Refrigeration type drying machine with low cooling water consumption

Abstract

The invention relates to the technical field of drying machine evaporators, and discloses a freezing type drying machine with low cooling water consumption. An air inlet and an air outlet are formed in the two ends of an evaporator shell, a refrigerant pipe is arranged in the evaporator shell, cooling water flows in the refrigerant pipe, the refrigerant pipe horizontally penetrates through the evaporator shell, a baffle plate is arranged in the evaporator shell, and the baffle plate is arranged in the evaporator shell. The baffle plates are horizontally arrayed between the air inlet and the air outlet, notches allowing air to flow through are reserved in the upper ends or the lower ends of the baffle plates, the positions of the notches of the adjacent baffle plates are different, a drainage groove and an evaporator water inlet are formed in the bottom in the evaporator shell, heat conduction plates are arrayed between every two baffle plates, and refrigerant pipes penetrate through the heat conduction plates. Air deflectors are arranged between the heat conduction plates, the air deflectors are arranged on the two sides of each refrigerant pipe, the adjacent rows of refrigerant pipes are arranged in a staggered mode, protrusions are arranged on the sides, facing the air inlet, of the baffle plates in an array mode, the refrigerant pipes penetrate through the centers of the protrusions, and gaps are reserved between the protrusions.

Description

Technical Field

[0001] The present invention relates to the technical field of dryer evaporators, and particularly to a refrigerated dryer with low cooling water consumption. Background Art

[0002] A refrigerated dryer, also known as a freeze dryer or a refrigeration dryer, is a drying device that uses refrigeration technology to reduce the dew point temperature of air. Its working principle is mainly based on the principles of compression refrigeration and air heat exchange. By lowering the temperature of compressed air, the water vapor in it condenses into liquid water, thereby achieving the purpose of removing moisture from the air. Specifically, when compressed air enters the refrigerated dryer, it first passes through a precooler for preliminary cooling, and then enters the evaporator. In the evaporator, the compressed air exchanges heat with the refrigerant, and the temperature is further reduced, causing the water vapor in it to condense into liquid water and be discharged. After that, the dried air is reheated to increase its outlet temperature and avoid dew formation during transportation due to too low temperature. The main components of a refrigerated dryer include a compressor, an evaporator, a condenser, an expansion valve (or throttling device), a precooler, a heater, etc. Among them, the compressor is used to provide the power required for the refrigeration cycle; the evaporator is the place where air exchanges heat with the refrigerant, causing the moisture in the air to condense; the condenser is used to condense the refrigerant from a gaseous state to a liquid state and release heat; the expansion valve or throttling device is used to regulate the flow rate and pressure of the refrigerant; the precooler and the heater are respectively used for preliminary cooling and reheating the dried air. In addition, the refrigerated dryer also has some auxiliary functions, such as an automatic drainage system for discharging the condensed water; a monitoring system that can monitor the operating status of the equipment in real time; and a remote control function that facilitates users to perform remote operation and management. These functions make the refrigerated dryer more stable, reliable, and easy to maintain during operation. In terms of applications, the refrigerated dryer is widely used in occasions where compressed air needs to be dried, such as the pharmaceutical, food, chemical, electronics, textile and other industries. In the pharmaceutical industry, it can be used to prepare stable drug preparations; in the food industry, it can be used to maintain the taste, nutrition and original flavor of food; in the chemical industry, it can be used for the preparation of organic compounds and the control of chemical reactions, etc. In addition, the refrigerated dryer can also be used in biological experiments, medical experiments, as well as in the fields of synthesis of polymer materials, catalyst preparation, nano material preparation, etc.

[0003] In the evaporator of a refrigerated dryer, there is a refrigerant pipe for the refrigerant to pass through. The refrigerant flowing in the refrigerant pipe is cooling water or freon, which is used to exchange heat with the gas in the evaporator. After the wet air enters the evaporator, it contacts the surface of the low-temperature refrigerant pipe or baffle. When the air temperature drops below the dew point temperature, water vapor condenses into water droplets on the surface of the heat exchange device. The water droplets form a water film on the surface of the heat exchange device, increasing the thermal resistance and reducing the heat exchange efficiency. The presence of the water film will hinder the direct contact between the air and the surface of the heat exchange device, reducing the heat exchange area, resulting in an increase in the consumption of cooling water. It is necessary to collect and discharge the condensed water droplets in a timely manner. Summary of the Invention

[0004] (1) Technical problems to be solved: In view of the deficiencies of the prior art, the present invention provides a refrigerated dryer with low cooling water consumption, which has the advantages of quickly collecting and discharging condensed water, and solves the problem that the condensed water adheres to the surface of the heat exchanger and reduces the heat exchange efficiency.

