Integrated heat exchanger for a freeze drier

Abstract

The utility model discloses an integrated heat exchanger suitable for frozen drying machine, including the casing, the casing is equipped with the outlet of drying gas, the inlet of water gas, the coolant outlet and the coolant inlet from top to bottom, the upper portion is equipped with the heat exchanger in the casing, still be equipped with the evaporimeter in the casing, still be equipped with the gas liquid separation chamber of gas in the bottom of casing, the evaporimeter is located heat exchanger below and communicates with the heat medium outlet of heat exchanger, the backflow channel of gas is established between evaporimeter and heat exchanger and the inside of casing, and the gas outlet of evaporimeter and the cold medium inlet of heat exchanger communicate with backflow channel. The utility model divides and sets up the upper and lower end in the casing with heat exchange and evaporation function, can simplify the structure setting in the casing, and the production cost is simplified, after setting evaporimeter below heat exchanger, can realize the step -by -step cooling of airflow from top to bottom, is favorable to the gathering of condensate in the bottom of casing and gas -water separation in the cooling process, thereby guaranteeing the drying effect of gas.

Description

Technical Field

[0001] This utility model relates to a heat exchanger, specifically an integrated heat exchanger suitable for refrigerated dryers. Background Technology

[0002] A refrigerated dryer is a device that uses the principle of heat exchange between refrigerant and compressed air to convert humid compressed air into dry compressed air. Although the refrigerated dryer obtains cooling capacity through a refrigerant system to achieve condensation and cooling, the core of its performance is the heat exchanger system, especially the evaporator and the inlet and outlet gas heat exchangers. Currently, commonly used methods on the market include integrated aluminum plate-fin heat exchangers or stainless steel brazed plate heat exchangers, as well as split shell-and-tube heat exchangers (with built-in tube-fin structure).

[0003] For example, Chinese patent document CN110514036B discloses a high-efficiency heat exchange and water removal structure for a compressed gas refrigerated dryer, which can improve the problems of existing equipment such as non-compact structure, poor gas-liquid separation effect, easy ice blockage, and large pressure difference between the inlet and outlet of compressed gas. It includes a vertically arranged first pipe and a second pipe located inside the first pipe. A refrigeration chamber is provided between the inside of the first pipe and the outer wall of the second pipe. The refrigeration chamber has a refrigeration source outlet and a refrigeration source inlet. One or more fourth pipes are located within the refrigeration chamber. A gas-liquid separation chamber is located at the lower part of the refrigeration chamber. A liquid collection chamber is located at the lower part of the first pipe. It also includes a third pipe, one end of which is connected to the outside, and the other end is connected to the upper part of the liquid collection chamber. The second pipe has a gas inlet connected to its interior. Gas enters through the gas inlet, is cooled by the refrigeration chamber, and undergoes gas-liquid separation in the gas-liquid separation chamber, resulting in condensate. The condensate flows to the liquid collection chamber, and the gas is finally discharged from the gas outlet through the third pipe.

[0004] While the existing technology effectively integrates inlet and outlet heat exchangers and evaporators, with a clever heat exchange process and small size, and achieves water-gas separation through a gas-liquid separation chamber, thus effectively improving the gas-liquid separation effect, it also integrates multiple functions within the first tube, including heat exchange, refrigeration, gas-water separation, and condensate drainage and storage. This results in a complex internal spatial structure within the first tube, significantly increasing the manufacturing cost of the equipment. Furthermore, the refrigerant fluid flows through the shell-side channel in the cold cavity, which may lead to a large accumulation of refrigerant. Utility Model Content

[0005] To address the technical problem of high production costs caused by complex heat exchange structures in existing compressed air refrigerated dryers, this utility model provides an integrated heat exchanger suitable for refrigerated dryers. The heat exchanger includes a shell, from top to bottom, with an outlet for drying gas, an inlet for water-containing gas, a refrigerant outlet, and a refrigerant inlet. A heat exchanger is located in the upper part of the shell, and an evaporator is also located inside the shell. A gas-liquid separation chamber is located at the bottom of the shell. The evaporator is located below the heat exchanger and is connected to the heat medium outlet of the heat exchanger. A gas return channel is provided between the evaporator, the heat exchanger, and the interior of the shell, and the return channel is connected to the gas outlet of the evaporator and the refrigerant inlet of the heat exchanger.

[0006] Compared with existing technologies, this solution separates the heat exchange and evaporation functions at the upper and lower ends of the shell. On the one hand, this simplifies the internal structure of the shell and reduces production costs. On the other hand, by placing the evaporator below the heat exchanger, it enables the airflow to be cooled step by step from top to bottom. This facilitates the accumulation of condensate at the bottom of the shell and the separation of gas and water during the cooling process, thereby ensuring the drying effect of the gas.

