Multi-parallel-connection type aluminum plate refrigeration dryer

Abstract

The utility model discloses a multi-parallel aluminum plate cold dryer, and relates to the technical field of compressed air drying. The plate heat exchanger comprises a plurality of sets of parallel plate heat exchangers made of all-aluminum materials, modular rapid connection is achieved through a gas collecting pipe and a groove type hoop connector, the plate heat exchangers are integrated with a precooler, an evaporator and a gas-water separator, a vacuum brazing aluminum plate fin structure is adopted, and an air and refrigerant alternate flowing channel is formed. In the refrigerating system, a compressor suction and exhaust pipe is provided with a high-low pressure protection device, an energy regulating valve balances system pressure, and the temperature of an evaporator is stabilized at about 3 DEG C to avoid ice blockage; the water-cooling type condenser is provided with a flow regulating valve, and the air-cooling type condenser is provided with a pressure switch of a fan. And the precooler and the evaporator are connected in series to recover cold energy and reduce energy consumption. The all-aluminum gas collecting pipeline is integrated with a pressure / temperature sampling port, and is convenient to install and resistant to corrosion. The device has the advantages of high heat exchange efficiency, compact structure, pollution resistance, easiness in expansion and the like, and is suitable for industrial-grade compressed air efficient clean drying scenes.

Description

TECHNICAL FIELD

[0001] The utility model relates to compressed air cold dryer technical field especially relates to a kind of multiple parallel type aluminium plate replacement cold dryer. BACKGROUND

[0002] The compressed air cold dryer commonly used in current industrial field is mainly shell-and-tube type, and its core structure is composed of pre-cooler, evaporator, gas-water separator and other components, the heat exchange system and the part in contact with compressed air are generally made of carbon steel, and the evaporator core is copper tube sleeve fin structure. This kind of equipment has significant defects: on the one hand, the carbon steel shell layer is easy to rust after long-term contact with humid compressed air, which leads to clean air being contaminated by rust and impurities, affecting the stability of downstream precision equipment; on the other hand, the shell-and-tube heat exchanger is bulky, which needs to occupy a large amount of effective area of air compression station, especially in the compact industrial scene, the equipment layout and expansion are difficult. In addition, the copper tube sleeve fin structure has complex processing technology, limited heat exchange efficiency, and high refrigerant filling amount, which further increases energy consumption and maintenance cost.

[0003] The existing patent CN214620311U discloses a multi-system plate-type cold dryer, which forms a multi-system parallel structure by arranging multiple one-to-one corresponding regenerators, evaporators and gas-liquid separators in the case, effectively improving the indoor space utilization. This design shortens the air flow path through modular layout, reduces the volume of individual heat exchange units, and provides a new idea for solving the land occupation problem of traditional cold dryers. However, this scheme still has room for improvement: the material selection of the heat exchange unit is not specified, and if carbon steel or copper pipe structure is still used, rust pollution and heat exchange efficiency bottleneck cannot be avoided; at the same time, the integrated way of multi-system parallel connection relies on complex pipeline connection, and the installation convenience and system expandability need to be improved, and there is no optimization scheme for pressure and temperature control of refrigerant circulation, which may cause evaporator ice blockage or excessive energy consumption.

[0004] In view of the rust pollution, bulkiness of traditional shell-and-tube cold dryer and the shortcomings of existing multi-system plate structure, the utility model provides a multiple parallel type aluminium plate replacement cold dryer. By using a full-aluminum plate-fin heat exchanger, a high-efficiency heat exchange unit is formed by vacuum brazing process, which fundamentally solves the problem of carbon steel rusting and significantly reduces the size of the equipment; the gas collecting pipe and the groove type clamp joint are innovatively designed to realize quick parallel installation and flexible expansion of multiple plate replacement modules; and intelligent control components such as energy regulating valve, high-low pressure protection switch and the like are integrated to accurately regulate the temperature and pressure of the evaporator, avoid ice blockage and improve energy efficiency. The above improvements effectively make up for the defects of existing technology in terms of cleanliness, compactness and reliability, and meet the high requirements of industrial-grade compressed air drying. SUMMARY

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-parallel aluminum plate heat exchange dryer.

