Freshness-preserving box

Abstract

The present invention relates to a preservative box. It comprises an inner tube, an outer tube, an upper end cover, and a lower end cover; the inner tube, the outer tube, the upper end cover and the lower end cover together constitute an inner cavity, and the preservative box also comprises a movable spacer, a limit stopper, and a barrier film; the movable spacer divides the inner cavity into an upper cavity and a lower cavity, and the limit stopper is arranged on the inner peripheral wall of the outer tube; the upper and lower ends of the inner tube are both connected to the outside; the lower cavity is filled with preservative microspheres, and the preservative microspheres include a wrapping layer, a preservative and a disintegrant, and the inner tube is provided with a water-passing hole; the barrier film is arranged on the outer periphery of the inner tube and the upper and lower ends are respectively fixedly sealed with the upper end cover and the movable spacer, and the movable spacer is provided with a gas-passing hole, and the gas-passing hole is smaller than the size of the preservative microsphere. The present invention can suspend the slow-release preservative in the upper part of the water body, improve the efficiency of the preservative, and when the preservative is exhausted, the slow-release box can automatically float up, prompting the operator to replace it in time, and has the characteristics of prompting function and convenient operation.

Description

Technical Field

[0001] The invention relates to the field of freshness preservation, in particular to a freshness preservation agent box. Background Art

[0002] At present, fish caught in the deep sea generally need to be stored in water during transportation, sale and before being put into low-temperature freezers. Live fish require clean water, and fresh fish will autolyze and spoil due to the action of microorganisms and endogenous and exogenous enzymes. Therefore, by adding some non-toxic preservatives, the antibacterial and water-retaining effects can be achieved, thereby increasing the freshness of the fish and extending the shelf life of the fresh fish.

[0003] At present, companies mainly achieve the preservation effect by directly spraying preservatives, which increases the cost of using preservatives and reduces the effect and effective time of preservatives. Patent No. CN201821817327.8 discloses "a new type of preservative box", which is mainly used for fruits, vegetables and flowers, but due to its structure and material, it is not suitable for fish preservation. The main reason is that fish are mainly distributed in the middle and upper layers of aqueous solutions. If the preservative only floats on the surface or sinks to the bottom of the water, then the slow release of the preservative will have an obvious concentration gradient distribution in the water, which significantly affects the efficiency of the preservative.

[0004] Moreover, the existing fresh-keeping box cannot accurately judge whether the fresh-keeping agent is consumed during use, and does not have a prompt function. Summary of the invention

[0005] The purpose of the present invention is to overcome the above disadvantages and provide a preservative box, which can be suspended in the upper part of the water body to slowly release the preservative, thereby improving the efficiency of the preservative, and when the preservative is exhausted, the slow-release box can automatically float up to prompt the operator to replace it in time, and has the characteristics of prompt function and easy operation.

[0006] The present invention is realized by the following technical scheme: a preservative box, characterized in that it comprises a hollow inner tube, an outer tube sleeved on the outer circumference of the inner tube, an upper end cover with a sealing cover arranged between the outer tube and the upper end of the inner tube, and a lower end cover which is detachable and connected between the outer tube and the lower end of the inner tube; the outer circumferential wall of the inner tube, the inner circumferential wall of the outer tube, the upper end cover, and the lower end cover together form an annular inner cavity, and the preservative box also comprises a movable spacer, a limit stopper, and a barrier film;

[0007] The movable spacer is movably sleeved between the outer circumferential wall of the inner tube and the inner circumferential wall of the outer tube, dividing the inner cavity into an upper cavity located at the upper layer and a lower cavity located at the lower layer, and the movable spacer can slide up and down in the inner cavity; the limit stopper is fixedly arranged on the inner circumferential wall of the outer tube to limit the upper sliding maximum position of the movable spacer;

