CN210065244U - Ultraviolet lamp - Google Patents

Abstract

The utility model provides an ultraviolet lamp, include: the lamp tube comprises a lamp tube and an electrode, wherein a discharge cavity is arranged in the lamp tube, a thermistor is arranged at a clamping head at the first end of the lamp tube, a holding groove communicated with the discharge cavity is formed in the clamping head, amalgam is stored in the holding groove, and the thermistor heats the amalgam in the holding groove at the clamping head.

Description

Ultraviolet lamp

Technical Field

The utility model relates to an utilize ultraviolet ray to water disinfection, air disinfection and purification field, especially relate to a low pressure ultraviolet lamp that excels in of reinforcing environmental suitability.

Background

For disinfection measures of large-scale sewage, reclaimed water, tap water and drinking water, currently, an ultraviolet lamp is a mainstream disinfection mode, namely, ultraviolet rays are adopted to kill various microorganisms. In addition, for the treatment of industrial sewage treatment, reclaimed water treatment and drinking water with COD exceeding and trace organic matter exceeding, the existing biochemical degradation, ozone degradation, hydrogen peroxide degradation, Fenton advanced oxidation, electrochemistry and other processes have the defects of incapability of degrading all organic matters or high degradation cost, hydroxyl radicals are generated through the synergistic effect of ultraviolet rays and ozone, hydrogen peroxide or ozone and hydrogen peroxide, and the oxidation of various COD and trace organic matters is a new organic matter degradation process, so the ultraviolet advanced oxidation is also one of important methods for degrading organic matters in water treatment.

In the prior art, ultraviolet lamps for water disinfection or organic matter degradation exist, the working principle of the ultraviolet lamps is that electrodes for discharging are arranged at two ends of a lamp tube, mercury vapor is filled in the lamp tube, and when the electrodes discharge the mercury vapor, electrons collide with mercury atoms to generate ultraviolet photons, so that ultraviolet rays are generated. At present, in the field of large-scale water purification and disinfection treatment technologies, a low-pressure high-intensity ultraviolet lamp is usually used as one of the disinfection devices to improve the ultraviolet disinfection efficiency.

It is worth mentioning, however, that uv lamps are used in the field of water purification, since the purification area comprises: working parameters such as water flow and water ultraviolet transmittance change, so that ultraviolet doses required for killing the microorganisms under different working parameters are different. For example, when the water flow rate is low or the ultraviolet transmittance of the water body is high, the required ultraviolet dose is relatively low, and in this case, in order to save energy consumption, the power of the ultraviolet lamp, namely the ultraviolet radiation power, needs to be reduced. Similarly, in the ultraviolet advanced oxidation process, when the ultraviolet transmittance of the water body is increased or the concentration of the ozone/hydrogen peroxide is reduced, in order to optimize the reaction efficiency and reduce the energy consumption, the power of an ultraviolet lamp, namely the ultraviolet radiation power, also needs to be reduced.

In the fields of ultraviolet disinfection and purification of an air supply system and an exhaust system of the aquaculture industry, 185nm and 253.7nm dual-band ultraviolet deodorization and disinfection and prevention and control of infectious disease and epidemic situation of public places, similar problems exist, the temperature difference is large in winter and summer, the wind speed changes, and the radiation power of an ultraviolet lamp is greatly influenced.

Further, the performance index of the ultraviolet lamp was evaluated, as well as the ultraviolet radiation efficiency. According to the working principle of the ultraviolet lamp, in order to keep the ultraviolet radiation efficiency of the traditional low-pressure ultraviolet lamp at a high level, the mercury vapor pressure in the lamp must be close to the optimal mercury vapor pressure adapted to the working condition of the lamp, otherwise, the ultraviolet radiation efficiency of the ultraviolet lamp is greatly reduced. However, since the low-pressure high-intensity uv lamp has a larger current density and a larger number of electrons, and the corresponding optimum mercury vapor pressure value is slightly larger than that of the low-pressure uv lamp, the ultraviolet radiation characteristic of the low-pressure high-intensity uv lamp is more sensitive to the change of the mercury vapor pressure than that of other conventional low-pressure uv lamps, and the ultraviolet radiation power or the ultraviolet radiation efficiency of the low-pressure high-intensity uv lamp is more greatly changed under the condition of a certain range of the mercury vapor pressure change. Therefore, there is a need in the prior art for a new design scheme of an ultraviolet lamp to solve the problem of fluctuation of ultraviolet radiation power of a low-pressure high-intensity ultraviolet lamp, so that the ultraviolet lamp can better adapt to fluctuation of environmental factors such as temperature and flow velocity in a working area.

