A birch sap concentration production device

Abstract

The utility model discloses a birch juice concentration production device, including jar body, stirring device, the middle lower part in jar body is stirring chamber, and the upper part in jar body forms the isolated chamber of isolation with stirring chamber, be equipped with top cover, isolated cover on jar body, and motor is assembled in the top of top cover through mounting support subassembly, and the cylindrical distributor of open upper end, lower end closure is arranged in the flange connection of feeding pipe, and top cover, isolated cover, stirring device, mounting support subassembly form integral type assembly on jar body, through integral assembly mode, convenient installation to jar body, and can obtain certain guarantee on installation precision. Through isolated chamber, reduce the heat radiation of stirring chamber heat continue to go upwards, reduce the heat loss in jar body. Through the bottom all around of cylindrical distributor to the spraying type distribution juice in stirring chamber, to increase the mixing ability with the juice in jar body, thereby promote the temperature rise uniformity and efficiency of juice, also corresponding promotion concentration efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of birch sap processing technology, specifically relating to a birch sap concentration production device. Background Technology

[0002] With the increasing demand for natural and healthy beverages, natural plant juices such as birch sap are gradually gaining popularity in the market. Birch sap is a natural beverage extracted from birch trees, rich in vitamins, minerals, and other bioactive substances, and has high nutritional value and health benefits.

[0003] After birch sap is collected, it needs to be concentrated at high temperatures. Existing concentration devices generally include a tank, a stirring motor, a stirrer, and a heater. The tank has inlet and outlet ports for adding and discharging sap. The stirring motor is installed on the top of the tank, the stirrer is inside the tank, and the heater heats the tank. The sap enters the tank directly through the inlet, is stirred by the stirrer, and is concentrated by the heater. Because the sap is added directly into the tank, the mixing between sap entering the tank sequentially is insufficient. Furthermore, since the motor is directly installed on the top of the tank, heat radiates from inside the tank towards the top during high-temperature concentration. Under prolonged high-temperature operation, this can negatively impact the motor. Based on these findings, further research and development are warranted for birch sap concentration production equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a birch sap concentration production device that is easy to maintain, has increased mixing capacity, and enhances concentration capacity.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A birch sap concentration production device includes a tank body, with a feed port at the upper end and a discharge port at the lower end. A feed pipe connecting flange is fitted on the feed port, and a discharge valve is installed in the discharge port. A heating device is installed on the outer shaft of the tank body, and a stirring device is installed inside the tank body. The stirring device includes a motor and a stirrer. The heating device is located in the lower middle part of the outer periphery of the tank body. The lower middle part of the tank body is a stirring chamber, and an isolation chamber is formed in the upper middle part of the tank body, which is isolated from the stirring chamber.

[0007] An isolation cover plate is arranged horizontally in the upper middle part of the tank body, and a top cover plate is arranged horizontally at the top of the tank body. The above-mentioned isolation chamber is formed between the upper surface of the isolation cover plate and the lower surface of the top cover plate.

[0008] The motor is mounted on top of the top cover via a mounting bracket assembly;

[0009] A cylindrical distributor with an open upper end and a closed lower end is provided in the feed pipe connecting flange. The cylindrical distributor includes an annular fixing part and a cylindrical distribution body. An annular step is provided on the inner circumference of the upper end face of the feed pipe connecting flange for the annular fixing part to be inserted. The lower end of the cylindrical distribution body passes through the top cover plate and the isolation cover plate and is located in the stirring chamber. Several distribution holes are opened on the outer peripheral wall of the end of the cylindrical distribution body located in the stirring chamber to connect the interior of the cylindrical distribution body with the stirring chamber.

[0010] The top cover, isolation cover, stirring device, and mounting bracket assembly are integrally assembled onto the tank body;

[0011] The tank is connected to a steam exhaust pipe, which connects to the stirring chamber located between the lower surface of the isolation cover and the heating device. A steam exhaust valve is installed on the steam exhaust pipe.

[0012] Multiple connecting columns of the same height are welded and fixed between the lower surface of the top cover plate and the upper surface of the isolation cover plate.

[0013] As a further embodiment, the mounting bracket assembly includes two end connecting blocks, two connecting crossbeams, two intermediate fixing longitudinal beams, and two end fixing longitudinal beams;

[0014] Two connecting beams are arranged horizontally and spaced apart above the top cover plate, two intermediate fixed longitudinal beams are fixedly set between the middle of the two connecting beams, and two end connecting blocks are fixed to the ends of the two connecting beams respectively.

