CN222810894U

CN222810894U - A Helmholtz muffler tuning device with dual adjustable connection pipe diameter and muffler volume

Info

Publication number: CN222810894U
Application number: CN202422239092.0U
Authority: CN
Inventors: 李一民; 肖昌龙; 叶慧飞; 宋平; 张焕宇; 陈月曦
Original assignee: Hangzhou Weining Automotive Technology Co ltd
Current assignee: Hangzhou Weining Automotive Technology Co ltd
Priority date: 2024-09-12
Filing date: 2024-09-12
Publication date: 2025-04-29
Anticipated expiration: 2034-09-12

Abstract

The utility model discloses a Helmholtz muffler tuning device with dual adjustable connection pipe diameter and muffler volume. It includes an upper shell, a lower shell and a muffler main channel; a piston mechanism is arranged in the upper shell, which can move up and down to accurately and quantitatively adjust the volume of the muffler muffler chamber, and the action frequency of the muffler can be adjusted by changing the size of the muffler chamber volume; the bottom of the lower shell is connected to the muffler main channel through a connecting hole, and a cover plate is arranged above the connecting hole, and several connecting pipes of different diameters are evenly distributed on the cover plate; the connecting pipes of different diameters can be moved to the top of the connecting hole by rotating the cover plate, so as to achieve the purpose of adjusting the diameter of the connecting pipe, and the action frequency of the muffler can be adjusted again by adjusting the connection pipe diameter. The utility model device can greatly reduce the complexity of sample replacement in the tuning test process, improve the development and test efficiency of muffler products, and is suitable for the acoustic design, development and test debugging of vehicle intake systems.

Description

Helmholtz silencer tuning device with double-adjustable connecting pipe diameter and silencing volume

Technical Field

The utility model relates to the field of engine air intake, in particular to a Helmholtz silencer tuning device with double adjustable connecting pipe diameter and silencing volume, which is used for verifying the acoustic effect of an engine air intake system.

Background

During engine air intake system design, various mufflers are typically designed into the air intake system to attenuate noise generated during engine operation. In general, test verification of acoustic effects is performed by manufacturing samples after designing a muffler scheme, and sample preparation needs to be performed for multiple rounds in different development stages, so that the whole manufacturing period is long and the manufacturing cost is high. Meanwhile, in order to meet the requirement of covering the muffling frequency with a certain bandwidth in the test process, a plurality of tuning sample pieces are required to be manufactured according to different action frequencies, and the frequent replacement of the sample pieces in the tuning test process is more troublesome.

CN211230581U discloses a flow-adjustable muffler, it includes the muffler barrel, fixedly connected with barrel left end board and barrel right end board respectively at the both ends of muffler barrel, be provided with intake pipe and outlet duct on the section of thick bamboo wall of muffler barrel, the barrel intracavity of muffler barrel is fixedly provided with a barrel chamber baffle, and this barrel chamber baffle separates into left expansion chamber and right expansion chamber with the muffler barrel, installs the perforating pipe on a barrel chamber baffle, and the left section of this perforating pipe is located left expansion chamber, and the right section of perforating pipe is located right expansion chamber, and the right section chamber of perforating pipe is provided with the regulation and control slide cup that is cup-shaped structure in the sliding of the right section chamber of perforating pipe, and the rim of a cup of regulation and control slide cup is towards left expansion chamber, and fixed mounting is in the regulation and control pole at the bottom of the regulation and control slide cup sliding support on barrel right end board and stretch to the outside of barrel right end board. The through-flow adjustable muffler can adjust the through-flow of the exhaust flow area according to the rotation speed of the engine and the exhaust pressure, has very high market value, but can only singly adjust the flow area of the perforated pipe of the cavity on one side, has smaller adjustable range and undefined flow area after adjustment, and has smaller application range and inconvenient adjustment.

