Astragalus coffee double-effect concentration equipment based on integrated efficient heat exchange module

Abstract

The invention relates to the technical field of liquid concentration, in particular to astragalus coffee double-effect concentration equipment based on an integrated efficient heat exchange module, which comprises a material pipe, a first-effect evaporator, a lower communicating pipe, a first-effect liquid storage device, a return device, a second-effect evaporator, a second-effect liquid storage device, a condenser, a pipe group, an upper communicating pipe and a liquid mixing module, the first-effect evaporator comprises a secondary air cavity, a primary air cavity and a liquid cavity from top to bottom, an upper port and a lower port of the pipe set are communicated with the secondary air cavity and the liquid cavity respectively, the upper communicating pipe is installed between the first-effect evaporator and the side wall of the first-effect liquid storage device, the secondary air cavity is communicated with the upper communicating pipe, and the liquid adjusting module comprises a lead screw, a liquid adjusting plate and a motor. The lead screw penetrates through an upper cover of the first-effect liquid storage device, and the liquid adjusting plate is installed on the lead screw. By controlling the liquid level in the liquid storage device and accelerating evaporation of the coffee liquid while controlling, the purpose that the height of the liquid level of the coffee in the evaporator is constant is achieved, and the coffee concentration efficiency is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid concentration, and in particular to an astragalus coffee dual-effect concentration device based on an integrated high-efficiency heat exchange module. Background Art

[0002] With the increasingly rapid pace of life, coffee is gradually becoming a necessity. Among them, solid coffee is widely favored due to its portability and easy brewing characteristics. In order to improve the easy brewing characteristics of solid coffee (i.e., the speed of complete dissolution in the solvent), in the industrial production process, the coffee bean raw materials will undergo seven steps: roasting, grinding, extraction, concentration, drying, crushing and drying. In the above process, the roasted coffee beans are first ground into small particles, and then extracted to obtain coffee liquid. The water in the coffee liquid is then removed by concentration. Finally, the freeze-dried coffee ice plate is crushed and dried at the same time to obtain the final product that can be packaged. The process of converting coffee beans into coffee liquid is relatively simple, while the process of further obtaining coffee powder from coffee liquid is quite cumbersome. The concentration process is the first step in converting coffee liquid into coffee powder. This process is not only energy-intensive, but the concentration degree and concentration efficiency of the coffee liquid in this process will have a direct impact on the subsequent processes.

[0003] Equipment used for coffee concentration typically consists of an evaporator and a condenser. The evaporator contains a reservoir of coffee liquid. When high-temperature steam is introduced into the evaporator, it causes the coffee liquid to boil, thereby evaporating the water content in the coffee liquid (to improve evaporation efficiency, the pressure in the evaporator is typically below standard atmospheric pressure). The steam discharged from the evaporator enters the condenser, where it is cooled and discharged as a liquid, thereby continuously reducing the water content in the coffee liquid, achieving concentration. However, relying on the evaporator to simultaneously store and evaporate the coffee liquid reduces the efficiency of coffee concentration for the following reasons: the larger the amount of coffee liquid stored in the evaporator, the more heat is required to boil the coffee liquid, which in turn increases the lead-in waiting period for the concentration process and consumes a large amount of energy in the subsequent process of maintaining the large amount of coffee liquid boiling. The smaller the amount of coffee liquid stored in the evaporator, the more frequent the evaporator's loading and unloading processes must be, which significantly increases the concentration cycle. Furthermore, the frequent loading and unloading of coffee liquid also results in heat loss in the steam, which compromises the energy-saving characteristics of the concentration equipment.

[0004] In order to release the heat exchange and evaporation performance of the evaporator, the prior art usually sets up a liquid reservoir to share the storage function of the evaporator; the evaporator and the liquid reservoir are connected at the bottom, and when feeding, the vacuum suction is carried out inside the two, and when concentrating, the liquid levels inside the two are consistent. Then, after the liquid in the evaporator evaporates, it is transferred from the inside of the liquid reservoir to the evaporator according to the principle of communicating vessels; and in order to make the heat exchange and evaporation process of the concentration equipment more energy-saving, the prior art also sets up two sets of evaporators and liquid reservoirs in the concentration equipment (usually modified as "single effect" and "double effect"). In this double-effect concentration equipment, the steam discharged from the first-effect evaporator is not directly discharged into the condenser, but enters the second-effect evaporator after passing through the first-effect liquid reservoir to provide energy for the boiling of the coffee liquid inside the second-effect evaporator (to ensure the boiling effect of the coffee liquid inside the second-effect evaporator, the internal pressure of the second-effect evaporator is usually lower than the internal pressure of the first-effect evaporator), thereby realizing the further utilization of the secondary steam inside the first-effect evaporator.

