A foldable oven

Abstract

This invention relates to a foldable oven, comprising a shell with an internal cooking cavity. One side of the shell has an opening for placing and removing food. A door sealing the cooking cavity is located at the opening. A heating element is disposed within the cooking cavity, including a heating tube that is movably installed within the cooking cavity and extends towards the opening. The shell has multiple states, with different positions of the heating tube and different spatial volumes occupied by the shell in each state. The shell includes stackable unit segments. Along the opening towards the cooking cavity, adjacent unit segments at least partially extend and overlap to change the shell's orientation. By providing multiple spatial states for the shell, it can accommodate different foods and effectively store the oven. The stacking operation along the door facilitates user operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of food processing, in particular to a foldable oven. BACKGROUND

[0002] The existing oven includes a shell with a cooking cavity, and a heating assembly is arranged in the cooking cavity. The heating assembly generates heat and cooks the food in the cooking cavity. In order to consider the diversity of food during the use of the oven, the space volume of the general oven is relatively large and fixed in size, so that the oven cannot reduce the volume when it is stored, and a large storage space is occupied by the oven, which affects the use experience.

[0003] In addition, when different foods are baked, if there is a large difference between the size of the food and the space of the cooking cavity, a large amount of heat will be lost, reducing the use efficiency of heat.

[0004] In the prior art, Chinese patents CN210989807U and CN212261174U disclose the folding and telescoping mode of the oven, but since the oven door is generally arranged on the front side and needs to be opened, the door structure is complex and inconvenient for users to operate. SUMMARY

[0005] In order to solve the problems of the prior art, the present application provides a foldable oven, which adjusts the volume of the shell by arranging multiple unit segments telescoped along the direction of the door, facilitates storage, has a simple structure and is easy to operate, and improves the use experience.

[0006] The present application is achieved by the following way: a foldable oven includes a shell with a cooking cavity, the shell is provided with an opening for taking and placing food on one side, the opening is provided with a door body for sealing the cooking cavity, the cooking cavity is provided with a heating assembly, the heating assembly includes a heating pipe arranged in the cooking cavity, wherein the heating pipe is movably mounted in the cooking cavity and extends towards the opening direction, the shell includes multiple states, in different states, the position state of the heating pipe is different and the space volume occupied by the shell is different, the shell includes telescoped unit segments along the opening towards the cooking cavity direction, and adjacent unit segments are at least partially telescoped to change the state of the shell.

[0007] By setting multiple space states of the shell to adapt to different food materials, and effectively storing the oven, the shell comprises at least two telescopic nested unit segments, the adjacent unit segments are hidden by telescopic nesting, the smaller volume is obtained by reducing the front-back dimension of the shell, the number of single baking food materials is increased by obtaining a larger cooking cavity, and the shell volume is reduced to facilitate storage and improve the use experience. At the same time, the telescopic direction is set along the direction of the door body, so that the door body structure does not change. Since the door body needs to be opened and closed by the user, the structure is simplified. In addition, the user usually operates the oven standing in front of the oven door, and operates along the door direction, which is convenient for the user to operate. The heating pipe is movably installed in the cooking cavity and extends towards the opening direction, so that the heating pipe can be operated during the state change operation to adapt, and multiple sets of heating pipes are not arranged to increase the structural complexity and cost.

[0008] As preferred, the unit segment is provided with an annular accommodating cavity, and when the adjacent unit segments are telescoped along the axis, the unit segment away from the opening end is inserted into the accommodating cavity of the unit segment close to the opening end.

[0009] The unit segment is hidden by inserting the accommodating cavity provided therein by the adjacent unit segment, the front-back dimension of the shell is shortened by telescoping, and the storage is facilitated. By inserting the unit segment away from the door body into the accommodating cavity of the unit segment close to the door body, the user stands in front of the door body, which is convenient for the user to operate.

[0010] As preferred, the unit segment comprises a cover ring and a cavity ring inserted into the cover ring, and the axes of the cover ring and the cavity ring are arranged in front and back in the movement direction to form the accommodating cavity between the inner wall of the cover ring and the outer wall of the cavity ring.

