JP3232131B2 - Liquid spray device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-liquid mixing type liquid spraying apparatus for spraying a deodorizing liquid, a disinfecting liquid or the like using a negative pressure generated by ejecting water vapor or the like.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show a conventional example of this type of liquid spraying apparatus. The water tank 1 stores, for example, water 2 for generating steam. The water 2 is sucked up by the operation of the pump 4 through the water supply pipe 3 and introduced into the vaporizer 20. The water 2 introduced into the vaporizer 20 is vaporized here to become steam, and is ejected from the steam nozzle 28.

As shown in FIG. 6, the internal structure of the vaporizer 20 is such that a metal housing 21 has a vaporizing chamber 22 inside, and the vaporizing chamber 22 is provided with an inlet 23 and an outlet 24. I have. The water supply pipe 3 is connected to the inlet 23. The vaporization chamber 22 is filled with a vaporization element 25 using a metal sintered body or the like, so as to promote the vaporization of the water 2 introduced into the vaporization chamber 22 from the water supply pipe 3. Also,
A panel-shaped heater 26 is incorporated in the housing 21, and the heater 2 is energized to heat the water 2 in the vaporization chamber 22. Further, a temperature sensor 27 such as a thermistor is disposed at a suitable portion of the housing 21. When the temperature in the vaporization chamber 22 reaches a set temperature T ° C. at which the water 2 can be vaporized instantaneously by heating. And sends a detection signal to a control device (not shown). The water vapor of the water 2 vaporized in the vaporization chamber 22 is jetted from a water vapor nozzle 28 connected to the outlet 24.

[0004] The apparatus is provided with a liquid tank 5 in which a spray liquid 6 such as a deodorant liquid or a disinfectant liquid is stored. The spray liquid 6 is sucked up by the liquid supply pipe 7 and is ejected from the spray liquid nozzle 8 at the tip. The spray nozzle 8 faces the direction perpendicular to the outlet of the steam nozzle 28 of the vaporizer 20, and ejects steam from the steam nozzle 28 to generate a negative pressure around the outlet of the spray nozzle 8. Using the negative pressure, the spray liquid 6 is sucked out from the liquid supply pipe 7 and jetted.

In the device having such a structure, if the pump 4 is started in a state in which air enters the pump 4, there is a possibility that an idling phenomenon may occur and a failure or breakage may occur. For this reason,
After the assembly is completed in the production line, the air inside the pump 4 is always expelled and a priming operation is performed when performing a test operation.

[0006] Even when the user is using the product as a product, it is desirable to perform a priming operation in consideration of safety when resuming use. The reason is that, even if the priming operation is performed at the previous use, if the stop time until the next use is long, the priming water filled in the pump 4 evaporates spontaneously, or the pump 4 This is to prevent air from entering and causing an empty shot.

Such a conventional apparatus is provided with a priming switch in addition to a start switch. The priming switch is operated each time priming is performed, and a series of controls for ejecting the spray liquid by a control device such as a microcomputer are performed. It is supposed to do it.

[0008]

However, it is troublesome to provide a priming switch specially and priming each time the priming is used. The greater the number of switches, the more complicated the control system and the higher the cost. Further, if a part of the priming water is fed into the vaporizer 20 without stopping at the pump 4, there is a problem of liquid dripping that the priming water leaks out of the steam nozzle 28 as it is. If the inside of the vaporizer 20 is filled with the priming water at the stage of priming the pump 4 in preparation for the target spraying, the burden of initially heating the vaporizer 20 increases, and time is required to raise the temperature to start spraying. Is significantly delayed. In addition, unexpected hot water or steam in the form of water droplets may be ejected from the steam nozzle 28.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the trouble of pump priming performed each time of use, simplify control, and solve the problem of inadvertent supply of priming water to a vaporizer. It is to provide a spraying device.