[0005] However, as the concentration process continues, the total amount of coffee liquid in the evaporator and the liquid reservoir continues to decrease, that is, the liquid level inside the evaporator is constantly decreasing. This means that under the premise that the amount of steam introduced into the evaporator remains unchanged, the content of secondary steam generated by the evaporation of coffee liquid in the evaporator in the same period of time is gradually decreasing. Therefore, as the concentration process proceeds, the concentration efficiency gradually decreases, and as the content of secondary steam generated by the first-effect evaporator decreases, the boiling degree of the coffee liquid in the second-effect evaporator will also slow down accordingly, thereby further reducing the second-effect concentration efficiency.

[0006] Therefore, an Astragalus coffee dual-effect concentration device based on an integrated high-efficiency heat exchange module was proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide an Astragalus coffee dual-effect concentration device based on an integrated high-efficiency heat exchange module, which solves the problem that the liquid level in the evaporator continues to decrease during the concentration process, thereby reducing the coffee concentration efficiency. By controlling the liquid level inside the liquid reservoir and accelerating the evaporation of the coffee liquid while controlling, the purpose of maintaining a constant coffee liquid level in the evaporator is achieved, and the efficiency of coffee concentration is further improved.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The Astragalus coffee double-effect concentration equipment based on the integrated high-efficiency heat exchange module includes a material pipe, a first-effect evaporator, a lower connecting pipe, a first-effect liquid reservoir, a reverser, a second-effect evaporator, a second-effect liquid reservoir and a condenser. The bottoms of the first-effect evaporator and the first-effect liquid reservoir are connected to the lower connecting pipe, the lower connecting pipe is connected to the material pipe, and the two reversers are respectively connected between the first-effect liquid reservoir and the second-effect liquid reservoir and between the second-effect liquid reservoir and the condenser. It also includes a pipe group, an upper connecting pipe and a liquid adjustment module. The first-effect evaporator includes secondary gas from top to bottom. The first-effect evaporator and the first-effect liquid reservoir are connected to each other, and the secondary air cavity and the liquid cavity are connected. The liquid regulating module includes a lead screw, a liquid regulating plate and a motor. The lead screw passes through the upper cover of the first-effect liquid reservoir, the liquid regulating plate is installed on the lead screw, and the output shaft of the motor is connected to the upper end of the lead screw;

[0010] The coffee liquid in the tube group is heated by the water vapor discharged from the air inlet pipe and evaporates. The liquid and steam coffee flow through the lower connecting pipe and the upper connecting pipe respectively. The liquid regulating plate moves up and down to adjust the liquid level of the tube group.

[0011] Preferably, the upper section of the liquid regulating plate is configured as a frustum structure with a small diameter facing upward, and the lower section of the liquid regulating plate is configured as a conical structure;

[0012] In the above scheme, the setting of the frustum structure of the upper part of the liquid regulating plate is conducive to the upward discharge of the coffee liquid vapor inside the first-effect liquid reservoir; the setting of the conical structure of the lower part of the liquid regulating plate effectively reduces the resistance of the liquid regulating plate to immerse in the coffee liquid in the first-effect liquid reservoir, thereby reducing the energy consumption of the motor and improving the energy efficiency of the concentration equipment.

[0013] A major advantage of solid coffee is that multiple ingredients can be mixed during the production process to enhance its flavor and functionality. For example, our company's Astragalus coffee not only retains the refreshing properties of coffee, but also uses the Astragalus ingredient to achieve a tonifying effect. Because both coffee and Astragalus ultimately form granular solids, to ensure a uniform blend and enhance the taste, they must be mixed in liquid form after the extraction process.

[0014] Preferably, the liquid regulating module further comprises a guide rod and an impeller, wherein the guide rod and the lead screw are both rotatably connected to the interior of the first-effect liquid reservoir, and both the guide rod and the lead screw pass through the liquid regulating plate, and the circumferences of the guide rod and the lead screw are both provided with threads, and the pitch of the guide rod thread is greater than the pitch of the lead screw thread, and the impeller is rotatably connected to the liquid regulating plate;

[0015] In the above scheme, the liquid regulating plate is driven by the motor to move the lead screw and guided by the guide rod to guide the liquid regulating plate, so as to achieve the up and down sliding of the liquid regulating plate inside the first-effect liquid reservoir; and through the setting of the thread on the guide rod, while the lead screw rotates to drive the liquid regulating plate to move up and down, the sliding liquid regulating plate will further drive the guide rod to rotate, and then through the joint rotation of the guide rod and the lead screw, the coffee liquid inside the first-effect liquid reservoir is stirred, so that the astragalus component and the coffee particles in the coffee are more evenly mixed, so as to improve the taste of the coffee. Furthermore, the pitch of the guide rod thread is large in order to reduce the power required for the guide rod to drive the liquid regulating plate.

