KR100800078B1 - Hydraulic pulsation reduction device of side branch - Google Patents

Abstract

A branched side branch with a closed end is branched to a discharge pipe such as a hydraulic pump / motor, and pulsation of fluid discharged from the hydraulic pump / motor is propagated into the discharge pipe, and at the same time, In the process of pulsation propagating through the partitioned passage and reflecting back from the wall of the terminal, it is a physical phenomenon caused by the mutual interference of the pulsating waves. In that,

The side branch type hydraulic pulsation reducing device of the present invention has a connecting pipe connected in communication with a main pipe for moving hydraulic fluid discharged from a fluid power source, and an inlet connected to the connecting pipe and the outlet is closed to form an outer wall. And a bent inner pipe partition partitioning the plurality of fluid passages within the housing to induce interference of wavelengths to absorb pulsations of the fluid passing through the main pipe.

Hydraulic, pulsation reducer, frequency, side branch

Description

Hydraulic pulsation reduction device of side branch

1 is an excerpt excerpt of the hydraulic pulsation reduction device according to the prior art,

2 is an excerpt excerpt of the side branch type hydraulic pulsation reducing device according to the present invention;

Figure 3 is a state of use of the side branch type hydraulic pulsation reducing device according to the present invention,

Figure 4 is a cross-sectional view of the upper end of the block-type housing in the side branch type hydraulic pulsation reduction device according to the present invention.

* Explanation of symbols used in the main part of the drawing

10; Main pipe

11; Connector

12; housing

13; Bulkhead for internal piping

14; Air drain plug

A to G; Fluid passage

According to the present invention, a branched side branch having a closed end is connected to a discharge pipe such as a hydraulic pump / motor, and the discharge pipe is formed by a bent internal pipe that divides the side branch into a plurality of areas. The present invention relates to a side branch hydraulic pulsation reducing device capable of reducing pulsation of a moving fluid by interference of wavelengths.

More specifically, the pulsation of the fluid discharged from a power source such as a hydraulic pump propagates into the discharge pipe, and at the same time propagates through the passage inside the side branch, is reflected from the wall of the terminal and the mutual interference action The present invention relates to a side branch type hydraulic pulsation reducing device capable of reducing a pulsation of a specific frequency among pulsations of a fluid moving along a discharge pipe due to a physical phenomenon caused by the phenomena.

In general, a power source such as an engine / hydraulic pump / motor generates periodic fluctuations in flow rate or pressure, such as pulsation, in a piping system through which fluid flows due to discontinuous discharge characteristics.

This pulsation phenomenon is to be transmitted to the outside by vibration or noise by exciting the pipe wall by excessive energy fluctuations of itself, and as a method of reducing this, a separate branch type using the interference phenomenon of the wavelength in the main distribution system in which the fluid flows. Apparatuses for connecting pipes to absorb the energy have been applied.

As shown in FIG. 1, the hydraulic pulsation reduction apparatus according to the related art has a main pipe 1 for moving a fluid discharged from a hydraulic motor / pump or the like driven and connected to an engine, and a branch connection to the main pipe 1. And a side branch 2 having a closed end to absorb the fluid energy and to monitor the pulsation of the fluid.

At this time, the distance between the branch point and the end from the main pipe (1) corresponding to the length (L) of the side branch (2) is formed to have a length of 1/4 of the frequency wavelength of the pulsation to make noise (消) This is preferred.

The conventional hydraulic pulsation reducing device has a problem that the piping length of the branched side branch 2 becomes long when the frequency of the pulsation is low and high pressure, and the space is secured, and when the high pressure hose is difficult to bend, It is impossible to apply to a narrow space of the equipment and a hydraulic hose or a pipe having a special structure is required to cope with high pressure, which causes a problem of increased cost and manufacturing cost.

Accordingly, an object of the present invention is to provide an excavator according to a high pressure and a compact by applying to a high pressure and a limited space by a bent internal pipe that divides and forms an internal space of a side branch branched to a discharge pipe such as a hydraulic motor / pump. To provide a side branch-type hydraulic pulsation reducing device that can meet the characteristics of the competitive advantage in the same field.

It is another object of the present invention to provide a side branch type hydraulic pulsation reducing device which can prevent the fatigue destruction of the corresponding parts due to the accumulation of noise and piping vibration of the entire equipment, thereby increasing the service life of heavy equipment by increasing the durability. .

Another object of the present invention, since the operating pressure flowing inside the side branch is canceled by being pressed in opposite directions to each other to prevent the additional cost generated by the need for a separate hydraulic hose or piping according to the high pressure, the appearance of the side branch It is to provide a side-branch hydraulic pulsation reduction device that can reduce pulsation over long wavelengths in a narrow space by reducing the volume.

The object of the present invention described above is a connecting pipe connected in communication with the main pipe for moving the hydraulic fluid discharged from the fluid power source,

A block-shaped housing in which an inlet is branched to the connecting pipe and the outlet is closed to form an outer wall;

And a side branch type hydraulic pulsation reducing device having a bent inner pipe partition partitioning the plurality of fluid passages inside the housing to induce interference of wavelengths to absorb pulsations of the fluid passing through the main pipe. By providing.

According to a preferred embodiment, it is provided to be opened and closed on the upper surface of the housing, it is provided with an air discharge plug for discharging the air flowing into the fluid passage formed by the partitioned partition for the internal pipe bent to the outside.

In addition, the bent inner pipe partition wall is alternately and repeatedly attached to the top and bottom surfaces of the housing to form a "S" -shaped fluid passage inside the housing.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to explain in detail enough to enable those skilled in the art to easily practice the present invention. This does not mean that the technical spirit and scope of the present invention is limited.

