Digital printing drying equipment

Abstract

The utility model provides digital printing drying equipment which comprises a machine box, an air inlet, an air supply outlet, an air return opening and an air exhaust opening, the air inlet, the air supply outlet, the air return opening and the air exhaust opening are formed in the machine box, a fresh air channel is formed in the machine box and located between the air inlet and the air supply outlet, and an air return channel is formed in the machine box and located between the air return opening and the air exhaust opening; the fresh air channel is sequentially provided with an evaporator, a reheating condenser and a heater in the direction from the air inlet to the air supply outlet, the evaporator is used for condensing and dehumidifying gas, the reheating condenser and the heater are both used for heating the gas, a connecting pipe communicating the air return channel with the fresh air channel is arranged between the air return channel and the fresh air channel, and an air valve is arranged on the connecting pipe. The evaporator is arranged to cool and dehumidify fresh air or mixed air, the drying humidity requirement of printing products can be met, heat recycling can be achieved through the reheating condenser, heat in return air can be further recycled by connecting the fresh air channel with the return air channel, and therefore energy consumption is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of printing and drying, and in particular to a digital printing and drying device. Background Art

[0002] Digital printing is a new type of digital printing technology. It processes images or graphics through computer software and prints them on paper or plastic film. It has become a new type of printing technology. In digital printing, drying is one of the indispensable steps in making digital printing products. Digital printing drying is the process of solidifying printing ink on the printed matter at a certain temperature and time to prevent ink loss or distortion, enhance color brightness, and prolong quality. The drying temperature of digital printing needs to be adjusted according to different materials and printing inks.

[0003] Generally speaking, the drying temperature of digital printing is between 30℃-80℃. In terms of heating equipment, digital printing equipment generally uses electric thermostats, which can automatically adjust the drying temperature, but the energy consumption is very large, and there is no dehumidification function, no energy recovery, high exhaust temperature, which does not comply with the national carbon emission policy, and the exhaust cannot be controlled. Utility Model Content

[0004] The purpose of this application is to provide a digital printing drying device that reduces the humidity in the wind through condensation dehumidification, and can realize heat recovery and reuse to achieve the purpose of energy saving and emission reduction.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A digital printing drying device, comprising a chassis and an air inlet, an air supply outlet, an air return outlet and an air exhaust outlet arranged on the chassis, a fresh air passage is arranged between the air inlet and the air supply outlet in the chassis, and a return air passage is arranged between the return air outlet and the air exhaust outlet in the chassis;

[0007] The fresh air channel is provided with an evaporator, a reheat condenser and a heater in sequence along the direction from the air inlet to the air supply outlet. The evaporator is used to condense and dehumidify the gas. The reheat condenser and the heater are both used to heat the gas. A connecting pipe is provided between the return air channel and the fresh air channel to connect the two, and an air valve is provided on the connecting pipe.

[0008] Further arrangement: the connecting pipe includes a first connecting pipe connected between the return air channel and the fresh air outlet of the fresh air channel and the evaporator, and the first connecting pipe is provided with a first air valve, and the first air valve opens when the supply air humidity is higher than the target supply air humidity and the return air temperature is greater than the first set temperature.

[0009] Further arrangement: the connecting pipe includes a second connecting pipe connected between the evaporator and the reheat condenser of the return air channel and the fresh air channel, and a second air valve is provided on the second connecting pipe. The second air valve opens when the supply air humidity is lower than the target supply air humidity and the return air temperature is lower than the first set temperature.

[0010] Further arrangement: the connecting pipe includes a third connecting pipe connected between the reheat condenser and the heater of the return air channel and the fresh air channel, and the third connecting pipe is provided with a third air valve, and the third air valve opens when the supply air humidity is lower than the target supply air humidity and the fresh air temperature is lower than the second set temperature.

[0011] It is further arranged that the third connecting pipe, the second connecting pipe and the first connecting pipe on the return air channel are arranged in sequence from the direction from the return air port to the exhaust port.

[0012] Further configuration: also includes a compressor connected to the evaporator, the compressor is used to compress the refrigerant after absorbing heat through the evaporator into a high-temperature and high-pressure gas state, the output end of the compressor is connected to a first circulation channel, a first solenoid valve is provided on the first circulation channel, and the refrigerant in the first circulation channel circulates through the evaporator, the compressor and the reheat condenser in sequence.

[0013] It is further configured that the output end of the compressor is also connected to a second circulation channel, a second solenoid valve and a heat dissipation condenser are provided on the second circulation channel, the heat dissipation condenser is connected to the return air channel, and the heat dissipation condenser is used to heat the exhaust air.