[0008] The upper and lower ends of the inner tube are both connected to the outside; the interior of the lower cavity is filled with fresh-keeping microspheres, the fresh-keeping microspheres include an outer wrapping layer and a water-soluble fresh-keeping agent and a disintegrant that can react with water and generate gas filled in the inner cavity of the wrapping layer, and the wrapping layer is made of a material that can slowly release the fresh-keeping agent and disintegrant wrapped in it when in contact with water; the tube wall of the inner tube is also provided with a plurality of water-through holes distributed between the lower limit stopper and the upper part of the lower end cover and penetrating the tube wall of the inner tube so that the lower cavity is connected with the hollow cavity of the inner tube;

[0009] The barrier film is arranged around the outer periphery of the outer peripheral wall of the inner tube, and the upper and lower ends are respectively fixedly sealed and connected to the bottom inner peripheral edge of the upper end cover and the top inner peripheral edge of the movable spacer, and the barrier film can be synchronously stretched downward and block part of the water-through holes on the inner tube or shortened upward and release the water-through holes on the inner tube as the movable spacer moves up and down; the movable spacer is also provided with a plurality of air-through holes that pass through the upper and lower planes to facilitate the gas generated by the reaction of the disintegrant and water to enter the upper cavity, and the aperture of the air-through holes is smaller than the particle size of the fresh-keeping microspheres.

[0010] Its working principle and process are as follows:

[0011] 1. Installation process of the preservative box: turn the sustained-release box over so that the end with the lower end cover faces upward, remove the lower end cover, fill the lower cavity with fresh-keeping microspheres, and the movable spacer slides downward under the action of gravity and is then restricted by the limit block. After the lower cavity is filled, install the upper and lower end covers to complete the installation.

[0012] 2. Working principle of the preservative box: put the end of the sustained-release box with the lower end cover downward into the water. Since the upper cavity stores a certain amount of air, the preservative box has a certain buoyancy, and can be suspended in the middle and upper position of the water body under the action of its own gravity; water can enter the hollow part of the inner tube from the lower end of the inner tube, and flow into the lower cavity through the water through hole on the inner tube to react with the fresh-keeping microspheres. The preservative releases its efficacy outward through the water through hole, and the gas generated by the disintegrant is ventilated to the interior of the upper cavity through the air through hole. The pressure inside the upper cavity gradually increases. Under the action of air pressure, the movable spacer can slide downward relative to the limit stopper and expand the space of the upper cavity downward. At the same time, the movable spacer can drive the barrier film to stretch downward and block part of the water through hole on the inner tube. As the fresh-keeping microspheres are exhausted, the buoyancy of the preservative box increases rapidly, causing the sustained-release box to float automatically, prompting the operator to replace it in time.

[0013] In order to better implement this plan, the following optimization solutions are also provided:

[0014] Preferably, a weight is provided inside the lower end cover for keeping the lower end cover of the preservative box at the bottom in water.

[0015] Preferably, the outer tube includes an upper tube whose upper end is fixedly connected to the bottom of the upper end cover, and a lower tube threadedly connected to the lower end of the upper tube. The limit stopper is arranged on the inner circumferential wall of the upper tube and is located in the upper middle position of the vertical height of the inner cavity.

[0016] Preferably, the inner circumference of the lower end of the upper pipe is provided with an internal thread, and the outer circumference of the upper end of the lower pipe is provided with an external thread that matches and connects with the internal thread of the upper pipe;

[0017] The lower end cover includes a cover body and a cover edge which is arranged on the outer peripheral edge of the cover body and extends upward. The outer periphery of the lower end of the lower connecting pipe is also provided with an external thread, and the inner periphery of the cover edge of the lower end cover is provided with an internal thread which is matched with the external thread of the lower end of the lower connecting pipe. The cover body is also provided with an inner tube through hole which matches the shape and size of the outer peripheral wall of the pipe opening at the lower end of the inner tube. The cover body of the lower end cover is sleeved on the outer periphery of the pipe opening at the lower end of the inner tube, and the cover edge of the lower end cover covers the outer periphery of the pipe opening which is arranged on the lower end of the lower connecting pipe and is matched with the thread.