SUMMERY OF THE UTILITY MODEL

In order to overcome the technical defect, the utility model aims to provide a low-cost ultraviolet lamp can keep higher ultraviolet radiation efficiency under the environmental factor changes such as the temperature of broad, velocity of flow, power regulation.

The utility model discloses an ultraviolet lamp, include: the lamp comprises a lamp tube and an electrode, wherein a discharge cavity is arranged in the lamp tube, a thermistor is arranged at a clamping head at the first end of the lamp tube, a holding groove communicated with the discharge cavity is formed in the clamping head, amalgam is stored in the holding groove, and the thermistor heats the amalgam in the holding groove at the clamping head.

Preferably, the stagnation-accommodating groove is at least one of a flat-bottom groove, an ellipsoid groove, a conical groove, a spheroidal groove or a tubular groove.

Preferably, at least one end of the thermistor lead is connected to one end of each of the electrode leads.

Preferably, both ends of the thermistor are connected to one end of each of the both-end electrode leads, respectively.

Preferably, the thermistor and the stagnation accommodating groove are wrapped with at least one of heat conducting glue or a silica gel sleeve.

Preferably, the stagnation accommodating groove is in direct contact with the thermistor or in indirect contact with the thermistor through a heat conducting material.

After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:

1. the ultraviolet lamp can keep higher ultraviolet radiation efficiency under wider environmental factor changes such as temperature, flow velocity, power adjustment and the like;

2. the structure of the existing ultraviolet lamp does not need to be greatly improved, and the cost is lower.

Drawings

FIG. 1 is a schematic view of the overall structure of the ultraviolet lamp of the present invention;

FIG. 2 is a schematic view of the whole structure of the ultraviolet lamp of the present invention;

FIG. 3 is a schematic view of the whole structure of the ultraviolet lamp with the enclosed outer sleeve according to the present invention;

FIG. 4 is a schematic structural view of a flat bottom groove of the ultraviolet lamp of the present invention;

FIG. 5 is a schematic view of the structure of the quasi-spherical groove of the ultraviolet lamp of the present invention;

FIG. 6 is a schematic view of the structure of the tubular groove of the ultraviolet lamp of the present invention;

FIG. 7 is a schematic view of the structure of the tapered groove of the ultraviolet lamp of the present invention;

fig. 8 is a schematic structural view of an elliptical trough of the ultraviolet lamp of the present invention;

FIG. 9 is a schematic view of the structure of the ultraviolet lamp with an unsealed outer sleeve according to the present invention.

Reference numerals:

100-ultraviolet lamp, 110-lamp tube, 120-electrode, 130-ballast, 140-discharge cavity, 150-amalgam, 160-thermistor, 170-silica gel sleeve, 180-outer sleeve, 151-holding tank, 151A-flat bottom tank, 151B-spheroidal tank, 151C-tubular tank, 151D-pyramidal tank, 151E-ellipsoidal tank, 152-clamping end socket, a1, a2, B1, B2-electrode lead, C1, C2-thermistor lead.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained without creative efforts by those skilled in the art shall belong to the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In order to solve the problem of ultraviolet radiation power fluctuation of low-pressure high-intensity ultraviolet lamp, the utility model discloses in, this ultraviolet lamp is preferably low-pressure high-intensity ultraviolet lamp, and it utilizes amalgam to replace the mercury vapor atmospheric pressure in the liquid mercury control lamp to make low-pressure high-intensity ultraviolet lamp obtain higher ultraviolet radiation efficiency. However, it should be noted that the mercury vapor pressure generated by the amalgam is also varied by changes in ambient temperature, lamp current, and power.

