Helmholtz silencer tuning device capable of achieving dual adjustment of connecting pipe diameter and silencing volume

Abstract

The utility model discloses a tuning device for a Helmholtz silencer, which can realize double adjustment of a connecting pipe diameter and a silencing volume. The silencer comprises an upper shell, a lower shell and a silencer main flow channel. A piston mechanism is arranged in the upper shell and can move up and down, so that the volume of a silencing cavity of the silencer can be accurately and quantitatively adjusted, and the action frequency of the silencer can be adjusted through the size change of the volume of the silencing cavity; the bottom of the lower shell is communicated with the silencer main flow channel through a communicating hole, a cover plate is arranged above the communicating hole, and a plurality of connecting pipes with different diameters are uniformly distributed on the cover plate; the connecting pipes with different diameters can be moved to the position above the communicating hole by rotating the cover plate, so that the purpose of adjusting the diameter of the communicating pipe is achieved, and the acting frequency of the silencer is adjusted again by adjusting the diameter of the connecting pipe. The device provided by the utility model can greatly reduce the operation complexity of sample piece replacement in the tuning test process, improves the development and test efficiency of silencing products, and is suitable for the acoustic design development and test debugging work of a vehicle air inlet system.

Description

Technical Field

[0001] The utility model relates to the field of engine air intake, in particular to a Helmholtz muffler tuning device with dual adjustable connection pipe diameter and muffler volume, which is used for acoustic effect verification of engine air intake system. Background Art

[0002] During the design of the engine intake system, a variety of mufflers are usually designed in the intake system to reduce the noise generated during the operation of the engine. After the design of the muffler solution is completed, samples will be manufactured to test and verify the acoustic effect. Usually, multiple rounds of sample preparation are required for different development stages. The entire manufacturing cycle will be very long and the manufacturing cost will be very high. At the same time, in order to meet the coverage of a certain bandwidth of silencer frequencies during the test, multiple tuning samples need to be made for different action frequencies, and frequent replacement of samples during the tuning test will also be more troublesome.

[0003] CN211230581U discloses a muffler with adjustable flow rate, which includes a muffler cylinder, a left end plate and a right end plate of the cylinder are fixedly connected to the two ends of the muffler cylinder respectively, an air inlet pipe and an air outlet pipe are arranged on the cylinder wall of the muffler cylinder, a cylinder cavity partition is fixedly arranged in the cylinder cavity of the muffler cylinder, the cylinder cavity partition divides the muffler cylinder into a left expansion chamber and a right expansion chamber, a perforated tube is installed on the cylinder cavity partition, the left section of the perforated tube is located in the left expansion chamber, and the right section of the perforated tube is located in the right expansion chamber, a regulating sliding cup with a cup-shaped structure is slidably arranged in the cavity of the right section of the perforated tube, the cup mouth of the regulating sliding cup faces the left expansion chamber, and a regulating rod fixedly installed on the bottom of the regulating sliding cup is slidably supported on the right end plate of the cylinder and extends to the outside of the right end plate of the cylinder. The flow-adjustable muffler can adjust the flow rate of the exhaust flow area according to the engine speed and the exhaust pressure, and has a very high market value. However, the flow-adjustable muffler can only adjust the flow area of ​​the perforated tube of the cavity on one side, the adjustable range is small and the flow area after adjustment is unclear, so the application range is small and the adjustment is not convenient. Utility Model Content

[0004] In order to solve the problems in the prior art, the utility model proposes a Helmholtz muffler tuning device with dual adjustable connection pipe diameter and muffler volume. The device can only manufacture one adjustable sample according to specific needs during the verification process, and can quickly, accurately and conveniently adjust the connection pipe diameter, muffler cavity volume and action frequency, expand the working range of the muffler, lock the optimal design of the muffler, and achieve the development goal of saving sample manufacturing, test time and cost.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model first provides a Helmholtz muffler tuning device with dual adjustable connection pipe diameter and muffler volume, comprising an upper shell, a lower shell and a muffler main channel; the upper shell has a first cavity, the first cavity is a chamber with a constant diameter, the lower shell has a second cavity, and the first cavity and the second cavity are connected to form a muffler cavity; the first cavity is provided with a piston mechanism capable of changing the volume of the first cavity;

[0007] The lower shell is sealed and connected to the outer wall of the main channel of the muffler; a connecting hole for connecting to the second chamber is opened on the pipe wall of the main channel of the muffler; a cover plate is horizontally arranged in the second chamber, and the cover plate can rotate around its center. The cover plate covers the connecting hole, and a plurality of connecting pipes with different diameters are evenly distributed along the circumference; connecting pipes with different diameters can be connected to the connecting hole by rotating the cover plate.

