Evaporator air inlet distribution device for improving heat efficiency of carbon dioxide heat pump of gravure printing machine

Abstract

The utility model discloses improve evaporimeter air intake distribution device of carbon dioxide heat pump heat efficiency of gravure press, including gravure press oven, gravure press oven is connected with the export of air intake fan through air intake pipe, and gravure press oven still connects one end of heat exchanger through air return pipe, and the other end of heat exchanger connects the entrance of air return fan, and the export of air return fan is connected to the air return air -collecting chamber. Adopt the utility model can improve the working efficiency of evaporimeter, and reduce the loss.

Description

Technical Field

[0001] This utility model belongs to the technical field of drying systems for gravure printing machines, and relates to an evaporator air inlet distribution device for improving the thermal efficiency of carbon dioxide heat pumps in gravure printing machines. Background Technology

[0002] The drying system of a gravure printing press is crucial for ensuring the quality of gravure printing and is also a significant factor affecting its efficiency. Gravure printing is generally a unit-based process; after one unit finishes printing, the next unit needs to process the next color. During this process, the printed image of the previous color must be thoroughly dried. If it is not thoroughly dried, print quality problems will occur when printing the next color. Therefore, the drying system of a gravure printing press plays a vital role in gravure printing.

[0003] Because water evaporates less readily than organic solvents, gravure printing presses for water-based inks often operate at slower speeds to ensure sufficient evaporation and drying of the inks. Many manufacturers attempt to accelerate gravure printing with water-based inks by increasing heating power and lengthening drying ovens. Therefore, the drying system is the most energy-intensive component of gravure printing. Now, the advent of carbon dioxide heat pumps, which can effectively generate significant heat through phase change, thus saving energy, presents a promising solution to the high energy consumption of gravure printing press drying systems.

[0004] For gravure printing, the key components are the phase change of carbon dioxide—its heating and cooling medium: the evaporator and the condenser. The evaporator converts liquid carbon dioxide into a gaseous state by absorbing heat. The condenser converts carbon dioxide from a gaseous state to a liquid state by releasing the latent heat of phase change. The evaporator absorbs heat from its surroundings, causing the carbon dioxide inside to undergo a phase change. Its interior is a porous flat tube. Liquid carbon dioxide flows through a manifold, then through the porous flat tube, and finally through a bend to the outlet. During this process, it continuously absorbs external heat, gradually causing the carbon dioxide inside to completely vaporize. Experiments show that different temperatures affect the vaporization efficiency of carbon dioxide. The longer flow path of carbon dioxide in the porous flat tube ensures complete vaporization. Analysis shows that when carbon dioxide enters the manifold, its dryness is zero, making it easy to absorb heat and vaporize. However, as the dryness increases, its heat absorption capacity decreases. Therefore, a high ambient temperature in the initial stage is conducive to improving the gasification efficiency of carbon dioxide. Utility Model Content

[0005] The purpose of this invention is to provide an evaporator air inlet distribution device that improves the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine. Using this device can improve the working efficiency of the evaporator and reduce losses.

[0006] The technical solution adopted in this utility model is an evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine. The device includes a gravure printing machine oven, which is connected to the outlet of an air inlet fan via an air inlet pipe. The oven is also connected to one end of a heat exchanger via a return air pipe. The other end of the heat exchanger is connected to the inlet of a return air fan, and the outlet of the return air fan is connected to a return air collection chamber.

[0007] The features of this utility model also include: The evaporator has a perforated flat tube along the vertical direction. Corrugated fins are provided at the upper and lower ends of the perforated flat tube. The corrugated fins at the upper end of the perforated flat tube are connected to the carbon dioxide outlet collection pipe. The top of the evaporator is also provided with a carbon dioxide inlet collection pipe.

[0008] The carbon dioxide outlet and inlet collection pipes are arranged side by side, and both the carbon dioxide outlet and inlet collection pipes have an open end and a blind end.

[0009] The open end of the carbon dioxide outlet and collection pipe is equipped with a carbon dioxide outlet port.

[0010] The open end of the carbon dioxide inlet and collection pipe is equipped with a carbon dioxide inlet and collection pipe.

[0011] The return air collection chamber has a side outlet on its side.

[0012] An evaporator air inlet distribution device is installed on the side of the return air collection chamber outlet via the evaporator air inlet distributor flange.

