Negative pressure generator and vacuum storage box

Abstract

The present invention discloses a negative pressure generator and a vacuum fresh-keeping container. The negative pressure generator comprises: a cover; an elastic sealing gasket disposed on the cover, the elastic sealing gasket having a guide post with a torsion groove; and a knob structure mounted on the cover and drivingly connected to the torsion groove. The knob structure rotates to move the guide post, and the movement of the guide post deforms the elastic sealing gasket. The negative pressure generator and vacuum fresh-keeping container provided by the present invention effectively solve the problem of complex operation of vacuum fresh-keeping containers in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh-keeping boxes, and in particular to a negative pressure generator and a vacuum fresh-keeping box. Background Art

[0002] With the continuous progress of society and the continuous improvement of people's living standards, fresh-keeping boxes, as a new and convenient fresh-keeping device, are increasingly being used by people and have entered the daily lives of more and more people. Existing vacuum fresh-keeping boxes generally use a vacuum pump to extract the air inside the box to reduce the vacuum degree of the fresh-keeping box, thereby achieving the purpose of fresh-keeping.

[0003] There's a vacuum food storage container on the market with an elastic lid and a one-way exhaust valve. To operate, the user manually presses the lid repeatedly to expel air from the container through the one-way exhaust valve, creating a vacuum. However, the lid itself, which serves as a protective layer, is relatively hard and relatively inelastic, requiring multiple presses. This makes the operation complex and inconvenient.

[0004] There is also a vacuum fresh-keeping box on the market, which includes a fresh-keeping box body and a fresh-keeping box lid sealed on the opening of the fresh-keeping box body. The fresh-keeping box lid is composed of a top shell and a bottom shell fixedly buckled together. The surface of the top shell is provided with an air inlet penetrating the top shell, and the bottom of the bottom shell is provided with an air extraction guide hole and an air intake guide hole penetrating the bottom shell. The air intake guide hole extends upward to the air inlet, and an air extraction hole plug is provided at the bottom of the air extraction guide hole, a sealing ring is provided at the top of the air extraction guide hole, and a manual vacuum device is sealed and connected to the top of the air extraction guide hole. Each vacuuming requires continuous reciprocating operation of the air pump handle, which is complicated to operate and has low vacuuming efficiency.

[0005] In summary, the vacuum fresh-keeping box in the prior art has the problem of complicated operation. Summary of the Invention

[0006] The embodiments of the present invention provide a negative pressure generator and a vacuum fresh-keeping container to solve the problem of complicated operation of the vacuum fresh-keeping container in the prior art.

[0007] To achieve the above-mentioned purpose, the present invention provides a negative pressure generator, comprising: a cover body; an elastic sealing pad, the elastic sealing pad is arranged on the cover body, the elastic sealing pad has a guide column, and the guide column has a torsion groove; a knob structure, the knob structure is installed on the cover body, the knob structure is driven and connected to the torsion groove, the knob structure drives the guide column to move by rotation, and the movement of the guide column causes the elastic sealing pad to deform.

[0008] Furthermore, the knob structure includes: a torsion component, a slider structure is provided on the torsion component, the slider structure is assembled in the torsion groove and driven to cooperate, and when the torsion component rotates, the guide column is driven to move through the slider structure; a knob, the knob is driven and connected to the torsion component through a transmission mechanism, and the knob drives the torsion component to rotate through the transmission mechanism.

[0009] Furthermore, the torsion component is provided with transmission teeth; the transmission mechanism is a gear set, the knob is drivingly connected to the transmission mechanism, and the transmission mechanism is engaged with the torsion component through the transmission teeth.

[0010] Furthermore, the gear set includes: a first gear, the first gear is connected to the knob, and the first gear rotates synchronously with the knob; a second gear, the second gear is meshed with the first gear; the transmission tooth is an inner ring gear, and the second gear is meshed with the inner ring gear.

[0011] Furthermore, the torsion component has a driving through hole, the guide column is arranged in the driving through hole, and the slider structure is located on the inner wall of the driving through hole.

