CN100576422C - double electrode fluorescent tube - Google Patents

Abstract

A double-electrode fluorescent tube. Two electrodes are respectively installed on the electrode brackets at both ends of the fluorescent tube. According to the condition of low pressure of the fluorescent tube, the two electrodes on the electrode bracket at each end of the tube are mainly composed of electrodes with small resistance values. A physical phenomenon of cathode discharge makes the service life of the electrodes of the double-electrode fluorescent tube nearly double that of the prior art single-electrode fluorescent tube. Since the service life of the fluorescent tube depends on the service life of the electrodes, it is effective The working life of the fluorescent tube is greatly prolonged, the price-performance ratio of the fluorescent tube is improved, and the structure is simple.

Description

double electrode fluorescent tube

technical field

The invention relates to an electrode support device of a fluorescent lamp, in particular to a double-electrode fluorescent lamp.

Background technique

The performance of electrodes for fluorescent lamps is one of the key factors affecting the life of fluorescent lamps. Since the advent of fluorescent lamps, people have continued to conduct research on electrode materials, shapes, structures, winding methods, electrode electron emission materials (electron powder) composition and coating methods, and the decomposition and activation process of electrode emission materials during the exhaust process. Research, in order to improve the technical performance of lamp electrodes, and make continuous progress in reducing the escape power of electrode electron emission materials and ion bombardment resistance, so that the technical performance of existing fluorescent lamp electrodes is continuously improved, and the service life of the lamp reaches 8000 ~12000 hours. However, the phenomenon of "sputtering" and "evaporation" generated during the ignition process of the lamp tube make the actual service life of the fluorescent lamp far from the calculated service life, thus reducing the price-performance ratio of the fluorescent tube.

Contents of the invention

The object of the present invention is to provide a double-electrode fluorescent lamp with long electrode service life and high function-cost ratio.

The purpose of the present invention can be realized by the following technical measures: two filaments are respectively installed on the two fixed electrode guide wires on the electrode support stem, coated with electronic powder to form an electrode support with two electrodes, and two electrodes with two The electrode brackets of the two electrodes are respectively put into the two input ends of the lamp tube, and the bell mouths of the two electrode brackets with the two electrodes are sealed and fixedly connected with the two input ends of the lamp tube respectively.

There are four fixed electrode guide wires A, A1, B, B1 on the stem of the electrode holder, A is connected to A1, B is connected to B1, one filament is installed on the fixed electrode guide wires A and B, and the other filament is installed on the fixed electrode The guide wires A1 and B1 are coated with electronic powder to form an electrode holder with two electrodes, and the bell mouths of the two electrode holders with two electrodes are sealed and fixedly connected to the two input ports of the lamp tube respectively.

The E-shaped metal shielding screen is installed on the independent guide wire of each electrode bracket core column, respectively surrounds the two electrodes on the bracket, and the screen is not connected to the circuit.

The beneficial effects of the present invention are: according to the two filaments respectively installed on the electrode brackets at both ends of the fluorescent tube, after coating the electronic powder, the electrode brackets at each end of the lamp tube have two electrodes, and under the condition of low air pressure in the fluorescent tube, mainly by the resistance The physical phenomenon of cathode discharge with a small value makes the service life of the electrodes of the double-electrode fluorescent tube nearly double that of the prior art single-electrode fluorescent tube, because the service life of the fluorescent tube depends on the service life of the electrodes Therefore, the service life of the fluorescent tube is effectively extended, the price-function ratio of the fluorescent tube is improved, the structure is simple, and the cost is small.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural schematic diagram of installing two electrodes with two fixed electrode guide wires on the core column of the electrode holder;

Fig. 2 is a structural schematic diagram of installing two electrodes on four fixed electrode guide wires on the core column of the electrode holder;

Fig. 3 is a structural schematic diagram of placing an E-shaped metal screen on a double-electrode bracket;

