JPH0440764Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention detects an abnormal temperature rise in the compressor due to clogging in the jet head, air supply pipe, etc. of a small-volume sprayer that uses two fluids, and at the same time This invention relates to a sensing device for a small-volume sprayer that can continue spraying by automatically switching over and supplying compressed air to a spare nozzle head.

[Conventional technology]

A sensor is installed in the middle of the air pipe connected to the compressor in a small amount sprayer that uses two fluids, and the sensor detects abnormal pressure changes in the compressed air in the air pipe, and this sensing causes an alarm to be activated. A sensing device for a small-volume spreader has been proposed that automatically notifies the operator. (For example, see Utility Model Publication No. 61-195363.) In addition, a switch for switching the air passage is attached to the air pipe connected to the compressor in a small-volume sprayer using two fluids, and the switch is connected to the switch. A jet head is connected to the tip of each branch pipe for air supply that can be communicated, and when the pressure or temperature of the compressed air changes at the jet head or the air supply pipe, the compressed air is transferred to another jet head by switching the air supply path using the switching device. A small-volume sprayer has been proposed that allows continuous spraying by supplying air to the area. (See Utility Model Publication No. 61-64281 for an example.) [Problem to be solved by the invention] Among the problems mentioned in the section of the prior art, the former problem is related to the pressure of compressed air in the air pipe. Alarms are activated via detectors in response to changes in temperature, but there are currently no countermeasures in place to deal with abnormal compressed air temperatures due to clogging in the jet head or air pipes. Since it is not possible to confirm that an abnormal situation has occurred with respect to the compressor itself, the spraying operation is forced to be abruptly interrupted, and there is also the risk that the compressor itself may be damaged.

In the latter case, it is possible to supply compressed air from one nozzle head to the other by switching the air supply passage by operating a switching device, but as with the former case, it is possible to cause an abnormal situation to the compressor itself. Since there is no automatic means to deal with such occurrences, there is a concern that an abnormal situation in the compressor could cause a problem in the air supply to the air pipes and jet head, even though there is a switching device.

This device was proposed by focusing on the above-mentioned drawbacks, and its purpose is to detect an abnormal situation in the compressor itself when a clogging condition occurs in the jet head or air pipe. At the same time, the present invention aims to provide a sensing device for a small amount sprayer that can continuously spray air by supplying air to a preliminary nozzle head by switching the air supply passage by operating a switching device.

[Means to solve the problem]

In order to achieve the above object, the sensing device for the small amount sprayer in this invention has a switching device attached to the tip of the air pipe connected to the compressor, and a jet head connected to the tip of each branch pipe branched from the switching device. On the other hand, in a small-volume sprayer that is equipped with an alarm at an appropriate location, an alarm that can respond to a sensor set on the compressor is attached to the compressor, and an actuator that operates in conjunction with the operation of the alarm is attached to the compressor. The switch is connected to the switch.

〔Example〕

This invention will be described below as an example with reference to FIGS. 1 and 2. It can be set above the compressor _C4 . For example, when the tip of the bimetal 23 is bent to one side, the tip of the bimetal 23 is brought into contact with the contact point 25 attached to the upper end of the column 24 that stands upright on the compressor _C4 , and the sensor S4 is connected to the compressor _C4 .
The sensor S ₄ , power source E ₄ , alarm F ₄ is formed as
are inserted in series with the conductor l ₄ and the jet heads J ₄ , J′ ₄ ,
When branch pipes a′ ₄ and a″ ₄ become clogged, sensor S ₄ detects and activates the temperature rise of the compressed air, and alarm F ₄ activates, e.g. by the sound of a buzzer or the intermittent blinking of a flashing light, indicating that the compressor
It is possible to notify abnormal temperature rise at _C4 .

