Pipeline vibration reduction structure and variable frequency unit

Abstract

This utility model discloses a pipeline vibration damping structure and a variable frequency drive unit, applicable to bent pipelines. The bent pipeline includes a first straight section, a bend, and a second straight section, with the first and second straight sections located on the same plane. The pipeline vibration damping structure includes a connecting part, a first fixing member, and a second fixing member. The connecting part has a contact surface, and the entire range of the bend is in contact with the contact surface of the connecting part. The first and second fixing members fix the connecting part to the first and second straight sections. One or two pipeline vibration damping structures are included at the same bend. The connecting part transmits the vibration at the bend to the first and second straight sections at both ends of the bend, gradually dissipating it, thereby achieving a wide-band vibration damping effect. It is applicable to all pipelines with different diameters, structures, and materials, and is suitable for all variable frequency and fixed frequency drive units.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, specifically to a pipeline vibration reduction structure. Background Technology

[0002] As the operating frequency range of variable frequency drives (VFDs) expands, pipeline vibration becomes an increasingly prominent issue. Taking VFD screw compressors as an example, the oil supply and gas supply pipelines connected to the compressor experience significant excitation from the compressor and airflow pulsations. This makes these pipelines prone to resonance within the operating frequency range, leading to fatigue fracture and leakage. Common solutions include adding counterweights or supports to areas of high vibration, altering the pipeline structure to change its natural frequency, or using structural damping to reduce vibration amplitude. However, adding counterweights to the pipeline may cause a shift in the pipeline's resonance range. The shifted resonance range is still within the unit's operating frequency range, and the vibration response is still large, causing the pipeline to vibrate beyond the standard in the shifted resonance frequency range. Furthermore, since the pipeline often exhibits large vibration amplitudes at low frequencies, and the counterweight's size and fixed position limit the amplitude it absorbs, its vibration reduction effect on some pipelines is not significant. On the other hand, adding supports to the pipeline or changing the pipeline structure often cannot achieve good vibration reduction results due to the limitations of the unit's structure, which prevents the addition of supports in suitable locations or changes to the pipeline's routing and dimensions. Utility Model Content

[0003] To address the aforementioned shortcomings of existing technologies, a pipeline vibration reduction structure and a variable frequency unit are provided, which are applicable to all variable frequency and fixed frequency units and can achieve a wide-band vibration reduction effect.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: Firstly, a pipeline vibration reduction structure is applied to bent pipelines, which include a first straight section, a bend section, and a second straight section, with the first and second straight sections located on the same plane. The pipeline vibration reduction structure includes a connecting part, a first fixing member, and a second fixing member. The connecting part has a contact surface, and the entire range of the pipeline bending section is in contact with the contact surface of the connecting part. The first fixing member and the second fixing member are located on both sides of the contact surface. One side of the connecting part is fixed to the first straight section of the pipeline by the first fixing member, and the other side of the connecting part is fixed to the second straight section of the pipeline by the second fixing member.

[0005] According to the above technical solution, it also includes a first gasket, which is located between the mating surface and the bend in the pipeline.

[0006] According to the above technical solution, a bending part is provided on the connection part, and the bending part is located on the outside of the bending section of the pipeline.

[0007] According to the above technical solution, the bent part is fitted to the outer arc edge of the pipe bend section; or, the bent part is located at the edge of the pipe bend section and within the area of ​​the bend axis support at the bend end of the pipe.

[0008] According to the above technical solution, the bending part is a straight segment or an arc; the bending segment is a continuous segment or multiple segments spaced apart.

[0009] According to the above technical solution, multiple reinforcing ribs, and / or stamped grooves, and / or multiple bending structures are provided on the surface of the connection part to increase the rigidity of the connection part; the reinforcing ribs are located at the inner arc of the pipe bending section, and vibration isolation pads are provided between the reinforcing ribs and the pipe; the thickness of the connection part is not less than the thickness of the pipe.

[0010] According to the above technical solution, the fastener includes a pipe clamp and an elastic gasket, and the pipe clamp and the connecting part are fixedly connected; the pipe clamp and the connecting part are fixedly connected by bolts, welding, clips, or adhesive.

[0011] According to the above technical solution, a fixing hole is provided on the connecting part for bolt fixing connection between the pipe clamp and the connecting part; the fixing hole is configured as a slot, a waist-shaped hole or a through hole.

[0012] According to the above technical solution, a second gasket is provided between the pipe clamp and the pipe, between the first straight section of the pipe and the connecting part, and between the second straight section of the pipe and the connecting part.

