An intracavity muffler heat exchanger

Abstract

The present invention relates to an intracavity sound-absorbing heat exchanger, comprising a shell, with heads symmetrically arranged at both ends of the shell, the inner surface of each head covered with a sound absorber, a sealing plate arranged at the open portion of each head to isolate the internal space of the head from the internal space of the shell, a plurality of first mounting holes being opened on the sealing plate, a heat exchange component being cooperatively installed between the two sealing plates, the heat exchange component being formed by splicing a plurality of heat exchange tube groups in the length direction, a plurality of cavity baffles being evenly installed between the outer wall of the heat exchange component and the inner wall of the shell, a plurality of second mounting holes being opened on the two semicircular surfaces of a single cavity baffle, and the heat exchange component being cooperatively installed with the cavity baffle through the second mounting holes. By arranging the sound absorber and the cavity baffle, the intracavity sound-absorbing heat exchanger can reduce the noise intensity and increase the sound transmission loss without being equipped with a silencer, thereby enabling the intracavity sound-absorbing heat exchanger to meet the use requirements of ship acoustic stealth.

Description

Technical Field

[0001] The present invention relates to the technical field of ship acoustic stealth, in particular to an intra-cavity silencing heat exchanger. Background Art

[0002] A large number of power units and auxiliary equipment on ships require water cooling through shell-and-tube heat exchangers to ensure their normal operation. Cooling water enters the heat exchanger tubes through the inlet, exchanges heat with the hot fluid, and is then discharged through the tube outlet. During this heat exchange process, the following noise sources may occur:

[0003] (1) Pipeline components connected to the heat exchanger, such as pumps and valves, will generate noise;

[0004] (2) Fluid turbulence disturbance generates hydrodynamic noise;

[0005] (3) There is acoustic-vibration coupling between the shell side and the tube side;

[0006] The noise propagates along the pipeline and radiates outward, seriously affecting the acoustic stealth performance of the ship.

[0007] In the existing technology, noise control is achieved by adding silencers to the inlet and outlet pipes of the heat exchanger. However, due to the high speed of water sound, the heat exchanger needs to be equipped with a larger silencer. Large-sized silencers are often difficult to install due to installation space limitations. If small-sized silencers are used, the noise reduction effect is poor and cannot meet the requirements of ship acoustic stealth. Summary of the Invention

[0008] In response to the shortcomings of the above-mentioned prior art, the applicant provides a rationally structured intracavity silencer heat exchanger. By arranging a sound-absorbing body and a cavity baffle, the structural characteristics of the shell and tube heat exchanger are fully utilized to exert its silencer potential, so that the intracavity silencer heat exchanger can reduce noise intensity and increase sound transmission loss without being equipped with a silencer, thereby enabling the intracavity silencer heat exchanger to meet the use requirements of ship acoustic stealth. At the same time, the present invention does not increase its own volume, has low requirements for installation space, and can adapt to various working conditions.

[0009] The technical solutions adopted in the present invention are as follows:

[0010] A cavity silencer heat exchanger comprises a hollow thin-walled shell, with hemispherical heads symmetrically arranged at both ends of the shell, the inner surface of each head is covered with a sound-absorbing body for sound absorption, and a sealing plate is provided at the open part of each head to isolate the internal space of the head from the internal space of the shell, and a plurality of first mounting holes are opened on the sealing plate, and a heat exchange component is installed between the two sealing plates. The heat exchange component is formed by splicing a plurality of heat exchange tube groups in the length direction, and a plurality of cavity baffles are evenly installed between the outer wall of the heat exchange component and the inner wall of the shell, and each cavity baffle is semi-disc-shaped and has a cavity arranged therein, and a plurality of second mounting holes are opened on the two semicircular surfaces of a single cavity baffle, respectively, and the heat exchange component is installed in cooperation with the cavity baffle through the second mounting holes.

