JP3069395U - Vending machine cathodic protection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anticorrosion device for a vending machine which can simultaneously prevent corrosion on a painted surface and an unpainted surface of a metal part and does not increase the size of the device and increase initial costs and running costs. . SOLUTION: The plurality of anodes are arranged on a painted surface inside and outside a vending machine and / or a non-painted metal member inside a vending machine via a constant voltage control circuit and a constant current supply circuit, and the anodes are placed through these anodes. To optimize the voltage and current applied to each metal member.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention uses an electrical system to prevent the metal parts of vending machines, which are often exposed to the atmosphere and installed, from being corroded by air pollutants or sea salt particles. The present invention relates to an anticorrosion device for a vending machine, which can automate the maintenance of the machine and extend the service life.

[0002]

[Prior art]

 Metal structures that are exposed to the atmosphere, even if the metal surface is painted, can be built up over time due to rainwater, moisture in the air, sulfur dioxide in the atmosphere, sea salt particles, and other contaminants. Corrosion is caused by electrolyte water formed on the surface of the object and dissolved oxygen in the water.

[0003] As a protective anode and a cathodic protection system for preventing corrosion of the painted surface of such a metal structure, devices developed by the present inventors have been commercially available (Japanese Patent Application Laid-Open No. 10-51879 and See JP-A-11-286793).

[0004] By the way, in recent years, the increase in the number of vending machines used has been remarkable as the lifestyle of people has changed. Such vending machines are installed in an open air environment or an environment very close to the open air environment. In particular, when exposed to seaside areas or areas with severe weather, or exposed to acid rain, which has become a problem in recent years, the metal parts of the equipment will corrode severely. Frequent failure of the device and shortening of the service life are problems.

[0005]

[Problems to be solved by the invention]

 In order to avoid the problem of corrosion in vending machines as described above, applying the above-mentioned cathodic protection system for metal structures is considered as an effective means. However, when applying the above-described corrosion protection technology for a metal structure to corrosion protection of a vending machine, not only corrosion prevention of a painted metal structure but also copper pipe of a cooler unit inside the vending machine is required. It will be necessary to develop economical systems and equipment that can simultaneously protect unpainted metal from corrosion.

Accordingly, an object of the present invention is to provide an anticorrosion device for a vending machine which can simultaneously protect the painted surface and the unpainted surface of a metal portion without increasing the size of the device and increasing initial costs and running costs. To provide.

[0007]

[Means for Solving the Problems]

 As a result of repeated trial and error in order to solve the above-mentioned problems, the inventors of the present invention have found that the constant voltage control circuit 2 and the plurality of anodes 1a, 1b, 1c, 1d,. By using an anti-corrosion control system consisting of an internal constant current supply circuit, the anti-corrosion of the painted surface of the vending machine 3 and the anti-corrosion of unpainted metal members such as copper pipes of internal metal equipment can be simultaneously achieved. It turned out to be achievable. Also, through such a corrosion protection control system, the amount of electricity used for corrosion protection can be reduced to the original operation function of the vending machine even if the power supply of the DC24V installed in the vending machine 3 is used. It was also clear that it could be adequately covered without any impact.

[0008] As described above, the present inventors use a 24 V DC power supply installed in the vending machine, and through the constant voltage control circuit and the constant current supply circuit, paint the inside and outside of the vending machine. By arranging the plurality of anodes on unpainted metal members in a vending machine and optimizing the voltage and current applied to each metal member through these anodes, the coating of the intended vending machine can be achieved. We have completed the cathodic protection system that simultaneously achieves anticorrosion of surfaces and anticorrosion of unpainted metal members of internal equipment.

[0009]

[Embodiment of the invention]

 As an embodiment of the present invention, an example of the arrangement of the anticorrosion control system when the applied voltage is 12 to 15 V DC, that is, an example of the arrangement of the constant voltage control circuit 2 and the anodes 1a, 1b, 1c, and 1d, As shown in FIG. In this example, the anode 1a is attached to the lower part inside the door 3a of the vending machine 3, the anodes 1b and 1c are attached to the lower front part of the body 3b of the vending machine 3 facing the door 3a, and the anode 1d is attached to the body 3b. Mounted on the ceiling. As the power supply, a 24 V DC power supply (not shown) built in the main body 3 b is used, and the power is introduced to the anticorrosion control system 2 via the 24 V DC power supply 8-pin connector 4 shown.