[0013] Secondly, including any of the above-mentioned pipeline vibration damping structures, at the same pipeline bend, the number of the pipeline vibration damping structures is one or two; At the pipe bend containing two pipe vibration damping structures, the two pipe vibration damping structures are distributed on both sides of the pipe bend and are fixedly connected to each other.

[0014] This utility model has the following beneficial effects: 1. The entire bend in the pipeline is fitted tightly against the connecting part, with no gap between them. The connecting part and the first and second straight sections of the pipeline are then fixedly connected by a first and a second fixing component. Based on this structure, the connecting part supports and limits the bend in the pipeline, restricting the vibration amplitude at the bend. The two ends of the connecting part are fixed to the first and second straight sections of the pipeline, transmitting the vibration from the bend to the first and second straight sections at both ends, where it is gradually dissipated, thus achieving a wide-band vibration reduction effect. Furthermore, the installation of this structure is not limited by space or unit structure; it is simple in structure, requires no welding, is easy to process, has low manufacturing cost, is easy to assemble and disassemble, and is reusable. It is applicable to all pipelines of different diameters, structures, and materials, and is suitable for all variable frequency and fixed frequency units.

[0015] 2. Setting up bends not only meets the vibration reduction requirements of pipelines with high rigidity or large vibration excitation, but also significantly increases the rigidity of the pipeline bend section and limits the amplitude of the pipeline bend section, ensuring the vibration reduction effect of the pipeline.

[0016] 3. The reinforcing ribs strengthen the inner side of the pipe bend, thereby limiting the amplitude of the pipe in all directions and improving the vibration reduction effect of the pipe vibration reduction structure; in addition, the reinforcing ribs are attached to the inner arc surface of the pipe bend, which can increase the stiffness of the pipe bend.

[0017] 4. A fixing hole is provided on the connecting part for bolt fixing between the pipe clamp and the connecting part; the fixing hole is configured as a slotted hole, a waist-shaped hole, or a through hole. The slotted hole can be distributed along the slope direction of the connecting part or along the pipe diameter direction. By adjusting the position of the fixing part in all directions, deviations during pipe assembly can be accommodated, ensuring that the pipe clamp better fits the outer diameter of the straight section of the pipe, making the fixing part more stable. Furthermore, the two ends of the connecting part of the pipe vibration damping structure are provided with holes of different shapes, allowing the pipe vibration damping structure to be adapted to pipes of all diameters and different lengths simply by changing the specifications of the pipe clamp.

[0018] 5. Gaskets of elastic material are installed between the pipe bends, the first straight section, the second straight section and the connection parts, fasteners and reinforcing ribs in the pipe vibration damping structure to ensure that the outer wall of the pipe and the device are in non-rigid contact, thereby increasing the buffering effect and preventing pipe wear.

[0019] 6. Using a pipe vibration damping structure on each side of the same bend in the pipeline, and fixing the two pipe vibration damping structures together, can further improve the vibration damping effect at the pipe bend.

[0020] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0022] Figure 1 This is a schematic diagram of the existing structure; Figure 2 This is an assembly diagram of the first embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the first embodiment of the present invention; Figure 4 This is an assembly diagram of the second embodiment provided by this utility model; Figure 5 This is a structural diagram of the second embodiment of the present invention (fixing member reversed); Figure 6 This is an assembly diagram of the third embodiment provided by this utility model; Figure 7 This is an assembly diagram of the fourth embodiment provided by this utility model; Figure 8 This is a schematic diagram of the fourth embodiment of the present invention. Figure 1 ; Figure 9 This is a schematic diagram of the fourth embodiment of the present invention. Figure 2 ; Figure 10 This is an assembly diagram of the fifth embodiment provided by this utility model; Figure 11 This is a structural schematic diagram of the fifth embodiment of the present invention (the positioning hole is an inclined slot). Figure 12 This is a structural schematic diagram of the sixth embodiment of the present invention (the positioning hole is an inclined slot). Figure 13 This is a structural schematic diagram of the seventh embodiment of the present invention (the positioning hole is a groove parallel to the straight section of the pipeline); Figure 14 This is a structural schematic diagram of the eighth embodiment of the present invention (the positioning hole is an oblong hole); Figure 15This is a comparison diagram of the effects of the embodiments provided by this utility model and the prior art; In the diagram, 1 is the first straight section of the pipeline; 2 is the bend in the pipeline; 3 is the second straight section of the pipeline; 4 is the connection part; 5 is the first fastener; 6 is the second fastener; 7 is the bend; 8 is the reinforcing rib; 9 is the pipe clamp; 10 is the bolt; 11 is the slot; and 12 is the oblong hole. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 2-15 The principles and features of this utility model are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0024] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] Reference Figures 2-15 As shown, this utility model provides a pipeline vibration reduction structure.