According to the long-term research of the utility model, it is found that the amalgam can better control the mercury vapor pressure in the lamp near the specific mercury vapor pressure, such as 1.0-1.7Pa, when the temperature change delta T is 30-40 ℃. The utility model discloses take this low pressure high strength ultraviolet lamp to take the water disinfection field as an example, the fluctuation delta T of each place or regional temperature is about 30 ℃ in general in-service use, for example the northern regional temperature range in china is 3-30 ℃, the middle part regional temperature range is 5-35 ℃, southern region temperature range is 8-40 ℃, the temperature change leads to the corresponding change of amalgam temperature in the lamp.

On the basis of this, the range of amalgam temperature variation is affected by the difference in thermal conductivity caused by the dimensions of the jacket and the tube of the uv lamp and the difference in the design temperature of the tube wall of the lamp, so the formula for the amalgam temperature variation is Δ T ＊ k, where Δ T is the water temperature variation range and k is a specific coefficient, typically between 0.8 and 1.2. for example, if the lamp current or lamp power is adjusted in the range of 60-100%, resulting in an amalgam temperature variation range of about 25 ℃, the amalgam temperature variation Δ T, which is a composite superposition, is about 55 ℃ (i.e. 30 ℃ +25 ℃) when the water temperature and lamp power vary, e.g. in the extreme case of 5 ℃ water temperature, 60% of the full load of the uv lamp power, and 85 ℃ amalgam temperature, or in the other extreme case of 35 ℃ water temperature, 100% of the full load of the uv lamp power, and 140 ℃ of the amalgam temperature, it is seen that the amalgam temperature variation of the amalgam temperature reaches 55 ℃ in both extreme cases.

Therefore, one of the main improvements of the present invention is that the temperature of the amalgam needs to be controlled to stabilize the temperature range of the amalgam. Therefore, an aspect of the present invention provides an implementation method, such as: the temperature of the amalgam is maintained in a certain specific range by additionally arranging a small heating device (such as a heating wire), a temperature sensor and a control circuit in the ultraviolet lamp.

Although the technical means of the scheme can solve the problem of amalgam temperature control to a certain extent, the implementation cost is high, meanwhile, in order to be compatible with other equipment, a double-lamp-head structure is often needed, a plurality of parts are added in the lamp head, the structure becomes complicated, and the probability of failure of a control circuit is greatly increased if the control circuit is in a relatively high-temperature environment of 80-100 ℃ for a long time.

In addition, if the adjustment range of the lamp current or the lamp power is extended to 30-100% of the full load, under the condition that the temperature change delta T of the amalgam caused by the composite superposition of the water temperature change and the power adjustment change is more than or equal to 65 ℃, the heating temperature control device still cannot realize accurate temperature control due to the influence of heat conduction, so that the temperature of the amalgam not only needs to be controlled, but also a proper amalgam proportion needs to be selected, the design parameters of the lamp need to be matched and adjusted, and the content of the part is the technical blank in the field.

Thus, to further give a preferred embodiment, referring to fig. 1 to 9, the present invention provides the following preferred examples, wherein the ultraviolet lamp has an overall structure as schematically shown in fig. 1 to 3, and the ultraviolet lamp 100 is used for disinfecting water, sterilizing microorganisms in water by irradiating ultraviolet rays, or promoting degradation of organic matters in water. In this embodiment, the ultraviolet lamp 100 is a low pressure high intensity ultraviolet lamp, i.e., the pressure in the lamp is low, and the current density during operation is preferably greater than 0.13 amperes per square centimeter. The ultraviolet lamp 100 includes:

a lamp tube 110

The lamp tube 110 is a main structure of the ultraviolet lamp 100, and is usually made of transparent quartz glass, and the inside thereof is a closed structure to form a discharge chamber 140. The discharge chamber 140 is filled with mercury vapor emitted by the amalgam in an operating state. The lamp tube 110 has clamping heads 152 at both ends thereof, and the clamping heads 152 can be connected to electronic components, such as the electrodes 120 and the thermistor 160, in a sealed state.

