Energy-saving air supply unit and coating machine with same

Abstract

The utility model relates to an energy-saving air supply unit and a coating machine with the same. The energy-saving air supply unit comprises an air supply unit and a coating machine, air in the air supply unit enters from one side of the front section of the energy saver, the front section of the energy saver is heated, a medium in the energy saver absorbs heat to be vaporized, pressure difference is generated in the energy saver and flows to the rear section, the air absorbs heat at the front section to achieve the precooling effect, and then the air enters the evaporator to be cooled and dehumidified and then passes through the rear section of the energy saver. As the front section of the energy saver transfers part of heat to the rear section, the working medium in the energy saver releases heat and then is condensed into a liquid state, the liquid working medium returns to the front section again and is heated and vaporized, and air passing through the rear section of the energy saver is preheated. The preheated air is heated to the high temperature required by coating through the condenser and the steam section in sequence, is fed into the main machine through the air pipe to be matched with the liquid supply system for coating, is treated by the dust remover and the main fan and is discharged out of the device.

Description

Technical Field

[0001] The present application relates to the field of energy-saving air supply, and in particular to an energy-saving air supply unit and a coating machine having the same. Background Art

[0002] The coating machine is an integrated device that can coat tablets, pills, candies, etc. with organic film, water-soluble film, slow-release and controlled-release coatings. It is mostly used in the pharmaceutical, chemical, food and other industries. The coating machine can make the surface of the tablet core get a uniform and high-quality film coating or sugar coating, so that the surface of the tablet core is protected from moisture, mildew and damage. At the same time, it can coat the tablet with a colorful outer coating to increase the drug recognition, relieve the pain of patients taking the medicine during the medication process, avoid irritating the stomach or maintain the pharmacological effect in the intestines while coating the enteric coating.

[0003] In the conventional scale mode of the existing coating machine, the outdoor fresh air needs to be cooled and dehumidified after entering the air supply unit. This process makes the temperature of the outdoor fresh air low, and then the low-temperature outdoor fresh air needs to be heated to a high temperature state through steam heating. The energy consumption in the process is large, and the energy of the outdoor fresh air cannot be reused, resulting in low energy utilization rate and large loss of the device. Utility Model Content

[0004] In view of this, the present application proposes an energy-saving air supply unit and a coating machine having the same, which can increase the overall energy utilization rate of the device by recovering and reusing the heat energy in the air.

[0005] According to one aspect of the present application, there is provided an energy-saving air supply unit, comprising: a chassis shell, an economizer, an evaporator, a condenser and a steam section.

[0006] The economizer, the evaporator, the condenser and the steam section are all arranged in the chassis shell; the economizer is arranged on both sides of the inlet end and the outlet end of the evaporator, the one arranged on the side of the inlet end of the evaporator is the front section of the economizer, and the one arranged on the side of the outlet end of the evaporator is the rear section of the economizer, the front section of the economizer is arranged close to the inlet end of the air supply unit, the condenser is arranged on the rear side of the economizer, the steam section is arranged on the rear side of the outlet end of the condenser, and the outlet end of the steam section is arranged close to the outlet end of the air supply unit.

[0007] In a possible implementation, the top view of the energy saver is a "凵"-shaped structure. The inside of the energy saver is connected. The two longitudinal sides of the energy saver are respectively the front section and the rear section of the energy saver. A connecting section of the energy saver is provided between the front section and the rear section of the energy saver; the evaporator is arranged between the front section and the rear section of the energy saver, and the inlet end of the evaporator is arranged close to the front section of the energy saver, and the outlet end of the evaporator is arranged close to the rear section of the energy saver.

[0008] In a possible implementation, it further includes: a primary filter, a maintenance section, a flow equalizing section, a supply fan, and a secondary filter; the primary filter, the front section of the energy saver, the evaporator, the rear section of the energy saver, the condenser, the maintenance section, the flow equalizing section, the supply fan, the steam section, and the secondary filter are sequentially arranged in the chassis housing; wherein, the primary filter is arranged at one end close to the air inlet of the chassis housing, and the secondary filter is arranged at one end close to the air outlet of the chassis housing.

[0009] In a possible implementation, the chassis housing is a double-layer box structure up and down. The air inlet of the air supply unit is arranged at the bottom layer of the chassis housing, and the air outlet of the air supply unit is arranged at the top layer of the chassis housing. The bottom layer and the top layer of the chassis housing are connected.

