Special tool for measuring noise of marine diesel engine

Abstract

The utility model relates to the technical field of diesel engine performance measurement, and discloses a special tool for marine diesel engine noise measurement, which comprises a front pipe section, a middle pipe section arranged on the right side of the front pipe section, a rear pipe section arranged on the right side of the middle pipe section, and a sensor mounting groove arranged on the right side of the rear pipe section. And the first threaded ring is arranged in the inner cavity of the front pipe section. Adjacent pipe sections can be connected end to end with the maximum extension distance and can also be completely rotated into the previous pipe section, the sensor mounting groove is connected with the rear pipe section, the acoustic sensor can be directly pressed into the groove to be fixed, meanwhile, in consideration of the weight problem, all the pipe sections are made of carbon fiber materials, and the sensor mounting groove is made of rubber materials. In addition, the noise measurement sensors can be placed at all measurement points meeting the diesel engine noise measurement standard requirement, and the requirement for noise measurement submitted by a diesel engine rack is met.

Description

Technical Field

[0001] The utility model relates to the technical field of diesel engine performance measurement, in particular to a special tool for measuring noise of a marine diesel engine. Background Art

[0002] With the development of industry and the continuous improvement of environmental requirements, noise has become a major source of pollution. It is listed as one of the three major sources of pollution in the world today, along with air pollution and water pollution. Diesel engine noise is extremely harmful to itself. Huge noise and vibration will affect the service life of the diesel engine, shorten the service life of the control system and other electronic components, and affect their normal operation. Noise has many effects on the human body. The highest sound pressure that the human ear can tolerate is generally 120dB~125dB. When people work under strong noise for a long time, the inner ear sensory organs will be pathologically affected, which will also have a bad impact on other aspects of the body. For ships, the reduction of noise level means the improvement of concealment.

[0003] However, since the height of a diesel engine is generally 2.6 meters, the noise measurement point is required to be 1 meter away from the diesel engine reference body, that is, at a height of 3.6 meters. Due to the limitations of the diesel engine test bench layout, some noise measurement points are difficult to reach, resulting in the inability to reach the noise measurement points by handheld acoustic probes, and the noise measurement of the diesel engine is also inaccurate. Therefore, a special tooling for measuring the noise of a marine diesel engine is designed to meet the noise measurement requirements. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a special tooling for measuring noise of marine diesel engines, so as to solve the problem raised in the above background technology that some noise measurement points are difficult to reach due to the limitation of diesel engine test bench layout, resulting in inaccurate noise measurement of diesel engines.

[0006] (II) Technical solution

[0007] To achieve the above purpose, the utility model provides the following technical solution: a special tool for measuring noise of marine diesel engines, comprising:

[0008] A front pipe section, a middle pipe section is provided on the right side of the front pipe section, a rear pipe section is provided on the right side of the middle pipe section, and a sensor installation groove is provided on the right side of the rear pipe section;

[0009] A first thread ring is arranged in the inner cavity of the front pipe section, a first thread head is installed on the left side of the middle pipe section, and the first thread head is screwed into the inner cavity of the first thread ring;

[0010] A second thread ring is arranged on the right side of the inner cavity of the middle pipe section, and a second thread head is installed on the left side of the rear pipe section, and the second thread head is screwed into the inner cavity of the second thread ring;

[0011] The third thread ring is arranged on the right side of the inner cavity of the rear pipe section. The surface of the sensor installation groove is installed with a third thread head, and the third thread head is screwed into the inner cavity of the third thread ring. A rubber sleeve is installed on the right side of the sensor installation groove.

[0012] Preferably, the front pipe section is a hollow circular tube, the first thread circle is an internal thread, and the wall thickness of the first thread circle is the hollow pipe section.

[0013] Preferably, the middle pipe section is a hollow circular tube, the first thread head is an external thread, the second thread ring is an internal thread, and the inner diameter of the first thread ring is larger than the diameter of the first thread head, so as to facilitate the up and down movement of the middle pipe section.

[0014] Preferably, the rear pipe section is a hollow circular tube, the second thread head is an external thread for meshing and connecting with the second thread circle of the middle pipe section, and the third thread circle is an internal thread for connecting with the sensor mounting groove.

[0015] Preferably, the rubber sleeve is arc-shaped, and the third thread head is an external thread for connecting with the third thread ring of the rear pipe section.

[0016] Preferably, positioning plates are installed on the upper right side and the rear of the rubber sleeve, a positioning rod is screwed between the two positioning plates, and the inner walls of the front pipe section, the middle pipe section and the rear pipe section are installed with retaining edges. Rotating the positioning rod can drive the positioning plates to approach each other, thereby driving the rubber sleeve to squeeze the sensor, thereby improving the installation stability of the sensor.

