JPH0543062U - Liquid feed sensing device and mounting device for capacitance sensor for liquid feed detection of small amount sprayer - Google Patents

Abstract

(57) [Summary] [Purpose] A capacitance sensor 58 is disposed in proximity to the liquid feed hose 40 that guides the liquid chemical from the liquid chemical tank 18 to the spray head 34, and the capacitance of the liquid chemical in the liquid feed hose 40 In the small amount sprayer (10) for detecting the presence or absence, erroneous detection of the electrostatic capacity sensor (58) due to dew condensation on the outer surface side of the liquid supply hose (40) is prevented. [Structure] The mounting device 42 includes a through hole 46 for holding a liquid supply hose that holds the liquid supply hose 40, a compressor 70 and a spray head 34.
Has a through hole 44 for connecting a compressed air pipeline that forms a part of the compressed air pipeline 38 that guides compressed air to, and the capacitance sensor 58 can be detached in proximity to the through hole 46 for grasping the liquid supply hose. Attached to. A part of the compressed air in the compressed air pipe connecting through hole 44 is guided toward the injection port 49 through the orifice passage 48, and the liquid supply hose holding through hole 46 and the liquid supply hose 40 are covered by the injection port 49. It is sprayed onto the grip sites to dry them.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid delivery sensing device using an electrostatic capacitance sensor and an attachment device for an electrostatic capacitance sensor for liquid delivery detection of a small amount sprayer, and more specifically, a liquid delivery conduit for detection by the electrostatic capacitance sensor. The present invention relates to a liquid delivery sensing device capable of eliminating the influence of dew condensation on the outer surface of the device and a device for mounting a capacitance sensor for liquid delivery detection of a small amount sprayer.

[0002]

[Prior Art]

 Small amount sprayers used for spraying chemicals in a house generally perform automatic operation to automatically stop the operation of the compressor when the chemicals in the chemical tank run out. When using the liquid delivery detection capacitance sensor to detect that the liquid to be sprayed is exhausted, the liquid delivery detection capacitance is located close to the liquid delivery conduit that guides the liquid from the liquid tank to the spray head. If a sensor is provided and the capacitance change due to the presence or absence of chemicals in the liquid supply pipeline is detected by the capacitance sensor for liquid detection, and the chemical does not pass through the liquid supply pipeline, It is judged that the drug solution of is gone.

[0003]

[Problems to be solved by the device]

 The inside of the house is warm due to heating, etc. (eg 20 to 30 ° C), while the liquid inside the liquid tank is lower than the temperature inside the house, and the inside of the house is at high humidity (80 to 100%). Therefore, dew condensation is likely to occur on the outer surface of the liquid feed conduit, and with the conventional capacitance sensor for liquid feed detection in a small amount sprayer, the dew condensation formed on the outer surface of the liquid feed conduit is It has been detected as a chemical solution, which is a cause of erroneous detection.

An object of the invention of claim 1 is to provide a liquid-feeding sensing device for detecting the presence or absence of liquid in the liquid-feeding conduit from a change in capacitance by using a capacitance sensor. This is to prevent erroneous detection due to condensation on the outer surface. An object of the invention of claim 2 is to prevent an erroneous detection of the liquid-feeding detection capacitance sensor due to dew condensation on the liquid-feeding pipe line in a small amount sprayer using the liquid-feeding detection capacitance sensor. It is to provide a mounting device. An object of the invention of claim 3 is to provide a mounting device which can further simplify the piping of the compressed air pipeline in the invention of claim 2.

[0005]

[Means for Solving the Problems]

 The invention will be described using the reference numerals of the drawings corresponding to the embodiments. In the liquid delivery sensing device according to claim 1, the capacitance sensor (58) is arranged in proximity to the liquid delivery conduit (40) for guiding the liquid, and the liquid in the liquid delivery conduit (40) is disposed. The presence or absence of is detected from the capacitance. The liquid delivery sensing device according to the first aspect of the invention has a nozzle (49) for blowing air to a portion of the liquid delivery conduit (40) in the vicinity of the capacitance sensor (58).

The mounting device (42) of the capacitance sensor (58) for liquid detection of the small amount sprayer (10) of claim 2 has the following components (a) to (c). (A) A gripping part (46) for gripping the liquid supply conduit (40) that guides the chemical solution to the jet head (34) (b) A capacitance sensor (58) for liquid transfer detection in proximity to the gripping part (46) (54) (c) The nozzle (49) that blows the compressed air supplied from the compressor (70) to the grip (46).