[0010] In a possible implementation, it further includes: a primary filter, a maintenance section, a flow equalizing section, a supply fan, and a secondary filter; the primary filter, the front section of the energy saver, the evaporator, the rear section of the energy saver, and the condenser are sequentially arranged in the bottom layer of the chassis housing, and the primary filter is arranged on the side close to the air inlet; the flow equalizing section, the supply fan, the steam section, and the secondary filter are sequentially arranged in the top layer of the chassis housing, and the secondary filter is arranged on the side close to the air outlet; the maintenance section is arranged at the bottom of the flow equalizing section, and the maintenance section and the flow equalizing section are connected.

[0011] In a possible implementation, it further includes: a compressor and a throttling expansion valve; the evaporator and the condenser are connected by pipelines and are connected in a loop; the evaporator is connected to the inlet end of the compressor by a pipeline, the outlet end of the compressor is connected to the condenser by a pipeline, the condenser is connected to the inlet end of the throttling expansion valve by a pipeline, and the outlet end of the throttling expansion valve is connected to the evaporator by a pipeline.

[0012] In one possible implementation, the energy saver is provided with fastening bolts and washers; the fastening bolts are provided in plurality on the front section, the rear section and the connecting section of the energy saver, and the fastening bolts fix the energy saver in the chassis shell; the washers are provided in plurality on the front section, the rear section and the connecting section of the energy saver.

[0013] In a possible implementation, the thickness of the front section of the economizer is equal to the thickness of the rear section of the economizer.

[0014] According to another aspect of the present application, a coating machine is provided, comprising: a liquid supply system, a main machine, a dust collector, a main fan and the above-mentioned energy-saving air supply group; the outlet end of the air supply group is connected to the main machine by a pipeline, the liquid supply system is arranged beside the main machine and is connected to the main machine, the outlet end of the main machine is connected to the inlet end of the dust collector by a pipeline, the outlet end of the dust collector is connected to the main fan by a pipeline, and the main fan is suitable for being connected to the outside of the device.

[0015] In a possible implementation, a regulating valve is provided on the pipeline between the coating machine and the air supply unit, and the regulating valve is provided on a side close to the coating machine.

[0016] The beneficial effects of the present application are as follows: an economizer, an evaporator, a condenser and a steam section are arranged in the chassis shell of the air supply unit. In summer, the hot and humid outdoor air enters through one side of the front section of the economizer. At this time, after the front section of the economizer is heated, the medium inside absorbs heat and vaporizes, generating a pressure difference inside the economizer and flowing to the rear section of the economizer. At this time, the outdoor air is cooled after absorbing heat to achieve a pre-cooling effect. Then the air enters the evaporator for cooling and dehumidification. After reaching the required humidity requirement, it passes through the rear section of the economizer. Since the front section of the economizer has transferred part of the heat to the rear section, the working fluid in the economizer releases heat and condenses into liquid. The liquid working fluid returns to the front section in the pipeline to be heated and vaporized again. In this reciprocating cycle, the air passing through the rear section of the economizer will be preheated, the preheated air enters the condenser for heating, and then flows into the steam section to be heated to the high temperature required for coating by steam and sent to the subsequent processing device.

[0017] The air supply unit can be used to process the outdoor air input to the coating machine. The outdoor fresh air is cooled, dehumidified and heated by the air supply unit before entering the main unit through the air duct and cooperating with the liquid supply system to coat the drugs. It is then discharged outside the device after being processed by the dust collector and the main fan.

[0018] According to an energy-saving air supply unit and a coating machine having the same, the energy utilization rate of the entire device can be increased by recycling and reusing thermal energy, and the treated outdoor air can be transmitted to subsequent devices, making full use of the heat absorbed from the air in the surface cooling and dehumidification stage, and using the heat to perform two-stage preheating of the air passing through the rear section of the economizer and the condenser, which can effectively reduce the amount of steam required for the subsequent steam section and reduce the energy consumption of the boiler to generate steam.

[0019] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1 A schematic cross-sectional structure diagram of an energy-saving air supply unit and an air supply unit of a coating machine having the same according to an embodiment of the present application is shown;

[0022] Figure 2 A schematic diagram showing the main structure of an energy-saving air supply unit and a coating machine having the same according to an embodiment of the present application;

[0023] Figure 3 A top view of an energy saver of a coating machine with an energy-saving air supply unit according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0025] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] In addition, 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, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0028] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0029] like Figure 1 The energy-saving air supply unit 1 shown includes: a chassis shell, an economizer 201, an evaporator 103, a condenser 104 and a steam section 108.