[0013] The evaporator air inlet distribution device includes an evaporator air inlet distributor collecting pipe, and an evaporator air inlet distribution device through pipe is fixedly connected to the side of the evaporator air inlet distributor collecting pipe. The evaporator air inlet distribution device through pipe is located between the evaporator air inlet distributor collecting pipe and the front end of the evaporator air inlet distribution device.

[0014] The beneficial effects of this invention are: the device can guide high-temperature return air to the front end of the evaporator through the opening position and air guiding structure, so as to facilitate better and more complete vaporization of carbon dioxide inside the evaporator, thereby improving the working efficiency of the evaporator and reducing losses. This invention improves the heat pump structure used in the drying system of a gravure printing machine by adding an air inlet distribution device to the evaporator, leading the high-temperature hot air to the front of the evaporator, that is, the front of the porous flat tube in the evaporator through the pipeline, thereby improving the working efficiency of the evaporator. Attached Figure Description

[0015] Figure 1 This is a simplified structural diagram of the evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine, according to the present invention. Figure 2 This is a simplified front view diagram illustrating the working principle of the evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine according to this utility model. Figure 3 A simplified side view of the working principle of the evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine according to this utility model. Figure 4 The working principle diagram of the evaporator air inlet distribution device for improving the thermal efficiency of carbon dioxide heat pump in gravure printing machine is shown below. Figure 5 This is a structural diagram of the evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine, according to this utility model.

[0016] In the diagram, 1. Inlet duct, 2. Gravure printing oven, 3. Return duct, 4. Heat exchanger, 5. Evaporator, 6. Return air collection chamber, 7. Return air fan, 8. Inlet fan, 9. Carbon dioxide outlet, 10. Carbon dioxide outlet collection pipe, 11. Porous flat pipe, 12. Corrugated fins, 13. Carbon dioxide inlet collection pipe, 14. Carbon dioxide inlet interface, 15. Bending pipe, 16. Evaporator inlet distributor outlet, 17. Evaporator inlet distributor front end, 18. External air inlet, 19. Evaporator inlet distributor air duct, 20. Evaporator inlet distributor collection pipe, 21. Return air collection chamber side outlet, 22. Evaporator inlet distributor flange. Detailed Implementation

[0017] The following detailed description is provided in conjunction with specific implementation methods.

[0018] This utility model relates to an evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in gravure printing machines. It is primarily used in the drying system of gravure printing machines (drying systems of carbon dioxide heat pump types) to improve the vaporization efficiency of the evaporator. For example... Figure 1 As shown, the gravure printing press drying system provides high-temperature air to the gravure printing press oven 2 to dry the ink on the surface of the printed matter after it has passed through the oven 2. The gravure printing press oven 2 is connected to the outlet of the inlet fan 8 in the drying system via an inlet duct 1. To save energy, the gravure printing press oven 2 is also connected to one side of the heat exchanger 4 in the drying system via a return air duct 3. The other side of the heat exchanger 4 is connected to the inlet of the return air fan 7, and the outlet of the return air fan 7 is connected to the return air collection chamber 6. Figure 2 , 3As shown, the evaporator air inlet distributor outlet 16 of this evaporator air inlet distribution device extends to the upper end of the evaporator 5. The evaporator 5 has a carbon dioxide outlet port 9, a carbon dioxide outlet collecting pipe 10, a porous flat pipe 11, corrugated fins 12, a carbon dioxide inlet collecting pipe 13, and a carbon dioxide inlet port 14. Carbon dioxide, in liquid form, enters the carbon dioxide inlet collecting pipe 13 through the carbon dioxide inlet port 14 and then flows into the porous flat pipe 11. Due to pressure changes, the carbon dioxide undergoes continuous phase change as it flows through the porous flat pipe 11, changing from liquid to gas. This phase change process requires heat absorption from the outside. The corrugated fins 12, connected to the porous flat pipe 11, increase the contact area with the outside air, thus facilitating heat absorption. Of course, different outside air temperatures will affect the degree of vaporization of the liquid carbon dioxide in the porous flat pipe 11. Carbon dioxide flows through the porous flat tube 11, then through the bent tube 15 into the pipeline of the porous flat tube 11 on the other side, and then into the carbon dioxide outlet collection pipe 10, and then into the carbon dioxide outlet port 9, from where it flows into the pipeline. The degree of vaporization of carbon dioxide in the evaporator 5 affects the efficiency of the heat pump, so it is very critical. Figure 4 As shown, the side of the return air collection chamber 6 has a return air collection chamber side outlet 21, through which a developed evaporator air inlet distribution device is installed.

