Gas-liquid compound sample injection spraying mechanism and fruit and vegetable decompression fresh-keeping equipment

Abstract

The invention relates to the technical field of fruit and vegetable fresh-keeping, in particular to a gas-liquid compound sample introduction spraying mechanism and fruit and vegetable pressure reduction fresh-keeping equipment, which comprises a liquid mixing pumping device, a spray head, a gas mixing device and a gas circulator, the liquid mixing and pumping device is used for uniformly mixing two or more liquids and pumping the liquids to the spraying head through the first pipeline to be sprayed out; the gas mixer is used for uniformly mixing two or more gases and conveying the gases into the fresh-keeping bin through a second pipeline; the gas circulator is arranged in the fresh-keeping bin and ascends and descends through a lifting component, and an air outlet of the gas circulator faces fog drops sprayed by the spraying head; a wind shield is arranged at the position of an air inlet of the air circulator in a sliding mode, and the wind shield is used for adjusting the air inflow of the air inlet of the air circulator. One set of equipment can realize two fresh-keeping modes of gas fresh-keeping and liquid fresh-keeping.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fruit and vegetable preservation, in particular to a gas-liquid compound sampling spraying mechanism and a fruit and vegetable pressure reduction preservation equipment. BACKGROUND

[0002] Fruits and vegetables are the core products in the global agricultural and food supply chain, and their postharvest loss problems have long hindered the industry's efficiency and food safety. According to the Food and Agriculture Organization (FAO) of the United Nations, about 14% of fruits and vegetables are lost annually due to rotting, water loss, or quality deterioration during the postharvest stage, and this proportion in developing countries is as high as 30%-50%. Traditional preservation methods (such as normal temperature storage and simple refrigeration) can partially delay spoilage, but they have short preservation periods, rapid nutrient loss, and decreased commodity value, making it difficult to meet the demand for high-quality fruits and vegetables in modern consumer markets. Therefore, developing efficient and environmentally friendly fruit and vegetable preservation technologies has become a key research direction in the field of agricultural science and technology.

[0003] Currently, fruit and vegetable preservation technologies mainly focus on inhibiting respiration, controlling microbial growth, and reducing water loss, and can be divided into two categories based on their mechanisms: First, liquid spraying combined with a reduced pressure environment, which works by spraying natural or synthetic preservative liquids (such as chitosan solution, calcium salt solution, and plant essential oils) onto the surface of fruits and vegetables to form a protective film, blocking the direct contact between oxygen and fruits and vegetables, and accelerating liquid penetration and strengthening the absorption of preservative components in a reduced pressure environment (such as vacuum or low pressure conditions).

[0004] Second, gas regulation combined with a reduced pressure environment, which works by introducing inert or inhibitory gases such as nitrogen (N2) and carbon dioxide (CO2) into the storage environment to reduce the concentration of oxygen (O2), inhibit the respiration of fruits and vegetables, and accelerate gas exchange in a reduced pressure environment, achieving more precise gas regulation.