[0010] It is desirable that such a cathodic protection system for a vending machine is made into a kit as shown in FIG. 2 so that the vending machine 3 can be easily attached to the vending machine 3. The anodes 1a, 1b, 1c, and 1d containing the constant current supply circuit are connected to the constant voltage control circuit 2 via leads, and the anode 1a is directly connected to the constant voltage control circuit 2 and connected directly to the anode. The anode 1b is connected to the secondary lead, and the anodes 1c and 1d are connected to the secondary lead. Each of the anodes 1a to 1d can be easily fixed to the installation site with an adhesive tape 5. Further, as an 8-pin connector 4 for connection to a DC 24 V power supply, a female connector 4a and a male connector 4b are prepared. Further, a ground wire is drawn out from the constant voltage control circuit 2, and a ground terminal 6 is attached to the tip.

In the constant voltage control circuit 2, electric power is introduced into the circuit via a DC 24 V 8-pin connector 4. Reference numeral 11 denotes a protection circuit including a power supply protection circuit and an IC protection circuit for receiving the introduced power. Reference numeral 12 denotes a DC / DC converter, which controls the output voltage down to 15 V as an example. Reference numeral 13 denotes an overvoltage prevention system, which plays a role of reducing the voltage when the voltage is abnormally higher than the control value. In addition, as an example, a system including the transistor 14, the resistor 15, and the Zener diode 16 controls the voltage to a constant voltage of 15 V, and supplies a constant current supply circuit included in each of the anodes 1a to 1d. Feed from 20a to 20d.

The constant current supply circuits 20a to 20d are included in the anodes 1a to 1d, and apply a voltage of 15 V as an example. All the circuit elements constituting the constant voltage control circuit 2 are housed in one case as one unit as a whole. Each of the anodes 1a to 1d including the constant current supply circuits 20a to 20d is attached to the coating surface inside or partially outside the vending machine as described above, and the metal members inside the coating film and various types inside the vending machine are used. Metal parts of equipment are protected by cathodic protection.

In the above description, the configuration in which the constant current supply circuit is included in the anode is described. However, the present invention is not limited to this configuration, and the constant current supply circuit and the anode are configured separately. Alternatively, the constant voltage control circuit and the constant current supply circuit may be combined into one unit.

[0014]

[Effect of the invention]

 With the cathodic protection system of the present invention, vending machines installed in hot springs deteriorated in a short period of time due to sulfur dioxide, etc., requiring the renewal of cooler units and the repainting of cabinets. Can be stopped, which has resulted in significant cost reductions.

Conventionally, sulfur dioxide or hydrogen sulfide acts on a copper tube of a cooler unit, and a large amount of patina occurs in three months, and a corrosion hole is formed in the copper tube in six months, causing a failure in the device. .

As described above, in the past, even if the acid-resistant paint was applied, the durability was only one year. However, in a vending machine to which the cathodic protection device of the present invention is applied, even if one and a half years have passed, the device is not used. There was no deterioration of the copper tube inside, and a great effect was obtained.

Further, the rust progressed from the end of the cabinet, and the trouble that the coated steel plate was eroded in two to three years could be solved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a state in which the cathodic protection device of the vending machine according to the present invention is attached to the vending machine.

FIG. 2 is an explanatory view showing an example of a kit of the cathodic protection device of the vending machine according to the present invention.

FIG. 3 is a circuit diagram of a constant voltage control circuit and a constant current supply circuit constituting the cathodic protection device of the vending machine according to the present invention.

[Explanation of symbols]

 1a, 1b, 1c, 1d anode 2 constant voltage control circuit 3 vending machine 3a vending machine door 3b vending machine main body 4 DC24V power supply 8 pin connector 4a female connector 4b male connector 5 adhesive tape 6 ground terminal 11 Protection circuit 12 DC / DC converter 13 Overvoltage prevention system 14 Transistor 15 Resistor 16 Zener diode 20a, 20b, 20c, 20d Constant current supply circuit

Claims (2)

[Utility model registration claims] 1. A constant voltage control circuit, a constant current supply circuit for receiving a constant voltage current from the constant voltage control circuit and outputting a constant current, and connected to the constant current supply circuit and connected to the inside and outside of a vending machine. A plurality of anodes arranged and fixed on a painted surface and / or a non-painted metal member in the vending machine. 2. The cathodic protection device for a vending machine according to claim 1, wherein said constant current supply circuit is included in said anode.