Gravure system utilizing waste heat of air compressor

Abstract

The utility model relates to the technical field of gravure, in particular to a gravure system utilizing waste heat of an air compressor. The device comprises an air compressor; the air conditioner terminal is used for heating air; the heat exchanger is used for carrying out heat exchange on waste heat of the air compressor and a heating medium; the heat exchanger is communicated with the air conditioner tail end through a circulating pipeline, and the circulating pipeline comprises a discharge pipe used for feeding a heating medium into the air conditioner tail end from the heat exchanger and a discharge pipe used for feeding the heating medium back to the heat exchanger from the air conditioner tail end; a high-temperature heating medium box is arranged in the inlet pipe, a low-temperature heating medium box is arranged in the outlet pipe, and a liquid supplementing opening is formed in the low-temperature heating medium box. According to the air conditioner terminal, the high-temperature heating medium box is arranged, so that when the air conditioner terminal does not need to supply heat, the heating medium absorbing the waste heat of the air compressor can be stored in the high-temperature heating medium box so as to be used when the air conditioner terminal needs to supply heat, and loss of the waste heat of the air compressor is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gravure printing, in particular to a gravure printing system that utilizes the waste heat of an air compressor. Background Art

[0002] Gravure printing is a printing method in which the ink on the printing plate except for the graphic part is scraped clean, and then an appropriate pressure is applied between the printing plate and the printed material through a pressure printing rubber roller to squeeze the ink from the concave surface onto the printed material. This printing method makes the printed matter have the advantages of excellent gradation performance, corresponding to various substrates, seamless image printing, and good printing quality stability.

[0003] During the gravure printing process, the main equipment used includes plate-making machines, printing machines, air compressors, temperature and humidity control machines, etc. Among them, the air compressor mainly provides power for other pneumatic control components, and a large amount of waste heat is generated during the operation of the air compressor. The existing treatment method is to directly discharge this part of energy without utilization, resulting in waste of energy.

[0004] The patent document with the publication number CN206681949U discloses such an air compressor waste heat recovery device, which includes an air compressor cooling pipeline and an air-conditioning heating pipeline connected to the air compressor cooling pipeline through a main three-way valve, and also includes a bypass pipeline. One end of the bypass pipeline is connected to the air compressor cooling pipeline upstream of the main three-way valve, and the other end of the bypass pipeline is connected to the air compressor cooling pipeline downstream of the main three-way valve or the air-conditioning heating pipeline downstream of the main three-way valve. Bypass valves are provided on each bypass pipeline.

[0005] This prior art can utilize the waste heat of the air compressor on the air-conditioning heating pipeline. Specifically, the liquid medium that has absorbed the waste heat is controlled to enter the air-conditioning heating system or the cooling tower by means of switching valves. That is to say, when the air-conditioning heating system does not require heat, the liquid medium is directly sent back to the air compressor via the cooling tower to cool the air compressor. During this process, the waste heat is abandoned and lost at the cooling tower, and the waste heat of the air compressor is not fully utilized. Content of the Utility Model

[0006] The utility model aims to solve the above problems and provides a gravure printing system that can fully utilize the waste heat of the air compressor.

[0007] The technical solution for the present utility model to solve the problem is to provide a gravure printing system utilizing the waste heat of an air compressor, including a gravure printing device arranged in a workshop factory building, wherein the gravure printing device includes an air compressor; it further includes an air-conditioning unit for adjusting the temperature in the workshop factory building, and the air-conditioning unit includes an air-conditioning terminal for heating air; it also includes a heat exchanger for exchanging the waste heat of the air compressor with a heat medium; the heat exchanger is communicated with the air-conditioning terminal through a circulation pipeline, and the circulation pipeline includes a discharge pipe for sending the heat medium from the heat exchanger to the air-conditioning terminal and a discharge pipe for sending the heat medium from the air-conditioning terminal back to the heat exchanger; a high-temperature heat medium tank is arranged in the discharge pipe, and a low-temperature heat medium tank is arranged in the discharge pipe, and a liquid supplement port is provided on the low-temperature heat medium tank.

[0008] As a preference of the present utility model, the high-temperature heat medium tank is sequentially provided with a high-temperature overflow port, a high-temperature inlet, a high-temperature balance port, and a high-temperature outlet along the up-down direction; the low-temperature heat medium tank is sequentially provided with a low-temperature overflow port, a low-temperature inlet, a low-temperature balance port, and a low-temperature outlet along the up-down direction; the high-temperature balance port is communicated with the low-temperature balance port.