[0005] The current fruit and vegetable preservation equipment market has significant technical applicability limitations, which is specifically manifested in the strong correlation between different types of equipment and the characteristics of fruits and vegetables. Liquid preservation equipment (such as chitosan coating machine, calcium salt spraying cabin) mainly relies on the physical or chemical barrier formed by the preservation liquid on the surface of fruits and vegetables to block oxygen and inhibit microorganisms, so it is only suitable for categories with dense skin structure and strong liquid resistance, such as apples, citrus and other hard fruits and vegetables. For example, hard fruits and vegetables such as apples, citrus and other hard fruits and vegetables can strengthen the cell wall by spraying calcium salt, and berries such as strawberries and blueberries can reduce rot by chitosan coating. However, if used for leafy vegetables, liquid can cause leaf adhesion and rot, and if used for mangoes, bananas and other respiratory fruits, the skin may be closed, which can accelerate the accumulation of internal ethanol and cause odor. On the contrary, gas preservation equipment (such as controlled atmosphere storage and reduced pressure storage cabin) can inhibit respiration by adjusting the O2 / CO2 concentration, which is more suitable for thin-skinned or high-respiration-intensity fruits and vegetables, such as lettuce and spinach, which can delay wilting in low O2 (1%-3%) environment, and kiwi and pear can inhibit ethylene synthesis by high CO2 (5%-10%). However, if used for fruits and vegetables with thick skin and developed wax layer (such as grapefruit and coconut), the gas regulation effect will be significantly weakened. This "technology-category" single matching mode leads to the need for independent equipment for different characteristics of fruits and vegetables, which greatly increases the storage cost and operational complexity of the supply chain. In addition, for the current liquid spraying preservation equipment, the mist sprayed by the atomizing nozzle is affected by gravity and nozzle angle, and is prone to form local accumulation (such as concave parts) or insufficient coverage (such as convex parts) on the surface of fruits and vegetables, resulting in uneven distribution of preservation ingredients. For the current gas preservation equipment, the static stratification of different density gases is a key technical bottleneck affecting the uniformity of fruit and vegetable preservation, which is essentially a dynamic imbalance of diffusion-sedimentation caused by the difference in gas molecular weight. Taking the mixture of nitrogen (N2, molecular weight 28) and carbon dioxide (CO2, molecular weight 44) as an example, when static, CO2 will gradually settle at the bottom of the container due to its higher density, forming a concentration gradient, which causes the bottom fruits and vegetables to be exposed to a high-concentration CO2 environment for a long time, while the top fruits and vegetables are in a low-concentration or even pure nitrogen environment. This phenomenon has multiple negative effects on the quality of fruits and vegetables. SUMMARY

[0006] The purpose of the present application is to provide a gas-liquid complex sampling and spraying mechanism and a fruit and vegetable reduced pressure preservation equipment to solve the problems in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A gas-liquid complex sampling and spraying mechanism, comprising a liquid mixing and pumping device, a spray head, a gas mixing device and a gas circulator; The liquid mixing and pumping device is used to uniformly mix two or more liquids and pump them to the spray head through a first pipeline; The gas mixing device is used to uniformly mix two or more gases and deliver them to the inside of the preservation cabin through a second pipeline; The gas circulator is arranged inside the fresh-keeping bin and is operated by the lifting component, and an air outlet of the gas circulator is directed towards the mist sprayed by the spray head; A baffle is slidably arranged at a position of an air inlet of the gas circulator, and the baffle is used to adjust the air intake of the air inlet of the gas circulator; The position of the baffle is adjusted by an air intake adjuster, and the air intake adjuster comprises a fixedly arranged inclined rod and a sliding sleeve slidably arranged on the inclined rod, and the sliding sleeve is fixedly connected with the baffle; When the lifting component pushes the gas circulator to descend, the sliding sleeve slides obliquely downwards along the inclined rod, the baffle gradually slides towards the inside of the air inlet of the gas circulator, and the air inlet of the gas circulator gradually decreases; when the lifting component pushes the gas circulator to ascend, the sliding sleeve slides obliquely upwards along the inclined rod, the baffle gradually slides towards the outside of the air inlet of the gas circulator, and the air inlet of the gas circulator gradually increases.

[0008] Preferably, the gas circulator comprises an air exhaust cover, an air inlet cover and an air suction fan, the air suction fan is used to suck the gas inside the fresh-keeping bin to the inside of the air exhaust cover through the air inlet cover, and then the gas is exhausted through a rectangular air exhaust port of the air exhaust cover, so as to realize the circulation of the gas inside the fresh-keeping bin, and the air inlet of the gas circulator is arranged at the bottom of the air inlet cover.

[0009] Preferably, sliding rails are fixedly arranged on opposite sides of the inner wall of the air inlet cover, sliding grooves are arranged on opposite sides of the baffle, the baffle is slidably connected with the sliding rails through the sliding grooves, and the baffle is fixedly connected with the baffle through the connecting rod.