[0011] The cover rings of the adjacent unit segments match and splice to form the shell, the cavity rings of the adjacent unit segments match and splice to form the cooking cavity, the cavity ring in the unit segment is inserted into the cover ring, and the accommodating cavity is formed by the surrounding, so that the adjacent unit segments are inserted and hidden.

[0012] As preferred, a telescopic slide rail assembly is arranged parallel to the movement direction of the unit segment, and the unit segments are connected by the slide rail assembly.

[0013] By arranging the cross slide rail assembly between the unit segments, each unit segment can move along the preset path and smoothly telescopic nest, effectively preventing the damage and jamming of the unit segments due to impact and friction, and effectively improving the use experience.

[0014] As preferred, the unit sections are three, including a front section, a middle section and a rear section arranged coaxially from the opening to the cooking cavity, the slide rail assembly includes an outer rail fixed with the front section, a middle rail fixed with the middle section and an inner rail fixed with the rear section, the inner rail slides along the middle rail and guides the rear section to be inserted in the middle section, and the middle rail slides along the outer rail and guides the middle section to be inserted in the front section.

[0015] The shell includes three unit sections, and is sequentially named as a front section, a middle section and a rear section from front to back, which not only simplifies the structure, facilitates production and assembly, but also shortens the front-to-back dimension of the shell through mutual telescoping, facilitating storage.

[0016] The inner rail cooperates with the middle rail to guide the telescopic telescoping of the rear section and the middle section, and the middle rail cooperates with the outer rail to guide the telescopic telescoping of the middle section and the front section, ensuring accurate movement of the rear section and the middle section.

[0017] As preferred, the slide rail assembly is arranged on one side of the shell, and a guide sleeve is arranged on the other side of the shell.

[0018] The slide rail is arranged at the bottom to support the weight of the shell and drive the sliding of the shell, and a corresponding guide sleeve is arranged on the other side of the shell, thereby forming a structure of the other side of the bottom slide rail being guided, ensuring smooth folding and simplifying the structure.

[0019] As preferred, the guide sleeve includes an axle base and a guide bracket arranged on the front section and the rear section, and a guide axle cooperated with the axle base and the guide bracket.

[0020] The guide axle is fixed on the axle base and movable relative to the guide bracket. In this way, the rear end of the oven is relatively stationary, and the front section is moved to facilitate user operation.

[0021] As preferred, the guide bracket and the guide axle are cooperated in an arc shape. In this way, the guide axle is cooperated with the guide bracket in both open and folded states, ensuring that the shell will not fall off.

[0022] As preferred, the end edges of the heating pipe are rotatably connected to the cavity wall of the cooking cavity, so that the heating pipe can be switched to match the state of the shell.

[0023] The heating pipe is switched between the storage state and the use state by rotation to adapt to the state of the shell, the heating pipe is horizontally arranged when the heating pipe is in the use state and can cover the top wall of the cooking cavity, the vertical projection area of the heating pipe is reduced by rotation, and then the heating pipe is hidden in the shell in the telescopic state.

[0024] As preferred, the end edges of the heating pipe extend outward to form pins with coinciding axes, the cavity wall of the cooking cavity is provided with a connecting seat, the connecting seat is provided with a connecting hole arranged coaxially, and the pins are rotatably inserted into the connecting hole through a ceramic sleeve.

[0025] The pins are used for receiving external power supply to ensure that the heating pipe is powered to generate heat, and also serve as pivot points for rotation to ensure that the heating pipe can swing between the use state and the storage state about the pins as the axes. The ceramic sleeve plays a role in heat insulation and insulation.