[0006] The system includes multiple sets of parallel plate heat exchangers and air collection pipes. The air collection pipes include an air inlet pipe and an air outlet pipe. The same air inlet pipe is connected in parallel to the side of each parallel plate heat exchanger, and the same air outlet pipe is connected in parallel to the top of each parallel plate heat exchanger. Both the air inlet and outlet pipes have inlet and outlet flanges at their opening ends. The bottom of both the air inlet and outlet pipes has multiple grooved clamp joints, the same number as the number of parallel plate heat exchangers. The parallel plate heat exchangers are all-aluminum heat exchangers, integrating a precooler, evaporator, gas-liquid separator, drain outlet, first refrigerant channel, and second refrigerant channel. The precooler and evaporator use an aluminum plate-fin structure, with the aluminum plates, fins, and seals welded together using vacuum brazing to form channels for alternating air and refrigerant flow. The refrigerated dryer also includes a refrigeration system, which includes a compressor, condenser, dryer filter, thermal expansion valve, and refrigerant gas-liquid separator.

[0007] Furthermore, sealing strips are welded to the contact points and edges of the aluminum plate fin structure, and the heat exchange area between adjacent aluminum plates is increased through the fins, forming a heat exchange unit with high mechanical strength and good sealing performance.

[0008] Furthermore, the gas collection pipe is welded from all aluminum profiles, and integrates aluminum flanges, aluminum pipes, pressure sampling ports, and temperature sampling ports on the pipeline.

[0009] Furthermore, a low-pressure protection switch and a refrigerant low-pressure gauge are installed on the compressor's suction pipe, and a high-pressure protection switch and a refrigerant high-pressure gauge are installed on the discharge pipe; the compressor's discharge port is connected to an energy regulating valve through a pipe, and the other end of the energy regulating valve is connected to a gas-liquid separator.

[0010] Furthermore, condensers are divided into water-cooled and air-cooled types; water-cooled condensers are equipped with a flow regulating valve at the cooling water inlet, which automatically controls the water inflow based on the refrigerant high-pressure signal; air-cooled condensers are connected to a fan, and the operation and shutdown of the fan are controlled by a fan pressure switch.

[0011] Furthermore, the outlet of the condenser is connected in sequence to a dryer filter and a thermal expansion valve. The outlet of the thermal expansion valve is connected to the evaporator. The outlet of the evaporator is connected to a refrigerant gas-liquid separator. The outlet of the refrigerant gas-liquid separator is connected to the compressor suction port.

[0012] Furthermore, the air-water separator is connected to the evaporator outlet to separate condensate from the compressed air, and the separated condensate is discharged through the drain outlet.

[0013] Further, the multiple parallel plate exchangers are connected with the gas collecting pipe through the groove type hoop joint to form a modular parallel structure, and each plate exchanger can be used independently or in combination with multiple plate exchangers.

[0014] Further, the pre-cooler and the evaporator are connected in series, compressed air is first exchanged with low-temperature dry air discharged from the pre-cooler and the evaporator, and then is secondarily exchanged with low-temperature low-pressure liquid refrigerant, and finally, dry air is discharged after being separated by the gas-water separator.

[0015] The utility model discloses the beneficial effect is:

[0016] 1. The utility model discloses a multiple parallel aluminum plate exchanger structure and all aluminum design, solve the traditional cold dry machine volume big, the problem of rust pollution, have remarkable beneficial effect: all aluminum material heat exchanger adopts vacuum brazing process, forms high -efficient heat exchange unit, and the contact point is much, and the sealing property is good, and heat exchange efficiency is high and compact structure, and the volume is reduced by 40% or more than traditional machine type, and the refrigerant filling amount is less, and the weight is light, and multiple parallel modular design realizes quick installation and flexible extension through the gas collecting pipe and the groove type hoop joint, and is suitable for different processing air volume demand, and the refrigeration system integrates energy regulating valve, high -low voltage protection switch and self -adaptation condensing control, ensures that the evaporator temperature is stable at about 3 DEG C, avoids ice block and improves the operation reliability, and the pre-cooler and evaporator series connection design realize the cold quantity recovery, reduce the energy consumption, and the all aluminum pipeline prevents rust, guarantees that compressed air is clean, and is suitable for industrial grade high reliability drying scene.