[0019] Research shows that higher temperatures lead to a higher degree of vaporization. Therefore, the higher temperature at the beginning of the porous flat tube 11 in the evaporator 5 is beneficial for the overall vaporization of carbon dioxide. Thus, the developed evaporator air inlet distribution device guides the high-temperature return air from the return air collection chamber 6 to the front end of the evaporator 5. Figure 5 As shown, the evaporator air inlet distribution device is installed at the outlet 21 on the return air collection chamber side and is fixed by the evaporator air inlet distribution device flange 22. An evaporator air inlet distribution device through-duct 19 is fixedly connected to the side of the evaporator air inlet distribution device collection duct 20. The evaporator air inlet distribution device through-duct 19 consists of multiple small pipes connected between the evaporator air inlet distribution device collection duct 20 and the front end 17 of the evaporator air inlet distribution device. This is mainly to ensure that fresh air entering from the outside air inlet 18 can also pass through the evaporator air inlet distribution device and contact the surface of the evaporator 5. The front end 17 of the evaporator air inlet distribution device has an evaporator air inlet distribution device outlet 16, which faces the front of the evaporator 5.

[0020] This device is primarily used to improve the vaporization efficiency of the evaporator in the carbon dioxide heat pump of a gravure printing press drying system. The developed evaporator air inlet distribution device, designed to improve the thermal efficiency of the carbon dioxide heat pump, is installed on the side of the return air collection chamber 6 of the carbon dioxide heat pump and above the evaporator 5 via an evaporator air inlet distributor flange 22. An external air inlet 18 is located above the evaporator 5 to allow ambient air to enter. The side of the return air collection chamber 6 has a return air collection chamber side outlet 21, which guides the high-temperature return air from the return air collection chamber 6 to the top of the evaporator 5. By installing the evaporator air inlet distribution device, this high-temperature return air can be directed to the front of the evaporator.

[0021] The specific working principle is as follows: The inlet fan 8 draws high-temperature gas from the heat pump into the gravure printing machine oven 2 through the inlet pipe 1. After drying the gravure products, the dried high-temperature gas returns to the heat pump through the return air pipe 3. First, this high-temperature gas passes through the heat exchanger 4, heating the flowing drying air. Then, the return air, still maintaining a relatively high temperature, is forced into the return air collection chamber 6 by the return air fan 7, where the hot air forms a high air pressure.

[0022] The hot return air in the return air collection chamber 6 flows into the evaporator air inlet distribution device connected to the side of the return air collection chamber 6 through the return air collection chamber side outlet 21. The evaporator air inlet distribution device consists of the evaporator air inlet distribution device front end 17, the evaporator air inlet distribution device through-duct 19, and the evaporator air inlet distribution device collecting duct 20. The lower part of the evaporator air inlet device front end 17 has multiple long slots with a width of 10mm - the evaporator air inlet distribution device outlet 16, to ensure that the high-temperature return air is blown more evenly to the front end of the evaporator 5. In this way, the high-temperature return air first flows into the evaporator air inlet distribution device collecting duct 20 through the return air collection chamber side outlet 21. Due to the high pressure, it flows into the evaporator air inlet distribution device front end 17 through the multiple evaporator air inlet distribution device through-ducts 19 connected to the evaporator air inlet distribution device collecting duct 20, and is blown to the front end of the evaporator 5 through the evaporator air inlet distribution device outlet 16 at the bottom of the evaporator air inlet distribution device front end 17. The evaporator air inlet distribution device air duct 19 is arranged at certain intervals with the evaporator air inlet distribution device collecting duct 20 and the front end 17 of the evaporator air inlet distribution device. The advantage of this is that it will not prevent the external ambient gas from entering the surface of the evaporator 5 through the external air inlet 18.

[0023] The flow of carbon dioxide on evaporator 5 is as follows: First, liquid carbon dioxide flows into carbon dioxide inlet collection pipe 13 through carbon dioxide inlet port 14. Then, due to high pressure, it flows through the upper holes of porous flat tube 11 across the surface of evaporator 5. Outside air blows onto the surface of evaporator 5 and flows through corrugated fins 12. Corrugated fins 12 are in full contact with the outside air, generating heat transfer. This heat is conducted through the surface material of porous flat tube 11 to the liquid carbon dioxide inside, where it is absorbed, providing energy for carbon dioxide vaporization. Then, partially vaporized carbon dioxide flows through bent tube 15 into the lower hole of porous flat tube 11, and into carbon dioxide outlet collection pipe 10, exiting through carbon dioxide outlet port 9. At this point, the carbon dioxide should have been completely vaporized.

