A cold dryer condensate water drainage anti-blocking system

Abstract

The application discloses a kind of cold dryer condensate drainage anti-blocking systems, drainage device is arranged at the bottom end of filter separator, the bottom end of filter separator is set to the sharp edge shape of higher middle than both sides, drainage port is set at the top of sharp edge shape;Two sewage storage cavities are formed in the both sides of sharp edge shape respectively, and the bottom end of sewage storage cavity is provided with blow-off port;The top end of sewage storage cavity is not higher than the top sealing plate with opening at the place of drainage port, the top sealing plate is gradually set lower from outer end to opening, and piston head is vertically movable and installed above the opening position of top sealing plate, and piston head opens or closes the opening of top sealing plate according to the buoyancy of condensate water.To solve the problem of compressed air loss caused by sewage or drainage process, a piston head is added in the filter separator, a top sealing plate is installed at the top end of sewage storage cavity and opened, the piston head is matched with the opening, the opening and closing of piston head are determined according to the buoyancy of condensate water, and through this self-locking mechanism, compressed air loss is avoided at all times.

Description

Technical Field

[0001] The present invention relates to the technical field of cold dryers, and more particularly to a condensate water drainage and anti-blocking system for cold dryers. Background Art

[0002] When the cold dryer dries the humid air, it will produce condensed water, which is usually produced at the bottom of the air-water separator. However, this condensed water is usually not pure condensed water, and it also contains a certain amount of metal debris, debris particles, etc. Moreover, in order to purify the discharged air, an additional filter is added to the air-water separator. Part of the impurities intercepted by the filter are retained in the filter element and cleaned regularly, and the other part is discharged from the drain outlet with the condensed water. Therefore, the drain outlet of the cold dryer is often blocked due to the high impurity content.

[0003] However, the condensate drain outlet of the cold dryer generally adopts an automatic drainer instead of a normally open drain pipe. The reason is that the airflow running inside the cold dryer is often composed of compressed air. If the aperture of the drainer is too large or the discharge time is too long, it will cause the compressed air to be lost, and the air pressure inside the cold dryer will be insufficient, affecting normal operation. Therefore, a high-precision automatic drainer is often used. However, due to the limitation of the high precision of the automatic drainer, the above-mentioned blockage situation is aggravated.

[0004] To this end, many dryer drainer modifications often involve larger apertures and manual operation, relying on manual proficiency to address clogging and compressed air loss. However, this isn't a long-term solution. As factory production lines become more automated, dryers also need to be upgraded to address both clogging and air pressure maintenance.

[0005] Therefore, how to provide a cold dryer condensate drainage anti-blocking system that can effectively prevent the cold dryer condensate drainage from being blocked and can automatically clean the waste intelligently has become a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0006] The object of the present invention is to provide a condensate drainage and anti-blocking system for a cold dryer to solve the problems in the above-mentioned background technology.

[0007] According to one aspect of the present invention, a cold dryer condensate drainage and anti-blocking system is provided, comprising a precooler, an evaporator, a filter separator, and a drainer;

[0008] The precooler is provided with a wet air inlet, a wet air outlet, a return air inlet and a compressed air outlet, the wet air inlet and the wet air outlet are connected through a tube side, and the return air inlet and the compressed air outlet are connected through a shell side;

[0009] The inlet of the evaporator is connected to the wet gas outlet of the precooler, the outlet of the evaporator is connected to the inlet of the filter separator, and low-pressure refrigerant steam is introduced into the refrigerant pipe provided in the evaporator;

[0010] A filter element is provided in the filter separator, and the air flow containing condensed water entering the filter separator is filtered by the filter element and then discharged from the top outlet of the filter separator to the return air inlet of the precooler;

[0011] The drainer is arranged at the bottom end of the filter separator, and includes a drain port, a drain valve, a sewage outlet, a piston head and a sewage outlet valve. The bottom end of the filter separator is arranged in a sharp ridge shape with the middle higher than the two sides. The drain port is arranged at the top of the sharp ridge shape, and the drain valve is installed on the pipe of the drain port;