[0010] Preferably, a perforated plate is fixedly arranged at the position of the rectangular air exhaust port of the air exhaust cover, and first, second and arc-shaped baffles are fixedly arranged in the inside of the air exhaust cover, so as to divide the inside space of the air exhaust cover into first, second and third cavities. The air inlet cover and one end of the first cavity are in communication; A plurality of vertical strip-shaped holes are arranged on the first baffle, and the first cavity is in communication with the second cavity through the vertical strip-shaped holes; A plurality of horizontal strip-shaped holes are arranged on the second baffle, and the second cavity is in communication with the third cavity through the horizontal strip-shaped holes; The arc-shaped baffle is arranged in the inside of the third cavity; The vertical strip-shaped holes and the horizontal strip-shaped holes are arranged in a staggered manner, and the concave surface of the arc-shaped baffle is arranged in alignment with the horizontal strip-shaped holes.

[0011] Preferably, the air suction fan comprises a driving motor and a fan blade, a cylinder is fixedly arranged in communication between the air inlet cover and the air exhaust cover, the driving motor is mounted on the outside of the air inlet cover, and the output shaft of the driving motor extends through the cylinder to the inside of the cylinder and is fixedly connected with the fan blade.

[0012] Preferably, the spraying mechanism further comprises a receiving groove, the receiving groove comprising a back plate and four side wall plates fixedly connected to form a rectangular cylinder, the back plate being fixed at one end of the rectangular cylinder, and the other end of the rectangular cylinder being in communication with the fresh-keeping bin; the lifting component and the gas circulator are both arranged inside the rectangular cylinder.

[0013] Preferably, the lifting component comprises a reciprocating lead screw and a guide rod, and a speed reducer motor, the reciprocating lead screw and the guide rod being arranged in parallel. The reciprocating lead screw is rotatably connected inside the rectangular cylinder, and the speed reducer motor is installed at the top of the rectangular cylinder, and the output shaft of the speed reducer motor is coaxially fixedly connected with the reciprocating lead screw. The guide rod is fixedly arranged inside the rectangular cylinder. The reciprocating lead screw drives the gas circulator to lift by rotating, and the gas circulator is slidably connected with the guide rod.

[0014] Preferably, the spray head comprises a distribution pipe and a plurality of atomizing nozzles fixedly arranged at the bottom of the distribution pipe, and the distribution pipe is in communication with the first pipeline.

[0015] A fruit and vegetable reduced-pressure fresh-keeping device, comprising a fresh-keeping bin and a refrigerating machine, a vacuum pump and the above-mentioned gas-liquid compound sampling spraying mechanism arranged outside the fresh-keeping bin.

