A spray pot for producing disinfectant water by direct current electrolysis

Abstract

The present invention provides a spray pot for producing disinfectant water by direct current electrolysis, wherein a spray nozzle, an electric water pump, a handheld switch, a pressure relief valve and an electric control unit are arranged in a handheld part of the spray pot; the electric control unit comprises a direct current power supply, a circuit board and a display screen, and the electric control unit is also electrically connected with a micro electrolysis chamber, the electric water pump and the handheld switch; the spray pot chamber is communicated with the micro electrolysis chamber; a substrate is arranged on the upper part of the micro electrolysis chamber, and the substrate and a bottom plate with water permeable holes are connected by snaps to form an electrolysis chamber, and an electrode sheet array is arranged in the micro electrolysis chamber; the electrode sheet array is connected with a low-voltage direct current power supply to form a direct current electrolysis device; when producing disinfectant water, the direct current electrolysis device performs low-voltage electrolysis treatment on salt water to generate a sodium hypochlorite solution that can be used for disinfection operations, and keeps the pH value of the liquid environment of the micro electrolysis chamber in an alkaline state; the present invention can prepare household disinfectant water by a diaphragm-free salt water electrolysis method, and can be used for household sanitation disinfection.

Description

Technical Field

[0001] The invention relates to the technical field of sanitary equipment, in particular to a spray pot for generating disinfectant water by direct current electrolysis. Background Art

[0002] The electrolytic spray kettle uses electrodes to electrolyze the water in the kettle to obtain an electrolytic liquid (the electrolytic liquid has a certain disinfection and sterilization effect). The electrolyte in the kettle is transported and sprayed out through the pump body in the kettle, thereby achieving disinfection and sterilization of the target object. Taking the use of electrodes to electrolyze salt water as an example, sodium hydroxide, hypochlorous acid and sodium hypochlorite will be produced in the salt water after electrode electrolysis. The chlorine-containing disinfectant solution produced is widely used in the sterilization and disinfection of daily necessities and public environments. It can also remove pesticides remaining on the surface of fruits and vegetables. The chlorine-containing disinfectant solution prepared by electrolyzing salt water can be easily volatilized after being sprayed on the surface of daily necessities and the ground, without any residue, and will not cause any harm to the environment and human body; at the same time, the electrolysis of salt water to produce an aqueous solution mainly composed of sodium hypochlorite has a better sterilization and disinfection effect when used in public places.

[0003] The most important component of the electrolytic spray pot is the electrolysis device. The technical core of the electrolytic salt water generation equipment lies in the manufacturing technology of the electrolytic electrode. Since the sodium hypochlorite and hypochlorous acid produced by the diaphragm electrolysis of salt water are very oxidizing, and the positive electrode overpotential is very high during the electrolysis of salt water, the electrode for the electrolysis of salt water must be made of materials with good conductivity, oxidation resistance, low oxygen overpotential and no reaction with sodium hypochlorite. At present, there are very few materials that can meet the requirements of the electrolytic salt water electrode at the same time. This has caused the electrodes currently used for the electrolysis of salt water to be basically coated with rare metals on the surface. The materials commonly used to manufacture the positive and negative electrodes of the electrolytic salt water are mainly titanium, platinum, iridium, ruthenium and other metals and their coatings. The commonly used titanium alloy surface is electroplated with metal platinum, or the titanium alloy surface is coated with iridium-ruthenium alloy, graphite plate, etc. Among them, platinum, iridium, and ruthenium alloy materials are rare metals with high prices, which makes the electrode cost expensive. On the other hand, the use environment, electrolysis process, structural design and installation method of the electrolytic electrode have an important influence on the useful function, electrolysis efficiency and conversion performance of the electrolytic electrode.

[0004] The above problems affect the popularization of electrolytic spray bottles in households and need to be solved. Summary of the invention

[0005] The invention provides a spray pot for producing disinfectant water by direct current electrolysis, which can prepare household disinfectant water by a diaphragm-free salt water electrolysis method and can be used for household sanitation disinfection.

[0006] The present invention adopts the following technical solutions.