[0005] (2) Technical solutions: To achieve the purpose of quickly collecting and discharging condensed water, the present invention provides the following technical solutions: A refrigerated dryer with low cooling water consumption, including an evaporator housing. There are an air inlet and an air outlet at both ends of the evaporator housing. The air inlet is communicated with a pre-cooler, and the gas to be dried flows from the pre-cooler into the evaporator housing. The air outlet is communicated with a gas-liquid separator. There is a refrigerant pipe in the evaporator housing, and cooling water flows in the refrigerant pipe. The refrigerant pipe horizontally passes through the evaporator housing. There are baffles in the evaporator housing. The baffles are horizontally arranged in an array between the air inlet and the air outlet and are vertically arranged. There is a gap for the gas to flow through at the upper or lower end of the baffle, and the gap positions of adjacent baffles are different. There is a drainage trough and an evaporator water inlet at the bottom of the evaporator housing. The drainage trough is an independent cavity and is communicated with the inside of the evaporator housing through the evaporator water inlet. There is a heat conduction plate arranged in an array between every two baffles, and the refrigerant pipe passes through the heat conduction plate. There are air guiding plates between the heat conduction plates, and there are air guiding plates on both sides of each refrigerant pipe. The adjacent rows of refrigerant pipes are arranged staggeredly. There are protrusions arranged in an array on the side of the baffle facing the air inlet. The refrigerant pipe passes through the center of the protrusion, and there is a gap between each protrusion.

[0006] Preferably, at the area where the air flows downward between two baffles, the bottom evaporator water inlet is provided with a chamfer and is designed to be tapered, and the diameter of the end close to the drainage trough is reduced.

[0007] Preferably, at the area where the air flows upward between two baffles, the evaporator water inlet is arranged as a straight-through notch.

[0008] Preferably, the air guiding plate is arc-shaped and is concentric with the adjacent refrigerant pipe.

[0009] Preferably, the protrusion is frustum-shaped.

[0010] Preferably, the side surface of the protrusion is provided with radially arranged diversion grooves, and the condensed water can flow along the diversion grooves to the surface of the baffle plate.

[0011] Preferably, a baffle plate water inlet is provided at the lower end of the side of the baffle plate facing the air inlet, and the baffle plate water inlet is provided with a chamfer.

[0012] Preferably, a heat insulation plate is provided on the surface of the baffle plate facing the air outlet side.

[0013] (III) Beneficial effects: Compared with the prior art, the present invention provides a refrigerated dryer with low cooling water consumption, having the following beneficial effects: 1. In this refrigerated dryer with low cooling water consumption, through the arrangement of the baffle plate, the gas to be dried forms an up-and-down folding flow in the evaporator housing. This flow pattern enables the gas to exchange heat with the refrigerant pipes more fully. At the same time, the combined use of the heat conducting plate and the air guiding plate further enhances the heat exchange effect. The guiding function of the air guiding plate reduces the resistance in air flow, lowers the thermal resistance, and enables heat to be transferred faster. In addition, the adjacent rows of refrigerant pipes are arranged staggeredly, ensuring the uniformity of gas cooling and improving the overall heat transfer efficiency. The design of the protrusions on the baffle plate not only increases the heat exchange area but also forms a path for collecting condensed water. During the gas flow, the condensed water can be collected and flow along the gaps between the protrusions, improving the flow efficiency of the condensed water and the smoothness of drainage. This helps to reduce the risk of condensed water accumulation on the surface of the baffle plate in the evaporator housing, thus avoiding the problem of reduced heat conduction efficiency caused by condensed water accumulation. The ingenious combination of components such as the baffle plate, the heat conducting plate, and the air guiding plate not only improves the heat exchange efficiency but also enhances the structural stability of the evaporator housing. The stable installation and reasonable layout of these components enable the entire evaporator housing to maintain good stability and durability when bearing gas flow and temperature changes. The design of this structure also takes into account the requirements of easy maintenance and cleaning. The drainage groove is connected to the space inside the evaporator housing through the evaporator water inlet for drainage, and a one-way valve is provided at the outlet end of the drainage groove to prevent external air and moisture from entering the evaporator housing. This design allows for the convenient drainage of accumulated water and impurities in the evaporator housing during maintenance and cleaning, keeping the equipment clean and operating efficiently.