[0016] Preferably, the guide rod and the lead screw are respectively located on the front and rear sides of the liquid regulating plate, the impeller is located between the guide rod and the lead screw, and the impeller is located on the left side of the liquid regulating plate, the impeller rotates in the front-to-back direction, and the upper connecting pipe is arranged in the left-to-right direction;

[0017] In the above solution, the impeller is driven by the coffee steam discharged from the upper connecting pipe. When it rotates, it draws up the coffee liquid inside the first-effect liquid reservoir, thereby increasing the contact area between the coffee liquid and the high-temperature steam, so that the coffee liquid inside the first-effect liquid reservoir also participates in the evaporation process, thereby improving the efficiency of coffee liquid concentration; and the steam discharged from the upper connecting pipe is smoothly deflected by the impeller and does not directly hit the wall of the first-effect liquid reservoir cavity or the coffee liquid surface, thereby avoiding the influence of the reaction force after the steam collision on the discharge efficiency of the upper connecting pipe.

[0018] Preferably, the impeller includes a hub and blades, the hub is rotatably connected to the liquid regulating plate, a plurality of blades are arranged in a circular array on the outer ring of the hub, and the radial surfaces of the blades are all set to be conical surfaces;

[0019] In the above solution, the conical surface setting of the radial surface of the blade disperses the steam discharged from the upper connecting pipe, making the steam more evenly distributed above the coffee liquid, so that it can be discharged more smoothly from the gap between the liquid regulating plate and the first-effect liquid reservoir, thereby making the steam circulation process more efficient; and reduces the resistance of the blades to the coffee liquid, so that the impeller rotates faster, thereby carrying a larger volume of coffee liquid, thereby improving the evaporation efficiency of the coffee liquid inside the first-effect liquid reservoir.

[0020] Preferably, the upper connecting pipe comprises an outward-expanding section, a smooth section and an inward-contracting section from left to right, the inner diameter of the outward-expanding section gradually increases from left to right, the inner diameter of the smooth section is consistent, and the inner diameter of the inward-contracting section gradually decreases from left to right;

[0021] In the above scheme, the change in the inner diameter of the expanded section allows the steam inside the tube group to enter the upper connecting tube more quickly; the smooth inner diameter of the smooth section eliminates turbulence in the steam entering the upper connecting tube at high speed; and the change in the inner diameter of the contracted section increases the power of the upper connecting tube to discharge steam, thereby increasing the impeller speed, thereby further improving the efficiency of evaporation of coffee liquid inside the first-effect liquid reservoir.

[0022] Preferably, the tube group includes a connecting plate, a straight tube and a curved tube, the connecting plate is arranged in a semicircular structure, and a plurality of connecting plates are staggeredly connected to the cavity wall of the primary air cavity, the straight tube and the curved tube both vertically pass through the plurality of connecting plates, and the upper ends of the straight tube and the curved tube are both connected to the secondary air cavity, the lower end of the straight tube is connected to the liquid cavity, and the lower end of the curved tube is connected to the outer expansion section;

[0023] In the above solution, the staggered arrangement of the connecting plates on the primary air cavity causes the steam entering the primary air cavity along the air inlet pipe to spiral downward, thereby making the steam heat the coffee liquid inside the straight pipe and the curved pipe more uniformly. The directional movement of the steam also avoids steam turbulence, thereby improving the heat exchange efficiency of the pipe group and making the coffee liquid evaporate more efficiently.

[0024] Preferably, a sensor is installed on the inner upper wall of the first-effect evaporator, the probe of the sensor is facing the inner cavity of the straight tube, and the motor has servo performance;

[0025] In the above solution, the sensor detects the liquid level, and the motor rotates according to the real-time data of the sensor to control the height of the liquid regulating plate, so that the liquid level inside the straight tube is always a constant value.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention provides a liquid conditioning module and coordinates a motor in the module with a sensor. The sensor monitors the coffee liquid level inside the tube group in real time. The motor rotates based on the monitoring data to drive the liquid conditioning plate in the liquid conditioning module downward, thereby maintaining the liquid level inside the first-effect liquid reservoir. Furthermore, through the communicating vessel principle, the liquid level in the tube group of the first-effect evaporator is kept constant, thereby ensuring that the concentration equipment always operates efficiently.

[0028] 2. The present invention provides a guide rod to guide the upward and downward sliding movement of the liquid regulating plate, and the guide rod is rotatably connected to the interior of the first-effect liquid reservoir. Then, through the threads on the guide rod, the lead screw rotates to drive the liquid regulating plate downward, and the liquid regulating plate drives the guide rod to rotate through the thread engagement. As a result, during the concentration process, the lead screw and the guide rod both keep rotating to stir the coffee liquid inside the first-effect liquid reservoir, so that the various components in the coffee liquid are mixed more evenly.