[0009] As a preference of the present utility model, the heat medium is water.

[0010] As a preference of the present utility model, the high-temperature heat medium tank is communicated with the low-temperature heat medium tank through a medium-temperature heat medium tank; the gravure printing system further includes a humidifying unit for adjusting the humidity in the workshop factory building, and the humidifying unit includes a humidifying water tank; the medium-temperature heat medium tank is communicated with the humidifying water tank.

[0011] As a preference of the present utility model, an RO filter is arranged between the medium-temperature heat medium tank and the humidifying water tank.

[0012] As a preference of the present utility model, the air-conditioning unit further includes an air outlet pipe for discharging the air in the workshop factory building, and a water curtain is arranged in the air outlet pipe; the water inlet of the water curtain is communicated with the high-temperature heat medium tank.

[0013] As a preference of the present utility model, the air outlet pipe includes a horizontally arranged air guiding part, and the water curtain is arranged in the air guiding part.

[0014] As a preference of the present utility model, the air outlet pipe further includes an air outlet part vertically connected to the air guiding part.

[0015] As a preference of the present utility model, the air outlet pipe includes an outer shell and an inner shell, and an air outlet channel for air outlet and provided with the water curtain is formed between the outer shell and the inner shell; the air-conditioning unit further includes an air inlet pipe for introducing fresh air, and the air inlet pipe is arranged in the air guiding part of the inner shell.

[0016] As a preference of the utility model, the gravure printing device further includes an oven for drying printed articles, and a humidifier is arranged in the oven; the nozzle of the air outlet pipe includes a drainage part for discharging water, and the drainage part is communicated with the humidifier.

[0017] Advantages of the utility model:

[0018] 1. In this application, by setting up a high-temperature heat medium tank, when heating is not required at the air-conditioning terminal, the heat medium that has absorbed the waste heat of the air compressor can be stored in the high-temperature heat medium tank for use when heating is required at the air-conditioning terminal, reducing the loss of waste heat of the air compressor. At this time, the cooling of the air compressor is provided by the heat medium in the low-temperature heat medium tank. This heat medium comes from the heat medium whose temperature has decreased after heat exchange at the air-conditioning terminal during heating at the air-conditioning terminal and the low-temperature heat medium supplemented by the liquid filling port, which can ensure continuous cooling of the air compressor.

[0019] In addition, when the air compressor stops and heating is required at the air-conditioning terminal, the high-temperature heat medium tank can stably supply heat medium to the air-conditioning terminal, ensuring the continuity and stability of heating at the air-conditioning terminal, that is, the entire circulation system is not affected by the on / off of a certain device and is more flexible. Moreover, the high-temperature heat medium tank is between the heat exchanger and the air-conditioning terminal and can act as a temperature buffer structure to adjust the heat medium with unstable temperature in the heat exchanger to a stable and consistent state before sending it to the air-conditioning terminal, ensuring the stability of heating at the air-conditioning terminal.

[0020] 2. In this application, the high-temperature heat medium tank and the low-temperature heat medium tank are communicated, and the position height of the balance port for communication is adjusted so that only when there is too much heat medium in the high-temperature heat medium tank, the excess heat medium will enter the low-temperature heat medium tank through the balance port, ensuring the stability of the circulation pipeline while minimizing waste heat loss.

[0021] 3. In some embodiments, water is used as the heat medium, and a medium-temperature heat medium tank communicated with the humidifying unit is added to provide humidity for the workshop with water at a certain temperature, so that while providing humidity, the temperature of the workshop can also be slightly increased, further making full use of the excess heat medium while reducing the energy consumption of the air-conditioning unit.

[0022] 4. In some embodiments, water is used as the heat medium, and the excess heat medium in the high-temperature heat medium tank is applied to the outlet duct of the air-conditioning unit. A small amount of volatile substances in the gas in the outlet duct are dissolved by the hot water, reducing the emission of odors (the volatile substances mainly come from gravure inks, which will volatilize into the air during the gravure process and are thus extracted and discharged by the air-conditioning unit. The volatile substances mainly contain ethanol, ethyl acetate, etc.; since the gravure equipment itself has an exhaust device, the amount of volatile substances that can volatilize into the air in the workshop is relatively small). On this basis, in some embodiments, the dissolved hot water is applied to the inlet duct of the air-conditioning unit to preheat the fresh air. While further utilizing the excess heat medium, the energy consumption of the air-conditioning unit is reduced. On this basis, in some embodiments, the dissolved hot water is applied to the oven of the gravure equipment to humidify the printed articles during the drying process and prevent the printed articles from curling, further utilizing the excess heat medium. Description of the Drawings