[0030] The economizer 201, the evaporator 103, the condenser 104 and the steam section 108 are all arranged in the chassis shell; the economizer 201 is arranged on both sides of the inlet and outlet ends of the evaporator 103, the part arranged on the side of the inlet end of the evaporator 103 is the front section of the economizer 201, and the part arranged on the side of the outlet end of the evaporator 103 is the rear section of the economizer 201. The front section of the economizer 201 is arranged close to the inlet end of the air supply unit 1, the condenser 104 is arranged on the rear side of the economizer 201, the steam section 108 is arranged on the rear side of the outlet end of the condenser 104, and the outlet end of the steam section 108 is arranged close to the outlet end of the air supply unit 1.

[0031] The "front" and "rear" mentioned in the present application refer to the flow direction of air in the air supply unit 1, the end close to the air inlet is the front end of the air flow, and the end close to the air outlet is the rear end of the air flow.

[0032] In summer, outdoor hot and humid air enters the air supply unit 1 through the air inlet, first passes through the first-stage filter 101 and then enters the front section of the economizer 201. At this time, the front section of the economizer 201 absorbs heat energy in the air, causing the medium in the economizer 201 (the working fluid in the economizer 201 includes but is not limited to R410a) to absorb heat and vaporize, thereby generating a pressure difference in the pipeline of the economizer 201. The gaseous refrigerant in the pipe flows to the rear end of the economizer 201. After passing through the front section of the economizer 201, the air is cooled by the refrigerant after absorbing heat, thereby achieving a pre-cooling effect.

[0033] Then the air enters the evaporator 103, where the air is cooled and dehumidified. After reaching the required humidity requirement, the air enters the latter section of the economizer 201.

[0034] Since a part of the heat has been transferred to the latter section in the former section of the economizer 201, the working fluid in the economizer 201 releases heat to the air and then condenses into a liquid state. The liquid working fluid returns to the former section again in the pipeline and exchanges heat with the air in the former section to vaporize, and this cycle repeats.

[0035] The air passing through the latter section of the economizer 201 will exchange heat with the working fluid in the economizer 201 to achieve the preheating effect. The preheated air enters the condenser 104, and at this time, the condenser 104 heats the air again.

[0036] The heat source of the condenser 104 comes from the heat recovery of the heat generated during the treatment of the air in the evaporator 103. The evaporator 103 absorbs the heat in the air and deeply cools and dehumidifies the air. After that, the refrigerant in the evaporator 103 absorbs heat and evaporates into a gaseous state and then enters the compressor 110. The compressor 110 changes the low-temperature and low-pressure refrigerant into a high-temperature and high-pressure refrigerant. The refrigerant releases heat to the air in the condenser 104 to heat the air. After that, the refrigerant enters the throttle expansion valve, cools down and reduces pressure, and then becomes a two-phase medium and re-enters the evaporator 103 to cycle repeatedly.

[0037] The air reaches the maintenance section 105 after being treated by the condenser 104, flows through the air holes above the maintenance section 105 to the flow equalization section, so that the air reaches a stable air flow organization, and is sent out by the main fan 5. The air is heated to the high temperature required for coating by steam heating in the steam section 108, and finally is sent to the coating machine through the secondary filter 109.

[0038] In a possible implementation manner, the top view of the economizer 201 is a "U" - shaped structure. The inside of the economizer 201 is connected and set. The two longitudinal sides of the economizer 201 are respectively the former section and the latter section of the economizer 201. A connecting section of the economizer 201 is arranged between the former section and the latter section of the economizer 201; the evaporator 103 is arranged between the former section and the latter section of the economizer 201, and the inlet end of the evaporator 103 is arranged close to the former section of the economizer 201, and the outlet end of the evaporator 103 is arranged close to the latter section of the economizer 201. Only by inserting the economizer 201 before and after the evaporator 103, energy conservation can be achieved relying on the physical phase change process, and the environmental protection performance is strong.

