Freshness preservation machine

Abstract

The present utility model belongs to the technical field of freshness preservation machines, and provides a freshness preservation machine. The freshness preservation machine comprises a first clamping arm and a second clamping arm which are rotationally connected; a first annular sealing ring is provided on a first clamping part of the first clamping arm, and a second annular sealing ring opposite to the first annular sealing ring is provided on a second clamping part of the second clamping arm. The freshness preservation machine further comprises a rotating support, the rotating support being rotationally arranged on the second clamping part, and the second annular sealing ring being fixedly arranged on the rotating support. When the second clamping arm rotates relative to the first clamping arm, the rotating support can rotate relative to the second clamping part so as to automatically adjust stress balance, such that the two annular sealing rings are in sealed connection. The freshness preservation machine can improve the sealing effect when vacuumizing freshness preservation bags.

Description

A fresh-keeping machine Technical Field

[0001] The utility model belongs to the technical field of fresh-keeping machines, in particular to a fresh-keeping machine. Background Art

[0002] Currently, small food fresh-keeping devices on the market are low-cost and portable. For example, Chinese patent application number CN220281903U discloses a handheld food fresh-keeping device that includes a rotatably connected upper cover and a main body. A first sealing ring is provided on the mating surface of the main body, and a second sealing ring is provided on the mating surface of the upper cover. The first and second sealing rings mate to form a vacuum zone between the upper cover and the main body. However, the two sealing rings of this handheld food fresh-keeping device cannot automatically adjust their balance. This can lead to excessive pressure on the first contacting end, while the other end may be loosely pressed. After a period of use, the sealing strip can become deformed and the sealing effect is poor. Technical Solutions

[0003] In view of the above-mentioned problems existing in the prior art, an object of the embodiments of the present utility model is to provide a fresh-keeping machine, which can improve the sealing effect when vacuuming a fresh-keeping bag.

[0004] The technical solution adopted in the embodiment of the utility model is:

[0005] A fresh-keeping machine includes a first clamping arm and a second clamping arm that are rotatably connected. The first clamping portion of the first clamping arm is provided with a first annular sealing ring, and the second clamping portion of the second clamping arm is provided with a second annular sealing ring opposite to the first annular sealing ring. The fresh-keeping machine also includes a rotating frame, which is rotatably provided on the second clamping portion. The second annular sealing ring is fixed on the rotating frame. When the second clamping arm rotates relative to the first clamping arm, the rotating frame can rotate relative to the second clamping portion to allow the two annular sealing rings to be sealed and docked.

[0006] Furthermore, the fresh-keeping machine also includes a knife assembly, which includes a knife seat, a knife holder movably connected to the knife seat, and a cutting knife provided on the knife holder. The knife seat is provided on the first gripping portion of the first clamping arm. When the second gripping portion of the second clamping arm approaches the first gripping portion of the first clamping arm, the second gripping portion can push the knife holder to move relative to the knife seat, so that the fresh-keeping bag can be cut by the cutting knife. By providing the knife assembly, the fresh-keeping machine can have the function of cutting or opening the bag.

[0007] Furthermore, the knife holder is provided with a cutting groove, the cutting knife extends into the interior of the cutting groove from a first groove wall, and a cutting edge is provided on a second groove wall of the cutting groove opposite to the first groove wall. The knife holder can drive the cutting knife into the cutting edge to cut the fresh-keeping bag. The provision of the cutting groove not only improves the cutting effect, but also prevents the cutting knife from accidentally injuring the user.

[0008] Furthermore, the fresh-keeping machine further includes an air pump and an air extraction hole, the air pump and the air extraction hole being provided on the first clamping portion, the air extraction hole being provided in the area surrounded by the first annular sealing ring, the air pump being in communication with the air extraction hole. The air pump and the air extraction hole can be used to vacuum the fresh-keeping bag, thereby improving the fresh-keeping effect.

[0009] Furthermore, the fresh-keeping machine also includes a heating element and a pressure strip. The heating element is provided on the first clamping portion, and the pressure strip is provided on the second clamping portion. The pressure strip can abut against the heating element to clamp the fresh-keeping bag, and the heating element can heat-seal the fresh-keeping bag after heating. The cooperation between the heating element and the pressure strip can make the fresh-keeping machine have a sealing function.

