CN212320264U

CN212320264U - High-efficient multistage drying system

Info

Publication number: CN212320264U
Application number: CN202022019807.3U
Authority: CN
Inventors: 张勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2021-01-08
Anticipated expiration: 2030-09-15

Abstract

The embodiment of the utility model provides a high-efficient multistage drying system relates to heat pump stoving field. The efficient multistage drying system comprises a first drying area, a second drying area, a first air duct, a second air duct, a compressor, a throttling device, a first heat exchanger, a second heat exchanger, a first heat exchange assembly, a first fan and a second fan. First air flows through the first air channel, and the first fan is used for enabling the first air to flow from the first drying area, sequentially flow through the first heat exchange surface of the first heat exchange assembly and the first heat exchanger along the first air channel, and then flow into the first drying area; second air flows in the second air channel, and the second fan is used for enabling the second air to flow from the second drying area, sequentially flow through the second heat exchanger and the second heat exchange surface of the first heat exchange assembly along the second air channel and then flow into the second drying area. The embodiment of the utility model provides a can promote the efficiency that the heat pump was dried.

Description

High-efficient multistage drying system

Technical Field

The utility model relates to a heat pump stoving field particularly, relates to a high-efficient multistage drying system.

Background

In order to continuously improve the heat pump drying energy efficiency, the conventional technology is usually optimized and improved on a single heat pump drying unit, and the heat pump drying energy efficiency is improved by adjusting the system design, the heat exchanger design, the control, the air path design and other modes; however, this technique has a limited range of improvement in heat pump drying energy efficiency.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high-efficient multistage drying system, its efficiency that can promote the heat pump and dry.

The embodiment of the utility model provides a high-efficient multistage drying system, including first stoving region, second stoving region, first wind channel, second wind channel, compressor, throttling arrangement, first heat exchanger, second heat exchanger, first heat transfer subassembly, first fan and second fan; an exhaust port of the compressor is connected with an inlet of the first heat exchanger, an outlet of the first heat exchanger is connected with an inlet of the throttling device, an outlet of the throttling device is connected with an inlet of the second heat exchanger, an outlet of the second heat exchanger is connected with an air suction port of the compressor, and the compressor, the first heat exchanger, the second heat exchanger and the throttling device are used for allowing a refrigerant to circularly flow; the first drying area and the second drying area are used for drying objects to be dried, and the temperature of the first drying area is higher than that of the second drying area; the first heat exchange assembly is provided with a first heat exchange surface and a second heat exchange surface, the first heat exchange surface and the second heat exchange surface can exchange heat for gas flowing through the first heat exchange surface, and the gas flowing through the first heat exchange surface is not contacted with the gas flowing through the second heat exchange surface; the inlet and outlet ends of the first air duct are respectively communicated with the first drying area, first air flows through the first air duct, and the first fan is used for enabling the first air to flow from the first drying area, sequentially pass through the first heat exchange surface of the first heat exchange assembly and the first heat exchanger along the first air duct, then flow into the first drying area, and circulate in the first drying area; and the inlet and outlet ends of the second air duct are respectively communicated with the second drying area, second air flows in the second air duct, and the second fan is used for enabling the second air to flow from the second drying area, sequentially flow through the second heat exchanger and the second heat exchange surface of the first heat exchange assembly along the second air duct, then flow into the second drying area, and circulate in the second drying area.

In an optional implementation manner, the efficient multi-stage drying system further includes a first water pan and a first water pipe, the first water pan is disposed below the second heat exchanger, and the first water pipe is connected to the first water pan and is configured to guide water in the first water pan to a region outside the first drying region, the second drying region, the first air duct, and the second air duct.

In an optional embodiment, the high-efficiency multi-stage drying system further includes a second water pipe, and the second water pipe is configured to guide the condensed water generated by the first heat exchange assembly to a region outside the first drying region, the second drying region, the first air duct, and the second air duct.

In an alternative embodiment, the first air duct is provided with a first bypass duct communicating upstream and downstream of the first heat exchange surface of the first heat exchange assembly; and/or the second air duct is provided with a second bypass air duct which is communicated with the upstream and the downstream of the second heat exchanger.