[0039] In one possible implementation, it also includes: a primary filter 101, an inspection section 105, a uniform flow section 106, a blower 107 and a secondary filter 109; the primary filter 101, the front section of the economizer 201, the evaporator 103, the rear section of the economizer 201, the condenser 104, the inspection section 105, the uniform flow section 106, the blower 107, the steam section 108 and the secondary filter 109 are sequentially arranged in the chassis shell; wherein, the primary filter 101 is arranged at one end close to the air inlet of the chassis shell, and the secondary filter 109 is arranged at one end close to the air outlet of the chassis shell.

[0040] The air supply unit 1 may also be equipped with any form of functional components according to user needs, such as an ultraviolet light sterilization section, a wet film humidification section, a hot water heating section, or any other air heat and moisture treatment functional section.

[0041] In one possible implementation, the chassis shell is a double-layer box structure, the air inlet of the air supply unit 1 is set on the bottom layer of the chassis shell, the air outlet of the air supply unit 1 is set on the top layer of the chassis shell, and the bottom layer and the top layer of the chassis shell are connected.

[0042] In one possible implementation, it also includes: a primary filter 101, a maintenance section 105, a uniform flow section 106, a blower 107 and a secondary filter 109; the primary filter 101, the front section of the economizer 201, the evaporator 103, the rear section of the economizer 201, the condenser 104 and the maintenance section 105 are sequentially arranged in the bottom layer of the chassis shell, and the primary filter 101 is arranged on the side close to the air inlet; the uniform flow section 106, the blower 107, the steam section 108 and the secondary filter 109 are sequentially arranged in the top layer of the chassis shell, and the secondary filter 109 is arranged on the side close to the air outlet; the maintenance section 105 is arranged at the bottom of the uniform flow section 106, and the maintenance section 105 and the uniform flow section 106 are connected.

[0043] In one possible implementation, it also includes: a compressor 110 and a throttling expansion valve; a pipeline connection between the evaporator 103 and the condenser 104, and a loop connection between the evaporator 103 and the condenser 104; a pipeline connection between the evaporator 103 and the inlet end of the compressor 110, a pipeline connection between the outlet end of the compressor 110 and the condenser 104, a pipeline connection between the condenser 104 and the inlet end of the throttling expansion valve, and a pipeline connection between the outlet end of the throttling expansion valve and the evaporator 103.

[0044] The compressor 110 described in the present application includes but is not limited to a scroll compressor 110 , and the evaporator 103 and the condenser 104 include but are not limited to shell and tube type and plate type heat exchangers.

[0045] In one possible implementation, the energy saver 201 is provided with fastening bolts 1021 and washers 1022; a plurality of fastening bolts 1021 are provided on the front section of the energy saver 201, the rear section of the energy saver 201 and the connecting section of the energy saver 201, and the fastening bolts 1021 fix the energy saver 201 in the chassis shell; a plurality of washers 1022 are provided on the front section of the energy saver 201, the rear section of the energy saver 201 and the connecting section thereof.

[0046] In addition to being applied to newly built air supply units 1, the energy saver 201 can also be widely used in renovation projects. According to the on-site conditions of the already installed and fixed equipment, the energy saver 201 of the present application can be modified and installed with energy savers 201 for different product sizes, which will neither destroy the shape and function of the original equipment nor affect the operation mode of the original equipment. The modification method is simple and can be applied to a high degree of implementation. The product will be produced according to several common models on the market, and a model slightly smaller than the box size will be selected on site for installation. As shown in the figure, the top view of the installation and fixing method of the energy saver 201 in the box, the energy saver 201 is provided with multiple groups of fastening bolts 1021 along the setting direction of the pipeline, each group of fastening bolts 1021 is two, and a group of washers 1022 are provided on both sides of the bolts. The height of the washers 1022 can be used to fine-tune the height difference between the energy saver 201 and the box, and to level and align the energy saver 201.

[0047] In a possible implementation, the thickness of the front section of the economizer 201 is equal to the thickness of the rear section of the economizer 201 .

[0048] like Figure 2 A coating machine is shown, comprising: a liquid supply system 2, a main machine 3, a dust collector 4, a main fan 5 and the above-mentioned energy-saving air supply unit 1; the outlet end of the air supply unit 1 is connected to the main machine 3 by a pipeline, the liquid supply system 2 is arranged beside the main machine 3 and is connected to the main machine 3, the outlet end of the main machine 3 is connected to the inlet end of the dust collector 4 by a pipeline, the outlet end of the dust collector 4 is connected to the main fan 5 by a pipeline, and the main fan 5 is suitable for being connected to the outside of the device.

