Pasteurizer with multi-layer tray rack

Abstract

The present invention discloses a pasteurization machine for a multi-layer material tray placement rack, wherein a plurality of liquid spraying pipes are arranged from bottom to top in the middle of a chassis, and the liquid spraying pipes spray liquid horizontally toward the two end side walls of the chassis, respectively, and liquid return devices are arranged on the two end side walls of the chassis, respectively, and the liquid return devices are provided with liquid return holes corresponding to the liquid spraying pipes, and the liquid in the circulating liquid return pipe enters the circulating liquid inlet pipe through a circulating pump, and the part of the circulating liquid inlet pipe located outside the chassis passes through a heating device, and the liquid sprayed by the liquid spraying pipes corresponds to the materials of each layer of the material tray of the placement rack, and a temperature sensor is arranged on the upper part of the side wall of the chassis. It can be known from the above structure that the pasteurization machine for a multi-layer material tray placement rack of the present invention enables the materials of each layer of the material tray of the entire placement rack to effectively maintain the temperature of the surrounding water area through the liquid sprayed by the corresponding liquid spraying pipes, so that the materials can be effectively kept within the required temperature range for a long time, thereby achieving the effect of pasteurization.

Description

Technical Field

[0001] The invention relates to the technical field of pasteurization equipment, in particular to a pasteurization machine with a multi-layer material tray placement rack. Background Art

[0002] With the development of food processing, more and more food processing has been automated. In order to match the automated and intelligent production process, the original food processing equipment needs to be improved.

[0003] In the food processing industry, packaged food needs to be sterilized to extend the shelf life of packaged food. At present, there are generally two ways to sterilize packaged food in food production companies. One is high-temperature sterilization and the other is low-temperature sterilization. Although high-temperature sterilization can sterilize more thoroughly, it will also destroy the nutrients in the food and even affect the taste of the food, and the energy consumption is relatively high. Low-temperature sterilization can maintain the original properties of the food while sterilizing, and will not destroy the vitamins, minerals and other nutrients in the food, thereby retaining the nutritional value of the food, and will not damage or deteriorate the taste of the food. It is particularly suitable for some temperature-sensitive foods.

[0004] In actual production, many manufacturers generally choose low-temperature sterilization to reduce their energy consumption. However, low-temperature sterilization also has a disadvantage, which is that the time required for low-temperature sterilization is generally relatively long. This may affect the production rhythm of the company.

[0005] At present, the most commonly used low-temperature sterilization is pasteurization. Pasteurization usually uses heat below 100°C for sterilization, and then uses low temperature for storage. Depending on the sterilization object, the temperature range of pasteurization is not necessarily the same. Basically, its temperature range can be between 62 degrees Celsius and 90 degrees Celsius.

[0006] Enterprises generally adopt a tunnel structure. Depending on the food to be sterilized, the temperature in the tunnel is adjusted to a matching pasteurization temperature range. The food materials to be sterilized are then conveyed through the tunnel, and the conveying speed is controlled so that the time the food to be sterilized stays in the tunnel is greater than or equal to the time required for pasteurization.

[0007] This results in a relatively slow transmission speed, and the tunnel structure requires a large amount of site area. In addition, the two ends of the tunnel structure are generally open structures to facilitate the entry and exit of trolleys loaded with materials into the tunnel, which leads to a large temperature loss in the tunnel. In order to maintain the temperature in the tunnel, a certain amount of energy consumption is required to ensure that the temperature in the tunnel is always within the pasteurization temperature range. Moreover, the opening of the two ends of the tunnel will inevitably cause the temperature at both ends of the tunnel to be lower than the temperature in the middle, which leads to uneven temperature, and then causes air flow in the tunnel to form wind, which further leads to a decrease in the temperature in the tunnel, resulting in adverse effects on the sterilization effect of the materials in the tunnel. It is necessary to provide additional heating devices to ensure that the temperature in the tunnel can be stabilized within the pasteurization temperature. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a pasteurizer for a multi-layer material tray placement rack, wherein each liquid spraying pipe corresponds to the liquid return hole provided in the liquid return tank, so that the liquid sprayed by the liquid spraying pipe can enter the liquid return tank from the liquid return hole at the corresponding position for circulation after being sprayed horizontally, and the amount of liquid sprayed is exactly equal to the amount of liquid circulating in the liquid return tank through the liquid return hole, which will not affect the total amount of liquid in the chassis, thereby forming a laminar flow phenomenon, and multiple layers are arranged in sequence from top to bottom, and the amount of liquid sprayed on each layer is equal to the amount of liquid circulating in the liquid return tank, so that the materials on each layer of the material tray of the entire placement rack can effectively maintain the temperature of the surrounding water area through the liquid sprayed by the corresponding liquid spraying pipe, so that they can be effectively kept in the required temperature range for a long time, thereby achieving the effect of pasteurization.

[0009] The technical solution adopted by the present invention is: A pasteurizer for a multi-layer material tray placement rack comprises a chassis with an open top, wherein a plurality of liquid spray pipes respectively connected to a circulating liquid inlet pipe are arranged in the middle of the chassis from bottom to top, and the liquid sprayed by the liquid spray pipe is respectively and simultaneously sprayed horizontally toward the side walls at both ends of the chassis, and the side walls at both ends in the chassis are respectively provided with liquid return devices connected to a circulating liquid return pipe, and the liquid return devices are respectively provided with a plurality of liquid return holes corresponding to each liquid spray pipe, and the liquid in the circulating liquid return pipe enters the circulating liquid inlet pipe through a circulating pump, and the portion of the circulating liquid inlet pipe located outside the chassis passes through a heating device, and the placement racks with multi-layer materials are respectively placed at positions between the liquid spray pipe and the side wall of the chassis, and the liquid sprayed horizontally by the liquid spray pipe is respectively sprayed toward the materials of each layer of the material tray placed on the placement rack, and a temperature sensor is also provided on the upper part of the side wall of the chassis, and the temperature sensor is lower than the liquid level in the chassis.