Detailed ways

In Fig. 1, two filaments 6, 7 are respectively installed on the fixed electrode guide wire 4 and the fixed electrode guide wire 5 on the stem column of the electrode support 2, and the two filaments 12, 13 are installed on the fixed electrode guide wire 5 on the stem column of the electrode bracket 3 respectively. On the electrode guide wire 10 and the fixed electrode guide wire 11, after the four filaments are respectively coated with electronic powder, the electrode support 2 and the electrode support 3 have two electrodes respectively, and the electrode support 2 and the electrode support 3 are put into the two sides of the phosphor tube. In the two input ends, the bell mouths 9 and 14 of the stem are respectively sealed and fixedly connected with the two input ports 8 and 15 of the powder tube of the fluorescent lamp, and are processed into finished tubes of the double-electrode fluorescent lamp through other lamp-making processes. Due to the physical process of starting the fluorescent tube, under the action of the effective voltage, the gas between the electrodes at both ends of the tube first undergoes electrical breakdown, then causes glow discharge, and then transfers from glow discharge to arc discharge, forming thermions The arc finally reaches local equilibrium, and the fluorescent lamp ignites normally. The main reason for the loss of cathode emission materials is sputtering and evaporation. When the electrode explodes and the temperature rises during startup, it will cause a large piece of cathode emission material to peel off, which will significantly reduce the storage capacity of the coating. The normal ignition is the cause of the evaporation of the oxide material. The working life of a fluorescent lamp is actually determined by the electrodes, when the cathode cannot get a rich thermal emission from the oxide coating, the lamp is either not easy to start, or "stranded" on the glow discharge, which will make all remaining The cathode material is quickly splattered, and the lamp is considered broken. Therefore, effectively increasing the storage capacity of the oxide coating after decomposition and activation can effectively prolong the service life of the electrode. Experiments have found that two electrodes are respectively installed on the electrode brackets at both ends of the fluorescent tube. Under the condition of low pressure inside the tube, the cathode discharge is mainly performed by an electrode with a small resistance at each end. Practice shows that the core column of the electrode bracket at each end There are two cathode coatings on the electrode support core column at each end of the prior art, which is doubled, thereby effectively prolonging the service life of the electrodes and effectively improving the working life of the fluorescent tube. The double-electrode bracket is suitable for the application of straight, ring, compact and combined fluorescent lamps. The diameter of the lamp tube is Φ12～Φ32, and the power of the lamp tube is 15W～300W.

In Fig. 2, there are four fixed electrode guide wires A, A1, B, B1 on the core column of the electrode support at each end, A is connected to A1, B is connected to B1, the filament 4 is installed on the fixed electrode guide wires A and B, and the filament 5 Install on the fixed electrode guide wires A1 and B1, apply electronic powder, so that there are two electrodes on the electrode support 2 and electrode support 3 respectively, and put the electrode support 2 and electrode support 3 into the two inputs of the powder tube 1 of the fluorescent lamp respectively In the end, the bell mouths of the two electrode brackets are respectively sealed and connected with the two input ends of the lamp tube, and processed into a finished lamp tube of a double-electrode fluorescent lamp through other lamp-making processes. Its working principle is the same as that in Figure 1.

As shown in FIG. 3 , the E-shaped metal shield 15 is fixed on the independent guide wire 14 on the stem of the electrode support 2 , and the E-shaped metal shield 17 is fixed on the independent guide wire 16 on the stem of the electrode support 3 . The E-shaped metal screen 15 surrounds the electrodes 4 and 5 on the electrode holder 2 respectively, and the screen is disconnected from the circuit. The E-shaped metal screen 17 surrounds the electrodes 6 and 7 on the electrode holder 3 respectively, and the screen is disconnected from the circuit. During the start-up and normal ignition of the fluorescent tube, the E-shaped metal screen effectively prevents two electrodes on the same electrode bracket from polluting each other and preventing the cathode from evaporating the tube wall. device, most of the current must be received by the transmitting coil itself, and this part of the power is a large part of the energy required to heat the transmitting coil. Adding an E-shaped metal screen will reduce the arc section near the anode and increase the plasma. The current density, thus also increases the electron density near the cathode, which also reduces the cathode drop, effectively improving the efficiency of the fluorescent tube.

Claims (2)

1. double-electrode fluorescent lamp, it is characterized in that: two fixed electrode seal wires on the electrode suppor stem stem are installed two filaments respectively, coat the electronics powder, make on the electrode suppor and have two strip electrodes, and have the electrode suppor horn mouth of two strip electrodes and two input ports of fluorescent tube are sealedly and fixedly connected respectively with two, tube diameter is Φ 12～Φ 32, and power of lamp tube is 15W～300W; E shape metal baffle plate is installed on the independent seal wire of each electrode suppor stem stem, and respectively with two electrodes surrounding on this support, screen is obstructed with circuit.

2. double-electrode fluorescent lamp, it is characterized in that: four fixed electrode seal wire A, A1, B, B1 are arranged on the electrode suppor stem stem, electrode seal wire A is connected with A1, electrode seal wire B is connected with B1, article one, filament is installed on fixed electrode seal wire A and the B, another filament is installed on fixed electrode seal wire A1 and the B1, makes on the electrode suppor to have two strip electrodes, and the electrode suppor horn mouth of two strip electrodes and two input ports of fluorescent tube are sealedly and fixedly connected respectively; E shape metal baffle plate is installed on the independent seal wire of each electrode suppor stem stem, and respectively with two electrodes surrounding on this support, screen is obstructed with circuit.

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