阅读说明：本技术 一种热风负压循环干燥系统 (Hot air negative pressure circulation drying system ) 是由 屈瑶 刘国方 于 2019-09-11 设计创作，主要内容包括：本发明提供一种热风负压循环干燥系统,所述干燥系统包括燃烧室、离心式进风机、进风管、烘箱和回风管,所述燃烧室的进风端一连接进风口用于产生初始热风,所述燃烧室的进风端二连接回风管用于回收热风,所述燃烧室出风端与离心式进风机连接产生负压,用于吸取初始热风和回收热风混合后完成主动匀风,所述离心式进风机的出风端通过进风管与烘箱连接送入温度分布均匀的热风,所述烘箱出风端通过回风管与燃烧室连接用于热风的回收。本发明改变了干燥过程中热风循环路径,通过负压方式,提高管路及烘箱内热风分布均匀性,减少温度偏差,改善热风回收循环利用,降低能源消耗。(The invention provides a hot air negative pressure circulation drying system which comprises a combustion chamber, a centrifugal air inlet machine, an air inlet pipe, an oven and an air return pipe, wherein the air inlet end of the combustion chamber is connected with an air inlet for generating initial hot air, the air inlet end of the combustion chamber is connected with the air return pipe for recovering the hot air, the air outlet end of the combustion chamber is connected with the centrifugal air inlet machine for generating negative pressure for absorbing the initial hot air and completing active air uniformization after the initial hot air and the recovered hot air are mixed, the air outlet end of the centrifugal air inlet machine is connected with the oven through the air inlet pipe for feeding the hot air with uniform temperature distribution, and the air outlet end of the oven is connected with the combustion chamber through the air return pipe for recovering. The invention changes the hot air circulation path in the drying process, improves the hot air distribution uniformity in the pipeline and the oven by a negative pressure mode, reduces the temperature deviation, improves the hot air recycling and reduces the energy consumption.)

1. The utility model provides a hot-blast negative pressure circulation drying system, includes the support, this drying system is fixed in on the support, drying system includes combustion chamber, air-supply line, oven and return air duct, its characterized in that: the air-conditioning system is characterized by further comprising a centrifugal air inlet machine, the combustion chamber, the centrifugal air inlet machine, an air inlet pipe, the drying oven and an air return pipe can form a sealed circulating system, an air inlet end of the combustion chamber is connected with an air inlet and used for receiving cold air, the cold air is heated in the combustion chamber to generate initial hot air, an air inlet end of the combustion chamber is connected with the air return pipe and used for recovering the hot air, an air outlet end of the combustion chamber is connected with the centrifugal air inlet machine to generate negative pressure and used for absorbing the initial hot air and recovering the active uniform air after the hot air is recovered, an air outlet end of the centrifugal air inlet machine is connected with an air inlet end of the drying oven through the air inlet pipe and used for feeding the hot air uniformly.

2. The heated air negative pressure circulation drying system of claim 1, wherein: an air uniformizing frame is arranged in the air inlet pipe, and a rotatable air uniformizing disc is arranged on the air uniformizing frame.

3. the heated air negative pressure circulation drying system of claim 1, wherein: and a pipe joint is connected between the centrifugal air inlet fan and the air inlet pipe, and the pipe joint is a trapezoidal pipe joint.

4. The heated air negative pressure circulation drying system of claim 1, wherein: the air conditioner is characterized in that a pipe joint is connected between the centrifugal air inlet machine and the air inlet pipe, an air volume adjusting pipe is arranged in the pipe joint and comprises an air inlet, an air outlet I and an air outlet II, the air inlet is connected with the air outlet end of the centrifugal air inlet machine, the air outlet I is connected with the air inlet end of the air inlet pipe, the air outlet II is communicated with the outside, and an adjusting valve is arranged on the air outlet II.