Disclosure of utility model

In order to solve the problems in the prior art, the utility model provides a Helmholtz silencer tuning device with double adjustable connecting pipe diameter and silencing volume. The device can only make an adjustable sample according to specific needs in the verification process, can adjust the connecting pipe diameter fast, accurately, conveniently, and the sound elimination chamber volume and the action frequency expand the working range of silencer, lock the optimal design scheme of silencer, reach the development target of saving sample manufacturing, test time and expense.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

The utility model firstly provides a helm hertz silencer tuning device with double adjustable connecting pipe diameter and silencing volume, which comprises an upper shell, a lower shell and a silencer main runner, wherein a first cavity is arranged in the upper shell, the first cavity is a constant-diameter cavity, a second cavity is arranged in the lower shell, and the first cavity and the second cavity are communicated to form a silencing cavity;

The lower shell is in sealing connection with the outer wall surface of the main flow channel of the muffler, a communication hole used for communicating the second cavity is formed in the pipe wall of the main flow channel of the muffler, a cover plate is horizontally arranged in the second cavity and can rotate around the center of the second cavity, the cover plate covers the communication hole, a plurality of connecting pipes with different diameters are uniformly distributed in the circumferential direction, and the connecting pipes with different diameters can be communicated with the communication hole by rotating the cover plate.

According to a preferred embodiment of the utility model, the outlet end of the communication hole facing the second chamber is provided with a port sealing ring, which makes the outlet end port of the communication hole a horizontal port.

Furthermore, the cover plate is a round cover plate, the round cover plate is tightly covered on the horizontal port, a stud is arranged on the pipe wall of the main flow passage of the muffler, the center of the round cover plate is sleeved on the stud, and a fixing nut is arranged on the stud and used for locking the rotating angle of the round 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 communicating hole on the main flow passage of the muffler to the center of the rotating shaft.

According to the preferred embodiment of the utility model, the piston mechanism comprises a piston plate, a piston rod, a piston fixing nut, a spring and a piston sealing ring, wherein the piston plate is arranged in a first cavity to divide the first cavity into two parts, the piston sealing ring is arranged on the outer edge of the piston plate, one end of the piston rod is connected with the back surface of the piston plate, the other end of the piston rod extends out of the upper shell, the extending section is provided with external threads and sleeved with the piston fixing nut, and the spring is sleeved on the piston rod and is positioned between the back surface of the piston plate and the inner wall surface of the upper shell.

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

(1) The device provided by the utility model has the advantages that the piston in the upper shell can move up and down so as to accurately and quantitatively adjust the volume of the silencing cavity of the silencer, the acting frequency of the silencer can be adjusted through the change of the volume of the silencing cavity, the bottom of the lower shell is communicated with the main pipeline through the communication hole, the upper part of the communication hole is provided with the cover plate, 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 upper part of 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 muffler is adjusted again by adjusting the diameter of the connecting pipe. Therefore, the device can realize the dual adjustment of the connecting pipe diameter and the silencing volume, and can adjust the working frequency of the silencer in a large range.

(2) Based on the device structure, the sound-deadening frequency of the sound-deadening device can be adjusted without replacement in the test process, and the volume and the diameter of the connecting pipe can be simultaneously or independently adjusted to realize the combination of optimal acoustic design schemes;

(3) The device has the advantages that the volume and the connecting pipe information are visible and easy to read by using transparent plastic to manufacture the upper shell and marking volume scales and marking diameter values on each connecting pipe, so that the parameters of the test process can be conveniently recorded;

(4) The sound tuning devices of the sound damper can be freely combined in series so as to further widen the sound damping frequency range;

Drawings

Fig. 1 is a schematic structural view of a helmholtz silencer tuning device with double adjustable connecting pipe diameters and silencing volumes.

Fig. 2 is an external schematic view of a helmholtz silencer tuning device with double adjustable connecting pipe diameter and silencing volume.

Fig. 3 is a front view of the helmholtz silencer tuning device with double adjustable connecting pipe diameter and silencing volume.

Fig. 4 is a top view of the helmholtz silencer tuning device with double adjustable connecting pipe diameter and silencing volume.

In the figure, 1, an upper shell, 2, a piston, 3, a piston fixing nut, 4, a spring, 5, a piston sealing ring, 6, a hoop, 7, a shell sealing ring, 8, a nut, 9, a cover plate, 10, a port sealing ring, 11, a lower shell, 12 and a muffler main runner.