[0026] The folding oven provided by the application has the beneficial effects that: the shell is provided with multiple space states to adapt to different food materials, and the oven can be effectively stored, the shell includes at least two telescopic unit segments, the adjacent unit segments are hidden through telescopic stacking, the volume of the shell is reduced through reduction of the front-to-back dimension, the number of food materials baked at one time is increased through the larger cooking cavity, the shell volume is reduced to facilitate storage, and the use experience is improved. Meanwhile, the telescopic direction is set as the direction of the door body, so that the door body structure does not change, and the structure is simplified because the door body needs to be opened and closed by the user. In addition, the user generally stands in front of the oven door body to operate the oven along the door body direction, which is convenient for the user to operate. The heating pipe is movably arranged in the cooking cavity and extends toward the opening direction, so that the heating pipe is convenient to operate during the state change operation to adapt, and multiple sets of heating pipes are avoided to increase the structural complexity and cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A structure schematic view of the folding oven in the use state according to the first embodiment;

[0028] Figure 2 A partial sectional structure schematic view of the folding oven according to the first embodiment;

[0029] Figure 3 A partial installation schematic view of the heating pipe of the folding oven according to the first embodiment;

[0030] Figure 4 A structure schematic view of the folding oven in the telescopic state according to the first embodiment;

[0031] Figure 5 A sectional structure schematic view of the folding oven according to the second embodiment;

[0032] Figure 6 This is a schematic diagram of the slide rail assembly structure of the folding oven described in Embodiment 2;

[0033] Figure 7 This is a cross-sectional view of the folding oven described in Example 3. Detailed Implementation

[0034] The essential features of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] Example 1:

[0036] This embodiment provides a folding oven.

[0037] like Figure 1 The folding oven shown consists of a shell 1 with an internal cooking cavity. The front side of the shell 1 has an opening for taking out and putting in food. The opening has a door that seals the cooking cavity. The cooking cavity is equipped with a heating element 3, which generates heat and cooks the food inside the cooking cavity. The shell 1 includes stackable unit sections 19. Along the opening toward the cooking cavity, adjacent unit sections are at least partially telescopically stacked to reduce the volume of the shell 1.

[0038] In this embodiment, a heating element is provided inside the cooking cavity. The heating element includes a heating tube disposed within the cooking cavity, which is movably installed inside the cooking cavity and extends toward the opening. In use, firstly, the food is placed inside the cooking cavity and the cooking cavity is sealed; then, the heating element is turned on, and the heating element generates heat to cook the food.

[0039] In this embodiment, the amount of food that the oven can bake at one time is related to the size of the cooking cavity. The larger the volume of the cooking cavity, the more food can be baked at one time, thus reducing the number of cooking times when baking a large amount of food and improving the cooking experience. However, increasing the volume of the cooking cavity will lead to a corresponding increase in the volume of the shell 1, making the oven inconvenient to store and requiring a larger space to place the oven when not in use, which affects the user experience. Conversely, if the food is small but the size of the cooking cavity is too large, the thermal efficiency will be reduced, wasting resources. To address this, the shell 1 is improved to include multiple retractable and stackable unit segments 19. By inserting and stacking adjacent unit segments 19, the size of the shell 1 is reduced, thereby facilitating the storage and transportation of the oven and improving the user experience. At the same time, a movable heating element is used to adapt the cooking cavity to different shell states.

[0040] In the embodiment, the shell comprises nestable unit segments, adjacent unit segments are at least partially telescoped along the direction from the opening to the cooking cavity, the volume of the shell 1 is reduced by increasing the number of unit segments 19, and the shell 1 is conveniently stored and transported by reducing the volume.

[0041] In the embodiment, adjacent unit segments 19 are at least partially telescoped when stored to reduce the volume of the shell 1, and the unit segments 19 can be telescoped with adjacent unit segments 19 on both sides at the same time, effectively increasing the reduced volume of the shell 1.