[0049] For the 150 model coating machine, the air supply unit 1 is connected as follows: the outlet end of the air supply unit 1 is provided with an air duct reducer connected to the air duct, and the air duct delivers hot air from the top of the main machine 3 to the coating machine. The top of the coating machine is a circular air duct interface, so a round and square interface is provided at the connection between the coating machine and the air duct to connect the air duct and the coating.

[0050] The energy-saving air supply unit 1 described in the present application can be applied not only to coating machine systems, but also to other (pharmaceutical) equipment such as fluidized beds that require pretreatment of fresh air according to actual needs.

[0051] In a possible implementation, a regulating valve is provided on the pipeline between the coating machine and the air supply unit 1, and the regulating valve is provided on a side close to the coating machine.

[0052] Taking Beijing as an example, the hot air flow of the conventional 150-type coating machine air supply unit 1 is as follows: the outdoor fresh air at 35°C enters the air supply unit 1, is cooled and dehumidified by the surface cooler to 18°C, and then is heated by steam to 80°C.

[0053] The working process of the air supply unit 1 described in the present application is as follows: after the outdoor fresh air at 35°C enters the air supply cabinet, it is reduced to 28°C through the front section of the economizer 102, and then reduced to 18°C ​​after cooling and dehumidification through the evaporator 103, and then preheated to 25°C through the rear section of the economizer 102, and then heated to 50°C by the compressor 110 system, and finally raised to 80°C through the steam heating section.

[0054] It can be seen that after precooling and preheating by the economizer 102, the evaporator 103 only needs to cool the air at 28°C to 18°C, instead of cooling and dehumidifying from 35°C to 18°C ​​in the normal mode. The same is true for steam heating, and the steam consumption also decreases with the addition of preheating. Therefore, the economizer 102 not only reduces the energy consumption on the cold side, but also reduces the gas consumption on the steam heating side, which is energy-saving and environmentally friendly, and reduces energy consumption.

[0055] It should be noted that although this application is used as an example to introduce an energy-saving air supply unit and a coating machine having the same, those skilled in the art will understand that this application should not be limited thereto. In fact, users can flexibly set various parameters according to personal preferences and / or actual application scenarios, as long as the design is reasonable.

[0056] In this way, an economizer, an evaporator, a condenser and a steam section are arranged in the chassis shell of the air supply unit. In summer, the hot and humid air outdoors enters through the front section of the economizer. At this time, after the front section of the economizer is heated, the medium inside absorbs heat and vaporizes, generating a pressure difference inside the economizer and flowing to the rear section of the economizer. At this time, the air entering from the outdoors is cooled after absorbing heat to achieve a pre-cooling effect. Then the air enters the evaporator for cooling and dehumidification. After reaching the required humidity requirement, it passes through the rear section of the economizer. Since the front section of the economizer has transferred part of the heat to the rear section, the working fluid in the economizer releases heat and condenses into liquid at this time. The liquid working fluid returns to the front section in the pipeline to be heated and vaporized again. This reciprocating cycle will preheat the air passing through the rear section of the economizer, and the preheated air enters the condenser for heating, and then flows into the steam section to be heated to the high temperature required for coating by steam and sent to the subsequent processing device.

[0057] The air supply unit can be used to process the outdoor air input to the coating machine. The outdoor fresh air is cooled, dehumidified and heated by the air supply unit before entering the main unit through the air duct and cooperating with the liquid supply system to coat the drugs. It is then discharged outside the device after being processed by the dust collector and the main fan.

[0058] According to an energy-saving air supply unit and a coating machine having the same, the energy utilization rate of the entire device can be increased by recycling and reusing thermal energy, and the treated outdoor air can be transmitted to subsequent devices, making full use of the heat absorbed from the air in the surface cooling and dehumidification stage, and using the heat to perform two-stage preheating of the air passing through the rear section of the economizer and the condenser, which can effectively reduce the amount of steam required for the subsequent steam section and reduce the energy consumption of the boiler to generate steam.

