JPS6023661Y2 - Operation control device for internal humidifier in open case equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an operation control device for an internal humidifier in an open showcase facility in which a plurality of refrigerated open showcases for handling fruits and vegetables are installed in a store.

Stored items displayed and refrigerated in refrigerated open showcases tend to lose moisture and become dry, while fruit and vegetable products such as those listed above need to be prevented from drying out to maintain freshness.

As a countermeasure to this problem, humidifiers are installed in open showcases to spray water, and water is occasionally sprayed onto the products to humidify the products.

This conventional humidifier is shown in FIG.

In the figure, 1 is an open showcase cabinet.
2 is a product display room in the warehouse, 3 is a display shelf, 4 is a cold air ventilation path that surrounds the display room 2 and is divided into the cabinet 1, and 5 is a cold air ventilation name 1! A cooler is installed at 6, and 6 is a blower fan.

With the configuration described above, the cold air flow A flowing through the cold air ventilation path 4 is blown out from the top to the bottom into the open front area of the cabinet 1, forming a cold air curtain as indicated by the arrow A'.

On the other hand, water spray nozzles 7 are installed at appropriate locations toward the interior display room 2 as a humidifier, and a water supply pipe 8, a water supply solenoid valve 9,
Piping is connected to a water tank 11 via a pump 10.

Note that 12 is a water source such as tap water, and 13 is a water supply valve to the ice tank 11.

The water supply electromagnetic valve and the water supply pump 10 are temporally energized and controlled by a timer 14 set to, for example, two moments, which is installed in the open showcase, and when the operating time of the timer 14 arrives, the water supply pump 10 pressurizes the valve. The water is supplied to each nozzle 7 via a solenoid valve 9, and is sprayed into the refrigerator.

By the way, as stores such as supermarkets expand, multiple refrigerated open showcases are often installed within the same store.

Moreover, if each open showcase is equipped with an individual humidifier, the conventional system shown in Figure 1, which is configured to control the operation of one system of water spray nozzles using two water supply pumps, cannot be adopted as is. , a water supply pump is required for each open showcase, and the water supply equipment is also large-scale.

It is also possible to connect multiple water spray nozzle systems to one water supply pump and operate them simultaneously, but in such a system, the pump capacity increases and it is necessary to use a large machine as the water supply pump 10. be.

Moreover, since the humidification time span in a rice field is relatively short, it is extremely unreasonable to suspend operation of a large capacity pump for a long period of time except for the water spray operation time.

The present invention has been made in consideration of this point, and an object of the present invention is to obtain a humidifier operation control device that can smoothly operate multiple systems of water spray nozzles with one small-capacity water supply pump.

In order to achieve this objective, the present invention is equipped with a water supply solenoid valve for each system between multiple systems of water spray nozzles installed in each open showcase facing the product display room in the warehouse and one water supply pump. At the same time, the water supply pump and each water supply solenoid valve are started by a timer operation, and each water supply solenoid valve is sequentially switched and opened for a predetermined water spray time width. A sequential switching control circuit is provided in conjunction with the valve.

Next, embodiments of the present invention will be described in detail based on the drawings.

In Figure 2, 11 to 1■ are each open showcase of the open showcase equipment, 71 to 7■ are the water spray nozzles of the internal humidifier installed in each open showcase, and 8I to 8■ are each nozzle system. water supply piping.

Now, according to the present invention, for one pump 10, the water supply pipes 8I to 8■ of each system are connected in parallel via branch water supply pipes 15I to 15I [I] branched from the discharge pipe of the water supply pump 10. The piping is connected to the

Moreover, each branch water supply pipe has a water supply solenoid valve 9N to 9 for each system.
■ is inserted.

Therefore, each water supply solenoid valve 9N to 9■ and water supply pump 1
0 is connected to and controlled by a sequence switching control circuit 16, the details of which will be described later.

Note that the water supply valve 13 to the water tank 11 is controlled to open and close by, for example, a float type level switch 17.
Water is supplied automatically.

The order switching control circuit 16 has a circuit configuration as shown in FIG.

The correspondence of each symbol in the figure is as follows.

TM is timer 14, SV is water supply valve 13, SV1 to S■3
are direct-acting water supply solenoid valves 91 to 9 that open due to excitation.
■Solenoid, P is water pump 10, DR1 to DR3
1 is a time-limited operation relay, SW is a timer control/manual control selection switch, and 18 is a low water level switch for the water tank 11.

As shown in the figure, the control circuit 16 has a starting contact circuit 19 which is closed by the selection operation of the changeover switch SW by timer TM operation or manual operation, and a time-limited sequence in which the starting contact circuit 19 is connected to the power supply circuit 20 under the closing condition of the starting contact circuit 19. The circuit is configured to include circuit blocks of a relay circuit 21 and a power supply holding circuit 22 for the water supply pump 10.

Among these, the starting contact circuit 19 includes a changeover switch SW having a single-pole double-throw type terminal A connected to a movable contact plate and fixed terminals B and C, a terminal block (not shown), and a terminal N of the terminal block. and an a contact TMa of a timer TM inserted between the terminal B of the switch SW and the terminal B of the switch SW, and the terminal C of the switch SW and the terminal block terminal N are connected.

