JP2006136814A - Electrical leak prevention member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical leak prevention member that is capable of preventing the generation of electrical leak caused by transmitting high voltage through the surface of a cable to supply high voltage to an electrostatic spray part to jet charged drops. <P>SOLUTION: The electrical leak prevention member 1 is fitted to the middle way 18a in the longitudinal direction of the cable 18 to supply high voltage to the electrostatic spray part 15 to jet charged drops D and prevents the electrical leak to the other site by transmitting high voltage at the electrostatic spray part 15 through the surface of the cable 18. This electrical leak prevention member 1 is provided with a tubular support 21 constituted so that the middle way 18a of the cable 18 is inserted into a tube aperture, an annular recessed part 25 arranged over the whole outer peripheral of the support 21 and a seal member 24 to seal a gap between the inner peripheral face of the support 21 and the outer peripheral face of the cable 18. The support 21, the annular recessed part 25 and the seal member 24 are composed of an electric insulating material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is attached to an intermediate portion in the length direction of a cable that supplies a high voltage to an electrostatic spraying portion that ejects charged droplets, and the high voltage in the electrostatic spraying portion causes the surface of the cable to The present invention relates to a leakage preventing member for preventing leakage of electricity to other parts.

  As an example of a conventional electrostatic spraying device, an electrostatic chemical spraying device disclosed in Patent Document 1 is exemplified. This apparatus uses a back-powered sprayer that is carried on the back of an operator. As shown in FIG. 7, an electrode 82 is provided on the nozzle 81 to charge a conductive chemical solution, and the electrode 82 A high voltage generator 83 for applying a voltage is provided.

Japanese Utility Model Publication No. 6-41641

    By the way, since the chemical liquid of the electrostatic spraying device is prepared so as to have penetrability and spreadability so as to adhere to the crop efficiently, the spraying of the chemical liquid is not limited to the electrode 82 of the nozzle 81 but the electrode 82. And adheres well to the surface of the cable connecting the high voltage generator 83. In particular, when continuous spraying is performed for a long time, a continuous film of the chemical solution is formed from the nozzle 81 to the cable. As described above, since the chemical solution has conductivity, the high voltage of the electrode 82 is transmitted to the backside power sprayer side (operator side) via the continuous film through the surface of the cable. For this reason, for example, if an operator's hand touches this continuous film, or if this continuous film reaches the grounded part of the electrostatic spraying device, a leakage occurs, and an excessive current is generated in the high voltage generator 83. There is a problem that a sufficient electrostatic effect cannot be obtained.

In order to solve the above-mentioned problem, the leakage preventing member of the first invention is
It is attached to the middle part of the length direction of the cable that supplies a high voltage to the electrostatic spraying part that ejects the charged droplets, and the high voltage in the electrostatic spraying part is transmitted along the surface of the cable to the other part. A leakage preventing member for preventing leakage to the site,
A cylindrical support configured to be inserted in the middle of the cable into the cylindrical hole;
An annular recess provided over the entire outer periphery of the support;
A seal member that seals a gap between the inner peripheral surface of the support and the outer peripheral surface of the cable;
The support, the annular recess, and the seal member are made of an electrically insulating material.

The leakage preventing member of the second invention is
It is attached to the middle part of the length direction of the cable that supplies a high voltage to the electrostatic spraying part that ejects the charged droplets, and the high voltage in the electrostatic spraying part is transmitted along the surface of the cable to the other part. A leakage preventing member for preventing leakage to the site,
A support body interposed between the middle part of the cable and the other part, and extended so as to maintain a distance between the middle part and the other part;
An annular recess provided over the entire outer periphery of the support,
The support and the annular recess are made of an electrically insulating material.

  According to this configuration, since the liquid droplets do not easily enter the inside of the annular concave portion, the continuous film due to the adhesion of the liquid droplets to the electrostatic spraying portion can be interrupted by the annular concave portion. . Thereby, it is possible to prevent the high voltage of the electrostatic spraying part from being transmitted to the other part through the surface of the cable through the conductive droplet. Therefore, a high voltage can be reliably applied to the electrostatic spraying part, and the electrostatic function by the electrostatic spraying part can be exhibited stably.

As the leakage preventing member of the third invention, in the first or second invention,
The aspect which the depth of the said annular recessed part is extended in the length direction of the said support body is illustrated.