[0010]

According to a first aspect of the present invention, there is provided a liquid spray apparatus according to the present invention.
A first tank storing the liquid, a pump connected to the first tank through the first liquid pipe, a return pipe branched from the first liquid pipe on the pump discharge side and communicating with the first tank, and a return pipe. An on-off valve provided to open or close a conduit, a vaporizer provided with a vaporization chamber connected to the first liquid pipe and into which the first liquid is introduced by operation of the pump, a start switch of the device, and a vaporizer A heater for heating the vaporization chamber, a temperature sensor for detecting a set temperature at which the first liquid can evaporate by heating the vaporization chamber, and a temperature sensor connected to the vaporization chamber for ejecting vapor by the first liquid. One nozzle, a second tank containing a second liquid to be sprayed, and a second nozzle provided at an outer end of a second liquid pipe capable of sucking up the second liquid and having an ejection port facing the first nozzle.
An operation signal comprising a nozzle and a control device for transmitting a control signal, wherein the control device receives an ON signal of a start switch, sends an energization signal for preheating the vaporizer to the heater, and opens a return pipe line. A temperature sensor that detects that the first liquid has reached a set vaporization temperature by heating the vaporizer, by sending a pumping operation signal to the pump, which is operated for a predetermined time with a delay from the start, and then stopped. In order to perform control based on the detection signal from the controller and supply the first liquid to the vaporizer, a control signal for restarting the pump and a signal for stopping power supply to the heater are transmitted.

According to a second aspect of the present invention, the first liquid is detected by the liquid amount detecting means provided in the first tank to be less than a predetermined amount, and the control based on this detection signal is performed when the start switch is turned on. The control device can also be kept stationary.

[0012]

According to the liquid spraying apparatus of the present invention,
When the start switch is turned on, a series of controls from the priming operation of the pump to the spraying of the second liquid is performed by a signal from the control device. That is, when the start switch is turned on, the vaporizer is preheated by energizing the heater, and the on-off valve is opened. The priming of the pump is started after the elapse of a predetermined time from the start, and the priming more than necessary by the first liquid is returned from the return pipe to the first tank. Even if some priming water is introduced into the vaporizer, the priming water is preheated, so even if priming water is inadvertently introduced, this priming water will be used in the first step of the next process.
Heated in preparation for spraying by liquid introduction. When the vaporizer reaches the vaporization set temperature of the first liquid by heating by the heater, based on a detection signal from the temperature sensor that detects the temperature,
The control signal is sent to the pump and the pump is operated again to supply the first liquid to the vaporizer and stop supplying power to the heater.

In the case of claim 2, when the first liquid in the first tank is less than a predetermined amount, the first liquid is detected by the liquid amount detecting means,
Even if the start switch is turned on by the control based on this detection signal, the control device is maintained in the stopped state.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a liquid spraying apparatus according to the present invention will be described below with reference to FIGS. In FIG. 1, a water tank 10 (first tank) has water 11 (first
The liquid 11 is stored, and the water 11 can be drawn from the water tank 10 through the water supply pipe 13 (first liquid pipe) by the operation of the pump 12. The discharge side of the pump 12 is connected to the vaporizer 20 through the water supply pipe 13, and the pump 12 operates to pump up the water 11 and supply it to the vaporizer 20. Similarly, on the discharge side of the pump 12, a return pipe 14 is provided which branches off from the water supply pipe 13, and this return pipe 14 communicates with the water tank 10 to return the water other than the necessary amount of the water 11 once sucked up from here. Can be. The return pipe 14 is also provided with a normally closed electromagnetic on-off valve 15, which can be opened by opening the on-off valve 15 when the return pipe 14 is normally disconnected. That is, when the on-off valve 15 is opened to open the return line 14, the water 11 sucked up from the water tank 10 is supplied to the pump 1.
After passing through No. 2, it can be returned to the water tank 10 again through the return pipe 14.

As the vaporizer 20, a conventional one shown in FIG. 6 can be used. The water supply pipe 13 is connected to the inlet 23 of the vaporization chamber 22, and the liquid supply pipe (second liquid pipe) 32 for sucking up the spray liquid (second liquid) 31 is connected to the outlet 24.

A spray liquid tank (second tank) 30 is provided in the apparatus.
And spray liquid 3 such as deodorant and disinfectant
1 is accommodated and can be sucked up through the liquid supply pipe 32. A spray liquid nozzle (second nozzle) 33 is attached to the outer end of the liquid supply pipe 32 and faces from the direction perpendicular to the jet port of the steam nozzle 28 on the vaporizer 20 side.
The steam nozzle 28 and the spray liquid nozzle 33 are small-diameter metal tubes, and both are fixedly held by a nozzle holder 34.

