CN108974305B

CN108974305B - Resonance silencing inter-board flow channel

Info

Publication number: CN108974305B
Application number: CN201810676527.4A
Authority: CN
Inventors: 李俊益; 李华峰; 韩灿峰; 陶海坤; 郁飞; 姚露; 王小锋; 夏俊杰
Original assignee: 719th Research Institute of CSIC
Current assignee: 719th Research Institute of CSIC
Priority date: 2018-06-27
Filing date: 2018-06-27
Publication date: 2020-06-30
Anticipated expiration: 2038-06-27
Also published as: CN108974305A

Abstract

The invention discloses a resonance muffling shipboard runner which comprises a runner body, wherein the runner body comprises a water inlet pipeline and a water outlet pipeline and is L-shaped, a pipeline and a plurality of resonant cavities are arranged in the runner body, and the resonant cavities are sequentially arranged in the runner body side by side; the pipeline is L-shaped and comprises an outer expanding pipe, a middle pipe and an output pipe which are sequentially connected, the outer expanding pipe, the middle pipe and the output pipe sequentially penetrate through each resonant cavity, an inlet is formed in the water inlet pipeline, an outlet of the output pipe penetrates out of the side wall of the water outlet pipeline, water flows enter the outer expanding pipe from the inlet and flow out of the middle pipe and the output pipe, and at least one hole is formed in the side wall of each of the middle pipe and the output pipe. The pipeline has uniform transition, no mutation, small flow resistance and excellent hydraulic performance; the transmission loss is large at low frequency, so that the noise can be effectively eliminated or attenuated; the structure resonant cavity has large volume, is easy to adjust the resonant frequency and eliminates specific frequency noise; the flow resistance is small, and a certain scouring force can be kept to prevent the opening on the pipeline from being blocked.

Description

Resonance silencing inter-board flow channel

Technical Field

The invention relates to the technical field of ship power devices, in particular to an inter-board flow channel for resonance noise elimination.

Background

The shipboard cooling water flows through the specially designed shipboard flow channel, the shipboard valve and the pump and then enters the cooling system to take away heat of each user and provide cooling for the whole ship; therefore, the design optimization of the flow passage between the shipboards is beneficial to reducing the configuration of the pump and the external radiation noise of the system, and has positive significance for improving the survival capacity of the ship.

However, the structural design of the existing flow passage between the boards still has unreasonable parts and has the following defects:

(1) the noise is large, and the environment of a working occasion is influenced;

(2) the water flow impact is large, the energy loss is large, the load of the pump is large, and the overload operation is easy.

In view of this, there is a need to improve the existing flow channel between the boards to reduce noise and reduce water flow energy loss.

Disclosure of Invention

The invention aims to solve the technical problems of high noise and serious water flow energy loss of the existing flow channel between the boards.

In order to solve the technical problem, the technical scheme adopted by the invention is to provide a resonance silencing shipboard runner, which comprises a runner body, wherein the runner body comprises a water inlet pipeline and a water outlet pipeline and is in an L shape, and the runner body is internally provided with:

the resonant cavities are sequentially arranged in the flow channel body side by side;

the pipeline is L-shaped and comprises an outer expansion pipe, a middle pipe and an output pipe which are sequentially connected, the outer expansion pipe, the middle pipe and the output pipe sequentially penetrate through the resonant cavities, the inner diameter of the outer expansion pipe is gradually reduced from a port to the inside, an inlet is formed in the water inlet pipeline, an outlet of the output pipe penetrates through the side wall of the water outlet pipeline, water flows into the outer expansion pipe from the inlet and flows out from the outlets of the middle pipe and the output pipe, and at least one hole is formed in the side walls of the middle pipe and the output pipe respectively.

In another preferred embodiment, the cross section of the water inlet pipeline is square, the central axis is a circular arc line, the water inlet pipeline is fixedly formed by an upper sealing plate and a lower sealing plate, and water flows to the middle pipe under the action of gravity after entering the outer expanding pipe.

In another preferred embodiment, the resonant cavities are separated by partitions.

In another preferred embodiment, the upper sealing plate is provided with ribs, the lower end of the partition is fixed with the lower sealing plate, and the upper end of the partition is fixed with the upper sealing plate through the ribs.

In another preferred embodiment, a grid plate is provided on the inlet.

In another preferred embodiment, the ribs are disposed along an axial direction of the inlet pipe.