[0029] 3. The present invention provides an impeller on the liquid regulating plate, and aligns the right end of the inwardly contracted section of the upper communicating tube with the blades of the impeller, so that the steam discharged from the upper communicating tube drives the impeller to rotate, thereby causing the steam to further evaporate the coffee liquid on the blades, thereby improving the concentration efficiency of the equipment. The rotation of the impeller avoids the collision of the steam discharged from the circulation tube with the liquid surface or cavity wall of the first-effect liquid reservoir, thereby optimizing the flow path of the steam inside the first-effect liquid reservoir, thereby making the steam flow process more efficient, and thus making the concentration process of the second-effect evaporator and the second-effect liquid reservoir more efficient.

[0030] 4. The present invention configures both radial surfaces of the blades as conical surfaces, which not only reduces the resistance of the blades to immersion in the coffee liquid, but also allows the steam discharged from the upper connecting pipe to diffuse toward the inner circumferential surface of the first-effect liquid reservoir after contacting the radial surfaces of the blades, thereby avoiding steam congestion at the outlet of the upper connecting pipe and making the steam flow process more efficient. In addition, the upper section of the liquid regulating plate is configured as a frustum with the smaller diameter at the top, thereby constructing a gap between the liquid regulating plate and the cavity wall of the first-effect liquid reservoir that gradually increases upward, so that the steam diffused through the radial surfaces of the blades can be discharged more smoothly upward. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall front view structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the overall isometric structure of the present invention;

[0033] Figure 3 For the present invention Figure 1 A magnified schematic diagram of part A;

[0034] Figure 4 For the present invention Figure 2 A magnified schematic diagram of part B;

[0035] Figure 5 For the present invention Figure 4 The enlarged schematic diagram of part C in the middle;

[0036] Figure 6 For the present invention Figure 3 The enlarged schematic diagram of part D in the middle;

[0037] Figure 7 For the present invention Figure 4 The enlarged schematic diagram of part E in the middle;

[0038] Figure 8 It is a schematic diagram of the steam and liquid flow circuit of the present invention.

[0039] In the figure: 1. material pipe; 2. first-effect evaporator; 21. secondary air cavity; 22. primary air cavity; 221. air inlet pipe; 23. liquid cavity; 3. lower connecting pipe; 4. first-effect liquid reservoir; 5. reverser; 6. second-effect evaporator; 7. second-effect liquid reservoir; 8. condenser; 9. pipe group; 91. connecting plate; 92. straight pipe; 93. curved pipe; 10. upper connecting pipe; 101. outward expansion section; 102. smooth section; 103. inward contraction section; 11. liquid adjustment module; 111. screw; 112. liquid adjustment plate; 113. motor; 114. guide rod; 115. impeller; 1151. hub; 1152. blade; 12. sensor. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] See also Figures 1 to 8 The present invention provides an astragalus coffee dual-effect concentration device based on an integrated high-efficiency heat exchange module. The technical solution is as follows:

[0042] The Astragalus coffee double-effect concentration equipment based on the integrated high-efficiency heat exchange module includes a material pipe 1, a first-effect evaporator 2, a lower connecting pipe 3, a first-effect liquid reservoir 4, a reverser 5, a second-effect evaporator 6, a second-effect liquid reservoir 7, a condenser 8, a pipe group 9, an upper connecting pipe 10 and a liquid adjustment module 11. The bottoms of the first-effect evaporator 2 and the first-effect liquid reservoir 4 are connected to the lower connecting pipe 3, and the lower connecting pipe 3 is connected to the material pipe 1. The two reversers 5 are respectively connected between the first-effect liquid reservoir 4 and the second-effect evaporator 6 and between the second-effect liquid reservoir 7 and the condenser 8; refer to Figure 8 When feeding, the inlet below the feed pipe 1 is opened, and a vacuum environment is provided inside the first-effect evaporator 2, the first-effect liquid reservoir 4, the second-effect evaporator 6, and the second-effect liquid reservoir 7 to absorb the coffee liquid in the feed pipe 1 into their own interiors. After the feeding is completed, the valve on the lower connecting pipe 3 is closed to discharge the residual coffee liquid in the feed pipe 1, thereby preventing the concentrated coffee liquid from being diluted during discharge; the first-effect evaporator 2 includes a secondary air chamber 21, a primary air chamber 22, and a liquid chamber 23 from top to bottom. An air inlet pipe 221 is installed on the side wall of the primary air chamber 22. The tube group 9 is installed inside the secondary air chamber 21, the primary air chamber 22 and the liquid chamber 23, and the upper and lower ports of the tube group 9 are connected to the secondary air chamber 21 and the liquid chamber 23 respectively. The upper connecting pipe 10 is installed between the side walls of the first-effect evaporator 2 and the first-effect liquid reservoir 4. The secondary air chamber 21 and the upper connecting pipe 10 are connected. The height of the air inlet pipe 221 is higher than the coffee liquid level inside the tube group 9, so that the high-temperature steam can completely wrap the liquid part in the tube group 9, thereby achieving efficient and uniform heating of the coffee liquid, thereby improving the concentration efficiency of the equipment; refer to Figure 8During concentration, high-temperature water vapor is introduced into the primary air cavity 22 from the air inlet pipe 221. The coffee liquid in the tube group 9 is continuously boiled by the high-temperature water vapor in the primary air cavity 22, and then the coffee liquid is discharged from the upper port of the tube group 9 into the secondary air cavity 21 in the form of steam (the water vapor will be converted into liquid water after heat exchange. In order to discharge the liquid water, a drain valve is usually provided at the bottom of the cavity wall of the first-effect evaporator 2). Then, the coffee vapor is introduced into the upper connecting pipe 10 connected to the secondary air cavity 21 to be discharged into the first-effect liquid reservoir 4. The coffee vapor discharged into the first-effect liquid reservoir 4 rises and enters the reverser 5. The reverser 5 is provided with a valve to further separate the gas and liquid in the vapor and return the liquid to the first-effect liquid reservoir. 4, allowing the gas to enter the second-effect evaporator 6 to provide heat for the second-effect concentration. The interiors of the second-effect evaporator 6 and the second-effect liquid reservoir 7 respectively maintain the same design as the first-effect evaporator 2 and the first-effect liquid reservoir 4. The coffee vapor after the second-effect concentration is discharged from the inverter 5 between the second-effect liquid reservoir 7 and the condenser 8 into the condenser 8, thereby converting the coffee vapor into liquid in the condenser 8 and discharging it from the condenser 8 in the form of liquid; the liquid adjustment module 11 includes a screw 111, a liquid adjustment plate 112 and a motor 113. The screw 111 passes through the upper cover of the first-effect liquid reservoir 4, the liquid adjustment plate 112 is mounted on the screw 111, and the output shaft of the motor 113 is connected to the upper end of the screw 111;

[0043] The coffee liquid in the tube group 9 is heated by the water vapor discharged from the air inlet pipe 221 and evaporates. The liquid and vapor coffee flow through the lower connecting pipe 3 and the upper connecting pipe 10 respectively. The liquid regulating plate 112 moves up and down to adjust the liquid level in the tube group 9.

[0044] As an embodiment of the present invention, refer to Figure 1 and Figure 3 The upper section of the liquid regulating plate 112 is configured as a truncated cone structure with a smaller diameter facing upward, and the lower section of the liquid regulating plate 112 is configured as a conical structure. At the start of concentration, the coffee liquid level inside the first-effect liquid reservoir 4 is flush with the interface between the truncated cone and the cone of the liquid regulating plate 112. As the coffee liquid inside the first-effect evaporator 2 evaporates, the total amount of coffee liquid continues to decrease. To prevent the coffee liquid level inside the tube group 9 from decreasing, the liquid regulating plate 112 is driven downward by the motor 113 to compensate for the liquid level. To make it easier for the liquid regulating plate 112 to enter the coffee liquid and save effort when moving upward, thereby further improving the energy efficiency of the equipment, the overall density of the liquid regulating plate 112 should be slightly greater than the density of the coffee liquid (this density refers to the density after the coffee is concentrated).

[0045] As an embodiment of the present invention, refer to Figure 2 and Figure 4The liquid adjusting module 11 also includes a guide rod 114 and an impeller 115. The guide rod 114 and the lead screw 111 are both rotatably connected to the inside of the first-effect liquid reservoir 4, and the guide rod 114 and the lead screw 111 both penetrate the liquid adjusting plate 112. The circumferential surfaces of the guide rod 114 and the lead screw 111 are threaded, and the pitch of the guide rod 114 thread is greater than the pitch of the lead screw 111 thread, and the impeller 115 is rotatably connected to the liquid adjusting plate 112; food-grade bearings are arranged between the guide rod 114 and the first-effect liquid reservoir 4, and between the lead screw 111 and the first-effect liquid reservoir 4. In addition to realizing the rotatable connection between the guide rod 114 and the lead screw 111, the hygienic standards of coffee production can also be guaranteed; in addition, a fan-like device can be installed at the lower end of the guide rod 114 and the lead screw 111 to strengthen the stirring effect of the guide rod 114 and the lead screw 111 on the coffee liquid inside the first-effect liquid reservoir 4, thereby making the mixing of the various components in the coffee liquid more uniform.

