Noise reduction device for relay valve of brake

Abstract

The utility model relates to the technical field of internal combustion locomotives, in particular to a noise reduction device for a relay valve of a brake. An inner-layer silencing box body is arranged in the outer-layer silencing box body, an air layer is arranged between the outer-layer silencing box body and the inner-layer silencing box body, and micropores are formed in the same positions of the outer-layer silencing box body and the inner-layer silencing box body. The noise reduction device for the relay valve of the brake covers the relay valve, noise generated when the relay valve exhausts air is reduced through the outer-layer noise reduction box body, the inner-layer noise reduction box body and the air layer, and then the air is exhausted through the micropores.

Description

Technical Field

[0001] The utility model relates to the technical field of internal combustion locomotives. Background Art

[0002] The DF4C diesel locomotive will generate huge noise during the brake test after starting, the simple test after trailering, the braking and deceleration during operation, and the through test. As a result, the locomotive crew cannot hear the commands clearly during the vehicle-machine joint control, the station and train dispatchers cannot hear the replies clearly, and the operations such as the engine crew's call and response will also be affected. It will also cause damage to the locomotive crew's hearing and affect their health.

[0003] Investigations revealed the source of the noise to be the relay valve on the JZ-7 brake motor used on the DF4C diesel locomotive. The locomotive's self-valve reduces pressure, allowing the train pipe pressure to be discharged through the JZ-7 brake motor's relay valve exhaust port. However, the exhaust port was too small and the exhaust volume was too large, resulting in excessive air pressure and the resulting loud noise. Utility Model Content

[0004] In order to solve the technical problem in the prior art that a diesel locomotive generates huge noise during operation, the utility model provides a brake relay valve noise reduction device.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0006] A brake relay valve noise reduction device, an inner silencer box 9 is provided in an outer silencer box 1, an air layer is provided between the outer silencer box 1 and the inner silencer box 9, and microholes 2 are provided at corresponding positions on the outer silencer box 1 and the inner silencer box 9.

[0007] The outer sound-absorbing box body 1 and the inner sound-absorbing box body 9 are both cubic structures without a bottom surface. A first rectangular notch 4 is provided on the first side wall 3 of the outer sound-absorbing box body 1, and a second rectangular notch 10 is provided on the inner sound-absorbing box body 9 corresponding to the first rectangular notch 4. The first side wall 3 of the outer sound-absorbing box body 1 is provided with a first extension rod 5 extending downward on both sides of the rectangular notch 4, and a third extension rod 11 is provided on the inner sound-absorbing box body 9 corresponding to the first extension rod 5. The second side wall 7 and the third side wall 8 of the outer sound-absorbing box body 1 adjacent to the first side wall 3 are provided with a second extension rod 6 extending downward and connected to the side edge of the first extension rod 5, and the inner sound-absorbing box body 9 is provided with a fourth extension rod 12 corresponding to the second extension rod 6.

[0008] The air layer is filled with felt or rubber sound insulation cotton.

[0009] The perforation rate of the micropores 2 on the outer layer sound-absorbing box body 1 and the inner layer sound-absorbing box body 9 is 1%-5%.

[0010] The wall thickness of the outer sound-absorbing box 1 and the inner sound-absorbing box 9 is 0.9 mm.

[0011] The diameter of the micropores 2 is 2 cm, and the interval between the micropores 2 is 2 cm.

[0012] The outer sound-absorbing box body 1 is 24 cm long, 22 cm wide and 24 cm high, and the inner sound-absorbing box body 9 is 21 cm long, 16 cm wide and 20 cm high.

[0013] The first rectangular notch 4 has a height of 16 cm and a width of 9 cm, and the first extension rod 5 and the second extension rod 6 have a height of 12 cm.

[0014] The thickness of the felt or rubber sound insulation cotton is 3 cm.

[0015] The advantages of this utility model compared with the prior art are:

[0016] By covering the relay valve with a brake relay valve noise reduction device, the noise generated by the air discharged from the relay valve is reduced through the outer silencer box, the inner silencer box and the air layer, and then the air is discharged through the micropores. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of a brake relay valve noise reduction device according to the utility model.