[0059] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An energy-saving air supply unit, characterized in that: Including: Cabinet shell, energy saver, evaporator, condenser and steam section; The energy saver, the evaporator, the condenser and the steam section are all arranged inside the cabinet shell; The energy saver surrounds both sides of the inlet end and the outlet end of the evaporator. The front section of the energy saver is arranged on one side of the inlet end of the evaporator, and the rear section of the energy saver is arranged on one side of the outlet end of the evaporator. The front section of the energy saver is arranged close to the inlet end of the air supply unit. The condenser is arranged at the rear side of the energy saver. The steam section is arranged at the rear side of the outlet end of the condenser. The outlet end of the steam section is arranged close to the outlet end of the air supply unit.

2. The energy-saving air supply unit according to claim 1, characterized in that: The top view of the energy saver is a "凵"-shaped structure. The inside of the energy saver is connected. The two longitudinal sides of the energy saver are respectively the front section and the rear section of the energy saver. A connecting section of the energy saver is arranged between the front section and the rear section of the energy saver; The evaporator is arranged between the front section and the rear section of the energy saver, and the inlet end of the evaporator is arranged close to the front section of the energy saver, and the outlet end of the evaporator is arranged close to the rear section of the energy saver.

3. The energy-saving air supply unit according to any one of claims 1 to 2, characterized in that: Also including: Primary filter, maintenance section, uniform flow section, air supply fan and secondary filter; The primary filter, the front section of the energy saver, the evaporator, the rear section of the energy saver, the condenser, the maintenance section, the uniform flow section, the air supply fan, the steam section and the secondary filter are sequentially arranged inside the cabinet shell; Wherein, the primary filter is arranged at one end close to the air inlet of the cabinet shell, and the secondary filter is arranged at one end close to the air outlet of the cabinet shell.

4. The energy-saving air supply unit according to any one of claims 1 to 2, characterized in that: The cabinet shell is a double-layer box structure up and down. The air inlet of the air supply unit is arranged at the bottom layer of the cabinet shell, and the air outlet of the air supply unit is arranged at the top layer of the cabinet shell. There is a connection between the bottom layer and the top layer of the cabinet shell.

5. The energy-saving air supply unit according to claim 4, characterized in that: Also including: Primary filter, maintenance section, uniform flow section, air supply fan and secondary filter; The primary filter, the front section of the energy saver, the evaporator, the rear section of the energy saver, the condenser and the maintenance section are sequentially arranged inside the bottom layer of the cabinet shell, and the primary filter is arranged on the side close to the air inlet; The uniform flow section, the air supply fan, the steam section and the secondary filter are sequentially arranged inside the top layer of the cabinet shell, and the secondary filter is arranged on the side close to the air outlet; The maintenance section is arranged at the bottom of the uniform flow section, and there is a connection between the maintenance section and the uniform flow section.

6. The energy-saving air supply unit according to claim 5, characterized in that: Also including: Compressor and throttling expansion valve; The evaporator and the condenser are connected by pipelines and are connected in a loop; There is a pipeline connection between the evaporator and the inlet end of the compressor, a pipeline connection between the outlet end of the compressor and the condenser, a pipeline connection between the condenser and the inlet end of the throttling expansion valve, and a pipeline connection between the outlet end of the throttling expansion valve and the evaporator.

7. The energy-saving air supply unit according to claim 2, characterized in that: Fastening bolts and sole plates are arranged on the energy saver; The fastening bolts are provided in plurality on the front section of the economizer, the rear section of the economizer and the connecting section of the economizer, and the economizer is fixedly arranged in the chassis housing by the fastening bolts; A plurality of the shims are arranged on the front section of the economizer, the rear section of the economizer and the connecting section thereof.

8. The energy-saving air supply unit according to claim 2, characterized in that: The thickness of the front section of the economizer is equal to the thickness of the rear section of the economizer.

9. A coating machine, characterized in that: include: A liquid supply system, a main machine, a dust collector, a main fan, and an energy-saving air supply unit according to any one of claims 1 to 8; The outlet end of the air supply group is connected to the main unit by a pipeline, the liquid supply system is arranged beside the main unit and is connected to the main unit, the outlet end of the main unit is connected to the inlet end of the dust collector by a pipeline, the outlet end of the dust collector is connected to the main fan by a pipeline, and the main fan is suitable for being connected to the outside of the device.

10. The coating machine according to claim 9, characterized in that: A regulating valve is arranged on the pipeline between the coating machine and the air supply unit, and the regulating valve is arranged on a side close to the coating machine.

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