-electrode 120

The electrodes 120 are disposed at both ends of the lamp tube 110 to be opposite to each other for discharge.

Ballast 130

The ballast 130 is a common electrical control device on the lamp, is common knowledge in the art, and therefore will not be described in detail herein, and in a preferred embodiment the ballast 130 can adjust the output power of the ultraviolet lamp. In this embodiment, the ballast 130 is respectively connected to the two electrodes 120, and supplies power to the two electrodes 120, and the electrodes 120 discharge the mercury vapor in the discharge cavity 140 to form ultraviolet rays.

-amalgam 150

The amalgam is also called amalgam, is granular, is convenient to recover compared with liquid mercury, and avoids environmental pollution. Fig. 1 to 3 further show the relevant construction of the amalgam 150, the amalgam 150 being stored in a holding tank 151. The stagnation-holding groove 151 is disposed at the first end of the lamp tube 110 and is communicated with the discharge cavity 140, so that mercury vapor volatilized from the amalgam 150 can reach the discharge cavity 140.

The first end is preferably the end of the lamp tube 110 having the holding groove 151, and may be replaced in practical variations or combinations, for example, on the same side as the ballast 130 or on a different side from the ballast 130. In order to achieve a better effect of maintaining an optimum mercury vapor pressure, the composition of the amalgam comprises: bismuth, indium, tin, mercury, wherein the proportion of mercury is 2.0% to 2.5% to carry out appropriate ratio adjustment according to the difference of operating mode, it is different according to the ratio, the utility model discloses an amalgam formula can control mercury vapor pressure at 90 ℃ -135 ℃ within range betterly, and this temperature region matches with the operating temperature of low pressure high-strength ultraviolet lamp holder head 152 department thermistor 160 easily.

It should be noted that, as shown in fig. 1 to 3, in the preferred embodiment, the stagnation-accommodating groove 151 extends integrally from the sealing clip 152, and specifically, the stagnation-accommodating groove 151 may be defined by a bowl-shaped groove extending from one side of the sealing clip 152 close to the discharge cavity 140 to support the amalgam 150 therein. However, the embodiment is not limited thereto, and the stagnation-accommodating groove 151 may be a separate component connected to the clamp head 152 near the discharge chamber 140.

In other preferred embodiments, as shown in fig. 4 to 9, the stagnation-accommodating groove 151 may be a groove body having any one of a flat-bottom groove 151A, a quasi-spherical groove 151B, a tubular groove 151C, a conical groove 151D, or an ellipsoidal groove 151E, so as to accommodate the amalgam 150 and be in communication with the discharge cavity 140 to allow the mercury to flow between the discharge cavity 140 and the stagnation-accommodating groove 151.

Furthermore, in order to prevent the amalgam 150 from flowing into the discharge chamber, in a preferred embodiment, the opening direction of the holding groove 151 is substantially upward or upward in an operating state, or the placing direction of the ultraviolet lamp 100 can be optionally limited, i.e., the lamp tube 110 is placed horizontally, the holding groove is upward or vertically placed toward the lower lamp tube, so as to prevent the amalgam 150 from leaking out of the holding groove 151.