[0008] According to a preferred embodiment of the utility model, a port sealing ring is provided on the outlet end of the communicating hole facing the second chamber, and the port sealing ring makes the outlet end of the communicating hole a horizontal port.

[0009] Furthermore, the cover plate is a circular cover plate, which tightly covers the horizontal port; a stud is provided on the pipe wall of the main channel of the muffler, the center of the circular cover plate is sleeved on the stud, and a fixing nut is provided on the stud to lock the rotation angle of the circular cover plate. The distance from the center of each connecting pipe on the circular cover plate to the center of the cover plate is equal to the distance from the center of the connecting hole on the main channel of the muffler to the center of the rotating shaft.

[0010] According to a preferred embodiment of the utility model, the piston mechanism includes a piston plate, a piston rod, a piston fixing nut, a spring and a piston sealing ring; wherein, the piston plate is arranged in the first cavity to divide the first cavity into two parts, and the piston sealing ring is arranged on a circle along the outer edge of the piston plate; one end of the piston rod is connected to the back side of the piston plate, and the other end extends out of the upper shell body, and the extended section is provided with an external thread and is sleeved with the piston fixing nut, and the spring is sleeved on the piston rod and is located between the back side of the piston plate and the inner wall surface of the upper shell body.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] (1) The device provided by the utility model has a piston in its upper shell that can move up and down to accurately and quantitatively adjust the volume of the silencer chamber, and the action frequency of the silencer can be adjusted by changing the size of the silencer chamber volume; the bottom of the lower shell is connected to the main pipeline through a connecting hole, and there is a cover plate above the connecting hole, and several connecting pipes of different diameters are evenly distributed on the cover plate. By rotating the cover plate, connecting pipes of different diameters can be moved above the connecting hole, thereby achieving the purpose of adjusting the diameter of the connecting pipe, and the action frequency of the silencer can be adjusted again by adjusting the connecting pipe diameter. Therefore, the device can achieve dual adjustment of the connecting pipe diameter and the silencer volume, and can adjust the working frequency of the silencer over a wide range.

[0013] (2) Based on the device structure of the utility model, during the test, the muffler tuning device can complete the adjustment of the muffler frequency without replacement; the volume and the connecting pipe diameter can be adjusted simultaneously or separately to achieve the combination of the optimal acoustic design scheme; it can be reused in the test development of multiple products;

[0014] (3) By using transparent plastic to make the upper shell and marking the volume scale, and by marking the diameter value on each connecting pipe, the volume of the device and the connecting pipe information of the utility model are visible and easy to read, which is convenient for recording the test process parameters;

[0015] (4) Multiple muffler tuning devices of the present invention can be freely connected in series to further broaden the muffler frequency range; BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model provides a schematic structural diagram of a Helmholtz muffler tuning device with dual adjustable connection pipe diameter and muffler volume.

[0017] Figure 2 The utility model provides a schematic diagram of the appearance of a Helmholtz silencer tuning device with dual adjustable connection pipe diameter and silencer volume.

[0018] Figure 3 The utility model provides a front view of a Helmholtz muffler tuning device with dual adjustable connection pipe diameter and muffler volume.

[0019] Figure 4 A top view of a Helmholtz silencer tuning device with dual adjustable connection pipe diameter and silencer volume provided by the utility model.

[0020] In the figure: 1. upper shell; 2. piston; 3. piston fixing nut; 4. spring; 5. piston sealing ring; 6. clamp; 7. shell sealing ring; 8. nut; 9. cover plate; 10. port sealing ring; 11. lower shell; 12. muffler main channel. DETAILED DESCRIPTION

[0021] The present invention is further described and illustrated below in conjunction with specific implementations. The embodiments are merely exemplary of the present invention and do not define the scope of the present invention. The technical features of each implementation in the present invention can be combined accordingly without conflicting with each other.