[0015] The motor is mounted on two intermediate fixed crossbeams; at least one of the connecting crossbeams, intermediate fixed longitudinal beams, and end fixed longitudinal beams is welded to the upper surface of the top cover plate.

[0016] Two end connecting blocks are fixedly installed on the outside of the two end fixing longitudinal beams, and mounting connecting blocks are fixedly installed on both sides of the upper outer wall of the tank. The mounting connecting blocks and the end connecting blocks are fixedly connected by bolts.

[0017] As a further implementation, the inner diameter of the feed pipe connecting flange is smaller than the outer diameter of the annular fixing part, and the outer diameter of the retaining ring and sealing ring is smaller than the inner diameter of the feed pipe connecting flange.

[0018] Through holes are provided on the upper and lower surfaces of the spacer cover plate, and the inner diameter of the through holes is adapted to the outer diameter of the cylindrical distributor.

[0019] As a further implementation, the height of the annular fixing part is equal to the distance between the bottom surface of the annular step and the upper end face of the feed pipe connecting flange;

[0020] A retaining ring is fixedly installed on the outer periphery of the cylindrical distributor above the spacer cover plate. A sealing ring is fitted on the cylindrical distributor body below the retaining ring. The upper end of the sealing ring fits against the lower surface of the retaining ring, and the lower end fits against the upper surface of the spacer cover plate.

[0021] As a further embodiment, a transparent observation tube is fixedly connected to the outer periphery of the tank. The lower end of the observation tube communicates with the bottom of the stirring chamber, and the upper end communicates with the top of the stirring chamber.

[0022] As a further implementation, a closed-loop annular support platform is fixedly installed in the upper part of the tank body, and the outer edge of the lower surface of the spacer cover plate fits against the upper surface of the annular support platform.

[0023] An annular insertion ring is fixedly installed on the outer periphery of the lower surface of the spacer cover plate, and the outer diameter of the insertion ring is adapted to the inner diameter of the annular support platform.

[0024] By adopting the above technical solution, the beneficial effects of this utility model compared with the prior art are as follows:

[0025] 1. This application enables the top cover plate, isolation cover plate, stirring device, and mounting bracket assembly to be integrally assembled onto the tank body. By adopting an integral method, it can be easily installed onto the tank body, and the installation accuracy can be guaranteed to a certain extent.

[0026] 2. This application forms an isolation chamber in the upper middle part of the tank to isolate the stirring chamber from the motor. Most of the steam generated by the concentration is concentrated at the top of the stirring chamber, and the heat is relatively concentrated. Thus, the isolation chamber reduces the upward heat radiation of the stirring chamber, reducing heat loss in the tank. The design of the isolation chamber can also reduce the impact of heat on the motor temperature rise, providing a certain degree of protection for the motor.

[0027] 3. This application can spray the juice to be concentrated from the bottom of the cylindrical distributor towards the mixing chamber through the cylindrical distributor, so as to increase the mixing capacity with the juice in the tank, thereby improving the temperature rise uniformity and efficiency of the juice, and correspondingly improving the concentration capacity and efficiency. Attached Figure Description

[0028] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0029] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0030] Figure 2This is an internal sectional view of the present invention;

[0031] Figure 3 This is a schematic diagram of the top cover plate and the spacer cover plate in this utility model;

[0032] Figure 4 The figure shows a schematic diagram of the cylindrical distributor of this utility model.

[0033] In the diagram: 1. Tank body, 2. Feed port, 3. Feed pipe connecting flange, 4. Discharge valve, 5. Heating device, 6. Motor, 7. Stirring chamber, 8. Isolation chamber, 9. Isolation cover plate, 10. Top cover plate, 11. Cylindrical distributor, 12. Annular fixing part, 13. Cylindrical distributor body, 14. Annular step, 15. Distribution hole, 16. Mounting bracket assembly, 17. Steam discharge pipe, 18. Connecting column, 19. End connecting block, 20. Connecting crossbeam, 21. Intermediate fixed longitudinal beam, 22. End fixed longitudinal beam, 23. Mounting connecting block, 24. Retaining ring, 25. Sealing ring, 26. Observation tube, 27. Annular support platform, 28. Insertion ring, 29. Stirring shaft, 30. Upper stirring blade, 31. Lower stirring blade. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Please see Figures 1-4 This utility model provides the following technical solution: a birch sap concentration production device, including a cylindrical tank 1 with an open top forming a flush opening, i.e., the top of the tank 1 is open and the opening height of the upper end is the same. The upper end of the tank 1 is provided with a feeding port 2 and the lower end is provided with a discharge port. A feeding pipe connecting flange 3 is installed on the feeding port 2. A discharge valve 4 is installed in the discharge port to control the discharge of concentrated sap from the tank 1. The feeding port 2 is used to add pre-filtered sap into the tank 1. A feeding valve and a flow meter are installed in sequence above the feeding pipe connecting flange 3. That is, the control valve is installed on the feeding pipe connecting flange 3 and the flow meter is installed above the control valve. The flow meter is used to monitor the flow rate of the sap added into the tank 1 to obtain the amount of sap added into the tank 1. When the set amount of sap is added, the control valve closes.