[0010] A further improvement of the present invention is that each liquid spray pipe is provided with two groups of liquid spray nozzles, and the two groups of liquid spray nozzles spray liquid to the materials on the corresponding material trays on both sides of the liquid spray pipe respectively; each group of liquid spray nozzles is provided with multiple ones, which are distributed along the extension direction of the liquid spray pipe.

[0011] A further improvement of the present invention is that the return liquid holes are provided in multiple groups corresponding to the positions of the liquid sprayed from each spray pipe, each group of return liquid holes is provided with multiple rows along a direction perpendicular to the extension of the spray pipe, and each row of return liquid holes is evenly provided with multiple return liquid holes along a direction parallel to the extension of the spray pipe.

[0012] A further improvement of the present invention is that the liquid return device includes a liquid return groove fixed to the side wall of the chassis, the groove of the liquid return groove faces away from the liquid spray pipe and is sealed and fixed to the chassis, the liquid return hole is arranged at the bottom of the liquid return groove, the circulating liquid return pipe is connected with the liquid return branch pipe through a tee, and the liquid return branch pipe passes through the bottom plate and the bottom groove wall of the liquid return groove from the bottom plate of the chassis and the position corresponding to the liquid return device upward, and then communicates with the inside of the liquid return groove.

[0013] A further improvement of the present invention is that the portion of the liquid return branch pipe located in the liquid return tank is connected from bottom to top with a plurality of liquid return branch pipes, the number and positions of the liquid return branch pipes respectively correspond to each liquid spray pipe, and a strip hole is provided on one side of the liquid return branch pipe facing the liquid return hole of the liquid return tank along the extension direction of the liquid return branch pipe.

[0014] A further improvement of the present invention is that the heating device comprises a heat exchange sleeve coaxially wrapped and fixed to the outer side wall of the circulating liquid inlet pipe, the circulating liquid inlet pipe corresponds to a tube bundle formed by a part of a plurality of parallel thin unit tubes in the heat exchange sleeve, and connectors are provided at both ends of the tube bundle, and the connectors seal and connect the corresponding ends of each thin unit tube with the circulating liquid inlet pipe, and the side wall of the heat exchange sleeve is located at the end where the circulating liquid inlet pipe flows out of the heat exchange sleeve and is connected with a heat inlet pipe, and the side wall of the heat exchange sleeve is also connected with a heat outlet pipe, and the heat outlet pipes are respectively connected with two heat outlet branch pipes, one of which is connected to the end of the side wall of the heat exchange sleeve located at the end where the circulating liquid inlet pipe flows into the heat exchange sleeve, and the other heat outlet branch pipe is connected to the middle of the side wall of the heat exchange sleeve.

[0015] A further improvement of the present invention is that the thin unit tube is a spiral tube, and the spiral axis of the spiral tube is coaxially arranged with the circulating liquid inlet tube connected to both ends of the heat exchange sleeve.

[0016] A further improvement of the present invention is that a liquid adding pipe is connected to the top of the side wall of the chassis, a liquid drain pipe is connected to the bottom plate of the bottom of the chassis, and an overflow pipe is connected to the upper part of the side wall of the chassis, and the height of the overflow pipe is higher than the material at the top of the placement rack placed in the chassis.

[0017] A further improvement of the present invention is that the bottom plate is tilted downward from both sides to the middle to form a "V"-shaped structure, the drain pipe is located at the bottom of the "V"-shaped structure, and a filtering device is provided at the connection between the drain pipe and the bottom plate.

[0018] A further improvement of the present invention is that a positioning block for placing and connecting the supporting legs of the placement frame is provided on the top of the bottom plate, and the top surfaces of the positioning blocks located on the same side of the spray pipe are flush and horizontal.

[0019] The beneficial effects of the present invention are: First, the pasteurizer of the multi-layer material tray placement rack of the present invention corresponds to the liquid return hole set in the liquid return tank through each liquid spray pipe, so that the liquid sprayed by the liquid spray pipe enters the liquid return tank from the liquid return hole at the corresponding position for circulation after being sprayed horizontally, and the amount of liquid sprayed is exactly equal to the amount of liquid circulating in the liquid return tank through the liquid return hole, which will not affect the total amount of liquid in the chassis, thereby forming a laminar flow phenomenon, and multiple layers are arranged in sequence from top to bottom, and the amount of liquid sprayed on each layer is equal to the amount of liquid circulating in the liquid return tank, so that the materials of each layer of the material tray of the entire placement rack are effectively kept at the temperature of the surrounding water area by the liquid sprayed by the corresponding liquid spray pipe, so that they can be effectively kept in the required temperature range for a long time, thereby achieving the effect of pasteurization.

[0020] Secondly, the pasteurizer of the multi-layer material tray placement rack of the present invention can minimize the impact of the return pipe connected to the circulation pump on the surrounding water when it generates negative pressure water absorption in the chassis through the function of the return liquid groove and the return liquid hole, so that it only acts on the liquid sprayed by the spray pipe that is spraying liquid, so that the liquid sprayed by the spray pipe can effectively act only on the materials of the material tray of the corresponding layer of the placement rack, and can effectively improve the circulation efficiency and water circulation rate when the power of the circulation pump is constant, and can effectively reduce the power of the circulation pump when the water circulation rate is constant.