In an optional embodiment, the high-efficiency multi-stage drying system further includes a third heat exchanger, the third heat exchanger is located in the second air duct upstream of the second heat exchanger, and the second fan is configured to make the second air flow out of the second drying region along the second air duct, and flow into the second drying region along the third heat exchanger, the second heat exchanger, and the second heat exchange surface of the first heat exchange assembly in sequence.

In an optional implementation manner, the efficient multistage drying system further includes a first water pan and a first water pipe, the first water pan is disposed below the second heat exchanger, one end of the first water pipe is connected to the first water pan, and the other end of the first water pipe is connected to an inlet of the third heat exchanger, and is used for guiding water in the first water pan to the third heat exchanger.

In an optional embodiment, the high-efficiency multi-stage drying system further includes a fourth heat exchanger, the fourth heat exchanger is located in the first air duct upstream of the first heat exchange surface of the first heat exchange assembly, and the first fan is configured to make the first gas flow out of the first drying region along the first air duct, sequentially flow through the fourth heat exchanger, the first heat exchange surface of the first heat exchange assembly, and the first heat exchanger, then flow into the first drying region, and circulate therewith.

In an optional embodiment, the high-efficiency multi-stage drying system further comprises a second water pipe, the second water pipe is used for guiding the condensed water generated by the first heat exchange surface of the first heat exchange assembly to the fourth heat exchanger, and an outlet of the fourth heat exchanger is connected to a drying area and an area outside the air duct.

In an optional implementation manner, the efficient multistage drying system further includes a first water pan and a first water pipe, the first water pan is disposed below the second heat exchanger, one end of the first water pipe is connected to the first water pan, the other end of the first water pipe is connected to an inlet of the fourth heat exchanger, the first water pan is used for guiding water in the first water pan to the fourth heat exchanger, and an outlet of the fourth heat exchanger is connected to all drying areas and areas other than the air duct.

In an optional embodiment, the high efficiency multi-stage drying system further comprises a second heat exchange assembly having a third heat exchange surface and a fourth heat exchange surface, the third heat exchange surface and the fourth heat exchange surface being capable of exchanging heat for the gas flowing through each, and the gas flowing through the third heat exchange surface is not in contact with the gas flowing through the fourth heat exchange surface; the third heat exchange surface of the second heat exchange assembly is located downstream of the first heat exchange surface of the first heat exchange assembly in the first air duct, and the first fan is configured to enable the first gas to start from the first drying area, sequentially pass through the first heat exchange surface of the first heat exchange assembly, the third heat exchange surface of the second heat exchange assembly, the first heat exchanger along the first air duct, and return to the first drying area; the fourth heat exchange surface of the second heat exchange assembly is located at the upstream of the second heat exchanger in the second air duct, and the second fan is configured to enable the second air to flow from the second drying area, sequentially through the fourth heat exchange surface of the second heat exchange assembly, the second heat exchanger, and the second heat exchange surface of the first heat exchange assembly, and return to the second drying area.

In an alternative embodiment, the first heat exchange assembly includes a first channel and a second channel which are not communicated, a heat transfer medium is disposed between the first channel and the second channel, the first channel forms the first heat exchange surface, and the second channel forms the second heat exchange surface; or the first heat exchange assembly comprises a first sub heat exchanger and a second sub heat exchanger, the second sub heat exchanger is higher than the first sub heat exchanger, the first sub heat exchanger and the second sub heat exchanger are connected to form a closed cavity, the cavity is used for accommodating a refrigerant, the outer surface of the first sub heat exchanger is the first heat exchange surface, and the outer surface of the second sub heat exchanger is the second heat exchange surface; or, the first heat exchange assembly comprises a first sub heat exchanger, a second sub heat exchanger and a water pump, the first sub heat exchanger and the second sub heat exchanger are connected through a pipeline and form a closed circulation system, a medium flows in the closed circulation system, the water pump is arranged in the closed circulation system and is used for enabling the medium to circularly flow in the system, the surface of the first sub heat exchanger is the first heat exchange surface, and the outer surface of the second sub heat exchanger is the second heat exchange surface.