[0012] Furthermore, the interior of the cover body has an installation space, and the torsion component and the transmission mechanism are located in the installation space; the cover body is provided with a guide through hole, and the guide column passes through the guide through hole and is penetrated in the drive through hole.

[0013] Furthermore, a guide protrusion is provided on the inner wall of the guide through hole, a guide groove is provided on the guide column, and the guide protrusion is located in the guide groove and is limitedly matched with the guide groove.

[0014] Furthermore, the first end of the guide column is located in the installation space, the second end of the guide column is located outside the cover body, and the torsion component drives the guide column to move in a direction from the outside of the cover body to the inside of the installation space; an elastic return member is connected between the second end of the guide column and the cover body, and the elastic force direction of the elastic return member is from the inside of the installation space to the outside of the cover body.

[0015] Furthermore, the torsion groove has a starting end and an end end. During the sliding process of the slider structure from the starting end to the end end of the torsion groove, the guide column moves from the outside of the cover body to the inside of the installation space; the guide column is also provided with a disassembly groove for the slider structure to slide out, the first end of the disassembly groove is connected to the end end of the torsion groove, and the second end of the disassembly groove is located at the first end of the guide column and forms a sliding outlet.

[0016] Furthermore, a limiting groove is provided at the end point of the torsion groove, and the limiting groove is connected to the torsion groove; the slider structure can slide into the limiting groove when it slides to the end point of the torsion groove, and under the action of the elastic return member, a limiting fit is formed between the slider structure and the guide column.

[0017] Furthermore, the elastic sealing pad includes a main pad structure, which is located outside the cover body; the second end of the guide column is connected to the main pad structure, and the movement of the guide column drives the main pad structure to deform.

[0018] Furthermore, the cover body includes an upper cover and a base that are buckled together, the upper cover and the base form an installation space, the knob is passed through the upper cover, and a guide through hole is opened on the base.

[0019] According to another aspect of the present invention, a vacuum fresh-keeping container is provided, comprising the above-mentioned negative pressure generator.

[0020] Furthermore, the vacuum fresh-keeping box includes a box cover and a box body. The box cover is arranged on the box body. The box cover includes a negative pressure generator. When the box cover is arranged on the box body, the elastic sealing pad and the interior of the box body form a storage space.

[0021] The negative pressure generator is used to be installed on a vacuum fresh-keeping box. The elastic sealing pad and the internal structure of the fresh-keeping box form a storage space. The deformation of the elastic sealing pad can increase the internal volume of the vacuum fresh-keeping box. Since the interior of the vacuum fresh-keeping box is in a sealed state, the air quality inside the box remains unchanged. When the internal volume increases, the density of the air decreases, that is, the air pressure inside the fresh-keeping box decreases, and the vacuum degree decreases accordingly. The negative pressure generator of the present invention is designed with a knob structure. By rotating the knob structure, the guide post moves, and the guide post moves and causes the elastic sealing pad to deform. The volume of the box increases with the rotation of the knob. The deformation of the elastic sealing pad causes the vacuum degree of the vacuum fresh-keeping box to decrease as the volume increases, thereby completing the vacuuming operation. Compared with the repeated operation of the exhaust valve or the air extraction hole in the prior art, the negative pressure generator of the present invention only needs to rotate the knob structure to complete the vacuuming operation. The operation is very simple, easy to use, and the vacuuming effect is good and the vacuuming efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 1 is a schematic diagram of the internal structure of a negative pressure generator according to an embodiment of the present invention;

[0023] Figure 2 2 is a schematic diagram of the structure coordination of the transmission mechanism of the negative pressure generator according to an embodiment of the present invention;

[0024] Figure 3 1 is a schematic diagram of the structural decomposition of a negative pressure generator according to an embodiment of the present invention;

[0025] Figure 4 yes Figure 1 Schematic diagram of the structural coordination of the base and guide column of the negative pressure generator;