[0012] Two sewage storage chambers are formed on both sides of the pointed shape, the sewage outlet is arranged at the bottom end of the sewage storage chamber, and the sewage valve is installed on the pipe of the sewage outlet; the top of the sewage storage chamber is not higher than the drain outlet, and a top sealing plate with an opening is provided, and the top sealing plate is gradually lowered from the outer end to the opening, and the piston head is vertically movably installed above the opening position of the top sealing plate, and the piston head opens or closes the opening of the top sealing plate according to the buoyancy of the condensed water.

[0013] Optionally, according to the cold dryer condensate drainage and anti-blocking system of the present invention, the buoyancy properties of the piston head are set according to the following rules:

[0014] When the water level of the condensed water is higher than the height of the opening of the top sealing plate by ≥ half the total height of the piston head, the buoyancy of the piston head is greater than the pressure of the compressed air in the filter separator, thereby opening the opening of the top sealing plate;

[0015] When the water level of the condensed water is higher than the height of the opening of the top sealing plate and is less than half the total height of the piston head, the buoyancy of the piston head is less than the pressure of the compressed air in the filter separator and the opening of the top sealing plate is closed.

[0016] Optionally, according to the cold dryer condensate drainage and anti-blocking system of the present invention, a rain eaves structure is provided above the drain outlet, and the inclined surfaces of the rain eaves structure extend above the sewage cavities on both sides respectively.

[0017] Optionally, according to the cold dryer condensate drainage and anti-blocking system of the present invention, the piston head is installed based on a vertical guide rod, the guide rod is installed in the filter separator, and the piston head and the guide rod are slidably matched.

[0018] Optionally, according to the cold dryer condensate drainage and anti-blocking system of the present invention, a liquid level sensor is installed in the filter separator, and the liquid level sensor is associated with the drain valve so that the drain valve triggers opening and closing actions.

[0019] Optionally, according to the cold dryer condensate drainage anti-blocking system described in the present invention, a ring-shaped infrared counter-radiation sensor group is provided at the top of the sewage storage chamber, and the infrared counter-radiation sensor group is associated with the sewage valve so that the sewage valve triggers opening and closing actions.

[0020] Optionally, according to the cold dryer condensate drainage anti-blocking system of the present invention, a travel switch is installed at the opening of the top sealing plate or on the guide rod, and the travel switch is used to detect whether the piston head closes the opening of the top sealing plate.

[0021] Optionally, according to the cold dryer condensate drainage anti-blocking system described in the present invention, the travel switch is associated with the drain valve and the sewage valve. When the drain valve is triggered to complete the drainage action within a set time, the travel switch does not detect that the piston head has moved into place, and it is judged that the infrared counter-radiation sensor group is faulty or the opening of the top sealing plate is abnormally blocked. At this time, the infrared counter-radiation sensor is disabled, and the sewage valve is opened for a set period of time and then automatically closed. If the piston head falls and the travel switch is triggered, the normal control process is returned; if the piston head still does not fall and the travel switch still does not trigger, the alarm device is turned on to issue a warning.

[0022] Optionally, according to the cold dryer condensate drainage and anti-blocking system of the present invention, the guide rod is sheathed with a flexible bellows closed protective sleeve.

[0023] Optionally, according to the cold dryer condensate drainage and anti-blocking system of the present invention, the lower end surface of the piston head that cooperates with the opening of the top sealing plate is set to be a conical surface.

[0024] The present invention has outstanding substantial features and significant progress compared to the prior art. Specifically, the present invention has the following advantages:

[0025] 1. Two outlets are designed in the filter separator, one is a drain outlet and the other is a sewage outlet. The height of the drain outlet is higher, the angle of the sewage outlet is lower, and an inclined surface is set. When condensed water mixed with debris accumulates at the bottom, the debris will settle to the bottom and enter the sewage storage chamber. The automatic drainage task regularly discharges the upper clean water, so the drain valve can be kept clean and not easy to clog. Even if a small amount of tiny suspended particles enters, it is difficult to affect the normal operation of the drain valve. Its normal operation can be guaranteed through regular maintenance; when the debris accumulates to a certain height or amount, the sewage valve is opened for cleaning, thereby realizing the separation of drainage and sewage.