[0018] Preferably, a hollow filling cavity for filling heavy particles is further provided inside the lower end cover, a filling channel connecting the outside and the filling cavity is provided on the cover body of the lower end cover, and an opening and closing plug for opening and closing the filling channel is also connected to the external opening of the filling channel. During use, the amount of heavy particles in the filling cavity can be manually controlled to adjust the sedimentation height of the preservative box in water. The heavy particles can be sand or steel balls, etc., wherein the opening and closing plug can be a threaded plug threadedly connected to the filling channel, or a wooden plug tightly fitted with the filling channel, etc.

[0019] Preferably, the limit blocks are limit blocks that are distributed in sequence and at intervals along the same circumferential direction surrounding the inner tube, and the number of the limit blocks is 2-6.

[0020] Preferably, the limit stopper is a limit ring arranged around the inner tube along the same circumferential direction.

[0021] Preferably, the wrapping layer is made of a polymer material, the preservative is nisin, and the disintegrant includes polyethylene glycol, and low-substituted hydroxypropyl cellulose, sodium bicarbonate and tartaric acid wrapped by polyethylene glycol.

[0022] Preferably, the wrapping layer is made of polylactic acid.

[0023] Preferably, the barrier film is a plastic film, and the length of the barrier film in the vertical direction is longer than the distance between the upper end cover and the limit stopper. The barrier film can also be made of elastic material, such as rubber film.

[0024] Preferably, the overall shape of the preservative box is cylindrical.

[0025] Compared with the previous technology, the beneficial effects of the present invention are:

[0026] 1. The present invention provides a preservative box, which can be suspended in the upper part of the water body to slowly release the preservative, thereby improving the efficiency of the preservative. When the preservative is exhausted, the slow-release box can automatically float up to prompt the operator to replace it in time. It has the characteristics of prompting function and convenient operation.

[0027] 2. The outer tube in the present invention is formed by threaded connection of an upper tube and a lower tube, which facilitates the assembly and disassembly of the slow-release box.

[0028] 3. In the present invention, a filling cavity is further provided inside the lower end cover, and a filling channel connecting the outside and the filling cavity is opened on the filling cavity. An opening and closing plug for opening and closing the filling channel is also connected to the external opening of the filling channel. Due to the design of the filling cavity, the amount of heavy particles in the filling cavity can be manually controlled during use so as to adjust the sedimentation height of the preservative box in water.

[0029] 4. The present invention also has the advantages of being recyclable, energy-saving and environmentally friendly, and easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The usage status of the first embodiment of the present invention is shown in FIG. Figure 1 ;

[0031] Figure 2 The usage status of the first embodiment of the present invention is shown in FIG. Figure 2 ;

[0032] Figure 3 It is a structural schematic diagram of the movable spacer in the present invention;

[0033] Figure 4 It is a schematic diagram of the structure of the fresh-keeping microspheres in the present invention;

[0034] Figure 5 This is a schematic diagram of the use status of the second embodiment of the present invention.

[0035] Explanation of reference numerals: 1-inner tube, 11-water through hole, 2-outer tube, 21-upper connecting tube, 22-lower connecting tube, 3-upper end cover, 4-lower end cover, 41-cover body, 42-cover edge, 43-perforation of inner tube, 44-filling cavity, 45-filling channel, 46-opening and closing plug, 47-weight block, 5-movable spacer, 51-air through hole, 6-limiting block, 7-barrier film, 8-fresh-keeping microspheres, 81-preservative, 82-disintegrant, 83-wrapping layer, A-inner cavity, A1-upper cavity, A2-lower cavity. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with the accompanying drawings:

[0037] Embodiment 1:

[0038] like Figure 1-4 As shown, a preservative box of the present invention is characterized in that: it comprises a hollow inner tube 1, an outer tube 2 sleeved on the outer circumference of the inner tube 1, an upper end cover 3 with a sealing cover arranged between the outer tube 2 and the upper end of the inner tube 1, and a lower end cover 4 which is detachable and connected between the outer tube 2 and the lower end of the inner tube 1; the outer circumferential wall of the inner tube 1, the inner circumferential wall of the outer tube 2, the upper end cover 3, and the lower end cover 4 together form an annular inner cavity A, and the preservative box also comprises a movable spacer 5, a limit stopper 6, and a barrier film 7;

[0039] The movable spacer 5 is movably sleeved between the outer circumferential wall of the inner tube 1 and the inner circumferential wall of the outer tube 2, dividing the inner cavity A into an upper cavity A1 located at the upper layer and a lower cavity A2 located at the lower layer, and the movable spacer 5 can slide up and down in the inner cavity A; the limit stopper 6 is fixedly arranged on the inner circumferential wall of the outer tube 2 to limit the upper sliding maximum position of the movable spacer 5;

[0040] The upper and lower ends of the inner tube 1 are both connected to the outside; the interior of the lower cavity A2 is filled with fresh-keeping microspheres 8, and the fresh-keeping microspheres 8 include an outer wrapping layer 83 and a water-soluble fresh-keeping agent 81 and a disintegrant that can react with water and generate gas filled in the inner cavity of the wrapping layer 83, and the wrapping layer 83 is made of a material that can slowly release the fresh-keeping agent 81 and the disintegrant wrapped in it when in contact with water; the tube wall of the inner tube 1 is also provided with a plurality of water-through holes 11 distributed between the lower limit stopper 6 and the upper part of the lower end cover 4 and penetrating the tube wall of the inner tube 1 so that the lower cavity A2 is connected with the hollow cavity of the inner tube 1;

[0041] The barrier film 7 is arranged around the outer periphery of the outer wall of the inner tube 1, and the upper and lower ends are respectively fixedly sealed and connected to the bottom inner peripheral edge of the upper end cover 3 and the top inner peripheral edge of the movable spacer 5, and the barrier film 7 can be synchronously stretched downward and block part of the water-through holes 11 on the inner tube 1 or shortened upward and release the water-through holes 11 on the inner tube 1 as the movable spacer 5 moves up and down; the movable spacer 5 is also provided with a plurality of air-through holes 51 that pass through the upper and lower planes to facilitate the gas generated by the reaction of the disintegrant 82 with water to enter the upper cavity A1, and the aperture of the air-through hole 51 is smaller than the particle size of the fresh-keeping microspheres 8.

[0042] Preferably, a weight 47 is provided inside the lower end cover 4 for keeping the lower end cover 4 of the preservative box at the bottom in water.

[0043] Preferably, the outer tube 2 includes an upper tube 21 whose upper end is fixedly connected to the bottom of the upper end cover 3, and a lower tube 22 threadedly connected to the lower end of the upper tube 21, and the limit stopper 6 is arranged on the inner circumferential wall of the upper tube 21 and is located in the upper middle position of the vertical height of the inner cavity A.

[0044] Preferably, the inner circumference of the lower end of the upper pipe 21 is provided with an internal thread, and the outer circumference of the upper end of the lower pipe 22 is provided with an external thread that matches and connects with the internal thread of the upper pipe 21;

[0045] The lower end cover 4 includes a cover body 41 and a cover edge 42 which is arranged on the outer peripheral edge of the cover body 41 and extends upward. The outer periphery of the lower end of the lower connecting pipe 22 is also provided with an external thread, and the inner periphery of the cover edge 42 of the lower end cover 4 is provided with an internal thread which is matched with the external thread at the lower end of the lower connecting pipe 22. The cover body 41 is also provided with an inner tube through hole 43 which matches the shape and size of the outer peripheral wall of the pipe opening at the lower end of the inner tube 1. The cover body 41 of the lower end cover 4 is sleeved on the outer periphery of the pipe opening at the lower end of the inner tube 1, and the cover edge 41 of the lower end cover 4 covers the outer periphery of the pipe opening arranged on the lower end of the lower connecting pipe 22 and is matched with the thread.