[0026] Figure 5 yes Figure 1 A schematic structural diagram of an elastic sealing member of a negative pressure generator;

[0027] Figure 6 yes Figure 5 A schematic structural diagram of a guide column;

[0028] Figure 7 yes Figure 1 Schematic diagram of the structural coordination of the guide column and guide groove of the negative pressure generator;

[0029] Figure 8 yes Figure 1 A schematic structural diagram of a torsional component of a negative pressure generator;

[0030] Figure 9 2 is a schematic structural diagram of a vacuum fresh-keeping container according to an embodiment of the present invention;

[0031] Figure 10 1 is a diagram showing changes in volume and air pressure of a vacuum fresh-keeping container according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0033] See also Figures 1 to 8 As shown, according to an embodiment of the present invention, a negative pressure generator is provided. The negative pressure generator includes a cover 10, an elastic sealing gasket 20, and a knob structure 30. The elastic sealing gasket 20 is disposed on the cover 10 and has a guide post 21 with a torsion groove 21a therein. The knob structure 30 is mounted on the cover 10 and is drivingly connected to the torsion groove 21a. The knob structure 30 rotates to move the guide post 21, and the movement of the guide post 21 deforms the elastic sealing gasket 20. The elastic sealing gasket 20 can be a silicone gasket or a rubber gasket.

[0034] The negative pressure generator is used to be installed on a vacuum fresh-keeping box. The elastic sealing pad and the internal structure of the fresh-keeping box form a storage space. The deformation of the elastic sealing pad can increase the internal volume of the vacuum fresh-keeping box. Since the interior of the vacuum fresh-keeping box is in a sealed state, the air quality inside the box remains unchanged. When the internal volume increases, the density of the air decreases, that is, the air pressure inside the fresh-keeping box decreases, and the vacuum degree decreases accordingly. The negative pressure generator of the present invention is designed with a knob structure. By rotating the knob structure, the guide column 21 is driven to move. The guide column 21 moves and drives the elastic sealing pad 20 to deform. The volume of the box increases with the rotation of the knob. The deformation of the elastic sealing pad 20 causes the vacuum degree of the vacuum fresh-keeping box to decrease as the volume increases, thereby completing the vacuuming operation. Compared with the repeated operation of the exhaust valve or the air extraction hole in the prior art, the negative pressure generator of the present invention only needs to rotate the knob structure to complete the vacuuming operation. It is very simple to operate, convenient to use, has a good vacuuming effect, and is more efficient.

[0035] Combine Figure 2 and Figure 8 As shown, the knob structure 30 includes a torsion component 31 and a knob 32. The torsion component 31 is provided with a slider structure 31a. The slider structure 31a is assembled and driven in the torsion groove 21a. When the torsion component 31 rotates, the slider structure 31a drives the guide column 21 to move. The knob 32 is connected to the torsion component 31 through a transmission mechanism, which drives the torsion component 31 to rotate. The knob structure 30 is fixed to the cover body 10. When the torsion component 31 rotates, the slider structure 31a is driven and engaged with the torsion groove 21a during the rotation process. Because the guide column is movable, the force applied by the rotation of the slider structure 31a causes the guide column to move, thereby pulling the elastic sealing gasket 20 to deform. The knob 32 is a structure that allows users to operate it and has a normal knob shape. The transmission mechanism can be selected according to specific needs, and the transmission mechanism is mainly based on energy-saving transmission.

[0036] Preferably, the torsion member 31 is provided with transmission teeth 31b; the transmission mechanism is a gear set, and the knob 32 is drivingly connected to the transmission mechanism, which meshes with the torsion member 31 via the transmission teeth 31b. In this embodiment, the gear set and transmission teeth 31b are used to achieve torque transmission, and the gear train transmission is a very efficient and labor-saving structural combination.