[0026] 2. To solve the problem of compressed air loss caused by sewage or water discharge, a piston head is added to the filter separator. A top sealing plate is installed at the top of the sewage storage chamber with an opening. The piston head matches the opening. When the buoyancy is greater than the internal gas pressure, the piston head opens the top sealing plate, allowing heavier debris to enter the sewage storage chamber and accumulate. When the liquid level reaches the set height, drainage is triggered, and the piston head descends with the liquid level until it closes the opening of the top sealing plate. At this time, the internal gas pressure is greater than the buoyancy. Since there is no conduction between the internal and external spaces during the drainage process, no compressed air is lost. Due to the long accumulation time and the need for sedimentation, the sewage discharge process is usually triggered during the non-drainage period. At this time, due to the low external liquid level, the piston head closes the top sealing plate. After the sewage discharge valve is opened, negative pressure is formed in the sewage storage chamber, and the piston head is tightly plugged in the opening of the top sealing plate, so no compressed air is lost. If sewage is discharged and water is drained at the same time, due to the falling liquid level, the piston head will still promptly close the opening of the top sealing plate of the sewage storage chamber under the pressure of the internal compressed air, thereby preventing compressed air loss during the sewage discharge process. This self-locking mechanism prevents compressed air loss at all times.

[0027] 3. Add sensors for control. Drainage and sewage discharge are triggered by liquid level sensing, while the detection of the piston head in position needs to be triggered separately in conjunction with the drain valve and sewage valve. The reason is that the debris in the sewage storage chamber is hard debris. After being raised, it is easy to bulge abnormally and hinder the piston head from falling back. The abnormal bulge is often local, resulting in the infrared beam sensor group not being triggered. Therefore, if the travel switch is not triggered after drainage, it means there is an obstacle. At this time, it is necessary to drain the sewage in time to remove impurities and solve the problem of raising and bulging. If all executable operations are invalid and the piston head still cannot fall back, it means that the debris is too large and is stuck in the opening of the top sealing plate, triggering an alarm and timely maintenance.

[0028] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0030] Figure 1 It is a schematic diagram of the condensate drainage and anti-blocking system of the cold dryer in the present invention.

[0031] Figure 2 This is one of the principle diagrams of the drainer in the cold dryer condensate drainage and anti-blocking system of the present invention.

[0032] Figure 3 This is the second schematic diagram of the drainer in the cold dryer condensate drainage and anti-blocking system of the present invention.

[0033] Description of reference numerals:

[0034] 1. Precooler; 2. Evaporator; 3. Filter separator; 4. Drainer;

[0035] 11. Moisture inlet; 12. Moisture outlet; 13. Return air inlet; 14. Compressed air outlet; 21. Refrigerant pipe; 22. Evaporator inlet; 23. Evaporator outlet; 31. Filter element;

[0036] 41. Drain outlet; 42. Drain valve; 43. Sewage storage chamber; 44. Drain outlet; 45. Piston head; 46. Drain valve; 47. Top sealing plate; 48. Opening of the top sealing plate; 49. Guide rod; 50. Eaves structure. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0038] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0039] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0040] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0041] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0042] according to Figures 1 to 3 As shown, the present invention provides a cold dryer condensate water drainage and anti-blocking system, including a precooler 1, an evaporator 2, a filter separator 3 and a drainer 4.

[0043] The precooler 1 is provided with a wet gas inlet 11, a wet gas outlet 12, a return gas inlet 13 and a compressed air outlet 14. The wet gas inlet 11 and the wet gas outlet 12 are connected through the tube side, and the return gas inlet 13 and the compressed air outlet 14 are connected through the shell side.