[0021] Thirdly, the pasteurizer of the multi-layer material tray placement rack of the present invention can provide two connection modes with different heat exchange degrees according to the water temperature heating requirements in the chassis through the two heat source branch pipes at different connection positions arranged on the heat exchange sleeve, while keeping the heat source flow rate unchanged. This can not only improve the heating speed when the temperature in the chassis is lower than the lower limit of the pasteurization temperature, but also improve the temperature regulation accuracy when the temperature in the chassis reaches the pasteurization temperature range.

[0022] Fourthly, the pasteurizer of the multi-layer material tray placement rack of the present invention can make the heat source in the heat exchange sleeve fully contact with the circulating liquid inlet pipe for heat exchange through the structure of the circulating liquid inlet pipe at the position of the heat exchange sleeve, thereby further effectively improving the heat exchange efficiency of the heat exchange sleeve to the circulating liquid inlet pipe.

[0023] Fifth, the pasteurizer of the multi-layer material tray placement rack of the present invention can drain the water in the chassis as much as possible through the structure of the chassis bottom plate and the connection position of the drain pipe and the bottom plate. The bottom plate structure can also make the impurities in the water in the chassis settle at the bottom of the chassis and there is a distance between the impurities and the material tray at the bottom layer of the placement rack placed in the chassis, thereby preventing the impurities from contaminating the materials in the material tray.

[0024] Sixth, the pasteurizer of the multi-layer material tray placement rack of the present invention prevents the drainage pipe from discharging impurities into the water storage device through the filtering device provided on the drainage pipe.

[0025] Seventh, the pasteurizer of the multi-layer material tray placement rack of the present invention, through the positioning placement blocks provided on the bottom plate, can not only facilitate the placement rack to be accurately placed between the spray pipe and the return liquid tank, but the positioning placement blocks can also improve the supporting performance and avoid deformation of the chassis bottom plate. It can also ensure that the placement rack is stable after placement, and the height of each layer of material tray matches the return liquid hole of the corresponding spray pipe and return liquid tank.

[0026] Eighth, the pasteurizer of the multi-layer material tray placement rack of the present invention ensures that the materials in the material trays of each layer of the placement rack located in the chassis are below the liquid level in the chassis through the connection height of the overflow pipe and the chassis, ensuring that the materials can be pasteurized.

[0027] Ninth, the pasteurizer of the multi-layer material tray placement rack of the present invention can maintain a closed state at all times except when the placement rack is placed in or taken out of the chassis through the connection structure of the cover A and the cover B, thereby minimizing the heat loss caused by the heat release of the water temperature in the chassis to the outside and preventing the water in the chassis from being contaminated by the outside air. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a three-dimensional schematic diagram of the present application located on the side where the pipeline is located.

[0029] Figure 2 This is a three-dimensional schematic diagram of the present application located on the side facing away from the pipeline.

[0030] Figure 3 The top view schematic diagram of the top cover A and the top cover B is hidden for this application.

[0031] Figure 4 A three-dimensional schematic diagram at one end with top cover A and top cover B hidden for the purpose of this application.

[0032] Figure 5 For this application, the top view schematic diagram is shown with the top cover A and the top cover B hidden after the material rack is placed. DETAILED DESCRIPTION

[0033] Combination Figure 1~Figure 5It can be seen that the pasteurizer of the multi-layer material tray placement rack includes a chassis 1 with an open top, and a middle part of the chassis 1 is provided with multiple layers of spray pipes 6 respectively connected to the circulating liquid inlet pipe 13 from bottom to top, and the liquid sprayed by the spray pipe 6 is sprayed horizontally to the side walls of the chassis 1 at both ends at the same time, and the side walls at both ends in the chassis 1 are respectively provided with liquid return devices connected to the circulating liquid return pipe 14, and the liquid return devices are respectively provided with a plurality of liquid return holes 9 corresponding to each spray pipe 6. The liquid in the circulating liquid return pipe 14 enters the circulating liquid inlet pipe 13 through the circulating pump 12, and the part of the circulating liquid inlet pipe 13 located outside the chassis 1 passes through a heating device. The placement racks 27 with multiple layers of materials are placed respectively at the position between the spray pipe 6 and the side wall of the chassis 1, and the liquid sprayed horizontally by the spray pipe 6 corresponds to the materials of each layer of material trays 28 placed on the placement rack 27. The upper part of the side wall of the chassis 1 is also provided with a temperature sensor 23, and the temperature sensor 23 is lower than the liquid level in the chassis 1.

[0034] Each liquid spray pipe 6 is provided with two groups of liquid spray nozzles 7, which spray liquid toward the materials in the corresponding material trays 28 on both sides of the liquid spray pipe 6 respectively; each group of liquid spray nozzles 7 is provided with multiple ones, which are distributed along the extension direction of the liquid spray pipe 6.

[0035] The return liquid holes 9 are provided in multiple groups corresponding to the positions of the liquid sprayed from each spray pipe 6, each group of return liquid holes 9 is provided with multiple rows along the extension direction perpendicular to the spray pipe 6, and each row of return liquid holes 9 is evenly provided with multiple return liquid holes 9 along the extension direction parallel to the spray pipe 6.

[0036] The liquid return device includes a liquid return groove 8 fixed to the side wall of the end where the chassis 1 is located. The groove of the liquid return groove faces away from the liquid spray pipe 6 and is sealed and fixed to the chassis 1. The liquid return hole 9 is arranged at the bottom of the liquid return groove 8. The circulating liquid return pipe 14 is connected with the liquid return branch pipe 15 through a tee. The liquid return branch pipe 15 passes through the bottom plate 4 and the bottom groove wall of the liquid return groove 8 from the bottom plate 4 of the chassis 1 and the position corresponding to the liquid return device, and then communicates with the inside of the liquid return groove 8.