[0007] A spray pot for producing disinfectant water by direct current electrolysis, wherein a spray nozzle, an electric water pump, a handheld switch, a pressure relief valve and an electric control unit are arranged in a handheld part above the spray pot; the electric control unit comprises a direct current power supply, a circuit board and a display screen, and is also electrically connected to a micro electrolysis chamber, the electric water pump and the handheld switch; the pot cavity of the spray pot body can be used to store raw materials and products of disinfectant water, and the pot cavity is communicated with a micro electrolysis chamber arranged below; a base plate is arranged on the upper part of the micro electrolysis chamber, and the base plate and a bottom plate with water permeable holes are connected by snaps to form an electrolysis chamber, and an electrode sheet array consisting of mesh anodes and mesh cathodes that are spaced and fixedly arranged is arranged in the micro electrolysis chamber; the electrode sheet array is connected to a low-voltage direct current power supply to form a direct current electrolysis device; when producing disinfectant water, the direct current electrolysis device of the spray pot performs low-voltage electrolysis treatment on salt water to generate a sodium hypochlorite solution that can be used for disinfection operations, and keeps the pH value of the liquid environment of the micro electrolysis chamber in an alkaline state.

[0008] The substrate and the bottom plate on the upper part of the micro electrolytic chamber are connected as a whole by snap fasteners. The first lower cover protrusion arranged on the bottom plate presses against the concave and convex columns of the substrate, and the second lower cover protrusion presses against the anode at the welding column of the substrate to assist in the firmness and stability of the electrolytic chamber. The bottom plate and side walls of the micro electrolytic chamber are provided with water-permeable holes communicating with the pot cavity.

[0009] The electrode sheet array includes a titanium-based ruthenium-iridium-plated mesh anode and a titanium-based ruthenium-iridium-plated mesh cathode. The two mesh electrodes are sheet electrodes and are respectively arranged on the concave-convex column and the card slot of the combined concave-convex column under the substrate; the combined concave-convex column is partially connected to the water suction port of the electric water pump, and the other column is provided with a card slot, and the card slot is used to separate the mesh electrodes;

[0010] The low-pressure electrolysis treatment of the salt water is a diaphragm-free electrolysis treatment. When the low-pressure electrolysis treatment is performed, the electrode sheet array is immersed in the salt water so that the salt water contacts the surfaces of the two charged mesh electrodes at the same time, and the water can flow freely between the upper and lower mesh electrodes. The mesh of the cathode mesh electrode placed on the upper layer is larger than that of the anode mesh electrode to facilitate the rapid escape of the generated hydrogen; the interval range between the mesh anode and the mesh cathode is 0.5mm~2.5mm.

[0011] The mesh anode and the mesh cathode are both provided with a conductive part and a mesh-shaped electrolytic part connected to the conductive part; the low-voltage DC power supply outputs DC power with a voltage range of 1V~24V, and supplies power by welding wires through high and low welding columns arranged on the substrate and the conductive parts of the mesh anode and the mesh cathode, and the connection points are covered with waterproof glue for protection.

[0012] The substrate on the upper part of the micro-electrolysis chamber is a transparent V-shaped substrate; a lighting device is provided in the micro-electrolysis chamber; a lighting device is provided in the upper part of the V-shaped substrate; when low-pressure electrolysis treatment is carried out, bubbles such as hydrogen generated in the brine in the micro-electrolysis chamber can smoothly bypass the edge of the V-shaped substrate and rise to the pressure relief valve above for discharge; bubbles such as hydrogen generated by electrolysis can refract or reflect the light of the lighting device, forming a significant visual effect to prompt that the brine electrolysis operation is currently in progress.

[0013] When the direct current electrolysis device finishes electrolyzing the brine in the micro-electrolysis chamber, the liquid environment of the micro-electrolysis chamber is a liquid environment with a pH range of pH 8 to pH 10.

[0014] The salt water in the pot cavity has an initial concentration of not less than 10 g / L. The spray pot is provided with a timer for timing the duration of low-voltage electrolysis. The frequency of the electrolysis treatment is every 3 minutes, and the number of electrolysis times is specifically determined according to the required disinfectant water concentration.

[0015] The sodium hypochlorite solution generated in the micro-electrolysis chamber can be sucked by a controlled electric water pump on a spray pot through a water suction port on a substrate in the electrolysis chamber and sprayed for disinfection through a spray port; the spray pot can also be opened to pour out the sodium hypochlorite solution for cleaning, soaking and other disinfection methods.

