Damping device

Abstract

The utility model relates to a damping device which is particularly used for damping or avoiding pressure impact such as pulsation in a fluid supply loop, the damping device is preferably in the form of a silencer, and the damping device is provided with a damping shell (10) and a damping pipe (28) extending in the damping shell (10). The utility model relates to a damping housing (10) for damping a fluid flow, comprising a damping tube (28) which has an inlet (20) and an outlet (22) for the fluid flow to be damped and which has at least one branch opening (30) which produces a flow-conducting connection between the interior of the damping tube (28) and a damping volume (38) enclosed between the damping tube (28) and the damping housing (10). According to the invention, the respective branch opening (30) has a tubular connecting section (32) which has a predeterminable length and a predeterminable diameter and which opens into the damping volume (38).

Description

Technical Field

[0001] This utility model relates to a damping device, particularly for damping or preventing pressure surges, such as pulsations, in a fluid supply circuit. The damping device is preferably in the form of a muffler. The damping device has a damping housing and a damping tube extending in the damping housing. The damping tube has an inlet and an outlet for the fluid flow to be damped and has at least one branch opening that creates a flow-guiding connection between the inside of the damping tube and a damping volume surrounded between the damping tube and the damping housing. Background Technology

[0002] A damping device is known from DE102015000418A1. This device has a damping housing surrounding a damping space, the housing having at least one fluid inlet and outlet, and a damping tube in a flow path between them. The damping tube has at least one branch opening for forming a Helmholtz resonator in a region along its length. The branch opening passes through the tube wall and leads to a Helmholtz volume within the damping housing. A fluid filter is disposed in the flow path extending within the damping housing between the fluid inlet and outlet. Integrating the fluid filter into the damping housing allows for a particularly compact structure while improving operational safety by eliminating piping that would otherwise be necessary between the filter and the damper.

[0003] A liquid silencer is known from DE102009021683A1. This liquid silencer includes a damper housing having a main dimension defining a longitudinal axis of the housing, and a damping tube extending along the longitudinal axis of the housing between an inlet opening and an outlet opening in the damper housing. The damping tube has at least one radial opening, and the liquid silencer has means for changing the position and / or size of the opening in the damping tube. Thus, the damping of the liquid silencer can be adaptively optimized during operation of the pressurized fluid system.

[0004] A damping device, preferably in the form of a muffler, is known from DE102018003848A1. This damping device has a damping shell surrounding a damping space, the damping shell having at least one fluid inlet and at least one fluid outlet, and a fluid receiving space extending between the fluid inlet and the fluid outlet. During operation of the device, fluid flow from the fluid inlet traverses the damping space towards the fluid outlet, and the wall portion of the fluid receiving space extends as guiding elements in at least one expansion direction transverse to the direction of fluid flow. Thus, it is preferable to provide multiple guiding elements in the damping space that allow fluid flow to enter and locally alter its flow velocity, thereby improving the damping efficiency of the damping device. Due to the design of the damping device, at least the damping shell can advantageously be additively manufactured using a 3D printing method, constructed as a single piece with the guiding elements. Utility Model Content

[0005] Based on this prior art, the objective of this invention is to provide a damping device with improved damping characteristics compared to the prior art, which can be manufactured simply and at low cost.

[0006] A damping device according to the present invention solves the relevant task in its entirety.

[0007] Therefore, this invention proposes a damping device comprising a damping shell and a damping tube extending within the damping shell. The damping tube has an inlet and an outlet for the fluid flow to be damped and at least one branch opening. This branch opening creates a flow-guiding connection between the interior of the damping tube and a damping volume enclosed between the damping tube and the damping shell. Each branch opening has a tubular connecting portion with a predetermined length and a predetermined diameter. The connecting portion extends into the damping volume, realizing individual tubular components that, as oscillating bodies, correspondingly dampen the fluid flowing through them. Preferably, the longitudinal axis of each tubular connecting portion is perpendicular to the longitudinal axis of the damping tube, and its orientation is predetermined for the main flow direction of the fluid flowing through the damping tube.

[0008] In a particularly preferred embodiment of the damping device according to the present invention, the damping device is specified as being used to dampen or prevent pressure surges in the fluid supply circuit.

[0009] In a particularly preferred embodiment of the damping device according to the present invention, the pressure impact is specified as pulsation.