[0044] The inlet 22 of the evaporator is connected to the wet gas outlet 12 of the precooler 1 , the outlet 23 of the evaporator is connected to the inlet of the filter separator 3 , and the refrigerant low-pressure steam is introduced into the refrigerant pipe 21 provided in the evaporator 2 .

[0045] A filter element 31 is provided in the filter separator 3 , and the air flow containing condensed water entering the filter separator 3 is filtered by the filter element 31 and then discharged from the top outlet of the filter separator 3 to the return air inlet 13 of the precooler 1 .

[0046] The drainer 4 is arranged at the bottom end of the filter separator 3. The drainer 4 includes a drain port 41, a drain valve 42, a sewage outlet 44, a piston head 45 and a sewage valve 46. The bottom end of the filter separator 3 is set to a sharp edge shape with the middle higher than the two sides. The drain port 41 is set at the top of the sharp edge shape, and the drain valve 42 is installed on the pipe of the drain port 41.

[0047] Two sewage storage chambers 43 are formed on both sides of the pointed shape, a sewage outlet 44 is arranged at the bottom end of the sewage storage chamber 43, and a sewage valve 46 is installed on the pipe of the sewage outlet 44; a top sealing plate 47 with an opening is provided at the top of the sewage storage chamber 43 not higher than the drain outlet 41, and the top sealing plate 47 is gradually lowered from the outer end to the opening, and the piston head 45 is vertically movably installed above the opening 48 of the top sealing plate. The piston head 45 opens or closes the opening 48 of the top sealing plate according to the buoyancy of the condensed water.

[0048] Two outlets are designed in the filter separator 3, a drain outlet 41 and a sewage outlet 44. The height of the drain outlet 41 is relatively high, and the angle of the sewage outlet 44 is relatively low, and an inclined surface is provided. When condensed water mixed with debris accumulates at the bottom, the debris will settle to the bottom and enter the sewage storage chamber 43. The automatic drainage task regularly discharges the upper clean water, so that the drain valve 42 can be kept clean and not easily blocked. Even if a small amount of tiny suspended particles enters, it is difficult to affect the normal operation of the drain valve 42. Its normal operation can be guaranteed by regular maintenance; when the debris accumulates to a certain height or amount, the sewage valve 46 is opened for cleaning, thereby realizing the separation of drainage and sewage.

[0049] The buoyancy properties of the piston head 45 are set according to the following rules:

[0050] When the water level of the condensed water is higher than the height of the opening 48 of the top sealing plate and is greater than or equal to half the total height of the piston head 45, the buoyancy of the piston head 45 is greater than the pressure of the compressed air in the filter separator 3 and the opening 48 of the top sealing plate is opened;

[0051] When the water level of the condensed water is higher than the opening 48 of the top sealing plate and is less than half the total height of the piston head 45 , the buoyancy of the piston head 45 is less than the pressure of the compressed air in the filter separator 3 and the opening 48 of the top sealing plate is closed.

[0052] In order to solve the problem of compressed air loss caused by sewage or water discharge, a piston head 45 is added to the filter separator 3, and a top sealing plate 47 is installed at the top of the sewage storage chamber 43 and opened. The piston head 45 matches the opening. When the buoyancy is greater than the internal gas pressure, the piston head 45 opens the top sealing plate 47, and heavier debris enters the sewage storage chamber 43 and accumulates. When the liquid level reaches the set height, drainage is triggered, and the piston head 45 drops with the liquid level until the opening 48 of the top sealing plate is closed. At this time, the internal gas pressure is greater than the buoyancy. Since there is no conduction between the internal and external spaces during the drainage process, no compressed air is lost. Since the accumulation time is long and sedimentation is required, it is usually triggered during non-drainage time. At this time, since the external liquid level is not high, the piston head 45 closes the top sealing plate 47. After the sewage valve 46 is opened, negative pressure is formed in the sewage storage chamber 43, and the piston head 45 is tightly plugged in the opening 48 of the top sealing plate, so that no compressed air is lost; if sewage is discharged while draining, due to the drop in liquid level, the piston head 45 will still close the opening of the top sealing plate 47 of the sewage storage chamber 43 in time under the pressure of the internal compressed air, thereby avoiding the loss of compressed air during sewage discharge; through this self-locking mechanism, the loss of compressed air is always avoided.