5. The heated air negative pressure circulation drying system of claim 1, wherein: the air inlet pipe is a Y-shaped air inlet pipe, a hose connector is arranged at the air outlet end of the air inlet pipe, an inclined connector is arranged at the rear end of the hose connector, and the inclined connector is connected with the air inlet end of the oven.

6. The heated air negative pressure circulation drying system of claim 1, wherein: one side of the air outlet end of the air return pipe is connected with the combustion chamber and used for returning air, the other side of the air outlet end of the air return pipe is connected with an exhaust pipe and used for exhausting air, an electric adjusting valve is arranged on the exhaust pipe, and an air exhaust fan is arranged at the air outlet end of the exhaust pipe.

7. The heated air negative pressure circulation drying system of claim 6, wherein: the upper end of the support is provided with a first support platform, the combustion chamber is arranged on the first support platform, a second support platform is arranged below the first support platform, and the exhaust fan is arranged on the second support platform.

Technical Field

The invention relates to printing equipment, in particular to a hot air negative pressure circulating drying system.

Background

the gravure printing equipment (gravure) drying is a necessary printing function, a hot air medium dries a printing material, and moisture or a solvent in the printing ink is evaporated and discharged by hot air in an oven so as to achieve the aim of drying. The heat source is generally heated by natural gas or electric energy.

Oven rear end is generally arranged in to current drying system's updraft mechanism, utilize updraft mechanism's convulsions effect to realize in the hot-blast suction oven with hot-blast suction, the hot-blast lug connection of part retrieval and utilization realizes secondary cyclic utilization in the hot-blast room, like application number "2013200880731" high-efficient energy-concerving and environment-protective drying system of printing machine, including the oven, hot-blast air inlet mechanism and the updraft mechanism with the oven intercommunication, and be located oven upper box and oven lower box on the oven, updraft mechanism includes the main convulsions takeover that is linked together with the oven, the main exhaust column that is linked together with outside air purification device, the hot-blast main exhaust column of taking out from the oven through convulsions takeover, convulsions takeover and control convulsions the convulsions variable frequency fan of convulsions. The design of this structure can satisfy the use when heating temperature is high, but the different position temperature in the oven is different under the medium and low temperature requirement, and there is the temperature control unstability moreover, and the big drawback of left and right temperature deviation causes the waste of equipment in printing process time, material, ink, energy.

also there is some drying system to set up air supply fan at the front end of oven, utilize air supply fan to send hot-blast into in the oven, like application number "2017107514052" a printing machine central heating device, including fixed connection's hot-blast furnace body in proper order, the connecting air pipe, air supply fan, the heat supply pipeline, still include a plurality of printing machine colour groups, every printing machine colour group all includes a printing machine drying oven, printing machine drying oven is connected with the oven forced draught blower, oven forced draught blower and heat supply pipeline intercommunication, temperature control air valve is all installed with the heat supply pipeline junction to every oven forced draught blower, be provided with temperature sensor on the heat supply pipeline. The design of this structure can be solved and have the unstable problem of hot-blast temperature among the prior art, but hot-blast recycle that can not in the oven, and dry material with the same quantity needs more energy resource consumption, and the energy waste volume is big.

Therefore, the temperature uniformity in the drying oven of the drying system is improved, the temperature deviation is reduced, and the reduction of production waste and energy consumption is the problem which needs to be solved urgently at the present stage.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a hot air negative pressure circulation drying system, which changes a hot air circulation path in a drying process, improves the hot air distribution uniformity in a pipeline and an oven through a negative pressure mode, reduces temperature deviation, improves the hot air recycling and reduces energy consumption.