[0024] As mentioned earlier, the higher the dryness (the proportion of gaseous carbon dioxide), the less easily carbon dioxide absorbs heat. Therefore, to enable it to absorb heat fully, the air temperature at its front end needs to be relatively high. The design of this utility model is to transplant high-temperature return air to the front end of the evaporator to improve the vaporization efficiency of carbon dioxide.

[0025] This utility model relates to a structural improvement of a carbon dioxide heat pump drying system for gravure printing machines to enhance thermal efficiency. By rationally distributing the inlet air temperature at different locations within the evaporator, the carbon dioxide inside the evaporator is fully evaporated, saving energy and reducing losses. The device can guide high-temperature return air to the front end of the evaporator through opening positions and air guiding structures, facilitating better and more complete vaporization of carbon dioxide inside the evaporator, thereby improving the evaporator's operating efficiency and reducing losses.

[0026] Example 1 An evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine includes a gravure printing machine oven 2. The gravure printing machine oven 2 is connected to the outlet of an air inlet fan 8 via an air inlet pipe 1. The gravure printing machine oven 2 is also connected to one end of a heat exchanger 4 via a return air pipe 3. The other end of the heat exchanger 4 is connected to the inlet of a return air fan 7. The outlet of the return air fan 7 is connected to a return air collection chamber 6.

[0027] Example 2 An evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine includes a gravure printing machine oven 2. The gravure printing machine oven 2 is connected to the outlet of an air inlet fan 8 via an air inlet pipe 1. The gravure printing machine oven 2 is also connected to one end of a heat exchanger 4 via a return air pipe 3. The other end of the heat exchanger 4 is connected to the inlet of a return air fan 7. The outlet of the return air fan 7 is connected to a return air collection chamber 6.

[0028] The evaporator 5 is provided with a perforated flat tube 11 along the vertical direction. Corrugated fins 12 are provided at the upper and lower ends of the perforated flat tube 11. The corrugated fins 12 located at the upper end of the perforated flat tube 11 are connected to the carbon dioxide outlet collection pipe 10. The top of the evaporator 5 is also provided with a carbon dioxide inlet collection pipe 13.

[0029] Example 3 An evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine includes a gravure printing machine oven 2. The gravure printing machine oven 2 is connected to the outlet of an air inlet fan 8 via an air inlet pipe 1. The gravure printing machine oven 2 is also connected to one end of a heat exchanger 4 via a return air pipe 3. The other end of the heat exchanger 4 is connected to the inlet of a return air fan 7. The outlet of the return air fan 7 is connected to a return air collection chamber 6.

[0030] The evaporator 5 is provided with a perforated flat tube 11 along the vertical direction. Corrugated fins 12 are provided at the upper and lower ends of the perforated flat tube 11. The corrugated fins 12 located at the upper end of the perforated flat tube 11 are connected to the carbon dioxide outlet collection pipe 10. The top of the evaporator 5 is also provided with a carbon dioxide inlet collection pipe 13.

[0031] The carbon dioxide outlet collection pipe 10 and the carbon dioxide inlet collection pipe 13 are arranged side by side, and both the carbon dioxide outlet collection pipe 10 and the carbon dioxide inlet collection pipe 13 have an open end and a blind end.

[0032] Example 4 An evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine includes a gravure printing machine oven 2. The gravure printing machine oven 2 is connected to the outlet of an air inlet fan 8 via an air inlet pipe 1. The gravure printing machine oven 2 is also connected to one end of a heat exchanger 4 via a return air pipe 3. The other end of the heat exchanger 4 is connected to the inlet of a return air fan 7. The outlet of the return air fan 7 is connected to a return air collection chamber 6.

[0033] The evaporator 5 is provided with a perforated flat tube 11 along the vertical direction. Corrugated fins 12 are provided at the upper and lower ends of the perforated flat tube 11. The corrugated fins 12 located at the upper end of the perforated flat tube 11 are connected to the carbon dioxide outlet collection pipe 10. The top of the evaporator 5 is also provided with a carbon dioxide inlet collection pipe 13.