[0037] The portion of the liquid return branch pipe 15 located in the liquid return tank is connected to a plurality of liquid return branch pipes from bottom to top, the number and position of the liquid return branch pipes respectively correspond to each liquid spray pipe 6, and a strip hole is provided on one side of the liquid return branch pipe facing the liquid return hole 9 of the liquid return tank along the extension direction of the liquid return branch pipe.

[0038] The heating device includes a heat exchange sleeve 19 coaxially wrapped and fixed to the outer wall of the circulating liquid inlet pipe 13, the circulating liquid inlet pipe 13 corresponds to a tube bundle formed by a plurality of parallel thin unit tubes in the heat exchange sleeve 19, and connectors are provided at both ends of the tube bundle, and the connectors seal and connect the corresponding ends of each thin unit tube with the circulating liquid inlet pipe 13, and the side wall of the heat exchange sleeve 19 is located at the end where the circulating liquid inlet pipe 13 flows out of the heat exchange sleeve 19 and is connected with a heat inlet pipe 20, and the side wall of the heat exchange sleeve 19 is also connected with a heat outlet pipe 21, and the heat outlet pipe 21 is respectively connected with two heat outlet branch pipes 22, one of which is connected to the end of the side wall of the heat exchange sleeve 19 where the circulating liquid inlet pipe 13 flows into the heat exchange sleeve 19, and the other heat outlet branch pipe 22 is connected to the middle part of the side wall of the heat exchange sleeve 19.

[0039] The thin unit tube is a spiral tube, and the spiral axis of the spiral tube is coaxially arranged with the circulating liquid inlet pipe 13 connected to the two ends of the heat exchange sleeve 19.

[0040] The top of the side wall of the chassis 1 is connected to a liquid adding pipe 18, the bottom plate 4 at the bottom of the chassis 1 is connected to a liquid drain pipe 16, and the upper part of the side wall of the chassis 1 is connected to an overflow pipe 31, and the height of the overflow pipe 31 is higher than the material at the top of the placement rack 27 placed in the chassis 1.

[0041] The bottom plate 4 is tilted downward from both sides to the middle to form a "V"-shaped structure. The drain pipe 16 is located at the bottom of the "V"-shaped structure. A filtering device 17 is provided at the connection between the drain pipe 16 and the bottom plate 4.

[0042] The liquid adding pipe 18 , the liquid discharging pipe 16 and the overflow pipe 31 are all connected to the water storage device respectively.

[0043] The top of the bottom plate 4 is provided with a positioning block 26 for placing the supporting legs of the connecting placement frame 27, and the top surfaces of the positioning blocks 26 located on the same side of the liquid spraying pipe 6 are flush and horizontal.

[0044] The liquid spraying pipes 6 are respectively communicated with the connecting risers 5 , and the circulating liquid inlet pipes 13 extend into the chassis 1 and communicate with the connecting risers 5 .

[0045] The top surface area of ​​the placement block 26 is larger than the bottom surface area of ​​the support legs of the placement rack 27 .

[0046] A connecting horizontal plate 10 is fixed to the top of the chassis 1, and both ends of the connecting horizontal plate 10 are fixedly connected to the side walls of the chassis 1 on both sides. A connecting vertical plate 11 is fixed to the bottom of the connecting horizontal plate 10, and the spray pipes 6 are fixed to the connecting vertical plates 11 respectively.

[0047] The top of the chassis 1 is also provided with a cover A2 and a cover B3 that slide back and forth along the top edges of the side walls on both sides of the chassis 1. The cover B3 is located on the outside of the cover A2. When the cover A2 and the cover B3 are respectively moved to two different ends of the chassis 1, the edge of the cover A2 facing the cover B3 is located within the range of the cover B3. When the cover A2 and the cover B3 are respectively moved to the same end of the chassis 1, the placement rack 27 placed in the chassis 1 away from the cover A2 and the cover B3 is located within the open range of the chassis 1.

[0048] The top of the two side walls of the chassis 1 are symmetrically provided with tracks 24 along the extension direction of the side walls, and the tracks 24 include inner tracks and outer tracks. The bottom of the two side edges of the cover A2 reciprocates along the inner tracks, and the bottom of the two side edges of the cover B3 reciprocates along the outer tracks.

[0049] The outer sides of the top edges of the two side walls of the chassis 1 are symmetrically provided with guide longitudinal rods 25 arranged parallel to the extending direction of the side walls, and the cover plate B3 is slidably connected to the guide longitudinal rods 25 via sliders.

[0050] The bottom and sides of the material tray 28 are evenly provided with liquid holes.

[0051] The overflow pipe 31 is communicated with a water storage device connected to the liquid adding pipe 18 .

[0052] It also includes a processor, and the temperature sensor 23, the heat source pump and the circulation pump are electrically connected to the processor respectively.