[0053] Furthermore, a rain eave structure 50 is provided above the drain outlet 41, with the slopes of the rain eave structure 50 extending above the drainage chambers on both sides. This ensures that debris enters the drainage chamber through the slopes of the rain eave structure 50 and settles there. The condensed water, due to its inherent fluidity, does not affect the drainage process.

[0054] Furthermore, the piston head 45 is mounted on a vertical guide rod 49, which is mounted in the filter separator 3. The piston head 45 slides with the guide rod 49. The guide rod 49 guides and limits the movement of the piston head 45 to ensure effective engagement with the opening 48 of the top sealing plate.

[0055] Furthermore, the lower end surface of the piston head 45 that mates with the opening 48 of the top sealing plate is configured as a conical surface. Since the top sealing plate 47 is configured to gradually descend from the outer end toward the opening, the piston head 45 with the conical lower end surface can stably mate with the piston head 45, ensuring that the piston head 45 completely seals the opening 48 of the top sealing plate.

[0056] Furthermore, a liquid level sensor is installed in filter separator 3. This level sensor is linked to drain valve 42, triggering the opening and closing of drain valve 42. When the liquid level reaches a set height, drain valve 42 opens, allowing relatively clean condensate to drain out drain port 41 while retaining heavier impurities in dirt storage chamber 43. As the liquid level drops, piston head 45 closes top seal plate 47.

[0057] Furthermore, a ring-shaped infrared sensor group is installed at the top of the sewage storage chamber 43. This infrared sensor group is connected to the sewage discharge valve 46 so that the sewage discharge valve 46 triggers the opening and closing of the sewage discharge valve 46. When sewage discharge is required, the sewage discharge valve 46 is opened. At this time, the piston head 45 is often in a closed state. As the sewage discharge progresses, the air pressure inside the sewage storage chamber 43 decreases, and the stability of the piston head 45 increases. In contrast, the internal high air pressure will not escape from the sewage storage chamber 43. Even if the piston head 45 is in the open state during sewage discharge, as the sewage discharge progresses and the liquid level drops, the piston head 45 can still promptly close the opening 48 of the top sealing plate to prevent the high air pressure from escaping.

[0058] Furthermore, a travel switch is installed at the opening 48 of the top sealing plate or on the guide rod 49. The travel switch is used to detect whether the piston head 45 closes the opening 48 of the top sealing plate. Under normal circumstances, within a set time after the drain valve 42 is triggered to complete the drainage action, the travel switch will detect that the piston head 45 has returned to its position.

[0059] Furthermore, the travel switch is associated with the drain valve 42 and the sewage valve 46. When the drain valve 42 is triggered to complete the drainage action within the set time, the travel switch does not detect that the piston head 45 has moved into place, and it is judged that the infrared counter-radiation sensor group is faulty or the opening 48 of the top sealing plate is abnormally blocked. At this time, the infrared counter-radiation sensor is disabled, and the sewage valve 46 is opened for a set period of time and then automatically closed. If the piston head 45 falls and the travel switch is triggered, the normal control process is returned; if the piston head 45 still does not fall and the travel switch is still not triggered, the alarm device is turned on to issue a warning.

[0060] Furthermore, a flexible bellows enclosed protective sleeve is provided on the outer surface of the guide rod 49 to protect the guide rod 49 from being corroded by condensed water, thereby preventing the piston head 45 from operating normally on the guide rod 49 .