[0017] Beneficial Effects

[0018] Compared with the prior art, the utility model provides a special tool for measuring noise of marine diesel engines, which has the following beneficial effects:

[0019] This special tooling for marine diesel engine noise measurement has adjacent pipe sections that can be connected end to end to have the maximum extension distance, and can also be completely rotated into the previous pipe section. The sensor mounting slot is connected to the rear pipe section, and the acoustic sensor can be directly pressed into the slot for fixation. Considering the weight issue, all pipe sections are made of carbon fiber and the sensor mounting slot is made of rubber, which makes it convenient for staff to operate the device and can place the noise measurement sensor at various measuring points required by the diesel engine noise measurement standard, meeting the needs of diesel engine test benches for submitting noise measurements and improving the accuracy of diesel engine noise measurements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 It is a cross-sectional structural schematic diagram of the front pipe section of the utility model;

[0022] Figure 3 It is a cross-sectional structural schematic diagram of the intermediate pipe section of the utility model;

[0023] Figure 4 It is a cross-sectional structural schematic diagram of the rear pipe section of the utility model;

[0024] Figure 5 It is a structural schematic diagram of the sensor installation slot of the utility model.

[0025] In the figure: 1, front pipe section; 2, middle pipe section; 3, rear pipe section; 4, sensor mounting groove; 5, first thread circle; 6, first thread head; 7, second thread circle; 8, second thread head; 9, third thread circle; 10, third thread head; 11, rubber sleeve; 12, positioning plate; 13, positioning rod; 14, stop edge. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] The utility model provides a technical solution, a special tool for measuring noise of marine diesel engines, please refer to Figure 1 , comprising a front pipe section 1, a middle pipe section 2 is provided on the right side of the front pipe section 1, a rear pipe section 3 is provided on the right side of the middle pipe section 2, and a sensor mounting groove 4 is provided on the right side of the rear pipe section 3;

[0028] See also Figure 2 The first thread ring 5 is arranged in the inner cavity of the front tube section 1, see Figure 3 A first thread head 6 is installed on the left side of the middle pipe section 2, and the first thread head 6 is screwed into the inner cavity of the first thread ring 5;

[0029] The second thread ring 7 is arranged on the right side of the inner cavity of the middle pipe section 2, see Figure 4 A second thread head 8 is installed on the left side of the rear pipe section 3, and the second thread head 8 is screwed into the inner cavity of the second thread ring 7;

[0030] The third thread ring 9 is arranged on the right side of the inner cavity of the rear tube section 3, see Figure 5A third thread head 10 is installed on the surface of the sensor installation groove 4, and the third thread head 10 is screwed into the inner cavity of the third thread ring 9. A rubber sleeve 11 is installed on the right side of the sensor installation groove 4;

[0031] Adjacent pipe sections can be connected end to end to have the maximum extension distance, and can also be completely rotated into the previous pipe section. The sensor installation slot 4 is connected to the rear pipe section 3, and the acoustic sensor can be directly pressed into the slot for fixing. At the same time, considering the weight problem, all pipe sections are made of carbon fiber material, and the sensor installation slot 4 is made of rubber material, so that the staff can operate the device conveniently, and the noise measurement sensor can be placed at each measurement point required by the diesel engine noise measurement standard, meeting the requirements of the diesel engine bench for submitting noise measurement, and improving the accuracy of the diesel engine noise measurement.

[0032] See also Figure 2 The length of the front pipe section 1 is 700 mm, the diameter of the front pipe section 1 is a hollow round pipe of 32 mm, the first thread circle 5 is an internal thread of M28 specification, the length of the first thread circle 5 is 30 mm, and the wall thickness of the first thread circle 5 is a hollow pipe section of 1.9 mm.

[0033] See also Figure 3 The length of the middle pipe section 2 is 750 mm, the diameter of the middle pipe section 2 is a hollow round tube of 24 mm, the first thread head 6 is an M28 external thread, the length of the first thread head 6 is 30 mm, the second thread circle 7 is an M20 internal thread, the length of the second thread circle 7 is 30 mm, and the inner diameter of the first thread circle 5 is larger than the diameter of the first thread head 6, which facilitates the up and down movement of the middle pipe section 2.

[0034] See also Figure 4 The length of the rear pipe section 3 is 800 mm, the diameter of the rear pipe section 3 is a hollow round tube of 17 mm, the second thread head 8 is an M20 specification external thread, used to engage with the second thread circle 7 of the middle pipe section 2, the length of the second thread head 8 is 30 mm, the third thread circle 9 is an M16 specification internal thread, the length of the third thread circle 9 is 15 mm, and is used to connect with the sensor mounting groove 4.