[0011] As a further improvement of the above technical solution:

[0012] The interior of a single cavity baffle is a hollow structure, and the second mounting holes on the two semicircular surfaces of the same cavity baffle are arranged alternately.

[0013] The heat exchange tubes installed on the same cavity baffle share the fluid space inside the cavity baffle.

[0014] The structure of the heat exchange assembly is as follows: it includes a first heat exchange tube group, a second heat exchange tube group, a third heat exchange tube group and a fourth heat exchange tube group. The first heat exchange tube group and the second heat exchange tube group are used to connect the sealing plate and the cavity baffle, the third heat exchange tube group and the fourth heat exchange tube group are used to connect the two cavity baffles, and the first heat exchange tube group, the second heat exchange tube group, the third heat exchange tube group and the fourth heat exchange tube group are symmetrical about the center of the heat exchange assembly.

[0015] The connection length of the second heat exchange tube group is longer than the connection length of the first heat exchange tube assembly, and the connection length of the fourth heat exchange tube group is longer than the connection length of the third heat exchange tube assembly.

[0016] A plurality of guide grooves are evenly arranged on the surface of a single sound absorbing body, and a plurality of hollow and spherical sound absorbing cavities are evenly arranged inside the single sound absorbing body.

[0017] The cross section of the guide groove is a V-shaped structure.

[0018] The sound absorbing body is made of rubber.

[0019] A first inlet and a first outlet are provided on the side wall of the shell.

[0020] The two heads are provided with openings for the pipe-side fluid to flow in or out. The opening on one head is the second inlet, and the opening on the other head is the second outlet.

[0021] The beneficial effects of the present invention are as follows:

[0022] The present invention has a compact and reasonable structure and is easy to operate. By arranging a sound-absorbing body, resistive sound absorption is achieved; by arranging a cavity baffle, reactive sound absorption is achieved. As a result, the intracavity sound-absorbing heat exchanger takes into account the advantages of resistive sound absorption and reactive sound absorption to achieve effective noise control in a wide frequency domain, greatly improves the sound transmission loss, and reduces the sound radiation of the pipeline. At the same time, the shell and tube heat exchanger's own structural characteristics are used to exert its sound absorption potential, which can reduce the requirements for installation space and expand the application range of the intracavity sound-absorbing heat exchanger.

[0023] The present invention also has the following advantages:

[0024] (1) The sound absorbing cavity inside the sound absorbing body of the present invention has a certain reflection effect on the sound waves, which increases the propagation distance of the sound waves in the sound absorbing body, thereby facilitating energy dissipation.

[0025] (2) In the present invention, the sound-absorbing cavity and the rubber material form a mass-spring system, which causes structural resonance under the excitation of sound waves, realizes mode conversion, and converts longitudinal waves into transverse waves, thereby increasing the energy loss of the rubber material.

[0026] (3) In the present invention, a guide groove is provided on the sound absorbing body to guide the pipe-side fluid, thereby smoothing the flow field and reducing the pulsation intensity of the pipe-side fluid.

[0027] (4) The heat exchange tube bundle of the heat exchange assembly in the present invention and the cavity of the cavity baffle constitute a resistant sound-absorbing structure. The heat exchange tubes installed on the same cavity baffle share the fluid space inside the cavity baffle to increase the expansion ratio of the resistant structure and improve the sound-absorbing effect.

[0028] (5) The second mounting holes on the two semicircular surfaces of the same cavity baffle in the present invention are staggered to increase the structural sound reflection effect.

[0029] (6) The baffle cavity in the present invention can also play a role in stabilizing flow and buffering, which helps to reduce the intensity of hydrodynamic noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is the front view of the present invention.

[0031] Figure 2 for Figure 1 Cross-sectional view of section AA.

[0032] Figure 3 It is an exploded view of the present invention.

[0033] Figure 4 It is a structural schematic diagram of the present invention.

[0034] Figure 5 It is a schematic diagram of the internal structure of the present invention.

