A silent diesel engine

Abstract

This invention discloses a silent diesel engine, belonging to the field of engine equipment. The device includes a protective box and an engine body. The engine body is equipped with a water tank and an exhaust pipe. Connecting pipes are fixedly connected to both sides of the protective box. A cooling fan is installed inside one set of the connecting pipes. Multiple sets of sound-absorbing cotton panels are arranged alternately inside the connecting pipes. Multiple sets of dampers are fixedly connected to the bottom inner wall of the protective box. A mounting plate is fixedly connected to the top of the damper. A buffer spring is sleeved on the outer wall of the damper. A water tank and a water pump are fixedly connected to the side wall of the protective box. The input end of the water pump is connected to the inside of the water tank. By setting multiple sets of alternately arranged sound-absorbing cotton panels inside the connecting pipes, sound is absorbed in multiple stages through the cavities inside the sound-absorbing cotton panels as it passes between them, reducing the sound transmission from inside the connecting pipes.

Description

Technical Field

[0001] This invention relates to the field of engine equipment technology, and more specifically to a quiet diesel engine. Background Technology

[0002] Diesel engines are engines that burn diesel fuel to obtain energy. They have the advantages of high torque and good economic performance. Due to the strong power generated by their high torque, diesel engines will produce more noise and vibration when they are working, which will affect the user experience. At the same time, diesel engine sets will generate a lot of heat when they are working. If they are not cooled in time, they can easily burn out the diesel engine set.

[0003] Current methods for reducing engine noise typically involve adding a sound-isolating protective cover to the outside of the engine. However, the use of such covers presents several problems: First, while a fully sealed cover provides good noise reduction, it fails to cool the engine, potentially causing damage over time. Furthermore, if ventilation openings are provided on the cover, noise can escape through these openings, reducing the noise reduction effect. Therefore, engine noise reduction and heat dissipation are mutually dependent. Second, with the engine housed inside the cover, the exhaust pipe must extend from within it. If the exhaust pipe is connected to the cover, the vibrations generated during exhaust will cause the cover to vibrate, generating even more noise. Additionally, if there is a gap between the exhaust pipe and the cover, the exhaust pipe will collide with the cover during vibration, also causing vibration. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a quiet diesel engine to solve the problems of heat dissipation and exhaust noise caused by the use of protective covers for noise reduction in the prior art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A silent diesel engine includes a protective box and an engine body. The engine body is equipped with a water tank and an exhaust pipe. Connecting pipes are fixedly connected to both sides of the protective box. A cooling fan is installed inside one set of the connecting pipes. Multiple sets of sound-absorbing cotton panels are arranged alternately inside the connecting pipes. Multiple sets of dampers are fixedly connected to the bottom inner wall of the protective box. A mounting plate is fixedly connected to the top of the damper. A buffer spring is sleeved on the outer wall of the damper. A water tank and a water pump are fixedly connected to the side wall of the protective box. The input end of the water pump is connected to the inside of the water tank. The output end of the water pump is connected to the water tank through an inlet pipe. The water tank is connected to the bottom of the water tank through an outlet pipe.

[0007] As a further embodiment of the present invention: a fixing rod is fixedly connected to the inside of both sides of the protective box, a fixing plate is fixedly connected to both ends of the mounting plate, a sliding groove is opened inside the fixing plate, the fixing rod is slidably connected inside the sliding groove, and a vibration isolation spring is sleeved on the outer wall of the fixing rod, with the two ends of the vibration isolation spring abutting against the inside of the protective box and the side wall of the fixing plate, respectively.

[0008] As a further aspect of the present invention: sound-insulating cotton is fixedly connected to the inner wall of the protective box.

[0009] As a further embodiment of the present invention: a through groove is provided on the top of the protective box, the exhaust pipe passes through the through groove and extends to the outside of the protective box, an elastic sleeve is fixedly connected to the outer wall of the through groove, a heat dissipation ring is fixedly connected to the top of the elastic sleeve, and the heat dissipation ring is fixedly connected to the outer wall of the exhaust pipe.