[0018] Figure 2 It is a left side view of a brake relay valve noise reduction device of the utility model.

[0019] Figure 3 It is a right side view of a brake relay valve noise reduction device of the utility model.

[0020] Figure 4 It is a rear view of a brake relay valve noise reduction device according to the utility model.

[0021] Figure 5 It is a top view of a brake relay valve noise reduction device of the utility model.

[0022] Figure 6 This is a front view of the inner layer of a brake relay valve noise reduction device of the utility model.

[0023] Figure 7 This is a rear view of the inner layer of a brake relay valve noise reduction device of the utility model.

[0024] Figure 8 It is a top view of the inner layer of a brake relay valve noise reduction device of the utility model.

[0025] Figure 9 The utility model is a side view of the inner layer of a brake relay valve noise reduction device.

[0026] Figure 10 The utility model is a perspective view of a brake relay valve noise reduction device.

[0027] In the figure: 1. Outer sound-absorbing box; 2. Micropores; 3. First side wall; 4. First rectangular notch; 5. First extension rod; 6. Second extension rod; 7. Second side wall; 8. Third side wall; 9. Inner sound-absorbing box; 10. Second rectangular notch; 11. Third extension rod; 12. Fourth extension rod. DETAILED DESCRIPTION

[0028] The utility model provides a brake relay valve noise reduction device such as Figure 1-10 As shown, an inner sound-absorbing housing 9 is provided within an outer sound-absorbing housing 1, with an air layer between the outer and inner sound-absorbing housings 1 and 9. Microholes 2 are provided at the same position on the outer and inner sound-absorbing housings 1 and 9. Both the outer and inner sound-absorbing housings 1 and 9 are cubic structures without a bottom surface. A first rectangular notch 4 is provided on the first side wall 3 of the outer sound-absorbing housing 1, and a second rectangular notch 10 is provided on the inner sound-absorbing housing 9 corresponding to the first rectangular notch 4. First extension rods 5 extending downwardly are provided on both sides of the first side wall 3 of the outer sound-absorbing housing 1, and third extension rods 11 are provided on the inner sound-absorbing housing 9 corresponding to the first extension rods 5. Second extension rods 6 extending downwardly and connected to the side edges of the first extension rods 5 are provided on the second and third side walls 7 and 8 of the outer sound-absorbing housing 1 adjacent to the first side wall 3. A fourth extension rod 12 is provided on the inner sound-absorbing housing 9 corresponding to the second extension rod 6. The outer silencer box 1 and the inner silencer box 9 can be made of common metal materials such as aluminum alloy, stainless steel, iron, etc. Stainless steel can be selected based on stability, environmental protection and economy. The silencer box can be installed at the relay valve in a nested manner, and screw holes can be extended from the box body to fasten it. In addition, the box body has a large volume and has enough space to relieve the impact of air pressure, which is very stable. Since the metal plate is conductive, it can be coated with an insulating layer to prevent conductivity. The silencer box is easy to disassemble using a nested installation, which is convenient for staff to inspect and repair; the micropores with a diameter of 2 cm on the two metal plates of the box body are also easy to manufacture, the process is simple, and economic costs are saved.

[0029] The wall thickness of the outer sound-absorbing box body 1 and the inner sound-absorbing box body 9 is 0.9 mm. The perforation rate of the micropores 2 on the outer sound-absorbing box body 1 and the inner sound-absorbing box body (9) is 1%-5%. The aperture of the micropores 2 is 2 cm, and the interval between the micropores 2 is 2 cm. The length of the outer sound-absorbing box body 1 is 24 cm, the width is 22 cm, and the height is 24 cm. The length of the inner sound-absorbing box body 9 is 21 cm, the width is 16 cm, and the height is 20 cm. The height of the rectangular notch 4 is 16 cm and the width is 9 cm. The height of the first extension rod 5 and the second extension rod 6 is 12 cm. When the air is discharged through the exhaust port of the relay valve, the air pressure, flow rate, flow velocity and air flow direction are uncertain. The sound-absorbing box will not rectify the air, and there is enough space for the air to be discharged, which can meet the requirements of not affecting the exhaust efficiency.

