Evaporative degreasing refrigeration dryer

Abstract

The utility model provides an evaporative grease removal refrigeration dryer which comprises a plurality of evaporators, each evaporator comprises a shell and a heat exchange device arranged in the shell, and each heat exchange device comprises a plurality of transversely-arranged evaporation pipes and a plurality of guide plates which are arranged on the outer sides of the evaporation pipes in a sleeving mode and are sequentially and transversely distributed at intervals. The adjacent guide plates oppositely extend up and down to form a discharging gap with the inner wall of the shell, and an air inlet pipeline, an air outlet pipeline, a hot air pipeline and a discharging pipeline are arranged on the side wall of the shell; the auxiliary discharging structure is arranged in the shell and used for assisting materials between the guide plates extending downwards to be discharged to the discharging pipeline; and the refrigerant system is used for inputting a refrigerant to the plurality of evaporation pipes. Through the additional arrangement of the hot air pipeline, grease and frost accumulated on the surface of the evaporation pipe are melted and removed, decontamination treatment is achieved, and on the basis, the auxiliary discharging structure assists materials between the guide plates on the lower side to be discharged to the discharging pipeline, so that the discharging efficiency of liquid materials is improved.

Description

Technical Field

[0001] This utility model relates to the field of refrigerated dryers, specifically an evaporative degreasing refrigerated dryer. Background Technology

[0002] For processes such as bio-based fatty acid processing, the high-temperature industrial exhaust gas produced contains vaporized lipids, such as peanut oil and soybean oil. Therefore, the exhaust gas needs to be treated by first removing and drying the oils in a refrigerated dryer before being fed into subsequent equipment. This is to prevent the lipids in the exhaust gas from solidifying and clogging the filter elements of the subsequent equipment, which would lead to blockage and damage.

[0003] A refrigerated dryer, short for freeze dryer, consists of an evaporator that uses refrigerant-filled evaporator tubes to exchange heat with the exhaust gas. This lowers the exhaust gas temperature to the dew point of the grease it contains, causing the grease to solidify and separate, and the water vapor to condense and be retained within the evaporator. The dried gas is then output, achieving degreasing and freeze-drying of the exhaust gas. However, after prolonged use, especially when the refrigerant temperature remains below 0°C for extended periods, grease and frost accumulate on the evaporator tubes, reducing the contact area between the exhaust gas and the tubes. This severely impacts the evaporator's degreasing and freeze-drying efficiency, requiring the entire dryer to be shut down for cleaning. This necessitates the refrigerant system to be re-prepared and fed back into the evaporator, significantly reducing exhaust gas treatment efficiency.

[0004] The research objective of this utility model is to design an evaporative degreasing refrigerated dryer to address the problems existing in the prior art. Utility Model Content

[0005] In view of the problems existing in the prior art, the present invention provides an evaporative degreasing refrigerated dryer, which can effectively solve the problems existing in the prior art.

[0006] The technical solution of this utility model is:

[0007] An evaporative degreasing refrigerated dryer includes:

[0008] A plurality of evaporators, each of the evaporators including a shell and a heat exchange device disposed within the shell, the heat exchange device including a plurality of horizontally arranged evaporation tubes and a plurality of guide plates sleeved on the outside of the plurality of evaporation tubes and arranged horizontally at intervals in sequence, the adjacent guide plates extending vertically in opposite directions to form a discharge gap with the inner wall of the shell, the side wall of the shell being provided with an inlet pipe and an outlet pipe respectively corresponding to the two ends of the plurality of evaporation tubes, as well as a hot gas pipe for inputting hot gas into the shell and a discharge pipe corresponding to the outlet pipe located below the outlet pipe;

[0009] An auxiliary discharge structure is provided inside the housing and is used to assist the discharge of material between the downwardly extending guide plates into the discharge pipeline;

[0010] The refrigerant system has an inlet and an outlet connected to the inlet and outlet of several evaporator tubes, respectively, and is used to input refrigerant into the several evaporator tubes.