[0016] Compared with the prior art, the present application has the following advantages: The liquid mixing pump, the spray head and the gas mixing device arranged in the present application realize the combination of gas fresh-keeping and liquid fresh-keeping, and a set of equipment can realize two fresh-keeping modes. In addition, since the droplets have a large kinetic energy in the initial time period after leaving the spray head, and the kinetic energy of the droplets decreases after a certain time after leaving the spray head, different air speeds need to be used to blow the droplets so that the droplets can cover the surface of the fruit and vegetable to be fresh-kept as evenly as possible. Therefore, in the present application, a gas circulator and an air inlet regulator are arranged. Specifically, as the gas circulator gradually moves away from the spray head under the action of the lifting component, the gas flow rate and flow speed of the gas outlet of the gas circulator decrease, so that the blowing effect on the droplets away from the spray head is small, and the droplets at this position can cover the surface of the fruit and vegetable to be fresh-kept under the blowing effect. As the gas circulator gradually moves towards the spray head under the action of the lifting component, the gas flow rate and flow speed of the gas outlet of the gas circulator increase, so that the blowing effect on the droplets close to the spray head is large, and the droplets at this position can cover the surface of the fruit and vegetable to be fresh-kept under the blowing effect. At the same time, the gas circulator can also prevent the mixed gas from stratifying during gas fresh-keeping, thereby ensuring the fresh-keeping quality of the fruit and vegetable. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Structure diagram of the reduced-pressure fresh-keeping device of the present application; Figure 2 Structure diagram of the overall structure of the gas-liquid compound sampling and spraying mechanism of the present application; Figure 3 Structure diagram of the storage groove, lifting component and air intake regulator of the present application; Figure 4 Structure diagram of the storage groove, lifting component, gas circulator and air intake regulator of the present application; Figure 5 Structure diagram of the spraying head of the present application; Figure 6 Structure diagram of the lifting component, gas circulator and air intake regulator of the present application; Figure 7 Structure diagram of the air intake regulator of the present application; Figure 8 Sectional structure diagram of the air intake cover of the present application; Figure 9 Sectional structure diagram of the air exhaust cover of the present application; Figure 10 Partial sectional structure diagram of the air exhaust cover of the present application; Figure 11 Side sectional structure diagram of the air exhaust cover of the present application; Figure 12 Plan sectional structure diagram of the air exhaust cover of the present application; Figure 13 Partial plan sectional structure diagram of the air exhaust cover of the present application.

[0018] In the figure: 1, liquid mixing and pumping device; 2, spraying head; 201, distribution pipe; 202, atomizing nozzle; 3, first pipe; 4, gas mixing device; 5, second pipe; 6, storage groove; 601, side wall plate; 602, back plate; 7, lifting component; 701, reciprocating screw; 702, guide rod; 703, speed reducer motor; 8, gas circulator; 801, air exhaust cover; 802, air intake cover; 803, driving motor; 804, fan blade; 805, wind shield; 806, cylinder; 807, slide rail; 808, slide groove; 809, perforated plate; 810, first partition plate; 8101, vertical bar hole; 811, second partition plate; 8111, horizontal bar hole; 812, arc-shaped member; 813, first cavity; 814, second cavity; 815, third cavity; 9, air intake regulator; 901, inclined rod; 902, sliding sleeve; 903, connecting rod; 904, bracket; 100, fresh-keeping chamber; 200, refrigeration machine; 300, vacuum pump. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0020] Please refer to Figures 1-13 The present application provides a technical solution: The gas-liquid compound sampling and spraying mechanism comprises a liquid mixing and pumping device 1, a spraying head 2, a gas mixing device 4 and a gas circulator 8. The components will be described in detail below.

[0021] In the technical solution, the fresh-keeping bin 100 is a component of the fruit and vegetable pressure-reducing fresh-keeping device. The liquid mixing and pumping device 1 is used for uniformly mixing two or more liquids and pumping the liquids to the spraying head 2 through the first pipeline 3 for spraying. The liquid mixing and pumping device 1 comprises a liquid stirring mixer and a delivery pump. The basic working principle is that a plurality of liquids configured with a preservative enter the stirring cavity through a mass flow meter, and then the liquid stirring mixer is started to stir the liquids to uniformly mix the liquids, and then the liquids are delivered to the spraying head 2 through the delivery pump and sprayed through the spraying head 2. Since the liquid stirring mixer and the delivery pump are prior art, a person skilled in the art can understand the technical solution of the present application according to the above description, and the specific model of the liquid stirring mixer and the delivery pump is not limited in the technical solution, and a person skilled in the art can select a suitable model according to different working conditions.