  According to this configuration, it is possible to ensure a large depth of the annular recess while suppressing an increase in the size of the leakage prevention member, and it becomes more difficult for the droplets to adhere to the back side of the annular recess. For this reason, the continuous film | membrane of the said droplet to the said electrostatic spraying part can be more reliably interrupted by the said annular recessed part.

As the leakage preventing member of the fourth invention, in the third invention,
The aspect provided with the collar part which narrowed the opening of this opening part facing the opening part while opening the opening part of the said annular recessed part facing the length direction of the said support body is illustrated.

  According to this configuration, when the liquid droplets accumulate in the electrostatic spraying part or the cable and flow toward the leakage prevention member side, it is possible to prevent the liquid from flowing into the annular recess, and in the air The floating droplet can be prevented from entering the annular recess.

As the leakage preventing member of the fifth invention, in the third or fourth invention,
Comprising at least a pair of the annular recesses,
An example in which the openings of the annular recesses are provided in opposite directions is illustrated.

  According to this configuration, by opening the annular recesses in both directions in the length direction of the support body, it is possible to provide a leakage preventing effect in both directions.

  According to the leakage preventing member according to the present invention, it is possible to prevent the occurrence of leakage due to traveling through the surface of the cable that supplies a high voltage to the electrostatic spraying portion that ejects the charged droplets. There is an effect.

  FIG.1 and FIG.2 has shown the electrostatic spray apparatus 2 equipped with the electrical leakage prevention member 1 of 1st embodiment which actualized this invention. As shown in FIG. 1, the electrostatic spraying device 2 includes a storage tank 11 as a chemical solution supply unit for storing and supplying a chemical solution for controlling diseases and insects of crops, and a chemical solution supplied from the storage tank 11. A high voltage is applied to the pump 12 as a chemical liquid pressure generating unit to be pressurized, the hand-held nozzle unit 14 connected to the discharge port of the pump 12 via the hose 13, and the electrostatic spray unit 15 of the hand-held nozzle unit 14. And a high voltage supply unit 16 for supply.

  As shown in FIG. 2, the leakage preventing member 1 has a length of a cable 18 that supplies a high voltage by a high voltage supply unit 16 to an electrostatic spray unit 15 that ejects a spray S composed of charged droplets D. It is attached to the middle part 18a of the direction, and is for preventing a high voltage in the electrostatic spraying part 15 from leaking to other parts along the surface of the cable 18. This leakage prevention member 1 includes a cylindrical support 21 configured so that a midway portion 18a of the cable 18 is inserted into a cylindrical hole, and an annular portion 22 integrally formed on one end side of the support 21. A cylindrical portion 23 that is integrally formed on the outer peripheral edge of the annular portion 22 and extends to the other end of the support 21, and an inner peripheral surface of the support 21 and the cable 18 at both ends of the support 21. Sealing members 24 and 24 are provided for sealing gaps between the outer peripheral surface and the outer peripheral surface. As described above, the annular portion 22 and the cylindrical portion 23 form an annular recess 25 on the entire outer periphery of the support 21. The depth of the annular recess 25 extends in the length direction of the support body 21, and the opening 25 a faces the length direction of the support body 21. On the other end side of the support 21, as shown by a two-dot chain line in FIG. 2, a flange portion 26 that confronts the opening portion 25 a of the annular recess 25 and narrows the opening of the opening portion 25 a can be provided. The flange portion 26 is made of rubber or soft resin, and the inner edge portion of the through hole 26 a is in close contact with the outer periphery of the support 21 without a gap. The other end side of the support 21 is attached to the injection tube 14 a of the hand-held nozzle unit 14 via an attachment member 27. The support 21, the annular recess 25, the seal member 24, and the attachment member 27 are made of an electrically insulating material.

  According to the leakage preventing member 1 of the present example configured as described above, since the droplet D is difficult to enter inside the annular recess 25, the continuous film M due to the adhesion of the droplet D to the electrostatic spraying portion 15. Can be interrupted by the annular recess 25. Thereby, it is possible to prevent the high voltage of the electrostatic spray unit 15 from being transmitted to the other part through the surface of the cable 18 through the conductive droplet D. Therefore, a high voltage can be reliably applied to the electrostatic spraying part 15, and the electrostatic function by the electrostatic spraying part 15 can be exhibited stably.