2 to 4, the side branch type hydraulic pulsation reducing device according to the present invention moves hydraulic oil discharged from a fluid power source such as a hydraulic motor / pump (not shown) connected to an engine and driven. A connecting pipe 11 connected in communication with the main pipe 10, a block-shaped housing 12 having an inlet connected to the connecting pipe 11 and having an outlet closed to form an outer wall;

A plurality of S-shaped fluid passages A, B, C, D, E, F, and G are formed in the housing 12 to absorb pulsations of the fluid passing through the main pipe 10. A bent inner pipe partition 13 is repeatedly attached to the top and bottom surfaces of the housing 12 alternately and repeatedly to induce interference of the wavelength.

At this time, the upper surface of the housing 12 is formed to be opened and closed, the air discharge to discharge the air flowing into the fluid passage (A to G) formed by the partitioned partition 13 for the inner pipe bent to the outside The plug 14 is provided.

Hereinafter, the operation of the side branch type hydraulic pulsation reducing device according to the present invention will be described in more detail with reference to the accompanying drawings.

The hydraulic oil discharged from the hydraulic pump or the hydraulic motor connected to the engine is supplied to the actuator such as the hydraulic cylinder for boom driving through the main pipe 10 so that the working device such as the boom and the arm can be driven to continuously excavate and load the car. It can be done.

At this time, as shown in Figure 3 and 4, the "S" shaped fluid passage (A to S) in the block-shaped housing 12 connected to the connection pipe 11 connected to the main pipe (10) The pulsation of the fluid passing through the main pipe 10 can be reduced by the bent inner pipe partition 13 which is alternately repeatedly attached to the top and bottom surfaces of the housing 12 to form G).

That is, the pulsation of the fluid discharged from the hydraulic motor or the hydraulic pump is composed of a fundamental frequency and a higher order component.

As shown in FIG. 3, the pulsation of the hydraulic oil discharged from the hydraulic pump or the hydraulic motor propagates into the main pipe 10, and at the same time, the pulsation of the hydraulic oil passing through the main pipe 10 branches into the connecting pipe 11. When propagated into the connected block-shaped housing 12, the fluid passage moves along the "S" shaped fluid passage (A-G) formed by the inner pipe partition 13 and is reflected from the wall surface. Return to the main pipe 10 along (G → A).

At this time, as shown in Figure 4, the frequency corresponding to the 1/4 wavelength of the branched pipe length is 180 degrees phase change occurs, the frequency corresponding to the 1/4 wavelength of the length formed in the main pipe 10 Since a physical phenomenon occurs that interferes with the component and is removed, pulsation is removed from the pipe downstream of the housing 12.

In this way, when the pulsation wave of a specific frequency to be reduced is determined in advance and the length of the fluid passage in the side branch is appropriately adjusted according to the frequency, the pulsation wave of the hydraulic fluid moving and returning along the passage is advanced in the main pipe. It is possible to effectively reduce the pulsation at a specific frequency among the pulsations moving forward in the main pipe by interfering with the principle that the moving pulsating wave and the wave valley and the acid collide.

At this time, as the specific frequency, for example, in the case of excavation work using an excavator, it is a hydraulic pump pulsation frequency (150 to 1000 Hz) corresponding to the engine speed.

Accordingly, the side branch type hydraulic pulsation reducing device according to the present invention has a length corresponding to 1/4 wavelength of the fundamental frequency of the fluid pulsation discharged to the hydraulic operation source to form an internal pipe of a bent shape rather than a simple hose or straight pipe. It is possible to reduce the pulsation of the fluid by a separate block.

On the other hand, the side branch type hydraulic pulsation reducing device according to the present invention has been described as an example that is installed in the hydraulic oil discharge pipe, such as a hydraulic pump / motor, but used in the air supply pipe of the intake system for supplying air to the engine It goes without saying that the present invention may be modified and applied within the technical scope of the present invention (not shown in the drawings).

As described above, the side branch hydraulic pulsation reducing device according to the present invention has the following advantages.

The bent inner pipe divides the inner space of the side branch with the end branch connected to the hydraulic oil discharge pipe, so it can be applied to high pressure and limited space to meet the characteristics of the excavator due to the high pressure and compactness. Will be competitive.

In addition, it is possible to extend the service life of heavy equipment by increasing the durability by preventing fatigue destruction of the corresponding parts due to noise and pipe vibration accumulation of the entire equipment.

In addition, since the operating pressure flowing inside the side branch is canceled by being pressed in opposite directions to each other to prevent the additional cost caused by the need for a separate hydraulic hose or piping according to the high pressure to reduce the spacing of the partition wall between the inner pipe. As a result, the outer volume of the side branch can be reduced to significantly reduce the pulsation of a long wavelength even in a narrow space.

Claims (3)

A connecting pipe connected in communication with the main pipe for moving the hydraulic oil discharged from the fluid power source; A block-shaped housing having an inlet connected to the connecting pipe and having an outlet closed to form an outer wall; And A side branch-type hydraulic pulsation reducing device, characterized in that it comprises a partition for forming a plurality of fluid passages in the housing and bends the inner pipe for inducing interference of the wavelength to absorb the pulsation of the fluid passing through the main pipe. According to claim 1, It is formed on the upper surface of the housing and provided with an air discharge plug for discharging the air flowing into the fluid passage formed by the partitioned partition for the internal pipe bent to the outside to the outside. Side branch type hydraulic pulsation reducing device. The side branch type of claim 1, wherein the bent inner pipe partition wall is alternately and repeatedly attached to the top and bottom surfaces of the housing to form an “S” -shaped fluid passage within the housing. Hydraulic pulsation reduction device.

Images