[0010] Furthermore, the first grip portion includes a grip bottom shell and a grip top cover. The grip top cover is buckled onto the grip bottom shell to form a grip cavity with the grip bottom shell. The grip cavity is equipped with a battery assembly for powering the air pump and the heating element, respectively. This structure improves the utilization of the internal space of the fresh-keeping machine.

[0011] Furthermore, the second gripping portion includes a gripping lower cover, which defines a bottom shell cavity, and when the gripping portions of the two clamping arms are brought close to each other, the first gripping portion can extend into the bottom shell cavity. This structure ensures the compactness of the fresh-keeping machine.

[0012] Furthermore, the first clamping portion includes a clamping bottom shell and a clamping middle cover, the clamping middle cover is buckled on the clamping bottom shell and defines a second cavity with the clamping bottom shell, and the air pump is disposed in the second cavity.

[0013] Furthermore, the second clamping portion includes a clamping upper cover and a fixing frame extending into the clamping upper cover, the rotating frame is rotatably connected to the fixing frame, the first annular sealing ring is fixed on the clamping middle cover, and the second annular sealing ring is fixed on the fixing frame.

[0014] Furthermore, the heating element is arranged on the clamping middle cover, and the pressure strip is arranged on the fixing frame. Beneficial effects

[0015] Compared with the prior art, the beneficial effects of the embodiments of the present invention are:

[0016] The fresh-keeping machine of the present invention is provided with a rotatable rotating frame on the clamping part of the second clamping arm, and the second sealing ring is fixedly arranged on the rotating frame. When the clamping parts of the two clamping arms clamp the fresh-keeping bag, after the edge of the second sealing ring contacts the edge of the first sealing ring, it can drive the rotating frame to rotate, so that the two sealing rings are squeezed in a coaxial posture and balanced, thereby achieving an ideal sealing effect of the fresh-keeping bag when vacuuming.

[0017] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention.

[0018] The overview of various implementations or examples of the technology described in this utility model is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar components. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the description and claims, serve to illustrate the embodiments of the utility model. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0020] FIG1 is a schematic diagram of the three-dimensional structure of a fresh-keeping machine according to an embodiment of the present invention;

[0021] FIG2 is an exploded view of the fresh-keeping machine according to an embodiment of the present invention;

[0022] Figure 3 is a main sectional view of the fresh-keeping machine according to an embodiment of the present invention;

[0023] FIG4 is a front view of the fresh-keeping machine according to an embodiment of the present invention;

[0024] FIG5 is a cross-sectional view of the clamping process of the two clamping arms of the fresh-keeping machine according to an embodiment of the present invention;

[0025] FIG6 is an enlarged view of portion I in FIG5 ;

[0026] FIG7 is a cross-sectional view of the fresh-keeping machine according to an embodiment of the utility model after being clamped by two clamping arms;

[0027] FIG8 is an enlarged view of part II in FIG7 .

[0028] In the figure: 1. first clamping arm; 10. first clamping part; 100. clamping middle cover; 101. clamping bottom shell; 11. first gripping part; 110. gripping upper cover; 111. gripping bottom shell; 12. linkage rod assembly; 13. battery assembly; 14. circuit board; 15. first annular sealing ring; 16. exhaust hole; 17. exhaust nozzle; 2. second clamping arm; 20. second clamping part; 21. second gripping part; 22. rotating shaft; 23. second annular sealing ring; 24. bottom shell cavity; 3. pin; 4. air pump; 5. pressure strip; 6. heating element; 7. rotating frame; 8. fixed frame; 9. knife assembly; 91. knife frame; 92. cutting knife; 93. knife seat; 94. spring; 95. cutting groove. Best Mode for Carrying Out the Invention

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to keep the following description of the embodiments of the present invention clear and concise, the present invention omits detailed descriptions of known functions and known components.

[0031] The present invention provides a fresh-keeping machine, as shown in Figures 1 to 3. The fresh-keeping machine includes a first clamping arm 1 and a second clamping arm 2 that are rotatably connected. The first clamping arm 1 includes a first clamping portion 10 and a first gripping portion 11, and the second clamping arm 2 includes a second clamping portion 20 and a second gripping portion 21. The clamping portions of the two clamping arms are used to cooperate with each other to clamp the opening of a fresh-keeping bag, and the gripping portions of the two clamping arms are used by the user to hold the fresh-keeping machine. The gripping portions of the two clamping arms are connected by a pin 3, so that the two clamping arms can rotate relative to each other to clamp or release the fresh-keeping bag.

