Air convection type heat exchanger

Abstract

The air convection type heat exchanger comprises a cooling cavity, the interior of the cooling cavity is hollow, an upper opening is formed in the top end face of the cooling cavity, a lower opening is formed in the bottom end face of the cooling cavity, a plurality of heat exchange core sets are installed in the cooling cavity in a matched mode, and a draught fan is installed at the top of the cooling cavity in a matched mode. Air enters the cooling cavity from the lower opening of the cooling cavity, flows through the heat exchange core set for heat exchange and then flows out of the cooling cavity through the upper opening, and therefore fluid flowing through the heat exchange core set is cooled. By arranging the cooling cavity, the heat exchange core set and the draught fan, a large amount of air can flow through the heat exchange core set in the cooling cavity, and the efficient convective heat exchange effect can be achieved without cooling water; meanwhile, the structure is compact, the ship space utilization rate can be increased, and the device is suitable for ocean ships.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and in particular to an air convection heat exchanger. Background Art

[0002] As the core equipment of the ship power system, the ship engine converts the chemical energy of fuel into mechanical energy, and then drives the ship propeller to rotate, generating thrust to make the ship move forward.

[0003] In the prior art, plate heat exchangers are generally used for heat dissipation in ship engines. The plate heat exchanger forms flow channels by stacking multiple metal plates, enabling the fluid to be cooled and the external cooling water to form countercurrent heat exchange on both sides of the plates. However, limited by the heat exchange area of the plates and the flow channel structure, the plate heat exchanger needs to be configured with a large volume to achieve the rated heat dissipation, occupying the ship space and resulting in low utilization rate of the ship space. At the same time, the plate heat exchanger requires a large amount of cooling water resources, and is limited in application in environments with scarce fresh water resources or poor water quality, and is difficult to be applied to ocean-going ships. Summary of the Invention

[0004] The applicant of the present invention aims at the above-mentioned disadvantages in the existing production technology, and provides an air convection heat exchanger with a reasonable structure. By setting a cooling cavity, a heat exchange core group and a fan, a large amount of air can flow through the heat exchange core group in the cooling cavity, and efficient convection heat exchange effect can be achieved without cooling water. At the same time, its structure is compact, which can improve the utilization rate of ship space and is applicable to ocean-going ships.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An air convection heat exchanger includes a cooling cavity. The interior of the cooling cavity is hollow. An upper opening is provided on the top end face of the cooling cavity, and a lower opening is provided on the bottom end face of the cooling cavity. A plurality of groups of heat exchange core groups are installed in the cooling cavity in a matching manner. A fan is installed on the top of the cooling cavity in a matching manner. Under the negative pressure of the fan, air enters the cooling cavity from the lower opening of the cooling cavity, flows through the heat exchange core group for heat exchange, and then flows out of the cooling cavity through the upper opening, thereby cooling the fluid flowing through the heat exchange core group.

[0007] As a further improvement of the above technical solution:

[0008] A single group of heat exchange core groups includes several core tubes arranged horizontally at intervals in parallel. A plurality of fins are simultaneously installed on the outer circumferential surface of the core tubes, and the fins are uniformly arranged at intervals along the axial direction of the core tubes.

[0009] The cross-section of a single core tube is elliptical.

[0010] A single fin is made of copper, aluminum, titanium or stainless steel.

[0011] On opposite side walls of the cooling chamber, liquid collection chambers are respectively and fittingly installed. One liquid collection chamber is correspondingly connected to the fluid inlet end of the heat exchange core group, and the other liquid collection chamber is correspondingly connected to the fluid outlet end of the heat exchange core group.

[0012] A single liquid collection chamber includes a cavity for storing fluid. The cavity is enclosed by an arc-shaped plate and a sealing orifice plate. Several through-holes for fluid passage are provided on the end face of the sealing orifice plate.

[0013] Several connectors are fittingly installed on a single arc-shaped plate.

[0014] A single sealing orifice plate is a square thin plate.

[0015] A single fan includes a motor. The output end of the motor is connected to an installation sleeve, and several blades evenly spaced along the circumference are fittingly installed on the outer circumferential surface of the installation sleeve.

[0016] A circular cover plate is fittingly installed outside a single fan.

[0017] The beneficial effects of the present invention are as follows:

[0018] The structure of the present invention is compact and reasonable, and the operation is convenient. By adopting the air convection method to efficiently exchange heat with the fluid inside the pipeline, the heat exchange efficiency is effectively improved. It can realize efficient heat exchange through the fin and air convection heat exchange under the condition of no external cooling water, and can also work normally in harsh environments; by setting the core tube with an elliptical cross-section, its thermal conductivity can be increased, and the wind resistance when the external air flows through the core tube can be reduced, thereby increasing the flow rate of the air flowing through the fins, increasing the heat exchange efficiency and also reducing the working pressure of the fan. Under the same heat exchange power, the volume of the heat exchanger can be effectively reduced.