[0042] Specifically, as shown in Figures 2-4 The heating assembly 3 comprises a heating pipe 32 arranged in the cooking cavity, and the end edges of the heating pipe 32 are rotatably connected to the side walls of the cooking cavity, so that the heating pipe 32 can be switched between the storage state of vertical arrangement and the use state of horizontal arrangement. The heating pipe 32 is of a planar structure, and coaxial pins 321 are arranged at the two sides of the end edges of the heating pipe 32, and the pins 321 are rotatably arranged on the two pairs of vertical side walls of the cavity ring, so that the heating pipe 32 can swing around the pins 321 between the horizontal posture and the vertical posture. The area of the vertical projection of the heating pipe 32 is adjusted by adjusting the posture of the heating pipe 32, so as to match the change of the volume of the cooking cavity, which can not only uniformly and effectively heat the cooking cavity by using the heating pipe 32 in the horizontal posture when the shell 1 is in the use state, thereby improving the cooking effect, but also can hide the heating pipe 32 in the vertical posture when the shell 1 is in the telescoped state, thereby facilitating storage.

[0043] In the embodiment, the end edges of the heating pipe 32 extend outward to form the pins 321 with the same axis, the side walls of the cooking cavity are provided with connecting seats 33, the connecting seats 33 are provided with coaxial connecting holes 331, and the pins 321 are rotatably inserted into the connecting holes 331 through ceramic sleeves. The heating disc 32 is formed by reciprocating bending of an elongated heating pipe, and the two end portions of the heating pipe form the pins 321, which can guide the heating disc 32 to swing around the preset axis and provide the heating disc 32 with the electric energy required for heating, thereby ensuring uniform heating of each area of the heating disc.

[0044] Specifically, the heating pipe 32 is two and is arranged at the top and bottom of the cooking cavity. The heating pipes 32 are respectively fixed to the top and bottom of the side walls of the cavity ring through their respective pins. In use, the two heating pipes are arranged in parallel with each other, ensuring that the food materials located in the middle of the cooking cavity are uniformly cooked. When the heating pipes 32 are in the storage position, the two heating pipes 32 are suspended in the cooking cavity in a vertical posture, so that they are heated and interfere with each other and are hidden, effectively reducing the space required for hiding, so that the adjacent unit segments can be telescoped and stored.

[0045] Embodiment two:

[0046] Compared to Embodiment 1, this embodiment provides an improved fit structure that facilitates the nesting movement of each unit segment.

[0047] like Figure 5 As shown, the unit section consists of three segments, including a front section 11, a middle section 12, and a rear section 13 arranged coaxially from the door body to the rear. The rear section 13 is detachably disposed at the rear of the middle section 12, and the middle section 12 is detachably disposed at the rear of the front section 11, so that the housing 1 can extend and retract between the storage state and the use state.

[0048] In this embodiment, the unit segment is provided with an annular receiving cavity 14. When adjacent unit segments extend and retract along their axis, the rear unit segment is inserted into the receiving cavity of the front unit segment to reduce the volume of the housing 1. Both the front segment 11 and the middle segment 12 are provided with annular receiving cavities, which are respectively named the front receiving cavity and the middle receiving cavity. Both the front receiving cavity and the middle receiving cavity are columnar with their axes arranged in the front-to-back direction, which facilitates the insertion and stacking of the corresponding unit segments along their axial direction. The front-to-back projection of the rear unit section falls entirely within the receiving cavity of the front unit section. Specifically, the front-to-back projection of the front receiving cavity completely covers the front-to-back projection of the middle section 12, allowing the middle section 12 to be inserted forward into the front receiving cavity, thus concealing the middle section 12 within the front section 11. Similarly, the front-to-back projection of the middle receiving cavity completely covers the front-to-back projection of the rear section 13, allowing the rear section 13 to be inserted forward into the middle receiving cavity without interfering with the front section 11, thus concealing the rear section 13 within the middle section 12. By matching and stacking adjacent unit sections, the front-to-back dimensions of the housing 1 are reduced, thereby facilitating storage and transportation by minimizing the volume of the housing 1.

[0049] In this embodiment, the periphery of the front port of the rear section 13 is inserted into the rear port of the central receiving cavity, and the periphery of the front port of the central section is inserted into the rear end of the front receiving cavity. At this time, the front port of the rear section 13 and the rear port of the central receiving cavity, as well as the front port of the central section 12 and the rear port of the front receiving cavity, are sealed and connected by a sealing component to ensure that the cooking cavity formed by the front section 11, the central section 12, and the rear section 13 is isolated from the external space, thereby improving cooking efficiency by reducing heat leakage from the cooking cavity.