[0014] Further configuration: the evaporator includes a main evaporator and an auxiliary evaporator connected in parallel to the main evaporator, the input end of the main evaporator and the input end of the auxiliary evaporator are interconnected and both are arranged close to the air inlet, the output end of the main evaporator and the output end of the auxiliary evaporator are interconnected and both are arranged close to the reheat condenser.

[0015] It is further configured that the air supply port is used to be connected to the air inlet of the oven of the digital printing machine, and an air supply fan is provided at the air supply port.

[0016] It is further configured that a drain pipe connected to the evaporator for draining condensed water is provided at the bottom of the chassis.

[0017] Compared with the prior art, the solution of this application has the following advantages:

[0018] 1. In the digital printing drying equipment involved in the present application, an evaporator is set to cool and dehumidify the fresh air or mixed air before heating, so as to meet the drying humidity requirements of the printed products. At the same time, the heat recovered from the evaporator is used by the reheat condenser to heat the fresh air or mixed air after the dehumidification treatment, so as to realize heat recovery and reuse, reduce heat loss, and also reduce the energy consumption of subsequent heating and heating by the heater. The fresh air or mixed air is then heated to the target supply air temperature by the heater, so that the humidity of the supply air can be accurately controlled according to the requirements of printing drying, and the heat of the dehumidification process is recovered and reused by the refrigerant, so as to reduce heat loss, and the circulating air and exhaust air volume can be adjusted at different humidity and temperature, with a high degree of intelligence and energy saving and environmental protection.

[0019] 2. In the digital printing drying equipment involved in the present application, by connecting the fresh air duct with the return air duct, the heat in the return air can be further recycled, thereby reducing energy consumption.

[0020] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 This is a structural schematic diagram of an embodiment of the digital printing drying equipment of the present application;

[0023] Figure 2 This is a schematic diagram of the gas flow of the digital printing drying equipment of this application.

[0024] In the figure, 1, chassis; 11, air inlet; 12, air supply outlet; 121, air supply fan; 13, return air outlet; 14, exhaust outlet; 15, drain pipe; 16, corner seat; 2, evaporator; 21, main evaporator; 22, auxiliary evaporator; 3, reheat condenser; 4, heater; 5, heat dissipation condenser; 6, compressor; 100, fresh air channel; 200, return air channel; 300, first connecting pipe; 301, first air valve; 400, second connecting pipe; 401, second air valve; 500, third connecting pipe; 501, third air valve; 600, first circulation channel; 601, first solenoid valve; 700, second circulation channel; 701, second solenoid valve. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0026] Those skilled in the art will appreciate that, unless specifically stated, the "said" and "the" used herein may also include plural forms. It should be further understood that the term "including" used in the specification of the present application refers to the presence of the features, parts and / or components, but does not exclude the implementation of other features, parts, components and / or their combinations supported by the technical field. The term "and / or" used herein refers to at least one of the items defined by the term, for example, "A and / or B" can be implemented as "A", or as "B", or as "A and B".

[0027] In the description of the present application, the directions or positional relationships indicated by words such as "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the exemplary directions or positional relationships shown in the accompanying drawings. They are for the convenience of describing or simplifying the description of the embodiments of the present application, and do not indicate or imply that the referred device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0029] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0031] In view of the problem that the current digital printing machine only uses electric thermostat for drying, which leads to high energy consumption, poor dehumidification and uncontrollable exhaust quality, this application provides a digital printing drying device, see Figure 1 and Figure 2 It includes a chassis 1 and an air inlet 11, an air supply port 12, an air return port 13 and an air exhaust port 14 arranged on the chassis 1, wherein the air inlet 11 is used to input fresh air, the air supply port 12 is fitted or softly connected to the air inlet 11 of the digital printing machine oven, and an air supply fan 121 is provided at the air supply port 12 to send hot air into the oven of the digital printing machine to dry the printed products, the return air port 13 is fitted or softly connected to the oven outlet of the digital printing machine, and the air exhaust port 14 is used to discharge the processed exhaust air to the outside of the chassis 1. The digital printing drying equipment of the present application is provided with a fresh air duct 100 between the air inlet 11 and the air supply outlet 12, and a return air duct 200 is provided between the return air outlet 13 and the exhaust outlet 14. The fresh air duct 100 and the return air duct 200 can accurately control the supply air humidity, temperature and overall exhaust air volume according to the requirements of the printed products, and can adjust the air supply and exhaust at different humidity and temperature. It has a high degree of intelligence and reduces heat loss to achieve the purpose of energy saving and environmental protection.