In order to achieve the aim, the invention provides a hot air negative pressure circulation drying system, which comprises a bracket, the drying system is fixed on the bracket and comprises a combustion chamber, an air inlet pipe, an oven, a return air pipe and a centrifugal air inlet machine, the combustion chamber, the centrifugal air inlet machine, the air inlet pipe, the oven and the return air pipe can form a sealed circulation system, an air inlet is connected to the air inlet end of the combustion chamber and used for receiving cold air, the cold air is heated in the combustion chamber to generate initial hot air, the air inlet end II of the combustion chamber is connected with an air return pipe for recovering hot air, the air outlet end of the combustion chamber is connected with a centrifugal air inlet machine to generate negative pressure, the air outlet end of the centrifugal air inlet machine is connected with the air inlet end of the oven through an air inlet pipe and is used for feeding hot air with uniform temperature distribution, and the air outlet end of the oven is connected with the combustion chamber through an air return pipe and is used for recovering the hot air.

The innovation point of the invention is mainly represented by the following aspects:

different from the traditional method that the air draft mechanism is arranged at the rear end of the combustion chamber to blow hot air into the drying oven, the negative pressure principle is creatively applied to the drying system, the centrifugal air inlet machine is arranged between the combustion chamber and the drying oven, air draft is realized through rotation of the impeller, micro negative pressure circulation is generated in the combustion chamber, initial hot air in the combustion chamber is sucked, recovered hot air enters the combustion chamber through circulation flow, secondary circulation of the hot air and cold air proportioning temperature are facilitated, overflow is reduced, the circulation speed is accelerated, and energy consumption is reduced; the centrifugal air inlet machine can also carry out primary active stirring to the recovered hot air and the initial hot air so that the hot air is uniformly mixed and then is sent into the oven, the temperature uniformity of the hot air is improved, and the printing and drying effect of the oven is good.

Preferably, an air homogenizing frame is arranged in the air inlet pipe, and a rotatable air homogenizing disc is arranged on the air homogenizing frame. Through setting up centrifugal air inlet machine between combustion chamber and oven, make this drying system in produce the negative pressure, hot-blast constantly circulates under the influence of negative pressure, in order to further strengthen the negative pressure effect in the drying system, strengthen the homogeneity of hot-blast mixture, even wind dish has been set up in the air-supply line, it is passive rotation to drive even wind dish behind the even wind dish that hot-blast entering, the front end of even wind dish rotates the rear end that induced drafts and rotates the air supply and produce the negative pressure in the air-supply line, the combined action of twice negative pressure, make hot-blast more stable at drying system inner loop, even wind dish absorbs the hot-blast back of centrifugal suction fan and carries out the secondary stirring simultaneously, make the temperature of hot-blast entering oven more even, the oven thermal efficiency is higher.

Preferably, a pipe joint is connected between the centrifugal air inlet fan and the air inlet pipe, and the pipe joint is a trapezoidal pipe joint. After the centrifugal air inlet machine rotates at a high speed and the impeller sucks air in the combustion chamber to perform primary active stirring, the air is decelerated and the flow direction is changed to enter the pipe joint, so that the time of hot air entering the oven can be shortened, when the pipe joint is set to be trapezoidal with a small left and a large right, the area of the air outlet is increased, and the hot air can enter the guide pipe quickly.

Preferably, a pipe joint is connected between the centrifugal air inlet machine and the air inlet pipe, an air volume adjusting pipe is arranged in the pipe joint, the air volume adjusting pipe comprises an air inlet, an air outlet I and an air outlet II, the air inlet is connected with the air outlet end of the centrifugal air inlet machine, the air outlet I is connected with the air inlet end of the air inlet pipe, the air outlet II is communicated with the outside, and an adjusting valve is arranged on the air outlet II. The traditional method mainly realizes the accurate adjustment of the temperature in the drying oven by adjusting the air speed or the air volume entering the drying oven once, but because the total amount of hot air in the drying system is constant, the temperature adjusting effect is poor, the drying system adjusts the air volume entering the drying oven by arranging the air volume adjusting pipe and controlling the on-off of the adjusting valve so as to adjust the temperature in the drying oven, and the temperature adjusting effect is good and the accuracy is high.