[0023] Figure 1 is a schematic diagram of Embodiment 1 of a gravure system using the waste heat of an air compressor;

[0024] Figure 2 is a schematic diagram of Embodiment 2 of a gravure system using the waste heat of an air compressor;

[0025] Figure 3 is a schematic diagram of the structure of the inlet duct and the outlet duct of the air-conditioning unit in Embodiment 2;

[0026] In the figure: air compressor 11; oven 12; air-conditioning terminal 21, inlet 211, outlet 212; air guiding part 221, air outlet part 222, outer shell 22a, inner shell 22b; inlet duct 23; heat exchanger 31; high-temperature heat medium tank 32, high-temperature overflow port 321, high-temperature inlet 322, high-temperature balance port 323, high-temperature outlet 324; low-temperature heat medium tank 33, low-temperature overflow port 331, low-temperature inlet 332, low-temperature balance port 333, low-temperature outlet 334, liquid supplement port 335; humidifying water tank 41, RO filter 411. Detailed Embodiments

[0027] The following are the detailed embodiments of the present invention. In combination with the drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0028] Embodiment 1

[0029] A gravure system using the waste heat of an air compressor, as Figure 1As shown, the gravure printing system first includes a gravure printing device installed in a workshop building. The gravure printing device includes an air compressor 11. The function of the air compressor 11 is to generate high-pressure gas to drive various devices in the gravure printing device. For example, in the paper feeding section, paper separating suction nozzles, paper transferring suction nozzles, paper separating air nozzles, etc. are used to separate and transfer the paper through blowing and suction. In the printing step, the clutch between the impression cylinder and the printing plate and the position of the printing plate cylinder are controlled by pneumatic technology. During the operation of the air compressor 11, heat is generated.

[0030] Secondly, the gravure printing system includes an air conditioning unit for regulating the temperature in the workshop building to ensure the normal operation of the gravure printing device. The air conditioning terminal 21 in the air conditioning unit is a device for exchanging heat between air and a refrigeration structure or a heating structure to send cold air or hot air into the room. Part of the heating structure is realized through a coil heat exchanger. By inputting hot heat medium into the coil heat exchanger to heat the air, and then discharging the cold heat medium after the heat exchange. Therefore, as Figure 1 shown, the air conditioning terminal 21 includes an inlet 211 and an outlet 212 for the inlet and outlet of the heat medium.

[0031] In order to utilize the waste heat of the air compressor 11 in the air conditioning terminal 21 in this application, a heat exchanger 31 is first provided. The heat exchanger 31 is used to exchange heat between the waste heat of the air compressor 11 and the heat medium. Among them, the working waste heat temperature of the air compressor 11 is not very high, so water can be used as the heat medium in the heat exchanger 31. Specifically: the oil pipeline of the air compressor 11 and the heat medium pipeline of the heat exchanger 31 are arranged alternately. When the hot oil in the air compressor 11 flows in the oil pipeline, it will transfer heat to the heat medium in the heat medium pipeline, which is water in this embodiment, so that the water is heated and the oil is cooled. When the cooled oil returns to the air compressor 11, it can cool the air compressor 11 to a certain extent. Secondly, the obtained hot water is sent to the air conditioning terminal 21. Specifically: the heat exchanger 31 and the air conditioning terminal 21 are connected through a circulation pipeline. The circulation pipeline includes a discharge pipe with one end connected to the outlet of the heat medium pipeline and the other end connected to the inlet 211 of the air conditioning terminal 21 for sending the heat medium from the heat exchanger 31 into the air conditioning terminal 21; and a discharge pipe with one end connected to the inlet of the heat medium pipeline and the other end connected to the outlet 212 of the air conditioning terminal 21 for sending the heat medium from the air conditioning terminal 21 back to the heat exchanger 31. After the hot water enters the air conditioning terminal 21, it can exchange heat with the air to heat the air, and the hot air sent into the workshop building by the air conditioning terminal 21 can increase the temperature in the workshop building.