[0011] Furthermore, there are two evaporators, the inner cavity of the shell extends laterally, the inlet pipe and outlet pipe are located at the front and rear ends of the top of the shell respectively, the discharge pipe is located at the rear end of the bottom of the shell, a number of evaporator tubes are arranged side by side and each evaporator tube is arranged to bend back and forth in an S-shape from top to bottom, and the heat exchange device also includes a number of fins arranged vertically and sequentially spaced laterally on the outside of the number of evaporator tubes, and a vertically extending condensation zone is formed between adjacent fins.

[0012] Furthermore, several discharge zones are formed sequentially in the transverse direction between the downwardly extending guide plates. The auxiliary discharge structure includes several parallel material extraction pipes that are attached to the bottom of the housing and extend laterally. The inner and outer walls of the material extraction pipes are smooth. One end of each material extraction pipe is sealed and passes through the corresponding guide plate to the several discharge zones, and the other end is connected to the suction device.

[0013] Furthermore, the number of guide plates is five, with the first guide plate extending downwards. A primary discharge zone is formed between the first and third guide plates, and a secondary discharge zone is formed between the third and fifth guide plates. The plurality of extraction pipes include a primary pipe and a secondary pipe with their front ends located within the primary and secondary discharge zones, respectively. The suction device includes a suction cylinder connecting the other ends of the two extraction pipes and located within the discharge pipeline, a driving device sealed within the suction cylinder, and a piston driven by the driving device to move up and down within the suction cylinder. The piston divides the suction cylinder into a vertically distributed suction zone and a discharge zone. A discharge hole communicating with the discharge zone is provided through the side wall of the suction cylinder. A plurality of discharge holes, each opened and closed by a one-way valve, are provided through the piston. When the piston moves upwards, the plurality of one-way valves open the plurality of discharge holes to connect the suction zone and the discharge zone; when the piston moves downwards, the plurality of one-way valves close the plurality of discharge holes.

[0014] Furthermore, the lower end of the discharge hole expands outward to form a sealing area. The one-way valve includes a sealing ring fixed in the sealing area and a one-way valve plate rotatably connected to the sealing ring on one side. The one-way valve plate is used to swing downward to disengage from the sealing ring after being pressed to open the lower end of the discharge hole, or to swing upward to fit against the sealing ring to close the lower end of the discharge hole.

[0015] Furthermore, the front ends of the primary tube and the secondary tube are located at the rear ends of the primary discharge area and the secondary discharge area, respectively. The bottom of the housing is inclined and protrudes to form a guide surface corresponding to the primary discharge area and being higher in the front and lower in the back. The rear end of the guide surface corresponds to the front end of the primary tube.

[0016] Furthermore, a flow sensor is provided inside the discharge port, which is used to detect the flow rate of the liquid material flowing through the discharge port.

[0017] Furthermore, the housing is provided with several baffles that are laterally spaced at the lower end of the air outlet pipe, and the baffles are spaced apart vertically and each has several through holes.

[0018] Furthermore, the refrigerant system includes a gas-liquid separator, a refrigeration compressor, a condenser, and a refrigerant filter connected in sequence. The discharge end of the refrigerant filter is connected to the inlet end of several evaporator tubes through an expansion valve. The inlet end of the gas-liquid separator is connected to the discharge end of several evaporator tubes. The discharge end of the refrigeration compressor is connected to the discharge end of several evaporator tubes through a bypass solenoid valve.

[0019] Therefore, the beneficial effects of this utility model are:

[0020] 1. By adding a hot gas pipeline, when grease and frost accumulate inside the shell after a certain period of evaporator operation, the inlet, outlet, and discharge pipelines can be closed. Hot gas is then introduced into the shell through the hot gas pipeline for a certain period to melt the solidified grease and frost into a liquid material including liquid oil and liquid water. Subsequently, the discharge pipeline is opened, allowing the liquid grease and water to move sequentially through the discharge gaps and be discharged, thereby removing the grease and frost accumulated on the surface of the evaporator tubes, achieving cleaning, and ensuring the contact area between the exhaust gas and the evaporator tubes after entering the shell, thus ensuring the evaporator's degreasing and freeze-drying effects on the exhaust gas. Simultaneously, several guide plates guide the flow of exhaust gas within the shell, causing it to flow in an S-shape through several evaporator tubes, increasing the contact area between the exhaust gas and the evaporator tubes and improving the condensation effect. Furthermore, an auxiliary discharge structure assists in discharging the material between the lower guide plates into the discharge pipeline, improving the discharge efficiency of liquid material between the downward-extending guide plates. Furthermore, by setting the number of evaporators to a certain number, when one evaporator is being cleaned, the remaining evaporators can still perform degreasing and freeze-drying of the exhaust gas normally. This solves the problem that the refrigerant system needs to be shut down due to the cleaning of the evaporators, i.e., the entire refrigerated dryer has to be shut down. This ensures the continuity of refrigerant circulation and thus ensures the efficiency of exhaust gas treatment.

[0021] 2. Based on the fact that liquid materials in several discharge zones can move sequentially through the discharge gaps toward the discharge pipeline, suction ends are formed at one end of several suction pipes located in several discharge zones to assist in the rapid suction of liquid materials in several discharge zones to the discharge pipeline for discharge, thereby improving the discharge efficiency of several discharge zones to the point where the liquid level is lower than that of several evaporation pipes.

[0022] 3. By adding discharge holes and one-way valves to the piston, when the piston moves upward, several one-way valves open several discharge holes to connect the suction zone and the discharge zone. This allows the liquid material drawn into the suction zone to be squeezed into the discharge zone through the discharge holes. When the piston moves downward, several one-way valves close several discharge holes. The liquid material in the primary tube and diode is drawn into the suction zone, and the liquid material in the discharge zone is squeezed by the piston and discharged into the discharge pipeline through the discharge hole. This achieves the effect of continuously drawing and squeezing out liquid material through the reciprocating motion of the piston, improving the discharge efficiency of the auxiliary discharge structure for liquid material.

[0023] 4. By adding a discharge surface, the speed at which liquid material in the primary discharge zone flows and converges towards the primary pipe and discharge gap is increased, thereby improving the suction efficiency of the primary pipe and the discharge efficiency of liquid material in the primary discharge zone. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an evaporative degreasing and refrigerated dryer.

[0025] Figure 2 This is a cross-sectional view of the evaporator.

[0026] Figure 3 A partial cross-sectional structural diagram to aid in the material arrangement structure.

[0027] Figure 4 This is a schematic diagram of the auxiliary material discharge structure.

[0028] Figure 5 This is a schematic diagram of the piston structure.

[0029] Figure 6 This is a schematic diagram of the piston from another perspective.

[0030] Figure 7 This is a cross-sectional view of the piston.

[0031] Figure 8 This is a partial structural diagram of a heat exchange device. Detailed Implementation

[0032] To facilitate understanding by those skilled in the art, the structure of this utility model will now be described in further detail with reference to the accompanying drawings:

[0033] refer to Figure 1-8 An evaporative degreasing refrigerated dryer, comprising:

[0034] A plurality of evaporators 1, each of the evaporators 1 including a shell 11 and a heat exchange device disposed within the shell 11. The heat exchange device includes a plurality of horizontally arranged evaporation tubes 12 and a plurality of guide plates 14 sleeved on the outside of the plurality of evaporation tubes 12 and arranged horizontally at intervals. Adjacent guide plates 14 extend vertically in opposite directions to form a discharge gap with the inner wall of the shell 11. The side wall of the shell 11 is provided with an inlet pipe 15 and an outlet pipe 16 corresponding to the two ends of the plurality of evaporation tubes 12, as well as a hot gas pipe for inputting hot gas into the shell 11 and a discharge pipe 17 located below the outlet pipe 16. Specifically, the inlet pipe 15 is used to introduce exhaust gas into the shell 11, and the hot gas input into the hot gas pipe is steam, thereby increasing the flow rate of the solidified grease in the shell 11 after melting into liquid. The evaporation tubes 12 are copper tubes, and the fins 13 are aluminum fins, both of which have strong thermal conductivity.