The embodiment of the utility model provides a high-efficient multistage drying system, including first stoving region, second stoving region, first wind channel, second wind channel, compressor, first heat transfer subassembly, throttling arrangement, first heat exchanger, second heat exchanger, first fan, second fan, wind channel in the middle of 1 ~ N, 1 ~ N middle stoving region, 1 ~ N middle heat transfer subassembly, 1 ~ N middle fan, wherein, N is the positive integer that is greater than or equal to 1; an exhaust port of the compressor is connected with an inlet of the first heat exchanger, an outlet of the first heat exchanger is connected with an inlet of the throttling device, an outlet of the throttling device is connected with an inlet of the second heat exchanger, an outlet of the second heat exchanger is connected with an air suction port of the compressor, and the compressor, the first heat exchanger, the second heat exchanger and the throttling device are used for allowing a refrigerant to circularly flow; the first drying area, the second drying area and the 1 st to Nth middle drying areas are all used for drying objects to be dried, the temperature of the first drying area is higher than that of the second drying area, the temperature of the 1 st to Nth middle drying areas is lower than that of the first drying area and higher than that of the second drying area, when N is larger than or equal to 2, the temperature of the kth middle drying area is lower than that of the k-1 th middle drying area, k is a positive integer, and the value of k ranges from 2 to N; the first heat exchange assembly is provided with a first heat exchange surface and a second heat exchange surface, the first heat exchange surface and the second heat exchange surface can exchange heat for gas flowing through the first heat exchange surface, and the gas flowing through the first heat exchange surface is not contacted with the gas flowing through the second heat exchange surface; the 1 st to N th intermediate heat exchange assemblies are provided with a first intermediate heat exchange surface and a second intermediate heat exchange surface, the first intermediate heat exchange surface and the second intermediate heat exchange surface can exchange heat for respective gas, and the gas flowing through the first intermediate heat exchange surface is not contacted with the gas flowing through the second intermediate heat exchange surface; when N ═ 1: the 1 st to Nth intermediate drying areas are first intermediate drying areas, the 1 st to Nth intermediate heat exchange assemblies are first intermediate heat exchange assemblies, the 1 st to Nth intermediate air ducts are first intermediate air ducts, and the 1 st to Nth intermediate fans are first intermediate fans; the two ends of the first air duct are respectively communicated with the first drying area, and the first fan enables the air in the first drying area to flow from the first drying area, sequentially pass through the first intermediate heat exchange surface of the first intermediate heat exchange assembly and the first heat exchanger along the first air duct, then flow into the first drying area, and circulate in the first drying area; the two ends of the second air duct are respectively communicated with the second drying area, and the second fan enables the air in the second drying area to flow from the second drying area, sequentially pass through the second heat exchanger and the second heat exchange surface of the first heat exchange assembly along the second air duct, then flow into the second drying area, and circulate in the second drying area; the two ends of the first intermediate air duct are respectively communicated with the first intermediate drying area, and the first intermediate fan is used for enabling the air in the first intermediate drying area to sequentially flow through the first heat exchange surface of the first heat exchange assembly and the second intermediate heat exchange surface of the first intermediate heat exchange assembly along the first intermediate air duct, then flow into the first intermediate drying area, and circulate in the first intermediate drying area; when N is more than or equal to 2: the 1 st to N middle drying areas comprise an ith middle drying area, the 1 st to N middle heat exchange assemblies comprise ith middle heat exchange assemblies, the 1 st to N middle air channels comprise ith middle air channels, the 1 st to N middle fans comprise ith middle fans, wherein i is more than or equal to 1 and is less than or equal to N-1; the two ends of the first air duct are respectively communicated with the first drying area, and the first fan is used for enabling the first gas to flow from the first drying area, sequentially pass through the first intermediate heat exchange surface of the first intermediate heat exchange assembly and the first heat exchanger along the first air duct, then flow into the first drying area, and circulate in the first drying area; the two ends of the second air duct are respectively communicated with the second drying area, and the second fan is used for enabling the second air to flow from the second drying area, sequentially pass through the second heat exchanger and the second heat exchange surface of the first heat exchange assembly along the second air duct, then flow into the second drying area, and circulate in the second drying area; the two ends of the ith intermediate air duct are respectively communicated with the ith intermediate drying area, and the ith intermediate fan is used for enabling air in the ith intermediate drying area to sequentially flow through the first intermediate heat exchange surface of the (i + 1) th intermediate heat exchange assembly and the second intermediate heat exchange surface of the ith intermediate heat exchange assembly along the ith intermediate air duct, then flow into the ith intermediate drying area and circulate in the same way; the two ends of the Nth intermediate air duct are respectively communicated with the Nth intermediate drying area, and the Nth intermediate fan is used for enabling the air in the Nth intermediate drying area to sequentially flow through the first heat exchange surface of the first heat exchange assembly and the second intermediate heat exchange surface of the Nth intermediate heat exchange assembly along the Nth intermediate air duct, then flow into the first intermediate drying area, and circulate in the manner.