[0035] Figure 6It is an exploded view of the internal structure of the present invention.

[0036] Figure 7 for Figure 5 Bottom view of .

[0037] Figure 8 It is a structural schematic diagram of the head in the present invention.

[0038] Figure 9 for Figure 8 Right view of .

[0039] Figure 10 for Figure 8 main view.

[0040] Figure 11 for Figure 10 Cross-sectional view of section BB.

[0041] Figure 12 It is a structural schematic diagram of the hollow cavity baffle of the present invention.

[0042] Figure 13 for Figure 12 main view.

[0043] Figure 14 for Figure 12 rear view.

[0044] Wherein: 1. Shell; 2. Closing plate; 3. Head; 4. First mounting hole; 5. Cavity baffle; 6. Heat exchange assembly; 7. Second mounting hole; 8. First inlet; 9. First outlet; 10. Second inlet; 11. Second outlet; 12. Sound absorber;

[0045] 601, first heat exchange tube group; 602, second heat exchange tube group; 603, third heat exchange tube group; 604, fourth heat exchange tube group;

[0046] 1201. Diversion trough; 1202. Sound absorption cavity. DETAILED DESCRIPTION

[0047] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0048] The structure and function of the present invention are as follows:

[0049] like Figures 1-14As shown, an intracavity sound-absorbing heat exchanger includes a hollow thin-walled shell 1, with hemispherical heads 3 symmetrically arranged at both ends of the shell 1, and the inner surface of each head 3 is covered with a sound-absorbing body 12 for sound absorption, and a sealing plate 2 is provided at the open part of each head 3 to isolate the internal space of the head 3 from the internal space of the shell 1, and a plurality of first mounting holes 4 are opened on the sealing plate 2. A heat exchange component 6 is installed between the two sealing plates 2. The heat exchange component 6 is spliced ​​in the length direction by an array of heat exchange tube groups. A plurality of cavity baffles 5 are evenly installed between the outer wall of the heat exchange component 6 and the inner wall of the shell 1. Each cavity baffle 5 is semi-disc-shaped and has a cavity arranged therein. A plurality of second mounting holes 7 are respectively opened on the two semicircular surfaces of a single cavity baffle 5, and the heat exchange component 6 is installed in cooperation with the cavity baffle 5 through the second mounting holes 7. The shell 1 constitutes the overall framework of the intracavity silencer heat exchanger, and the sealing plate 2 isolates the shell 1 from the internal space of the head 3. The space formed by the sealing plate 2 and the head 3 is a fluid steady flow area, which has a steady flow effect on the tube-side fluid; the first mounting hole 4 on the sealing plate 2 is used to install the heat exchange component 6, and to connect the internal space of the heat exchange component 6 with the internal space of the head 3; the heat exchange component 6 is composed of a plurality of heat exchange tubes of different lengths, and the heat exchange tubes respectively connect the internal cavity of the head 3 with the internal cavity of the cavity baffle 5, the internal cavities of the two cavity baffles 5, and the internal cavity of the cavity baffle 5 with the internal cavity of the head 3; the cavity baffle 5 divides the interior of the shell 1 into different areas, and the shell-side fluid flows in the multiple shell-side cavities formed by the cavity baffle 5 and the shell 1, and exchanges heat with the tube-side fluid.

[0050] The cavity baffle 5 and the heat exchange component 6 constitute a resistant sound-absorbing structure with sudden impedance changes. According to the analysis of the influence of the resistance structure parameters on the acoustic performance, by connecting multiple heat exchange tubes to a cavity baffle 5 at the same time, the expansion ratio of the resistance structure can be increased, thereby improving the sound-absorbing effect; at the same time, the cavity inside the cavity baffle 5 can also play a role in stabilizing flow and buffering, which helps to reduce the pulsation of the fluid in the pipe side, thereby reducing the intensity of hydrodynamic noise.