[0046] As an embodiment of the present invention, refer to Figure 3 and Figure 4 The guide rod 114 and the lead screw 111 are respectively located on the front and rear sides of the liquid regulating plate 112, the impeller 115 is located between the guide rod 114 and the lead screw 111, and the impeller 115 is located on the left side of the liquid regulating plate 112, the impeller 115 rotates in the front-to-back direction, and the upper connecting pipe 10 is arranged in the left-to-right direction; during the concentration process, the coffee steam is discharged from the upper connecting pipe 10 into the first-effect liquid reservoir 4 to drive the impeller 115 to rotate. In order to keep the impeller 115 rotating throughout the entire process, twice the value of the rotation radius of the impeller 115 should be greater than the stroke of the liquid regulating plate 112.

[0047] As an embodiment of the present invention, refer to Figure 5 The impeller 115 includes a hub 1151 and blades 1152. The hub 1151 is rotatably connected to the liquid regulating plate 112. A plurality of blades 1152 are arranged in a circular array on the outer ring of the hub 1151. The radial surfaces of the blades 1152 are all configured as conical surfaces. In this manner, in order to guide the coffee vapor discharged from the upper connecting pipe 10 to the gap between the first-effect liquid reservoir 4 and the liquid regulating plate 112, the radial surfaces of the blades 1152 are configured as conical surfaces that are thin at the front and rear sides and thick in the middle. The greater the taper of the radial surface of the blades 1152, the smoother the circulation of the coffee vapor, and accordingly, the better the energy saving performance of the equipment.

[0048] As an embodiment of the present invention, refer to Figure 6 The upper connecting pipe 10 includes an outward expansion section 101, a smooth section 102 and an inward contraction section 103 from left to right. The inner diameter of the outward expansion section 101 gradually increases from left to right, the inner diameter of the smooth section 102 is consistent, and the inner diameter of the inward contraction section 103 gradually decreases from left to right.

[0049] As an embodiment of the present invention, refer to Figure 3 and Figure 6, the tube group 9 includes a connecting plate 91, a straight tube 92 and a bent tube 93. The connecting plate 91 is set to a semicircular structure, and multiple connecting plates 91 are staggered and connected to the cavity wall of the primary air cavity 22. The straight tube 92 and the bent tube 93 vertically penetrate the multiple connecting plates 91, and the upper ends of the straight tube 92 and the bent tube 93 are both connected to the secondary air cavity 21, the lower end of the straight tube 92 is connected to the liquid cavity 23, and the lower end of the bent tube 93 is connected to the expansion section 101; in order to improve the efficiency of the secondary air cavity 21 discharging into the expansion section 101, the upper end of the bent tube 93 is higher than the upper end of the straight tube 92; the vertical part of the bent tube 93 is threadedly connected to the bent part. During assembly, the vertical part of the bent tube 93 and the straight tube 92 are first welded to each connecting plate 91, and a blocking plate is welded to the upper and lower ends of the welded body after welding is completed (refer to Figure 3 The upper end block is used to separate the secondary air cavity 21 and the primary air cavity 22, and the lower end block is used to separate the primary air cavity 22 and the liquid cavity 23), and then the welding body is inserted into the single-effect evaporator 2, and then the upper and lower blocking plates are welded to the cavity wall of the single-effect evaporator 2, and finally the bent part of the elbow 93 is connected to the vertical part.

[0050] As an embodiment of the present invention, refer to Figure 7 A sensor 12 is installed on the inner upper wall of the first-effect evaporator 2, and the probe of the sensor 12 is facing the inner cavity of the straight tube 92. The motor 113 has servo performance.

[0051] Working Principle: The present invention is provided with a liquid regulating plate 112 and a sensor 12 above the tube group 9 to monitor the liquid level inside the tube group 9 in real time. Under the cooperation of the sensor 12 and the motor 113, the liquid regulating plate 112 is adjusted in real time in the vertical direction of the first-effect liquid reservoir 4, thereby making the liquid level inside the first-effect liquid reservoir 4 always consistent. Correspondingly, according to the communicating vessel principle, the liquid level inside the tube group 9 is consistent with the liquid level inside the first-effect liquid reservoir 4, so the liquid level inside the tube group 9 is also always consistent; and an impeller 115 and a guide rod 114 are respectively mounted on the liquid regulating plate 112. The impeller 115 cooperates with the upper communicating tube 10 to allow the coffee liquid inside the first-effect liquid reservoir 4 to also participate in the evaporation process, thereby improving the concentration efficiency of the equipment. The guide rod 114, in addition to guiding the liquid regulating plate 112, stirs the coffee liquid by self-rotation, so that the various components in the coffee liquid are mixed more evenly, thereby improving the coffee taste.