[0037] The gear set of the negative pressure generator in this embodiment includes a first gear 41 and a second gear 42. The first gear 41 is connected to the knob 32 and rotates synchronously with the knob 32. The second gear 42 meshes with the first gear 41. The transmission gear 31b is an inner ring gear, and the second gear 42 meshes with the inner ring gear. The first gear 41 is mounted on the bottom of the knob 32, and the first gear and the inner ring gear are coaxial. In this embodiment, there are four second gears, which are mounted on the support base and evenly distributed around the periphery of the first gear to achieve transmission. Figure 2 The first gear, the second gear, and the inner ring gear are meshed with each other to form a gear train. When the user twists the knob counterclockwise, the first gear and the second gear rotate and cause the inner ring gear to rotate clockwise, thereby driving the torsion component to rotate clockwise.

[0038] The torsion component 31 has a driving through hole 311, the guide column 21 is disposed in the driving through hole 311, and the slider structure 31a is located on the inner wall of the driving through hole 311. In this embodiment, the driving through hole 311 is located inside the inner gear ring, and the driving through hole 311 and the inner gear ring are collinear. There are two slider structures 31a and they are symmetrically disposed on the inner wall of the driving through hole 311. The slider structures 31a and the torsion component 31 are integrally formed. For details, see Figure 2 and Figure 8Through the above structural design, the rotation trajectory of the slider structure 31a is clear, corresponding to the rotation of the knob, and can quickly complete the transmission. The cooperation between the driving through hole 311 and the guide column 21 can also make the structural cooperation more stable.

[0039] Combine Figure 1 and Figure 3 As shown, the cover 10 has an interior installation space 101, within which the torsion component 31 and the transmission mechanism are located. A guide hole 102 is provided on the cover 10, through which the guide post 21 passes and is disposed within the drive hole 311. In other words, one end of the guide post 21 is within the installation space 101, while the other end is external to the cover. The guide post's movement is along the axis of the guide hole (in both directions of the axis). The guide hole serves to limit the direction of movement of the guide post 21, making the deformation of the elastic sealing gasket more controllable and the deformation amount digitized, facilitating the determination of the dimensions of each component during manufacturing.

[0040] like Figure 7 As shown, a guide protrusion 51 is provided on the inner wall of the guide through hole 102, and a guide groove 52 is provided on the guide column 21. The guide protrusion 51 is located in the guide groove 52 and is limitedly engaged with the guide groove 52. The cooperation between the guide protrusion 51 and the guide groove 52 can make the movement of the guide column more stable. The guide groove 52 is a linear groove.

[0041] The first end of the guide post 21 is located in the installation space 101, and the second end of the guide post 21 is located outside the cover 10. The torsion component 31 drives the guide post 21 to move from the outside of the cover 10 to the inside of the installation space 101. An elastic return member 60 is connected between the second end of the guide post 21 and the cover 10. The elastic direction of the elastic return member 60 is from the inside of the installation space 101 to the outside of the cover 10. Figure 1 and Figure 3 As the guide post 21 moves from the exterior of the cover 10 toward the interior of the installation space 101, the elastic sealing gasket deforms. To relieve the negative pressure, the knob is rotated in the opposite direction, and the elastic return member 60 assists in returning the elastic sealing gasket to its initial position. The elastic return member 60 is a spring. A mounting step is formed at the second end of the guide post 21. One end of the spring is connected to the mounting step, and the other end abuts against the exterior surface of the cover.

[0042] See also Figure 6The torsion groove 21a has a starting end G1 and an end end G2. When the slider structure 31a slides from the starting end G1 of the torsion groove 21a to the end end G2, the guide column 21 moves from the outside of the cover body 10 to the inside of the installation space 101. The guide column 21 is also provided with a disassembly groove 21b for the slider structure 31a to slide out. The first end of the disassembly groove 21b is connected to the end end G2 of the torsion groove 21a. The second end of the disassembly groove 21b is located at the first end of the guide column 21 and forms a sliding opening 21d. The purpose of providing the disassembly groove 21b is to allow the elastic sealing gasket to be removed. The specific operation is: first, you can twist the knob counterclockwise to complete the state of pulling up the elastic sealing gasket (i.e., deforming it). At this time, press the elastic sealing gasket inward with your hand while continuing to rotate the knob counterclockwise. The slider structure enters the disassembly groove 21b from the end end G2 and then slides out from the sliding opening 21d, so that the elastic sealing gasket is removed and the purpose of disassembly is achieved.