[0017] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, which can be implemented according to the content of the specification, and in order to let the above and other purposes, characteristics and advantages of the utility model can be more obvious and easy to understand, the following preferred embodiments are taken, and the detailed description is as follows. DETAILED DESCRIPTION

[0018] Figure 1 A three-dimensional assembly structure schematic view of a multiple parallel aluminum plate exchanger cold dryer is provided for the utility model;

[0019] Figure 2 A single aluminum plate heat exchanger structure schematic view of a multiple parallel aluminum plate exchanger cold dryer is provided for the utility model;

[0020] Figure 3 An aluminum multiple parallel quick connection pipeline (gas collecting pipe) structure schematic view of a multiple parallel aluminum plate exchanger cold dryer is provided for the utility model;

[0021] Figure 4 A multiple parallel plate exchanger cold dryer general assembly structure schematic view of a multiple parallel aluminum plate exchanger cold dryer is provided for the utility model.

[0022] In the diagram: 1. Air inlet; 2. Air outlet; 3. Precooler; 4. Evaporator; 5. Gas-water separator; 6. Drain outlet; 7. First refrigerant passage; 8. Second refrigerant passage; 9. Inlet / outlet flange; 10. Grooved clamp joint; 11. Gas collecting pipe; 12. Air inlet gas collecting pipe; 13. Air outlet gas collecting pipe; 14. Multiple parallel plate heat exchangers. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Example 1

[0025] I. Overall Structure

[0026] like Figures 1-4 As shown, the refrigerated dryer includes multiple sets of parallel plate heat exchangers 14, air collection pipes 11, and a supporting refrigeration system.

[0027] Multi-parallel plate heat exchanger 14: Made entirely of aluminum, it integrates a precooler 3, an evaporator 4, a gas-water separator 5, etc. The aluminum plates, plate fins and seals are welded together by vacuum brazing process to form alternating flow medium channels, including a first refrigerant channel 7 and a second refrigerant channel 8. It has the advantages of high heat exchange efficiency, compact structure, corrosion resistance, avoidance of carbon steel rust contamination, and high pressure resistance.

[0028] Air collection pipe 11: including air inlet collection pipe 12 and air outlet collection pipe 13, both of which are welded from all aluminum profiles. Both ends are equipped with inlet and outlet flanges 9. The bottom end is connected in parallel to the side and top of the multi-parallel plate heat exchanger 14 through grooved clamp joint 10 to achieve rapid installation and efficient airflow distribution.

[0029] II. Compressed Air Processing Flow

[0030] Primary heat exchanger - precooler:

[0031] High-temperature and humid compressed air enters the air inlet collecting pipe 12 from the air inlet 1, and is distributed to the precoolers 3 of each parallel plate heat exchanger. It then undergoes convective heat exchange with the low-temperature and dry air discharged from the evaporator 4, which initially cools the air and recovers the cold energy, thereby reducing the subsequent refrigeration load.

[0032] Secondary heat exchanger - evaporator:

[0033] The pre-cooled air enters the evaporator 4 and undergoes forced heat exchange with the low-temperature, low-pressure liquid refrigerant through the first refrigerant channel 7 and the second refrigerant channel 8. The temperature is further reduced to the pressure dew point, about 3°C, and the water vapor in the air condenses into liquid water.

[0034] Air-water separation and drainage:

[0035] Air carrying condensed water enters the air-water separator 5, liquid water is separated and collected to the drainage outlet 6 for discharge, and the dry low-temperature air returns to the pre-cooler 3, exchanges heat with the newly flowing high-temperature air, and is discharged from the air outlet 2 through the air outlet manifold 13, reducing the relative humidity of the outlet air and saving energy consumption.

[0036] III. Refrigerant circulation process

[0037] Compression and condensation:

[0038] High-temperature and high-pressure gaseous refrigerant discharged by the refrigeration compressor enters the condenser through the exhaust pipe. The condenser adopts water-cooled or air-cooled type:

[0039] Water-cooled type: The cooling water inlet is provided with a flow regulating valve, which automatically adjusts the water inlet according to the high-pressure refrigerant to ensure the condensation efficiency;

[0040] Air-cooled type: The fan is controlled by a fan pressure switch to start and stop, adjusting the heat dissipation intensity.

[0041] After releasing heat, the refrigerant is condensed into high-temperature and high-pressure liquid, which removes impurities and moisture through a drying filter.

[0042] Throttling and evaporation:

[0043] The liquid refrigerant is throttled by a thermal expansion valve to become low-temperature and low-pressure liquid, which enters the evaporator 4 to exchange heat with the compressed air, absorbs heat to vaporize into gas, and returns to the compressor suction port after separating the liquid refrigerant through a refrigerant gas-liquid separation device.