[0014] 2. In the region where the air flows downward between the baffle plates of the refrigerated dryer with low cooling water consumption, the chamfer and tapered design of the bottom evaporator water inlet significantly improve the drainage efficiency of the condensed water. This design enables the condensed water to flow more smoothly along the gap between the baffle plate and the protrusion, and under the action of gravity, it flows towards the drainage trough. The tapered evaporator water inlet not only facilitates the collection of condensed water but also, when the condensed water completely flows into the drainage trough, effectively prevents excessive gas to be dried from mistakenly entering the drainage trough by increasing the resistance of air inflow, thus maintaining the normal operation and efficient heat exchange of the equipment. In the region where the air flows upward, the evaporator water inlet adopts a straight-through notch design. This innovation effectively solves the problem that it is difficult for condensed water to condense and collect in this region. The straight-through notch not only reduces the resistance during gas flow but also utilizes the negative pressure effect formed by air flow to carry out the residual air in the drainage trough, further reducing the amount of gas flowing into the drainage trough. This not only avoids the reduction in output caused by gas loss but also ensures the continuity and stability of gas flow inside the equipment. Combining the above two designs, the gas flow inside the entire evaporator housing becomes more orderly and efficient. The synergistic effect of the baffle plate, heat conduction plate, and air guide plate, as well as the ingenious design of the evaporator water inlet 131, jointly construct a highly efficient and stable heat exchange environment. This not only improves the heat exchange efficiency but also reduces energy loss and cooling water consumption, enabling the equipment to achieve lower operating costs while maintaining high performance.

[0015] 3. The refrigerated dryer with low cooling water consumption effectively utilizes the natural flow trend of condensed water under the action of gravity through the frustum-shaped protrusion and the radial diversion grooves on its side. After the condensed water forms on the surface of the protrusion, it can quickly flow towards the baffle plate along the guidance of the diversion grooves. This design greatly reduces the accumulation of condensed water inside the evaporator housing and ensures the efficient discharge of condensed water. The setting of the heat insulation plate effectively reduces the condensation of water vapor on the side of the baffle plate facing the air outlet. Blocked by the heat insulation plate, the condensed water will not accumulate in large quantities on this side and consume the cold generated by the refrigerant pipe 11. This helps to maintain the low-temperature environment inside the evaporator, ensures the effective cooling effect of the refrigerant pipe, and avoids unnecessary cold loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present invention.

[0017] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the gas flow of the present invention.

[0019] Figure 4 It is a schematic structural diagram of the air guide plate of the present invention.

[0020] Figure 5 Schematic diagram of air flow of the air deflector of the present invention.

[0021] Figure 6 Schematic diagram of the convex structure of the present invention.

[0022] Figure 7 Schematic diagram of air flow of the baffle of the present invention.

[0023] Figure 8 Schematic diagram of the structure of the water inlet of the evaporator of the present invention.

[0024] In the figure: 1. Evaporator housing; 11. Refrigerant pipe; 12. Baffle; 13. Drainage tank; 14. Heat conduction plate; 101. Air inlet; 102. Air outlet; 111. Air deflector; 112. Protrusion; 121. Heat insulation plate; 131. Water inlet of evaporator; 132. Water inlet of baffle; 1121. Flow guide groove. Specific embodiments