[0010] As a further aspect of the present invention: a water supply pipe and a drain pipe are fixedly connected to both ends of the heat dissipation ring, the end of the water supply pipe away from the heat dissipation ring is connected to the output end of the water supply pump, and the drain pipe passes through the protective box and is connected to the water outlet pipe.

[0011] As a further aspect of the present invention: an airbag is provided on the inner wall of the bottom of the protective box, and the two ends of the airbag abut against the inner wall of the bottom of the protective box and the mounting plate, respectively. An air supply pipe is fixedly connected to one side of the airbag, and the end of the air supply pipe away from the airbag passes through the protective box and is connected to the water tank.

[0012] As a further aspect of the present invention: a partition is fixedly connected inside the water tank, a jet pipe is fixedly connected to one side of the partition, multiple sets of air outlet slots are opened at the top of the jet pipe, and the jet pipe is connected to the air supply pipe.

[0013] As a further embodiment of the present invention: a sliding sleeve is fixedly connected to one side of the water tank, the air supply pipe is connected to the sliding sleeve, a sliding rod is slidably connected inside the sliding sleeve, one end of the sliding rod passes through the sliding sleeve and is fixedly connected to a moving block, the moving block slides on both sides of the partition, and a return spring is sleeved on the outer wall of the sliding rod, the two ends of the return spring abutting against the sliding sleeve and the sliding rod respectively.

[0014] The beneficial effects of this invention are:

[0015] In this invention, by setting multiple sets of staggered sound-absorbing cotton boards inside the connecting pipe, the sound is absorbed in multiple stages through the cavities inside the sound-absorbing cotton boards as it passes between them, reducing the sound transmission from inside the connecting pipe. At the same time, by setting an elastic sleeve at the position where the exhaust pipe extends from inside the protective box and connecting it to the exhaust pipe, noise generated by the exhaust pipe contacting the protective box is avoided on the one hand, and noise from inside the protective box is also avoided on the other hand. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is the present invention. Figure 1 Enlarged structural diagram of section A;

[0019] Figure 3 This is the present invention. Figure 1 Enlarged structural diagram of section B;

[0020] Figure 4 This is a schematic diagram of the internal structure of the water tank in this invention;

[0021] Figure 5 This is a schematic diagram of the internal structure of the connecting pipe in this invention.

[0022] In the diagram: 1. Protective box; 101. Connecting pipe; 1011. Radiator fan; 102. Through groove; 103. Sound insulation cotton; 2. Engine body; 201. Water tank; 202. Exhaust pipe; 3. Sound-absorbing cotton board; 4. Fixing rod; 401. Fixing plate; 402. Vibration damping spring; 5. Damper; 501. Buffer spring; 502. Mounting plate; 6. Water tank; 601. Water supply pump; 6011. Water supply pipe; 6012. Drain pipe; 602. Water inlet pipe; 603. Water outlet pipe; 7. Elastic sleeve; 701. Radiator ring; 8. Partition plate; 801. Jet pipe; 8011. Air outlet groove; 802. Sliding sleeve; 8021. Sliding rod; 8022. Moving block; 8023. Return spring; 803. Airbag; 8031. Air supply pipe. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figures 1-5As shown, a quiet diesel engine includes a protective housing 1 and an engine body 2. The engine body 2 is equipped with a water tank 201 and an exhaust pipe 202. Sound insulation cotton 103 is fixedly connected to the inner wall of the protective housing 1, isolating most of the noise inside the protective housing 1. Connecting pipes 101 are fixedly connected to both sides of the protective housing 1. A cooling fan 1011 is installed inside one set of connecting pipes 101, drawing air out of the protective housing 1 and dissipating the heat generated by the engine body 2 during operation. Simultaneously, multiple sets of sound-absorbing cotton panels 3 are arranged alternately inside the connecting pipes 101, further reducing noise. When the noise is transmitted through the connecting pipe 101, the sound-absorbing cotton plates 3 arranged in an alternating manner fill the cavity, thereby solving the cavity resonance of the noise and absorbing high, medium and low frequency noise for noise reduction. Multiple sets of dampers 5 are fixedly connected to the bottom inner wall of the protective box 1. The top of the damper 5 is fixedly connected to the mounting plate 502. The outer wall of the damper 5 is fitted with a buffer spring 501. A water tank 6 and a water supply pump 601 are fixedly connected to the side wall of the protective box 1. The input end of the water supply pump 601 is connected to the inside of the water tank 6. The output end of the water supply pump 601 is connected to the water tank 201 through the water inlet pipe 602. The water tank 201 is connected to the bottom of the water tank 6 through the water outlet pipe 603.