[0044] Pressure and temperature control:

[0045] The compressor suction pipe is provided with a low-pressure protection switch and a refrigerant low-pressure gauge, and the exhaust pipe is provided with a high-pressure protection switch and a refrigerant high-pressure gauge to monitor the system pressure in real time;

[0046] The energy regulating valve connects the compressor exhaust pipe and suction pipe to adjust the refrigerant flow when the exhaust temperature is abnormal, balance the system pressure, ensure that the evaporator temperature is stable at ≈3℃, and avoid ice blockage.

[0047] Working principle

[0048] I. Through the reverse heat exchange between compressed air and refrigerant, the condensation separation of water vapor in the air is realized, combined with the multi-parallel aluminum plate exchange structure and intelligent control, and high-efficiency dry compressed air is produced. The core process is divided into compressed air treatment cycle and refrigerant thermodynamic cycle, which are directly coupled through the evaporator 4 to form an energy exchange closed loop.

[0049] II. Compressed air treatment process

[0050] The high-temperature and high-humidity compressed air in the pre-cooling stage enters the air inlet manifold 12 from the air inlet 1, and is divided into each parallel plate exchanger pre-cooler 3 through the grooved clamp joint 10.

[0051] In the pre-cooler, the high-temperature air is forced to exchange heat with the low-temperature and dry air discharged from the evaporator 4 in counterflow, and the temperature is reduced to 40-50℃, while the low-temperature air is heated, and the cold energy is recovered to reduce the subsequent refrigeration energy consumption.

[0052] The pre-cooled air enters the evaporator 4, and exchanges heat with the low-temperature and low-pressure liquid refrigerant in the pipe through the aluminum plate fins to further reduce the temperature of the air to the pressure dew point, and the water vapor is condensed into liquid water droplets due to the temperature being lower than the dew point, forming a "gas-liquid mixed phase".

[0053] The gas-liquid mixed phase enters the gas-water separator 5, and separates the liquid water by using the centrifugal force and the principle of inertial collision. The condensed water is discharged through the drain port 6, and the dry low-temperature air returns to the pre-cooler 3.

[0054] The low-temperature air exchanges heat with the newly flowing high-temperature air in the pre-cooler to be heated to 20-30℃, and the relative humidity is reduced to 40%-50%, and finally discharged from the air outlet 2 to avoid pipe dewing.

[0055] III. Refrigerant thermodynamic cycle

[0056] The compressor compresses the low-temperature and low-pressure gaseous refrigerant flowing out of the evaporator into high-temperature and high-pressure gas, and inputs it into the condenser.

[0057] The high-temperature and high-pressure refrigerant exchanges heat with the cooling water in reverse, and the flow of the cooling water is automatically adjusted by the flow regulating valve according to the high pressure of the refrigerant, so as to ensure that the refrigerant is condensed into high-temperature and high-pressure liquid.

[0058] The air-cooled condenser: the fan is controlled to start and stop by the fan pressure switch, and the refrigerant is liquefied by forced convection heat dissipation. The liquid refrigerant passes through the drying filter to remove water and impurities to avoid the expansion valve being blocked. The liquid refrigerant is rapidly throttled by the thermal expansion valve, the pressure is suddenly reduced to 0.3-0.5MPa, and the temperature is reduced to -5~0℃, forming a low-temperature and low-pressure gas-liquid mixed state, and entering the evaporator 4. The low-temperature and low-pressure refrigerant absorbs the heat of the compressed air in the evaporator 4, and the liquid part is vaporized into gas, and finally forms saturated gaseous refrigerant, which is separated from the remaining liquid droplets by the refrigerant gas-liquid separator, and returns to the suction port of the compressor to complete the cycle.

[0059] Temperature and pressure double closed loop control

[0060] Energy regulating valve: connected in parallel with the compressor exhaust pipe and suction pipe, when the exhaust temperature is too high or too low, the bypass flow is automatically adjusted to balance the refrigerant pressure in the system, to ensure that the evaporator temperature is stable at ≈3℃, to avoid icing and blockage.

[0061] High and low pressure protection: the suction pipe is provided with a low pressure protection switch and a refrigerant low pressure gauge, the exhaust pipe is provided with a high pressure protection switch and a refrigerant high pressure gauge, triggering stop in abnormal situation, preventing compressor damage; the cooling water flow is adjusted according to the refrigerant high pressure, the fan is controlled by the fan pressure switch to realize "on-demand cooling", reducing energy consumption.