[0051] The interior of a single cavity baffle 5 is hollow, and the second mounting holes 7 on the two semicircular surfaces of the same cavity baffle 5 are staggered. Heat exchange tubes installed on the same cavity baffle 5 share the fluid space within the cavity baffle 5. The staggered installation of the heat exchange tubes on both sides of the cavity baffle 5 increases sound reflection, thereby improving the sound absorption effect.

[0052] The structure of the heat exchange assembly 6 is: including a first heat exchange tube group 601, a second heat exchange tube group 602, a third heat exchange tube group 603 and a fourth heat exchange tube group 604, the first heat exchange tube group 601 and the second heat exchange tube group 602 are used to connect the sealing plate 2 and the cavity baffle 5, the third heat exchange tube group 603 and the fourth heat exchange tube group 604 are used to connect the two cavity baffles 5, the first heat exchange tube group 601, the second heat exchange tube group 602, the third heat exchange tube group 603 and the fourth heat exchange tube group 604 are symmetrical about the center of the heat exchange assembly 6; the connection length of the second heat exchange tube group 602 is longer than the connection length of the first heat exchange tube assembly 601, and the connection length of the fourth heat exchange tube group 604 is longer than the connection length of the third heat exchange tube assembly 603.

[0053] Corresponding to the second mounting holes 7 on the cavity baffle 5, there are six second mounting holes 7 on one end surface of a single cavity baffle 5, divided into two rows, three in each row; each heat exchange tube group consists of three heat exchange tubes;

[0054] When installing the heat exchange assembly 6, first, two groups of first heat exchange tube groups 601 are used to connect the six first mounting holes 4 on the sealing plate 2 and the six second mounting holes 7 on the front end surface of the first cavity baffle 5; then, there are three first mounting holes 4 left on the sealing plate 2, which are connected to the three second mounting holes 7 on the front end surface of the second cavity baffle 5 by a group of second heat exchange tube groups 602; the three second mounting holes 7 on the rear end surface of the first cavity baffle 5 are connected to the three second mounting holes 7 on the front end surface of the third cavity baffle 5 by a group of fourth heat exchange tube groups 604; the three second mounting holes 7 on the rear end surface of the first cavity baffle 5 are connected to the three second mounting holes 7 on the front end surface of the second cavity baffle 5 by a group of third heat exchange tube groups 603; the three second mounting holes 7 on the rear end surface of the second cavity baffle 5 are connected to the three second mounting holes 7 on the front end surface of the second cavity baffle 5 by a group of third heat exchange tube groups 60 3 is connected to the three second mounting holes 7 on the front end surface of the third cavity baffle 5; the three second mounting holes 7 on the rear end surface of the second cavity baffle 5 are connected to the three second mounting holes 7 on the front end surface of the fourth cavity baffle 5 by a group of fourth heat exchange tube groups 604; the three second mounting holes 7 on the rear end surface of the third cavity baffle 5 are connected to the three second mounting holes 7 on the front end surface of the fourth cavity baffle 5 by a group of third heat exchange tube groups 603; the three second mounting holes 7 on the rear end surface of the third cavity baffle 5 are connected to the three first mounting holes 4 on the other sealing plate 2 by a group of second heat exchange tube groups 602; the six second mounting holes 7 on the rear end surface of the fourth cavity baffle 5 are connected to the six first mounting holes 4 on the other sealing plate 2 by two groups of first heat exchange tube groups 601; thereby completing the installation of the heat exchange assembly 6.

[0055] Each sound absorber 12 has several evenly spaced guide grooves 1201 on its surface and several evenly spaced hollow, spherical sound absorption cavities 1202 inside. The guide grooves 1201 have a V-shaped cross-section. The sound absorber 12 is made of rubber. It absorbs sound and forms a resistive sound-absorbing structure.

[0056] The guide grooves 1201 on the sound absorbing body 12 have a guiding function, which can smooth the flow field and reduce the pulsation intensity of the fluid in the pipe side.