[0030] The air layer is filled with sound-absorbing materials such as felt or rubber sound insulation cotton. The thickness of the felt or rubber sound insulation cotton is 3 cm.

[0031] The relationship between decompression volume and exhaust time, taking DF4C locomotive as an example, the locomotive decompression volume and exhaust time are shown in the following table:

[0032]

[0033] Table DF4C locomotive pressure reduction and exhaust time comparison table

[0034] By dividing the exhaust time by the decompression amount to see the proportional relationship, it can be calculated that the ratio of decompression amount to exhaust time is almost 1:0.01.

[0035] The relay valve body is completely covered by the outer silencer box and the inner silencer box 9, and the outer silencer box, the inner silencer box (9), the air layer and the micropores constitute a microporous sound absorption structure. The air discharged from the exhaust port of the relay valve has a high pressure and a high flow rate, which produces a huge noise, and the micropores have a great influence on flow control and noise reduction. A non-sealed double-layer micro-perforated plate sound absorption structure is adopted and filled with sound-absorbing materials to achieve the purpose of further noise reduction and silencing. Since there are other equipment around the relay valve, the air layer is relatively thin. The double-layer micro-perforated plate structure and the sound-absorbing materials are used to reduce the noise and the micropores are used to discharge the air.

[0036] The present invention is described by way of examples. Those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be within the scope of protection of the present invention.

Claims

1. A brake relay valve noise reduction device, characterized in that: An inner layer sound-absorbing box body (9) is provided inside the outer layer sound-absorbing box body (1), an air layer is provided between the outer layer sound-absorbing box body (1) and the inner layer sound-absorbing box body (9), and micro holes (2) are provided at corresponding positions on the outer layer sound-absorbing box body (1) and the inner layer sound-absorbing box body (9); The outer sound-absorbing box (1) and the inner sound-absorbing box (9) are both cubic structures without a bottom surface. A first rectangular notch (4) is provided on the first side wall (3) of the outer sound-absorbing box (1), and a second rectangular notch (10) is provided on the inner sound-absorbing box (9) corresponding to the first rectangular notch (4). The first side wall (3) of the outer sound-absorbing box (1) is provided with a first extension rod (5) extending downward on both sides of the rectangular notch (4). The inner sound-absorbing box (9) is provided with a third extension rod (11) corresponding to the first extension rod (5). A second extension rod (6) extending downward and connected to the side edge of the first extension rod (5) is provided on the second side wall (7) and the third side wall (8) of the outer sound-absorbing box (1). A fourth extension rod (12) is provided on the inner sound-absorbing box (9) corresponding to the second extension rod (6).

2. A brake relay valve noise reduction device according to claim 1, characterized in that: The air layer is filled with felt or rubber sound insulation cotton.

3. The brake relay valve noise reduction device according to claim 1, characterized in that: The perforation rate of the micropores (2) on the outer layer sound-absorbing box body (1) and the inner layer sound-absorbing box body (9) is 1%-5%.

4. The brake relay valve noise reduction device according to claim 1, characterized in that: The wall thickness of the outer layer sound-absorbing box body (1) and the inner layer sound-absorbing box body (9) is 0.9 mm.

5. The brake relay valve noise reduction device according to claim 1, characterized in that: The micropores (2) have a pore diameter of 2 cm, and the intervals between the micropores (2) are 2 cm.

6. The brake relay valve noise reduction device according to claim 1, characterized in that: The outer sound-absorbing box (1) has a length of 24 cm, a width of 22 cm, and a height of 24 cm, and the inner sound-absorbing box (9) has a length of 21 cm, a width of 16 cm, and a height of 20 cm.

7. The brake relay valve noise reduction device according to claim 1, characterized in that: The first rectangular notch (4) has a height of 16 cm and a width of 9 cm, and the first extension rod (5) and the second extension rod (6) have a height of 12 cm.

8. The brake relay valve noise reduction device according to claim 2, characterized in that: The thickness of the felt or rubber sound insulation cotton is 3 cm.

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