[0032] In this embodiment, a first annular sealing ring 15 is provided on the first clamping portion 10 of the first clamping arm 1, and a second annular sealing ring 23 opposite to the first annular sealing ring 15 is provided on the second clamping portion 20 of the second clamping arm 2. The two annular sealing rings are of the same size.

[0033] When the two clamping arms clamp the fresh-keeping bag, the first annular sealing ring 15 and the second annular sealing ring 23 can be tightly connected to form a vacuum zone in the area surrounded by the two annular sealing rings. The bag opening of the fresh-keeping bag can be clamped in the vacuum zone, and then the fresh-keeping belt can be vacuumed.

[0034] As shown in Figures 2 and 3, the fresh-keeping machine of this embodiment further includes a rotating frame 7, which is rotatably mounted on the second clamping portion 20. The rotating frame 7 can rotate relative to the second clamping portion 20, and the rotation direction of the rotating frame 7 is consistent with the rotation direction of the two clamping arms.

[0035] The second annular sealing ring 23 is fixed on the rotating frame 7. When the second clamping arm 2 rotates relative to the first clamping arm 1, the rotating frame 7 can rotate relative to the second clamping portion 20 to automatically adjust the force balance so that the two annular sealing rings can be tightly sealed and docked.

[0036] Specifically, as shown in Figures 5 and 6, when the second clamping arm 2 rotates relative to the first clamping arm 1, the end A2 of the second annular seal ring 23 close to the pin 3 will first be squeezed and contacted with the end A1 of the first annular seal ring 15 close to the pin 3. At this time, since the rotating frame 7 will rotate relative to the second clamping part 20 under the condition of unilateral force, A2 will rise under the action of the force, driving the rotating frame 7 to rotate counterclockwise, so that the B2 end of the second annular seal ring 23 will contact the B1 end of the first seal ring 15. Finally, the second annular seal ring 23 and the first annular seal ring 15 are coaxial and then tightly docked. See Figures 7 and 8. Therefore, during the rotation of the two clamping arms, the rotating frame 7 rotates synchronously, so that the two annular seal rings are squeezed in a balanced manner.

[0037] The fresh-keeping machine of this embodiment is provided with a rotatable rotating frame 7 on the clamping part of the second clamping arm 2, and the second annular sealing ring 23 is fixedly arranged on the rotating frame 7. When the clamping parts of the two clamping arms clamp the fresh-keeping bag, after the edge of the annular sealing ring 23 contacts the edge of the first annular sealing ring 15, it can drive the rotating frame 7 to rotate, so that the two annular sealing rings are squeezed in a coaxial posture in a balanced manner, thereby achieving an ideal sealing effect when the fresh-keeping bag is vacuumed.

[0038] In some embodiments, the fresh-keeping machine further comprises a knife assembly 9. The knife assembly 9 comprises a knife seat 93, a knife holder 91 movably connected to the knife seat 93, and a cutting knife 92 provided on the knife holder 91.

[0039] The knife seat 93 is arranged on the gripping part of one of the clamping arms. When the two clamping arms rotate relative to each other so that the gripping part of the other clamping arm is close to the clamping part, the knife holder 91 can be pushed to move relative to the knife seat 93, thereby driving the cutting knife 92 to move so that the fresh-keeping belt can be cut by the cutting knife 92, thereby enabling the fresh-keeping machine to have the function of cutting or opening the bag.

[0040] Preferably, in some embodiments, the knife holder 93 is provided on the first gripping portion 11 of the first clamping arm 1. When the two clamping arms clamp the fresh-keeping bag, the clamping portions of the two clamping arms will be closed or fitted together, so that the knife holder 91 can be pushed to move relative to the knife holder 93 through the second clamping portion 20 to cut the fresh-keeping bag through the cutting knife 92.