[0022] The gas mixing device 4 is used for uniformly mixing two or more gases and delivering the gases to the inside of the fresh-keeping bin 100 through the second pipeline 5. Specifically, the working principle of the gas mixing device 4 is that two or more gases to be mixed enter two-stage or multi-stage pressure balancing devices through a one-way valve to balance the input pressure difference, so as to ensure that the pressures of the component gases and the dilution gas before mixing are absolutely the same, and then the flow control valve is adjusted to adjust the flow of various gases according to the desired mixing ratio. The dynamic gas mixing method is adopted in principle, that is, the mixed gas is used immediately after mixing, so as to ensure the uniformity, reproducibility and stability of the mixed gas. Since the gas mixing device 4 is prior art, a person skilled in the art can understand the technical solution of the present application according to the above description, and the specific model of the gas mixing device 4 is not limited in the technical solution, and a person skilled in the art can select a suitable model according to different working conditions.

[0023] The spray head 2 comprises a distribution pipe 201 and a plurality of atomizing nozzles 202 fixedly arranged at the bottom of the distribution pipe 201, the number of the atomizing nozzles 202 can be adaptively adjusted according to the space inside the fresh-keeping chamber 100, and the distribution pipe 201 is in communication with the first pipeline 3.

[0024] The gas circulator 8 is arranged inside the fresh-keeping chamber 100 and is lifted by the lifting member 7, and the air outlet of the gas circulator 8 faces the mist sprayed by the spray head 2; so that the mist uniformly covers the surface of the fruits and vegetables to be preserved under the action of the airflow discharged by the gas circulator 8, preventing the problem of local accumulation or insufficient coverage on the surface of the fruits and vegetables.

[0025] Further, the air inlet position of the gas circulator 8 is slidingly provided with a wind deflector 805, the air inlet of the gas circulator 8 is in the shape of a rectangle, the wind deflector 805 is a rectangular plate shape adapted to the air inlet of the gas circulator 8, and the wind deflector 805 is horizontally arranged, the wind deflector 805 is used to adjust the air intake size of the air inlet of the gas circulator 8, specifically, when the wind deflector 805 gradually penetrates into the air inlet of the gas circulator 8, the air inlet of the gas circulator 8 gradually shrinks, at this time, the gas flow discharged through the air outlet of the gas circulator 8 is reduced, and the flow rate is slowed down, when the wind deflector 805 gradually exits the air inlet of the gas circulator 8, the air inlet of the gas circulator 8 gradually increases, that is, the air intake increases, at this time, the gas flow discharged through the air outlet of the gas circulator 8 increases, and the flow rate increases, in general, since the mist has a large kinetic energy in the initial time period after leaving the spray head 2, and the kinetic energy of the mist decreases after a certain time after leaving the spray head 2, it is necessary to use different wind speeds to blow the mist, so that the mist can be uniformly covered on the surface of the fruits and vegetables to be preserved, therefore, in the present scheme, as the gas circulator 8 gradually moves away from the spray head 2 under the action of the lifting member 7, the gas flow discharged through the air outlet of the gas circulator 8 is reduced, and the flow rate is slowed down, so that the mist far away from the spray head 2 can be blown with a smaller blowing effect, so that the mist at this position can be covered on the surface of the fruits and vegetables to be preserved under the blowing effect, and as the gas circulator 8 gradually approaches the spray head 2 under the action of the lifting member 7, the gas flow discharged through the air outlet of the gas circulator 8 increases, and the flow rate increases, so that the mist close to the spray head 2 can be blown with a larger blowing effect, so that the mist at this position can be covered on the surface of the fruits and vegetables to be preserved under the blowing effect.

[0026] The position of the wind deflector 805 is adjusted by the air inlet regulator 9, specifically, the air inlet regulator 9 comprises a fixedly arranged inclined rod 901 and a sliding sleeve 902 slidably arranged on the inclined rod 901, wherein the inclined rod 901 is fixed on a bracket 904, the bracket 904 is mounted on the inner wall of the receiving groove 6 by bolts or other fasteners, and the sliding sleeve 902 is fixedly connected with the wind deflector 805; when the lifting component 7 pushes the gas circulator 8 to descend, the sliding sleeve 902 slides obliquely downward along the inclined rod 901, the wind deflector 805 gradually slides to the inside of the air inlet of the gas circulator 8, and the air inlet of the gas circulator 8 gradually decreases; when the lifting component 7 pushes the gas circulator 8 to ascend, the sliding sleeve 902 slides obliquely upward along the inclined rod 901, the wind deflector 805 gradually slides to the outside of the air inlet of the gas circulator 8, and the air inlet of the gas circulator 8 gradually increases.