[0010] In a particularly preferred embodiment of the damping device according to the present invention, the damping device is specified to be in the form of a muffler.

[0011] Here, in particular, the corresponding branch opening in the damping tube seamlessly transitions into the internal space of the tubular connecting portion, and the geometry of the branch opening continues in the connected portion. Preferably, the corresponding tubular connecting portion transitions seamlessly into the damping tube in one piece within the area of ​​the branch opening, and the damping device is formed by integrating the damping housing, damping tube, and branch opening, along with all components of the tubular connecting portion, into a single component. Therefore, the aforementioned structural components can be quickly and easily adapted to specific conditions, which helps to save manufacturing costs.

[0012] In a particularly preferred embodiment of the damping device according to this invention, multiple branch openings, along with their respective tubular connecting portions, pass through a damping tube, and each single frequency of the fluid flow to be damped is provided with a specially designed connecting portion. Thus, the frequency to be damped can be set via the diameter and length of the corresponding tubular connecting portions, thereby forming a multi-Helmholtz resonator. However, for a range of damping frequencies, it is advantageous to have a row of identical or different types of connecting portions arranged side-by-side. Therefore, one opening in the damping tube dampens one frequency, and multiple openings with different cross-sections dampen a frequency range.

[0013] Preferably, at least some of the connecting parts used are geometrically different from each other, and preferably all connecting parts are different from each other. If all connecting parts are designed differently in terms of their geometry, effective damping of vibrations occurring in the fluid flow in the damping tube can be achieved over a very wide frequency spectrum. In principle, multiple connecting parts, especially for high and low frequencies, can be provided within the damping device, which may not be necessary for certain applications; however, they are very useful in other applications, and thus it is entirely possible to provide connecting parts for the tubular shape used in the mid-frequency range, without the need for such connections.

[0014] Thus, a connection with a small inner diameter and a large length is better suited for damping the low frequency of the fluid flow than a connection with a large inner diameter and a short structural length that is preferred for damping high frequencies.

[0015] To improve the damping effect when strong pressure pulsations occur in the fluid flow, it is preferable to specify that the wall thickness of the damping tube is increased relative to the wall thickness of the damping shell.

[0016] If multiple connecting portions of different designs are arranged in a row along the damping tube while maintaining discrete distances from each other, preferably equal distances, and another row with connecting portions exists on the opposite side of the damping tube in addition to the first row, then reliable damping can be largely achieved over a very wide frequency spectrum for the fluid, even when the inherent vibration characteristics of the damping tube are low. Here, with regard to the desired vibration characteristics, it has proven advantageous that the number of connecting portions in one row is designed to differ from the number of connecting portions in the other row.

[0017] In a particularly preferred embodiment of the damping device according to this utility model, the damping shell and the damping tube, together with their connecting parts, are manufactured as a single piece using an additive manufacturing method. This allows for low manufacturing costs while ensuring that the structural dimensions of the damping device are adaptable to various applications without deviating from the basic structure of the damping device. There is no corresponding solution in the prior art for this.

[0018] In another particularly preferred embodiment of the damping device according to the present invention, the damping volume defined by the damping housing and the damping tube is designed annularly, the damping volume having a larger longitudinal extension dimension when viewed parallel to the possible fluid flow direction than when viewed transversely to the possible fluid flow direction. This particularly induces uniform flow guidance of the fluid introduced into the damping space via the tubular connection in the region of the turning portion in the damping housing, i.e., in the inlet and outlet regions of the damping tube, thereby improving the overall damping performance of the damping device according to the present invention. Attached Figure Description

[0019] The damping device according to the present invention will now be explained in detail with reference to the embodiments shown in the accompanying drawings. In the drawings:

[0020] Figure 1 The damping device as a whole is shown in a scaled-down, three-dimensional view; and

[0021] Figure 2 Showing according to Figure 1 An enlarged longitudinal section of the damping device. Detailed Implementation

[0022] Figure 1 In relation to Figure 2The damping device as a whole is shown in scale and perspective. The cylindrical damping housing 10 is constructed with a smooth outer wall 12 and is symmetrically arranged. Towards the free end of the damping housing 10, the outer wall 12 extends in an arc-shaped rounded shape into an end wall 14, through which a central opening 16 with a centrally located internally threaded portion 18 is passed. This internally threaded portion is used to connect a piping (not shown in detail) that supplies the fluid flow to be smoothed or damped as part of a fluid supply circuit, thereby allowing the fluid flow to be discharged from the damping housing 10 in a manner free from pressure surges, such as pulsations. Here, viewed along the direction of view, the central opening 16 on the right side constitutes a fluid inlet 20 for the fluid flow, and the central opening 16 on the left side, with the same construction, serves as a fluid outlet 22 through which the fluid flow is discharged from the damping housing 10. However, as far as the damping device is concerned with its overall axisymmetric structure, there is also the possibility of changing the flow direction, so that the fluid flows in through the outlet 22 and flows out of the damping housing 10 through the inlet 20.