  Further, since the depth of the annular recess 25 extends in the length direction of the support body 21, it is possible to ensure a wide depth of the annular recess 25 while suppressing an increase in the size of the leakage preventing member 1. The droplet D becomes more difficult to adhere to the back side. For this reason, the continuous film M of the droplet D to the electrostatic spraying part 15 can be more reliably interrupted by the annular recess 25.

  Further, if the opening 25a of the annular recess 25 is directed in the length direction of the support 21 and a flange 26 is provided to narrow the opening of the opening 25a against the opening 25a, the electrostatic spraying portion 15 and the cable 18 can be prevented from flowing into the annular recess 25 when the droplet D accumulates on the leakage prevention member 1 side, and the droplet D floating in the air can be prevented from flowing into the annular recess. Intrusion into 25 can be prevented.

  Next, FIG. 3 shows a second embodiment embodying the present invention. This leakage prevention member 31 is mainly different from the first embodiment in the following points. Accordingly, parts that are the same as those in the embodiment are given the same reference numerals, and redundant description is omitted (the same applies to the other embodiments below).

  The leakage preventing member 31 of the present example is integrally formed with the second annular portion 32 in which the other end side of the support 21 is inserted into the inner hole and the outer peripheral edge of the second annular portion 32, and the support 21 The substantially cylindrical member 34 provided with the 2nd cylinder part 33 extended to the one end side is provided. A seal member 35 for sealing the gap is interposed in the gap between the inner hole of the second annular portion 32 and the outer peripheral surface of the support 21. As described above, the leakage preventing member 31 of the present example is provided with the second annular recess 25 on the other end side of the support 21 and in the opposite direction so that the openings 25a of both annular recesses 25 face each other. Is provided. In addition, a flange portion 26 is provided between both the opening portions 25a so that both surfaces of the opening portions 25a face the opening portions 25a so as to narrow the openings of the opening portions 25a. The substantially cup-shaped member 34, the seal member 35, and the flange portion 26 are also made of an electrically insulating material.

  According to the leakage preventing member 31 of the present example, in addition to the same effects as those of the first embodiment, both the annular recesses 25 are opened in both directions in the length direction of the support 21, so An effect of preventing leakage can be achieved.

  Next, FIG. 4 shows a third embodiment embodying the present invention. This leakage prevention member 41 is mainly different from the first embodiment in the following points.

  The leakage preventing member 41 of the present example supports an electrostatic spraying electrode portion 43 that adds an electrostatic function to the spraying device 42 that does not have the electrostatic function of charging the droplet D ejected from the spray nozzle 42a. It also serves as an electrode support means. The electrostatic spray electrode unit 43 is configured to charge the droplet D with a high voltage applied between the chemical solution and the electrostatic spray electrode unit 43. In this example, the electrostatic spray electrode unit 43 The electrode part 43 and the spray nozzle 42a constitute an electrostatic spray part. The electrostatic spraying electrode portion 43 is attached to one end side of the leakage preventing member 41 configured in the same manner as in the first embodiment, and is connected to the cable 18 inserted into the support 21 of the leakage preventing member 41. Yes. The other end side of the leakage preventing member 41 is attached to the injection tube 42 b of the spraying device 42 via the attachment member 27.

  According to the leakage preventing member 41 of this example, in addition to the same effect as that of the first embodiment, the effect specific to this example can be obtained.

  Next, FIG.5 and FIG.6 has shown the electrostatic sprayer 52 equipped with the electrical leakage prevention member 51 which concerns on 4th embodiment which actualized this invention. This leakage prevention member 51 is mainly different from the first embodiment in the following points.

  The electrostatic sprayer 52 is between a state (indicated by a solid line in FIG. 5) extending substantially vertically upward and a state (indicated by a two-dot chain line in FIG. 5) extending substantially horizontally to the side. A pair of left and right booms 53 that are rotatably supported is provided, and each boom 53 is provided with three electrostatic spraying portions 15 arranged at substantially equal intervals. A high voltage is supplied to each electrostatic spray unit 15 from a high voltage supply unit (not shown) connected by a cable 18.