[0027] The spraying mechanism in the technical solution further comprises a receiving groove 6, the receiving groove 6 comprises a back plate 602 and four side wall plates 601, the four side wall plates 601 are fixedly connected to form a rectangular cylinder, the back plate 602 is fixed at one end of the rectangular cylinder, and the other end of the rectangular cylinder is in communication with the fresh-keeping bin 100; the lifting component 7 and the gas circulator 8 are arranged inside the rectangular cylinder.

[0028] Further, the lifting component 7 comprises a reciprocating lead screw 701, a guide rod 702 and a speed reducer 703, and the reciprocating lead screw 701 and the guide rod 702 are arranged in parallel; the reciprocating lead screw 701 drives the gas circulator 8 to ascend and descend by rotating, and the gas circulator 8 is slidably connected with the guide rod 702; the reciprocating lead screw 701 is rotatably connected inside the rectangular cylinder by a bearing, the speed reducer 703 is mounted at the top of the rectangular cylinder, and the output shaft of the speed reducer 703 is coaxially and fixedly connected with the reciprocating lead screw 701; the guide rod 702 is fixedly arranged inside the rectangular cylinder, for example, the guide rod 702 is mounted inside the rectangular cylinder by bolts.

[0029] In the technical solution, the gas circulator 8 comprises an exhaust cover 801, an air inlet cover 802 and an exhaust fan, the exhaust cover 801 is a rectangular hollow structure, and the side facing the mist droplets is designed as an open side, the exhaust fan sends the gas inside the fresh-keeping bin 100 to the inside of the exhaust cover 801 through the air inlet cover 802, and then discharges the gas through the rectangular exhaust port of the exhaust cover 801, so as to realize the circulation of the gas inside the fresh-keeping bin 100, the air inlet of the gas circulator 8 is arranged at the bottom of the air inlet cover 802, that is, the air inlet of the gas circulator 8 is the air inlet of the air inlet cover 802, and the air inlet area of the air inlet cover 802 in the embodiment is smaller than the area of the rectangular exhaust port of the exhaust cover 801.

[0030] The air suction fan comprises a driving motor 803 and a fan blade 804, a cylindrical body 806 is fixedly connected between the air inlet cover 802 and the air outlet cover 801, the driving motor 803 is installed outside the air inlet cover 802, and the output shaft of the driving motor 803 extends to the inside of the cylindrical body 806 and is fixedly connected with the fan blade 804. The driving motor 803 is used to drive the fan blade 804 to rotate at a high speed, so that the gas in the fresh-keeping bin 100 is transported to the inside of the air outlet cover 801 through the air inlet cover 802, and then is discharged from the rectangular air outlet of the air outlet cover 801, and the length of the rectangular air outlet is greater than the length of the spraying area generated by the spraying head 2.

[0031] The sliding mode of the wind deflector 805 is as follows: the opposite two sides of the inner wall of the air inlet cover 802 are fixedly provided with sliding rails 807, the opposite two sides of the wind deflector 805 are provided with sliding grooves 808, the wind deflector 805 is slidably connected with the sliding rails 807 through the sliding grooves 808, and the wind deflector 805 is fixedly connected with the wind deflector 805 through the connecting rod 903. In this way, the horizontal sliding connection between the wind deflector 805 and the air inlet cover 802 can be realized.