[0035] The heat exchange device also includes several vertically arranged fins 13 that are sequentially and laterally spaced on the outside of several evaporator tubes 12. A vertically extending condensation zone is formed between adjacent fins 13. The flow of exhaust gas in the shell 11 is guided by several guide plates 14, so that the exhaust gas flows back and forth in an S-shape through several evaporator tubes 12. The condensation treatment area of ​​the evaporator tubes 12 is increased by several fins 13, which together increase the contact area between the exhaust gas and the evaporator tubes 12 to improve the condensation effect.

[0036] Auxiliary discharge structure 2 is disposed inside the housing 11 and is used to assist the discharge of material between the downwardly extending guide plates 14 to the discharge pipe 17;

[0037] The refrigerant system has an inlet and an outlet connected to the inlet and outlet of several evaporator tubes 12, respectively, and is used to input refrigerant into the several evaporator tubes 12.

[0038] By adding a hot air pipeline, when grease and frost accumulate inside the shell 11 due to the operation of the evaporator 1 for a certain period of time, the inlet pipeline 15, outlet pipeline 16, and discharge pipeline 17 can be closed. Hot air can then be introduced into the shell 11 through the hot air pipeline for a certain period of time to melt the grease and frost solidified inside the shell 11 into liquid oil and liquid water. Subsequently, the discharge pipeline 17 is opened, allowing the liquid grease and water to move sequentially through the discharge gap towards the discharge pipeline 17 and be discharged. This removes the grease and frost accumulated on the surface of the evaporator tube 12, achieving cleaning treatment and ensuring the contact area between the exhaust gas and the evaporator tube 12 after the exhaust gas enters the shell 11, thus ensuring the grease removal and freeze-drying effect of the evaporator 1 on the exhaust gas. Simultaneously, the flow of exhaust gas within the casing 11 is guided by several guide plates 14, causing the exhaust gas to flow in an S-shape through several evaporator tubes 12. This increases the contact area between the exhaust gas and the evaporator tubes 12, thereby improving the condensation effect. Furthermore, an auxiliary discharge structure 2 assists in discharging the material between the lower guide plates 14 into the discharge pipe 17, improving the discharge efficiency of liquid material between the downward-extending guide plates 14. Moreover, by setting the number of evaporators 1 to several, when one evaporator 1 is undergoing cleaning, the remaining evaporators 1 can still normally perform degreasing and freeze-drying treatment on the exhaust gas. This solves the problem that the refrigerant system needs to be shut down due to the cleaning of the evaporator 1, meaning the entire refrigerated dryer must be shut down. This ensures the continuity of refrigerant circulation and thus ensures the efficiency of exhaust gas treatment.

[0039] Specifically, there are two evaporators 1, the inner cavity of the housing 11 extends laterally, the air inlet pipe 15 and the air outlet pipe 16 are located at the front and rear ends of the top of the housing 11 respectively, the discharge pipe 17 is located at the rear end of the bottom of the housing 11, and several evaporation tubes 12 are arranged side by side and each evaporation tube 12 is arranged to bend back and forth in an S-shape from top to bottom.

[0040] To improve the discharge efficiency of liquid oil and water between the downwardly extending guide plates 14, several discharge zones are sequentially formed between the downwardly extending guide plates 14 in a transverse direction. The auxiliary discharge structure 2 includes several parallel suction pipes 21 that are attached to the bottom of the housing 11 and extend laterally. The inner and outer walls of the suction pipes 21 are smooth surfaces. Specifically, the inner and outer walls of the suction pipes 21 can be polished to form smooth surfaces to reduce friction and thereby increase the flow speed of liquid oil on their inner and outer walls. One end of each suction pipe 21 is sealed and passes through the corresponding guide plate 14 to the several discharge zones, and the other end is connected to a suction device 22. Specifically, the suction device 22 can be a vacuum structure such as a water pump. Based on the fact that the liquid material in the several discharge zones can move sequentially through the discharge gaps toward the discharge pipe 17, the liquid material in the several discharge zones is quickly drawn into the discharge pipe 17 by forming suction ends at one end of several suction pipes 21, which are located in the several discharge zones respectively, thereby improving the discharge efficiency of the several discharge zones until the liquid level is lower than that of the several evaporation pipes 12.