On the other hand, as shown in FIG. 2 which shows a control circuit of the liquid spraying device, the circuit has a control device 40 such as a microcomputer, and an input port of the control device 40 is used to start and stop the liquid spraying device. The on / off signal v1 from the start switch 41 to be operated and the detection signal v from the temperature sensor 27
2 is input. The pump 12, the on-off valve 15 and the heater 26 are sequentially connected to the output port via electromagnetic first and second relays 42 and 43 and a solid state relay 44 (hereinafter referred to as SSR). The operation signals V1 to V3 controlled by 40 are output.

Next, the operation and operation of the liquid spraying apparatus according to the embodiment having the above configuration will be described with reference to the time chart of FIG. 3 and the flowchart of FIG.

When the apparatus is started, the start switch 41 is turned on when the power supply 45 is turned on (step 1).
-Hereinafter, described as S1, S2 ...). The timer is started by a control signal from the control device 40 based on this signal.
Then, the second relay 43 and the SSR 44 are closed and turned on, and the operation signal for opening the normally closed on-off valve 15 and the signal for energizing the heater 26 are sent out almost in synchronization. When the on-off valve 15 is opened, the conduit of the return pipe 14 is opened, and the vaporization chamber 22 is preheated by the heater 26 (S2).

When the first relay 42 is turned on after a delay of time t1 from the start of starting, an operation signal is sent to the pump 12 (S3). When the pump 12 is started, water 11 is pumped into the inside from the water tank 10 as priming water.
The inside of the pump is expelled, and water 11 more than necessary for priming is returned to the water tank 10 from the discharge side of the pump 12 through the return pipe 14. A part of the priming water that has left the pump 12 is
However, since it is heated by the heater 26, even if priming water is introduced, the temperature is raised to some extent by heating. Therefore, the water 11 does not spout from the steam nozzle 28 as it is. When the priming of the pump 12 is performed for the time t2, the control device 4 by the timer is used.
0 turns off the first relay 42 and the pump 1
The operation of Step 2 is stopped and the "priming" is ended (S4).

In the vaporization chamber 22, the temperature rises by energizing the heater 26 which continues from the preheating. When the temperature of the vaporization chamber 22 rises to a set vaporization temperature T ° C at which the water 11 can be instantaneously vaporized, for example, to around 180 ° C, the temperature sensor 27 detects this (S5). The detection signal is sent to the control device 40, in which control based on the detection signal is performed, an ON signal is sent to the first relay 42, an operation signal is sent to the pump 12, and the water 11 in the water tank 10 is discharged. It is sent to the vaporization chamber 22 through the water supply pipe 13 (S6). At this time, a signal is also sent to the on-off valve 15 to close the normally closed state. Since the vaporization chamber 22 is heated to a temperature at which it can be vaporized, the supplied water 11 is instantaneously vaporized into vapor, and is ejected from the vapor nozzle 28 (S7).

Negative pressure is generated around the ejection port of the spray nozzle 33 by the steam ejected from the steam nozzle 28. Due to this negative pressure, the spray liquid 31 in the spray liquid tank 30 is supplied to the liquid supply pipe 3.
2 and is sucked from the spray liquid nozzle 33 to collide with the ejected steam and be sprayed accordingly (S
8). During the spraying, the vaporization chamber 22 is controlled to maintain the set vaporization temperature T ° C.

When the required spraying is completed and the start switch 41 is turned off, the operation of the pump 12 is stopped by turning off the first relay 42 and the SSR 44 (S9), and the power supply to the heater 26 is stopped. . In synchronization with this, the second relay 43 is turned on by the operation of the timer, the normally closed on-off valve 15 is opened, and the pipeline of the return pipe 14 is opened (S1).
0).

By opening the return pipe 14, the water 11 remaining in the water supply pipe 13 between the pump 12 and the vaporizer 20 is removed.
Is returned to the water tank 10 through the return pipe 14 because the internal pressure of the vaporizer 20 is higher than the water pressure here.

As described above, in the liquid spraying apparatus of the embodiment,
During the priming operation, the on-off valve 15 is opened so that excess water 11 can be returned from the return pipe 14 into the water tank 10.
Even if a part of the back priming water is sent into the vaporization chamber 22, the vaporizer 20 can be used from the start of the apparatus.
Since the preliminary heating is performed by the heater 26, the return priming water that has entered the vaporization chamber 22 is heated. Therefore, even if it is not vaporized, it does not spill out from the steam nozzle 28 in a liquid state. By adopting the preheating method, at the start of spraying, the supplied water 1
1 has an advantage that the initial heating load can be reduced.