[0053] Combination Figure 1~Figure 5 It can be seen that the pasteurization method of packaged meat food includes the following steps: 1) Before placing the material into the chassis 1, first move the cover A2 and the cover B3 to the two ends of the chassis 1 respectively, so that the cover A2 and the cover B3 close the top opening of the chassis 1; 2) Then water is injected into the chassis 1 through the liquid injection pipe 18. When the amount of water in the chassis 1 meets the following conditions, the liquid injection pipe 18 stops injecting water: after one placement rack 27 is fixed in the chassis 1, after two placement racks 27 are fixed in the chassis 1, the liquid level in the chassis 1 is lower than or equal to the bottom pipe opening of the overflow pipe 31; 3) The processor controls the circulation pump 12 to start, and increases the temperature of the heat source and the water in the circulation liquid inlet pipe 13 passing through the heat exchange sleeve 19 through the heat source inlet pipe 20, and then heats the water in the chassis 1 through the water in the circulation liquid inlet pipe 13 heated by the heat exchange sleeve 19, so that the water temperature in the chassis 1 is within the temperature range to be reached by the material to be pasteurized; 4) When the temperature sensor 23 detects that the water temperature in the chassis 1 reaches the upper limit of the pasteurization temperature range of the material to be pasteurized, the cover plate A2 is moved to the maximum stroke position facing the cover plate B3 or the cover plate B3 is moved to the maximum stroke position facing the cover plate A2. At this time, the chassis 1 is located at the top opening on one side of the spray pipe 6. The placement rack 27 filled with material trays 28 of various layers from top to bottom to be pasteurized is lifted by the lifting device and placed into the chassis 1 from the opening, and the supporting legs at the bottom of the placement rack 27 are placed on the top surface of the placement block 26 respectively, so as to ensure that the placement rack 27 can be stably placed in the chassis 1, and then the lifting tool of the lifting device is separated from the placement rack 27; 5) After the placement rack 27 is placed and fixed in the chassis 1, the cover A2 and the cover B3 are moved to the two ends of the chassis 1 again, so that the cover A2 and the cover B3 close the top opening of the chassis 1; 6) The materials in the material trays 28 of each layer of the rack 27 are immersed in the water in the chassis 1, so they can immediately reach the pasteurization temperature. At the same time, the water temperature in the chassis 1 of the rack 27 will also be reduced due to heat exchange with the material trays 28 of each layer of the rack 27 and the materials. The hot water heated by the heat exchange sleeve 19 is sprayed horizontally to the materials of the material trays 28 of each layer of the rack 27 through each spray pipe 6 and continues to transfer heat. The sprayed hot water passes through the corresponding side The material in the material tray 28 will enter the liquid return tank 8 on the corresponding side of the chassis 1 through the liquid return hole 9, and then enter the circulating liquid return pipe 14 through the liquid return branch pipe 15, and then enter the circulating liquid inlet pipe 13 again through the circulating pump 12, and pass through the heat exchange sleeve 19 again to heat the water in the circulating liquid inlet pipe 13. After being heated, the water in the circulating liquid inlet pipe 13 will enter the liquid spray pipe 6 again, and will be sprayed to the material in the corresponding layer of the material tray 28 through the liquid spray pipe 6 again, so that the water temperature around the material is still within the pasteurization temperature range; 7) When the placement rack 27 has been placed in the chassis 1 for the time required for pasteurization, the cover A2 is moved to the maximum stroke facing the cover B3 or the cover B3 is moved to the maximum stroke facing the cover A2. At this time, the top of the side where the pasteurized placement rack 27 is placed in the chassis 1 is open. The pasteurized placement rack 27 is lifted by a lifting device and lifted away from the chassis 1 from the open part, and transferred to the cooling equipment to quickly cool the placement rack 27 and the materials on the material trays 28 on each layer fixed to the placement rack 27, thereby finally achieving pasteurization of the materials.

[0054] In step 2), the circulation pump 12 is turned on at the same time so that the water in the chassis 1 can fill the circulation pipeline including the circulation liquid inlet pipe 13 and the circulation liquid return pipe 14. When the circulation pipeline is full of water, the circulation pump 12 is turned off.

[0055] In the step 2), after the water in the chassis 1 overflows from the overflow pipe 31 , the height of the liquid level in the chassis 1 is located at the lower edge of the pipe opening of the overflow pipe 31 .

[0056] In the step 3), when the temperature sensor 23 detects that the temperature of the water in the chassis is much lower than the lower limit of the temperature to be reached by the material to be pasteurized, the processor controls the valve of the heat source outlet branch pipe 22 connected to one end of the circulating liquid inlet pipe 13 flowing into the heat exchange sleeve 19 to open, and the valve of the other heat source outlet branch pipe 22 connected to the middle part of the side wall of the heat exchange sleeve 19 to close, and then the heat source and the water temperature in the circulating liquid inlet pipe 13 passing through the heat exchange sleeve 19 are increased through the heat source inlet pipe 20, and the water in the chassis 1 is continuously circulated through the circulating pump 12, so that the water temperature in the chassis is rapidly increased. Temperature increase; when the temperature sensor 23 detects that the water temperature in the chassis 1 reaches the lower limit of the pasteurization temperature range of the material to be pasteurized, the processor controls the valve of the heat source outlet branch pipe 22 connected to one end of the circulating liquid inlet pipe 13 flowing into the heat exchange sleeve 19 to close, and the valve of the other heat source outlet branch pipe 22 connected to the middle part of the side wall of the heat exchange sleeve 19 to open, and then the heat source and the water temperature in the circulating liquid inlet pipe 13 passing through the heat exchange sleeve 19 are increased through the heat source inlet pipe 20, and the water in the chassis 1 is continuously circulated through the circulating pump 12, so that the water temperature in the chassis is accurately increased.

[0057] In the step 2), the filling pipe 18 fills water into the chassis 1 until the liquid level is flush with the bottom pipe opening of the overflow pipe 31, and the water filling is stopped. In the step 5), when the placement rack 27 is placed in the chassis 1, the liquid level in the chassis 1, which was originally flush with the bottom pipe edge of the overflow pipe 31, rises due to the placement rack 27. When the liquid level rises, the water in the chassis 1 will flow out of the chassis 1 through the overflow pipe 31 again.