In an optional embodiment, the high-efficiency multistage drying system further comprises at least one pre-cooling heat exchanger, an inlet of the pre-cooling heat exchanger is used for flowing a cooling medium, an outlet of the pre-cooling heat exchanger is used for guiding the cooling medium to the outside of the drying area and the air duct, and the cooling medium is used for exchanging heat with the air; the pre-cooling heat exchanger is located upstream of a first intermediate heat exchange surface of the first intermediate heat exchange assembly in the first air duct; and/or the pre-cooling heat exchanger is located upstream of the second heat exchanger in the second air duct; and/or the precooling heat exchanger is positioned in at least one of the 1 st to N-1 th intermediate air ducts and is positioned at the upstream of the first intermediate heat exchange surface of the corresponding 2 nd to N th intermediate heat exchange assembly; and/or the pre-cooling heat exchanger is located upstream of the first intermediate heat exchange surface of the first intermediate heat exchange assembly in the nth intermediate air duct.

In an alternative embodiment, the high efficiency multi-stage drying system further comprises at least one drain pipe; the at least one precooling heat exchanger comprises an m-th intermediate precooling heat exchanger, when m is equal to 1, the m-th intermediate precooling heat exchanger is a first intermediate precooling heat exchanger, and the first intermediate precooling heat exchanger is positioned on the upstream of a first intermediate heat exchange surface of the first intermediate heat exchange assembly in the first air duct; when m is larger than or equal to 2, the mth intermediate precooling heat exchanger is positioned at the upstream of the first intermediate heat exchange surface of the mth intermediate heat exchange assembly in the mth-1 intermediate air duct; the at least one drain pipe comprises a jth intermediate drain pipe, the jth intermediate drain pipe is communicated with a first intermediate heat exchange surface water path of a jth intermediate heat exchange assembly, the jth intermediate drain pipe is connected with an inlet of the mth intermediate precooling heat exchanger and is used for draining condensed water to the mth intermediate precooling heat exchanger, wherein m and j are positive integers, and m is greater than or equal to 1 and is less than or equal to j and is less than or equal to N; and/or the efficient multistage drying system further comprises a water pan, the water pan is arranged below the second heat exchanger, and the at least one drain pipe comprises a first drain pipe which is respectively connected with the water pan and inlets of the precooling heat exchangers and is used for guiding the condensed water generated by the second heat exchanger to any one of the precooling heat exchangers; and/or, at least one drain pipe includes the second drain pipe, the second drain pipe with first heat transfer subassembly water route intercommunication, and with first heat transfer subassembly corresponds, be located in the precooling heat exchanger in the wind channel in the middle of the Nth or the access connection of precooling heat exchanger in the middle of the mth, be used for with the comdenstion water drainage that first heat transfer subassembly produced to with first heat transfer subassembly corresponds the precooling heat exchanger.

The embodiment of the utility model provides a beneficial effect is: under the conventional condition, the heat pump drying unit provides cold quantity Q and consumed power P, and the corresponding cold quantity Q can be the condensation of moisture in the gas in the dried area, so that the total energy efficiency can be evaluated and calculated by using Q/P or water yield/consumed power. In the scheme, the refrigeration capacity Q is provided in the corresponding refrigeration cycle, namely, the refrigeration capacity for processing the second gas is Q, the refrigeration capacity Q can be provided for the first gas through the heat exchange between the first gas and the second gas, the power consumption of the fan caused by the heat exchange between the first gas and the second gas in the scheme is increased, the power consumption increase is calculated to be P1, then, the energy efficiency of the scheme is 2Q/(P + P1), and P is larger than P1 under the general condition, in the practical reference, P can be larger than 3 times P1, even, P can be larger than 10 times P1, then, the energy efficiency of the scheme is larger than 1.5Q/P, and is improved by more than 50% compared with the energy efficiency of the conventional scheme. And in the utility model discloses an in another form, dry in the scheme in region and middle fan, middle heat exchange assemblies and middle wind channel in the middle of including promptly, owing to adopt more middle stoving region, the efficiency of holistic stoving so improves more. The embodiment of the utility model provides a more high-efficient, more energy-conserving heat pump drying system is provided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a high-efficiency multi-stage drying system provided by an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of the efficient multi-stage drying system of FIG. 1 including a first bypass air duct and a second bypass air duct;