[0032] In order to make the airflow discharged from the rectangular air outlet of the air outlet cover 801 uniform, the internal structure of the air outlet cover 801 in the technical scheme is as follows: a plurality of perforated plates 809 are fixedly arranged at the position of the rectangular air outlet of the air outlet cover 801, the plurality of through holes in the perforated plates 809 are used to discharge the gas in the inside of the air outlet cover 801, and the inside of the air outlet cover 801 is fixedly provided with a first partition plate 810, a second partition plate 811 and an arc-shaped part 812. The first partition plate 810, the second partition plate 811 and the arc-shaped part 812 are used to divide the internal space of the air outlet cover 801 into a first cavity 813, a second cavity 814 and a third cavity 815, and the third cavity 815 is arranged between the perforated plate 809 and the second partition plate 811.

[0033] The air inlet cover 802 and one end of the first cavity 813 are communicated; a plurality of vertical strip holes 8101 are arranged on the first partition plate 810, the first cavity 813 is communicated with the second cavity 814 through the plurality of vertical strip holes 8101; a plurality of horizontal strip-shaped holes 8111 are arranged on the second partition plate 811, the second cavity 814 is communicated with the third cavity 815 through the plurality of horizontal strip-shaped holes 8111; the arc-shaped part 812 is arranged in the third cavity 815; the vertical strip holes 8101 and the horizontal strip-shaped holes 8111 are arranged in a staggered manner, and the concave surface of the arc-shaped part 812 is arranged in alignment with the horizontal strip-shaped holes 8111.

[0034] In actual work, the gas sucked by the suction fan first enters the inside of the first cavity 813, then enters the inside of the second cavity 814 through the vertical strip hole 8101, then enters the inside of the third cavity 815 through the horizontal strip hole 8111, and after entering the third cavity 815, the airflow first impacts the inside of the arc-shaped member 812, diffuses in the third cavity 815 after buffering of the arc-shaped member 812, and finally is discharged through the porous plate 809, so that uniform discharge of the gas can be realized, and it is ensured that the mist droplets can be blown by uniform airflow.

[0035] The fruit and vegetable pressure reduction fresh-keeping device comprises a fresh-keeping bin 100, a refrigerating machine 200, a vacuum pump 300 and the gas-liquid compound sampling and spraying mechanism, the refrigerating machine 200 is used for refrigerating and cooling the inside of the fresh-keeping bin 100, the vacuum pump 300 is used for sucking part of air in the inside of the fresh-keeping bin 100, and the refrigerating machine 200 and the vacuum pump 300 cooperate to realize a low-temperature pressure reduction environment in the inside of the fresh-keeping bin 100 and realize a fresh-keeping effect.

[0036] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A gas-liquid compound sampling spraying mechanism, the spraying mechanism being used for spraying in a fresh-keeping bin, characterized in that, The liquid mixing pump, the spray head, the gas mixing device and the gas circulator are included. The liquid mixing pump is used for uniformly mixing two or more liquids and pumping the liquids to the spray head through a first pipeline. The gas mixing device is used for uniformly mixing two or more gases and delivering the gases to the inside of the fresh-keeping chamber through a second pipeline. The gas circulator is arranged in the inside of the fresh-keeping chamber and is operated by lifting and lowering through a lifting component, and an air outlet of the gas circulator is directed towards the mist sprayed by the spray head. A baffle is slidably arranged at the position of an air inlet of the gas circulator, and the baffle is used for adjusting the air intake amount of the air inlet of the gas circulator. The position of the baffle is adjusted through an air intake adjuster, and the air intake adjuster includes a fixed inclined rod and a sliding sleeve slidably arranged on the inclined rod, and the sliding sleeve is fixedly connected with the baffle. When the lifting component pushes the gas circulator to descend, the sliding sleeve slides obliquely downwards along the inclined rod, the baffle gradually slides towards the inside of the air inlet of the gas circulator, and the air inlet of the gas circulator gradually decreases; when the lifting component pushes the gas circulator to ascend, the sliding sleeve slides obliquely upwards along the inclined rod, the baffle gradually slides towards the outside of the air inlet of the gas circulator, and the air inlet of the gas circulator gradually increases.