[0061] Basic working principle:

[0062] The drain outlet 41 is higher than the sewage outlet 44 and the sewage storage chamber 43. During the water accumulation process, the sewage will first enter the top sealing plate 47 under the guidance of the rain eaves structure 50 and accumulate around the piston head 45. When the condensed water accumulates enough, the piston head 45 is lifted by buoyancy, and the opening 48 of the top sealing plate is opened. The debris will fall into the sewage storage chamber 43 and settle under the influence of its own weight and the vibration of the equipment operation. A small part of the suspended particles or light floating objects rise with the liquid level. These fine impurities are not likely to affect drainage and can be ignored. They can be cleaned regularly during daily maintenance.

[0063] When the liquid level reaches the set height, the drain valve 42 opens, and the relatively clean condensed water is discharged from the drain port 41, while the heavier impurities are retained in the dirt storage chamber 43. As the liquid level drops, the piston head 45 closes the top sealing plate 47.

[0064] When sewage needs to be discharged, the sewage discharge valve 46 is opened. At this time, the piston head 45 is often in a closed state. As the sewage is discharged, the air pressure inside the sewage storage chamber 43 is smaller, and the stability of the piston head 45 is higher. The internal high air pressure will not escape from the sewage storage chamber 43.

[0065] Even if the piston head 45 is in an open state during sewage discharge, as the sewage discharge proceeds, the liquid level drops, and the piston head 45 can still close the opening 48 of the top sealing plate in time to prevent high pressure from escaping.

[0066] Regarding intelligent control, as long as the sensor is used as the main factor, a liquid level sensor (not shown in the figure) is installed in the filter separator 3. The liquid level sensor is associated with the drain valve 42 so that the drain valve 42 triggers the opening and closing actions. The height of the liquid level sensor is usually set at a position higher than a certain height of the drain outlet 41 so that as much water as possible can be discharged at one time.

[0067] A ring-shaped infrared radiation sensor group (not shown) is provided at the top of the sewage storage chamber 43. The infrared radiation sensor group is associated with the sewage valve 46 so that the sewage valve 46 triggers the opening and closing actions. The purpose of the ring design is to avoid false alarms caused by partial obstruction or covering of the infrared radiation sensor. Only when all the sensors are blocked can they be triggered, thereby improving accuracy.

[0068] A travel switch (not shown) is installed at the opening 48 of the top sealing plate or on the guide rod 49. The travel switch is used to detect whether the piston head 45 has closed the opening 48 of the top sealing plate. The travel switch is associated with the drain valve 42 and the sewage valve 46.

[0069] Under normal circumstances, when the drain valve 42 is triggered to complete the draining action, within a set time, the travel switch will detect that the piston head 45 has returned to its original position.

[0070] If the travel switch does not detect that the piston head 45 has moved into place, it is judged that the infrared counter-radiation sensor group is faulty or the opening 48 of the top sealing plate is abnormally blocked, such as a local irregular bulge, and the infrared counter-radiation sensor is not triggered. At this time, the system determines that the infrared counter-radiation sensor has failed and opens the drain valve 46. After a set time, the drain valve 46 is automatically closed to empty the debris in the sewage storage chamber 43. If the piston head 45 falls and the travel switch is triggered, it proves that the abnormal bulge has been resolved and returns to the normal control process.

[0071] If the piston head 45 still does not fall and the travel switch still does not trigger, the alarm device is turned on to issue a warning, and maintenance personnel intervene to perform maintenance.

[0072] Add sensors for control, drainage and sewage discharge follow the liquid level sensing trigger, and the detection of the piston head 45 in place needs to be triggered separately in conjunction with the drain valve 42 and the sewage valve 46. The reason is that the debris in the sewage storage chamber 43 is hard debris, which is prone to abnormal bulge after being raised and hinder the piston head 45 from falling back. The abnormal bulge is often local, resulting in the infrared radiation sensor group not being triggered. Therefore, if the travel switch is not triggered after drainage, it means there is an obstacle. At this time, it is necessary to discharge sewage in time to remove impurities and solve the problem of raising and bulging. If all executable operations are invalid and the piston head 45 still cannot fall back, it means that the debris is too large and is stuck in the opening 48 of the top sealing plate, triggering an alarm and timely maintenance.