[0027] Applied to bends in pipes, the bends in pipes include a first straight section 1, a bend section 2, and a second straight section 3, with the first straight section and the second straight section located on the same plane.

[0028] Example 1 like Figure 2-3As shown, the pipeline vibration reduction structure includes a connecting part 4, a first fixing member 5, and a second fixing member 6. The connecting part is provided with a contact surface, and the entire range of the pipeline bending section is in contact with the contact surface of the connecting part. The first fixing member and the second fixing member are located on both sides of the contact surface. One side of the connecting part is fixed to the first straight section of the pipeline by the first fixing member, and the other side of the connecting part is fixed to the second straight section of the pipeline by the second fixing member.

[0029] In the above structure, the entire bend in the pipeline is fitted onto the connecting part, with no gap between the connecting part and the bend. The connecting part and the first and second straight sections of the pipeline are fixedly connected by a first and a second fixing member. Based on this structure, the connecting part supports and limits the bend in the pipeline, restricting the vibration amplitude at the bend. The two ends of the connecting part are fixed to the first and second straight sections of the pipeline, transmitting the vibration at the bend to the first and second straight sections at both ends of the bend, where it is gradually dissipated, thus achieving a wide-band vibration reduction effect. Furthermore, this pipeline vibration reduction structure is simple in structure, easy to manufacture, and low in cost.

[0030] Example 2 Based on Example 1, a first gasket is also included. The first gasket is an elastic gasket or a gasket that plays a role in vibration isolation and buffering. The first gasket is located between the mating surface and the bend section of the pipeline to prevent wear on the bend section of the pipeline and to increase the vibration reduction effect.

[0031] Example 3 like Figure 4-11 As shown in Figures 13 and 14, based on Embodiments 1-2, in order to meet the vibration reduction requirements of pipelines with high stiffness or large vibration excitation, a bend 7 is provided on the connection part, which is located on the outside of the pipeline bend section. Furthermore, since the amplitude of vibration exhibited by the pipeline bend section is generally the largest in reality, and the stiffness is weakest at the bend section, ensuring that the bend of the pipeline vibration reduction structure is located at the edge of the pipeline bend section can significantly increase the stiffness of the pipeline bend section and limit its amplitude, thus ensuring the vibration reduction effect on the pipeline.

[0032] If it is practically impossible to ensure that the bend of the pipeline vibration damping structure is located at the edge of the pipeline bend, the bend must be located within the range from the bending axis of the pipeline bend to the edge of the bend.

[0033] Preferred, such as Figure 4-10 The bending section shown can be a straight line segment or an arc; the bending segment can be a continuous segment or multiple segments spaced apart.

[0034] Example 4 The connection parts of the pipeline vibration damping structure mainly serve as connections and supports. For pipelines with high rigidity, it is necessary to ensure that the overall pipeline vibration damping structure has sufficient rigidity for support.

[0035] Therefore, based on Examples 1-3, such as Figure 7-10 As shown, the surface of the connecting part is provided with multiple reinforcing ribs 8, and / or stamped grooves, and / or multiple bending structures to increase the rigidity of the connecting part.

[0036] For the installation of reinforcing ribs, they are generally added to the inner arc surface of the connection part of the pipeline vibration damping structure near the bend section of the pipeline. Vibration isolation materials, such as gaskets, can be used at the contact point between the pipeline and the reinforcing ribs. The reinforcing ribs strengthen the inner side of the bend section of the pipeline, thereby limiting the amplitude of the pipeline in all directions and improving the vibration damping effect of the pipeline vibration damping structure. Figure 7-10 As shown, the reinforcing ribs on the surface of the connecting part can be arc-shaped or straight, and can be one or more segments.

[0037] The thickness of the connection needs to be adjusted according to the wall thickness and rigidity of the pipeline. Generally, the thickness of the connection should not be less than the wall thickness of the pipeline.

[0038] Example 5 In embodiments 1-4, a preferred structure of the fastener is given. The fastener includes a pipe clamp 9 and an elastic gasket. The pipe clamp and the connecting part are fixedly connected. The pipe clamp and the connecting part are fixedly connected by bolts 10, welding, snap-fit, or adhesive.

[0039] The first and second fixing members are respectively fixed at the first and second straight sections of the pipeline, thereby securing both ends of the connection to these sections. The first and second fixing members can be arranged symmetrically or asymmetrically. The specific fixing positions of the first and second fixing members must be determined based on the lengths of the first and second straight sections of the pipeline, the pipeline vibration mode, and the actual vibration conditions.