[0019] The present invention is modularly assembled by a cooling chamber, a heat exchange core group, and a fan. The module function boundaries are obvious, and each module can be independently disassembled and inspected. When a single module fails due to a fault, the module can be quickly produced and installed, realizing convenient disassembly and inspection of the equipment, low operation and maintenance costs, and safe and reliable operation. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the present invention.

[0021] Figure 2 It is an exploded view of the present invention.

[0022] Figure 3 It is a schematic structural diagram of the heat exchange core group in the present invention.

[0023] Figure 4 It is a front view (partial) of the heat exchange core group in the present invention.

[0024] Figure 5This is a schematic diagram of the present invention in the working state.

[0025] Among them: 1. Cooling chamber; 2. Motor; 3. Heat exchange core group; 4. Support leg; 5. Mounting bushing; 6. Blade; 7. Cover plate; 8. Arc plate; 9. Sealing orifice plate; 10. Joint; 11. Through hole; 12. Support frame; 301. Core tube; 302. Finned tube. Detailed implementation manner

[0026] The following combines with the attached drawings to illustrate the detailed implementation manner of the present invention.

[0027] The structure and function of the present invention are as follows:

[0028] As Figures 1 - 5 shown, an air convection heat exchanger includes a cooling chamber 1 with a hollow interior. The top end face of the cooling chamber 1 is provided with an upper opening, and the bottom end face of the cooling chamber 1 is provided with a lower opening. A plurality of groups of heat exchange core groups 3 are installed in the cooling chamber 1 in a matching manner. A blower is installed at the top of the cooling chamber 1. Under the negative pressure of the blower, air enters the cooling chamber 1 from the lower opening of the cooling chamber 1, flows through the heat exchange core group 3 for heat exchange, and then flows out of the cooling chamber 1 through the upper opening, thereby cooling the fluid flowing through the heat exchange core group 3. By setting the cooling chamber 1, the heat exchange core group 3 and the blower, a large amount of air can flow through the heat exchange core group 3 in the cooling chamber 1, and an efficient convection heat exchange effect can be achieved without using cooling water; at the same time, its structure is compact, which can improve the space utilization rate of the ship and is suitable for ocean-going ships.

[0029] A single group of heat exchange core groups 3 includes several core tubes 301 arranged horizontally and spaced parallel to each other. A plurality of finned tubes 302 are installed on the outer circumferential surface of the core tube 301, and the finned tubes 302 are evenly spaced along the axial direction of the core tube 301. By setting the core tube 301, it is used to allow the fluid to pass through; by setting the finned tubes 302 in direct contact with the core tube 301, the heat exchange area of the core tube 301 can be increased, so that when the blower works, a large amount of air can enter the gap between the finned tubes 302 from bottom to top, ensuring that the fluid in the core tube 301 can be fully heat exchanged.

[0030] The cross-section of a single core tube 301 is elliptical, that is, the core tube 301 uses a flat tube, which can increase the thermal conductivity coefficient. Compared with the traditional round tube, it can reduce the wind resistance of the external air flowing through the core tube 301, thereby increasing the flow rate of the air flowing through the finned tubes 302, increasing the heat exchange efficiency while reducing the working pressure of the blower, and thus effectively reducing the volume of the heat exchanger under the same heat exchange power.

[0031] A single finned tube 302 is made of copper, aluminum, titanium or stainless steel. By using a material with a high thermal conductivity coefficient, the heat of the fluid inside the core tube 301 can be fully transferred to the finned tube 302 with good thermal conductivity.

[0032] On opposite side walls of the cooling chamber 1, liquid collection chambers are respectively and fittingly installed. One liquid collection chamber is correspondingly connected to the fluid inlet end of the heat exchange core group 3, and the other liquid collection chamber is correspondingly connected to the fluid outlet end of the heat exchange core group 3. By providing the liquid collection chambers, it is convenient for the fluid to enter and exit the heat exchange core group 3.

[0033] A single liquid collection chamber includes a cavity for storing fluid. The cavity is enclosed by an arc-shaped plate 8 and a sealing orifice plate 9. A plurality of through holes 11 for the fluid to pass through are provided on the end face of the sealing orifice plate 9. The through holes 11 correspond one by one to the core tubes 301 inside the cooling chamber 1. By connecting the through holes 11 to the corresponding core tubes 301, the fluid in the cavity can flow into the heat exchange core group 3, or the fluid in the heat exchange core group 3 can flow into the cavity.

[0034] A plurality of connectors 10 are fittingly installed on a single arc-shaped plate 8. The connectors 10 are used to connect with an external conveying pipe group.

[0035] A single sealing orifice plate 9 is made of a square thin plate.