FIG. 3 is a schematic diagram of the high-efficiency multi-stage drying system of FIG. 1 including a third heat exchanger;

FIG. 4 is a schematic diagram of the high-efficiency multi-stage drying system of FIG. 1 including a fourth heat exchanger;

FIG. 5 is a schematic diagram of the high-efficiency multi-stage drying system of FIG. 1 including a third heat exchanger and a fourth heat exchanger;

FIG. 6 is a schematic structural diagram of the high-efficiency multi-stage drying system of FIG. 1 including a second heat exchange assembly;

FIG. 7 is a schematic view of a first possible construction of the first heat exchange assembly of FIG. 1;

FIG. 8 is a schematic view of a second possible construction of the first heat exchange assembly of FIG. 1;

FIG. 9 is a schematic view of a third possible construction of the first heat exchange assembly of FIG. 1;

fig. 10 is a schematic structural view of the high-efficiency multi-stage drying system provided by the embodiment of the present invention including a first intermediate drying region;

fig. 11 is a schematic structural view of a high-efficiency multi-stage drying system provided by an embodiment of the present invention including two intermediate drying areas;

FIG. 12 is a schematic diagram of the arrangement of FIG. 10 including an intermediate pre-cooling heat exchanger;

FIG. 13 is another schematic block diagram of FIG. 12 including an intermediate pre-cooling heat exchanger;

fig. 14 is a schematic diagram of the arrangement of fig. 10 including a pre-cooling heat exchanger.

Icon: 100-high-efficiency multi-stage drying system; 101-a first drying area; 102-a second drying area; 103-a first air duct; 104-a second air duct; 105-a compressor; 106-a throttling device; 107-a first heat exchanger; 108-a second heat exchanger; 109-a first heat exchange assembly; 1091-a first sub-heat exchanger; 1092-a second sub-heat exchanger; 1093-Water Pump; 110-a first fan; 111-a second fan; 112-a first drip tray; 113-a first water pipe; 114-a second water pipe; 115-a first bypass air duct; 116-a second bypass duct; 117-third heat exchanger; 118-a fourth heat exchanger; 119-a second heat exchange assembly; 120-a first intermediate drying zone; 121-a first intermediate heat exchange assembly; 122-a first intermediate air duct; 123-a first intermediate fan; 124-a second intermediate drying zone; 125-a second intermediate heat exchange assembly; 126-a second intermediate air duct; 127-a second intermediate blower; 128-a first intermediate pre-cooling heat exchanger; 129-a first intermediate drain; 130-a second intermediate pre-cooling heat exchanger; 131-a second intermediate drain; 132-a first drain pipe; 133-a water pan; 134-second drain.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, an embodiment of the present invention provides a high-efficiency multi-stage drying system 100. The high-efficiency multi-stage drying system 100 has the effects of being more efficient and more energy-saving than the conventional scheme. The embodiment of the utility model provides a high-efficient multistage drying system 100, the multistage heat transfer of make full use of can use the compressor 105 circulation still less, reaches more refrigerating output, heating capacity on the whole, realizes consuming still less power, producing more cold volumes, the purpose of discharging more moisture, reaches that whole drying system has higher efficiency.

The embodiment of the present invention provides an efficient multi-stage drying system 100, which comprises a first drying region 101, a second drying region 102, a first air duct 103, a second air duct 104, a compressor 105, a throttling device 106, a first heat exchanger 107, a second heat exchanger 108, a first heat exchange assembly 109, a first fan 110 and a second fan 111.