In the present invention, a float or a liquid amount detector 50 as shown in the drawing is set in the water tank 10, and if the water amount in the water tank 10 is less than a predetermined amount, the water amount is set to the liquid amount. It is also possible to detect by the detector 50, perform control based on the detection signal v3, and prevent the control device 40 from rising even if the start switch 41 is turned on. As a result, the water tank 10 and the like need not be idlely operated without noticing that the amount of water is too small, and the equipment can be protected from failure or damage.

In the embodiment, the on-off valve 15 is provided in the middle of the return pipe 14 to open and shut off the pipeline. Instead of this structure, a three-way switching valve may be provided at the branch between the main water supply pipe 13 and the return pipe 14 to control switching between the water supply pipe 13 and the return pipe 14 by a signal from the control device 40. it can.

[0028]

As described above, in the liquid spraying device according to the first aspect, a series of controls from the priming operation of the pump to the spraying of the second liquid are performed by the control device by turning on the start switch. This is done by a signal and does not require a special priming switch as in the past. Since the vaporizer is preheated by energizing the heater before the priming operation, even if the priming water of the pump is sent to the vaporizer, it will be heated by the next spraying step, and the nozzle will be in a liquid state and carelessly It does not erupt or leak from

According to the second aspect of the present invention, when the first liquid in the first tank is insufficient, the device such as the tank does not need to be idlely operated, and can be protected from failure or damage.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of a liquid spraying device according to the present invention.

FIG. 2 is a block diagram of a control circuit.

FIG. 3 is a timing chart at the time of spray control.

FIG. 4 is a flowchart at the time of spray control.

FIG. 5 is a schematic side view of a liquid spraying device showing a conventional example.

FIG. 6 is a cross-sectional view of the conventional vaporizer shown in FIG.

[Explanation of symbols]

10: water tank (first tank), 11: water (first liquid), 12: pump, 13: water supply pipe (first liquid pipe), 14
... return pipe, 15 ... on-off valve, 20 ... vaporizer, 22 ... vaporization chamber, 25 ... vaporizer, 26 ... heater, 27 ... temperature sensor, 28 ... steam nozzle (first nozzle), 30 ... spray liquid tank (Second tank), 31 ... spray liquid (second liquid), 3
2 ... liquid suction pipe (second liquid pipe) pipe, 33 ... spray liquid nozzle (second nozzle), 40 ... control device, 41 ... start switch, 50 ... liquid amount detector.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B05B ^7/ 00-7/16 B05B 11/06

Claims (2)

(57) [Claims] 1. A first tank containing a first liquid, a pump connected to the first tank through a first liquid pipe, and a branch from the first liquid pipe on the pump discharge side, which communicates with the first tank. A return pipe, an open / close valve provided in the return liquid pipe to open or shut off a pipe line, a vaporizer connected to the first liquid pipe and provided with a vaporization chamber into which the first liquid is introduced by operation of the pump; A start switch of the device, a heater provided in the vaporizer for heating the vaporization chamber, a temperature sensor for detecting a set temperature at which the first liquid can evaporate by heating the vaporization chamber, and a second sensor connected to the vaporization chamber. 1st to eject vapor by 1 liquid
A nozzle, a second tank containing a second liquid to be sprayed, a second nozzle provided at an outer end of the second liquid pipe through which the second liquid passes, and a jet nozzle facing the first nozzle, A control device for transmitting a control signal, wherein the control device receives an ON signal of a start switch, sends an energization signal for preheating the vaporizer to the heater, and opens and closes an operation signal for opening a return pipe line. The pump sends a priming signal to the pump, which is activated for a certain period of time with a delay from the start and then stopped, and the temperature sensor detects that the first liquid has reached the set vaporization temperature by heating the vaporizer. A liquid spraying apparatus, comprising: sending a control signal to restart a pump and sending a signal to stop energization to a heater in order to control based on a signal and supply a first liquid to a vaporizer. 2. A liquid level detecting means is provided in the first tank, and receives an ON signal of a start switch based on a detection signal from the liquid amount detecting means which detects that the first liquid is equal to or less than a predetermined amount. The liquid spraying device according to claim 1, wherein the control device is also kept in a stopped state.