[0032] Since the suitable ambient temperature for gravure printing is generally between 19°C and 25°C, it is not necessary to increase the temperature in the workshop at all times. When the air conditioner terminal 21 does not need to work while the air compressor 11 is still working and generating waste heat, in order to avoid the loss of waste heat generated by the air compressor 11 at this time, in this application, first, a high-temperature heat medium tank 32 is provided on the discharge pipe. The high-temperature heat medium tank 32 includes a high-temperature inlet 322 and a high-temperature outlet 324, dividing the discharge pipe into two parts. One part is respectively connected to the heat medium pipeline outlet of the heat exchanger 31 and the high-temperature inlet 322 of the high-temperature heat medium tank 32, and the other part is respectively connected to the high-temperature outlet 324 of the high-temperature heat medium tank 32 and the inlet 211 of the air conditioner terminal 21; of course, a water pump and valves can also be set as needed. Then when the air conditioner terminal 21 does not need to work, the high-temperature outlet 324 of the high-temperature heat medium tank 32 is closed, and the hot water that has absorbed the waste heat of the air compressor 11 can enter the high-temperature heat medium tank 32 for storage to be directly used when the air conditioner terminal 21 needs to work.

[0033] At this time, since the air compressor 11 is still working and needs to be cooled; therefore, a low-temperature heat medium tank 33 is also provided on the discharge pipe. The low-temperature heat medium tank 33 includes a low-temperature inlet 332, a low-temperature outlet 334, and a liquid supplement port 334. The discharge pipe is divided into two parts. One part is respectively connected to the outlet 212 of the air conditioner terminal 21 and the low-temperature inlet 332 of the low-temperature heat medium tank 33, and the other part is respectively connected to the low-temperature outlet 334 of the low-temperature heat medium tank 33 and the heat medium pipeline inlet of the heat exchanger 31; of course, a water pump and valves can also be set as needed. Then when the air conditioner terminal 21 does not need to work while the air compressor 11 still needs to be cooled, the water whose temperature has decreased after heat exchange through the air conditioner terminal during heat supply in the low-temperature heat medium tank 33, as well as the water supplemented by the liquid supplement port 335, can ensure the continuous cooling of the air compressor 11.

[0034] If the air compressor 11 continues to operate and the air-conditioning terminal 21 continues to provide no heating, the hot water in the high-temperature heat medium tank 32 may accumulate more and more. Therefore, on the one hand, the high-temperature heat medium tank 32 and the low-temperature heat medium tank 33 are connected, and the connection position is very important. Specifically, in this embodiment, the high-temperature heat medium tank 32 is provided with a high-temperature balance port 323, and the high-temperature balance port 323 is located between the high-temperature inlet 322 and the high-temperature outlet 324 in the height position; similarly, the low-temperature heat medium tank 33 is provided with a low-temperature balance port 333, and the low-temperature balance port 333 is located between the low-temperature inlet 332 and the low-temperature outlet 334 in the height position; the high-temperature balance port 323 is connected to the low-temperature balance port 333. Therefore, when the hot water in the high-temperature heat medium tank 32 accumulates more and more and reaches the height of the high-temperature balance port 323, it will enter the low-temperature heat medium tank 33. These excess hot waters enter the low-temperature heat medium tank 33 and are cooled by the spraying action and the mixing with the cold water therein. On the other hand, in order to prevent the high-temperature heat medium tank 32 and the low-temperature heat medium tank 33 from being filled with water, resulting in an increase in the pressure of the circulation pipeline and damage, a high-temperature overflow port 321 is also provided on the high-temperature heat medium tank 32, and a low-temperature overflow port 331 is also provided on the low-temperature heat medium tank 33. The high-temperature overflow port 321 and the low-temperature overflow port 331 are both provided at the top of the tank body for discharging the excess water.

[0035] Embodiment 2

[0036] This embodiment is basically the same as Embodiment 1, and the difference lies in:

[0037] In Embodiment 1, when the hot water in the high-temperature heat medium tank 32 accumulates more and more, the excess hot water will enter the low-temperature heat medium tank 33 or be discharged from the high-temperature overflow port 321, and there is a problem of waste of this part of hot water. Therefore, in this embodiment, this part of hot water is reused.

[0038] As Figure 2 shown, the high-temperature heat medium tank 32 and the low-temperature heat medium tank 33 are connected through a medium-temperature heat medium tank 34. Specifically, the high-temperature overflow port 321, the high-temperature balance port 323, the low-temperature overflow port 331, and the low-temperature balance port 333 are respectively connected to the inside of the medium-temperature heat medium tank 34 through pipelines. Therefore, warm water with a moderate temperature obtained by mixing hot water and cold water can be obtained in the medium-temperature heat medium tank 34.