2. The gas-liquid complex sampling spraying mechanism according to claim 1, characterized in that, The gas circulator includes an exhaust cover, an air inlet cover and an exhaust fan, the exhaust fan sucks the gas in the inside of the fresh-keeping chamber to the inside of the exhaust cover through the air inlet cover, and then discharges the gas through a rectangular air outlet of the exhaust cover, so as to realize the circulation of the gas in the inside of the fresh-keeping chamber, and the air inlet of the gas circulator is arranged at the bottom of the air inlet cover.

3. The gas-liquid compound sampling spraying mechanism according to claim 2, characterized in that, Opposite sides of the inner wall of the air inlet cover are fixedly provided with sliding rails, opposite sides of the baffle are provided with sliding grooves, the baffle is slidably connected with the sliding rails through the sliding grooves, and the baffle is fixedly connected with the baffle through a connecting rod.

4. The gas-liquid compound sampling spraying mechanism according to claim 2, characterized in that, The rectangular air outlet of the exhaust cover is fixedly provided with a multi-hole plate, and the inside of the exhaust cover is fixedly provided with a first partition plate, a second partition plate and an arc-shaped member, so as to divide the inside space of the exhaust cover into a first cavity, a second cavity and a third cavity. The air inlet cover and one end of the first cavity are communicated. A plurality of vertical strip holes are formed in the first partition plate, and the first cavity is communicated with the second cavity through the vertical strip holes. A plurality of horizontal strip holes are formed in the second partition plate, and the second cavity is communicated with the third cavity through the horizontal strip holes. The arc-shaped member is arranged in the inside of the third cavity. The vertical strip holes and the horizontal strip holes are arranged in a staggered manner, and the concave surface of the arc-shaped member is arranged in alignment with the horizontal strip holes.

5. The gas-liquid compound sampling spraying mechanism according to claim 2, characterized in that, The exhaust fan includes a driving motor and a fan blade, a cylinder is fixedly and communicatively arranged between the air inlet cover and the exhaust cover, the driving motor is mounted at the outside of the air inlet cover, and an output shaft of the driving motor extends through the cylinder to the inside of the cylinder and is fixedly connected with the fan blade.

6. The gas-liquid compound sampling spraying mechanism according to claim 1, characterized in that, The spray mechanism further includes a receiving groove, the receiving groove includes a back plate and four side wall plates, the four side wall plates are fixedly connected to form a rectangular cylinder, the back plate is fixed at one end of the rectangular cylinder, and the other end of the rectangular cylinder is communicated with the fresh-keeping chamber; and the lifting component and the gas circulator are arranged in the inside of the rectangular cylinder.

7. The gas-liquid compound sampling spraying mechanism according to claim 6, characterized in that, The lifting component comprises a reciprocating screw rod and a guide rod, and a speed reducer motor, the reciprocating screw rod and the guide rod are arranged in parallel; The reciprocating screw rod is rotationally connected in the interior of the rectangular cylinder, the speed reducer motor is installed on the top of the rectangular cylinder, and the output shaft of the speed reducer motor is coaxially fixedly connected with the reciprocating screw rod; The guide rod is fixedly arranged in the interior of the rectangular cylinder; The reciprocating screw rod drives the gas circulator to lift by rotating, and the gas circulator is slidingly connected with the guide rod.

8. The gas-liquid compound sampling spraying mechanism according to claim 1, characterized in that, The spray head comprises a distribution pipe and a plurality of atomizing nozzles fixedly arranged at the bottom of the distribution pipe, and the distribution pipe is communicated with the first pipeline.

9. A fruit and vegetable pressure-reducing fresh-keeping device, characterized in that, The fruit and vegetable pressure reduction fresh-keeping equipment comprises a fresh-keeping bin, a refrigerating machine arranged outside the fresh-keeping bin, a vacuum pump and the gas-liquid compound sampling spraying mechanism in any one of claims 1-8.

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