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figures 1 - 5 , a freeze dryer with low cooling water consumption, including an evaporator housing 1, an air inlet 101 and an air outlet 102 are provided at both ends of the evaporator housing 1, the air inlet 101 is communicated with a pre-cooler, the gas to be dried flows from the pre-cooler into the evaporator housing 1, the air outlet 102 is communicated with a gas-liquid separator, a refrigerant pipe 11 is provided in the evaporator housing 1, cooling water flows in the refrigerant pipe 11, and the refrigerant pipe 11 horizontally passes through the evaporator housing 1, a baffle 12 is provided in the evaporator housing 1, the baffle 12 is horizontally arranged in an array between the air inlet 101 and the air outlet 102 and is vertically arranged, a gap for the gas to flow through is left at the upper end or the lower end of the baffle 12, and the gap positions of adjacent baffles 12 are different, a drainage tank 13 and a water inlet 131 of the evaporator are provided at the bottom inside the evaporator housing 1, the drainage tank 13 is an independent cavity and is communicated with the inside of the evaporator housing 1 through the water inlet 131 of the evaporator, heat conduction plates 14 are arranged in an array between every two of the baffles 12, and the refrigerant pipe 11 passes through the heat conduction plates 14, air deflectors 111 are provided between the heat conduction plates 14, air deflectors 111 are provided on both sides of each refrigerant pipe 11, and adjacent rows of the refrigerant pipes 11 are arranged staggeredly. Refer to Figures 6 - 7, the baffle 12 is arrayed with protrusions 112 on the side facing the air inlet 101. The refrigerant pipe 11 passes through the center of the protrusion 112, and there is a gap between each protrusion 112.

[0027] The gas to be dried enters the evaporator housing 1 through the air inlet 101. Blocked by the baffle 12, it forms an up-and-down return flow and finally flows out from the air outlet 102 at the other end of the evaporator housing 1. There is low-temperature cooling water flowing in the refrigerant pipe 11, which reduces the temperature of the refrigerant pipe 11. The refrigerant pipe 11 is connected to external equipment, enabling the cooling water to continuously flow in the refrigerant pipe 11. Heat conduction plates 14 are arrayed on the refrigerant pipe 11 between every two baffles 12. Air guide plates 111 are provided on the heat conduction plates 14 and are arranged on both sides of the refrigerant pipe 11. The adjacent rows of the refrigerant pipes 11 are arranged staggeredly. Affected by the air guide plates 111, the air can flow more smoothly over the surface of the refrigerant pipe 11, reducing the generation of turbulence and eddy currents. The gas can flow more evenly over each refrigerant pipe 11, improving the overall heat transfer efficiency. Through the guiding effect of the air guide plates 111, the resistance generated during air flow is reduced, the thermal resistance is lowered, enabling heat to be transferred faster. And because of the staggered arrangement, the gas flowing outside the air guide plates 111 will flow into the space between the refrigerant pipes 11 and the air guide plates 111 in the next row and exchange heat with the refrigerant pipe 11, ensuring the uniformity of gas cooling. The orderly gas flow enables the condensed water generated when the gas cools to adhere to the air guide plates 111 and the refrigerant pipes 11, enabling the condensed water to flow orderly, reducing randomness, and avoiding the eddy currents and turbulence from blowing away the condensed and aggregated water. The baffle 12 is arrayed with protrusions 112 on the side facing the air inlet 101. The refrigerant pipe 11 passes through the center of the protrusion 112, increasing the heat exchange area between the baffle 12 and the refrigerant pipe 11. At the same time, through the setting of the protrusions 112, a path for collecting condensed water is formed between each protrusion 112 on the side of the baffle 12 facing the air inlet 101. Since the gas as a whole flows from the side of the air inlet 101 to the side of the air outlet 102, when the gas is flowing, it will generate an upward or downward flow on the side of the baffle 12 facing the air inlet 101. When the gas flows on the surface of the baffle 12, affected by the narrow gaps between the protrusions 112, the generation of turbulence and eddy currents is reduced. At the same time, during the contact with the baffle 12 and the protrusions 112, the generated condensed water can flow along the gaps between the protrusions 112, improving the flow efficiency and drainage smoothness of the condensed water, helping to reduce the risk of condensed water accumulation on the surface of the baffle 12 in the evaporator housing 1 and lowering the heat conduction efficiency. The drain trough 13 is connected to the space inside the evaporator housing 1 through the evaporator water inlet 131 for draining water, and a one-way valve is provided at the outlet end of the drain trough 13 to prevent external air and moisture from entering the evaporator housing 1.

[0028] In the area where the air between the two baffles 12 flows downward, refer to Figure 8, the bottom evaporator water inlet 131 is provided with a chamfer and is designed as a tapered type. The diameter of the end close to the drain trough 13 decreases. In the area where the air flows downward, since the air flow direction is the same as the direction of gravity of the condensed water, the condensed water in this area can be better concentrated and flow out from the drain trough 13. By providing a chamfer at the evaporator water inlet 131, it is convenient for the collection of condensed water. The tapered design increases the resistance of air inflow when the condensed water completely flows into the drain trough 13, avoiding excessive drying gas from flowing into the drain trough 13 through the evaporator water inlet 131. In the area where the air flows upward between the two baffle plates 12, the evaporator water inlet 131 is provided as a straight-through notch. In the area where the air flows upward, the air flow direction is opposite to the direction of gravity of the condensed water, and it is difficult for the condensed water to condense and collect. By designing the evaporator water inlet 131 as a straight-through notch and affected by the negative pressure formed by the air flow, the air in the drain trough 13 is taken out, reducing the amount of gas flowing into the drain trough 13 and avoiding a reduction in output.