[0023] Such as especially Figure 2 As shown in the longitudinal section, the damping housing 10 includes a central cylindrical wall section 24 with a constant wall thickness, which transitions at its end along the direction of the end wall 14 of the respective end side into a cover portion 26 with a relatively increased wall thickness. A cylindrical damping tube 28 extends integrally within the damping housing 10, transitioning at its end into a correspondingly disposed cover portion 26, and on its free end side, the damping tube 28 enters into a corresponding internally threaded portion 18, which is thus accommodated in the corresponding cover portion 26. The damping tube 28 has a wall thickness in its central accommodating region that is at least slightly thicker than the wall thickness along the cylindrical wall section 24 of the damping housing 10. In this respect, the damping tube 28 is also connected to the inlet 20 and outlet 22 of the damping housing 10. Further from... Figure 2 As it turns out, a separate, coherent branch opening 30 with a predetermined inner diameter is introduced into the damping tube 28. A separate tubular connecting portion 32, preferably a one-piece connection to the damping tube 28, is connected to the corresponding branch opening 30. The axial structural length of the connecting portion is predetermined, but the inner diameter of the connecting portion is adapted to the inner diameter of the corresponding branch opening 30.

[0024] If from another Figure 2As it turns out, the longitudinal axes 34 of each branch opening 30, together with the corresponding connecting portions 32, are perpendicular to the central axis 36 of the damping tube 28, along which the fluid flow to be damped travels from the inlet 20 side toward the outlet 22. This causes a sharp right-angle turn in the fluid flow from the damping tube 28 toward the corresponding outlet of a tubular connecting portion 32 to the damping volume 38, which is located between the damping tube 28 and the damping housing 10 on the inner circumference side. In this sense, each connecting portion 32 forms a guiding pipe connection between the inside of the damping tube 28 and the damping volume 28, into which fluid correspondingly flows back from the damping tube 28 into the pipe connection during the operation of the damping device.

[0025] In this regard, multiple branch openings 30, together with their respective tubular connecting portions 32, pass through the damping tube 28, and each frequency range or single frequency of the fluid flow to be damped is provided with a specially designed connecting portion 32, which is configured to be of different lengths and, together with the provided branch openings 30, defines discrete diameters for branching the fluid from the main fluid flow in the damping tube 28. Here, it is preferable to follow the method described above. Figure 2 The illustration specifies that all connecting portions 32, together with their branch openings 30, are geometrically different from each other in order to achieve damping or smoothing of fluid pulsations over a wide frequency range. Here, experiments have shown that connecting portions 32 with small inner diameters and long lengths dampen low frequencies of the fluid flow better than connecting portions 32 with large inner diameters and short structural lengths, which are primarily responsible for damping high frequencies. Furthermore, to improve damping performance when strong pressure pulsations occur in the fluid flow, the wall thickness of the tubular connecting portions can be increased relative to the wall thickness of the damping tube 28. However, in the current embodiment, for damping purposes, the wall thickness of the tubular connecting portions 32 is specified to be thinner than the wall thickness of the damping housing 10 and the wall thickness of the damping tube 28. However, in this respect, the selected method for damping is as follows... Figure 2 All connecting portions 32 used in the damping housing 10 are constructed with the same wall thickness.

[0026] Furthermore, what has proven advantageous for damping effect is that multiple connecting portions 32 of different designs are arranged in a row along the damping tube 28 while maintaining a discrete distance from each other, said distance preferably being the same. Therefore, along the direction... Figure 2 Viewed from the direction of observation, the damping tube 28 has two connecting portions 32 on its upper side, together with the associated branch openings 30 in the damping tube 28. In contrast, the damping tube 28 has another row of connecting portions 32 on its opposite lower side, in this case, three connecting portions 32 together with the associated branch openings 30.