[0043] When the user needs to cancel the negative pressure, by twisting the knob, the slider structure starts to slide along the inclined surface of the torsion groove from the end end G2 to the starting end G1. At this time, the knob and the elastic sealing gasket return to their original position and lose the expansion negative pressure and sealing functions, and the user can open the vacuum storage box.

[0044] In order to optimize the structure of vacuum locking, in this embodiment, a limiting groove 21c is provided at the end point G2 of the torsion groove 21a, and the limiting groove 21c is connected to the torsion groove 21a; the slider structure 31a can slide into the limiting groove 21c when it slides to the end point G2 of the torsion groove 21a, and under the action of the elastic return member 60, a limiting fit is formed between the slider structure 31a and the guide column 21.

[0045] When the user needs to vacuum the container, they twist the knob, causing the slider structure to slide from its starting point G1 along the inclined surface of the torsion groove to its end point G2. At this point, the elastic sealing gasket deforms to achieve the effect of expanding the negative pressure, and the slider structure 31a slides into the limiting groove 21c at the end point G2 of the torsion groove 21a. After the user stops operating the knob, the elastic return member 60 causes the slider structure 31a to abut against the limiting groove 21c and retain the position, thereby forming a limiting fit between the slider structure 31a and the guide post 21. In other words, without the need for other locking structures, the elastic return member and the limiting groove can cooperate to maintain the elastic sealing gasket's deformation, completing the self-locking function and ensuring a stable vacuum level in the vacuum container.

[0046] The elastic sealing gasket 20 includes a main gasket structure 22, which is located outside the cover 10. The second end of the guide post 21 is connected to the main gasket structure 22, and the movement of the guide post 21 causes the main gasket structure 22 to deform. The main gasket structure is connected to the cover at its edge and is circular in shape. The guide post is located at the center of the main gasket structure, and the guide post pulls the main gasket structure from the center to deform it. The circular design of the main gasket structure ensures uniform contraction during deformation, but the shape of the main gasket is not limited to square or oval.

[0047] Combine Figure 1 and Figure 2 As shown, the cover body 10 includes an upper cover 11 and a base 12 that are interlocked. The upper cover 11 and the base 12 enclose an installation space 101. The knob 32 is passed through the upper cover 11, and a guide hole 102 is provided on the base 12. The upper cover 11 and the base 12 are fastened by snaps and assembled into place by a positioning structure. The support seat for installing the second gear is snapped onto the base 12, and the positioning structure ensures that the two are assembled into place. The upper cover 11 and the base 12 are provided with anti-foolproof prompts or anti-foolproof designs. The anti-foolproof prompts can be provided by pattern prompts (such as the alignment of the tips of two triangles, or other patterns) to ensure that the installation of the upper cover 11 and the base 12 is convenient and quick, thereby improving production and assembly efficiency.

[0048] The present invention also provides an embodiment of a vacuum fresh-keeping box, which includes the negative pressure generator of the above embodiment.

[0049] A negative pressure generator is installed on a vacuum fresh-keeping box. An elastic sealing pad and the internal structure of the vacuum fresh-keeping box form a storage space. The deformation of the elastic sealing pad can increase the internal volume of the vacuum fresh-keeping box. Since the interior of the vacuum fresh-keeping box is in a sealed state, the air quality inside the box remains unchanged. When the internal volume increases, the density of the air decreases, that is, the air pressure inside the fresh-keeping box decreases, and the vacuum degree decreases accordingly. The negative pressure generator is designed with a knob structure. By rotating the knob structure, the guide post moves, and the guide post moves and causes the elastic sealing pad to deform. The volume of the box increases with the rotation of the knob. The deformation of the elastic sealing pad causes the vacuum degree of the vacuum fresh-keeping box to decrease as the volume increases, thereby completing the vacuuming operation. Compared with the repeated operation through the exhaust valve or the air extraction hole in the prior art, the vacuum fresh-keeping box of the present invention only needs to rotate the knob structure to complete the vacuuming operation. The operation is very simple, easy to use, and the vacuuming effect is good and the vacuuming efficiency is higher.