[0036] A heating device 5 is installed on the outer shaft of the tank body 1. The heating device 5 is used to heat the inside of the tank body 1. The heating device 5 can adopt existing heating methods such as steam heating or electric heating. A stirring device is installed inside the tank body 1. The stirring device includes a motor 6 and a stirrer that extends into the tank body 1. The output end of the motor 6 is connected to the stirrer. The stirrer stirs the juice in the tank body 1, accelerates the temperature rise of the juice, and improves the concentration process.

[0037] The heating device 5 is located in the lower middle part of the outer periphery of the tank body 1. The lower middle part of the tank body 1 is the stirring chamber 7. The juice added from outside the tank body 1 enters the stirring chamber 7. An isolation chamber 8 is formed in the upper middle part of the tank body 1, which is isolated from the stirring chamber 7. The height of the isolation chamber 8 is 20-30 cm. It is used to isolate the stirring chamber 7 from the position of the motor. Most of the steam generated by the concentration is concentrated at the top of the stirring chamber 7. The heat is relatively concentrated. Therefore, the heat radiation from the stirring chamber 7 to the top is reduced by the isolation chamber 8, which reduces the heat loss in the tank body 1. The design of the isolation chamber 8 can also reduce the impact of heat on the motor temperature rise, and play a certain role in protecting the motor.

[0038] A circular, horizontally arranged isolation cover plate 9 is provided in the upper middle part of the tank body 1. A circular, horizontally arranged top cover plate 10 is provided at the top of the tank body 1. The isolation chamber 8 is formed between the upper surface of the isolation cover plate 9 and the lower surface of the top cover plate 10. The top cover plate 10 is used to seal the upper opening of the tank body 1. An annular groove can be provided on the outer periphery of the lower surface of the top cover plate 10 for insertion into the upper opening of the tank body 1. A sealing ring can also be provided to enhance the sealing ability between the top cover plate 10 and the upper opening of the tank body 1. The outer diameter of the isolation cover plate 9 is adapted to the inner diameter of the tank body 1, that is, only an assembly gap is maintained between the outer periphery of the isolation cover plate 9 and the inner wall of the tank body 1.

[0039] A cylindrical distributor 11, open at the top and closed at the bottom, is provided in the feeding pipe connecting flange 3. The cylindrical distributor 11 includes an annular fixing part 12 and a cylindrical distribution body 13. An annular step 14 for inserting the annular fixing part 12 is provided on the inner circumference of the upper end face of the feeding pipe connecting flange 3. The lower end of the cylindrical distribution body 13 passes through the top cover plate 10 and the isolation cover plate 9 and is located in the stirring chamber 7. Several distribution holes 15 are provided on the outer peripheral wall of the end of the cylindrical distribution body 13 located in the stirring chamber 7 to connect the interior of the cylindrical distribution body 13 with the stirring chamber 7. The juice flows into the stirring chamber 7 through the cylindrical distributor 11 and is sprayed into the stirring chamber 7 through the bottom periphery of the cylindrical distributor 11 to increase the mixing capacity with the juice in the tank 1. The cylindrical distributor 13 at the lower end of the cylindrical distributor 11 is not below the juice in the tank 1. That is, when the juice is added to the tank 1 to the set height, the cylindrical distributor 13 is above the juice surface.

[0040] The motor is mounted on top of the top cover plate 10 via the mounting bracket assembly 16. The top cover plate 10, the isolation cover plate 9, the stirring device, and the mounting bracket assembly 16 are integrally assembled on the tank body 1. The control valve is disassembled to separate it from the feed pipe connecting flange 3 and removed from the top of the tank body 1. By adopting an integral method, it can be easily installed on the tank body 1, ensuring a certain level of installation accuracy and facilitating subsequent removal of the entire assembly from the tank body 1 for maintenance.