A thermistor 160

Compared with the prior art, the present invention is improved by using the thermistor 160 and the integration of the thermistor and the lamp tube structure, wherein the thermistor 160 is disposed at the first end of the lamp tube 110, as shown in fig. 1 and 2, the electrical connection end of the thermistor 160, i.e., the C1 and the C2 end, is connected to the a1, a2, b1, and b2 ends of the two electrodes 120 respectively, e.g., the C1 is connected to the a1 or a2 ends, and the C2 is connected to the b1 or b2 ends, and the ballast 130 supplies power, specifically, the ballast switching power supply supplies power, and the number of connection wires between the lamp tube and the ballast is reduced. Therefore the utility model discloses the preferred adoption uses thermistor 160's the both ends that connect electricity respectively with electrode both ends pin connection to make this hot door resistance 160's voltage be fluorescent tube voltage or fluorescent tube voltage with the electrode voltage, can effectively reduce the connecting wire quantity between fluorescent tube and the ballast, thereby the existing power of make full use of and the characteristics of fluorescent tube structure are laid and are fused and make the fluorescent tube after the improvement have better an organic whole nature structure, and can be suitable for multiple ballast. The thermistor 160 of the present embodiment is preferably a positive temperature coefficient thermistor, also called PTC, whose resistance value increases with the increase of temperature.

Wherein in a preferred embodiment, the thermistor 160 is enclosed in the sealing head 152 and is in direct contact with the amalgam 150 in the stagnation-containing groove 151 or is in contact with the amalgam 150 through a heat-conducting material, for example, if the thermistor is in direct contact, in a preferred embodiment, as shown in fig. 1 to 2, the thermistor 160 has a structural shape of containing the stagnation-containing groove 151, while in another preferred embodiment, as shown in fig. 3, the thermistor 160 can also have a structural shape of being arranged in a sheet-like manner in the sealing head 152 and extending at least partially in the stagnation-containing groove 151; if it is contacted by a heat conductive material, such as a silicone sleeve 170 made of heat conductive glue, the heat conductive material is disposed between the thermistor 160 and the holding tank 151. On the other hand, the thermistor 160 can be installed in the lamp by selecting a thermistor with a suitable size according to the inner size of the lamp tube 110, and thus will not be described in detail herein. It should be noted that the arrangement of the heat conducting material is to achieve a better heat preservation effect, so that in this embodiment, it is preferable that the thermistor 160 and the stagnation accommodating groove 151 are wrapped by the silicone sleeve 170 or other heat conducting glue in the prior art, so that the thermistor and the stagnation accommodating groove can be in close contact with each other, the heat conducting effect is enhanced, and the temperature of the amalgam 150 is stabilized.

It is worth mentioning that when the thermistor temperature is higher than its curie temperature due to environmental factors, the resistance value is large and the thermistor 160 generates almost no heat energy. When the environment changes and the temperature of the thermistor is lower than the curie temperature, the thermistor 160 generates heat after being electrified, so that the amalgam 150 can be heated, the amalgam 150 is maintained at a proper temperature, and the mercury vapor pressure in the discharge cavity 140 is maintained. In order to match the operating environment of the uv lamp 100, the parameters of the thermistor 160 must also be defined, and the curie temperature thereof ranges between [ T1+ (T2-T1)/5] and [ T1+4 + (T2-T1)/5], where T1 and T2 are respectively the minimum operating temperature and the maximum operating temperature of the amalgam 150 in a continuous region of 90% to 100% of the uv radiation power at 100% of the input power of the uv lamp. The curie temperature of the thermistor is the temperature as a critical point, and for the thermistor with a positive temperature coefficient, when the temperature is lower than the critical point, the resistance value of the thermistor is influenced by the temperature and changes very slowly; when the temperature exceeds the critical point, the resistance value of the thermistor increases sharply with temperature change.

In a preferred embodiment, the minimum operating temperature T1 of the amalgam 150 is 90 ℃ and the maximum operating temperature T2 of the amalgam 150 is 120 ℃ at 90% to 100% of the uv radiation power of the uv lamp, and the curie temperature of the thermistor 160 is calculated to be in the range of 96 ℃ to 114 ℃ according to the above formula. The utility model discloses in other embodiments, according to the difference of operating mode, the scope of Curie temperature can be 90 ℃ to 135 ℃ to the output power scope of different temperature environment of adaptation and broad.