  The leakage preventing member 51 of the present example is attached to a middle portion 18a in the length direction of the cable 18 that supplies a high voltage to the electrostatic spraying section 15 that ejects the charged droplets D, and the electrostatic spraying section This is to prevent a high voltage at 15 from leaking to the boom 53 side as another part along the surface of the cable 18. The earth leakage prevention member 51 is interposed between the middle portion 18a of the cable 18 and the boom 53, and extends to support the space between the middle portion 18a and the boom 53. An annular portion 22 integrally formed on one end side of the support 21 and a cylindrical portion 23 integrally formed on the outer peripheral edge of the annular portion 22 and extending to the other end of the support 21 are provided. As described above, the annular portion 22 and the cylindrical portion 23 form an annular recess 25 on the entire outer periphery of the support 21. The depth of the annular recess 25 extends in the length direction of the support body 21, and the opening 25 a faces the length direction of the support body 21. An intermediate portion 18 a of the cable 18 is supported on one end side of the support 21 via a holder member 55. Further, the other end of the support body 21 is attached to the boom 53 via an attachment member 27. Further, on the other end side of the support body 21, a flange portion 26 is provided that opposes the opening portion 25 a of the annular recess 25 and narrows the opening of the opening portion 25 a. The support 21, the annular recess 25, the flange 26, the holder member 55, and the attachment member 27 are made of an electrically insulating material.

  The effect similar to 1st embodiment can be acquired also by the earth leakage prevention member 51 of this example.

In addition, this invention is not limited to the said embodiment, For example, it can also be suitably changed and embodied as follows, for example in the range which does not deviate from the meaning of invention.
(1) The present invention is configured to be applicable to electrostatic spraying portions having other structures.
(2) The leakage preventing member of the third or fourth embodiment is configured in the same manner as the second embodiment (including at least a pair of annular recesses 25, and the openings of both annular recesses 25 are provided in opposite directions. Adopt what has been configured.

1 is a side view of an electrostatic spraying device equipped with a leakage preventing member according to a first embodiment that embodies the present invention. It is sectional drawing of the same leakage prevention member. It is sectional drawing of the earth-leakage prevention member which concerns on 2nd embodiment which actualized this invention. It is a front view of the electrostatic spraying apparatus which equipped with the earth-leakage prevention member which concerns on 3rd embodiment which actualized this invention. It is a front view of an electrostatic sprayer equipped with a leakage preventing member according to a fourth embodiment embodying the present invention. It is sectional drawing of the same leakage prevention member. It is sectional drawing of the conventional electrostatic spraying apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric leakage prevention member 15 Electrostatic spray part 18 Cable 18a Middle part 21 Support body 24 Seal member 25 Annular recessed part 25a Opening part 26 Gutter part 31 Electric leakage prevention member 41 Electric leakage prevention member 42 Spraying device 43 Electrostatic spray electrode part 51 Electric leakage prevention Member D Droplet M Continuous film S Spray

Claims (5)

It is attached to the middle part of the length direction of the cable that supplies a high voltage to the electrostatic spraying part that ejects the charged droplets, and the high voltage in the electrostatic spraying part is transmitted along the surface of the cable to the other part. A leakage preventing member for preventing leakage to the site,
A cylindrical support configured to be inserted in the middle of the cable into the cylindrical hole;
An annular recess provided over the entire outer periphery of the support;
A seal member that seals a gap between the inner peripheral surface of the support and the outer peripheral surface of the cable;
The support, the annular recess, and the seal member are leakage prevention members made of an electrically insulating material. It is attached to the middle part of the length direction of the cable that supplies a high voltage to the electrostatic spraying part that ejects the charged droplets, and the high voltage in the electrostatic spraying part is transmitted along the surface of the cable to the other part. A leakage preventing member for preventing leakage to the site,
A support body interposed between the middle part of the cable and the other part, and extended so as to maintain a distance between the middle part and the other part;
An annular recess provided over the entire outer periphery of the support,
The support and the annular recess are leakage prevention members made of an electrically insulating material.   The leakage preventing member according to claim 1 or 2, wherein a depth of the annular recess extends in a length direction of the support.   The leakage preventing member according to claim 3, further comprising: a flange that narrows the opening of the opening facing the opening while the opening of the annular recess faces the length of the support. Comprising at least a pair of the annular recesses,
The leakage preventing member according to claim 3 or 4, wherein the openings of the annular recesses are provided in opposite directions.

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