[0016] The low-voltage DC power supply includes a rechargeable battery; the electric water pump and the DC electrolysis device are both powered by the low-voltage DC power supply.

[0017] When the mesh anode and the mesh cathode are large-area soft mesh electrodes, the preparation method of the electrode array comprises the following steps:

[0018] Step A1, distributing and attaching mesh anodes and mesh cathodes on both sides of the fork-shaped separation sheet, so that the spacing between the mesh anodes and mesh cathodes meets the spacing range requirements;

[0019] Step A2, selecting a plurality of support positions on the surface of the mesh electrode, dripping a non-conductive glue through the mesh surface of the mesh anode and the mesh cathode at the gaps where the forked separation sheets are bifurcated, so that the glue forms glue droplets connecting the mesh anode and the mesh cathode, and the glue is allowed to solidify at rest, and insulating glue particles are formed at the support positions to lock the positions of the mesh anode and the mesh cathode and to fix the distance between the two;

[0020] Step A3, take out the fork-shaped separation sheet to complete the preparation of the electrode sheet array. The prepared electrode sheet array can be connected to the wire using a copper nose workpiece and locked and fixed.

[0021] The beneficial effects of the present invention are:

[0022] Since the sodium hypochlorite disinfectant is prepared by using diaphragm-free direct current brine electrolysis technology, the liquid can meet the national standard requirements in the alkaline operating range, and can adapt the electrode material to a more suitable anti-corrosion environment, greatly reducing the corrosiveness of the solution in the electrolysis process. In addition, the part of the power supply circuit in the water also adopts a reliable waterproof rubber seal design, thereby reducing the corrosive loss of the electrode and the power supply circuit and extending the product life.

[0023] In the present invention, the electrolysis equipment has a simplified structure and powerful functions, and is more labor-saving and material-saving than similar devices in the prior art, thereby greatly reducing costs and improving the stability of product use.

[0024] The invention can be used for spray disinfection, and the disinfectant can be poured out for cleaning and soaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0026] Attached Figure 1 is a schematic diagram of the present invention;

[0027] Attached Figure 2 is an enlarged schematic diagram of the micro-electrolysis chamber of the present invention;

[0028] Attached Figure 3 is an enlarged schematic diagram of the electrical conductivity of the electrode of the present invention (taking the electrical connection of the anode as an example);

[0029] Attached Figure 4 is a bottom-up schematic diagram of the electrode sheet array of the present invention;

[0030] Attached Figure 5 Schematic diagram of the micro electrolytic chamber of the present invention viewed from above

[0031] In the figure: 1-spray nozzle; 2-electric water pump; 3-pot cavity; 4-illumination device; 5-substrate; 6-micro electrolytic cavity; 7-electrode sheet array; 8-mesh anode; 9-mesh cathode; 10-water inlet pipe of water pump; 11-DC power supply; 12-conductor; 13-water permeable hole; 14-conductor; 15-waterproof glue; 16-electrode surface; 17-bottom plate; 18-insulating glue particles;

[0032] 300-welded column; 400-convex and concave column. DETAILED DESCRIPTION

[0033] like Figure 1-5As shown, a spray pot for producing disinfectant water by direct current electrolysis, wherein a spray nozzle 1, an electric water pump 2, a handheld switch, a pressure relief valve and an electric control unit are arranged in a handheld part above the spray pot; the electric control unit comprises a direct current power supply 11, a circuit board and a display screen, and the electric control unit is also electrically connected to a micro electrolysis chamber 6, an electric water pump and a handheld switch; a pot cavity 3 of the spray pot body can be used to store raw materials and products of disinfectant water, and the pot cavity is communicated with a micro electrolysis chamber 6 arranged below; a substrate 5 is arranged on the upper part of the micro electrolysis chamber, and the substrate and a bottom plate 17 with water permeable holes are connected by snaps to form an electrolysis chamber, and an electrode sheet array 7 composed of mesh anodes 8 and mesh cathodes 9 arranged at intervals and fixedly arranged is arranged in the micro electrolysis chamber; the electrode sheet array is connected to a low-voltage direct current power supply to form a direct current electrolysis device; when producing disinfectant water, the direct current electrolysis device of the spray pot performs low-voltage electrolysis treatment on the brine to generate a sodium hypochlorite solution that can be used for disinfection operations, and keeps the pH value of the liquid environment of the micro electrolysis chamber in an alkaline state.