[0025] like Figure 1 and Figure 3 As shown, the protective box 1 is fixedly connected to the inside of both sides with fixed rods 4, and the mounting plate 502 is fixedly connected to both ends with fixed plates 401. The fixed plates 401 have a sliding groove inside, and the fixed rods 4 are slidably connected inside the sliding groove. The outer wall of the fixed rods 4 is fitted with vibration damping springs 402, and the two ends of the vibration damping springs 402 abut against the inside of the protective box 1 and the side wall of the fixed plates 401, respectively. When the engine body 2 vibrates and causes the mounting plate 502 to shake, the vibration damping springs 402 buffer the vibration of the mounting plate 502 while isolating the resonance noise generated by the contact between the mounting plate 502 and the inner wall of the protective box 1, further reducing the noise transmission of the engine body 2.

[0026] like Figure 1 and Figure 2 As shown, the protective box 1 described above has a through groove 102 on its top for venting the exhaust pipe 202. The diameter of the through groove 102 is larger than the diameter of the exhaust pipe 202 to prevent the vibration generated by the exhaust pipe 202 from being transmitted to the protective box 1 and generating noise. At the same time, an elastic sleeve 7 is fixedly connected to the outer wall of the through groove 102, and a heat dissipation ring 701 is fixedly connected to the top of the elastic sleeve 7. The heat dissipation ring 701 is fixedly connected to the outer wall of the exhaust pipe 202 to seal the gap between the through groove 102 and the exhaust pipe 202, preventing the noise inside the protective box 1 from being transmitted through the gap.

[0027] like Figure 1As shown, the two ends of the heat dissipation ring 701 are respectively fixedly connected to a water supply pipe 6011 and a drain pipe 6012. The end of the water supply pipe 6011 away from the heat dissipation ring 701 is connected to the output end of the water supply pump 601. The drain pipe 6012 passes through the protective box 1 and is connected to the outlet pipe 603. A portion of the coolant pumped by the water supply pump 601 enters the heat dissipation ring 701 through the water supply pipe 6011, cooling the temperature transmitted from the exhaust pipe 202 to the heat dissipation ring 701 and preventing the high temperature of the exhaust pipe 202 from melting the elastic sleeve 7.

[0028] like Figure 1 As shown, an airbag 803 is provided on the inner wall of the bottom of the protective box 1. The two ends of the airbag 803 abut against the inner wall of the bottom of the protective box 1 and the mounting plate 502, respectively. The airbag 803 can buffer the vibration of the engine body 2 on the mounting plate 502. Simultaneously, an air supply pipe 8031 ​​is fixedly connected to one side of the airbag 803. The end of the air supply pipe 8031 ​​away from the airbag 803 passes through the protective box 1 and connects to the water tank 6, sending the compressed air from the airbag 803 during buffering into the water tank 6, causing the coolant inside the water tank 6 to bubble and dissipate heat. (e.g.) Figure 1 As shown, the airbag 803 is equipped with a one-way valve at both the air inlet and outlet ends for the air to enter and exit when the airbag 803 is compressed and reset.