[0050] When the oven needs to be stored, adjacent unit sections are inserted and stacked by pushing the front and rear walls of the shell 1 forward and backward. During the pushing and compression process, the rear section 13 is inserted forward into the central receiving cavity of the middle section 12, and the middle section 12 is inserted forward into the front receiving cavity of the front section 11. After being inserted into place, the front part of the rear section 13 is inserted into the middle section 12, and the middle section 12 is inserted into the rear part of the front section 11, so that the rear part of the front section 11, the middle section 12, and the front part of the rear section 13 are stacked sequentially from the outside to the inside, effectively utilizing the inner and outer spaces of the middle section 12 and ensuring that the volume of the shell 1 is effectively reduced.

[0051] When the oven needs to be used, the front and rear walls of the shell 1 are stretched back and forth to drive the adjacent unit sections to separate from each other. During the stretching process, the rear section 13 separates from the central receiving cavity, and the central section 12 separates from the front receiving cavity, so that the cooking cavity expands and returns to the usable state, making it convenient for the user to perform baking operations.

[0052] In this embodiment, the unit segment includes a cover ring and a cavity ring inserted within the cover ring. The axes of the cover ring and the cavity ring are both arranged in a front-rear direction to enclose the receiving cavity 14 between the inner wall of the cover ring and the outer wall of the cavity ring. The cavity ring and cover ring of the front segment 11 match to form a front receiving cavity, and the cavity ring and cover ring of the middle segment 12 match to form a middle receiving cavity.

[0053] In this embodiment, a front panel 15 is fitted over the front port of the front section 11. The front panel 15 has an opening in the middle, and a door 16 that can be opened and closed is provided on the opening. The periphery of the front panel 15 is fixedly connected to the periphery of the front port of the cavity ring and the cover ring of the front section 11, respectively. The middle part has an opening communicating with the cooking cavity, and the door 16 that can be opened and closed is provided at the opening. Since the rear section 13 and the middle section 12 are both hidden inside the front section 11, the cover ring and the front panel 15 of the front section 11 are always exposed, ensuring the aesthetics of the oven. The cavity ring of the front section 11 is always exposed in the cooking cavity, providing space for the heating components.

[0054] In this embodiment, a rear plate 17 is fitted over the rear port of the rear section 13. The periphery of the rear plate is fixedly connected to the periphery of the rear port of the cavity ring and the cover ring of the rear section 13, ensuring the aesthetics of the housing 1 and forming the rear wall of the cooking cavity, ensuring that the cooking cavity is isolated from the outside space. When the housing 1 is in a stacked state, the rear plate 17 is exposed on the rear wall of the housing 1, preventing the accumulation of dust and foreign objects in the cooking cavity due to exposure.

[0055] In this embodiment, the bottom of the front section 11 is provided with a slide rail assembly 2, which is respectively connected to the middle section 12 and the rear section 13, so that the middle section 12 and the rear section 13 retract and overlap towards the front section 11 under the guidance of the slide rail assembly 2. The slide rail assembly 2 can guide the front section 11, the middle section 12 and the rear section 13 to move precisely along a preset path, and make the housing 1 switch smoothly between the overlapping state and the use state. This not only effectively prevents wear between adjacent unit sections and extends the service life of the housing 1, but also improves the operating experience by reducing the resistance to expansion and contraction.

[0056] In this embodiment, sealing components are provided on the rear edge of the front section 11 and the front edge of the rear section 13. When the housing 1 is in use, the front section 11 and the middle section 12, and the middle section 12 and the rear section 13 are sealed together by the sealing components to isolate the cooking cavity from the outside space. The sealing components can lubricate the adjacent unit sections when they slide and overlap, preventing friction damage, and can also seal the joints between adjacent unit sections to prevent heat leakage when cooking food, effectively improving cooking efficiency.