[0057] The sound-absorbing cavity 1202 reflects sound waves, thereby increasing the propagation distance of the sound waves and improving the dissipation effect of noise energy. At the same time, the sound-absorbing body 12 is provided with the sound-absorbing cavity 1202, and forms a mass-spring system with its own rubber material. When excited by sound waves, it causes resonance, realizes mode conversion, and converts longitudinal waves into transverse waves, thereby increasing the loss effect of the rubber material on noise energy.

[0058] The sidewall of the shell 1 is provided with a first inlet 8 and a first outlet 9. Both heads 3 are provided with openings for the inflow or outflow of tube-side fluid. The opening on one head 3 is a second inlet 10, and the opening on the other head 3 is a second outlet 11. The first inlet 8 is for the shell-side fluid to flow into the interior of the shell 1, and the first outlet 9 is for the shell-side fluid to flow out of the interior of the shell 1. The second inlet 10 is for the tube-side fluid to flow into the interior of the heat exchange component 6, and the second outlet 11 is for the tube-side fluid to flow out of the interior of the heat exchange component 6. The first inlet 8 and first outlet 9 are provided at opposite ends of the outer wall of the shell 1. The second inlet 10 is provided in the middle of the head 3 near the first outlet 9, and the second outlet 11 is provided in the middle of the head 3 near the first inlet 8. This arrangement increases heat exchange between the shell-side and tube-side fluids, ensuring heat exchange efficiency.

[0059] The second inlet 10, the head 3, the cavity baffle 5, the heat exchange component 6 and the second outlet 11 constitute a resistive silencer structure with sudden impedance change. When the tube-side fluid flows from the second inlet 10 into the interior of the head 3, the flow cross-sectional area becomes larger; when the tube-side fluid flows from the interior of the head 3 into a single heat exchange tube, the flow cross-sectional area becomes smaller; when the tube-side fluid flows from a single heat exchange tube into the interior of the cavity baffle 5, the flow cross-sectional area becomes larger; when the tube-side fluid flows from the cavity baffle 5 into a single heat exchange tube, the flow cross-sectional area becomes smaller; when the tube-side fluid flows from a single heat exchange tube into the interior of the head 3, the flow cross-sectional area becomes larger; when the tube-side fluid flows from the interior of the head 3 into the second outlet 11, the flow cross-sectional area becomes smaller.

[0060] The working process of the present invention is as follows:

[0061] The tube-side fluid is cooling water, usually seawater, and the shell-side fluid is the hot fluid to be exchanged;

[0062] The shell-side fluid flows into the interior of the shell 1 through the first inlet 8 and flows out of the interior of the shell 1 through the first outlet 9;

[0063] The tube-side fluid flows into the interior of the head 3 at one end through the second inlet 10. The guide groove 1201 guides the tube-side fluid, reducing the pulsation intensity of the tube-side fluid. The tube-side fluid then flows into the interior of the heat exchange component 6 through the first mounting hole 4 on the sealing plate 2. The individual heat exchange tubes in the heat exchange component 6 are connected to the cavity baffle 5 through the second mounting hole 7. The tube-side fluid flows from one section of the heat exchange tube into the cavity baffle 5, then into the next section of the heat exchange tube, and finally into the interior of the head 3 at the other end, and flows out through the second outlet 11.

[0064] The heat exchange between the shell-side fluid and the tube-side fluid is completed, and during the fluid flow process, the sound absorber 12 and the cavity baffle 5 attenuate the water sound generated in the upstream pipeline and inside the heat exchanger, so that the ship equipped with the intra-cavity silencer heat exchanger meets the acoustic stealth performance requirements.