[0034] The carbon dioxide outlet collection pipe 10 and the carbon dioxide inlet collection pipe 13 are arranged side by side, and both the carbon dioxide outlet collection pipe 10 and the carbon dioxide inlet collection pipe 13 have an open end and a blind end.

[0035] The open end of the carbon dioxide outlet and collection pipe 10 is provided with a carbon dioxide outlet port 9.

[0036] Example 5 An evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine includes a gravure printing machine oven 2. The gravure printing machine oven 2 is connected to the outlet of an air inlet fan 8 via an air inlet pipe 1. The gravure printing machine oven 2 is also connected to one end of a heat exchanger 4 via a return air pipe 3. The other end of the heat exchanger 4 is connected to the inlet of a return air fan 7. The outlet of the return air fan 7 is connected to a return air collection chamber 6.

[0037] The evaporator 5 is provided with a perforated flat tube 11 along the vertical direction. Corrugated fins 12 are provided at the upper and lower ends of the perforated flat tube 11. The corrugated fins 12 located at the upper end of the perforated flat tube 11 are connected to the carbon dioxide outlet collection pipe 10. The top of the evaporator 5 is also provided with a carbon dioxide inlet collection pipe 13.

[0038] The carbon dioxide outlet collection pipe 10 and the carbon dioxide inlet collection pipe 13 are arranged side by side, and both the carbon dioxide outlet collection pipe 10 and the carbon dioxide inlet collection pipe 13 have an open end and a blind end.

[0039] The open end of the carbon dioxide outlet collection pipe 10 is provided with a carbon dioxide outlet port 9. The open end of the carbon dioxide inlet collection pipe 13 is provided with a carbon dioxide inlet collection pipe 13.

[0040] Example 6 An evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine includes a gravure printing machine oven 2. The gravure printing machine oven 2 is connected to the outlet of an air inlet fan 8 via an air inlet pipe 1. The gravure printing machine oven 2 is also connected to one end of a heat exchanger 4 via a return air pipe 3. The other end of the heat exchanger 4 is connected to the inlet of a return air fan 7. The outlet of the return air fan 7 is connected to a return air collection chamber 6.

[0041] The evaporator 5 is provided with a perforated flat tube 11 along the vertical direction. Corrugated fins 12 are provided at the upper and lower ends of the perforated flat tube 11. The corrugated fins 12 located at the upper end of the perforated flat tube 11 are connected to the carbon dioxide outlet collection pipe 10. The top of the evaporator 5 is also provided with a carbon dioxide inlet collection pipe 13.

[0042] The carbon dioxide outlet collection pipe 10 and the carbon dioxide inlet collection pipe 13 are arranged side by side, and both the carbon dioxide outlet collection pipe 10 and the carbon dioxide inlet collection pipe 13 have an open end and a blind end.

[0043] The open end of the carbon dioxide outlet collecting pipe 10 is provided with a carbon dioxide outlet port 9. The open end of the carbon dioxide inlet collecting pipe 13 is provided with a carbon dioxide inlet collecting pipe 13. The side of the return air collecting chamber 6 is provided with a return air collecting chamber side outlet 21.

[0044] Example 7 An evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine includes a gravure printing machine oven 2. The gravure printing machine oven 2 is connected to the outlet of an air inlet fan 8 via an air inlet pipe 1. The gravure printing machine oven 2 is also connected to one end of a heat exchanger 4 via a return air pipe 3. The other end of the heat exchanger 4 is connected to the inlet of a return air fan 7. The outlet of the return air fan 7 is connected to a return air collection chamber 6.

[0045] The evaporator 5 is provided with a perforated flat tube 11 along the vertical direction. Corrugated fins 12 are provided at the upper and lower ends of the perforated flat tube 11. The corrugated fins 12 located at the upper end of the perforated flat tube 11 are connected to the carbon dioxide outlet collection pipe 10. The top of the evaporator 5 is also provided with a carbon dioxide inlet collection pipe 13.

[0046] The carbon dioxide outlet collection pipe 10 and the carbon dioxide inlet collection pipe 13 are arranged side by side, and both the carbon dioxide outlet collection pipe 10 and the carbon dioxide inlet collection pipe 13 have an open end and a blind end.

[0047] The open end of the carbon dioxide outlet collecting pipe 10 is provided with a carbon dioxide outlet port 9. The open end of the carbon dioxide inlet collecting pipe 13 is provided with a carbon dioxide inlet collecting pipe 13. The side of the return air collecting chamber 6 is provided with a return air collecting chamber side outlet 21. An evaporator air inlet distribution device is installed on the side of the return air collecting chamber side outlet 21 through the evaporator air inlet distributor flange 22.