[0046] Preferably, the limit blocks 6 are limit blocks that are sequentially spaced apart along the same circumferential direction surrounding the inner tube 1, and the number of the limit blocks is 2-6.

[0047] Preferably, the limit stopper 6 is a limit ring arranged around the inner tube 1 along the same circumferential direction.

[0048] Preferably, the wrapping layer 83 is made of a polymer material, the preservative 81 is nisin, and the disintegrant 82 includes polyethylene glycol, and low-substituted hydroxypropyl cellulose, sodium bicarbonate and tartaric acid wrapped by polyethylene glycol.

[0049] Preferably, the wrapping layer 83 is made of polylactic acid.

[0050] Preferably, the barrier film 7 is a plastic film, and the length of the barrier film 7 in the vertical direction is longer than the distance between the upper end cover 3 and the limit stopper 6. The plastic film is integrally formed of PP plastic, and the barrier film 7 can also be a film made of elastic material, such as a rubber film.

[0051] Preferably, the overall shape of the preservative box is cylindrical.

[0052] Embodiment 2:

[0053] like Figure 5As shown, the difference between this embodiment and the first embodiment is that: a hollow filling cavity 44 for filling heavy particles is further provided inside the lower end cover 4, a filling channel 45 connecting the outside and the filling cavity 44 is provided on the cover body of the lower end cover 4, and an opening and closing plug 46 for opening and closing the filling channel 45 is also connected to the external opening of the filling channel 45. During use, the amount of heavy particles in the filling cavity 44 can be artificially controlled to adjust the sedimentation height of the preservative box in water. The heavy particles can be sand or steel balls, etc., wherein the opening and closing plug 46 can be a threaded plug threadedly connected to the filling channel 45, or a wooden plug tightly fitted with the filling channel 45, etc.

[0054] Although the present invention is illustrated and described by specific embodiments and their alternatives, it should be understood that various changes and modifications within the spirit and scope of the present invention can be implemented. Therefore, it should be understood that the present invention is not limited in any sense except by the limitations of the attached claims and their equivalents.

Claims

1. A preservative box, characterized in that: The preservative box comprises a hollow inner tube (1), an outer tube (2) sleeved on the outer circumference of the inner tube (1), an upper end cover (3) with a sealing cover arranged between the upper end openings of the outer tube (2) and the inner tube (1), and a lower end cover (4) which is detachable and connected between the lower end openings of the outer tube (2) and the inner tube (1); the outer circumferential wall of the inner tube (1), the inner circumferential wall of the outer tube (2), the upper end cover (3), and the lower end cover (4) together form an annular inner cavity (A); the preservative box also comprises a movable spacer (5), a limit stopper (6), and a barrier film (7); The movable spacer (5) is movably sleeved between the outer circumferential wall of the inner tube (1) and the inner circumferential wall of the outer tube (2), dividing the inner cavity (A) into an upper cavity (A1) located at the upper layer and a lower cavity (A2) located at the lower layer, and the movable spacer (5) can slide up and down in the inner cavity (A); the limit stopper (6) is fixedly arranged on the inner circumferential wall of the outer tube (2) to limit the upper sliding maximum position of the movable spacer (5); The upper and lower ends of the inner tube (1) are both connected to the outside; the interior of the lower cavity (A2) is filled with fresh-keeping microspheres (8), the fresh-keeping microspheres (8) comprising an outer wrapping layer (83) and a water-soluble fresh-keeping agent (81) and a disintegrant capable of reacting with water and generating gas filled in the inner cavity of the wrapping layer (83), the wrapping layer (83) being made of a material capable of slowly releasing the fresh-keeping agent (81) and the disintegrant wrapped therein when in contact with water; the wall of the inner tube (1) is also provided with a plurality of water-through holes (11) distributed between the lower limit stopper (6) and the upper part of the lower end cover (4) and penetrating the wall of the inner tube (1) so as to connect the lower cavity (A2) with the hollow cavity of the inner tube (1); The barrier film (7) is arranged around the outer circumference of the outer circumferential wall of the inner tube (1), and the upper and lower ends are respectively fixedly sealed and connected to the bottom inner circumferential edge of the upper end cover (3) and the top inner circumferential edge of the movable spacer (5), and the barrier film (7) can be synchronously stretched downward to block part of the water through holes (11) on the inner tube (1) or shortened upward to release the water through holes (11) on the inner tube (1) as the movable spacer (5) moves up and down; the movable spacer (5) is also provided with a plurality of gas through holes (51) penetrating the upper and lower planes for facilitating the gas generated by the reaction of the disintegrant (82) with water to enter the upper cavity (A1), and the aperture of the gas through holes (51) is smaller than the particle size of the fresh-keeping microspheres (8); A weight (47) is arranged inside the lower end cover (4) for keeping the lower end cover (4) of the preservative box at the bottom in water; The outer tube (2) comprises an upper tube (21) whose upper end is fixedly connected to the bottom of the upper end cover (3), and a lower tube (22) threadedly connected to the lower end of the upper tube (21), and the limit stopper (6) is arranged on the inner peripheral wall of the upper tube (21) and is located at the upper middle position of the vertical height of the inner cavity (A).