[0029] like Figure 1 and Figure 4 As shown, in order to improve the bubbling effect inside the water tank 6, a partition 8 is fixedly connected inside the water tank 6. The partition 8 divides the inside of the water tank 6 into an inlet chamber and an outlet chamber. A jet pipe 801 is fixedly connected to one side of the outlet chamber of the partition 8. Multiple sets of air outlet slots 8011 are opened at the top of the jet pipe 801. The jet pipe 801 is connected to the air supply pipe 8031. When the engine body 2 vibrates and drives the mounting plate 502 to move downward, it compresses the air bag 803. The air inside the air bag 803 enters the jet pipe 801 through the air supply pipe 8031, and then is sprayed into the coolant inside the water tank 6 through the air outlet slots 8011, causing bubbles to be generated inside the coolant. The bubbles carry the heat in the coolant to the top of the coolant for heat dissipation, thereby improving the efficiency of coolant heat dissipation.

[0030] like Figure 1 and Figure 4As shown, to improve the bubbling effect inside the water tank 6, a sliding sleeve 802 is fixedly connected to one side of the water tank 6 located in the outlet chamber. Simultaneously, an air supply pipe 8031 ​​is connected to the sliding sleeve 802 for air supply. A sliding rod 8021 is slidably connected inside the sliding sleeve 802. The air supplied by the air supply pipe 8031 ​​to the sliding sleeve 802 pushes the sliding rod 8021 to move. One end of the sliding rod 8021 passes through the sliding sleeve 802 and is fixedly connected to a moving block 8022. The moving block 8022 slides on both sides of the partition 8, and the sliding rod 8021 drives the moving block 802. 2. Move the moving block 8022 from the outlet chamber to the inlet chamber. The volume of the inlet chamber decreases and the water level rises. The coolant in the inlet chamber overflows from the partition 8 into the outlet chamber. The coolant cools down while flowing, further improving the efficiency of coolant heat dissipation. At the same time, a return spring 8023 is sleeved on the outer wall of the slide rod 8021. The two ends of the return spring 8023 abut against the slide sleeve 802 and the slide rod 8021 respectively. When the airbag 803 resets, the return spring 8023 drives the moving block 8022 on the slide rod 8021 to reset.

[0031] The working principle of this invention is as follows: When in use, the user fixes the engine body 2 to the mounting plate 502 inside the protective box 1. The exhaust pipe 202 on the engine body 2 passes through the through groove 102 on the protective box 1 and is connected to the outer wall of the exhaust pipe 202 through the heat dissipation ring 701. When the engine body 2 is started, the noise generated by the engine body 2 is initially absorbed by the sound insulation cotton 103 inside the protective box 1. Then, the noise at the ventilation point of the protective box 1 is further reduced by the sound-absorbing cotton plate 3 inside the connecting pipe 101. Then, the noise at the exhaust pipe 202 at the top of the protective box 1 is isolated by the elastic sleeve 7. At the same time, when the engine body 2 vibrates, the vibration of the engine body 2 is buffered by the buffer spring 501 at the bottom of the mounting plate 502, and then the damper 5 reduces the vibration. To reduce the vibration noise generated by the engine body 2 during operation, the mounting plate 502 is connected to the inner wall of the protective box 1 on both sides by fixing rods 4 and vibration isolation springs 402. When the engine body 2 vibrates and causes the mounting plate 502 to shake, the vibration isolation springs 402 buffer the vibration of the mounting plate 502 and isolate the resonance noise generated by the contact between the mounting plate 502 and the inner wall of the protective box 1, further reducing the noise transmission of the engine body 2. At the same time, the cooling fan 1011 and the water supply pump 601 are started. The water supply pump 601 draws coolant from the water tank 6 and then sends it into the water tank 201 on the engine body 2 through the water inlet pipe 602 to absorb the heat generated by the engine body 2 during operation. Then, it is sent into the water tank 6 through the water outlet pipe 603 for cooling and then circulated to improve the cooling effect of the engine body 2.