[0041] To improve the discharge efficiency of the auxiliary discharge structure 2, there are five guide plates 14, with the first guide plate 14 extending downwards. A primary discharge zone 3 is formed between the first and third guide plates 14, and a secondary discharge zone 4 is formed between the third and fifth guide plates 14. Several extraction pipes 21 include a primary pipe 211 and a secondary pipe 212, with their front ends located within the primary discharge zone 3 and the secondary discharge zone 4, respectively. Specifically, one primary pipe 211 is provided and coaxially located on the bottom center side of the housing 11. The secondary tube 212 has two sections, respectively located on the left and right sides of the primary tube 211. The suction device 22 includes a suction cylinder 221 connected to the other ends of the two suction tubes 21 and located within the discharge pipe 17, a driving device 222 sealed within the suction cylinder 221, and a piston 223 driven by the driving device 222 to move up and down within the suction cylinder 221. The piston 223 divides the suction cylinder 221 into a vertically distributed suction area 2211 and a discharge area 2212. The side wall of the suction cylinder 221 is provided with a through-hole connection to the discharge area 221. The piston 223 has a discharge port 2213, and a plurality of discharge ports 2231, each controlled by a one-way valve, are provided through it. Specifically, the drive device 222 can be a motor that controls the rotation of a crank rocker arm. One end of the crank rocker arm is hinged to a telescopic rod, and the other end of the telescopic rod is hinged to the bottom of the piston 223. Thus, by adding the discharge ports 2231 and the one-way valves on the piston 223, when the piston 223 moves upward, the plurality of one-way valves open the plurality of discharge ports 2231 to connect the suction zone 2211 and the discharge zone 2212, so that the material is drawn into the discharge zone. Liquid material in suction zone 2211 is squeezed into discharge zone 2212 through discharge hole 2231. When piston 223 moves downward, several one-way valves close several discharge holes 2231. Liquid material in primary tube 211 and diode is sucked into suction zone 2211. Liquid material in discharge zone 2212 is squeezed by piston 223 and discharged through discharge hole 2213 into discharge pipe 17. This achieves the effect of continuously sucking and squeezing liquid material downward through reciprocating piston 223, improving the discharge efficiency of auxiliary discharge structure 2 for liquid material.

[0042] To improve the speed of opening and closing of the one-way valve and thus the smoothness of the reciprocating motion of the piston 223, the lower end of the discharge hole 2231 is expanded to form a sealing area. The one-way valve includes a sealing ring 2232 fixed in the sealing area and a one-way valve plate 2233 rotatably connected to the sealing ring 2232 on one side. The one-way valve plate 2233 is used to swing downward to disengage from the sealing ring 2232 after being pressed to open the lower end of the discharge hole 2231, or to swing upward to fit against the sealing ring 2232 to close the lower end of the discharge hole 2231.

[0043] Because the exhaust gas enters through the intake pipe 15 at the top front of the housing 11 and flows through the inner cavity of the housing 11 in an S-shaped undulating manner, the amount of grease and frost accumulated in the primary discharge zone 3 is greater than that in the secondary discharge zone 4. Therefore, in order to further improve the discharge efficiency of liquid materials in the primary discharge zone 3, the front ends of the primary pipe 211 and the secondary pipe 212 are located at the rear ends of the primary discharge zone 3 and the secondary discharge zone 4, respectively. The bottom of the housing 11 is inclined and protrudes to form a guide surface 18 corresponding to the primary discharge zone 3, which is higher at the front and lower at the back. The rear end of the guide surface 18 corresponds to the front end of the primary pipe 211. Thus, by adding the discharge surface, the speed at which liquid materials in the primary discharge zone 3 flow and converge towards the primary pipe 211 and the discharge gap is increased, thereby improving the suction efficiency of the primary pipe 211 and the discharge efficiency of liquid materials in the primary discharge zone 3.