Further, a switching device 30 such as a three-way valve is attached to the tip of the air supply pipe a ₄ in which the jet head connection piece 1 is interposed in the compressor C ₄ , and branch pipes a′ ₄ , a″ ₄ are branched from the switching device 30.
The jet heads J ₄ and J′ ₄ are connected to the respective tips of the conductor l 4 , while a conductor or connector such as a relay is connected to the conductor l ₄ .
An actuator 35 is attached to 34, the tip of the actuator 35 is connected to the switching device 30, and the switching device 30 is activated in conjunction with the activation of the alarm F ₄ to supply compressed air to the jet head side. It is possible to automatically switch the passage and convert from a clogged air passage to a normally connected air passage. branch pipe
Since the structures of jet heads J _{4 and} J' ₄ attached to the tips of a′ 4 and a″ ₄ are the same, the structure of jet head J ₄ will be described with reference to FIG. A spout is inserted into the recess g at the front end of a blind stopper 10 that is screwed onto the inner rear part of the support body 2 (in Figures 1 and 2, the left side is the rear and the right side is the front) of the support body 2 that protrudes integrally inside the lower part of the K. The rear end of the nozzle N in which the outlet y is drilled is tightly fitted and fitted, and the rear end of the through hole h that can be penetrated back and forth through the center of the nozzle N is inserted into the T-shaped hole drilled in the blind plug 10. A swirl chamber is formed between the inner circumferential wall of the nozzle cap 11, which communicates with the front end of the through hole i and is fitted and fixed inside the support 2 in front of the nozzle N, and the inclined edge n ₀ at the front end of the nozzle N. In the vortex chamber W, compressed air and a liquid such as a chemical or water are mixed in a high-speed vortex and can be ejected from the ejection hole 12 as fine particles in the form of smoke.
The lower end of the through hole i communicates with the upper end of the through hole P of the nipple 13 whose upper end is screwed onto the support body 2, and the core 15 is connected to the lower end of this nipple 13 via a disc 14 with an orifice. Disk 14, center core 15
is held and fixed by a cap 16 with a U-shaped cross section that is screwed onto the lower part of the nipple 13, and the core 1
Silicone tube 1 whose upper part is fitted and tightly attached to the outer peripheral edge of 5
A connecting piece 1 whose lower end of 7 is attached to a lid 18 of a storage tank T ₄ that stores a liquid q such as a chemical solution or water.
9, the upper end is tightly fitted inside the connecting piece 19, and the suction pipe 20 communicates with the silicone pipe 17.
is suspended in the storage tank _T4 , and the lid body 18 is
A stirring blade 22 is attached to the lower end of a rotating shaft 21 which is rotated by a stirring electric motor M fixed on the upper surface. A branch pipe a′ ₄ is installed below the connector 3 screwed onto the holder 2.
The upper part of the nozzle is connected so that compressed air can be supplied to the nozzle N side. The silicon pipe, connecting piece, and suction pipe on the jet head J' ₄ side are designated 17', 19', and 20', respectively. In the figure, 31 is a safety valve, 32 is a pressure gauge, 33
is a scattering trick.

[action, effect]

In this invention, the compressed air generated by the compressor C ₄ is passed through the air supply pipe _{a 4} to the switching device ₃₀ set at the position shown in FIG. At this point, it becomes a high-speed vortex state and is released into the atmosphere from the jet nozzle 12, but at this time, the vicinity of the discharge hole y of the nozzle N becomes negative pressure, so it is in communication with the through holes h, i, and p. The liquid q in the storage tank T ₄ is sucked into the vortex chamber W through the suction pipe 20, the silicone pipe 17, and the through holes p, i, and h, where it mixes with compressed air to form fine particles in the form of smoke. and is dispersed into the atmosphere from the nozzle 12. However, the head of the lever
During the spraying at J ₄ , dust, foreign matter, etc. adhere to the branch pipe a′ ₄ , the swirl chamber W, or the vicinity of the jet hole 12, clogging the passage, resulting in a reduction in the cross-sectional area of the air supply passage. When the temperature of the compressed air increases abnormally, the bimetal 23 bends and contacts the contact 25, activating the sensor S ₄ , power source E ₄ , alarm F ₄ , compressor C ₄ , bimetal 23 , and the contact 25, the electric circuit is closed, the alarm F ₄ is activated, and the operator is notified that the temperature of the compressor C ₄ has risen abnormally.
is activated, and the actuator 35 is activated to rotate the switching device 30 from the position shown in FIG.
In order to switch and communicate a ₄ with the branch pipe a″ ₄ , the compressed air passes through the branch pipe a″ ₄ and flows into the vortex chamber W on the jet head J′ ₄ side, where the same flow as in the jet head J _{′ 4} occurs. It mixes with the liquid q drawn into the suction pipe 20' by the action,
The particles become fine particles in the form of smoke and are dispersed into the atmosphere from the nozzle 12. In this way, the abnormal temperature rise in the compressor C ₄ due to the clogging of the jet head J ₄ and the branch pipe a' ₄ side is detected by the sensor S ₄ and the alarm F ₄ is activated, and at the same time, the switching device 30 switches the transmission. By communicating the trachea A ₄ with the branch pipe A″ ₄ , the spraying work can be carried out continuously, and the operator will be notified of abnormal temperatures in the compressor C ₄ , so be aware of abnormal situations. In addition, since the air supply passages are automatically switched, there is no need to separately prepare a dedicated machine, and there are practical benefits such as unmanned operation.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, with FIG. 1 being a diagram of the main piping, and FIG. 2 being a longitudinal sectional view of the jet head. C ₄ ……Compressor, F ₄ ……Alarm, J ₄ , J′ ₄ ……Full head, S _{4 ……Sensor, a 4 ……} Air pipe, a′ ₄ , a″ ₄ ……
Branch pipe, 30...switcher, 35...actuator.

Claims (1)

[Claims for Utility Model Registration] (1) A switching device is installed at the tip of the air supply pipe connected to the compressor, and a jet head is connected to the tip of each branch pipe branched from the switching device, while an alarm is installed at an appropriate place. In the attached small amount spreader, an alarm F 4 that can respond to the sensor S ₄ set in the compressor C ₄ is attached to the compressor _{C 4 ,} and an actuator that works in conjunction with the alarm F ₄ is attached. A sensing device for a small amount sprayer, which is formed by connecting a switch 30 to an airter 35. (2) The sensing device for a small amount sprayer according to claim 1, wherein the sensor _S4 is a temperature sensor.