The mounting device (42) of the capacitance sensor (58) for liquid detection of the small amount sprayer (10) of claim 3 further comprises the following components (d) and (e): .. (D) Passage part (44) forming a part of the compressed air passage (38) for guiding the compressed air from the compressor (70) to the jet head (34) (e) Compressed from the passage part (44) to the injection port (49) Orifice passage that guides air (48)

[0008]

[Action]

 According to the first aspect of the present invention, the compressed air is blown from the injection port (49) to the adjacent portion of the liquid transfer conduit (40) that is close to detect the presence or absence of the liquid. As a result, the liquid supply conduit (40) is dried in the vicinity of the capacitance sensor (58), and dew condensation is suppressed.

According to the second aspect of the invention, in the attachment device (42), the injection port (49) is supplied with compressed air from the compressor (70) and blows the compressed air to the gripping part (46). As a result, the grasped portion of the grasping portion (46) and the liquid supply conduit (40) is dried, and dew condensation is suppressed.

According to the third aspect of the present invention, the compressed air generated by the compressor (70) is guided to the spray head (34) through the compressed air passage (38) and, on the way, the passage of the attachment device (42). Via part (44) At that time, a part of the compressed air reaches the injection port (49) from the passage portion (44) through the orifice passage (48) and is blown from the injection port (49) to the gripping portion (46).

[0011]

【Example】

 The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 9 is a perspective view schematically showing the whole of the small amount spreader 10. The small amount sprayer 10 is used for spraying the chemical liquid in the house or the like, and the main body 12 has wheels 14 attached to the lower portion and is movable by pushing a handle 16 at the rear portion by hand. The chemical liquid tank 18 stores the chemical liquid and is mounted on the main body 12 together with a compressor 70 (only the reference numeral is shown in FIG. 7) for generating compressed air. The blower unit 20 is attached via a bracket 22 to the upper portion of the main body 12 so that the vertical and horizontal angles can be adjusted, and the jet nozzle device 24 is detachably attached to the front face side.

FIG. 10 is a vertical sectional view of the blower unit 20. The motor 26 is fixedly installed in the casing 30 via the stay 28, and its axis is aligned with that of the casing 30 to drive the fan 31. The pair of mesh bodies 32 are arranged on the front side of the casing 30 and the rear side of the fan 31 in the axial direction, and the peripheral edges are fixed to the casing 30. The spouting device 24 has a central spouting head 34 and a housing 36 that covers the radial circumference of the spouting head 34, and is detachably mounted at the rear end of the housing 36 at the front center of the front net 32. To be. Due to the rotation of the fan 31, air is sucked in from the rear of the blower unit 20 and is blown out in front of the blower unit 20. The spray head 34 communicates with the compressor 70 and the chemical liquid tank 18 via a compressed air pipe 38 and a liquid supply hose 40, respectively, and the compressed air is jetted from the compressor 70 to the tip of a nozzle (not shown). A negative pressure is generated, and the negative pressure sucks the chemical solution from the chemical solution tank 18 and ejects the chemical solution in a mist form from the nozzle.

1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5 are a cross-sectional view of the mounting device 42 seen from the front side, a plan view, a front view, a right side view and a rear view of the mounting device 42, respectively. .. Mainly in FIG. 1, the compressed air pipeline connection through-hole 44 and the liquid feed hose gripping through-hole 46 extend in parallel to each other, penetrate the attachment device 42, and pass through the compressed air pipeline connection penetration. The hole 44 has a thread groove. The three orifice passages 48 extend at equal intervals in the extending direction of the compressed air pipe line connecting through hole 44 and the liquid feed hose holding through hole 46 and at right angles to each other. The passage connecting through hole 44 and the liquid feed hose holding through hole 46 are communicated with each other. The end of the orifice passage 48 on the side of the through hole 46 for grasping the liquid supply hose functions as the injection port 49. The slit 50 extends over the entire length of the liquid feed hose holding through hole 46, and connects the liquid feed hose holding through hole 46 to the side surface of the mounting device 42 over the entire length. The two air discharge holes 52 are formed on the liquid supply hose holding through hole 46 so that they reach the liquid supply hose holding through hole 46 from the outer surface side of the mounting device 42 at different positions in the extending direction of the slit 50. Are drilled in the right angle direction.

