Back pressure type vibration isolator

Abstract

The utility model relates to the technical field of vibration isolators, in particular to a back pressure type vibration isolator which comprises a bottom shell, a positioning seat fixedly connected to the lower portion of the inner side of the bottom shell, a compression spring fixedly connected to the outer side of the top of the positioning seat, a top cover fixedly connected to the end, away from the positioning seat, of the compression spring, and a fixing disc fixedly connected to the middle of the top of the positioning seat. A steel pipe is slidably connected to the inner side of the top cover, a flange plate is fixedly connected to the outer side of the top end of the steel pipe, a hard pipe is arranged on the inner side of the steel pipe, and a damping layer is fixedly connected to the inner wall of the hard pipe; through design cooperation, the damping layer can be adjusted to the required damping ratio according to the requirement, the length of the steel pipe depends on the length of the damping layer, the damping ratio of the vibration isolator is adjusted by adjusting the length of the steel pipe and the damping size, operation of controllable and adjustable damping and controllable and adjustable rigidity can be achieved, and high universality is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration isolators, and particularly relates to a back-pressure vibration isolator. Background Technique

[0002] The back-pressure vibration isolator is a specially designed vibration isolation device. It can not only isolate and reduce the transmission caused by vibration of mechanical equipment or structures, but also effectively balance and relieve the pressure fluctuations generated due to the operation of the equipment;

[0003] The back-pressure vibration isolator usually has the following characteristics. Pressure balance function: The back-pressure vibration isolator usually contains one or more back-pressure tubes or other fluid channels inside. These channels allow fluid to flow between both sides of the vibration isolator, thereby balancing the pressure difference, which can prevent the performance degradation or damage of the vibration isolator caused by the pressure difference; Vibration isolation effect: The back-pressure vibration isolator absorbs and isolates vibration through elastic elements, reducing the transmission of vibration from the equipment to the foundation structure or from the foundation structure to the equipment.

[0004] When the existing back-pressure vibration isolators are in use, for different equipment or structures, their vibration frequencies may vary greatly. For example, high-speed rotating equipment will generate high-frequency vibrations, while heavy-duty equipment may generate low-frequency vibrations, and the magnitudes of the vibration amplitudes also vary due to differences in equipment or structures. Some equipment may generate tiny vibrations, while others may generate violent vibrations. Moreover, it is difficult to adjust the damping ratio of the back-pressure vibration isolators on the market. Different types and damping ratios of back-pressure vibration isolators are required for different vibrations generated by different equipment, and the versatility is poor.

[0005] To solve the above problems, a back-pressure vibration isolator is proposed in this application. Content of the Utility Model

[0006] To solve the problems raised in the above background technique. The utility model provides a back-pressure vibration isolator, which can adjust the damping ratio and the length of the steel pipe, and has the characteristics of quickly replacing damping layers with different lengths according to the lengths of different steel pipes.

[0007] To achieve the above object, the utility model adopts the following technical scheme: A back-pressure vibration isolator, including a bottom shell, a positioning seat is fixedly connected to the lower part inside the bottom shell, a compression spring is fixedly connected to the outer side of the top of the positioning seat, a top cover is fixedly connected to the end of the compression spring away from the positioning seat, a fixed disk is fixedly connected to the middle of the top of the positioning seat, a back-pressure tube is fixedly connected to the top of the fixed disk, a steel pipe is slidably connected to the inside of the top cover, a flange plate is fixedly connected to the outer side of the top end of the steel pipe, a hard tube is arranged inside the steel pipe, and a damping layer is fixedly connected to the inner wall of the hard tube.

[0008] Preferably, as a counter-pressure type vibration isolator of the present utility model, the inner wall of the bottom shell contacts the outer side of the compression spring, the bottom edge of the flange plate contacts the top of the top cover, and the outer side of the counter-pressure pipe contacts the inner wall of the damping layer, which allows the damping layer to be adjusted to the required damping ratio according to needs. The damping ratio of the vibration isolator can also be adjusted by adjusting the length of the steel pipe and the damping magnitude, realizing the operation of controllable and adjustable damping and stiffness, and having strong versatility.

[0009] Preferably, as a counter-pressure type vibration isolator of the present utility model, the bottom shell is provided with a groove from top to bottom, and the cross-sectional diameter of the groove matches the cross-sectional diameter of the bottom of the top cover. The positioning seat and the compression spring are both arranged in the groove, which allows the top cover to drive the steel pipe and the damping layer to perform vibration reduction operation inside the bottom shell.