[0052] Specifically, in order to reduce the resistance of the liquid regulating plate 112 when entering the coffee liquid and improve the energy efficiency of the device, the lower section of the liquid regulating plate 112 is set to a conical structure;

[0053] In order to keep the guide rod 114 rotating during the concentration process, so as to stir the coffee liquid together with the lead screw 111, thereby making the various components in the coffee liquid mixed more evenly, thereby improving the coffee taste; the guide rod 114 is rotatably connected to the inside of the first-effect liquid reservoir 4, and a thread is provided on the circumference of the guide rod 114. The motor 113 drives the lead screw 111, and the guide rod 114 guides the liquid regulating plate 112, so that the liquid regulating plate 112 slides up and down inside the first-effect liquid reservoir 4. The threaded arrangement on the guide rod 114 allows the lead screw 111 to rotate to drive the liquid regulating plate 112 to move up and down. At the same time, the sliding liquid regulating plate 112 will further drive the guide rod 114 to rotate, and then the guide rod 114 and the lead screw 111 rotate together to stir the coffee liquid inside the first-effect liquid reservoir 4, so that the astragalus component and coffee particles in the coffee are mixed more evenly, thereby improving the coffee taste;

[0054] In order to rotate the impeller 115 to draw up the coffee liquid in the first-effect liquid reservoir 4, and thereby allow the coffee liquid to participate in evaporation under the action of the steam discharged from the upper connecting pipe 10, thereby improving the concentration efficiency of the device, the impeller 115 is rotatably connected to the liquid regulating plate 112 and rotated in the front-to-back direction, thereby arranging the connecting pipe in the left-to-right direction. During concentration, the impeller 115 is driven by the coffee steam discharged from the upper connecting pipe 10 and draws up the coffee liquid in the first-effect liquid reservoir 4 during rotation, thereby increasing the contact area between the coffee liquid and the high-temperature steam, thereby allowing the coffee liquid in the first-effect liquid reservoir 4 to participate in the evaporation process, thereby improving the concentration efficiency of the coffee liquid.

[0055] To increase the speed of the impeller 115 and thereby evacuate a larger volume of coffee liquid, thereby further improving the concentration efficiency of the device, an expanded section 101, a smooth section 102, and a contracted section 103 are arranged from left to right within the upper connecting tube 10. The gradually increasing inner diameter of the expanded section 101 from left to right allows steam from the tube assembly 9 to enter the upper connecting tube 10 more quickly. The smooth inner diameter of the smooth section 102 eliminates turbulence in the steam entering the upper connecting tube 10 at high speed. The gradually decreasing inner diameter of the contracted section 103 from left to right increases the power of the upper connecting tube 10 to discharge steam, thereby increasing the speed of the impeller 115 and further improving the evaporation efficiency of the coffee liquid within the first-effect liquid reservoir 4.

[0056] In order to optimize the flow path of the steam inside the first-effect liquid reservoir 4, so that the steam inside the first-effect liquid reservoir 4 can be more efficiently discharged into the second-effect evaporator 6, thereby improving the efficiency of the second-effect concentration; the radial surface of the blade 1152 of the impeller 115 is set to a conical surface, so that the steam discharged from the upper connecting pipe 10 diffuses toward the inner circumferential surface of the first-effect liquid reservoir 4 after contacting the radial surface of the blade 1152, so as to avoid congestion of steam at the outlet of the upper connecting pipe 10, thereby making the steam flow process more efficient, and the upper section of the liquid regulating plate 112 is set to a truncated cone structure with the smaller diameter at the top, thereby constructing a gap between the liquid regulating plate 112 and the cavity wall of the first-effect liquid reservoir 4 that gradually increases upward, so that the steam diffused through the radial surface of the blade 1152 can be discharged upward more smoothly;

[0057] In order to make the heat exchange of the internal tube group 9 of the first-effect evaporator 2 more efficient and enable all parts to effectively participate in the heat exchange process, thereby improving the concentration efficiency of the equipment; multiple connecting plates 91 are staggered and connected to the cavity wall of the primary air cavity 22, so that the steam entering the primary air cavity 22 along the air inlet pipe 221 spirals down. This makes the steam heat the coffee liquid inside the straight tube 92 and the curved tube 93 more evenly, and the directional movement of the steam avoids steam turbulence, thereby improving the heat exchange efficiency of the tube group 9, thereby evaporating the coffee liquid more efficiently.