[0029] The air guide plate 111 is in an arc shape and is concentrically arranged with the adjacent refrigerant pipe 11. The arc-shaped air guide plate 111 can guide the air flow more smoothly, reducing the turbulence and eddy current of the air flow around the refrigerant pipe 11. This design makes the air flow more evenly distributed around each refrigerant pipe 11, improving the uniformity and efficiency of heat exchange. At the same time, the concentric arrangement further ensures that the effective contact area between the air flow and the refrigerant pipe 11 is maximized, thereby enhancing the heat transfer effect. The design of the arc-shaped air guide plate 111 also helps to enhance the condensation effect. When the air flow passes through the refrigerant pipe 11, due to the guidance of the air guide plate, the water vapor in the air flow is more likely to condense into water droplets on the surface of the refrigerant pipe. The concentric arrangement enables the condensed water droplets to slide more smoothly along the surface of the refrigerant pipe, reducing the accumulation of condensed water droplets on the air guide plate or the refrigerant pipe, thereby improving the discharge efficiency of the condensed water. By optimizing the air flow distribution and enhancing the condensation effect, the design of the arc-shaped air guide plate 111 helps to reduce energy loss. The uniform air flow distribution and effective heat transfer can ensure that the cooling water in the refrigerant pipe can more fully absorb the heat in the air flow, thereby reducing the temperature and consumption of the cooling water. At the same time, reducing the accumulation of condensed water droplets can also avoid unnecessary energy loss and improve the energy efficiency of the entire system.

[0030] The protrusion 112 is in a frustum shape, and the side surface of the protrusion 112 is provided with radially arranged diversion grooves 1121. The condensed water can flow along the diversion grooves 1121 to the surface of the baffle plate 12. The lower end of the baffle plate 12 facing the air inlet 101 is provided with a baffle plate water inlet 132, and the baffle plate water inlet 132 is provided with a chamfer.

[0031] The surface of the baffle 12 facing the air outlet 102 is provided with a heat insulation plate 121. The side of the baffle 12 facing the air outlet 102 has less contact with the airflow. The setting of the heat insulation plate 121 reduces the condensation of water vapor on this side, and prevents the condensed water from adhering here but being unable to be collected and discharged, thereby consuming the cooling capacity brought by the refrigerant pipe 11 and reducing the heat transfer efficiency.

[0032] Working principle: The gas to be dried enters the evaporator shell 1 through the air inlet 101, and is blocked by the baffle 12 to form an up and down return flow, and finally flows out from the air outlet 102 at the other end of the evaporator shell 1. Low-temperature cooling water flows in the refrigerant tube 11 to reduce the temperature of the refrigerant tube 11. The refrigerant tube 11 is connected to the external equipment to allow the cooling water to continuously flow in the refrigerant tube 11. A heat conduction plate 14 is arranged on the refrigerant tube 11 between every two baffles 12. An air guide plate 111 is provided on the heat conduction plate 14 and is arranged on both sides of the refrigerant tube 11. The adjacent rows of refrigerant tubes 11 are staggered, and the air flow is affected by the air guide plate 111, so that it can flow more smoothly. The surface of the refrigerant tube 11 is passed through, which reduces the generation of turbulence and eddy currents, and the gas can flow through each refrigerant tube 11 more evenly, thereby improving the overall heat transfer efficiency. The guiding effect of the air guide plate 111 reduces the resistance generated in the air flow, reduces the thermal resistance, and makes the heat transfer faster. Moreover, due to the staggered arrangement, the gas flowing through the outside of the air guide plate 111 will flow into the refrigerant tube 11 of the next row and the air guide plate 111 directly, and perform heat exchange with the refrigerant tube 11, thereby ensuring the uniformity of gas cooling and orderly gas flow. When the gas is cooled, the condensation with water vapor can be attached to the air guide plate 111 and the refrigerant tube 11, so that the condensed water can be Orderly flow reduces randomness and avoids eddy currents and turbulence that blow away the condensed water. An array of protrusions 112 is provided on the side of the baffle 12 facing the air inlet 101. The refrigerant tube 11 passes through the center of the protrusion 112, so that the heat exchange area between the baffle 12 and the refrigerant tube 11 is increased. At the same time, through the setting of the protrusion 112, a path for collecting condensed water is formed between each protrusion 112 on the side facing the air inlet 101 of the baffle 12. Because the gas as a whole flows from the side of the air inlet 101 to the side of the air outlet 102, the gas will generate upward or downward movement on the side of the baffle 12 facing the air inlet 101 during the flow process. When the gas flows on the surface of the baffle 12, it is affected by the narrow gap between the protrusions 112, which reduces the generation of turbulence and eddy currents. At the same time, in the process of contact with the baffle 12 and the protrusion 112, the condensed water generated can flow along the gap between the protrusions 112, thereby improving the flow efficiency and drainage smoothness of the condensed water, helping to reduce the risk of condensed water accumulation on the surface of the baffle 12 in the evaporator shell 1 and reducing the thermal conductivity. The drainage groove 13 is connected to the space inside the evaporator shell 1 through the evaporator water inlet 131 for drainage, and a one-way valve is provided at the outlet end of the drainage groove 13 to prevent external air and moisture from entering the evaporator shell 1.