[0032] Specifically, the fresh air passage 100 of the present application is provided with an evaporator 2, a reheat condenser 3 and a heater 4 in sequence along the direction from the air inlet 11 to the air supply port 12. The fresh air enters the fresh air passage 100 from the air inlet 11, and first passes through the evaporator 2 for condensation and dehumidification. The evaporator 2 cools the fresh air to condense the water vapor to form condensed water, and achieves the purpose of dehumidifying the fresh air by gas-liquid separation. At the same time, the condensed water can be discharged to the outside of the chassis 1 through the drain pipe 15 provided at the bottom of the chassis 1. Moreover, the refrigerant located in the evaporator 2 absorbs the heat in the fresh air to condense and dehumidify it. The refrigerant that absorbs the heat can then heat the fresh air after condensation and dehumidification through the reheat condenser 3, so as to achieve the effect of heating and drying the fresh air. The reuse of the heat recovered by the refrigerant can improve the utilization efficiency of the heat. Finally, the heater 4 continues to heat the fresh air to make the temperature reach the target air supply temperature, and the hot air is sent into the oven of the digital printing machine through the air inlet 11.

[0033] The air outlet of the oven of the digital printing machine enters the return air channel 200 through the return air port 13 , and then is discharged to the outside of the chassis 1 through the return air channel 200 .

[0034] Furthermore, in order to reduce the loss of exhaust air heat, the present application sets a connecting pipe between the return air duct 200 and the fresh air duct 100, and a valve is set on the connecting pipe. The return air is sent into the fresh air duct 100 to mix with the fresh air, so as to recover the heat in the return air while ensuring the supply air temperature and humidity, reduce the emission loss of heat, and achieve the purpose of energy saving and emission reduction.

[0035] In this embodiment, the connecting pipe includes a first connecting pipe 300 connected between the fresh air inlet of the return air channel 200 and the fresh air channel 100 and the evaporator 2. A first air valve 301 is provided on the first connecting pipe 300. The first air valve 301 will automatically open when the return air humidity is higher than the target supply air humidity and the return air temperature is greater than the first set temperature. The return air enters the fresh air channel 100 and mixes with the fresh air to obtain mixed air. The first set temperature in this embodiment is 55°C. The humidity of the mixed air is greater than the target supply air humidity. After entering the evaporator 2, the refrigerant absorbs heat to condense and dehumidify the mixed air, so that the humidity of the mixed air reaches the target supply air humidity. At the same time, the refrigerant in the evaporator 2 will absorb a large amount of heat.

[0036] Further, the connecting pipe includes a second connecting pipe 400 connected between the return air channel 200 and the evaporator 2 and the reheat condenser 3 of the fresh air channel 100. The second connecting pipe 400 is also provided with a second air valve 401. The second air valve 401 will automatically open when the supply air humidity is lower than the target supply air humidity and the return air temperature is lower than the first set temperature, so that the return air passes through the second connecting pipe 400 into the fresh air channel 100 and is further mixed with the fresh air or the mixed air. The first set temperature in this embodiment is set to 55°C. Since the humidity and temperature of the return air are both low, there is no need to further condense and dehumidify the return air or the mixed air through the evaporator 2.

[0037] In addition, the connecting pipe also includes a third connecting pipe 500 connected between the reheat condenser 3 and the heater 4 of the return air channel 200 and the fresh air channel 100. The third connecting pipe 500 is provided with a third air valve 501. The third air valve 501 will automatically open when the supply air humidity is lower than the target supply air humidity and the fresh air temperature is lower than the second set temperature, so that the return air can be passed into the fresh air channel 100 through the third connecting pipe 500 to further mix with the fresh air or mixed air. The second set temperature of this embodiment is 10°C. The fresh air is first mixed with the return air to increase the temperature, which can reduce the power required for heating the mixed air that subsequently enters the heater 4.

[0038] The third connecting pipe 500, the second connecting pipe 400 and the first connecting pipe 300 on the return air channel 200 of this embodiment are arranged in sequence from the return air port 13 to the exhaust port 14, and the valve opening order of the first connecting pipe 300, the second connecting pipe 400 and the third connecting pipe 500 in this embodiment is 20%, 30%, 70%, 100%, so that the opening of the valve on the connecting pipe can be controlled according to the air duct flow rate to maximize the recovery of the heat of the return air. That is, in the case where the temperature and humidity of the return air are too high, the first air valve 301 before the evaporator 2 is opened to allow the return air to return to the air inlet 11 and mix with the fresh air, and then pass through the evaporator 2 to cool and dehumidify, so as to recover the heat of the return air as much as possible while ensuring the temperature and humidity of the supply air; and in the case where the return air temperature is too high or high and the humidity is low, the second air valve 401 or the third air valve 501 after the evaporator 2 is opened, so that the return air is directly mixed with the dehumidified fresh air, and the mixed air temperature is increased to save the energy consumption of the subsequent heating of the fresh air. The coordinated operation of the three air valves can prevent return air with lower temperature and higher humidity from entering the fresh air duct 100. The return air with lower temperature and higher humidity is discharged by increasing the exhaust rate to avoid the return air and fresh air mixing to increase the humidity of the fresh air and thus increase energy consumption due to the increased humidity.