[0058] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An Astragalus coffee double-effect concentration device based on an integrated high-efficiency heat exchange module comprises a feed pipe (1), a first-effect evaporator (2), a lower connecting pipe (3), a first-effect liquid reservoir (4), a reverser (5), a second-effect evaporator (6), a second-effect liquid reservoir (7) and a condenser (8), characterized in that: The invention also includes a tube group (9), an upper connecting pipe (10) and a liquid regulating module (11); the first-effect evaporator (2) includes a secondary air cavity (21), a primary air cavity (22) and a liquid cavity (23) from top to bottom; an air inlet pipe (221) is installed on the side wall of the primary air cavity (22); the tube group (9) is installed inside the secondary air cavity (21), the primary air cavity (22) and the liquid cavity (23); and the upper and lower ports of the tube group (9) are respectively connected to the secondary air cavity (21) and the liquid cavity (23); The upper connecting pipe (10) is installed between the side walls of the first-effect evaporator (2) and the first-effect liquid reservoir (4); the secondary air cavity (21) is connected to the upper connecting pipe (10); the liquid regulating module (11) comprises a lead screw (111), a liquid regulating plate (112) and a motor (113); the lead screw (111) passes through the upper cover of the first-effect liquid reservoir (4); the liquid regulating plate (112) is installed on the lead screw (111); and the output shaft of the motor (113) is connected to the upper end of the lead screw (111); The coffee liquid in the tube group (9) is heated by the water vapor discharged from the air inlet pipe (221) and evaporates, and the liquid and steam coffee flow through the lower connecting pipe (3) and the upper connecting pipe (10) respectively. The liquid regulating plate (112) moves up and down to adjust the liquid level of the tube group (9).

2. The Astragalus coffee dual-effect concentration device based on an integrated high-efficiency heat exchange module according to claim 1 is characterized in that: The upper section of the liquid regulating plate (112) is configured as a truncated cone structure with a small diameter facing upward, and the lower section of the liquid regulating plate (112) is configured as a conical structure.

3. The Astragalus coffee dual-effect concentration device based on an integrated high-efficiency heat exchange module according to claim 2 is characterized in that: The liquid regulating module (11) further comprises a guide rod (114) and an impeller (115); the guide rod (114) and the lead screw (111) are both rotatably connected to the interior of the first-effect liquid reservoir (4); the guide rod (114) and the lead screw (111) both penetrate the liquid regulating plate (112); threads are provided on the circumferences of the guide rod (114) and the lead screw (111); the pitch of the thread of the guide rod (114) is greater than the pitch of the thread of the lead screw (111); and the impeller (115) is rotatably connected to the liquid regulating plate (112).

4. The Astragalus coffee dual-effect concentration device based on an integrated high-efficiency heat exchange module according to claim 3 is characterized in that: The guide rod (114) and the lead screw (111) are respectively located on the front and rear sides of the liquid regulating plate (112); the impeller (115) is located between the guide rod (114) and the lead screw (111), and the impeller (115) is located on the left side of the liquid regulating plate (112); the impeller (115) rotates in the front-rear direction; and the upper connecting pipe (10) is arranged in the left-right direction.

5. The Astragalus coffee dual-effect concentration device based on an integrated high-efficiency heat exchange module according to claim 4 is characterized in that: The impeller (115) comprises a hub (1151) and blades (1152). The hub (1151) is rotatably connected to the liquid regulating plate (112). A plurality of blades (1152) are arranged in a circular array on the outer ring of the hub (1151). The radial surfaces of the blades (1152) are all configured as conical surfaces.

6. The Astragalus coffee dual-effect concentration device based on an integrated high-efficiency heat exchange module according to claim 4 is characterized in that: The upper connecting pipe (10) comprises an outward-expanding section (101), a smooth section (102) and an inward-contracting section (103) from left to right. The inner diameter of the outward-expanding section (101) increases gradually from left to right, the inner diameter of the smooth section (102) is consistent, and the inner diameter of the inward-contracting section (103) decreases gradually from left to right.

7. The Astragalus coffee dual-effect concentration device based on an integrated high-efficiency heat exchange module according to claim 6 is characterized in that: The tube group (9) comprises a connecting disk (91), a straight tube (92) and a curved tube (93); the connecting disk (91) is arranged in a semicircular structure, and a plurality of connecting disks (91) are staggeredly connected on the cavity wall of the primary air cavity (22); the straight tube (92) and the curved tube (93) both vertically penetrate the plurality of connecting disks (91); and the upper ends of the straight tube (92) and the curved tube (93) are both in communication with the secondary air cavity (21); the lower end of the straight tube (92) is in communication with the liquid cavity (23); and the lower end of the curved tube (93) is in communication with the expansion section (101).

8. The Astragalus coffee dual-effect concentration device based on an integrated high-efficiency heat exchange module according to claim 7 is characterized in that: A sensor (12) is installed on the inner upper wall of the first-effect evaporator (2), and the probe of the sensor (12) faces the inner cavity of the straight tube (92). The motor (113) has servo performance.

Images