure 5 As shown above, Figure 3 The second gas concentration detector 109 can be installed in the refrigerator compartment, thereby combining with the first gas concentration detector 108 installed in the photocatalytic deodorizing device. By using the odor gas concentration values ​​detected at the two locations, the power of the fan 104 and the speed of the motor module 1012 included in the photocatalytic deodorizing device can be adaptively adjusted.

[0058] The refrigerator provided in this application embodiment can efficiently purify odor gases inside the refrigerator by setting a photocatalytic odor removal device therein, thereby improving the odor purification effect and automation level of the refrigerator.

[0059] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different devices to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0060] The steps of the apparatus or algorithm described in connection with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0061] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0062] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A photocatalytic odor-removing device, characterized by comprising: The photocatalytic odor removal device includes: a purification module, an air inlet, an air outlet, a fan, an ultraviolet lamp assembly, a ventilation cavity, and a controller. The purification module includes a purification medium attachment unit and a motor module. The purification medium attachment unit includes an adsorbent material immobilized with a photocatalyst. The controller is electrically connected to the motor module; The purification medium attachment unit is fixed on the motor module, the motor module is disposed on the first side wall of the ventilation cavity, and the purification medium attachment unit is located inside the ventilation cavity. The ultraviolet lamp assembly is disposed on the second side wall of the ventilation cavity.

2. The photocatalytic odor-removal device according to claim 1, wherein The number of purification modules is at least two. The ventilation cavity includes an airflow barrier wall. The airflow barrier wall is provided with a vent. The airflow direction of the ventilation cavity is from the vent to the air outlet. The purification medium attachment unit included in each purification module is arranged in the ventilation cavity in sequence according to the airflow direction. The ventilation cavity is connected to the air intake space inside the photocatalytic deodorizing device through the ventilation port. The air intake space is the space inside the photocatalytic deodorizing device other than the ventilation cavity. The fan and the air intake port are located on the side wall of the air intake space.

3. The photocatalytic odor removal device according to claim 1, characterized in that, The photocatalytic odor removal device also includes a first gas concentration detector, which is electrically connected to the controller and is located outside the ventilation cavity.

4. The photocatalytic odor removal device according to claim 3, characterized in that, The photocatalytic odor removal device also includes a second gas concentration detector, which is electrically connected to the controller and is disposed inside the ventilation cavity.

5. The photocatalytic odor removal device according to claim 1, characterized in that, The motor module includes a rotating motor, a rotating bearing, and a rotating structure. The rotating motor is connected to the rotating structure through the rotating bearing, and the purification medium attachment unit is detachably fixed to the rotating structure through a mounting component on the rotating structure.

6. A refrigerator, characterized in that, Includes the photocatalytic odor removal device according to any one of claims 1-5.

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