[0010] Preferably, as a counter-pressure type vibration isolator of the present utility model, a through hole is provided in the middle of the top cover, and the diameter of the through hole in the middle of the top cover matches the cross-sectional diameter of the steel pipe. The cross-sectional diameter of the flange plate is 1.5 times larger than the cross-sectional diameter of the steel pipe, for adjusting the length of the steel pipe and quickly replacing the steel pipe without removing the top cover.

[0011] Preferably, as a counter-pressure type vibration isolator of the present utility model, internal threads are provided on the inner wall of the steel pipe, external threads are provided on the surface of the hard pipe, and an adhesive layer is provided on the surface of the hard pipe. The internal threads on the inner side of the steel pipe are helically engaged with the external threads on the outer side of the hard pipe, and different lengths of damping layers can be quickly replaced according to the lengths of different steel pipes.

[0012] Preferably, as a counter-pressure type vibration isolator of the present utility model, the cross-sectional diameter of the steel pipe matches the cross-sectional diameter of the hard pipe, and the cross-sectional diameter of the hard pipe matches the cross-sectional diameter of the damping layer on the inner wall of the hard pipe. The pitch of the external threads matches the pitch of the internal threads. The helix between the internal threads and the external threads, combined with the adhesion of the adhesive layer, can prevent the counter-pressure pipe from driving the damping layer and the hard pipe to slide up and down inside the steel pipe due to friction when the counter-pressure pipe slides up and down inside the damping layer.

[0013] Preferably, as a counter-pressure type vibration isolator of the present utility model, the number of the adhesive layers is two groups, and the adhesive layers are distributed on the upper and lower sides of the surface of the hard pipe, and the outer sides of the adhesive layers are adhesively connected to the upper and lower sides of the inner wall of the steel pipe at the same time. As an auxiliary structure between the hard pipe and the steel pipe, the adhesive layer can fix the hard pipe on the inner wall of the steel pipe, preventing the hard pipe from rotating on the inner wall of the steel pipe and thus avoiding the situation that the hard pipe detaches from the steel pipe.

[0014] The present utility model has the following beneficial effects:

[0015] The anti-pressure vibration isolator designed by the utility model enables the device to adjust the damping layer to the required damping ratio according to needs through design cooperation. The length of the steel pipe depends on the length of the damping layer. By adjusting the length of the steel pipe and the damping magnitude, the damping ratio of the vibration isolator can be adjusted, realizing the operations of controllable and adjustable damping and controllable and adjustable stiffness, and having strong versatility.

[0016] The anti-pressure vibration isolator designed by the utility model enables the device to quickly replace damping layers with different lengths according to the lengths of different steel pipes through design cooperation. A rigid pipe is arranged outside the damping layer, and external threads are arranged on the surface of the rigid pipe, which are spirally engaged with the internal threads on the inner wall of the steel pipe. The upper and lower sides of the rigid pipe are adhered with an adhesive layer. It can not only quickly adjust and cut the rigid pipe and the damping layer inside the steel pipe according to the length of the steel pipe, but also, when the anti-pressure pipe slides up and down inside the damping layer, the spiral between the internal threads and the external threads, combined with the adhesion of the adhesive layer, can prevent the anti-pressure pipe from driving the damping layer and the rigid pipe to slide up and down inside the steel pipe due to friction, improving the stability of the damping layer on the inner wall of the steel pipe to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide further understanding of the utility model and constitute a part of the specification. They are used together with the embodiments of the utility model to explain the utility model, but do not constitute a limitation to the utility model. In the drawings:

[0018] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 is a three-dimensional schematic diagram of the overall longitudinal section of the utility model;

[0020] Figure 3 is a three-dimensional exploded view of the steel pipe of the utility model;

[0021] Figure 4 is a three-dimensional schematic diagram of the longitudinal section of the rigid pipe of the utility model.

[0022] LEGEND DESCRIPTION:

[0023] 1. Bottom shell; 2. Compression spring; 3. Top cover; 4. Steel pipe; 5. Flange; 6. Damping layer; 7. Positioning seat; 8. Fixed disk; 9. Anti-pressure pipe; 10. Internal thread; 11. Rigid pipe; 12. External thread; 13. Adhesive layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] Embodiment 1

[0026] As Figures 1-4 shown;

[0027] A backpressure vibration isolator includes a bottom shell 1.

