JPH07545U - High pressure water jet nozzle cartridge - Google Patents

Abstract

(57) [Abstract] [Purpose] To supply high-pressure water to multiple jet nozzles, the flow path must be bent, but the water jet spraying from the nozzles close to the bend will reduce the machining ability. I was known. The present invention aims to jet a water jet of equal pressure from all nozzles. [Structure] The distance from the intersection of the upstream flow channel and the branch flow channel to the nearest nozzle center is at least twice the cross-sectional diameter of the branch flow channel.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a cartridge having a rectangular cross section in which a large number of high-pressure water jet nozzles are arranged and mounted in a plurality of rows and which oscillate in a circular orbit.

[0002]

[Prior art]

 When spraying high-pressure water to peel off and wash coatings and deposits on concrete wall surfaces or to polish stone surface, it is necessary to spray high-pressure water as evenly as possible onto the surface of the object. On the other hand, a high-pressure pump that supplies high-pressure water has a limited amount of water to be jetted. Therefore, several small-diameter jet nozzles are attached to the cartridge, and the cartridge moves in a circular motion at high speed. A method of injecting high-pressure water with as little space as possible inside is in practical use. As for the mechanism in which the nozzle cartridge oscillates in a circular motion at high speed, Japanese Patent Application No. 56-126163 and Japanese Patent Application No. 62-313170 have been proposed.

FIG. 3 shows an example of a cartridge having a circular cross section, and FIG. 4 shows an example of a cartridge having a rectangular cross section. FIG. 3 shows a cartridge mounted on the tip of a hand-held injection gun, in which seven nozzles are mounted at positions 20 symmetrical with respect to the center of the circle. As shown in FIG. 5, when the cartridge moves in the direction of the arrow while oscillating at a high speed in a circular orbit of radius r, a high-pressure water jet is sprayed over the entire surface of the band-shaped region having the width W without any gap. However, the jet density of the water jet is not uniform and linear unevenness occurs in the processing result. Depending on the direction of movement, there will be a zone where no water jet is jetted. Therefore, this cartridge is attached to a hand-held gun, and the operator can freely move the gun so that the machining results are even and visually visible.

FIG. 4 shows a cartridge to be attached to the tip of a self-propelled injection gun, in which 24 nozzles are arranged in a staggered manner in four rows at equal intervals and with the positions 20 slightly shifted in each row. That is, since the nozzle arrangement density in the entire row is uniform, this cartridge moves at a constant speed in the direction of the arrow while swinging at high speed in a circular trajectory of radius r as shown in FIG. Then, the high-pressure water jet is sprayed on the entire surface of the band-shaped region having the width W without any gap, and the spray density is substantially uniform in the entire region.

In order to use the nozzle arrangement shown in FIG. 4, a cartridge having a structure as shown in FIGS. 7 and 8 has conventionally been used. This cartridge is attached to the tip of the injection gun with a screw 17, and 24 nozzles having a small diameter injection port are attached with the screw 10. The high-pressure water flows from the inlet flow path 16 into the upstream flow path 13 as shown by the arrow, further flows into the branch flow path 12, is distributed to the 24 discharge ports 11, and is jetted from the nozzles attached by the screws 10. It is jetted as a water jet from the mouth.

[0006]

[Problems to be solved by the device]

 However, in the cartridges of FIGS. 7 and 8, there is a tendency that a processing-deficient region is likely to occur in the central portion of the band-shaped processing region shown in FIG. Then, in FIG. 7, the jet pressure of the water jet jetted from the nozzle located in the vicinity of the bent portion of the flow passage where the upstream flow passage 13 and the branch flow passage 12 intersect, that is, the nozzle attached to the discharge port indicated by reference numeral A It was observed that it was declining, which was found to be the cause of the lack of processing. It can be presumed that such a pressure drop is due to the pressure loss due to the turbulent flow in the bent portion of the flow path.

[0007]

[Means for solving the problem]

 In the present invention, in order to equalize the jet pressure of the water jet for all of the multiple nozzles, the multiple nozzles that jet high-pressure water are arranged in multiple rows, and the nozzle arrangement density in the row direction is equalized. In the nozzle cartridge, all nozzles are arranged at positions separated by at least twice the diameter of the branch channel from the intersection of the upstream channel supplying the high-pressure water and the branch channel.

[0008]

【Example】

 An example of a nozzle cartridge according to the present invention is shown in FIGS. It is the same as in FIGS. 7 and 8 that the cartridge is attached to the tip of the injection gun by the screw 17 and the 24 nozzles having a small diameter injection port are attached by the screw 10, but the high pressure water supply passage The structure is different. That is, the high-pressure water flows from the inlet flow path 16 into the main flow path 15 as shown by the arrow, then further flows into the branch flow path 12 via the upstream side flow path 13, and is distributed to the 24 discharge ports 11 and screwed. Water is jetted from the jet port of the nozzle attached by 10. Here, the distance from the intersection 14 between the upstream flow path 13 and the branch flow path 12 to the center of the cross section of the closest outlet A is set to be at least twice the cross-sectional diameter of the branch flow path 12. Then, this distance is such that the larger the flow velocity of the high-pressure water passing through the intersection 14, the larger the magnification with respect to the cross-sectional diameter of the branch flow passage 12.

According to this cartridge, the influence of the turbulent flow at the flow path crossing portion 14 does not reach the discharge port A, and no pressure loss occurs. Therefore, the injection pressure of the water jet sprayed from the nozzle attached to the discharge port A is also increased. Does not fall. Therefore, the entire surface of the band-shaped processing region shown in FIG. 6 can be processed uniformly.

[0010]

[Brief description of drawings]

FIG. 1 is a plan view of a cartridge according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a nozzle layout view of a cartridge having a circular cross section.

FIG. 4 is a nozzle layout view of a cartridge having a rectangular cross section.

FIG. 5 is a water jet injection locus in FIG.

FIG. 6 is a water jet injection trajectory according to FIG.

FIG. 7 is a plan view of a cartridge having a conventional structure.

FIG. 8 is a side view of the above.

[Explanation of symbols]

 11 Discharge port 12, 13, 15, 16 Flow path 14 Flow path intersection 20 Nozzle position

[Procedure amendment]

[Submission date] July 27, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Scope of utility model registration request

[Correction method] Change

[Correction content]

[Scope of utility model registration request]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadaharu Hagiwara 2-15-14 Minamisuna, Koto-ku, Tokyo Inside the Takenaka Corporation Technical Research Institute (72) Haruo Hoshino 2-15, Minamisuna, Koto-ku, Tokyo No. 14 Incorporated Takenaka Corp. Technical Research Institute (72) Inventor Tadashi Hayakawa 21-21 Ginza, Chuo-ku, Tokyo Incorporated Takenaka Corp. Tokyo Main Store (72) Inventor Shinagawa Eikichi Shinagawa-ku, Tokyo North 5-3-20 Shinagawa Ako Engineering Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A nozzle cartridge in which a large number of nozzles for injecting high-pressure water are arranged in a plurality of rows, and the nozzle arrangement density is uniform in the row direction, in which an upstream side channel and a branch channel for supplying high-pressure water are provided. A high-pressure water jet nozzle cartridge in which all nozzles are provided at a position at least twice the diameter of the branch flow path from the intersection.