The air outlet of the compressor 105 is connected with the inlet of the first heat exchanger 107, the outlet of the first heat exchanger 107 is connected with the inlet of the throttling device 106, the outlet of the throttling device 106 is connected with the inlet of the second heat exchanger 108, the outlet of the second heat exchanger 108 is connected with the air suction port of the compressor 105, and the compressor 105, the first heat exchanger 107, the second heat exchanger 108 and the throttling device 106 are used for allowing a refrigerant to circularly flow; first drying area 101 and second drying area 102 are both used for drying the objects to be dried, and the temperature of first drying area 101 is greater than the temperature of second drying area 102.

In the embodiment of the present invention, the first heat exchange assembly 109 has a first heat exchange surface and a second heat exchange surface, the first heat exchange surface and the second heat exchange surface can exchange heat for the gas flowing through each, and the gas flowing through the first heat exchange surface is not in contact with the gas flowing through the second heat exchange surface;

in the embodiment of the present invention, the inlet and outlet ends of the first air duct 103 are respectively communicated with the first drying area 101, the first air duct 103 is internally circulated with the first air, and the first fan 110 is used for making the first air flow from the first drying area 101, sequentially flow through the first heat exchange surface of the first heat exchange assembly 109 and the first heat exchanger 107 along the first air duct 103, and then flow into the first drying area 101; the inlet and outlet ends of the second air duct 104 are respectively communicated with the second drying area 102, second air flows through the second air duct 104, and the second fan 111 is configured to enable the second air to flow from the second drying area 102, sequentially pass through the second heat exchanger 108 and the second heat exchange surface of the first heat exchange assembly 109 along the second air duct 104, and then flow into the second drying area 102.

Optionally, the first heat exchange surface of the first heat exchange assembly 109 and the first heat exchanger 107 are both disposed within the first air duct 103, or are used to form the first air duct 103; likewise, the second heat exchange surfaces of the second heat exchanger 108 and the first heat exchange assembly 109 are both disposed within the second air duct 104, or are used to form the second air duct 104. The first fan 110 may be located within the first air chute 103 and the second fan 111 may be located within the second air chute 104.

It should be noted that the embodiment of the present invention has the following working principle: the compression refrigeration cycle, provide cold volume Q through second heat exchanger 108, whole consumed power P, the second gas is cooled after passing through second heat exchanger 108, release heat energy Q, some moisture is condensed, discharge, the second gas is through first heat exchange assembly 109 and first gas heat transfer back, the second gas is heated, absorb heat Q, the first gas is cooled after this heat transfer process, release heat energy Q, some moisture is condensed, the second gas continues to flow into second stoving region 102 along second wind channel 104, the first gas continues to be heated after passing through first heat exchanger 107 along first wind channel 103, then flow into first stoving region 101, form the circulation. The first gas and the second gas are totally cooled in the treatment process, 2Q heat energy is released, the quantity of cold Q provided by the conventional compression refrigeration cycle is doubled, the power consumption increased in the process is very limited, only the power consumption for heat exchange of the first gas and the second gas is increased, and the power consumption is far less than the integral power consumption P. The embodiment of the utility model provides a more high-efficient, more energy-conserving heat pump drying system has been formed.

According to calculation, the high-efficiency multi-stage drying system 100 improves the energy efficiency by more than 50% compared with the conventional scheme. And (3) calculating:

under the conventional condition, the heat pump drying unit provides cold quantity Q and consumed power P, and the corresponding cold quantity Q can be the condensation of moisture in the gas in the dried area, so that the total energy efficiency can be evaluated and calculated by using Q/P or water yield/consumed power.

In the scheme, the refrigeration capacity Q is provided in the corresponding refrigeration cycle, that is, the refrigeration capacity for processing the second gas is Q, the refrigeration capacity Q can be provided for the first gas through the heat exchange between the first gas and the second gas, the power consumption of the fan caused by the heat exchange between the first gas and the second gas in the scheme is increased, the increase is P1, then, the energy efficiency of the scheme is 2Q/(P + P1), and P is greater than P1 in general, in actual reference, P can be greater than 3 times P1, even P can be greater than 10 times P1, then, the energy efficiency of the scheme is greater than 1.5Q/P, and is improved by more than 50% compared with the energy efficiency of the conventional scheme.