Preferably, the air inlet pipe is a Y-shaped air inlet pipe, a hose connector is arranged at the air outlet end of the air inlet pipe, an inclined connector is arranged at the rear end of the hose connector, and the inclined connector is connected with the air inlet end of the oven. The hose connector is arranged to facilitate connection of the recovery pipe and the inclined connector, the arrangement of the inclined connector increases the wind area and has guidance of air supply, and air supply is more rapid and convenient.

Preferably, one side of the air outlet end of the air return pipe is connected with the combustion chamber for returning air, the other side of the air outlet end of the air return pipe is connected with an exhaust pipe for exhausting air, an electric adjusting valve is arranged on the exhaust pipe, and an air exhaust fan is arranged at the air outlet end of the exhaust pipe. Through setting up electrical control valve, can adjust the hot-blast amount of wind of retrieving in the drying system to this temperature in adjusting the oven.

Preferably, the upper end of the support is provided with a first support platform, the combustion chamber is arranged on the first support platform, a second support platform is arranged below the first support platform, and the exhaust fan is arranged on the second support platform. Through arranging the combustion chamber in the top staff and be difficult for touchhing, security when improving the burning, the below is arranged in to the exhaust fan, does benefit to the staff to the operation of exhaust fan, and the overall arrangement sets up rationally.

The invention has the beneficial effects that:

1. The centrifugal air inlet machine is arranged between the combustion chamber and the drying oven, primary active air uniformization of an initial heat source and a recovered heat source in the combustion chamber is realized, the air uniformization effect is good, the temperature distribution in the drying oven is uniform, the drying effect is good, the drying time is shortened, and meanwhile, the negative pressure generated by air suction of the centrifugal air inlet machine is beneficial to secondary circulation of hot air in the combustion chamber and the cold air proportioning temperature;

2. Through the mutual matching action of the air homogenizing disc and the centrifugal air inlet machine, secondary passive air homogenizing is carried out under the action of primary active air homogenizing, the air homogenizing effect is further improved, the temperature distribution in the oven is uniform, and the thermal efficiency of the oven is high;

3. Through setting up air regulation pipe to this temperature in adjusting the oven, temperature regulation is effectual, reduces the temperature deviation, and the accuracy is high.

Drawings

FIG. 1 is a front view of an embodiment of the present invention.

Fig. 2 is a top view of an embodiment of the present invention.

Fig. 3 is a schematic structural view of the wind equalizing disc.

Fig. 4 is a schematic view of the structure of the air quantity adjusting duct.

In the figure: 1-bracket, 2-combustion chamber, 3-centrifugal air inlet machine, 4-air inlet pipe, 5-oven, 6-return air pipe, 7-pipe joint, 8-air equalizing frame, 9-air volume adjusting joint, 10-hose joint, 11-inclined joint, 12-supporting platform I, 13-supporting platform II, 21-air inlet pipe, 22-burner, 61-exhaust pipe, 71-air volume adjusting pipe, 81-air equalizing disc, 611-adjusting valve, 612-air exhaust fan, 711-air inlet, 712-air outlet I, 713-air outlet II and 714-adjusting valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

As shown in fig. 1 to 4, the present invention relates to a hot air negative pressure circulation drying system, which comprises a support 1, the drying system is fixed on the support 1, the drying system comprises a combustion chamber 2, a centrifugal air inlet machine 3, an air inlet pipe 4, an oven 5 and a return air pipe 6, the combustion chamber 2, the centrifugal air inlet machine 3, the air inlet pipe 4, the oven 5 and the return air pipe 6 form a closed system, an air inlet end of the combustion chamber 2 is connected with an air inlet 21 for receiving a cold air source, a left end of the combustion chamber 2 is connected with a burner 22, the cold air source heats natural gas combustion by the burner 22 and then adds initial hot air to the cold air source, an air return pipe 6 is connected with an air inlet end of the combustion chamber 2 for recovering hot air, an air outlet end of the combustion chamber 2 is connected with the centrifugal air inlet machine 3 for generating negative pressure for absorbing the initial hot air and actively equalizing the recovered hot air, an air outlet end of the centrifugal air inlet machine, used for sending the mixed hot air into an air inlet pipe 4, the air inlet pipe 4 is arranged in a Y shape,