The above structural improvements do not require major modifications to the ultraviolet lamp 100, are relatively low in cost, and do not take up too much structural space. After the structure is adopted, the thermistor 160 can compensate the environmental temperature of the amalgam 150, when the environmental temperature rises, the thermistor 160 can rise temperature to cause the resistance value to rise, and as the voltage of the lamp tube is relatively stable, under the condition of certain voltage according to ohm's law, the higher the resistance is, the lower the electric power is, the heat release of the thermistor 160 is reduced, and the heating of the amalgam 150 is reduced; on the contrary, when the ambient temperature decreases, the thermistor 160 will decrease in temperature to decrease the resistance value, and the electric power increases, which increases the heat release of the thermistor 160, thereby increasing the heating of the amalgam 150, and finally maintaining the amalgam 150 in a stable temperature range, which indirectly maintains the mercury vapor pressure in the discharge cavity 140 near the optimal mercury vapor pressure value, and ensures a higher ultraviolet radiation efficiency.

Further, the ultraviolet lamp 100 further includes an outer sleeve 180 hermetically connected to the lamp tube 110, wherein it should be noted that the outer sleeve 180 may preferably be a closed outer sleeve as shown in fig. 3, and the sealing portion of the outer sleeve 180 may be closed by a sealing head 152 structure so as to hermetically accommodate the lamp tube 110, although the outer sleeve 180 is not shown in fig. 1 and fig. 2, a person skilled in the art may find a corresponding combination according to an understanding of the present embodiment, and thus, the details are not described herein. However, in another preferred embodiment, the outer sleeve 180 can be an unsealed outer sleeve as shown in FIG. 9, which has an opening for the lamp tube 110 to enter and exit.

The distance between the inner side wall of the outer sleeve 180 which is closed or not closed and the outer side wall of the lamp tube is preferably 1.0mm to 5.0mm, the lead is fixed by a rubber ring outside the lamp tube, the lead is prevented from moving, a gap of 1.0mm is needed, when the gap exceeds 5.0mm, the outer sleeve is large in size and high in cost, the gap of 1.0mm to 5.0mm is enough for meeting the distribution of a thermal field between the gaps, and the outer sleeve is suitable for various environmental conditions. And the lamp tube 110 and the outer sleeve 180 are made of quartz which can transmit 253.7nm ultraviolet rays or 185nm ultraviolet rays and 253.7nm ultraviolet rays simultaneously. When quartz, which transmits 253.7nm ultraviolet radiation, is used, the ultraviolet lamp has 253.7nm ultraviolet radiation output. When quartz which transmits 185nm and 253.7nm ultraviolet rays simultaneously is used, the ultraviolet lamp has 185nm and 253.7nm ultraviolet ray outputs, at least one of inert gas or nitrogen is filled between the lamp tube 110 and the outer sleeve 180, and the gas containing the inert gas or nitrogen can be a gas commonly used in the technical field such as specific: argon, nitrogen, argon 5: mixed gas of nitrogen 5, argon 5: the mixed gas of neon 5 can be used for sterilizing drinking water and degrading trace organic matters, and can also be used for sterilizing water and removing residual chlorine in families or rooms. The outer sleeve 180 can enhance the heat preservation effect of the mercury vapor in the lamp tube 110, and is beneficial to maintaining the stability of the mercury vapor pressure.

Therefore, according to the above technical solution, those skilled in the art can understand that the ultraviolet lamp provided by the present invention has the advantages of strong environmental adaptability, large power regulation range of the ultraviolet lamp, high ultraviolet radiation efficiency, etc., and is realized by selecting the curie temperature of the thermistor and matching the operating temperature with the amalgam of the specific formula.

Although the precision of the thermistor 160 for heating the amalgam 150 at a constant temperature is not as high as that of a dedicated heating device, a temperature sensor and a control circuit, and may cause a certain deviation of the amalgam temperature, such as + -5 ℃, the amalgam 150 with a specific formula provided by the utility model can ensure that the mercury vapor pressure in the lamp is always near the optimal mercury vapor pressure value within the narrow temperature variation range, thereby improving the ultraviolet radiation efficiency of the ultraviolet lamp.