[0041] In some embodiments, as shown in Figures 2 and 3, a knife holder 93 is fixed to the exterior of the first grip portion 11. A cutting groove 95 is defined in the knife holder 93, and a knife holder 91 and a spring 94 are respectively located within the interior of the first grip portion 11. The cutting knife 92 extends into the interior of the cutting groove 95 through the first wall thereof. The first end of the spring 94 abuts the knife holder 93, while the other end abuts the knife holder 91, thereby forcing the knife holder 91 to rest against the inner wall of the first grip portion 11. The spring 94 extends and contracts in the same direction as the knife holder 91.

[0042] Furthermore, a through hole is provided on the side of the first gripping portion 11 facing the second gripping portion 21, and the tool holder 91 has a protrusion (not shown in the figure) that passes through the through hole and extends to the outside. In this way, when the user grasps the gripping portions of the two clamping arms to make them fit together, the protrusion can be pushed to drive the tool holder 91 to move and squeeze the spring 94. When the user releases the gripping portion, the protrusion of the tool holder 91 extends to the outside again under the action of the spring 94.

[0043] Furthermore, the cutting groove 95 of this embodiment has a cutting edge (not shown) on its second groove wall, opposite the first groove wall. This cutting edge opposes the blade of the cutting knife 92. The knife holder 91 can drive the cutting knife 92 into the cutting edge. When the opening of the fresh-keeping bag is inserted into the cutting edge, the user can pull the product to cut or open the bag. The provision of the cutting groove 95 not only improves the cutting effect but also prevents the cutting knife 92 from accidentally injuring the user.

[0044] In this way, the front ends of the two clamping arms of the fresh-keeping machine can be used for vacuuming and sealing, and the rear ends can be used for cutting bags, so they are fully utilized.

[0045] As shown in FIG. 2 and FIG. 3 , in some embodiments, the fresh-keeping machine further includes an air pump 4 and an air extraction hole 16 .

[0046] The air pump 4 and the air extraction hole 16 are respectively provided on the first clamping portion 10. The air extraction hole 16 is provided in the area surrounded by the first annular sealing ring 15, and the air pump 4 is connected to the air extraction hole 16. When the two annular sealing rings are tightly attached to form a vacuum zone, the air pump 4 can be used to evacuate the vacuum zone, thereby extracting the air in the fresh-keeping bag, achieving a vacuum effect.

[0047] Preferably, the pump port of the air pump 4 of this embodiment is connected to the air suction nozzle 17, which is used to connect with the air suction hole 16 on the clamping part. The material of the air suction nozzle 17 is preferably soft material, so as to ensure the sealing between the air suction nozzle 17 and the air suction hole 16, and ensure that there is no air leakage when the two are connected.

[0048] As shown in Figures 2 and 3, in some embodiments, the fresh-keeping machine further includes a heater 6 and a pressure strip 5. The heater 6 is disposed on the first clamping portion 10, and the pressure strip 5 is disposed on the second clamping portion 20. When the two clamping portions clamp the fresh-keeping bag, the pressure strip 5 and the heater 6 can be connected together, and the pressure strip 5 presses the portion of the fresh-keeping bag near the bag opening against the heater 6. The heating element 6 then heats the bag to achieve a heat-melt seal, thus providing the fresh-keeping machine with a sealing function.

[0049] Preferably, the shape of the pressure strip 5 of this embodiment is adapted to the shape of the heating element 6 , and a heating wire may be provided inside the heating element 6 , so that the heating element 6 has a heating function by energizing the heating wire.

[0050] The heating element 6 of this embodiment is located on the side of the first annular sealing ring 15 away from the pin 3, so that the fresh-keeping machine can immediately heat and seal the bag opening of the fresh-keeping bag after vacuuming the fresh-keeping belt, thereby improving the convenience of the fresh-keeping machine.

[0051] As shown in Figures 2 and 3, in some embodiments, the first gripping portion 11 of the first clamping arm 1 comprises a gripping base 111 and a gripping cover 110. The gripping cover 110 is buckled onto the gripping base 111 and forms a gripping cavity with the gripping base 111. The gripping cavity houses a battery assembly 13 for powering the air pump 4 and heater 6, respectively, and a circuit board 14 for controlling the operation of the air pump 4 and heater 6, thereby improving space utilization within the gripping portion.