In another preferred embodiment, the resonance cavity includes a first cavity, a second cavity, a third cavity, a fourth cavity and a fifth cavity which are adjacent in sequence, and the first cavity is disposed at a connecting angle between the water inlet pipe and the water outlet pipe.

In another preferred embodiment, two ends of the water inlet pipeline and the water outlet pipeline are respectively provided with a blocking plate.

Compared with the prior art, the invention has the following beneficial effects:

(1) the pipeline is uniform in overall transition, free of sudden change, small in flow resistance, capable of effectively reducing the pump head configuration and excellent in hydraulic performance;

(2) the structure of the invention ensures that the transmission loss of the sound wave at the low frequency is larger, thus effectively eliminating or attenuating the noise and having excellent acoustic performance;

(3) the resonance frequency is easy to adjust down, so that the specific frequency noise can be mainly eliminated by adjusting the area and the number of the openings on the middle pipe and the output pipe of the pipeline;

(4) the flow resistance is small, the water flow speed is high, and a certain scouring force can be kept to prevent the opening on the pipeline from being blocked.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

fig. 4 is a bottom view of fig. 1.

Detailed Description

The invention provides a resonance silencing inter-board flow channel which can reduce the pump lift and the noise generated by resonance. The invention is described in detail below with reference to the drawings and the detailed description.

As shown in fig. 1 and 3, the invention provides a resonance muffling shipboard runner, which comprises a runner body, wherein the runner body comprises a water inlet pipeline 10 and a water outlet pipeline 20, and is in an L shape, and a plurality of resonant cavities and pipelines are arranged in the runner body. A plurality of resonant cavities are arranged in the flow channel body in sequence side by side.

As shown in fig. 2 and 3, the pipe is L-shaped, the pipe includes an outer expanding pipe 41, a middle pipe 42 and an output pipe 43 connected in sequence, the outer expanding pipe 41, the middle pipe 42 and the output pipe 43 sequentially pass through each resonant cavity, the inner diameter of the outer expanding pipe 41 gradually decreases from the end to the inside, the inlet pipe 10 is provided with an inlet 13, the outlet 44 of the output pipe 43 penetrates out of the side wall of the water outlet pipe 20, the water flow enters the outer expanding pipe 41 from the inlet 13 and flows out through the middle pipe 42 and the outlet 44 of the output pipe 43, and the side walls of the middle pipe 42 and the output pipe 43 are respectively provided with at. The number of openings and the size of the apertures are set by the intermediate pipe 42 and the output pipe 43 according to different requirements of the attenuated noise and according to practical conditions.

The pipeline is L-shaped and is arranged inside the flow channel body, so that hydraulic loss caused by throttling when water flows through the pipeline can be reduced, and the port of the outer expanding pipe 41 adopts a bell-mouth-shaped gradually expanding structure to facilitate confluence. The invention forms a silencing structure with the composite characteristic of the perforated pipe and the expansion cavity by a plurality of independent resonant cavities and arranging the middle pipe 42 and the output pipe 43 with the openings, can realize the silencing effect on the noise with specific frequency by adjusting the number and the area of the openings on the pipeline, and in addition, the openings on the pipeline can also ensure the water permeability among the resonant cavities.

The working principle of the invention is as follows:

water flow enters the water inlet pipeline 10 from the inlet 13 under the action of the water pump, flows into the pipeline at the port of the outward-expanding inlet, flows out from the water outlet pipeline 20, is pressurized by the water pump and then enters the system, meanwhile, shaft frequency and blade frequency noise of the water pump are reversely transmitted by taking water as a medium and are radiated outwards from the inlet 13, and at the moment, the noise (particularly low-frequency noise) of the water pump is greatly attenuated under the action of a plurality of resonant cavities, so that the outwards radiated noise can be controlled within a certain range, and the aim of silencing is fulfilled.

The frequency of each resonant cavity is different by adjusting the area and the number of the holes on the pipeline, so that a distributed low-frequency noise elimination peak value is formed, and the low-frequency noise of the surrounding well is eliminated.

Because the pipeline transition is even and does not have the sudden change, the flow resistance is less, can effectively reduce the pump lift configuration, simultaneously because the flow resistance is less, the velocity of water flow is great, can keep certain scouring force to prevent trompil on the pipeline from being blockked up.