[0034] The substrate on the upper part of the micro electrolytic chamber is connected to the bottom plate 17 as a whole by snapping, the first lower cover protrusion arranged on the bottom plate presses on the concave-convex column 400 of the substrate, and the second lower cover protrusion presses on the anode at the welding column of the substrate to assist in the firmness and stability of the electrolytic chamber, and the bottom plate 17 and side wall of the micro electrolytic chamber are provided with water-permeable holes 13 communicating with the pot cavity.

[0035] The electrode sheet array includes a titanium-based ruthenium-iridium-plated mesh anode and a titanium-based ruthenium-iridium-plated mesh cathode. The two mesh electrodes are sheet electrodes and are respectively arranged on the concave-convex column and the card slot of the combined concave-convex column under the substrate; the combined concave-convex column is partially connected to the water suction port of the electric water pump, and the other column is provided with a card slot, and the card slot is used to separate the mesh electrodes;

[0036] The low-pressure electrolysis treatment of the salt water is a diaphragm-free electrolysis treatment. When the low-pressure electrolysis treatment is performed, the electrode sheet array is immersed in the salt water so that the salt water contacts the two charged mesh electrode surfaces 16 at the same time, and the water can flow freely between the upper and lower mesh electrodes. The mesh of the cathode mesh electrode placed on the upper layer is larger than that of the anode mesh electrode to facilitate the rapid escape of the generated hydrogen; the interval range between the mesh anode and the mesh cathode is 0.5mm~2.5mm.

[0037] The mesh anode and the mesh cathode are both provided with a conductive part 14 and a mesh-shaped electrolytic part connected to the conductive part; the low-voltage DC power supply outputs a DC power with a voltage range of 1V~24V, and the power is supplied by wires passing through the tall and short welding columns 300 arranged on the substrate and welding with the conductive parts of the mesh anode and the mesh cathode, and the connection points are covered with waterproof glue 15 for protection.

[0038] The substrate on the upper part of the micro-electrolysis chamber is a transparent V-shaped substrate; a lighting device is provided in the micro-electrolysis chamber; a lighting device 4 is provided in the upper part of the V-shaped substrate; when low-pressure electrolysis treatment is carried out, bubbles such as hydrogen generated in the brine in the micro-electrolysis chamber can smoothly bypass the edge of the V-shaped substrate and rise to the pressure relief valve above to be discharged; bubbles such as hydrogen generated by electrolysis can refract or reflect the light of the lighting device, forming a significant visual effect to prompt that the brine electrolysis operation is currently in progress.

[0039] When the direct current electrolysis device finishes electrolyzing the brine in the micro-electrolysis chamber, the liquid environment of the micro-electrolysis chamber is a liquid environment with a pH range of pH 8 to pH 10.

[0040] The salt water in the pot cavity has an initial concentration of not less than 10 g / L. The spray pot is provided with a timer for timing the duration of low-voltage electrolysis. The frequency of the electrolysis treatment is every 3 minutes, and the number of electrolysis times is specifically determined according to the required disinfectant water concentration.

[0041] The sodium hypochlorite solution generated in the micro-electrolysis chamber can be sucked by a controlled electric water pump on a spray pot through a water suction port on a substrate in the electrolysis chamber and sprayed for disinfection through a spray port; the spray pot can also be opened to pour out the sodium hypochlorite solution for cleaning, soaking and other disinfection methods.

[0042] The low-voltage DC power supply includes a rechargeable battery; the electric water pump and the DC electrolysis device are both powered by the low-voltage DC power supply.

[0043] When the mesh anode and the mesh cathode are large-area soft mesh electrodes, the preparation method of the electrode array comprises the following steps:

[0044] Step A1, distributing and attaching mesh anodes and mesh cathodes on both sides of the fork-shaped separation sheet, so that the spacing between the mesh anodes and mesh cathodes meets the spacing range requirements;

[0045] Step A2, selecting a plurality of support positions on the surface of the mesh electrode, dripping a non-conductive glue through the mesh surface of the mesh anode and the mesh cathode at the gaps between the forked separation sheets, so that the glue forms glue droplets connecting the mesh anode and the mesh cathode, and allowing the glue to solidify at rest, forming insulating glue particles 18 at the support positions to lock the positions of the mesh anode and the mesh cathode and to fix the distance between the two;

[0046] Step A3, take out the fork-shaped separation sheet to complete the preparation of the electrode sheet array. The prepared electrode sheet array can be connected to the wire using a copper nose workpiece and locked and fixed.