[0039] Meanwhile, the gravure printing system further includes a humidifying unit for adjusting the humidity in the workshop. Generally, the humidity in the gravure printing workshop should be controlled between 50% and 70%. This range helps to maintain the stability of the printing cylinder and the good transfer effect of the ink. If the humidity is too low, the printing cylinder may fall off due to drying, affecting the continuity of the printing process. Therefore, the humidifying unit is also one of the more important devices in the gravure printing system. The humidifying unit includes a humidifying water tank 41. Generally, the water in the humidifying water tank 41 is atomized by ultrasonic waves and then dispersed into the air. In this embodiment, the medium-temperature heat medium tank 34 is connected to the humidifying water tank 41 to supply water to the humidifying water tank 41. Since the replenished water is warm water with a certain temperature, this not only provides humidity but also slightly increases the temperature in the workshop, further making full use of the excess heat medium while reducing the heating energy consumption of the air conditioning unit. Among them, preferably, an RO filter 411 is provided between the medium-temperature heat medium tank 34 and the humidifying water tank 41, and a water pump for forcing the warm water to pass through the RO filter 411 can be set as needed to obtain purer water and ensure the safety of humidification.

[0040] In some embodiments, the excess hot water can be further utilized. As is well known, the air conditioning unit generally further includes an air outlet pipe for discharging the air in the workshop and an air inlet pipe 23 for introducing fresh air. The gravure printing ink contains some volatile substances, such as ethanol, ethyl acetate, etc., which will volatilize during the printing process. Although the gravure printing equipment itself has an exhaust device and an exhaust gas treatment device to handle the gas containing these volatile substances, inevitably, some gas will also escape into the air in the workshop, which makes the discharged gas in the air outlet pipe may contain trace amounts of volatile substances and have a certain odor. Based on this, in this embodiment, a water curtain is further provided in the air outlet pipe. The water inlet of the water curtain is connected to the high-temperature heat medium tank 32, specifically connected to the high-temperature overflow port 321 and the high-temperature balance port 323. In this way, the excess hot water is applied to the gas in the air outlet pipe. When the gas containing trace amounts of volatile substances passes through the hot water curtain, based on the principle that many water-soluble volatile substances are more soluble in hot water, many water-soluble volatile substances can be effectively dissolved and separated from the gas, improving the purity of the discharged gas.

[0041] Among them, in order to prevent the water of the water curtain from flowing back into the air conditioning unit from the air outlet pipe, as Figure 3 shown, the air outlet pipe includes a wind guiding part 221 arranged horizontally, and the water curtain is arranged in the wind guiding part 221, spraying hot water in the direction from top to bottom. Preferably, the bottom of the wind guiding part 221 is set as an inclined plane to facilitate the discharge of water.

[0042] Furthermore, the hot water dissolved with trace amounts of volatile substances can also be utilized. As Figure 3As shown in the figure, the structure of the air outlet pipe is adjusted. First, from the appearance, the air outlet pipe includes the above-mentioned horizontally arranged air guiding part 221, and also includes an air outlet part 222 vertically connected to the air guiding part 221. Second, from the internal and external structures, the air outlet pipe includes an outer shell 22a and an inner shell 22b. An air outlet channel for air outlet and provided with a water curtain is formed between the outer shell 22a and the inner shell 22b. That is to say, the outer shell 22a is composed of a part of a tubular structure and an annular disc arranged at the port of the tubular structure, and the inner shell 22b is composed of a part of a tubular structure with a smaller outer diameter and an annular disc arranged at the port of the tubular structure. Inserting the tubular structure of the inner shell 22b into the tubular structure of the outer shell 22a and fixing it can obtain the air outlet pipe of this embodiment. At this time, a circular opening is formed between the free end of the annular disc of the inner shell 22b and the free end of the annular disc of the outer shell 22a as the air outlet. When necessary, this opening can also be closed by an annular plate and then holes are opened on the annular plate as the air outlet. Among them, the water outlet of the water curtain is arranged at the inner top of the air guiding part 221, and the water coming out of the water curtain will fall on the outer wall of the tubular structure of the inner shell 22b and then fall on the inner wall of the tubular structure of the outer shell 22a.

[0043] Based on this, on the one hand, the horizontal air inlet pipe 23 is arranged in the tubular structure of the inner shell 22b. Then, when the water with a certain temperature coming out of the water curtain falls on the outer wall of the tubular structure of the inner shell 22b, it can preheat the fresh air in the water inlet pipe 23. When the air-conditioning terminal 21 needs to supply heat, the energy consumption of the air-conditioning terminal 21 can be reduced.