[0057] In this embodiment, the front edge of the inner wall of the cavity ring of the front section 11 is provided with several vertically staggered front support blocks 111, and the rear edge of the inner wall of the cavity ring of the rear section 13 is provided with rear support blocks 131 that are aligned with the front support blocks 111 one by one at the same height. The top surfaces of the front support blocks 111 and the corresponding rear support blocks 131 form a support platform for supporting the baking pan. The rear support blocks 131 and the front support blocks 111 cooperate to support the baking pan so that the baking pan is horizontally placed in the middle of the cooking cavity.

[0058] In this embodiment, the front-to-back dimensions of the front section 11 and the rear section 13 are both larger than the front-to-back dimensions of the middle section 12. When the housing 1 is switched to the stacked state, the front part of the front section 11 and the middle section 12 are not stacked, and the rear part of the rear section 13 is exposed outside the middle section 12. The front support block 111 is formed by the inward indentation of the front part of the cavity ring of the front section 11, which will not affect the insertion of the middle section 12 into the front receiving cavity. The rear support block 131 is formed by the inward indentation of the rear part of the cavity ring of the rear section 13, which will not affect the insertion of the front part of the rear section 13 into the middle receiving cavity.

[0059] In this embodiment, as Figure 6As shown, the slide rail assembly 2 includes an outer rail 21 fixedly connected to the front section, a middle rail 22 fixedly connected to the middle section, and an inner rail 23 fixedly connected to the rear section. The inner rail 23 slides along the middle rail 22 and guides the rear section to be inserted into the middle section 13. The middle rail 22 slides along the outer rail 21 and guides the middle section to be inserted into the front section. The inner rail 23 can slide along the middle rail 22, and the middle rail 22 can slide along the outer rail 21 in the same direction. This allows the slide rail assembly 2 to switch between an extended state where both the inner rail 23 and the middle rail 22 are exposed, and a retracted state where both the inner rail 23 and the middle rail 22 are hidden. This enables precise movement of the unit sections and ensures smooth switching between the use state and the extended state of the housing 1.

[0060] In this embodiment, an outer groove 211 for sliding of the middle rail 22 is formed in the middle of the top surface of the outer rail 21, and an inner groove 221 for sliding of the inner rail 23 is formed in the middle of the top surface of the middle rail 22. The vertical cross-sectional profile of the outer groove 211 matches the vertical cross-sectional profile of the outer wall of the middle rail 22, so that the middle rail 22 can fit with the inner wall of the outer groove 211 through the matching of the outer wall. The vertical cross-sectional profile of the inner groove 221 matches the vertical cross-sectional profile of the outer wall of the inner rail 23, so that the inner rail 23 can fit with the inner wall of the inner groove 221 through the matching of the outer wall. By reducing the gap, the accuracy of the expansion and contraction direction is improved, thereby ensuring that adjacent unit segments 11 are smoothly overlapped.

[0061] In use, the user pushes the front section and the rear section in opposite directions to drive the rear section and the middle section to overlap forward along the direction set by the slide rail assembly, so that the housing is switched to the overlapping state.

[0062] Example 3:

[0063] Compared to Embodiment 2, this embodiment provides an improved mating structure that facilitates the nesting movement of the guiding unit segments.

[0064] like Figure 7 As shown, the slide rail assembly 2 is disposed on one side supporting the housing, and guide sleeves are provided on the other sides of the housing. The guide sleeve includes a shaft base 41 and a guide bracket 43 disposed on the front and rear sections respectively, and a guide shaft 42 that engages with the shaft base 41 and the guide bracket 43. One end of the guide shaft 42 is fixedly mounted on the shaft base 4, and the other end is inserted into the guide bracket 43. The portion of the guide bracket 43 that engages with the guide shaft 42 is arc-shaped. The diameter of the guide shaft is approximately 0.5 mm to ensure assembly accuracy.