[0040] The connecting part is provided with fixing holes for bolt fixing connection between the pipe clamp and the connecting part; for example Figure 11-14 As shown, the fixing holes are configured as slots 11, oblong holes 12, or through holes. As illustrated, the slots can be distributed along the slope of the connection or along the pipe diameter. By adjusting the position of the fixing components (up, down, left, and right), deviations during pipe assembly can be accommodated, ensuring better fit of the pipe clamp to the outer diameter of the straight section of the pipe, making the fixing components more stable. Furthermore, the connection ends of the pipe vibration damping structure are configured with holes of different shapes, allowing the pipe vibration damping structure to be adapted to pipes of all diameters and lengths simply by changing the specifications of the pipe clamps.

[0041] A second gasket is provided between the pipe clamp and the pipe, between the first straight section of the pipe and the connecting part, and between the second straight section of the pipe and the connecting part. The second gasket is an elastic pad or a material with vibration damping effect, ensuring that the outer wall surface of the first and second straight sections of the pipe is in non-rigid contact with the pipe clamp and the connecting part, thereby increasing the buffering effect and preventing pipe wear.

[0042] like Figure 4-5 As shown, the preferred assembly direction of the connection part of this application can be reversed, which allows the bent part to fit against the outer arc of the pipe bend section, or to be located on the back of the connection part away from the pipe to increase the rigidity of the connection part.

[0043] This utility model also provides a variable frequency drive unit, including any of the above-described pipeline vibration damping structures. Normally, one pipeline vibration damping structure is used at each pipeline bend. However, for pipelines with large internal vibration excitation, or pipelines directly connected to power sources such as compressors, if the pipeline vibration damping structure described in this application cannot achieve acceptable vibration across the entire operating frequency range, two pipeline vibration damping structures can be used on both sides of the pipeline bend; and the two pipeline vibration damping structures on both sides can be fixedly connected using bolts, clips, or welding.

[0044] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. Pipeline vibration reduction structure, applied in bent pipelines, the bent pipeline includes a first straight section, a bend section, and a second straight section, the first straight section and the second straight section are located on the same plane; Its features are: The pipeline vibration reduction structure includes a connecting part, a first fixing member, and a second fixing member. The connecting part has a contact surface, and the entire range of the pipeline bending section is in contact with the contact surface of the connecting part. The first fixing member and the second fixing member are located on both sides of the contact surface. One side of the connecting part is fixed to the first straight section of the pipeline by the first fixing member, and the other side of the connecting part is fixed to the second straight section of the pipeline by the second fixing member.

2. The pipeline vibration reduction structure according to claim 1, characterized in that: It also includes a first gasket, which is located between the mating surface and the bend in the pipe.

3. The pipeline vibration reduction structure according to claim 1, characterized in that: A bend is provided at the connection point, and the bend is located on the outside of the bend section of the pipeline.

4. The pipeline vibration reduction structure according to claim 3, characterized in that: The bend fits against the outer arc edge of the pipe bend; or, the bend is located at the edge of the pipe bend and within the area of ​​the bend axis support at the bend end of the pipe.

5. The pipeline vibration reduction structure according to claim 3 or 4, characterized in that: The bend can be a straight line or an arc; the bend can be a continuous segment or multiple segments spaced apart.

6. The pipeline vibration reduction structure according to claim 1, characterized in that: The surface of the connection part is provided with multiple reinforcing ribs, and / or stamped grooves, and / or multiple bending structures to increase the rigidity of the connection part; the reinforcing ribs are located at the inner arc of the pipe bending section, and vibration isolation pads are provided between the reinforcing ribs and the pipe; the thickness of the connection part is not less than the thickness of the pipe.

7. The pipeline vibration reduction structure according to claim 1, characterized in that: The fasteners include pipe clamps and elastic gaskets, and the pipe clamps and connecting parts are fixedly connected; the pipe clamps and connecting parts are fixedly connected by bolts, welding, clips, or adhesive.

8. The pipeline vibration reduction structure according to claim 7, characterized in that: A fixing hole is provided on the connecting part for bolt fixing connection between the pipe clamp and the connecting part; the fixing hole is configured as a slot, a waist-shaped hole or a through hole.

9. The pipeline vibration reduction structure according to claim 7, characterized in that: A second gasket is provided between the pipe clamp and the pipe, between the first straight section of the pipe and the connecting part, and between the second straight section of the pipe and the connecting part.

10. A variable frequency drive unit, characterized in that: The pipeline vibration damping structure includes any one of claims 1-9, wherein at the same pipeline bend, the number of the pipeline vibration damping structures is one or two; At the pipe bend containing two pipe vibration damping structures, the two pipe vibration damping structures are distributed on both sides of the pipe bend and are fixedly connected to each other.

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