[0027] The damping volume 38, defined by the damping housing 10 and the damping tube 28, is designed annularly. That is, in the transition region between the cylindrical wall section 24 and the cover portion 26, the inner wall of the damping housing 10 is constructed such that an annular fluid space is formed for the damping volume 38, and in this regard, the annular, concave receiving area formed in the cover portion 26 allows for further improvement in the damping effect on the fluid.

[0028] The damping device according to the accompanying drawings is manufactured in one piece by means of an additive manufacturing method, for example, within the scope of selective laser sintering methods for materials made of metal. The relevant additive manufacturing method is mentioned only by way of example, and other suitable 3D manufacturing methods may be used herein. In this regard, the damping housing 10 and the damping tube 28 with all their connecting portions 32 are manufactured in one piece, and the two joints in the form of internally threaded portions 18 allow the muffler to be constructed and positioned in a particularly simple manner within the manufacturing space of the additive manufacturing machine. Thus, it is also possible to obtain, in a particularly advantageous manner, a central damping tube 28 having tubular connecting portions 32 to be housed in the corresponding branch openings 30.

[0029] The tubular connecting portion 32 is designed as a hollow cylinder with a preferred circular channel cross-section. However, the circular shape, determined by a 3D method, can be approximated by a polygon.

[0030] In general, an additive manufacturing method is used to obtain a damping device as a whole, which can be adapted in terms of structural dimensions and all its components in a cost-effective manner for a wide range of applications. There is no corresponding solution in the prior art.

Claims

1. A damping device having a damping housing (10) and a damping tube (28) extending therein, the damping tube having an inlet (20) and an outlet (22) for a fluid flow to be damped and having at least one branch opening (30) that creates a flow-guiding connection between the interior of the damping tube (28) and a damping volume (38) enclosed between the damping tube (28) and the damping housing (10), characterized in that, The corresponding branch opening (30) has a tubular connecting portion (32) having a predetermined length and a predetermined diameter, the connecting portion being inserted into the damping volume (38), the damping housing (10) and the damping tube (28) together with their connecting portions (32) being manufactured in one piece by means of an additive manufacturing method.

2. The damping device according to claim 1, characterized in that, The damping device is used to dampen or prevent pressure surges in the fluid supply circuit.

3. The damping device according to claim 2, characterized in that, The pressure shock is pulsating.

4. The damping device according to claim 1, characterized in that, The damping device is in the form of a muffler.

5. The damping device according to claim 1, characterized in that, Multiple branch openings (30) together with their respective tubular connecting portions (32) pass through the damping tube (28), and each single frequency or frequency range of the fluid flow to be damped is provided with a specially designed connecting portion (32) or a row of connecting portions (32).

6. The damping device according to any one of claims 1 to 5, characterized in that, At least some of the connecting parts (32) used are geometrically different from each other.

7. The damping device according to any one of claims 1 to 5, characterized in that, All the connecting parts (32) are different from each other.

8. The damping device according to any one of claims 1 to 5, characterized in that, The connecting portion (32) with a small inner diameter and a long length dampes the low frequency of the fluid flow better than the connecting portion (32) with a large inner diameter and a short structural length that is responsible for damping the high frequency.

9. The damping device according to any one of claims 1 to 5, characterized in that, The wall thickness of the damping housing (10) is constructed to be enhanced relative to the wall thickness of the damping tube (28) to improve the damping effect when strong pressure pulsations occur in the fluid flow.

10. The damping device according to any one of claims 1 to 5, characterized in that, Multiple connecting parts (32) of different designs are arranged in a row along the damping tube (28) while maintaining a discrete distance from each other.

11. The damping device according to claim 10, characterized in that, The distances are the same.

12. The damping device according to claim 10, characterized in that, In addition to the first row, there is another row with connecting portions (32) on the opposite side of the damping tube (28).

13. The damping device according to claim 12, characterized in that, The number of connecting parts (32) in one row is different from the number of connecting parts (32) in the other row.

14. The damping device according to any one of claims 1 to 5, characterized in that, The damping volume (38) defined by the damping housing (10) and the damping tube (28) is designed in an annular shape, and the damping volume has a larger longitudinal extension dimension when viewed parallel to the fluid flow direction than when viewed transversely to the fluid flow direction.

Images