[0044] The refrigerated dryer is also equipped with a complete control system. The inlet pipe 15, outlet pipe 16, and discharge pipe 17 are all equipped with corresponding opening and closing valves. To ensure the control system can accurately control the drive unit 222 to stop working, a flow sensor is installed in the discharge port 2231. The flow sensor detects the flow rate of the liquid material flowing through the discharge port 2231 and feeds it back to the control system. Thus, after the drive unit 222 drives the piston 223 to reciprocate for a certain period of time to draw liquid material from several discharge zones and discharge it into the discharge pipe 17, when the flow sensor detects that the flow rate of the liquid material flowing through the discharge port 2231 has decreased to near zero, the control system controls the drive unit 222 to stop drawing liquid and closes the discharge pipe 17. This completes the cleaning process inside the evaporator 1.

[0045] To further remove grease and moisture carried in the exhaust gas, the housing 11 is provided with several baffles 19 horizontally spaced at the lower end of the exhaust pipe 16. These baffles 19 are spaced vertically and each has several through holes. Thus, the filtration effect of the baffles 19 further removes grease and moisture carried in the exhaust gas.

[0046] Specifically, the refrigerant system includes a gas-liquid separator 5, a refrigeration compressor 6, a condenser 7, and a refrigerant filter connected in sequence. The outlet of the refrigerant filter is connected to the inlet of several evaporator tubes 12 via an expansion valve. The inlet of the gas-liquid separator 5 is connected to the outlet of several evaporator tubes 12. The outlet of the refrigeration compressor 6 is connected to the outlet of several evaporator tubes 12 via a bypass solenoid valve 8. The specific structures of the gas-liquid separator 5, the refrigeration compressor 6, the condenser 7, and the refrigerant filter are existing technologies and not the main inventive point of this application, and will not be described in detail here. This allows the refrigerant to continuously circulate in different forms among the several evaporator tubes 12, the gas-liquid separator 5, the refrigeration compressor 6, the condenser 7, and the refrigerant filter, ensuring that the temperature input into the several evaporator tubes 12 meets the set value and that the refrigerant is in a liquid state.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. 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. An evaporative grease-removing cold dryer characterized by, include: A plurality of evaporators (1), each of the evaporators (1) includes a shell (11) and a heat exchange device disposed within the shell (11). The heat exchange device includes a plurality of horizontally arranged evaporation tubes (12) and a plurality of guide plates (14) sleeved on the outside of the plurality of evaporation tubes (12) and arranged horizontally at intervals. Adjacent guide plates (14) extend vertically in opposite directions to form a discharge gap with the inner wall of the shell (11). The side wall of the shell (11) is provided with an inlet pipe (15) and an outlet pipe (16) corresponding to the two ends of the plurality of evaporation tubes (12), as well as a hot gas pipe for inputting hot gas into the shell (11) and a discharge pipe (17) corresponding to the outlet pipe (16) below the outlet pipe (16). An auxiliary discharge structure (2) is provided inside the housing (11) and is used to assist the material between the downwardly extending guide plates (14) in being discharged to the discharge pipeline (17). The refrigerant system has an inlet and an outlet connected to the inlet and outlet of several evaporation tubes (12), respectively. The refrigerant system is used to input refrigerant into several evaporation tubes (12).

2. An evaporative grease removal cold dryer as claimed in claim 1, wherein, The number of evaporators (1) is two. The inner cavity of the shell (11) extends laterally. The air inlet pipe (15) and the air outlet pipe (16) are located at the front and rear ends of the top of the shell (11), respectively. The discharge pipe (17) is located at the rear end of the bottom of the shell (11). Several evaporation tubes (12) are arranged side by side and each evaporation tube (12) is arranged in an S-shape from top to bottom. The heat exchange device also includes several fins (13) arranged vertically and sequentially spaced laterally on the outside of several evaporation tubes (12). A vertically extending condensation zone is formed between adjacent fins (13).