[0052] The circuit board 14 of this embodiment is used to control the operation of the air pump 4 and the heating element 6 respectively. A pressure value Y can be set in the control program on the circuit board 14. When the vacuum pressure value controlled by the circuit board 14 of the air pump 4 reaches the program set value Y, the heat sealing function of the heating element 6 is automatically started, thereby realizing automatic and intelligent operation from vacuuming to sealing.

[0053] As shown in Figures 2 and 3, in some embodiments, the second gripping portion 21 of the second clamping arm 2 includes a gripping lower cover that defines a bottom shell cavity 24. When the gripping portions of the two clamping arms are brought close to each other, the first gripping portion 11 of the first clamping arm 1 can extend into the bottom shell cavity 24. This structure ensures the compactness of the fresh-keeping machine.

[0054] The first clamping part 10 includes a clamping bottom shell 101 and a clamping middle cover 100. The clamping middle cover 100 is buckled on the clamping bottom shell 101 and defines a second cavity with the clamping bottom shell 101. The air pump 4 is arranged in the second cavity, which can make good use of the internal space of the fresh-keeping machine.

[0055] Furthermore, in some embodiments, the second clamping portion 20 includes a clamping upper cover and a fixing frame 8 extending into the clamping upper cover. The clamping upper cover is used to buckle onto the clamping middle cover 100 , and the rotating frame 7 is rotatably connected to the fixing frame 8 via a rotating shaft 22 .

[0056] The first annular sealing ring 15 of this embodiment is fixed on the side of the clamping middle cover 100 facing the fixing frame 8, and the second annular sealing ring 23 is fixed on the fixing frame 8. The heating element 6 is provided on the clamping middle cover 100, and the pressure strip 5 is provided on the fixing frame 8.

[0057] As shown in Figures 2 and 3, in some embodiments, the first gripping portion 11 of the first clamping arm 1 is further provided with a linkage rod assembly 12. The linkage rod assembly 12 is disposed within the gripping cavity, and the linkage rod also has a protruding portion extending externally. The linkage rod assembly 12 is used to control the battery assembly 13 to power on or off the air pump 4 and the heating element 6. When the two clamping arms are rotated and closed, the second gripping portion 21 can push against the protruding portion on the linkage rod assembly 12 to enable the battery assembly 13 to power on the air pump 4 and the heating element 6, respectively. The linkage rod assembly 12 functions as a switch, and its specific structure and working principle belong to the prior art and will not be described in detail in this embodiment.

[0058] The following is a detailed description of the use of the fresh-keeping machine:

[0059] As shown in Figure 4: When the two clamping arms are opened at an angle of α, the fresh-keeping bag can be placed between the two annular sealing rings. When vacuuming and sealing are required, the opening must be closed, that is, the handle is held and a force F1 is applied to the handle. The second clamping arm 2 rotates clockwise around the pin 3, and the first clamping arm 1 rotates counterclockwise around the pin 3. The opening gradually closes and the angle α gradually becomes smaller. According to the lever principle, the force on the front end is marked as F2.

[0060] The closing process of the two clamping arms is shown in Figures 5 and 6: the rear end section of the first annular seal ring 15 is marked as A1, and the front end section is marked as B1; the rear end section of the second annular seal ring 23 is marked as A2, and the front end section is marked as B2. When the two clamping arms are opened at an angle β, A1 contacts A2, and A2 rises under the action of the force, driving the rotating frame 4 and the second annular seal ring 23 to rotate counterclockwise in the fixed frame 8. B2 falls and begins to adjust the balance.

[0061] That is, the fixed frame 8, the rotating frame 5 and the second annular sealing ring 23 form a mechanism for automatically adjusting the sealing balance.

[0062] The two clamping arms are in the closed state, as shown in Figures 7 and 8. Rotation continues until the product is closed. Under the action of force F2, the automatic sealing balance mechanism rotates to a balanced state, with equal forces at both ends, marked as F3. The second annular sealing ring 23 and the first annular sealing ring 15 are squeezed in a balanced manner, achieving an ideal sealing effect. Heat sealing can also be achieved by controlling the heating element 6.

[0063] The above describes in detail several embodiments of the present application, but the present application is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concept of the present application, and these variations and modifications should all fall within the scope of protection claimed by the present application.