[0036] A single fan includes a motor 2. The output end of the motor 2 is connected to an installation bushing 5. A plurality of blades 6 evenly spaced along the circumference are fittingly installed on the outer circumferential surface of the installation bushing 5. By providing the installation bushing 5 and the blades 6, a rotatable fan structure is formed; when the motor 2 is energized to drive the installation bushing 5 to rotate, the blades 6 are driven to rotate at a high speed, thereby creating an air negative pressure field above the heat exchange core group 3.

[0037] An annular cover plate 7 is fittingly installed outside a single fan. The cover plate 7 is used to protect the blades 6. The cover plate 7 is fixed to the top of the cooling chamber 1. A support frame 12 is fixed on the inner side wall surface of the cover plate 7, and the corresponding fan is supported by the support frame 12.

[0038] A plurality of support legs 4 are fittingly installed at the bottom of the cooling chamber 1, which are used to support the entire heat exchanger and facilitate air to enter the interior of the cooling chamber 1 from the lower opening when the fan is working.

[0039] The working process of the present invention is as follows:

[0040] As Figure 5 shown, connect the connector 10 on one liquid collection chamber to the feed pipe group, and connect the connector 10 on the other liquid collection chamber to the discharge pipe group;

[0041] The fluid to be heat-exchanged flows into the corresponding liquid collection chamber through the feed pipe group, and flows into the corresponding core tube 301 through the corresponding through hole 11. During the fluid flow process, heat is transferred to the fins 302. The densely arranged heat exchange fins 302 greatly increase the area of convective heat exchange with the air;

[0042] Meanwhile, the fan is powered on and starts to rotate at a high speed to create a negative-pressure air field. A large amount of air enters the cooling chamber 1 through the lower opening. When flowing through the heat exchange core group 3, it exchanges heat fully with the fins 302, and then flows out of the cooling chamber 1 through the upper opening.

[0043] The fluid after heat exchange flows into another liquid collection chamber through the corresponding through holes 11, then flows out of the heat exchanger through the discharge pipe group and flows into the rear-end equipment.

[0044] The above description is an explanation of the present invention, not a limitation thereof. The scope defined by the present invention is referred to the claims, and any form of modification can be made within the protection scope of the present invention.

Claims

1. An air convection heat exchanger, characterized in that: It includes a cooling chamber (1) which is hollow inside. An upper opening is provided on the top end face of the cooling chamber (1), and a lower opening is provided on the bottom end face of the cooling chamber (1). A plurality of heat exchange core groups (3) are fitted and installed inside the cooling chamber (1). A blower is fitted and installed on the top of the cooling chamber (1). Under the negative pressure of the blower, air enters the cooling chamber (1) from the lower opening of the cooling chamber (1), flows through the heat exchange core group (3) for heat exchange, and then flows out of the cooling chamber (1) through the upper opening, thereby cooling the fluid flowing through the heat exchange core group (3).

2. The air convection heat exchanger according to claim 1, characterized in that: A single heat exchange core group (3) includes several core tubes (301) arranged in parallel at intervals in the horizontal direction. A plurality of fins (302) are simultaneously installed on the outer circumferential surface of the core tube (301), and the fins (302) are evenly arranged at intervals along the axial direction of the core tube (301).

3. The air convection heat exchanger according to claim 2, wherein: The cross-section of a single core tube (301) is elliptical.

4. The air convection heat exchanger according to claim 3, wherein: A single fin (302) is made of copper, aluminum, titanium or stainless steel.

5. The air convection heat exchanger according to claim 1, wherein: Liquid collecting chambers are respectively fitted and installed on the opposite side walls of the cooling chamber (1). One liquid collecting chamber is correspondingly connected to the fluid inlet end of the heat exchange core group (3), and the other liquid collecting chamber is correspondingly connected to the fluid outlet end of the heat exchange core group (3).

6. The air convection heat exchanger according to claim 5, wherein: A single liquid collecting chamber includes a cavity for storing fluid, and the cavity is surrounded by an arc-shaped plate (8) and a sealing orifice plate (9). A plurality of through holes (11) for fluid to pass through are provided on the end face of the sealing orifice plate (9).

7. The air convection heat exchanger according to claim 6, wherein: A plurality of connectors (10) are fitted and installed on a single arc-shaped plate (8).

8. The air convection heat exchanger according to claim 6, characterized in that: A single sealing orifice plate (9) is a square thin plate.

9. The air convection heat exchanger according to claim 1, wherein: A single blower includes a motor (2). The output end of the motor (2) is connected to an installation bushing (5), and a plurality of blades (6) evenly distributed at intervals along the circumference are fitted and installed on the outer circumferential surface of the installation bushing (5).

10. The air convection heat exchanger according to claim 1, wherein: A circular cover plate (7) is fitted and installed outside a single blower.

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