[0058] In the step 6), the pasteurization temperature range of the material to be pasteurized is divided into a lower temperature range, an intermediate temperature range and an upper temperature range in order from low to high temperatures; when the water temperature in the chassis 1 detected by the temperature sensor 23 is within the pasteurization temperature range and close to the lower temperature range, the heat source flow rate of the heat source pipe 20 is increased to improve the heat exchange efficiency of the heat exchange sleeve 19, thereby preventing the water temperature in the chassis 1 from being lower than the pasteurization temperature range, and returning the water temperature in the chassis 1 to the intermediate temperature range of the pasteurization temperature range; when the water temperature in the chassis 1 detected by the temperature sensor 23 is within the pasteurization temperature range and close to the lower temperature range, the heat source flow rate of the heat source pipe 20 is increased to improve the heat exchange efficiency of the heat exchange sleeve 19, thereby preventing the water temperature in the chassis 1 from being lower than the pasteurization temperature range, and returning the water temperature in the chassis 1 to the intermediate temperature range of the pasteurization temperature range; When the water temperature in the chassis 1 detected by the temperature sensor 23 is in the middle temperature area within the pasteurization temperature range, the heat source flow rate entering the heat source pipe 20 is increased to improve the heat exchange efficiency of the heat exchange sleeve 19, thereby avoiding the water temperature in the chassis 1 from being higher than the pasteurization temperature range and returning the water temperature in the chassis 1 to the middle temperature area within the pasteurization temperature range.

[0059] When the temperature difference between the upper and lower limits of the pasteurization temperature range of the material to be pasteurized is greater than or equal to 6 degrees Celsius, the boundary temperature value A between the lower temperature limit area and the middle temperature area is 3 degrees Celsius higher than the lower temperature limit, and the boundary temperature value B between the upper temperature limit area and the middle temperature area is 2 degrees Celsius lower than the upper temperature limit; when the temperature difference between the upper and lower limits of the pasteurization temperature range of the material to be pasteurized is less than 6 degrees Celsius, the boundary temperature value A between the lower temperature limit area and the middle temperature area is the sum of the lower temperature limit and 40% of the difference between the upper and lower temperatures, and the boundary temperature value B between the upper temperature limit area and the middle temperature area is the difference between the upper temperature limit and 20% of the difference between the upper and lower temperatures.

[0060] The process used in the pasteurization method of the meat packaged food of this embodiment is as follows: Before placing the material into the chassis 1, the cover A2 and the cover B3 are respectively moved to the two ends of the chassis 1, so that the cover A2 and the cover B3 close the top opening of the chassis 1; then water is injected into the chassis 1 through the liquid adding pipe 18, and the circulation pump 12 is turned on at the same time, so that the water in the chassis 1 can fill the circulation pipeline including the circulation liquid inlet pipe 13 and the circulation liquid return pipe 14. When the circulation pipeline is full of water, the circulation pump 12 is turned off; when the water in the chassis 1 overflows from the overflow pipe 31, the liquid adding pipe 18 stops injecting water into the chassis 1, and the height of the liquid level in the chassis 1 is located at the lower edge of the pipe mouth of the overflow pipe 31; when the temperature sensor 23 detects that the temperature of the water in the chassis is much lower than the temperature to be reached by the material to be pasteurized Within a time limit, the processor controls the circulation pump 12 to start again, and controls the valve of the heat source outlet branch pipe 22 connected to one end of the circulation liquid inlet pipe 13 flowing into the heat exchange sleeve 19 to open, and the valve of another heat source outlet branch pipe 22 connected to the middle part of the side wall of the heat exchange sleeve 19 to close, and then the heat source and the water temperature in the circulation liquid inlet pipe 13 passing through the heat exchange sleeve 19 are increased through the heat source inlet pipe 20, and the water in the chassis 1 is continuously circulated through the circulation pump 12, so that the water temperature in the chassis is rapidly increased; when the temperature sensor 23 detects that the water temperature in the chassis 1 reaches the lower limit of the pasteurization temperature range of the material to be pasteurized, the processor controls the valve of the heat source outlet branch pipe 22 connected to one end of the circulation liquid inlet pipe 13 flowing into the heat exchange sleeve 19 to close. , the valve of another heat source outlet branch pipe 22 connected to the middle of the side wall of the heat exchange sleeve 19 is opened, and then the heat source and the water temperature in the circulating liquid inlet pipe 13 passing through the heat exchange sleeve 19 are increased through the heat source inlet pipe 20, and the water in the chassis 1 is continuously circulated through the circulating pump 12, so that the water temperature in the chassis is accurately increased; when the temperature sensor 23 detects that the water temperature in the chassis 1 reaches the upper limit of the pasteurization temperature range of the material to be pasteurized, the cover plate A2 is moved to the maximum stroke facing the cover plate B3 or the cover plate B3 is moved to the maximum stroke facing the cover plate A2. At this time, the top of the chassis 1 is open on one side of the spray pipe 6, and the placement rack 27 filled with material trays 28 of each layer from top to bottom to be pasteurized is placed by a hanger. Lift it and put it into the case 1 from the open opening, and make the supporting legs at the bottom of the placement rack 27 correspond to the top surface of the placement block 26, so as to ensure that the placement rack 27 can be stably placed in the case 1, and then separate the lifting fixture of the lifting device from the placement rack 27; in the process of placing the placement rack 27 into the case 1, the bottom pipe edge of the case 1 that was originally flush with the overflow pipe 31, the liquid level in the case 1 rises due to the placement of the placement rack 27, and when the liquid level rises, the water in the case 1 will flow out of the case 1 through the overflow pipe 31 again, until the placement rack 27 is placed and fixed in the case 1, at this time, the cover plate A2 and the cover plate B3 are moved to the two ends of the case 1 again, so that the cover plate A2 and the cover plate B3 close the top opening of the case 1;When the placement rack 27 is placed in the chassis 1, the materials in the material trays 28 of each layer of the placement rack 27 can be immediately at the pasteurization temperature, and at the same time, the water temperature in the chassis 1 where the placement rack 27 is placed will also be slightly reduced. However, since each spray pipe 6 horizontally sprays the hot water heated by the heat exchange sleeve 19 to the materials of each layer of the material trays 28 of the placement rack 27, and the sprayed hot water passes through the materials of the corresponding side material trays 28 and then enters the return liquid tank 8 on the corresponding side of the chassis 1 through the return liquid hole 9, and then enters the circulation return liquid pipe 14 through the return liquid branch pipe 15, and finally enters the circulation liquid inlet pipe 13 again through the circulation pump 12, and passes through the heat exchange sleeve 19 again to heat the water in the circulation liquid inlet pipe 13. After being heated, the water in the circulation liquid inlet pipe 13 enters the spray pipe 6 again, and is sprayed to the materials of the corresponding layer of the material tray 28 through the spray pipe 6 again, so that the water temperature around the material is still within the pasteurization temperature range. When the water temperature in the chassis 1 detected by the temperature sensor 23 is in the pasteurization temperature range close to the lower limit temperature area, the heat source flow rate of the heat source pipe 20 is increased to improve the heat exchange efficiency of the heat exchange sleeve 19, thereby preventing the water temperature in the chassis 1 from being lower than the pasteurization temperature range and returning the water temperature in the chassis 1 to the middle temperature area of ​​the pasteurization temperature range; when the water temperature in the chassis 1 detected by the temperature sensor 23 is in the middle temperature area of ​​the pasteurization temperature range, the heat source flow rate of the heat source pipe 20 is reduced to return the heat exchange efficiency of the heat exchange sleeve 19 to the initial state, thereby stabilizing the water temperature in the chassis 1 within the middle temperature area of ​​the pasteurization temperature range; when the water temperature in the chassis 1 detected by the temperature sensor 23 is in the pasteurization temperature range close to the upper limit temperature area, the heat source flow rate of the heat source pipe 20 is increased to improve the heat exchange efficiency of the heat exchange sleeve 19, thereby preventing the water temperature in the chassis 1 from being higher than the pasteurization temperature range and returning the water temperature in the chassis 1 to the middle temperature area of ​​the pasteurization temperature range. When the placement rack 27 has been placed in the chassis 1 for the required time for pasteurization, the cover A2 is moved to the maximum stroke facing the cover B3 or the cover B3 is moved to the maximum stroke facing the cover A2. At this time, the top of the side where the pasteurized placement rack 27 is placed in the chassis 1 is open. The pasteurized placement rack 27 is lifted by the lifting device and lifted away from the chassis 1 from the open part. The placement rack 27 and the materials on the material trays 28 fixed to the placement rack 27 are transferred to the cooling equipment to quickly cool the materials, thereby finally achieving pasteurization of the materials. This facilitates refrigeration and cold chain transportation of materials. ;