Furthermore, the utility model discloses a thermistor 160 power supply line is simple, and the lead wire is few, and ultraviolet lamp's overall structure is succinct high-efficient very, and implementation cost is lower simultaneously, and the performance parameter effect that gains is more excellent, has filled the blank of the technique in the field to solved the ultraviolet radiation efficiency fluctuation problem of low pressure ultraviolet lamp that excels in, environmental factor such as the adaptation work area's that makes it can be better temperature, velocity of flow, accent power is undulant, has improved ultraviolet disinfection's efficiency, suitable popularization, and have higher commercial using value.

In order to verify the technical scheme of the utility model discloses technical scheme's technological effect, utility model people have still made two sets of contrast tests, see the following in detail.

Test one:

this experiment has adopted two kinds of ultraviolet lamp to be applied to the water disinfection, one kind is that the ultraviolet lamp that does not contain thermistor is called scheme A, and the other kind is the utility model discloses the ultraviolet lamp that is provided with thermistor that technical scheme corresponds is called scheme B. The power of two ultraviolet lamp tubes is 150W, the outer diameter of a quartz glass tube is 19mm, the length of a discharge arc is 1000mm, the outer diameter of an outer sleeve is 28mm, the 253.7nm transmittance of the quartz glass tube is 90%, the ultraviolet lamp tube is In non-sealing connection with the outer sleeve, the distance between the inner side wall of the outer sleeve and the outer side wall of the lamp tube is 3.0mm, ballasts with the stable current of 1.5A are adopted to drive the lamps to work, amalgam is Bi-In-Sn-Hg alloy with the mercury proportion of 2.5%, the corresponding working temperatures T1 and T2 In a continuous region with the ultraviolet radiation power of 90% -100% are respectively 90 ℃, 120 ℃ and the Curie temperature of a thermistor is 100 ℃. Wherein thermistor and hold groove 151 that stagnates are located the clamp cover homonymy (all be located the first end of fluorescent tube promptly) in scheme B, have heat conduction silica gel between the two, and thermistor and hold groove 151 that stagnates and adopt temperature resistant silica gel cover parcel. The reference conditions and test results for both protocols are as follows:

wherein, the sterilization efficiency corresponding to 30% water flow when the input power of the lamp is 30% is obtained by calculating the ultraviolet dose by combining the biological dose verification data at the typical water temperature of 20 ℃ and the ultraviolet radiation power of the ultraviolet lamp at the water temperature of 5-40 ℃. Therefore, when the thermistor is not arranged to adjust the input power of the lamp (scheme A), the amalgam temperature is lower under the states of low power (30%) and low water temperature (5 ℃), the mercury vapor pressure in the lamp is far smaller than the optimal mercury vapor pressure, and the ultraviolet radiation efficiency is low. After the thermistor is arranged, the ultraviolet lamp can still keep higher sterilization efficiency under wider water temperature change range and wider power range, and the ultraviolet lamp has obvious improvement effect.

In the first experiment, the ultraviolet lamp tube and the outer sleeve in the scheme B are made of quartz glass tubes with 253.7nm transmittances of 90% and 185nm transmittances of 68%, the ultraviolet lamp tube and the outer sleeve are hermetically connected, a mixed gas of argon and nitrogen with 0.8 atm pressure is filled in the middle, the ratio of argon to nitrogen is 5: 5, and the ultraviolet lamp has 185nm and 253.7nm outputs simultaneously, so that the ultraviolet lamp not only can kill microorganisms in water, but also has the functions of removing residual chlorine in water and decomposing trace organic matters.

In the first experiment, the ultraviolet lamp in the scheme B is driven by the ballast with the stable current of 1.0A, so that the ultraviolet lamp can be suitable for sterilizing an air supply system of the breeding industry with the ambient temperature of-20-35 ℃ and the air speed of 2-5m/s, and the ultraviolet radiation efficiency of the ultraviolet lamp is not lower than 30%.