3. The evaporative grease removal cold dryer as claimed in claim 1, wherein, The guide plates (14) extending downwards form several discharge zones in a horizontal sequence. The auxiliary discharge structure (2) includes several parallel suction pipes (21) attached to the bottom of the housing (11) and extending horizontally. The inner and outer walls of the suction pipes (21) are smooth. One end of each suction pipe (21) is sealed and passes through the corresponding guide plate (14) to the discharge zone, and the other end is connected to the suction device (22).

4. An evaporative grease removal cold dryer as claimed in claim 3, wherein, The number of guide plates (14) is five, with the first guide plate (14) extending downwards. A primary discharge zone (3) is formed between the first guide plate (14) and the third guide plate (14), and a secondary discharge zone (4) is formed between the third guide plate (14) and the fifth guide plate (14). A plurality of extraction pipes (21) include a primary pipe (211) and a secondary pipe (212) with their front ends located within the primary discharge zone (3) and the secondary discharge zone (4), respectively. The suction device (22) includes a suction cylinder (221) connecting the other ends of the two extraction pipes (21) and located within the discharge pipeline (17), a driving device (222) sealed within the suction cylinder (221), and a device controlled by the driving device (222). 2) Drive the piston (223) to move up and down inside the suction cylinder (221). The piston (223) divides the suction cylinder (221) into a suction area (2211) and a discharge area (2212) distributed vertically. The side wall of the suction cylinder (221) is provided with a discharge hole (2213) that communicates with the discharge area (2212). The piston (223) is provided with a plurality of discharge holes (2231) that are opened and closed by one-way valves. When the piston (223) moves upward, the plurality of one-way valves open the plurality of discharge holes (2231) to connect the suction area (2211) and the discharge area (2212). When the piston (223) moves downward, the plurality of one-way valves close the plurality of discharge holes (2231).

5. An evaporative grease removal cold dryer as claimed in claim 4, wherein, The lower end of the discharge hole (2231) expands outward to form a sealing area. The one-way valve includes a sealing ring (2232) that is sealed and fixed in the sealing area, and a one-way valve plate (2233) that is rotatably connected to the sealing ring (2232) on one side. The one-way valve plate (2233) is used to swing downward to disengage from the sealing ring (2232) after being pressed to open the lower end of the discharge hole (2231), or swing upward to fit against the sealing ring (2232) to close the lower end of the discharge hole (2231).

6. An evaporative grease removal cold dryer as claimed in claim 4, wherein, The front ends of the primary tube (211) and the secondary tube (212) are located at the rear ends of the primary discharge area (3) and the secondary discharge area (4), respectively. The bottom of the housing (11) is inclined and protruded to form a guide surface (18) corresponding to the primary discharge area (3) and with the front higher than the rear. The rear end of the guide surface (18) corresponds to the front end of the primary tube (211).

7. An evaporative grease removal cold dryer as claimed in claim 4, wherein, A flow sensor is provided inside the discharge hole (2231), and the flow sensor is used to detect the flow rate of the liquid material flowing through the discharge hole (2231).

8. An evaporative grease removal cold dryer as claimed in claim 1, wherein, The housing (11) is provided with several baffles (19) that are horizontally spaced at the lower end of the air outlet pipe (16). The baffles (19) are distributed vertically at intervals and each has several through holes.

9. An evaporative grease removal cold dryer as claimed in claim 1, wherein, The refrigerant system comprises a gas-liquid separator (5), a refrigeration compressor (6), a condenser (7) and a refrigerant filter connected in sequence, the discharge end of the refrigerant filter is connected with the feed end of a plurality of the evaporation pipes (12) through an expansion valve, the feed end of the gas-liquid separator (5) is connected with the discharge end of a plurality of the evaporation pipes (12), and the discharge end of the refrigeration compressor (6) is connected with the discharge end of a plurality of the evaporation pipes (12) through a bypass electromagnetic valve (8).

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