[0044] On the other hand, the bottom part of the outer shell 22a can be set as a structure that slopes horizontally downward to facilitate the discharge of water. Therefore, in the part where the air outlet of the air outlet pipe faces downward, there is a part that is a drainage part for water discharge, and this part of the water can be directly discharged. Further, in some embodiments, the gravure system further includes an oven 12 for drying printed articles. A humidifier is provided in the oven 12. The function of the humidifier in the oven is to prevent problems such as curling during the drying process of the printed articles. By connecting the drainage part to the humidifier in the oven, this part of the water can be reused. Since volatile gases are generated in the oven itself, the water containing trace volatile gases is used for humidification therein and will not cause adverse effects.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art of the present utility model can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. An intaglio printing system using the waste heat of an air compressor, characterized in that: It includes an intaglio printing device arranged in a workshop factory building, and the intaglio printing device includes an air compressor (11); It further includes an air-conditioning unit for adjusting the temperature in the workshop factory building, and the air-conditioning unit includes an air-conditioning terminal (21) for heating air; It further includes a heat exchanger (31) for exchanging the waste heat of the air compressor (11) with a heat medium; The heat exchanger (31) is communicated with the air-conditioning terminal (21) through a circulation pipeline, and the circulation pipeline includes a discharge pipe for sending the heat medium from the heat exchanger (31) to the air-conditioning terminal (21), and a discharge pipe for sending the heat medium from the air-conditioning terminal (21) back to the heat exchanger (31); A high-temperature heat medium tank (32) is provided in the discharge pipe, a low-temperature heat medium tank (33) is provided in the discharge pipe, and the low-temperature heat medium tank (33) is provided with a liquid replenishing port (335).

2. The intaglio printing system using the waste heat of an air compressor according to claim 1, characterized in that: The high-temperature heat medium tank (32) is sequentially provided with a high-temperature overflow port (321), a high-temperature inlet (322), a high-temperature balance port (323), and a high-temperature outlet (324) in the vertical direction from top to bottom; The low-temperature heat medium tank (33) is sequentially provided with a low-temperature overflow port (331), a low-temperature inlet (332), a low-temperature balance port (333), and a low-temperature outlet (334) in the vertical direction from top to bottom; The high-temperature balance port (323) is communicated with the low-temperature balance port (333).

3. The gravure printing system using the waste heat of an air compressor according to claim 1 or 2, characterized in that: The heat medium is water.

4. The intaglio printing system using the waste heat of an air compressor according to claim 3, characterized in that: The high-temperature heat medium tank (32) is communicated with the low-temperature heat medium tank (33) through a medium-temperature heat medium tank (34); The intaglio printing system further includes a humidifying unit for adjusting the humidity in the workshop factory building, and the humidifying unit includes a humidifying water tank (41); The medium-temperature heat medium tank (34) is communicated with the humidifying water tank (41).

5. The gravure printing system using the waste heat of an air compressor according to claim 4, wherein: An RO filter (411) is provided between the medium-temperature heat medium tank (34) and the humidifying water tank (41).

6. The intaglio printing system using the waste heat of an air compressor according to claim 3, characterized in that: The air-conditioning unit further includes an air outlet pipe for discharging the air in the workshop factory building, and a water curtain is provided in the air outlet pipe; The water inlet of the water curtain is communicated with the high-temperature heat medium tank (32).

7. The gravure printing system using the waste heat of an air compressor according to claim 6, characterized in that: The air outlet pipe includes a horizontally arranged air guiding part (221), and the water curtain is arranged in the air guiding part (221).

8. The gravure printing system using the waste heat of an air compressor according to claim 7, wherein: The air outlet pipe further includes an air outlet part (222) vertically connected to the air guiding part (221).

9. The intaglio printing system using the waste heat of an air compressor according to claim 8, characterized in that: The air outlet pipe includes an outer shell (22a) and an inner shell (22b), and an air outlet channel for air outlet and provided with the water curtain is formed between the outer shell (22a) and the inner shell (22b); The air-conditioning unit further includes an air inlet pipe (23) for introducing fresh air, and the air inlet pipe (23) is arranged in the air guiding part (221) of the inner shell (22b).

10. The gravure printing system using the waste heat of an air compressor according to claim 6, characterized in that: The intaglio printing device further includes an oven (12) for drying printed articles, and a humidifier is provided in the oven (12); The nozzle of the air outlet pipe includes a drainage part for discharging water, and the drainage part is communicated with the humidifier.

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