Mainly in FIG. 2, the sensor mounting screw hole 54 extends from the side surface next to the side surface of the mounting device 42 in which the slit 50 is formed to the through hole 46 for gripping the liquid supply hose, and at the tip thereof. As a result, it reaches the vicinity of the through hole 46 for grasping the liquid supply hose sufficiently. Two fixing screw holes 56 (FIG. 5) are formed on the side surface opposite to the side surface of the mounting device 42 in which the slit 50 is formed.

FIG. 6 is a perspective view of the capacitance sensor 58. The capacitance sensor 58 has a regular hexagonal portion 60, a screw-in portion 62 that projects forward from the regular hexagonal portion 60, and a lead wire 64 that extends from the rear end.

FIGS. 7 and 8 are views showing a state in which the capacitance sensor 58 and the pipe are attached to the attachment device 42 from the screwed side of the electrostatic capacitance sensor 58 and the slit 50 side. The compressed air line 38 includes a compressor side portion 66 and a jet head side portion 68 connected to the compressor 70 and the jet head 34 at one end side, respectively, and the compressor side portion 66 and the jet head side portion 68 are attached to the mounting device 42. The connector 72 is attached to the connector 72 at the end portion on the side, and the connector 72 is partially screwed into the through hole 44 (FIG. 1 etc.) for connecting the compressed air pipeline in the screw tube portion 74. On the other hand, the liquid supply hose 40 is connected to the spray head 34 and the chemical liquid tank 18 at both upper and lower ends, and guides the chemical liquid from the chemical liquid tank 18 to the spray head 34. The operator extends the portion of the liquid feed hose 40 attached to the attachment device 42 to make it flat, and inserts it into the liquid feed hose holding through hole 46 (FIG. 1 and the like) through the slit 50 in a flat state. The diameter of the liquid supply hose gripping through hole 46 is appropriately smaller than the free diameter of the liquid supply hose 40, and after the liquid supply hose 40 is inserted into the liquid supply hose gripping through hole 46, it changes from the flat state to the original diameter. After returning, the holding state is established in the through hole 46 for holding the liquid supply hose. The capacitance sensor 58 is screwed into the sensor mounting screw hole 54 of the mounting device 42 at the screwed portion 62, and the tip end of the screwed portion 62 is fitted into the through hole 46 (FIG. 1 etc.) for gripping the liquid supply hose. The position is close enough. The base of the stay 76 is fixed to the main body 12 (Fig. 10) and the like, and the two screws 78 are inserted into the fixing screw holes 56 of the mounting device 42 after inserting the tip of the stay 76. The mounting device 42 is fixed to the tip of the stay 76.

In FIGS. 7 and 8, the mounting device 42 is mounted on the main body 12 in a specified direction so that the through hole 46 for grasping the liquid supply hose and the orifice passage 48 are in the vertical direction. The liquid supply hose gripping through hole 46 and the orifice passage 48 may be attached to the main body 12 in a horizontal direction and with the slit 50 facing downward.

The operation of the embodiment will be described. While the temperature in the house where the small amount sprayer 10 is used is high due to heating, etc., the chemical in the chemical tank 18 is lower than the temperature in the house, and the humidity in the house is high. ing. Since the low-temperature chemical liquid is sent from the chemical liquid tank 18 to the spray head 34 via the liquid supply hose 40 as the small amount sprayer 10 is operated, dew condensation easily occurs on the outer surface of the liquid supply hose 40. On the other hand, the compressed air generated by the compressor 70 has an inherently high temperature due to the high temperature in the house, and has a higher temperature due to adiabatic compression. It is sent to the jet head 34 through the passage 38, and passes through the compressed air pipeline connection through hole 44 of the mounting device 42 on the way. A part of the compressed air in the compressed air pipe line connecting through hole 44 flows toward the liquid feed hose holding through hole 46 through the orifice passage 48, and from each nozzle 49, the liquid feed hose holding through hole. Introduced into 46. The compressed air passes between the liquid supply hose gripping through hole 46 and the portion of the liquid supply hose gripping through hole 46 to be gripped by the liquid supply hose gripping through hole 46 and the liquid supply hose gripping through hole 46. The gripped portion of the liquid hose 40 is dried and allowed to escape to the outside of the mounting device 42 through the air discharge hole 52. By this drying, dew condensation is suppressed on the grasped portion of the liquid feed hose holding hole 46 and the liquid feed hose 40. The capacitance sensor 58 detects the presence or absence of the chemical liquid in the liquid supply hose 40 from the capacitance without being affected by dew condensation. When the capacitance sensor 58 detects the disappearance of the flow of the chemical liquid in the liquid supply hose 40, the operation of the compressor 70 is stopped by the control device (not shown), and the chemical liquid spraying work by the small amount sprayer 10 is completed. It

[0019]

[Effect of the device]

 According to the invention of claim 1, since air is blown from the injection port to the adjacent portion of the liquid feeding pipe line where the electrostatic capacitance sensor is in close proximity to dry it, dew condensation in the adjacent portion is suppressed, and the electrostatic capacitance sensor It is possible to prevent erroneous detection of.