Claims

1. A fresh-keeping machine, comprising a first clamping arm (1) and a second clamping arm (2) rotatably connected, wherein a first clamping portion (10) of the first clamping arm (1) is provided with a first annular sealing ring (15), and a second clamping portion (20) of the second clamping arm (2) is provided with a second annular sealing ring (23) opposite to the first annular sealing ring (15), characterized in that: The fresh-keeping machine further comprises a rotating frame (7), wherein the rotating frame (7) is rotatably mounted on the second clamping portion (20), and the second annular sealing ring (23) is fixedly mounted on the rotating frame (7). When the second clamping arm (2) rotates relative to the first clamping arm (1), the rotating frame (7) can rotate relative to the second clamping portion (20), so that the two annular sealing rings can be sealed and docked.

2. A fresh-keeping machine according to claim 1, characterized in that: The fresh-keeping machine also includes a knife assembly (9), which includes a knife seat (93), a knife holder (91) movably connected to the knife seat (93), and a cutting knife (92) provided on the knife holder (91); the knife seat (93) is provided on the first gripping portion (11) of the first clamping arm (1); when the second gripping portion (21) of the second clamping arm (2) is close to the first gripping portion (11) of the first clamping arm (1), the second gripping portion (21) can push the knife holder (91) to move relative to the knife seat (93), so as to cut the fresh-keeping bag through the cutting knife (92).

3. A fresh-keeping machine according to claim 2, characterized in that: The knife holder (93) is provided with a cutting groove (95), the cutting knife (92) extends into the interior of the cutting groove (95) from a first groove wall thereof, a cutting edge is provided on a second groove wall of the cutting groove (95) opposite to the first groove wall, and the knife holder (91) can drive the cutting knife (92) to be inserted into the cutting edge to cut the fresh-keeping bag.

4. A fresh-keeping machine according to claim 2, characterized in that: The fresh-keeping machine further comprises an air pump (4) and an air extraction hole (16), wherein the air pump (4) and the air extraction hole (16) are arranged on the first clamping portion (10), the air extraction hole (16) is arranged in an area surrounded by a first annular sealing ring (15), and the air pump (4) is communicated with the air extraction hole (16).

5. A fresh-keeping machine according to claim 4, characterized in that: The fresh-keeping machine further comprises a heating element (6) and a pressure strip (5), wherein the heating element (6) is arranged on the first clamping portion (10), and the pressure strip (5) is arranged on the second clamping portion (20), and the pressure strip (5) can be pressed against the heating element (6) to clamp the fresh-keeping bag, and the heating element (6) can perform heat-melt sealing on the fresh-keeping bag after being heated.

6. A fresh-keeping machine according to claim 5, characterized in that: The first gripping portion (11) comprises a gripping bottom shell (111) and a gripping upper cover (110), wherein the gripping upper cover (110) is buckled onto the gripping bottom shell (111) and forms a gripping cavity with the gripping bottom shell (111), wherein a battery assembly (13) is provided in the gripping cavity for respectively supplying power to the air pump (4) and the heating element (6).

7. A fresh-keeping machine as claimed in claim 6, characterized in that: The second gripping portion (21) comprises a gripping lower cover, which defines a bottom shell cavity (24). When the gripping portions of the two clamping arms are close to each other, the first gripping portion (11) can extend into the bottom shell cavity (24).

8. The fresh-keeping machine according to claim 5, characterized in that: The first clamping portion (10) comprises a clamping bottom shell (101) and a clamping middle cover (100), wherein the clamping middle cover (100) is buckled onto the clamping bottom shell (101) and defines a second cavity with the clamping bottom shell (101), and the air pump (4) is disposed in the second cavity.

9. A fresh-keeping machine according to claim 8, characterized in that: The second clamping portion (20) includes a clamping upper cover and a fixing frame (8) extending into the clamping upper cover, the rotating frame (7) is rotatably connected to the fixing frame (8), the first annular sealing ring (15) is fixed on the clamping middle cover (100), and the second annular sealing ring (23) is fixed on the fixing frame (8).

10. A fresh-keeping machine according to claim 9, characterized in that: The heating element (6) is arranged on the clamping middle cover (100), and the pressure strip (5) is arranged on the fixing frame (8).

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