[0028] In this implementation: When the existing backpressure vibration isolator is in use, for different devices or structures, their vibration frequencies may vary greatly. For example, high-speed rotating devices will generate high-frequency vibrations, while heavy-duty devices may generate low-frequency vibrations, and the magnitudes of the vibration amplitudes also vary due to differences in devices or structures. Some devices may generate small vibrations, while others may generate intense vibrations. Moreover, it is difficult to adjust the damping ratio of the backpressure vibration isolators on the market. When different devices generate different vibrations, backpressure vibration isolators of different models and different damping ratios need to be used, and their versatility is poor. In terms of combined use, this problem is obviously an existing and difficult-to-solve problem. In view of this, to solve this technical problem, a steel pipe 4 and a rigid pipe 11 are added to this application document;

[0029] Furthermore:

[0030] As Figures 1 through 4 shown:

[0031] Combining the above content: A backpressure vibration isolator includes a bottom shell 1. A positioning seat 7 is fixedly welded below the inner side of the bottom shell 1. A compression spring 2 is welded to the outer side of the top of the positioning seat 7. One end of the compression spring 2 away from the positioning seat 7 is welded to a top cover 3. A fixed disk 8 is welded to the middle of the top of the positioning seat 7. A backpressure pipe 9 is welded to the top of the fixed disk 8. The steel pipe 4 penetrates and slides through the inner side of the top cover 3. A flange 5 is welded to the outer side of the top end of the steel pipe 4. A rigid pipe 11 is arranged inside the steel pipe 4. A damping layer 6 is arranged on the inner wall of the rigid pipe 11. The inner wall of the bottom shell 1 contacts the outer side of the compression spring 2. The bottom edge of the flange 5 contacts the top of the top cover 3. The outer side of the backpressure pipe 9 contacts the inner wall of the damping layer 6.

[0032] In this embodiment: The damping layer 6 can be adjusted to the required damping ratio according to needs, and the damping ratio of the vibration isolator can also be adjusted by adjusting the length of the steel pipe 4 and the damping magnitude. Operations of controllable and adjustable damping and controllable and adjustable stiffness can be achieved, and it has strong versatility.

[0033] In an alternative embodiment: The bottom shell 1 is provided with a groove extending from top to bottom, and the cross-sectional diameter of the groove matches the cross-sectional diameter of the bottom of the top cover 3. The positioning seat 7 and the compression spring 2 are both arranged in the groove.

[0034] In this embodiment: The top cover 3 can drive the steel pipe 4 and the damping layer 6 to perform vibration reduction operations inside the bottom shell 1.

[0035] In an alternative embodiment: A through hole is provided in the middle of the top cover 3, and the diameter of the through hole in the middle of the top cover 3 matches the cross-sectional diameter of the steel pipe 4. The cross-sectional diameter of the flange 5 is 1.5 times larger than the cross-sectional diameter of the steel pipe 4.

[0036] In this embodiment: It is used to adjust the length of the steel pipe 4 and quickly replace the steel pipe 4 without removing the top cover 3.

[0037] According to the above, in order to quickly replace the damping layer 6 with different lengths according to the length of different steel pipes 4, it further includes an internal thread 10 provided on the inner wall of the steel pipe 4, an external thread 12 provided on the surface of the rigid pipe 11, an adhesive layer 13 provided on the surface of the rigid pipe 11, and the internal thread 10 on the inner side of the steel pipe 4 is helically engaged with the external thread 12 on the outer side of the rigid pipe 11.

[0038] In this implementation scheme: The damping layer 6 with different lengths can be quickly replaced according to the length of different steel pipes 4.

[0039] In an alternative embodiment: The cross-sectional diameter of the steel pipe 4 matches the cross-sectional diameter of the rigid pipe 11, and the cross-sectional diameter of the rigid pipe 11 matches the cross-sectional diameter of the damping layer 6 on the inner wall of the rigid pipe 11. The pitch of the external thread 12 matches the pitch of the internal thread 10.

[0040] In this embodiment: The helical engagement between the internal thread 10 and the external thread 12, combined with the adhesion of the adhesive layer 13, can prevent the counter-pressure pipe 9 from driving the damping layer 6 and the rigid pipe 11 to slide up and down inside the steel pipe 4 due to friction when the counter-pressure pipe 9 slides up and down inside the damping layer 6.

[0041] In an alternative embodiment: The number of the adhesive layers 13 is two groups. The adhesive layers 13 are distributed on the upper and lower sides of the surface of the rigid pipe 11, and the outer sides of the adhesive layers 13 are adhesively connected to the upper and lower sides of the inner wall of the steel pipe 4 at the same time.

[0042] In this embodiment: The adhesive layer 13 serves as an auxiliary structure between the rigid pipe 11 and the steel pipe 4, which can fix the rigid pipe 11 on the inner wall of the steel pipe 4 and prevent the rigid pipe 11 from rotating on the inner wall of the steel pipe 4, thereby avoiding the situation where the rigid pipe 11 detaches from the steel pipe 4.