Detailed Description

The utility model is further illustrated and described below in connection with specific embodiments. The described embodiments are merely exemplary of the present disclosure and do not limit the scope. The technical features of the embodiments of the utility model can be combined correspondingly on the premise of no mutual conflict.

Example 1:

In the embodiment 1 shown in fig. 1-4, the helm hertz silencer tuning device with double adjustable connecting pipe diameter and silencing volume comprises an upper shell 1, a lower shell 11 and a silencer main runner 12, wherein the upper shell 1 is a cylindrical cavity, a piston mechanism 2 is arranged in the upper shell, the piston mechanism comprises a piston plate, a piston rod, a piston fixing nut 3, a spring 4 and a piston sealing ring 5, the piston plate is arranged in the cylindrical cavity to divide the cavity into two parts, the piston sealing ring 5 is arranged on the outer edge of the piston plate in a circle to realize sealing isolation of the two parts, one end of the piston rod is connected with the back surface of the piston plate, the other end of the piston rod extends out of the upper shell, the extending section is provided with external threads and sleeved with the piston fixing nut 3, the spring 4 is sleeved on the piston rod and is positioned between the back surface of the piston plate and the inner wall surface of the upper shell, and the moving direction of the piston plate is vertical to the axis direction of the silencer main runner 12, and moves up and down in fig. 1. Positioning and support are provided by the piston fixing nut 3 and the spring 4 when the piston moves up and down, and the muffler operating frequency becomes smaller when the volume of the muffling chamber becomes larger when the piston 2 moves up.

The lower housing 11 has another chamber therein, which communicates with the cylindrical chamber to form a sound-deadening chamber. The lower shell 11 is in sealing connection with the outer wall surface of the main flow channel 12 of the silencer, a communication hole for communicating the second chamber is formed in the pipe wall of the main flow channel 12 of the silencer, a port sealing ring 10 is arranged on the outlet end of the communication hole, which faces the second chamber, of the communication hole, and the port sealing ring 10 enables the outlet end port of the communication hole to be a horizontal port. A cover plate 9 is horizontally arranged in the second cavity, the cover plate can rotate around the center of the second cavity, the cover plate covers the communication hole, a plurality of connecting pipes with different diameters are uniformly distributed along the circumferential direction, and the connecting pipes with different diameters can be communicated with the communication hole by rotating the cover plate.

In the embodiment 1, the cover plate is a round cover plate, the round cover plate is tightly covered on the horizontal port, a stud is arranged on the pipe wall of the main flow channel 12 of the muffler, the center of the round cover plate is sleeved on the stud, and a fixing nut 8 is arranged on the stud for locking the rotation angle of the round cover plate. The diameter of the communication hole is larger than that of each connecting pipe on the cover plate. In an alternative embodiment of the present utility model, the diameter of the muffler main flow passage 12 is 45-65mm, the diameter of the communication hole is 40-45mm, the diameter of each connection pipe is 15-40mm, and the diameter difference between the connection pipes may be 2-3mm.

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 communication hole on the main flow passage 12 of the muffler to the center of the rotating shaft. The cover plate 9 is rotated to align the connecting pipe with the selected diameter with the communication hole and then is locked, and after the upper and lower shells are fixed, whether the regulated muffler operating frequency meets the expected or not can be tested in the corresponding system.

In this technical scheme, after adjusting the connecting pipe, set up casing sealing washer 7 in upper and lower casing junction to use staple bolt formula locking device 6 fixed upper and lower casing, then remove piston regulation silencer volume according to the demand, whole adjustment process easy operation.

As shown in fig. 3 and 4, the upper housing 1 is made of transparent plastic and is marked with volume scales. Each connecting tube on the cover plate 9 is marked with a diameter value for direct reading.