[0007] Preferably, the heat exchanger uses an aluminum plate-fin heat exchanger core. In this design, the use of an aluminum plate-fin heat exchanger core and the use of counter-current or cross-current flow to achieve gas heat exchange can effectively improve the gas heat exchange efficiency. Furthermore, under the same heat exchange load conditions, the volume of the aluminum plate-fin heat exchanger core allows for a smaller heat exchanger size.

[0008] Preferably, the gas-liquid separation chamber is equipped with a two-stage gas-liquid separator. In this design, the two-stage gas-liquid separator can effectively separate the gas from the condensate, ensuring a stable gas drying effect.

[0009] Preferably, the two-stage gas-liquid separator includes gas-liquid separators respectively located in the reflux channel and at the evaporator outlet, with the gas-liquid separator in the reflux channel positioned below the heat exchanger. In this design, by installing gas-liquid separators in the reflux channel and at the evaporator outlet, effective separation of gas and condensate can be achieved, and the airflow reversal at the bottom further improves the gas-liquid separation effect.

[0010] Preferably, the gas-liquid separator uses a wire mesh demister. In this design, using a wire mesh demister as the gas-liquid separator can further improve the gas-liquid separation effect.

[0011] Preferably, the return channel is equipped with a baffle to prevent airflow backflow. In this design, the baffle effectively prevents airflow backflow, thereby further improving the gas-liquid separation effect.

[0012] Preferably, the obstruction element is a baffle plate, which is connected to the tail end of the evaporator. In this design, a baffle plate is used to prevent the backflow of airflow, resulting in a simple structure.

[0013] Preferably, the baffle is positioned facing inwards into the return channel and at an angle of less than 90° to the horizontal direction. In this design, the angled arrangement of the baffle effectively blocks the backflow of gas while also guiding the condensate in the gas.

[0014] Preferably, the shell is a pressure-bearing metal outer shell. In this design, the pressure-bearing metal outer shell enables the integrated heat exchanger to operate at high pressures, thus expanding its applicability.

[0015] Preferably, a condensate drain outlet is provided at the bottom of the shell. In this design, the condensate drain outlet facilitates the discharge of condensate.

[0016] This utility model has the following beneficial effects:

[0017] 1. It adopts an aluminum plate-fin heat exchanger core and uses counter-flow or cross-flow heat exchange, which has high heat exchange efficiency. Under the same heat exchange load conditions, the volume of the heat exchanger core can be controlled to be smaller, thus making the integrated heat exchanger miniaturized.

[0018] 2. The inlet and outlet gas heat exchanger and evaporator are integrated into one structure, and the airflow is cooled step by step from top to bottom, which is conducive to the condensate in the cooling process to collect and separate at the bottom of the integrated heat exchanger.

[0019] 3. The bottom of the shell is equipped with a two-stage wire mesh defoaming structure, and the baffles make the return channel have an airflow baffle structure, which can block the backflow of gas, achieve effective separation of gas and condensate, and ensure stable gas drying effect;

[0020] 4. The pressure-bearing metal shell is used as the pressure-bearing structure, and the pressure-bearing capacity of the shell can be adjusted to flexibly adapt to various high-pressure working conditions;

[0021] 5. The integrated shell-and-tube structure features a simple overall external structure, facilitating modular design: standard individual heat exchanger components are fabricated according to a specific heat transfer load, and then stacked in parallel to achieve greater processing capacity. The shell-and-tube structure itself allows for easy external insulation, assembly of multiple components, and convenient connection of pipes and manifolds. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an embodiment of the integrated heat exchanger of this utility model applicable to a refrigerated dryer. Detailed Implementation

[0023] The following detailed description illustrates the specific implementation method:

[0024] 1. Definition

[0025] Refrigerant: refers to the refrigerant.

[0026] Evaporator: A device that converts liquid substances into gaseous substances. Low-temperature condensed liquid passes through the evaporator and exchanges heat with the outside air, vaporizing and absorbing heat to achieve a cooling effect.

[0027] Plate-fin heat exchangers typically consist of baffles, fins, seals, and guide vanes. Fins, guide vanes, and seals are placed between adjacent baffles to form a sandwich layer called a channel. These sandwich layers are stacked according to different fluid flow patterns and brazed into a whole to form a plate bundle, which is the core of the plate-fin heat exchanger.

[0028] Wire mesh demister: A gas-liquid separation device in which gas passes through the wire mesh of the demister to remove entrained mist.

[0029] 2. The reference numerals in the accompanying drawings include: shell 1, inlet 11, outlet 12, condensate discharge port 13, refrigerant inlet 14, refrigerant outlet 15, heat exchanger 2, evaporator 3, gas-liquid separation chamber 4, baffle 5, and gas-liquid separator 6.

[0030] illustrate: Figure 1 In the diagram, different arrows are used to indicate the flow direction of the gas and the refrigerant, respectively.