[0073] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A cold dryer condensate drainage anti-blocking system, characterized in that: Including precooler, evaporator, filter separator and drainer; The precooler is provided with a wet air inlet, a wet air outlet, a return air inlet and a compressed air outlet, the wet air inlet and the wet air outlet are connected through a tube side, and the return air inlet and the compressed air outlet are connected through a shell side; The inlet of the evaporator is connected to the wet gas outlet of the precooler, the outlet of the evaporator is connected to the inlet of the filter separator, and low-pressure refrigerant steam is introduced into the refrigerant pipe provided in the evaporator; A filter element is provided in the filter separator, and the air flow containing condensed water entering the filter separator is filtered by the filter element and then discharged from the top outlet of the filter separator to the return air inlet of the precooler; The drainer is arranged at the bottom end of the filter separator, and includes a drain port, a drain valve, a sewage outlet, a piston head and a sewage outlet valve. The bottom end of the filter separator is arranged in a sharp ridge shape with the middle higher than the two sides. The drain port is arranged at the top of the sharp ridge shape, and the drain valve is installed on the pipe of the drain port; Two sewage storage chambers are formed on both sides of the pointed edge shape, the sewage outlet is provided at the bottom end of the sewage storage chamber, and the sewage valve is installed on the pipeline of the sewage outlet; a top sealing plate with an opening is provided at the top of the sewage storage chamber, not higher than the drainage outlet, and the top sealing plate is gradually lowered from the outer end to the opening, and the piston head is vertically movably installed above the opening position of the top sealing plate, and the piston head opens or closes the opening of the top sealing plate according to the buoyancy of the condensed water; A liquid level sensor is installed in the filter separator, and the liquid level sensor is associated with the drain valve so that the drain valve triggers the opening and closing actions; A ring-shaped infrared sensor group is provided at a high position of the sewage storage chamber. The infrared sensor group is associated with the sewage valve so that the sewage valve triggers the opening and closing actions. A travel switch is installed at the opening of the top sealing plate or on the guide rod, and the travel switch is used to detect whether the piston head has closed the opening of the top sealing plate; The travel switch is associated with the drain valve and the sewage valve. When the travel switch does not detect that the piston head has moved into place within a set time after the drain valve is triggered to complete the drainage action, it is determined that the infrared counter-radiation sensor group is faulty or the opening of the top sealing plate is abnormally blocked. At this time, the infrared counter-radiation sensor is disabled, and the sewage valve is opened for a set time and then automatically closed. If the piston head falls and the travel switch is triggered, the normal control process is returned; if the piston head still does not fall and the travel switch still does not trigger, the alarm device is turned on to issue a warning.

2. The cold dryer condensate drainage and anti-blocking system according to claim 1, characterized in that: The buoyancy properties of the piston head are set according to the following rules: When the water level of the condensed water is higher than the height of the opening of the top sealing plate by ≥ half the total height of the piston head, the buoyancy of the piston head is greater than the pressure of the compressed air in the filter separator, thereby opening the opening of the top sealing plate; When the water level of the condensed water is higher than the height of the opening of the top sealing plate and is less than half the total height of the piston head, the buoyancy of the piston head is less than the pressure of the compressed air in the filter separator and the opening of the top sealing plate is closed.

3. The cold dryer condensate drainage and anti-blocking system according to claim 1, characterized in that: A rain eave structure is provided above the drain outlet, and the inclined surfaces of the rain eave structure extend above the sewage discharge cavities on both sides respectively.

4. The cold dryer condensate drainage and anti-blocking system according to claim 2, characterized in that: The piston head is installed based on a vertical guide rod, the guide rod is installed in the filter separator, and the piston head is slidably matched with the guide rod.

5. The cold dryer condensate drainage and anti-blocking system according to claim 4, characterized in that: The guide rod is sheathed with a flexible bellows closed protective sheath.

6. The cold dryer condensate drainage and anti-blocking system according to claim 4, characterized in that: The lower end surface of the piston head that matches the opening of the top sealing plate is set to be a conical surface.

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