[0033] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A refrigerated dryer with low cooling water consumption, comprising an evaporator housing (1). An air inlet (101) and an air outlet (102) are provided at both ends of the evaporator housing (1). A refrigerant pipe (11) is arranged in the evaporator housing (1). Cooling water flows in the refrigerant pipe (11), and the refrigerant pipe (11) horizontally passes through the evaporator housing (1), characterized in that: A baffle plate (12) is provided inside the evaporator housing (1). The baffle plates (12) are horizontally arrayed and vertically arranged between the air inlet (101) and the air outlet (102). A notch for gas to flow through is left at the upper or lower end of the baffle plate (12), and the notch positions of adjacent baffle plates (12) are different. A drain tank (13) and an evaporator water inlet (131) are provided at the inner bottom of the evaporator housing (1). The drain tank (13) is an independent cavity and is communicated with the inside of the evaporator housing (1) through the evaporator water inlet (131). Heat conduction plates (14) are arrayed between every two baffle plates (12), and the refrigerant pipes (11) pass through the heat conduction plates (14). Air guide plates (111) are provided between the heat conduction plates (14), and air guide plates (111) are provided on both sides of each refrigerant pipe (11), and the air guide plates (111) are semi-circular. The adjacent rows of the refrigerant pipes (11) are arranged staggeredly. Protrusions (112) are arrayed on the side of the baffle plate (12) facing the air inlet (101), and the refrigerant pipes (11) pass through the centers of the protrusions (112).

2. The freeze dryer with low cooling water consumption according to claim 1, wherein: In the area where the air flows downward between the two baffle plates (12), the bottom evaporator water inlet (131) is provided with a chamfer and is of a tapered design, and the diameter decreases at the end close to the drain tank (13).

3. The freeze dryer with low cooling water consumption according to claim 2, wherein: In the area where the air flows upward between the two baffle plates (12), the evaporator water inlet (131) is provided as a straight-through notch.

4. A refrigerated dryer with low cooling water consumption according to claim 1, characterized in that: The air guide plate (111) is arc-shaped and is concentric with the adjacent refrigerant pipe (11).

5. A refrigerated dryer with low cooling water consumption according to claim 1, characterized in that: The protrusion (112) is frustum-shaped.

6. A refrigerated dryer with low cooling water consumption according to claim 5, characterized in that: The side surface of the protrusion (112) is provided with radially arranged diversion grooves (1121), and condensed water can flow along the diversion grooves (1121) to the surface of the baffle plate (12).

7. A refrigerated dryer with low cooling water consumption according to claim 5, characterized in that: A baffle plate water inlet (132) is provided at the lower end of the side of the baffle plate (12) facing the air inlet (101), and the baffle plate water inlet (132) is provided with a chamfer.

8. A refrigerated dryer with low cooling water consumption according to any one of claims 1-7, characterized in that: A heat insulation plate (121) is provided on the surface of the side of the baffle plate (12) facing the air outlet (102).

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