[0022] Embodiment 1:

[0023] As attached Figure 1-Figure 4 In the embodiment 1 shown, a Helmholtz silencer tuning device with dual adjustable connection pipe diameter and silencer volume comprises an upper shell 1, a lower shell 11 and a main muffler channel 12, wherein the upper shell 1 is a cylindrical chamber with a piston mechanism 2 therein, the piston mechanism comprising a piston plate, a piston rod, a piston fixing nut 3, a spring 4 and a piston sealing ring 5; wherein the piston plate is arranged in the cylindrical chamber to divide the chamber into two parts, and a piston sealing ring 5 is arranged along the outer edge of the piston plate to achieve sealing isolation of the two parts; one end of the piston rod is connected to the back of the piston plate, and the other end extends out of the upper shell, and an external thread is provided on the extended section and the piston fixing nut 3 is sleeved thereon, the spring 4 is sleeved on the piston rod and is located between the back of the piston plate and the inner wall of the upper shell, and the movement direction of the piston plate is perpendicular to the axial direction of the main muffler channel 12, Figure 1 The piston is in the middle and moves up and down. When the piston moves up and down, the piston fixing nut 3 and the spring 4 provide positioning and support; when the piston 2 moves upward, the volume of the silencer cavity increases and the corresponding muffler action frequency decreases.

[0024] The lower shell 11 has another chamber, which is connected with the cylindrical chamber to form a muffler. The lower shell 11 is sealed and connected to the outer wall of the muffler main channel 12; a connecting hole for connecting to the second chamber is opened on the pipe wall of the muffler main channel 12; a port sealing ring 10 is arranged on the outlet end of the connecting hole facing the second chamber, and the port sealing ring 10 makes the outlet port of the connecting hole a horizontal port. A cover plate 9 is horizontally arranged in the second chamber, and the cover plate can rotate around its center. The cover plate covers the connecting hole, and a plurality of connecting pipes with different diameters are evenly distributed along the circumference; connecting pipes with different diameters can be connected to the connecting hole by rotating the cover plate.

[0025] In Example 1, the cover plate is a circular cover plate, which tightly covers the horizontal port; a stud is provided on the pipe wall of the main channel 12 of the muffler, and the center of the circular cover plate is sleeved on the stud, and a fixing nut 8 is provided on the stud to lock the rotation angle of the circular cover plate. The diameter of the connecting hole is larger than the diameter of each connecting pipe on the cover plate. In an optional embodiment of the utility model, the diameter of the main channel 12 of the muffler is 45-65mm; the diameter of the connecting hole is selected to be 40-45mm; the diameter range of each connecting pipe is between 15-40mm, and the diameter difference between each connecting pipe can be 2-3mm.

[0026] The distance from the center of each connecting pipe on the circular cover plate to the center of the cover plate is equal to the distance from the center of the connecting hole on the main channel 12 of the muffler to the center of the rotating shaft. The cover plate 9 is rotated to align the connecting pipe of the selected diameter with the connecting hole and then the cover plate is locked. After the upper and lower shells are fixed, the adjusted muffler action frequency can be tested in the corresponding system to see if it meets the expectations.

[0027] In this technical solution, after adjusting the connecting pipe, a shell sealing ring 7 is set at the connection between the upper and lower shells, and a clamp-type locking device 6 is used to fix the upper and lower shells. Then, the piston is moved according to demand to adjust the volume of the muffler. The entire adjustment process is simple to operate.

[0028] like Figure 3 and 4 As shown, the upper housing 1 is made of transparent plastic and marked with volume scale. Each connecting pipe on the cover plate 9 is marked with a diameter value for direct reading.

[0029] The method of using the device of the utility model is as follows: connect the two ends of the muffler main channel 12 of the device to the engine intake pipe. If the diameter of the engine intake pipe does not match that of the muffler main channel 12, a pipe with a gradually changing diameter can be used for transition connection. After the connection is completed, move the piston to the maximum volume position (with Figure 1 Take the top as an example), select the connecting pipe with the largest diameter to align with the connecting hole to complete the initialization. Start the engine, adjust the silencer volume by changing the piston position, select the connecting pipe by rotating the cover plate (during operation, first remove the upper shell, loosen the nut 8, rotate the cover plate to align the required connecting pipe with the connecting hole, and then tighten the nut 8 to ensure that the lower end of the cover plate is tightly sealed with the port sealing ring, and then reassemble the upper shell to make it sealed and connected with the lower shell), test the engine or engine intake pipe noise under different connecting pipe diameters and different silencer volume combinations. The noise can be detected with a microphone or acoustic sensor, and finally the optimal volume and connecting pipe diameter matching parameters that minimize the noise can be obtained.