The invention has good hydraulic performance and acoustic performance, simple structure, simple and mature production process, convenient installation, reliability and high safety, and can adopt steel structure welding.

Preferably, the cross section of the water inlet pipe 10 is square, the central axis is a circular arc line, and the water inlet pipe is formed by fixing the upper sealing plate 11 and the lower sealing plate 12, and after entering the external expanding pipe 41, the water flows to the middle pipe 42 under the action of gravity. The shape of the inlet conduit 10 itself allows the water to flow in a trajectory under the action of gravity, reducing the load on the pump.

As shown in fig. 4, the resonant cavities are separated by the partition plates 30, and the partition plates 30 ensure the independence of the resonant cavities, and the manufacturing process is simple and reliable.

The upper sealing plate 11 is provided with ribs 31, the lower end of the partition plate 30 is fixed with the lower sealing plate 12, and the upper end is fixed with the upper sealing plate 11 through the ribs 31. The ribs 31 provide good fixing of the ribs to the upper closure plate 11, ensuring that the upper closure plate 11 and the spacer 30 are fixed relative to each other and prevent deformation.

Be equipped with the grid board on the entry 13, the grid board can shunt rivers, reduces the concentrated impact of water conservancy, reduces the loss of impact of rivers.

The ribs 31 are arranged along the axial direction of the water inlet pipeline 10 and along the radial direction of the water outlet pipeline 20, and the water inlet pipeline is formed by fixing the upper closing plate 11 and the lower closing plate 12, so that the ribs 31 are arranged in the axial direction more conveniently and meet the stress requirement more. The ribs 31 on the outlet conduit 20 are arranged along the radial direction thereof, and provide a fixed basis for the arrangement of a plurality of resonance chambers.

The resonance cavity comprises a first cavity 51, a second cavity 52, a third cavity 53, a fourth cavity 54 and a fifth cavity 55 which are adjacent in sequence, wherein the first cavity 51 is arranged at the connecting angle of the water inlet pipe 10 and the water outlet pipe 20. After water flow enters the pipeline, resonance noise reduction effect is achieved in all flow paths of turning and outputting.

The two ends of the water inlet pipeline 10 and the water outlet pipeline 20 are respectively provided with the blocking plates, the blocking plates can be manufactured according to the specific shapes of the water inlet pipeline 10 and the water outlet pipeline 20, the flexibility is high, and the limitation on the whole structure is little.

The present invention is not limited to the above-mentioned preferred embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.

Claims

1. The utility model provides a runner between board of resonance noise elimination which characterized in that, includes the runner body, the runner body includes inlet channel and outlet conduit, is L shape, the inlet channel with outlet conduit's both ends are equipped with the closure plate respectively, this internal being equipped with of runner:

the pipeline is L-shaped and comprises an outer expansion pipe, a middle pipe and an output pipe which are sequentially connected, the outer expansion pipe, the middle pipe and the output pipe sequentially penetrate through the resonant cavities, the inner diameter of the outer expansion pipe is gradually reduced from a port to the inside, an inlet is formed in the water inlet pipeline, an outlet of the output pipe penetrates out of the side wall of the water outlet pipeline, water flows into the outer expansion pipe from the inlet and flows out from the middle pipe and the output pipe, at least one hole is formed in the side wall of the middle pipe and the side wall of the output pipe respectively, the cross section of the water inlet pipeline is square, the central axis is an arc line and is formed by fixing an upper sealing plate and a lower sealing plate, and the water flows to the middle pipe under the action of gravity after entering the.

2. The resonance muffling, shipboard flow channel of claim 1, wherein the resonant cavity is separated by a baffle.

3. The resonance muffling shipboard flow channel of claim 2, wherein ribs are arranged on the upper sealing plate, the lower end of the partition plate is fixed with the lower sealing plate, and the upper end of the partition plate is fixed with the upper sealing plate through the ribs.

4. The resonance muffling, shipboard flow channel of claim 1, wherein a grid plate is disposed on the inlet.

5. The resonance muffling, shipboard flow channel of claim 3, wherein the ribs are disposed axially along the intake conduit.

6. The resonance muffling shipboard flow channel of claim 1, wherein the resonance cavity comprises a first cavity, a second cavity, a third cavity, a fourth cavity and a fifth cavity which are adjacent in sequence, and the first cavity is arranged at a connecting angle of the water inlet pipeline and the water outlet pipeline.