Even wind frame 8 of air-supply line 4 internal fixation sets up even wind dish 81 through the pivot in the middle of even wind frame 8, and it drives even wind dish 81 rotation to produce certain velocity of flow after hot-blast entering air-supply line 4, carries out the even wind of secondary, twice even wind effect, and hot-blast temperature is heated evenly in getting into oven 5 postbaking box 5 and is effectively dried to the printing material, and drying uniformity is effectual, and drying efficiency is high, and hot-blast entering return air pipe 6 after the drying, air-out end one side and the combustion chamber 2 of return air pipe 6 are connected and are used for the return air, and the opposite side is connected with the air inlet end of exhaust pipe 61 and is used for airing exhaust, be equipped with electrical control valve 611 on the exhaust pipe 61, the air-out end of exhaust pipe 61 is equipped with.

Because the air draft effect of the centrifugal air inlet machine 3 generates negative pressure, internal circulation is formed in the whole drying system, and the air homogenizing effect of hot air is good.

more specifically, an air volume adjusting pipe 71 is arranged in the pipe joint 7, the air volume adjusting pipe 71 includes an air inlet 711, an air outlet 712 and an air outlet 713, the air inlet 711 is connected with an air outlet end of the centrifugal air inlet machine 3, the air outlet 712 is connected with an air inlet end of the air inlet pipe 4, the air outlet 713 is communicated with the outside, the air outlet 713 is provided with an adjusting valve 714, the air volume adjusting pipe 71 is adjusted according to the temperature in the oven 5, if the temperature in the oven 5 is higher, the adjusting valve 714 is opened, a part of the hot air mixed by the centrifugal air inlet machine 3 is discharged to the outside, if the temperature in the oven 5 is lower, the adjusting valve 714 is closed, all the hot air mixed by the centrifugal air inlet machine 3 enters the oven 5, and the temperature in the oven 5 is accurately adjusted;

More specifically, the air outlet end of the air inlet pipe 4 is further provided with a hose connector 10, the rear end of the hose connector 10 is provided with an inclined connector 11, so that the air inlet pipe 4 and the oven 5 can be conveniently connected, the air receiving area is increased, the air supply guidance performance is realized, and the air supply is more rapid and convenient.

more specifically, the upper end of support 1 is equipped with a supporting bench 12, on a supporting bench 12 was arranged in to combustion chamber 2, the below of supporting bench 12 is equipped with a supporting bench 13 two, on a supporting bench 13 was arranged in to air exhaust fan 95, such setting up staff is difficult for touchhing combustion chamber 2 on the one hand, security when improving the burning, and on the other hand is easy to control exhaust fan, and the overall arrangement sets up rationally.

The working process of the invention is as follows:

The burner 22 is turned on, the natural gas combustion chamber is automatically ignited, cold air entering from the air inlet 21 is combusted into initial hot air, meanwhile, the recovered hot air in the return air duct 6 enters the combustion chamber 2, the centrifugal air inlet machine 3 generates negative pressure when working, the initial hot air and the recovered hot air are sucked into the centrifugal air inlet machine 3, the impeller of the centrifugal air inlet machine 3 rotates to increase the first-stage active stirring to deeply and uniformly mix the initial hot air and the recovered hot air, the uniformly mixed hot air enters the air inlet pipe 4 through the pipe joint 7 to drive the air homogenizing disc 81 to rotate, the rotating air homogenizing disc 81 actively stirs the hot air for the second time and then sends the hot air into the oven 5, the materials in the oven 5 are dried, the air outlet end of the oven 5 discharges the recovered hot air, the recovered hot air enters the combustion chamber 2 through the return air pipe 6 to form a circulating system, at the same time, the regulating valve 714 of the pipe joint 7 is controlled to open and close to accurately regulate the temperature in the oven 5.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.