[0043] Working principle and usage process of the utility model: During use, adjust the lengths of the steel pipe 4 and the damping layer 6 according to the equipment to be isolated by the back-pressure vibration isolator. If the vibration is relatively slight, a shorter steel pipe 4 can be selected. Take out the steel pipe 4 and the rigid pipe 11. The damping layer 6 has been pre-assembled inside the rigid pipe 11. Then align the external thread 12 on the surface of the rigid pipe 11 with the internal thread 10 inside the steel pipe 4 until the external thread 12 and the internal thread 10 are in spiral contact. Start rotating the steel pipe 4. The steel pipe 4 sleights the rigid pipe 11 and moves downward along the steel pipe 4 until the bottom end of the rigid pipe 11 is flush with the bottom end of the steel pipe 4, then stop rotating. Take out the cutting tool and cut along the top of the flange 5 at the top of the steel pipe 4. After cutting the rigid pipe 11, take out the adhesive layer 13 and evenly apply it to the contact points between the top and bottom of the steel pipe 4 and the rigid pipe 11. After assembly and air drying, insert the steel pipe 4 into the middle inside the top cover 3 from top to bottom. At this time, the inner wall of the damping layer 6 contacts the surface of the back-pressure pipe 9 at the top of the positioning seat 7 inside the bottom shell 1 until the bottom of the flange 5 contacts the top of the top cover 3. Then use bolts to fix the flange 5 to the top of the top cover 3. The back-pressure vibration isolator is installed. Install the bottom shell 1 and the top cover 3 at the vibration points of the equipment respectively. When the equipment vibrates, the compression spring 2 inside the bottom shell 1 and the damping layer 6 outside the back-pressure pipe 9 perform vibration isolation operations; if the vibration of the equipment is relatively intense, the lengths of the steel pipe 4, the rigid pipe 11 and the damping layer 6 can be selected to be increased, and the installation operation is the same as above.

[0044] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A back-pressure vibration isolator, comprising a bottom shell (1), characterized in that: A positioning seat (7) is fixedly connected to the lower part inside the bottom shell (1). A compression spring (2) is fixedly connected to the outer side of the top of the positioning seat (7). One end of the compression spring (2) away from the positioning seat (7) is fixedly connected to a top cover (3). A fixing plate (8) is fixedly connected to the middle of the top of the positioning seat (7). A back-pressure pipe (9) is fixedly connected to the top of the fixing plate (8). A steel pipe (4) is slidably connected to the inside of the top cover (3). A flange plate (5) is fixedly connected to the outer side of the top end of the steel pipe (4). A rigid pipe (11) is arranged inside the steel pipe (4). A damping layer (6) is fixedly connected to the inner wall of the rigid pipe (11).

2. The anti-pressure vibration isolator according to claim 1, characterized in that: The inner wall of the bottom shell (1) is in contact with the outer side of the compression spring (2). The bottom edge of the flange plate (5) is in contact with the top of the top cover (3). The outer side of the back-pressure pipe (9) is in contact with the inner wall of the damping layer (6).

3. The anti-pressure vibration isolator according to claim 1, characterized in that: The bottom shell (1) is provided with a groove from top to bottom, and the cross-sectional diameter of the groove is matched with the cross-sectional diameter of the bottom of the top cover (3). The positioning seat (7) and the compression spring (2) are both arranged in the groove.

4. A back-pressure vibration isolator according to claim 1, characterized in that: A through hole is formed in the middle of the top cover (3), and the diameter of the through hole in the middle of the top cover (3) is matched with the cross-sectional diameter of the steel pipe (4). The cross-sectional diameter of the flange plate (5) is 1.5 times larger than the cross-sectional diameter of the steel pipe (4).

5. The anti-pressure vibration isolator according to claim 1, characterized in that: Internal threads (10) are formed on the inner wall of the steel pipe (4). External threads (12) are formed on the surface of the rigid pipe (11). An adhesive layer (13) is arranged on the surface of the rigid pipe (11). The internal threads (10) inside the steel pipe (4) are spiraled with the external threads (12) on the outer side of the rigid pipe (11).

6. The anti-pressure vibration isolator according to claim 5, characterized in that: The cross-sectional diameter of the steel pipe (4) is matched with the cross-sectional diameter of the rigid pipe (11), and the cross-sectional diameter of the rigid pipe (11) is matched with the cross-sectional diameter of the damping layer (6) on the inner wall of the rigid pipe (11). The pitch of the external threads (12) is matched with the pitch of the internal threads (10).

7. The anti-pressure vibration isolator according to claim 5, characterized in that: The number of the adhesive layers (13) is two groups. The adhesive layers (13) are distributed on the upper and lower sides of the surface of the rigid pipe (11), and the outer sides of the adhesive layers (13) are adhesively connected to the upper and lower sides of the inner wall of the steel pipe (4) at the same time.

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