[0061] After the placement racks 27 are placed on both sides of the liquid spraying pipe 6 in the chassis 1, the liquid level in the chassis 1 will also increase, causing the water in the chassis 1 to overflow from the overflow pipe 31, and finally the height of the liquid level in the chassis 1 will remain at the lower edge of the pipe mouth of the overflow pipe 31; when the placement rack 27 on one side of the chassis 1 is lifted off the chassis 1, the liquid level in the chassis 1 will drop. When the liquid level in the chassis 1 is stable, the height of the liquid level in the chassis 1 is still higher than the top height of the placement rack 27 placed in the chassis 1.

[0062] A liquid level sensor may also be provided in the chassis 1, and the liquid level sensor is electrically connected to the processor. When the liquid level after the liquid adding pipe 18 fills the chassis 1 with water reaches the liquid level sensor, the liquid adding pipe 18 stops filling the chassis 1 with water. At this time, the amount of water in the chassis 1 can make the liquid level in the chassis 1 lower than or equal to the bottom pipe opening of the overflow pipe 31 after one placement rack 27 is placed and fixed in the chassis 1 or two placement racks 27 are placed and fixed in the chassis 1.

[0063] By immediately subjecting the food material placed in the cabinet to water within the pasteurization temperature range, pasteurization is initiated, thereby performing pasteurization as quickly as possible and improving the efficiency of sterilization.

[0064] The circulating heating method will not change the amount of water in the chassis, so that the materials on the placement rack are always within the pasteurization temperature range, always ensuring the pasteurization effect.

[0065] According to the change of water temperature in the chassis, the heat exchange effect can be changed through different flow rates and heat exchange degrees of the heat source, thereby providing different heating effects on the packaging product materials under different conditions.

[0066] When the food material is in different temperature ranges of pasteurization, the heat source heats the water in the circulating liquid inlet pipe to different degrees through different heat exchange effects, so that the water entering the chassis always meets the pasteurization requirements.

[0067] By injecting water into the chassis to the bottom of the overflow pipe, it is ensured that there is enough space between the top of the placement rack and the liquid surface, so as to avoid the top of the placement rack being close to the liquid surface, causing the water temperature in the corresponding area where the material on the top is located to drop due to excessive contact with the outside world, thereby affecting the pasteurization effect.