And (2) test II:

the test adopts two ultraviolet lamps, one ultraviolet lamp does not contain a thermistor and is called as scheme C, and the scheme adopts a heating temperature control assembly; the other is the ultraviolet lamp provided with the thermistor corresponding to the technical scheme of the utility model, which is called scheme D. The power of the two ultraviolet lamp tubes is 250W, the outer diameter of the quartz glass tube is 19mm, the length of the discharge arc is 1470mm, the two ultraviolet lamp tubes are driven to work by a ballast with the stable current of 1.8A, the amalgam is Bi-In-Sn-Hg alloy with the mercury proportion of 2.0 percent, and the corresponding working temperatures T1 and T2 In a continuous region with the ultraviolet radiation power of 90-100 percent are respectively 95 ℃ and 125 ℃. Wherein, the heating temperature control assembly in the scheme C is set to control the temperature to 105 ℃; scheme D, the thermistor and the hysteresis accommodating groove 151 are located on two sides of the center of the clamp seal and are tightly attached to the clamp seal surface, heat-conducting silica gel is arranged between the thermistor and the clamp seal preset groove, and the thermistor and the clamp seal preset groove are wrapped by a temperature-resistant silica gel sleeve. The reference conditions and test results for both protocols are as follows:

wherein, the sterilization efficiency corresponding to 30% water flow when the input power of the lamp is 30% is obtained by calculating the ultraviolet dose by combining the biological dose verification data at the typical water temperature of 20 ℃ and the ultraviolet radiation power of the ultraviolet lamp at the water temperature of 5-40 ℃. It is thus clear that for scheme C, the utility model discloses scheme accuse temperature device is simple, and the lamp holder external diameter is little, and length is short, and is with low costs, the same with ordinary lamp holder, does not need special design's ballast, and ultraviolet lamp is under different water temperature, different power, and ultraviolet radiation efficiency equals scheme C, reaches equally good bactericidal efficiency. On the other hand, the outer sleeve of the scheme C needs to adopt an enlarged transition structure or increase the diameter of the outer sleeve, so that the cost is increased, and the matching compatibility with general equipment is poor. The utility model discloses the scheme need not change the outer tube structure, and is compatible good with general equipment.

To sum up, the utility model discloses middle-low pressure high strength ultraviolet lamp adopts positive temperature coefficient's thermistor to heat amalgam and keep a constant temperature, and lamps and lanterns have environmental suitability (temperature, velocity of flow), ultraviolet lamp power control range big (for 30-100% of rated power), ultraviolet radiation efficiency height, advantage with low costs. The thermistor in the low-voltage high-strength ultraviolet lamp adopts the voltage supply at two ends of the electrode of the ultraviolet lamp, has simple structure, few leads and strong adaptability with the ballast.

It should be noted that the embodiments of the present invention have better practicability and are not intended to limit the present invention in any way, and any person skilled in the art may change or modify the technical contents disclosed above to equivalent effective embodiments, but all the modifications or equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

Claims (5)

1. An ultraviolet radiation lamp comprising: fluorescent tube, electrode, be equipped with the discharge chamber in the fluorescent tube, its characterized in that: the lamp tube is characterized in that a thermistor is arranged at a clamping head at the first end of the lamp tube, a holding stagnation groove communicated with the discharge cavity is formed in the clamping head, amalgam is stored in the holding stagnation groove, and the thermistor heats the amalgam in the holding stagnation groove at the clamping head.

2. The ultraviolet radiation lamp defined in claim 1, wherein: the stagnation accommodating groove is at least one of a flat-bottom groove, an ellipsoid groove, a conical groove, a sphere-like groove or a tubular groove.

3. The ultraviolet radiation lamp defined in claim 1, wherein: at least one end of the thermistor lead is connected with one end of each electrode lead.

4. The ultraviolet radiation lamp defined in claim 1, wherein: the thermistor and the stagnation accommodating groove are wrapped with at least one of heat conducting glue or silica gel sleeves.

5. The ultraviolet radiation lamp defined in claim 3, wherein: the stagnation accommodating groove is in direct contact with the thermistor or in indirect contact with the thermistor through a heat conducting material.

Images