The method for using the device comprises the following steps of connecting two ends of a main muffler runner 12 of the device to an air inlet pipe of an engine, wherein if the pipe diameter of the air inlet pipe of the engine is not matched with that of the main muffler runner 12, a pipeline with gradually changed pipe diameter can be used for transitional connection. After the connection is completed, the piston is moved to the maximum volume position (the top is the example in fig. 1), and the connecting pipe with the largest pipe diameter is selected to be aligned with the communication hole, so that the initialization is completed. Starting the engine, adjusting the silencing volume by changing the position of the piston, selecting a connecting pipe by rotating the cover plate (during operation, firstly removing the upper shell, unscrewing the nut 8, rotating the cover plate to align the connecting hole with the required connecting pipe, then screwing the nut 8 to ensure that the lower end of the cover plate is tightly attached to the port sealing ring for sealing, then reassembling the upper shell to be in sealing connection with the lower shell), testing the noise of the engine or the engine air inlet pipe under the combination of different connecting pipe diameters and different silencing volumes, detecting the noise by using a microphone or an acoustic sensor, and finally obtaining the optimal volume for minimizing the noise and the matching parameters of the pipe diameter of the connecting pipe.

Example 2:

The technical scheme of the embodiment 2 is basically the same as that of the embodiment 1, and the difference is that a plurality of cover plates 9 with different sizes can be manufactured, the cover plates 9 with different sizes can be directly replaced, and then the diameter of the connecting pipe can be adjusted according to the requirements, so that the adjusting range of the muffler can be further enlarged.

Further, two of the two mufflers can be connected in series to form a double-cavity muffler, any number of the mufflers can be connected in series in a series mode, and a plurality of cover plates with different specifications can be manufactured for replacement adjustment.

The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the utility model.

Claims

1. The Helmholtz silencer tuning device with the double adjustable connecting pipe diameter and silencing volume is characterized by comprising an upper shell, a lower shell and a silencer main runner, wherein a first cavity is formed in the upper shell, the first cavity is an equal-diameter cavity, a second cavity is formed in the lower shell, and the first cavity and the second cavity are communicated to form a silencing cavity;

The lower shell is in sealing connection with the outer wall surface of the main flow passage of the muffler, a communication hole used for communicating a second cavity is formed in the pipe wall of the main flow passage of the muffler, a cover plate (9) is horizontally arranged in the second cavity and can rotate around the center of the second cavity, the cover plate covers the communication hole, a plurality of connecting pipes with different diameters are uniformly distributed in the circumferential direction, and the connecting pipes with different diameters can be communicated with the communication hole by rotating the cover plate.

2. A tuning device according to claim 1, wherein the communication hole is provided with a port sealing ring (10) on the outlet end facing the second chamber, the port sealing ring (10) making the outlet end port of the communication hole a horizontal port.

3. The tuning device according to claim 2, wherein the cover plate is a circular cover plate, the circular cover plate is tightly covered on the horizontal port, a stud is arranged on the pipe wall of the main flow passage of the muffler, the center of the circular cover plate is sleeved on the stud, and a fixing nut (8) is arranged on the stud and used for locking the rotation angle of the circular cover plate.

4. A tuning device as claimed in claim 3, wherein the distance from the center of each connecting tube on the circular cover plate to the center of the cover plate is equal to the distance from the center of the communication hole on the main flow passage of the muffler to the center of the rotating shaft.

5. The tuning device according to claim 1, wherein 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, the piston sealing ring (5) is arranged on the outer edge of the piston plate, one end of the piston rod is connected with the back surface of the piston plate, the other end of the piston rod extends out of the upper shell, the extending section is provided with external threads and sleeved with the piston fixing nut (3), and the spring (4) is sleeved on the piston rod and is positioned between the back surface of the piston plate and the inner wall surface of the upper shell.

6. The tuning device of claim 5, wherein the direction of movement of the piston plate is perpendicular to the axial direction of the muffler primary flow passage.

7. A tuning device according to claim 1, wherein the upper housing (1) is fixed to the lower housing (11) by means of a locking device (6), wherein the tightness between the upper housing (1) and the lower housing (11) is ensured by means of a housing sealing ring (7).

8. A tuning device according to claim 1, characterized in that the upper housing (1) is made of transparent plastic and is provided with volume graduations, the volume values being directly readable when the volume is adjusted by the piston means.

9. A tuning device according to claim 1, wherein each connecting tube on the cover plate (9) is provided with a diameter value for direct reading.

10. The tuning device of claim 1, wherein the communication holes have a diameter greater than a diameter of each of the connection tubes on the cover plate.