[0041] A steam exhaust pipe 17 is connected to the tank body 1. The steam exhaust pipe 17 connects to the stirring chamber 7 between the lower surface of the isolation cover plate 9 and the heating device 5. That is, the height of the steam exhaust pipe 17 is also set above the liquid surface formed when the juice is added to the tank body 1 to a set height. A steam exhaust valve 4 is installed on the steam exhaust pipe 17. When it is necessary to discharge the concentrated steam in the stirring chamber 7, the steam exhaust valve 4 is opened, and the steam is discharged from the steam exhaust pipe 17 to the outside of the tank body 1.

[0042] Four connecting posts 18 of the same height are welded and fixed between the lower surface of the top cover plate 10 and the upper surface of the isolation cover plate 9, so that the top cover plate 10 and the isolation cover plate 9 are fixedly connected. The top cover plate 10 and the isolation cover plate 9 are parallel in the horizontal direction. When the top cover plate 10 and the isolation cover plate 9 are installed in the tank body 1, the cover plates remain parallel to the radial horizontal direction of the tank body 1.

[0043] The mounting bracket assembly 16 includes two end connecting blocks 19, two connecting crossbeams 20, two intermediate fixing longitudinal beams 21, and two end fixing longitudinal beams 22. The two connecting crossbeams 20, two intermediate fixing longitudinal beams 21, and two end fixing longitudinal beams 22 form a U-shaped bracket. The length of the connecting crossbeams 20 is greater than the diameter of the top cover plate 10. The two connecting crossbeams 20 are arranged transversely and spaced above the top cover plate 10. The two intermediate fixing longitudinal beams 21 are welded and fixed between the middle sections of the two connecting crossbeams 20 at intervals. The two end connecting blocks 19 are respectively fixed to the two end connecting blocks 19. Below the end of the connecting crossbeam 20; the motor is bolted to the two intermediate fixed crossbeams. When the motor is equipped with a reducer, the reducer is mounted on the two intermediate fixed crossbeams. The connecting crossbeam 20, the intermediate fixed longitudinal beam 21, and the end fixed longitudinal beam 22 are all welded to the upper surface of the top cover plate 10. Two end connecting blocks 19 are respectively fixed on the outside of the two end fixed longitudinal beams 22. Mounting connecting blocks 23 are fixed on both sides of the upper outer wall of the tank body 1. The mounting connecting blocks 23 and the end connecting blocks 19 are fixedly connected by bolts. Of course, the top cover plate 10 and the upper open end of the tank body 1 can also be fixedly connected by a flange connection to enhance the connection strength between the top cover plate 10 and the tank body 1. During use, the top cover plate 10 can be installed and disassembled by assembling and removing it from the tank body 1.

[0044] The inner diameter of the feed pipe connecting flange 3 is smaller than the outer diameter of the annular fixing part 12. The annular fixing part 12 can be hung above the feed pipe connecting flange 3. The outer diameter of the retaining ring and the sealing ring is smaller than the inner diameter of the feed pipe connecting flange 3, so that the cylindrical distribution body 13 can extend downward through the feed pipe connecting flange 3.

[0045] Through holes are provided on the upper and lower surfaces of the spacer cover plate. The inner diameter of the through hole is adapted to the outer diameter of the cylindrical distributor 13, that is, only the assembly gap is left between the outer periphery of the cylindrical distributor 13 and the inner wall of the through hole. The height of the annular fixing part 12 is equal to the distance between the bottom surface of the annular step 14 and the upper end surface of the feeding pipe connecting flange 3. When the cylindrical distributor 11 is installed in the feeding port 2 and its lower end is also installed in place, the upper end surface of the annular fixing part 12 is flush with the upper end surface of the feeding pipe connecting flange 3. It is pressed by the lower end surface of the upper flange of the feeding valve subsequently installed on the feeding pipe connecting flange 3, thereby forming an effective stable limit for the annular fixing part 12.