[0050] As a vacuum preservation box used in the refrigerator, after being placed in the refrigerator's cold storage compartment, the vacuum degree can continue to decrease as the temperature drops, ensuring that the preservation box has a good vacuum preservation effect.

[0051] See also Figure 9The vacuum fresh-keeping box includes a box cover 71 and a box body 72. The box cover 71 is arranged on the box body 72. The box cover 71 includes a negative pressure generator. When the box cover 71 is arranged on the box body 72, the elastic sealing pad 20 and the interior of the box body 72 form a storage space.

[0052] After the user rotates the knob, the guide column of the elastic sealing gasket is pulled up through the action of the transmission mechanism system, and the guide column drives the elastic sealing gasket to move upward. Since the elastic sealing gasket is locked by the atmospheric pressure on all sides, the elastic sealing gasket is pulled up to produce elastic deformation and present a frustum shape. Compared with the initial state, the internal volume of the vacuum preservation box is expanded, and its expanded volume is similar to a frustum. Since the interior of the vacuum preservation box is in a sealed state, the air quality inside the box remains unchanged; since the vacuum degree in the box decreases as the air density decreases, and the air density decreases as the volume increases, the vacuum degree decreases as the volume increases. The volume change shown in Table 1, the volume and air pressure changes shown in Table 2, combined with Figure 10 The figure shows how the vacuum level changes when the box contains items of different volumes. It can be seen that when the volume of the box reaches 85%, the vacuum level reaches 0.878. Since this vacuum preservation box is used in the refrigerator, the vacuum level can be further reduced to around 0.8 as the temperature drops, thus achieving the vacuum preservation function.

[0053] Table 1:

[0054] Box volume Expand capacity 4410 91.5

[0055] Table 2:

[0056] The volume of the items in the box Remaining volume in the box Air pressure reached after expansion 0％ 100％ 0.980 50％ 50％ 0.960 70％ 30％ 0.935 75％ 25％ 0.923 80％ 20％ 0.906 85％ 15％ 0.878 90％ 10％ 0.828

[0057] The assembly requirements of the vacuum container are as follows:

[0058] First, the box body and the box cover need to be installed in place to ensure that the elastic sealing gasket can be clamped under force to ensure the sealing inside the box.

[0059] Secondly, all the structures in the negative pressure generator need to be installed in place to ensure that the elastic sealing gasket can be pulled up by force and ensure its linkage;

[0060] Finally, the elastic recovery piece needs to be installed in place to ensure that it can assist the elastic sealing gasket in rebounding and completing the locking.

[0061] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0062] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0063] Of course, the above are preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the basic principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A negative pressure generator, characterized in that: include: Cover (10); An elastic sealing gasket (20), the elastic sealing gasket (20) being arranged on the cover body (10), the elastic sealing gasket (20) having a guide column (21), the guide column (21) having a torsion groove (21a); ​​the elastic sealing gasket (20) comprising a main gasket structure (22), the main gasket structure (22) being located outside the cover body (10); the second end of the guide column (21) being connected to the main gasket structure (22); A knob structure (30), the knob structure (30) being mounted on the cover body (10), the knob structure (30) being drivingly connected to the torsion groove (21a), the knob structure (30) driving the guide column (21) to move by rotating, and the movement of the guide column (21) driving the deformation of the main pad structure (22); The negative pressure generator is used for a vacuum fresh-keeping box, which comprises a box cover (71) and a box body (72). The box cover (71) is arranged on the box body (72). The box cover (71) is provided with the negative pressure generator. When the box cover (71) is arranged on the box body (72), the elastic sealing pad (20) and the interior of the box body (72) form a storage space.