Moreover, the time-limited sequence relay circuit 21 is a time-limited relay DR1 to DR3 provided for each water supply solenoid valve solenoid SV1 to S■3.
The b contacts DR1゜~DR3b of each relay DR□~DR3 are inserted and connected to the excitation circuits of the attached water supply solenoid valve solenoids S■1~S■3, respectively, and the subsequent stage based on the water spraying order is relays DR2 and DR3
are cascade-connected via a-contacts DR1, DR2a of respective preceding stage relays DR1 and DR2.

Further, the time limit of each time limit relay DR, -DR3 is set corresponding to a preset water spray time width of each nozzle system.

Furthermore, the power supply holding circuit 22 of the water supply pump 10 has b contacts DR1o, D of each relay DR□ to DR3 connected in parallel with each other.
R3, and is inserted in series in the power supply circuit of the water supply pump 10.

Next, the operation of the above operation control device will be explained.

FIG. 4 shows the time chart.

The time T is preset by the 2-fence timer TM.

When the timer contact TMa is reached, the timer contact TMa closes and the time limit relay DR
□, the solenoid valve solenoid Sv1 is energized, and the water supply solenoid valve 9
The valve (2) is opened and water is supplied under pressure to the water spray nozzle (7) of the open showcase 11 in FIG. 2 for a predetermined time Ta to spray it into the refrigerator.

When the time limit Ta has elapsed, the operation shifts from the time limit relay DR to DR2 due to the time limit operation of the time limit relay DR1.

That is, the water supply solenoid valve 9■ is closed, and at the same time, the water supply solenoid valve 9■ is opened, and the open showcase 1■ is operated to spray water.

Subsequently, when time T3 is reached by a similar switching operation, the solenoid valve 9■ is closed and the solenoid valve 9■ is opened due to the time limit operation of the time limit relay DR2.

Then, when the time limit Tc set by the time limit relay DR3 has elapsed, the solenoid valve 9■ closes.

In addition, the water supply pump 10 is supplied with power via the power supply holding circuit 22 under the condition that any one of the b contacts of each of the time limit relays DR1 to DR3 is closed during the time when each of the water supply solenoid valves 9I to 9■ is open. Driving is retained.

At time T4 after the timer time Td of the timer TM has elapsed, the timer contact TMa is opened, and the time limit relays DR1 to D
R3 is demagnetized and returns to its initial state.

Then set the time T. arrives, timer contact T
Ma is closed, and the water supply valves 9I to 9■ are repeatedly controlled in the same manner as described above.

To switch from timer control to manual control, changeover switch SW is switched to terminal C side.

In this case, the electromagnetic valves 9I to 9■ are sequentially switched and controlled in the same manner as when the timer contact TMa is closed.

At the time when the control is completed, the water supply pump 10 and the time limit relays DR1 to DR3 are in the energized state.For example, at time T, the changeover switch SW is connected to the terminal B side, and the terminal A
-C is opened, time limit relays DR1 to DR3 return to the demagnetized state.

Further, in order to switch from timer control to manual control, the changeover switch SW is switched to the manual side, and the water supply solenoid valves 91-92 are sequentially controlled in the same manner as described above.

As is clear from the above explanation, the water spray nozzles 7I to 7■ of the plural systems are switched so as to sequentially receive water from one water supply pump 10 for a predetermined water spray time width and spray water into the refrigerator. Ru.

Therefore, the water supply pump 10 may be a small machine with a water supply capacity for one system, and the water supply equipment can be simplified.

Although the illustrated example shows an example in which there are three water spray nozzle systems, order switching control can be performed even in the case of three or more water spray nozzle systems by adding a time limit relay and configuring the circuit.

Furthermore, by constructing all the devices in the box surrounded by chain lines in FIG. 2 in advance into independent cases, on-site installation, maintenance and inspection, etc., can be easily carried out.

As described above, according to the present invention, it is possible to automatically switch and control the operation of multiple systems of humidifiers with a single water supply pump, and it is a humidifier that has great practical value for open showcase equipment. An operation control device can be provided.

[Brief explanation of the drawing]

Fig. 1 is a device layout diagram of a conventional open showcase humidifier, Fig. 2 is a system diagram of an embodiment of the present invention, Fig. 3 is a circuit diagram of the order switching control circuit in Fig. 2, and Fig. 4
The figure is a time chart of FIG. 3. 1■〜1■・・・Open showcase, 2...
...Inner display room, 7I~7■...Water spray nozzle, 9I~9■...Water supply solenoid valve, 10...
...Water pump, 14...Timer, 15I~
15I[[...Branch water supply pipe, 16...
・Sequence switching control circuit, 19...Starting contact circuit,
21...Timed sequential relay circuit, 22...
- Power supply holding circuit, SW...Timer control-manual control changeover switch, SV1~SV3...Solenoid of water supply solenoid valve, DR□~DR3...Time limit relay.

Claims (1)

[Scope of utility model registration request] In an open showcase facility consisting of multiple open showcases, multiple systems of water spray nozzles installed toward the internal product display room of each open showcase are installed in one.
The water supply pumps are connected in parallel to each other via branch water supply pipes each equipped with a water supply solenoid valve for each system, and the water supply pumps are operated for a certain period of time by the operation of a timer, and each water supply solenoid valve is connected to the water supply pump. 1. An operation control device for an internal humidifier in an open showcase facility, characterized by comprising a sequential switching control circuit that operates to sequentially switch and open a valve by a predetermined water spray time width during operation.