[0046] A retaining ring 24 is fixedly installed on the outer periphery of the cylindrical distributor 13 above the spacer cover plate. A sealing ring 25 is fitted on the cylindrical distributor 13 below the retaining ring 24. The upper end of the sealing ring 25 fits against the lower surface of the retaining ring 24, and the lower end fits against the upper surface of the spacer cover plate. When the cylindrical distributor 11 is assembled, the height of the lower end face of the retaining ring 24 from the upper surface of the spacer cover plate is less than the thickness of the sealing ring. This allows the sealing ring to have a certain downward pressure during installation, increasing the contact area between the sealing ring and the lower surface of the retaining ring 24 and the upper surface of the spacer cover plate, thus increasing the sealing surface and improving the sealing ability at this point. The sealing ring is a food-grade silicone sealing ring.

[0047] A transparent observation tube 26 is fixedly connected to the outer periphery of the tank body 1. The lower end of the observation tube 26 communicates with the bottom of the stirring chamber 7, and the upper end communicates with the top of the stirring chamber 7. The connection position of the upper end of the observation tube 26 is between the liquid surface formed when the sap is added to the tank body 1 to a set height and the lower surface of the spacer cover, so that the staff can observe the level and condition of the birch sap in the tank body 1 from the outside.

[0048] An annular support platform 27, which forms a closed opening around the inner circumference of the tank 1, is fixedly installed in the upper part of the tank body 1. The outer edge of the lower surface of the spacer cover plate is in contact with the upper surface of the annular support platform 27 to form a seal.

[0049] An annular insertion ring 28 is fixedly installed on the outer periphery of the lower surface of the spacer cover. The outer diameter of the insertion ring 28 is adapted to the inner diameter of the annular support platform 27. To increase the sealing capacity, a sealing ring can also be fitted around the outer periphery of the insertion ring 28. The inner ring of the sealing ring fits against the outer periphery of the insertion ring 28, the upper end fits against the lower surface of the cover on the outer side of the insertion ring 28, and the lower end fits against the upper surface of the annular support platform 27. The length of the insertion ring 28 extending downward toward the spacer cover is more than twice the thickness of the annular support platform 27, thereby ensuring the effective length of the insertion ring 28 inserted into the annular support platform 27 and the stability of the sealing ring assembly. When the top cover 10 is assembled in place, that is, when the upper end face of the annular fixing part 12 is flush with the upper end face of the feeding pipe connecting flange 3, the sealing rings fitted on the cylindrical distribution body 13 and the sealing rings fitted on the insertion ring 28 are both compressed and form an effective fit with the sealing surface of their respective parts.

[0050] The agitator in this application includes a stirring shaft 29, upper stirring blades 30, and lower stirring blades 31. The upper end of the stirring shaft 29 is connected to a motor, and the lower end extends through the top cover plate 10 and the spacer cover plate into the stirring chamber 7. At least between the stirring shaft 29 and the spacer cover plate, an existing rotary shaft sealing structure can be used for sealing. The upper stirring blades 30 are inclined plates with a left-high and right-low orientation, and the lower stirring blades 31 are inclined plates with a left-low and right-high orientation. That is, by arranging the upper and lower stirring blades 31 in different inclination directions, the juice in the tank 1 can achieve multi-directional flow, which helps to stir and mix the juice in the tank 1. Three upper stirring blades 30 are welded to the stirring shaft 29 and distributed on the outer periphery of the middle part of the stirring shaft 29. One lower stirring blade 31 is welded to the stirring shaft 29 and is fixedly set on the lower outer periphery of the stirring shaft 29. The upper stirring blade 30 is smaller than the inner diameter of the retaining ring 24, but larger than the size of the lower stirring blade 31. The upper stirring blade 30 plays the main stirring role, while the lower stirring blade 31 plays the auxiliary stirring role of reverse disturbance of the juice flow direction.

[0051] When using this device for birch sap concentration, the pre-filtered birch sap is introduced into the feeding pipe. The flow rate of the added sap is detected by a flow meter. When the set amount of sap to be added is reached, the feeding valve is closed to stop the addition. During the addition process, the heating device 5 is activated, and the stirring device is also in stirring mode. The sap added into the tank 1 through the cylindrical distributor 11 can be distributed by spraying, effectively mixing the subsequently added sap with the previously added sap. This ensures that the temperature of the later added sap rises steadily and evenly, allowing the birch sap to be heated evenly during the concentration process, accelerating evaporation and concentration, thereby shortening the production time. Furthermore, the high-temperature concentration process can sterilize the birch sap, resulting in sterile concentrated birch sap exiting from the tank 1.