2. The negative pressure generator according to claim 1, characterized in that The knob structure (30) comprises: A torsion component (31), wherein a slider structure (31a) is provided on the torsion component (31), and the slider structure (31a) is assembled in the torsion groove (21a) and driven to cooperate, and when the torsion component (31) rotates, the slider structure (31a) drives the guide column (21) to move; A knob (32) is drivingly connected to the torsion component (31) via a transmission mechanism, and the knob (32) drives the torsion component (31) to rotate via the transmission mechanism.

3. The negative pressure generator according to claim 2, characterized in that: The torsion component (31) is provided with a transmission tooth (31b); The transmission mechanism is a gear set, the knob (32) is drivingly connected to the transmission mechanism, and the transmission mechanism is meshed with the torsion component (31) via the transmission teeth (31b).

4. The negative pressure generator according to claim 3, characterized in that: The gear set includes: a first gear (41), the first gear (41) being connected to the knob (32), and the first gear (41) and the knob (32) rotating synchronously; a second gear (42), the second gear (42) being meshed with the first gear (41); The transmission tooth (31b) is an inner gear ring, and the second gear (42) is meshed with the inner gear ring.

5. The negative pressure generator according to claim 2 or 4, characterized in that: The torsion component (31) has a driving through hole (311), the guide column (21) is arranged in the driving through hole (311), and the slider structure (31a) is located on the inner wall of the driving through hole (311).

6. The negative pressure generator according to claim 5, characterized in that: The cover body (10) has an installation space (101) inside, and the torsion component (31) and the transmission mechanism are located in the installation space (101); A guide through hole (102) is provided on the cover body (10), and the guide column (21) passes through the guide through hole (102) and is arranged in the driving through hole (311).

7. The negative pressure generator according to claim 6, characterized in that: A guide protrusion (51) is provided on the inner wall of the guide through hole (102), a guide groove (52) is provided on the guide column (21), and the guide protrusion (51) is located in the guide groove (52) and is limitedly engaged with the guide groove (52).

8. The negative pressure generator according to claim 7, characterized in that: The first end of the guide column (21) is located in the installation space (101), the second end of the guide column (21) is located outside the cover body (10), and the torsion component (31) drives the guide column (21) to move in a direction from the outside of the cover body (10) to the inside of the installation space (101); An elastic return member (60) is connected between the second end of the guide column (21) and the cover body (10), and the elastic force direction of the elastic return member (60) is from the inside of the installation space (101) to the outside of the cover body (10).

9. The negative pressure generator according to claim 8, characterized in that: The torsion groove (21a) has a starting end (G1) and an ending end (G2); when the slider structure (31a) slides from the starting end (G1) to the ending end (G2) of the torsion groove (21a), the guide column (21) moves from the outside of the cover body (10) toward the inside of the installation space (101); The guide column (21) is further provided with a disassembly groove (21b) for the slider structure (31a) to slide out, the first end of the disassembly groove (21b) is connected to the terminal end (G2) of the torsion groove (21a), and the second end of the disassembly groove (21b) is located at the first end of the guide column (21) and forms a sliding outlet (21d).

10. The negative pressure generator according to claim 8 or 9, characterized in that: A limiting groove (21c) is provided at the terminal end (G2) of the torsion groove (21a), and the limiting groove (21c) is connected to the torsion groove (21a); The slider structure (31a) can slide into the limiting groove (21c) when it slides to the end end (G2) of the torsion groove (21a), and under the action of the elastic return member (60), a limiting fit is formed between the slider structure (31a) and the guide column (21).

11. The negative pressure generator according to claim 6, characterized in that: The cover body (10) comprises an upper cover (11) and a base (12) that are engaged with each other, wherein the upper cover (11) and the base (12) enclose an installation space (101), the knob (32) is passed through the upper cover (11), and the base (12) is provided with the guide through hole (102).

12. A vacuum fresh-keeping box, characterized in that: The negative pressure generator comprises the negative pressure generator according to any one of claims 1 to 11.

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