Claims

1. Pasteurizer with multi-layer material tray placement rack, characterized by: The invention comprises a case (1) with an open top, wherein a plurality of liquid spraying pipes (6) are provided in the middle of the case (1) from bottom to top and are respectively connected to a circulating liquid inlet pipe (13), wherein the liquid sprayed by the liquid spraying pipes (6) is respectively sprayed horizontally toward the side walls at both ends of the case (1), and the side walls at both ends of the case (1) are respectively provided with liquid return devices connected to a circulating liquid return pipe (14), wherein the liquid return devices are respectively provided with a plurality of liquid return holes (9) corresponding to the liquid spraying pipes (6), and the liquid in the circulating liquid return pipe (14) enters the circulating liquid return pipe (14) through a circulating pump (12). In the circulating liquid inlet pipe (13), the portion of the circulating liquid inlet pipe (13) located outside the chassis (1) passes through a heating device, and the placement racks (27) on which multiple layers of materials are placed are respectively placed at positions between the liquid spraying pipe (6) and the side wall of the chassis (1), and the liquid sprayed horizontally by the liquid spraying pipe (6) is sprayed to the materials of each layer of the material tray (28) placed on the placement rack (27), and a temperature sensor (23) is also provided on the upper part of the side wall of the chassis (1), and the temperature sensor (23) is lower than the liquid level in the chassis (1).

2. The pasteurizer of the multi-layer material tray placement rack according to claim 1, characterized in that: Each liquid spray pipe (6) is provided with two groups of liquid spray nozzles (7), and the two groups of liquid spray nozzles (7) spray liquid toward the materials on the corresponding material trays (28) on both sides of the liquid spray pipe (6) respectively; each group of liquid spray nozzles (7) is provided with a plurality of liquid spray nozzles (7), which are distributed along the extension direction of the liquid spray pipe (6).

3. The pasteurizer of the multi-layer material tray placement rack according to claim 1, characterized in that: The liquid return holes (9) are provided in a plurality of groups at positions corresponding to the positions of the liquid sprayed by each liquid spraying pipe (6), each group of liquid return holes (9) is provided in a plurality of rows along a direction perpendicular to the extension of the liquid spraying pipe (6), and each row of liquid return holes (9) is provided with a plurality of liquid return holes (9) evenly along a direction parallel to the extension of the liquid spraying pipe (6).

4. The pasteurizer of the multi-layer material tray placement rack according to claim 1 or 3, characterized in that: The liquid return device comprises a liquid return groove (8) fixed to the side wall of the end where the chassis (1) is located, the groove of the liquid return groove faces away from the liquid spray pipe (6) and is sealed and fixed to the chassis (1), the liquid return hole (9) is arranged at the bottom of the liquid return groove (8), the circulating liquid return pipe (14) is connected to the liquid return branch pipe (15) through a tee, and the liquid return branch pipe (15) is upward from the bottom plate (4) of the chassis (1) and the position corresponding to the liquid return device, respectively passing through the bottom plate (4) and the bottom groove wall of the liquid return groove (8) and then connected to the inside of the liquid return groove (8).

5. The pasteurizer of the multi-layer material tray placement rack according to claim 4, characterized in that: The portion of the liquid return branch pipe (15) located in the liquid return tank is connected to a plurality of liquid return branch pipes from bottom to top, the number and position of the liquid return branch pipes respectively corresponding to the respective liquid spray pipes (6), and a strip hole is provided on one side of the liquid return branch pipe facing the liquid return hole (9) of the liquid return tank along the extension direction of the liquid return branch pipe.

6. The pasteurizer of the multi-layer material tray placement rack according to claim 1, characterized in that: The heating device comprises a heat exchange sleeve (19) coaxially wrapped and fixed to the outer wall of a circulating liquid inlet pipe (13); the circulating liquid inlet pipe (13) corresponds to a tube bundle formed by a plurality of parallel thin unit tubes in the heat exchange sleeve (19); connectors are provided at both ends of the tube bundle; the connectors seal and connect the corresponding ends of the thin unit tubes to the circulating liquid inlet pipe (13); the side wall of the heat exchange sleeve (19) is located at the point where the circulating liquid inlet pipe (13) flows out of the heat exchange sleeve. One end of the tube (19) is connected to a heat source inlet tube (20), and the side wall of the heat exchange sleeve (19) is also connected to a heat source outlet tube (21). The heat source outlet tube (21) is respectively connected to two heat source outlet branch tubes (22), one of which is connected to an end of the side wall of the heat exchange sleeve (19) where the circulating liquid inlet tube (13) flows into the heat exchange sleeve (19), and the other heat source outlet branch tube (22) is connected to the middle part of the side wall of the heat exchange sleeve (19).

7. The pasteurizer of the multi-layer material tray placement rack according to claim 6, characterized in that: The thin unit tube is a spiral tube, and the spiral axis of the spiral tube is coaxially arranged with the circulating liquid inlet pipe (13) connected to the two ends of the heat exchange sleeve (19).

8. The pasteurizer of the multi-layer material tray placement rack according to claim 1, characterized in that: The top of the side wall of the chassis (1) is connected to a liquid adding pipe (18), the bottom plate (4) at the bottom of the chassis (1) is connected to a liquid draining pipe (16), and the upper part of the side wall of the chassis (1) is connected to an overflow pipe (31), the overflow pipe (31) being located at a height higher than the topmost material of the placement rack (27) placed in the chassis (1).

9. The pasteurizer of the multi-layer material tray placement rack according to claim 8, characterized in that: The bottom plate (4) is tilted downward from both sides to the middle to form a "V"-shaped structure, the drainage pipe (16) is located at the bottom of the "V"-shaped structure, and a filtering device (17) is provided at the connection between the drainage pipe (16) and the bottom plate (4).

10. The pasteurizer of the multi-layer material tray placement rack according to claim 9, characterized in that: The top of the bottom plate (4) is provided with a positioning block (26) for placing the supporting legs of the connecting placement frame (27), and the top surfaces of the positioning blocks (26) located on the same side of the liquid spraying pipe (6) are flush and horizontal.

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