[0052] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A birch sap concentration production apparatus, comprising a tank body, a feed port at the upper end and a discharge port at the lower end of the tank body, a feed pipe connecting flange fitted to the feed port, a discharge valve installed in the discharge port, a heating device mounted on the outer shaft of the tank body, and a stirring device mounted inside the tank body, the stirring device comprising a motor and a stirrer, the heating device being located in the lower middle part of the outer periphery of the tank body, the lower middle part of the tank body being a stirring chamber, and an isolation chamber isolated from the stirring chamber being formed in the upper middle part of the tank body; characterized in that... A horizontally arranged isolation cover is provided in the upper middle part of the tank body, and a horizontally arranged top cover is provided at the top of the tank body. The above-mentioned isolation chamber is formed between the upper surface of the isolation cover and the lower surface of the top cover. The motor is mounted on top of the top cover via a mounting bracket assembly; A cylindrical distributor with an open upper end and a closed lower end is provided in the feed pipe connecting flange. The cylindrical distributor includes an annular fixing part and a cylindrical distribution body. An annular step is provided on the inner circumference of the upper end face of the feed pipe connecting flange for the annular fixing part to be inserted. The lower end of the cylindrical distribution body passes through the top cover plate and the isolation cover plate and is located in the stirring chamber. Several distribution holes are opened on the outer peripheral wall of the end of the cylindrical distribution body located in the stirring chamber to connect the interior of the cylindrical distribution body with the stirring chamber. The top cover, isolation cover, stirring device, and mounting bracket assembly are integrally assembled onto the tank body; The tank is connected to a steam exhaust pipe, which connects to the stirring chamber between the lower surface of the isolation cover and the heating device. A steam exhaust valve is installed on the steam exhaust pipe.

2. The birch sap concentration production apparatus as described in claim 1, characterized in that, Multiple connecting columns of the same height are welded and fixed between the lower surface of the top cover plate and the upper surface of the isolation cover plate.

3. The birch sap concentration production apparatus as described in claim 1, characterized in that, The mounting bracket assembly includes two end connecting blocks, two connecting crossbeams, two intermediate fixing longitudinal beams, and two end fixing longitudinal beams; Two connecting beams are arranged horizontally and spaced apart above the top cover plate, two intermediate fixed longitudinal beams are fixedly set between the middle of the two connecting beams, and two end connecting blocks are fixed to the ends of the two connecting beams respectively. The motor is mounted on two intermediate fixed crossbeams; at least one of the connecting crossbeams, intermediate fixed longitudinal beams, and end fixed longitudinal beams is welded to the upper surface of the top cover plate. Two end connecting blocks are fixedly installed on the outside of the two end fixing longitudinal beams, and mounting connecting blocks are fixedly installed on both sides of the upper outer wall of the tank. The mounting connecting blocks and the end connecting blocks are fixedly connected by bolts.

4. The birch sap concentration production apparatus as described in claim 1, characterized in that, The inner diameter of the feed pipe connecting flange is smaller than the outer diameter of the annular fixing part, and the outer diameter of the retaining ring and sealing ring is smaller than the inner diameter of the feed pipe connecting flange. Through holes are provided on the upper and lower surfaces of the spacer cover plate, and the inner diameter of the through holes is adapted to the outer diameter of the cylindrical distributor.

5. The birch sap concentration production apparatus as described in claim 1, characterized in that, The height of the annular fixing part is equal to the distance between the bottom surface of the annular step and the upper end face of the feed pipe connecting flange; A retaining ring is fixedly installed on the outer periphery of the cylindrical distributor above the spacer cover plate. A sealing ring is fitted on the cylindrical distributor body below the retaining ring. The upper end of the sealing ring fits against the lower surface of the retaining ring, and the lower end fits against the upper surface of the spacer cover plate.

6. The birch sap concentration production apparatus as described in claim 1, characterized in that, A transparent observation tube is fixedly connected to the outer periphery of the tank. The lower end of the observation tube is connected to the bottom of the stirring chamber, and the upper end is connected to the top of the stirring chamber.

7. The birch sap concentration production apparatus as described in claim 1, characterized in that, A closed-loop annular support platform is fixedly installed in the upper part of the tank body, and the outer edge of the lower surface of the spacer cover plate fits against the upper surface of the annular support platform. An annular insertion ring is fixedly installed on the outer periphery of the lower surface of the spacer cover plate, and the outer diameter of the insertion ring is adapted to the inner diameter of the annular support platform.

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