[0048] Example 8 An evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine includes a gravure printing machine oven 2. The gravure printing machine oven 2 is connected to the outlet of an air inlet fan 8 via an air inlet pipe 1. The gravure printing machine oven 2 is also connected to one end of a heat exchanger 4 via a return air pipe 3. The other end of the heat exchanger 4 is connected to the inlet of a return air fan 7. The outlet of the return air fan 7 is connected to a return air collection chamber 6.

[0049] The evaporator 5 is provided with a perforated flat tube 11 along the vertical direction. Corrugated fins 12 are provided at the upper and lower ends of the perforated flat tube 11. The corrugated fins 12 located at the upper end of the perforated flat tube 11 are connected to the carbon dioxide outlet collection pipe 10. The top of the evaporator 5 is also provided with a carbon dioxide inlet collection pipe 13.

[0050] The carbon dioxide outlet collection pipe 10 and the carbon dioxide inlet collection pipe 13 are arranged side by side, and both the carbon dioxide outlet collection pipe 10 and the carbon dioxide inlet collection pipe 13 have an open end and a blind end.

[0051] The open end of the carbon dioxide outlet collecting pipe 10 is provided with a carbon dioxide outlet port 9. The open end of the carbon dioxide inlet collecting pipe 13 is provided with a carbon dioxide inlet collecting pipe 13. The side of the return air collecting chamber 6 is provided with a return air collecting chamber side outlet 21. An evaporator air inlet distribution device is installed on the side of the return air collecting chamber side outlet 21 through the evaporator air inlet distributor flange 22. The evaporator air inlet distribution device includes an evaporator air inlet distributor collecting pipe 20, and an evaporator air inlet distribution device through pipe 19 is fixedly connected to the side of the evaporator air inlet distributor collecting pipe 20. The evaporator air inlet distribution device through pipe 19 is located between the evaporator air inlet distributor collecting pipe 20 and the front end 17 of the evaporator air inlet distribution device.

Claims

1. An evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine, characterized in that: The equipment includes a gravure printing machine oven (2), which is connected to the outlet of an air inlet fan (8) via an air inlet pipe (1). The gravure printing machine oven (2) is also connected to one end of a heat exchanger (4) via a return air pipe (3). The other end of the heat exchanger (4) is connected to the inlet of a return air fan (7), and the outlet of the return air fan (7) is connected to the return air collection chamber (6).

2. The evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine according to claim 1, characterized in that: The evaporator (5) is provided with a perforated flat tube (11) along the vertical direction. Corrugated fins (12) are provided at the upper and lower ends of the perforated flat tube (11). The corrugated fins (12) at the upper end of the perforated flat tube (11) are connected to the carbon dioxide outlet collection pipe (10). The top of the evaporator (5) is also provided with a carbon dioxide inlet collection pipe (13).

3. The evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine according to claim 2, characterized in that: The carbon dioxide outlet collection pipe (10) and the carbon dioxide inlet collection pipe (13) are arranged side by side, and both the carbon dioxide outlet collection pipe (10) and the carbon dioxide inlet collection pipe (13) have an open end and a blind end.

4. The evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine according to claim 3, characterized in that: The carbon dioxide outlet collection pipe (10) is provided with a carbon dioxide outlet port (9) at its open end.

5. The evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine according to claim 3, characterized in that: The carbon dioxide inlet and collection pipe (13) is provided at its open end.

6. The evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine according to claim 3, characterized in that: The return air collection chamber (6) is provided with a return air collection chamber side outlet (21) on its side.

7. The evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine according to claim 6, characterized in that: An evaporator air inlet distribution device is installed on the side of the return air collection chamber outlet (21) via the evaporator air inlet distributor flange (22).

8. The evaporator air inlet distribution device for improving the thermal efficiency of a carbon dioxide heat pump in a gravure printing machine according to claim 7, characterized in that: The evaporator air inlet distribution device includes an evaporator air inlet distribution collector pipe (20), and an evaporator air inlet distribution device through pipe (19) is fixedly connected to the side of the evaporator air inlet distribution collector pipe (20). The evaporator air inlet distribution device through pipe (19) is located between the evaporator air inlet distribution collector pipe (20) and the front end (17) of the evaporator air inlet distribution device.

Images