[0047] Example:

[0048] In this example, the spray bottle uses salt water with a concentration of not less than 5% to prepare disinfectant water. If the user needs to prepare disinfectant water with a high concentration, the concentration of the salt water can be increased.

[0049] First, inject a preset amount of salt water into the spray bottle so that the salt water completely submerges the micro-electrolysis chamber at the bottom of the bottle. Then start the power supply of the spray bottle to electrolyze the salt water in the micro-electrolysis chamber. The electrolysis process generates sodium hypochlorite solution in the micro-electrolysis chamber, and releases the generated sodium hypochlorite solution into the salt water in the pot cavity through the water permeable hole, so that the salt water has the ability to disinfect and sterilize. When the electrolysis time reaches the preset value, the timer of the spray bottle emits a prompt sound.

[0050] During the electrolysis process, hydrogen bubbles are generated and rise from the mesh electrode. The bubbles are refracted by the light from the lighting device, creating a significant visual effect, indicating that electrolysis is currently taking place.

[0051] In this example, the mesh electrodes are fixed on the concave-convex columns on the substrate at intervals, thereby separating the positive and negative electrode sheets from each other, and the concave-convex columns on one of the substrates are jointly supported by the water absorption pipe; the connecting part of the electrode sheet is welded to the wire passing through the welding column of the substrate; the welding point is surrounded and sealed by epoxy resistor glue, so that the current and voltage are directly and safely transmitted to the electrode sheet through the wire; the substrate and the bottom plate (lower cover) are connected by snaps, and the lower cover is in contact with and protects the electrode sheet at the same time.

[0052] During the electrolysis process, since this device is a diaphragm-free electrolysis device, the electrolysis products of the anionic and anodic mesh electrode sheets are recombined after being generated, so that the main components in the solution are mainly sodium hypochlorite and hydrogen (continuously escaping), so that the electrolysis device is always immersed in a solution maintained at a pH of 8-10, reducing the corrosion loss of the electrolysis device and helping to extend the service life of the product.

Claims

1. A spray pot for producing disinfectant water by direct current electrolysis, characterized in that: The handheld part above the spray pot is provided with a spray nozzle, an electric water pump, a handheld switch, a pressure relief valve and an electric control unit; the electric control unit includes a DC power supply, a circuit board and a display screen, and the electric control unit is also electrically connected to the micro electrolysis chamber, the electric water pump and the handheld switch; the pot cavity of the spray pot body can be used to store raw materials and products of disinfectant water, and the pot cavity is communicated with the micro electrolysis chamber arranged below; a substrate is provided on the upper part of the micro electrolysis chamber, and the substrate and the bottom plate with water permeable holes are connected by snaps to form an electrolysis chamber, and an electrode sheet array consisting of mesh anodes and mesh cathodes that are spaced and fixedly arranged is provided in the micro electrolysis chamber; the electrode sheet array is connected to a low-voltage DC power supply to form a DC electrolysis device; when producing disinfectant water, the DC electrolysis device of the spray pot performs low-voltage electrolysis treatment on the brine to generate a sodium hypochlorite solution that can be used for disinfection operations, and keeps the pH value of the liquid environment of the micro electrolysis chamber in an alkaline state; The low-pressure electrolysis treatment of the salt water is a diaphragm-free electrolysis treatment. When the low-pressure electrolysis treatment is performed, the electrode sheet array is immersed in the salt water so that the salt water contacts the surfaces of the two charged mesh electrodes at the same time, and the water can flow freely between the upper and lower mesh electrodes. The mesh of the cathode mesh electrode placed on the upper layer is larger than that of the anode mesh electrode to facilitate the rapid escape of the generated hydrogen; the interval between the mesh anode and the mesh cathode is in the range of 0.5 mm to 2.5 mm; The mesh anode and the mesh cathode are large-area soft mesh electrodes. The preparation method of the electrode array comprises the following steps: Step A1, distributing and attaching mesh anodes and mesh cathodes on both sides of the fork-shaped separation sheet, so that the spacing between the mesh anodes and mesh cathodes meets the spacing range requirements; Step A2, selecting a plurality of support positions on the surface of the mesh electrode, dripping a non-conductive glue through the mesh surface of the mesh anode and the mesh cathode at the gaps where the forked separation sheets are bifurcated, so that the glue forms glue droplets connecting the mesh anode and the mesh cathode, and the glue is allowed to solidify at rest, and insulating glue particles are formed at the support positions to lock the positions of the mesh anode and the mesh cathode and to fix the distance between the two; Step A3, take out the fork-shaped separation sheet to complete the preparation of the electrode sheet array. The prepared electrode sheet array can be connected to the wire using a copper nose workpiece and locked and fixed.