[0065] The present invention utilizes the structural characteristics of the heat exchanger to tap its noise reduction potential, combines the advantages of resistive sound absorption and reactive sound reduction, and fully utilizes the cavity areas at both ends of the pipe to absorb sound and achieve resistive sound reduction; proposes a common cavity sound reduction method for the heat exchange component 6 to achieve reactive sound reduction, thereby achieving the broadband noise control effect of the intra-cavity sound-reducing heat exchanger; the present invention fully utilizes the structural characteristics of the shell and tube heat exchanger itself, and can achieve pipeline sound radiation control without adding additional vibration reduction and sound reduction components, solving the problem of being unable to install a silencer due to limited space on the ship.

[0066] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. An intracavity muffler heat exchanger, characterized in that: The invention comprises a hollow thin-walled shell (1), wherein two ends of the shell (1) are symmetrically provided with hemispherical heads (3), the inner surface of each head (3) is covered with a sound absorbing body (12) for sound absorption, and a sealing plate (2) is provided at the open portion of each head (3) to isolate the inner space of the head (3) from the inner space of the shell (1), and a plurality of first mounting holes (4) are provided on the sealing plate (2). A heat exchange component (6) is installed between the two sealing plates (2), and the heat exchange component (6) is formed by splicing a plurality of heat exchange tube groups in the length direction. A plurality of cavity baffles (5) are evenly installed between the outer wall of the heat exchange component (6) and the inner wall of the shell (1), and each cavity baffle (5) is semi-disc-shaped and has a cavity therein. A plurality of second mounting holes (7) are respectively provided on the two semi-circular surfaces of a single cavity baffle (5), and the heat exchange component (6) is installed in cooperation with the cavity baffle (5) through the second mounting holes (7); A plurality of guide grooves (1201) are evenly arranged on the surface of a single sound absorbing body (12), and a plurality of hollow, spherical sound absorbing cavities (1202) are evenly arranged inside the single sound absorbing body (12).

2. The intracavity muffler heat exchanger according to claim 1, characterized in that: The interior of a single cavity baffle (5) is a hollow structure, and the second mounting holes (7) on the two semicircular surfaces of the same cavity baffle (5) are arranged in a staggered manner.

3. The intracavity muffler heat exchanger according to claim 1, characterized in that: The heat exchange tubes installed on the same cavity baffle (5) share the fluid space inside the cavity baffle (5).

4. The intracavity muffler heat exchanger according to claim 1, characterized in that: The structure of the heat exchange assembly (6) is as follows: it comprises a first heat exchange tube group (601), a second heat exchange tube group (602), a third heat exchange tube group (603) and a fourth heat exchange tube group (604); the first heat exchange tube group (601) and the second heat exchange tube group (602) are used to connect the sealing plate (2) and the cavity baffle (5); the third heat exchange tube group (603) and the fourth heat exchange tube group (604) are used to connect the two cavity baffles (5); and the first heat exchange tube group (601), the second heat exchange tube group (602), the third heat exchange tube group (603) and the fourth heat exchange tube group (604) are symmetrical about the center of the heat exchange assembly (6).

5. The intracavity muffler heat exchanger according to claim 4, characterized in that: The connection length of the second heat exchange tube group (602) is longer than the connection length of the first heat exchange tube group (601), and the connection length of the fourth heat exchange tube group (604) is longer than the connection length of the third heat exchange tube group (603).

6. The intracavity muffler heat exchanger according to claim 1, characterized in that: The cross section of the guide groove (1201) is a V-shaped structure.

7. The intracavity muffler heat exchanger according to claim 1, characterized in that: The sound absorbing body (12) is made of rubber.

8. The intracavity muffler heat exchanger according to claim 1, characterized in that: A first inlet (8) and a first outlet (9) are provided on the side wall of the housing (1).

9. The intracavity muffler heat exchanger according to claim 1, characterized in that: The two seal heads (3) are provided with openings for the pipe-side fluid to flow in or out, the opening on one seal head (3) being the second inlet (10), and the opening on the other seal head (3) being the second outlet (11).

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