According to the invention of claim 2, in the small amount spraying machine, the gripping part of the mounting device for gripping the liquid feeding conduit for guiding the chemical liquid to the spray head is sprayed with a portion close to the compressor from the spray port to dry. It is possible to suppress dew condensation on the grasped portion and the grasped portion of the liquid delivery conduit, and prevent erroneous detection of the liquid delivery detection capacitance sensor due to dew condensation.

According to the third aspect of the present invention, the passage portion forming a part of the middle of the liquid feeding conduit for guiding the compressed air from the compressor to the spray head is formed in the attachment device, and the passage portion is formed through the orifice passage. Since a part of the compressed air is guided from the nozzle to the nozzle, a dedicated pipe for guiding the compressed air from the compressor to the nozzle can be omitted, and the piping can be simplified.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a mounting device as viewed from the front direction.

FIG. 2 is a plan view of a mounting device.

FIG. 3 is a front view of the attachment device.

FIG. 4 is a right side view of the attachment device.

FIG. 5 is a rear view of the attachment device.

FIG. 6 is a perspective view of a capacitance sensor.

FIG. 7 is a diagram showing a state in which the capacitance sensor and the pipe are attached to the attachment device, from the screwing side of the capacitance sensor.

FIG. 8 is a view showing a state in which the capacitance sensor and the pipe are attached to the attachment device from the slit side.

FIG. 9 is a perspective view schematically showing the entire small amount spreader.

FIG. 10 is a vertical cross-sectional view of a blower unit.

[Explanation of symbols]

 10 Small amount sprayer 34 Jet head 38 Compressed air pipeline (compressed air passage) 40 Liquid feed hose (liquid feed pipeline) 42 Mounting device 44 Compressed air pipeline connection through hole (orifice passage) 46 Penetration for holding liquid feed hose Hole (holding part) 48 Orifice passage 49 Jet port 54 Sensor mounting screw hole (mounting part) 58 Capacitance sensor (capacitance sensor for liquid feeding detection) 70 Compressor

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[Procedure amendment]

[Submission date] December 13, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of Codes] 10 Small amount sprayer 34 Jet head 38 Compressed air pipeline (compressed air passage) 40 Liquid supply hose (liquid delivery pipeline) 42 Mounting device 44 Compressed air pipeline connection through hole ( passage part ) 46 Delivery Through hole for grasping liquid hose (grasping part) 48 Orifice passage 49 Injection port 54 Screw hole for sensor mounting (mounting part) 58 Capacitance sensor (capacitance sensor for liquid delivery detection) 70 Compressor

Claims (3)

[Scope of utility model registration request] 1. A capacitance sensor (58) is disposed in proximity to a liquid feed conduit (40) for guiding a liquid, and the capacitance of the presence or absence of the liquid in the liquid feed conduit (40) is measured. In the liquid delivery sensing device for detecting from, the capacitance sensor (5
A liquid delivery sensing device, characterized in that it has a nozzle (49) for blowing air to a portion close to (8). 2. A gripping portion (46) for gripping a liquid feeding conduit (40) for guiding a chemical liquid to the spraying head (34), and a capacitance sensor (for liquid feeding detection in proximity to the gripping portion (46)). 58) A mounting portion (54) to which the compressor (70) is detachably attached, and a spray port (49) for blowing the compressed air supplied from the compressor (70) to the gripping portion (46). Mounting device for capacitance sensor for detecting liquid transfer of machine. 3. A passage portion (44) forming a part of a compressed air passage (38) for guiding the compressed air from the compressor (70) to the jet head (34), and the passage portion (44) to the injection port. 3. A mounting device for a capacitance sensor for liquid delivery detection of a small amount sprayer according to claim 2, further comprising an orifice passage (48) for guiding the compressed air to the (49).