2. A spray pot for producing disinfectant water by direct current electrolysis according to claim 1, characterized in that: The substrate and the bottom plate on the upper part of the micro electrolytic chamber are connected as a whole by snap fasteners. The first lower cover protrusion arranged on the bottom plate presses against the concave and convex columns of the substrate, and the second lower cover protrusion presses against the anode at the welding column of the substrate to assist in the firmness and stability of the electrolytic chamber. The bottom plate and side walls of the micro electrolytic chamber are provided with water-permeable holes communicating with the pot cavity.

3. A spray pot for producing disinfectant water by direct current electrolysis according to claim 1, characterized in that: The electrode sheet array includes a titanium-based ruthenium-iridium-plated mesh anode and a titanium-based ruthenium-iridium-plated mesh cathode. The two mesh electrodes are sheet electrodes and are respectively arranged on the concave-convex columns and the card slots of the combined concave-convex columns under the substrate; part of the combined concave-convex column is connected to the water suction port of the electric water pump, and the other part of the column is provided with a card slot, and the card slots are used to separate the mesh electrodes.

4. A spray pot for producing disinfectant water by direct current electrolysis according to claim 1, characterized in that: The mesh anode and the mesh cathode are both provided with a conductive part and a mesh-shaped electrolytic part connected to the conductive part; the low-voltage DC power supply outputs DC power with a voltage range of 1V~24V, and supplies power by welding wires through high and low welding columns arranged on the substrate and the conductive parts of the mesh anode and the mesh cathode, and the connection points are covered with waterproof glue for protection.

5. A spray pot for producing disinfectant water by direct current electrolysis according to claim 1, characterized in that: The substrate on the upper part of the micro-electrolysis chamber is a transparent V-shaped substrate; a lighting device is provided in the micro-electrolysis chamber; a lighting device is provided in the upper part of the V-shaped substrate; when low-pressure electrolysis treatment is carried out, bubbles such as hydrogen generated in the brine in the micro-electrolysis chamber can smoothly bypass the edge of the V-shaped substrate and rise to the pressure relief valve above for discharge; bubbles such as hydrogen generated by electrolysis can refract or reflect the light of the lighting device, forming a significant visual effect to prompt that the brine electrolysis operation is currently in progress.

6. A spray pot for producing disinfectant water by direct current electrolysis according to claims 1 and 5, characterized in that: When the direct current electrolysis device finishes electrolyzing the brine in the micro-electrolysis chamber, the liquid environment of the micro-electrolysis chamber is a liquid environment with a pH range of pH 8 to pH 10.

7. A spray pot for producing disinfectant water by direct current electrolysis according to claim 1, characterized in that: The salt water in the pot cavity has an initial concentration of not less than 10 g / L. The spray pot is provided with a timer for timing the duration of low-voltage electrolysis. The frequency of the electrolysis treatment is every 3 minutes, and the number of electrolysis times is specifically determined according to the required disinfectant water concentration.

8. A spray pot for producing disinfectant water by direct current electrolysis according to claims 1 and 7, characterized in that: The sodium hypochlorite solution generated in the micro-electrolysis chamber can be sucked by a controlled electric water pump on a spray pot through a water suction port on a substrate in the electrolysis chamber and sprayed through a spray port for disinfection; the spray pot can also be opened to pour out the sodium hypochlorite solution for cleaning or soaking. The low-voltage DC power supply includes a rechargeable battery; the electric water pump and the DC electrolysis device are both powered by the low-voltage DC power supply.

Images