[0039] Furthermore, the evaporator 2 of the present application includes a main evaporator 21 and an auxiliary evaporator 22 connected in parallel to the main evaporator 21. The input end of the main evaporator 21 and the input end of the auxiliary evaporator 22 are interconnected and both are arranged close to the air inlet 11. The output end of the main evaporator 21 and the output end of the auxiliary evaporator 22 are interconnected and both are arranged close to the reheat condenser 3. The main evaporator 21 and the auxiliary evaporator 22 work simultaneously. When the operating temperature of the main evaporator 21 is too high or too low, most of the heat in the fresh air or mixed air can be absorbed by the auxiliary evaporator 22, so that the water vapor can be smoothly condensed into condensed water and discharged, thereby ensuring the dehumidification effect of the fresh air or mixed air.

[0040] The digital printing drying equipment of the present application also includes a compressor 6 connected to the evaporator 2. The compressor 6 can compress the refrigerant absorbing heat in the evaporator 2 into a high-temperature and high-pressure gas state and transfer it to the condenser to heat and increase the temperature of the gas, so as to realize heat recovery and reuse. The output end of the compressor 6 is connected to two refrigerant circulation channels, which are the first circulation channel 600 and the second circulation channel 700. The refrigerant in the first circulation channel 600 circulates through the evaporator 2, the compressor 6 and the reheat condenser 3 in sequence, and a first solenoid valve 601 is provided on the first circulation channel 600. After the refrigerant absorbs heat at the evaporator 2, it enters the compressor 6, and the refrigerant is further compressed into a high-temperature and high-pressure gas state by the compressor 6. The first solenoid valve 601 is opened, so that the refrigerant in the gas state enters the reheat condenser 3 through the first circulation channel 600 to heat and dry the fresh air or mixed air after dehumidification by the evaporator 2. After releasing heat, the refrigerant returns to the evaporator 2 to wait for the next heat absorption and heat release cycle. Similarly, the second circulation channel 700 is provided with a second solenoid valve 701 and a heat dissipation condenser 5, and the refrigerant in the second circulation channel 700 passes through the evaporator 2, the compressor 6 and the heat dissipation condenser 5 in sequence. When the return air temperature is low, the air valves on the connecting pipe are all in a closed state, and the return air passes through the heat dissipation condenser 5 before being discharged. The second solenoid valve 701 is opened, so that the refrigerant compressed into a high-temperature and high-pressure gas state by the compressor 6 enters the heat dissipation condenser 5 to heat the discharged return air, ensure the heat dissipation stability of the compressor 6, and play a protective role to avoid the heating temperature of the reheat condenser 3 being too high under special working conditions. The refrigerant after heat release returns to the evaporator 2 to wait for the next round of heat absorption and heat release cycle.

[0041] The first circulation channel 600 and the second circulation channel 700 can realize the cycle of heat absorption and heat release of the refrigerant, so as to fully utilize the heat recovered by the evaporator 2 for cooling and reduce heat loss, and also reduce the energy consumption of the heater 4 for heating the fresh air or mixed air.

[0042] In addition, the bottom of the chassis 1 is provided with a drain pipe 15 connected to the evaporator 2, through which the condensed water can be promptly discharged to the outside of the chassis 1, so as to avoid the condensed water accumulating in the chassis 1 and affecting the dehumidification effect of the fresh air or the mixed air. The bottom of the chassis 1 is also provided with corner seats 16 respectively located at the four corner ends, through which the bottom of the chassis 1 is kept away from the ground, so as to avoid the working environment temperature rising due to the lack of air circulation at the bottom of the chassis 1, and ensure the normal operation of the digital printing drying equipment of the present application.

[0043] In summary, the digital printing drying equipment of the present application can meet the drying humidity requirements for printed products by setting an evaporator 2 to cool and dehumidify the fresh air or mixed air before heating. At the same time, the heat recovered from the evaporator 2 is used by the reheat condenser 3 to heat the fresh air or mixed air after dehumidification, so as to achieve heat recovery and reuse, reduce heat loss, and also reduce the energy consumption of subsequent heating and heating by the heater 4, and then heat the fresh air or mixed air to the target air supply temperature by the heater 4. The present application can accurately control the humidity of the air supply according to the requirements of printing drying, and the heat of the dehumidification process is recovered and reused through the refrigerant to reduce heat loss, and can adjust the circulating air and exhaust air volume at different humidity and temperature, with a high degree of intelligence, energy saving and environmental protection.