[0031] The basic implementation examples are as follows: Figure 1 As shown: An integrated heat exchanger suitable for refrigerated dryers includes a shell 1, which is a pressure-bearing metal outer shell. From top to bottom, the shell 1 has a drying gas outlet 12, a water-containing gas inlet 11, a refrigerant outlet 15, and a refrigerant inlet 14. A condensate drain outlet 13 is provided at the bottom of the shell 1. In this embodiment, the shell 1 is a steel cylindrical outer shell.

[0032] A heat exchanger 2 is provided in the upper part of the shell 1. The heat exchanger 2 adopts an aluminum plate-fin heat exchanger core.

[0033] An evaporator 3 is also provided inside the shell 1. The evaporator 3 is located below the heat exchanger 2 and is connected to the heat medium outlet of the heat exchanger 2.

[0034] A gas-liquid separation chamber 4 is also provided at the bottom of the shell 1. The gas-liquid separation chamber 4 is equipped with a two-stage gas-liquid separator 6, which is a wire mesh demister. The two-stage gas-liquid separator 6 includes gas-liquid separators 6 respectively located in the reflux channel and gas outlet 12. The gas-liquid separator 6 located in the reflux channel is set lower than the heat exchanger 2.

[0035] A gas reflux channel is provided between the evaporator 3 and the heat exchanger 2 and the interior of the shell 1. The reflux channel is connected to the gas outlet 12 of the evaporator 3 and the cold medium inlet 11 of the heat exchanger 2. A baffle 5 is provided in the reflux channel to prevent the airflow from flowing back. In this embodiment, the baffle 5 is a baffle plate, which is connected to the tail of the evaporator 3. The baffle plate is set facing into the reflux channel and the angle with the horizontal direction is less than 90°.

[0036] The specific implementation process is as follows: Water-containing gas enters the upper heat exchanger 2 through inlet 11 on the shell 1 for heat exchange. After heat exchange, the gas enters the lower evaporator 3 for secondary heat exchange, then enters the lower gas-liquid separation chamber 4. After passing through baffles, it enters the reflux channel. The gas in the reflux channel then enters the heat exchanger 2 through the cold medium inlet and exchanges heat with the water-containing gas subsequently entering the heat exchanger 2. Finally, the dried gas after heat exchange flows out of the integrated heat exchanger through outlet 12 at the upper part of the shell 1.

[0037] After the gas enters the gas-liquid separation chamber 4, it passes through the two-stage gas-liquid separator 6, and the condensate gathers at the bottom of the shell 1 and is discharged from the shell 1 through the condensate discharge port 13.

[0038] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An integrated heat exchanger suitable for a freeze dryer, comprising a housing, the housing being provided with, from top to bottom, an outlet for dry gas, an inlet for water-containing gas, an outlet for refrigerant, and an inlet for refrigerant; the housing being provided with a heat exchanger at the upper portion inside the housing, and further provided with an evaporator inside the housing, and further provided with a gas-liquid separation chamber for gas at the bottom of the housing; characterized in that: The evaporator is located below the heat exchanger and communicates with the heat medium outlet of the heat exchanger; a gas backflow channel is arranged between the evaporator and the heat exchanger and the inside of the shell, and the backflow channel communicates with the gas outlet of the evaporator and the cold medium inlet of the heat exchanger.

2. The integrated heat exchanger suitable for use in a freeze dryer according to claim 1, wherein: The heat exchanger adopts an aluminum plate-fin heat exchanger inner core.

3. The integrated heat exchanger suitable for use in a freeze dryer according to claim 2, wherein: A two-stage gas-liquid separator is arranged in the gas-liquid separation chamber.

4. The integrated heat exchanger suitable for use in a freeze dryer according to claim 3, wherein: The two-stage gas-liquid separator includes gas-liquid separators arranged in the backflow channel and at the outlet of the evaporator respectively, and the gas-liquid separator arranged in the backflow channel is lower than the heat exchanger.

5. The integrated heat exchanger suitable for use in a freeze dryer according to claim 4, wherein: The gas-liquid separator adopts a wire mesh demister.

6. The integrated heat exchanger suitable for use in a freeze dryer according to any one of claims 1-5, wherein: A blocking piece for blocking gas flow backflow is arranged in the backflow channel.

7. The integrated heat exchanger suitable for use in a freeze dryer according to claim 6, wherein: The blocking piece is a baffle, and the baffle is connected to the tail of the evaporator.

8. The integrated heat exchanger suitable for use in a freeze dryer of claim 7, wherein: The baffle is arranged in the backflow channel and has an angle less than 90° with the horizontal direction.

9. The integrated heat exchanger suitable for use in a freeze dryer of claim 8, wherein: The shell is a pressure-bearing metal shell.

10. The integrated heat exchanger suitable for use in a freeze dryer of claim 9, wherein: A condensate discharge port is arranged at the bottom of the shell.

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