[0032] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A silent diesel engine, comprising a protective casing (1) and an engine body (2), wherein the engine body (2) is provided with a water tank (201) and an exhaust pipe (202), characterized in that, The protective box (1) is fixedly connected to the two sides by connecting pipes (101). A set of connecting pipes (101) is equipped with a cooling fan (1011). Multiple sets of sound-absorbing cotton boards (3) are arranged alternately inside the connecting pipes (101). Multiple sets of dampers (5) are fixedly connected to the bottom inner wall of the protective box (1). A mounting plate (502) is fixedly connected to the top of the damper (5). A buffer spring (501) is sleeved on the outer wall of the damper (5). The protective box (1) has a water tank (6) and a water supply pump (601) fixedly connected to its side wall. The input end of the water supply pump (601) is connected to the inside of the water tank (6), and the output end of the water supply pump (601) is connected to the water tank (201) through the water inlet pipe (602). The water tank (201) is connected to the bottom of the water tank (6) through the water outlet pipe (603). An airbag (803) is provided on the bottom inner wall of the protective box (1). The two ends of the airbag (803) abut against the bottom inner wall of the protective box (1) and the mounting plate (502) respectively. An air supply pipe (8031) is fixedly connected to one side of the airbag (803). The end of the air supply pipe (8031) away from the airbag (803) passes through the protective box (1) and is connected to the water tank (6). A partition (8) is fixedly connected inside the water tank (6). A jet pipe (801) is fixedly connected to one side of the partition (8). Multiple sets of air outlet slots (8011) are opened at the top of the jet pipe (801). The water tank (6) is connected to the air supply pipe (8031). A sliding sleeve (802) is fixedly connected to one side of the water tank (6). The air supply pipe (8031) is connected to the sliding sleeve (802). A sliding rod (8021) is slidably connected inside the sliding sleeve (802). One end of the sliding rod (8021) passes through the sliding sleeve (802) and is fixedly connected to a moving block (8022). The moving block (8022) slides on both sides of the partition (8). A return spring (8023) is sleeved on the outer wall of the sliding rod (8021). The two ends of the return spring (8023) abut against the sliding sleeve (802) and the sliding rod (8021) respectively.

2. A silent diesel engine according to claim 1, characterized in that, The protective box (1) has fixed rods (4) fixedly connected inside both sides. The mounting plate (502) has fixed plates (401) fixedly connected at both ends. The fixed plate (401) has a sliding groove inside. The fixed rods (4) are slidably connected inside the sliding groove. The outer wall of the fixed rods (4) is fitted with vibration isolation springs (402). The two ends of the vibration isolation springs (402) abut against the inside of the protective box (1) and the side wall of the fixed plate (401) respectively.

3. A silent diesel engine according to claim 1, characterized in that, The inner wall of the protective box (1) is fixedly connected with sound insulation cotton (103).

4. A silent diesel engine according to claim 1, characterized in that, The protective box (1) has a through groove (102) on the top. The exhaust pipe (202) passes through the through groove (102) and extends to the outside of the protective box (1). An elastic sleeve (7) is fixedly connected to the outer wall of the through groove (102). A heat dissipation ring (701) is fixedly connected to the top of the elastic sleeve (7). The heat dissipation ring (701) is fixedly connected to the outer wall of the exhaust pipe (202).

5. A silent diesel engine according to claim 4, characterized in that, The two ends of the heat dissipation ring (701) are respectively fixedly connected to a water supply pipe (6011) and a drain pipe (6012). The end of the water supply pipe (6011) away from the heat dissipation ring (701) is connected to the output end of the water supply pump (601). The drain pipe (6012) passes through the protective box (1) and is connected to the water outlet pipe (603).

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