[0065] A slide rail is installed at the bottom to support the weight of the shell and facilitate its sliding. Corresponding guide sleeves are installed on other sides of the shell, forming a structure that guides the bottom slide rail on other surfaces. This ensures smooth folding and simplifies the structure. A guide shaft is fixed to a shaft base, allowing it to move relative to the guide bracket. Thus, the rear end of the oven remains relatively stationary, while movement is achieved through the front end, facilitating user operation. The part of the guide bracket that mates with the guide shaft is arc-shaped. This ensures that the guide shaft engages with the guide bracket whether the oven is open or folded, preventing the shell from detaching.

[0066] By providing multiple spatial states for the oven shell to accommodate different ingredients and effectively store the oven, the shell comprises at least two retractable and nested unit sections. Adjacent unit sections are concealed by retractable nesting, and a smaller volume is achieved by reducing the front-to-back dimensions of the shell. This allows for a larger cooking cavity to increase the amount of food that can be baked at once, while the reduced shell volume facilitates storage and improves the user experience. Furthermore, the nesting direction is set along the door, so the door structure remains unchanged. Since the door requires user operation, this simplifies the structure. Additionally, users typically operate the oven standing in front of the oven door, moving along the door direction for ease of use. The heating element is movably installed within the cooking cavity and extends towards the opening, allowing for adjustment during changes in operating states. This avoids the need for multiple heating elements, which would increase structural complexity and cost.

[0067] The other structures and effects of the oven described in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

Claims

1. A foldable oven, comprising a housing with a cooking cavity, an opening on one side of the housing for taking and placing food, a door body provided at the opening for sealing the cooking cavity, and a heating assembly provided in the cooking cavity, wherein the heating assembly comprises a heating tube arranged in the cooking cavity and extending towards the opening, the housing comprises a plurality of states, in different states, the position of the heating tube is different and the volume of the housing is different, the housing comprises a plurality of stackable unit segments, along the opening towards the cooking cavity, adjacent unit segments are at least partially telescoped to change the state of the housing, and the end edges of the heating tube are rotatably connected to the cavity wall of the cooking cavity so that the heating tube can be switched to match the state of the housing.

2. The foldable oven according to claim 1, wherein an annular receiving cavity is provided on the unit segment, and when adjacent unit segments are telescoped along the axis, the unit segment away from the opening end is inserted into the receiving cavity of the unit segment close to the opening end.

3. The foldable oven according to claim 2, wherein the unit segment comprises a cover ring and a cavity ring inserted into the cover ring, and the axes of the cover ring and the cavity ring are arranged in front and back of the movement direction to form the receiving cavity between the inner wall of the cover ring and the outer wall of the cavity ring.

4. The foldable oven according to claim 1, wherein a telescopic slide rail assembly is provided parallel to the movement direction of the unit segment, and the unit segments are connected through the slide rail assembly.

5. The foldable oven according to claim 4, wherein the unit segments are three, comprising a front segment, a middle segment and a rear segment coaxially arranged from the opening to the cooking cavity, the slide rail assembly comprises an outer rail fixedly connected with the front segment, a middle rail fixedly connected with the middle segment, and an inner rail fixedly connected with the rear segment, the inner rail slides along the middle rail and guides the rear segment to be inserted into the middle segment, and the middle rail slides along the outer rail and guides the middle segment to be inserted into the front segment.

6. The foldable oven according to claim 5, wherein the slide rail assembly is arranged on one side of the housing, and a guide sleeve is arranged on the other side of the housing.

7. The foldable oven according to claim 6, wherein the guide sleeve comprises an axis base and a guide bracket arranged on the front segment and the rear segment, and a guide axis matched with the axis base and the guide bracket.

8. The foldable oven according to claim 7, wherein the matched part of the guide bracket and the guide axis is arc-shaped.

9. The foldable oven according to claim 6, wherein the end edges of the heating tube extend outward to form pins with the same axis, the cavity wall of the cooking cavity is provided with a connecting seat, the connecting seat is provided with a connecting hole coaxially arranged, and the pins are rotatably inserted into the connecting hole through a ceramic sleeve. ​ ​ ​ ​ ​ ​ ​ ​ ​

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