[0062] The above merely provides the preferred embodiments of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art, according to the technical scheme and the inventive concept of the present application, can make equivalent replacement or change within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A multi-parallel aluminum plate heat exchanger dryer, characterized in that, The application relates to a cold dryer, which comprises a plurality of groups of parallel plate heat exchangers (14) and a gas collecting pipe (11), the gas collecting pipe (11) comprises an air inlet collecting pipe (12) and an air outlet collecting pipe (13), the same air inlet collecting pipe (12) is connected to the side of the parallel plate heat exchangers (14), the same air outlet collecting pipe (13) is connected to the top of the parallel plate heat exchangers (14), the air inlet collecting pipe (12) and the air outlet collecting pipe (13) are provided with flanges (9) at the opening ends, the bottom ends of the air inlet collecting pipe (12) and the air outlet collecting pipe (13) are provided with a plurality of groove type hoop joints (10) which are the same in number as the parallel plate heat exchangers (14), the parallel plate heat exchangers (14) are full-aluminum heat exchangers, and the cold dryer is integrated with a precooler (3), an evaporator (4), an air-water separator (5), a water outlet (6), a first refrigerant channel (7) and a second refrigerant channel (8), the precooler (3) and the evaporator (4) adopt an aluminum plate-fin structure, the aluminum plate, the plate fin and a sealing strip are welded into shape through a vacuum brazing process, and the channels for the alternate flow of air and refrigerant are formed; the cold dryer further comprises a refrigeration system, and the refrigeration system comprises a compressor, a condenser, a drying filter, a thermal expansion valve and a refrigerant gas-liquid separation device.

2. The multi-parallel type aluminum plate refrigeration dryer according to claim 1, wherein: The contact points and the edge of the aluminum plate-fin structure are welded with sealing strips, the heat exchange area is increased through the plate fins between the adjacent aluminum plates, and the heat exchange unit has high mechanical strength and good sealing performance.

3. The multi-parallel type aluminum plate refrigeration dryer according to claim 1, wherein: The gas collecting pipe (11) is welded from full-aluminum section materials, and the pipe is integrated with an aluminum flange, an aluminum pipe, a pressure sampling port and a temperature sampling port.

4. The multi-parallel type aluminum plate refrigerating and drying machine according to claim 1, wherein: A low-pressure protection switch and a refrigerant low-pressure gauge are arranged on the suction pipe of the compressor, and a high-pressure protection switch and a refrigerant high-pressure gauge are arranged on the exhaust pipe; the exhaust port of the compressor is connected with a pipeline and an energy adjusting valve, and the other end of the energy adjusting valve is connected with the gas-liquid separator.

5. The multi-parallel type aluminum plate refrigeration dryer according to claim 4, wherein: The condenser is divided into a water-cooled type and an air-cooled type; the water inlet of the water-cooled condenser is provided with a flow adjusting valve, and the flow adjusting valve automatically controls the water inlet according to the refrigerant high-pressure signal; the air-cooled condenser is connected with a fan, and the operation and stop of the fan are controlled by a fan pressure switch.

6. The multi-parallel type aluminum plate refrigeration dryer according to claim 5, wherein: The outlet of the condenser is sequentially connected with the drying filter, the thermal expansion valve, the outlet of the thermal expansion valve is connected with the evaporator (4), the outlet of the evaporator (4) is connected with the refrigerant gas-liquid separation device, and the outlet of the refrigerant gas-liquid separation device is connected with the suction port of the compressor.

7. The multi-parallel type aluminum plate-fin cold dryer according to claim 1, characterized in that: The air-water separator (5) is communicated with the outlet of the evaporator (4) and is used for separating the condensed water in the compressed air, and the separated condensed water is discharged through the water outlet (6).

8. The multi-parallel type aluminum plate refrigeration dryer according to claim 1, wherein: The parallel plate heat exchangers (14) are quickly connected with the gas collecting pipe (11) through the groove type hoop joints (10) and form a modular parallel structure, and a single plate heat exchanger can be independently used or a plurality of plate heat exchangers can be combined and used in parallel.

9. The multi-parallel type aluminum plate refrigeration dryer according to claim 1, wherein: The precooler (3) and the evaporator (4) are arranged in series, the compressed air is first exchanged with the low-temperature dry air discharged from the precooler (3) and the evaporator (4), then is secondarily exchanged with the low-temperature low-pressure liquid refrigerant in the evaporator (4), and finally is discharged after being separated by the air-water separator (5).

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