[0044] In addition, the digital printing drying equipment of the present application connects the fresh air duct 100 with the return air duct 200, which can further recycle the heat in the return air, thereby reducing energy consumption.

[0045] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A digital printing drying equipment, characterized in that: The invention comprises a chassis (1) and an air inlet (11), an air supply outlet (12), an air return outlet (13) and an air exhaust outlet (14) arranged on the chassis (1); a fresh air passage (100) is arranged between the air inlet (11) and the air supply outlet (12) in the chassis (1); and a return air passage (200) is arranged between the return air outlet (13) and the air exhaust outlet (14) in the chassis (1); The fresh air channel (100) is provided with an evaporator (2), a reheat condenser (3) and a heater (4) in sequence along the direction from the air inlet (11) to the air outlet (12); the evaporator (2) is used for condensing and dehumidifying the gas; the reheat condenser (3) and the heater (4) are both used for heating the gas; a connecting pipe is provided between the return air channel (200) and the fresh air channel (100) to connect the two; and a wind valve is provided on the connecting pipe.

2. The digital printing drying equipment according to claim 1, characterized in that: The connecting pipe comprises a first connecting pipe (300) connected between the return air channel (200) and the fresh air outlet of the fresh air channel (100) and the evaporator (2); a first air valve (301) is provided on the first connecting pipe (300); the first air valve (301) is opened when the supply air humidity is higher than the target supply air humidity and the return air temperature is higher than a first set temperature.

3. The digital printing drying equipment according to claim 2, characterized in that: The connecting pipe comprises a second connecting pipe (400) connected between the evaporator (2) and the reheat condenser (3) of the return air channel (200) and the fresh air channel (100); a second air valve (401) is provided on the second connecting pipe (400); the second air valve (401) is opened when the supply air humidity is lower than the target supply air humidity and the return air temperature is lower than the first set temperature.

4. The digital printing drying equipment according to claim 3, characterized in that: The connecting pipe also includes a third connecting pipe (500) connected between the reheat condenser (3) and the heater (4) of the return air channel (200) and the fresh air channel (100), and a third air valve (501) is provided on the third connecting pipe (500). The third air valve (501) is opened when the supply air humidity is lower than the target supply air humidity and the fresh air temperature is lower than the second set temperature.

5. The digital printing drying equipment according to claim 4, characterized in that: The third connecting pipe (500), the second connecting pipe (400), and the first connecting pipe (300) on the return air channel (200) are arranged in sequence in the direction from the return air port (13) to the exhaust air port (14).

6. The digital printing drying equipment according to claim 1, characterized in that: The invention also includes a compressor (6) connected to the evaporator (2), wherein the compressor (6) is used to compress the refrigerant after absorbing heat from the evaporator (2) into a high-temperature and high-pressure gas state, and the output end of the compressor (6) is connected to a first circulation channel (600), and a first solenoid valve (601) is provided on the first circulation channel (600). The refrigerant in the first circulation channel (600) circulates through the evaporator (2), the compressor (6) and the reheat condenser (3) in sequence.

7. The digital printing drying equipment according to claim 6, characterized in that: The output end of the compressor (6) is also connected to a second circulation channel (700), and the second circulation channel (700) is provided with a second solenoid valve (701) and a heat dissipation condenser (5). The heat dissipation condenser (5) is connected to the return air channel (200), and the heat dissipation condenser (5) is used to heat the exhaust air.

8. The digital printing drying equipment according to claim 1, characterized in that: The evaporator (2) comprises a main evaporator (21) and an auxiliary evaporator (22) connected in parallel to the main evaporator (21); an input end of the main evaporator (21) and an input end of the auxiliary evaporator (22) are interconnected and both are arranged close to an air inlet (11); an output end of the main evaporator (21) and an output end of the auxiliary evaporator (22) are interconnected and both are arranged close to a reheat condenser (3).

9. The digital printing drying equipment according to claim 1, characterized in that: The air supply port (12) is used to be connected to the oven air inlet (11) of the digital printing machine, and an air supply fan (121) is provided at the air supply port (12).

10. The digital printing drying equipment according to claim 1, characterized in that: The bottom of the chassis (1) is provided with a drain pipe (15) for connecting to the evaporator (2) for draining condensed water.

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