[0030] Embodiment 2:

[0031] The technical solution of Example 2 is basically the same as the technical solution of Example 1, except that: a plurality of cover plates 9 of different sizes can be manufactured, and the cover plates 9 of different sizes can be directly replaced and then the diameter of the connecting pipe can be adjusted according to demand, thereby further expanding the adjustment range of the muffler.

[0032] Furthermore, two of the present silencers can be connected in series to form a dual-chamber silencer. In the series connection mode, any number of silencers can be connected in series and a plurality of cover plates of different specifications can be manufactured for replacement and adjustment.

[0033] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. For ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A Helmholtz muffler tuning device with dual adjustable connection pipe diameter and muffler volume, characterized in that: The device comprises an upper shell, a lower shell and a main channel of a muffler; the upper shell has a first cavity, the first cavity is a cavity of equal diameter, the lower shell has a second cavity, and the first cavity and the second cavity are connected to form a muffler cavity; the first cavity is provided with a piston mechanism capable of changing the volume of the first cavity; The lower shell is sealedly connected to the outer wall of the main channel of the muffler; a connecting hole for connecting to the second chamber is opened on the pipe wall of the main channel of the muffler; a cover plate (9) is horizontally arranged in the second chamber, the cover plate can rotate around its center, the cover plate covers the connecting hole, and a plurality of connecting pipes with different diameters are evenly distributed along the circumference; the connecting pipes with different diameters can be connected to the connecting hole by rotating the cover plate.

2. The tuning device according to claim 1, characterized in that: A port sealing ring (10) is provided on the outlet end of the communicating hole facing the second chamber, and the port sealing ring (10) makes the outlet end of the communicating hole a horizontal port.

3. The tuning device according to claim 2, characterized in that: The cover plate is a circular cover plate, which tightly covers the horizontal port; a stud is provided on the pipe wall of the main flow channel of the muffler, the center of the circular cover plate is sleeved on the stud, and a fixing nut (8) is provided on the stud for locking the rotation angle of the circular cover plate.

4. The tuning device according to claim 3, characterized in that: The distance from the center of each connecting pipe on the circular cover plate to the center of the cover plate is equal to the distance from the center of the connecting hole on the main flow channel of the muffler to the center of the rotating shaft.

5. The tuning device according to claim 1, characterized in that: The piston mechanism comprises a piston plate, a piston rod, a piston fixing nut (3), a spring (4) and a piston sealing ring (5); wherein the piston plate is arranged in the first cavity to divide the first cavity into two parts, and the piston sealing ring (5) is arranged around the outer edge of the piston plate; one end of the piston rod is connected to the back side of the piston plate, and the other end extends out of the upper shell body, and the extended section is provided with an external thread and is sleeved with the piston fixing nut (3); the spring (4) is sleeved on the piston rod and is located between the back side of the piston plate and the inner wall surface of the upper shell body.

6. The tuning device according to claim 5, characterized in that: The movement direction of the piston plate is perpendicular to the axial direction of the main flow channel of the muffler.

7. The tuning device according to claim 1, characterized in that: The upper shell (1) is fixed together with the lower shell (11) by means of a clamp-type locking device (6), wherein a shell sealing ring (7) is provided between the upper shell (1) and the lower shell (11) to ensure sealing.

8. The tuning device according to claim 1, characterized in that: The upper shell (1) is made of transparent plastic and is marked with volume scales, so that the volume value can be directly read when the volume is adjusted by the piston mechanism.

9. The tuning device according to claim 1, characterized in that: Each connecting pipe on the cover plate (9) is marked with a diameter value for easy direct reading.

10. The tuning device according to claim 1, characterized in that: The diameter of the communicating hole is larger than the diameter of each connecting pipe on the cover plate.

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