2. The preservative box according to claim 1, characterized in that: The inner circumference of the lower end of the upper pipe (21) is provided with an internal thread, and the outer circumference of the upper end of the lower pipe (22) is provided with an external thread that matches and connects with the internal thread of the upper pipe (21); The lower end cover (4) comprises a cover body (41) and a cover edge (42) arranged around the outer peripheral edge of the cover body (41) and extending upward. The outer peripheral edge of the lower end of the lower connecting pipe (22) is also provided with an external thread, and the inner peripheral edge of the cover edge (42) of the lower end cover (4) is provided with an internal thread that is matched and connected with the external thread of the lower end of the lower connecting pipe (22). The cover body (41) is also provided with an inner tube through hole (43) that matches the shape and size of the outer peripheral wall of the tube opening at the lower end of the inner tube (1). The cover body (41) of the lower end cover (4) is sleeved on the outer peripheral edge of the tube opening at the lower end of the inner tube (1), and the cover edge (42) of the lower end cover (4) covers the outer peripheral edge of the tube opening arranged around the lower end of the lower connecting pipe (22) and is matched and connected with the thread.

3. The preservative box according to claim 1, characterized in that: The lower end cover (4) is also provided with a hollow filling cavity (44) for filling heavy particles, and the cover body of the lower end cover (4) is provided with a filling channel (45) connecting the outside and the filling cavity (44), and the outer opening of the filling channel (45) is also connected to an opening and closing plug (46) for opening and closing the filling channel (45).

4. The preservative box according to claim 1, characterized in that: The limit blocks (6) are limit blocks that are sequentially spaced and distributed along the same circumferential direction surrounding the inner tube (1), and the number of the limit blocks is 2-6.

5. The preservative box according to claim 1, characterized in that: The limit stopper (6) is a limit ring arranged around the inner tube (1) in the same circumferential direction.

6. The preservative box according to claim 1, characterized in that: The wrapping layer (83) is made of a polymer material, the preservative (81) is nisin, and the disintegrant (82) includes polyethylene glycol, and low-substituted hydroxypropyl cellulose, sodium bicarbonate and tartaric acid wrapped by polyethylene glycol.

7. The preservative box according to claim 1, characterized in that: The wrapping layer (83) is made of polylactic acid.

8. The preservative box according to claim 1, characterized in that: The barrier film (7) is a plastic film, and the length of the barrier film (7) in the vertical direction is longer than the distance between the upper end cover (3) and the limit stopper (6).

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