[0035] See also Figure 5 The arc diameter of the rubber sleeve 11 is 12 mm, the inner arc diameter of the rubber sleeve 11 is 10 mm, the third thread head 10 is an M16 specification external thread, the length of the third thread head 10 is 20 mm, and is used to connect with the third thread ring 9 of the rear pipe section 3.

[0036] Positioning plates 12 are installed on the upper right side and the rear of the rubber sleeve 11, and a positioning rod 13 is screwed between the two positioning plates 12. Figure 1The inner walls of the front pipe section 1, the middle pipe section 2 and the rear pipe section 3 are all installed with a blocking edge 14, which can block the first thread head 6, the second thread head 8 and the third thread head 10 to prevent the first thread head 6, the second thread head 8 and the third thread head 10 from being separated from the first thread circle 5, the second thread circle 7 and the third thread circle 9. The rotating positioning rod 13 can drive the positioning plate 12 to approach each other, thereby driving the rubber sleeve 11 to squeeze the sensor, thereby improving the installation stability of the sensor.

[0037] In the device, the first thread head 6 is firstly screwed into the inner cavity of the first thread ring 5, so that the front pipe section 1 can be connected with the middle pipe section 2, the second thread head 8 is screwed into the inner cavity of the second thread ring 7, so that the middle pipe section 2 can be connected with the rear pipe section 3, the third thread head 10 is screwed into the inner cavity of the third thread ring 9, so that the rear pipe section 3 can be connected with the sensor installation groove 4, and then the positioning rod 13 can be rotated to drive the positioning plate 12 to approach each other, thereby driving the rubber sleeve 11 to squeeze the sensor, thereby improving the installation stability of the sensor, and finally the adjacent pipe sections can be connected end to end with the maximum extension distance, and can also be completely rotated into the previous pipe section. The sensor installation groove 4 is connected with the rear pipe section 3, and the acoustic sensor can be directly pressed into the groove for fixing. At the same time, considering the weight problem, all pipe sections are made of carbon fiber material, and the sensor installation groove 4 is made of rubber material, so that it is convenient for the staff to operate the device, and the noise measurement sensor can be placed at each measuring point required by the diesel engine noise measurement standard, meeting the requirements of the diesel engine bench for submitting noise measurement, and improving the accuracy of the diesel engine noise measurement.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A special tool for measuring noise of marine diesel engines, characterized in that: include: A front pipe section (1), wherein a middle pipe section (2) is provided on the right side of the front pipe section (1), a rear pipe section (3) is provided on the right side of the middle pipe section (2), and a sensor installation groove (4) is provided on the right side of the rear pipe section (3); A first thread ring (5) is arranged in the inner cavity of the front pipe section (1); a first thread head (6) is installed on the left side of the middle pipe section (2); the first thread head (6) is screwed into the inner cavity of the first thread ring (5); A second thread ring (7) is arranged on the right side of the inner cavity of the middle pipe section (2), and a second thread head (8) is installed on the left side of the rear pipe section (3), and the second thread head (8) is screwed into the inner cavity of the second thread ring (7); The third thread ring (9) is arranged on the right side of the inner cavity of the rear pipe section (3); the surface of the sensor installation groove (4) is installed with a third thread head (10); the third thread head (10) is screwed into the inner cavity of the third thread ring (9); and the right side of the sensor installation groove (4) is installed with a rubber sleeve (11).

2. The special tool for measuring noise of marine diesel engines according to claim 1, characterized in that: The front pipe section (1) is a hollow circular pipe, and the first thread ring (5) is an internal thread.

3. The special tool for measuring noise of marine diesel engines according to claim 1, characterized in that: The intermediate pipe section (2) is also a hollow circular pipe, the first thread head (6) is an external thread, and the second thread ring (7) is an internal thread.

4. The special tool for measuring noise of marine diesel engines according to claim 1, characterized in that: The rear pipe section (3) is a hollow circular pipe, the second thread head (8) is an external thread, and the third thread circle (9) is an internal thread.

5. The special tool for measuring noise of marine diesel engines according to claim 1, characterized in that: The rubber sleeve (11) is arc-shaped, and the third thread head (10) is an external thread.

6. The special tool for measuring noise of marine diesel engines according to claim 1, characterized in that: Positioning plates (12) are installed on the upper right side and the rear of the rubber sleeve (11), a positioning rod (13) is screwed between the two positioning plates (12), and the inner walls of the front pipe section (1), the middle pipe section (2) and the rear pipe section (3) are all installed with retaining edges (14).

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