In an optional embodiment, the efficient multi-stage drying system 100 may further include a first water pan 112 and a first water pipe 113, the first water pan 112 is disposed below the second heat exchanger 108, and the first water pipe 113 is connected to the first water pan 112 and is configured to guide water in the first water pan 112 to a region outside the first drying region 101, the second drying region 102, the first air duct 103, and the second air duct 104.

In an optional embodiment, the high efficiency multi-stage drying system 100 may further include a second water pipe 114, where the second water pipe 114 is used to guide the condensed water generated by the first heat exchange assembly 109 to a region outside the first drying region 101, the second drying region 102, the first air duct 103, and the second air duct 104.

It should be understood that the first heat exchange surface of the first heat exchange assembly 109 may generate condensate water during the heat exchange process, and the second water pipe 114 may guide the condensate water to an area outside the air duct and the drying area. Alternatively, the second water pipe 114 may be connected to the first heat exchange surface of the first heat exchange assembly 109 to directly drain the condensed water; alternatively, the second water pipe 114 is connected to the air duct near the first heat exchange assembly 109, and the condensed water flows from the first heat exchange surface to the second water pipe 114 along the air duct.

Referring to fig. 2, in an alternative embodiment, the first air duct 103 is provided with a first bypass duct 115, the first bypass duct 115 communicating upstream and downstream of the first heat exchange surface; and/or the second air duct 104 is provided with a second bypass air duct 116, and the second bypass air duct 116 is communicated with the upstream and downstream of the second heat exchanger 108.

It should be noted that the first bypass duct 115 is used for adjusting the air volume flowing through the first heat exchanger 107, so as to achieve the purpose of improving the heat exchange efficiency of the first heat exchanger 107 and the purpose of reducing the condensation temperature of the compression refrigeration cycle, thereby reducing the power consumption and improving the energy efficiency; the second bypass air duct 116 is used for adjusting the air volume flowing through the second heat exchange surface of the first heat exchange assembly 109, so as to improve the heat exchange efficiency of the first heat exchange assembly 109, enable the heat exchange energy of the first gas and the second gas to reach the set heat exchange amount, and further control the temperature of the second gas after flowing through the second heat exchange surface of the first heat exchange assembly 109.

Optionally, air valves are arranged in the first bypass duct 115 and the second bypass duct 116 for adjusting air volumes of the first bypass duct 115 and the second bypass duct 116.

Referring to fig. 3, in an alternative embodiment, the efficient multi-stage drying system 100 further includes a third heat exchanger 117, the third heat exchanger 117 is located in the second air duct 104 upstream of the second heat exchanger 108, and the second fan 111 is configured to enable the second air to flow out of the second drying region 102 along the second air duct 104, and flow into the second drying region 102 along the third heat exchanger 117, the second heat exchanger 108, and the second heat exchange surface of the first heat exchange assembly 109 in sequence.

It should be understood that the third heat exchanger 117 can pre-cool the gas, and the amount of the second gas cooled by the second gas pre-cooled by the third heat exchanger 117 can be further increased, so as to achieve more condensation and drainage of the second gas. For the whole system, under some running conditions, because the heat quantity of the refrigeration cycle is greater than the cold quantity, and the states of the dried objects in the drying area have differences, the balance can be achieved only by supplementing a certain amount of cold quantity to the system, so that the required cold quantity is used for precooling the gas, and the purposes of moisture condensation and discharge of the gas when the cold quantity is utilized to a greater extent are achieved.

Further, the efficient multi-stage drying system 100 further includes a first water pan 112 and a first water pipe 113, the first water pan 112 is disposed below the second heat exchanger 108, one end of the first water pipe 113 is connected to the first water pan 112, and the other end of the first water pipe 113 is connected to an inlet of the third heat exchanger 117, so as to guide water in the first water pan 112 to the third heat exchanger 117.

Optionally, the condensed water in the first water pan 112 may be pumped into the third heat exchanger 117 by the water pump 1093; alternatively, the third heat exchanger 117 may be disposed below the first drip tray 112, and water may be directed to the third heat exchanger 117 by gravity. Of course, the cold source of the third heat exchanger 117 may also be derived from an external flowable medium, such as cooling water in a cooling tower.

Referring to fig. 4, in an alternative embodiment, the high-efficiency multi-stage drying system 100 further includes a fourth heat exchanger 118, the fourth heat exchanger 118 is located upstream of the first heat exchange surface of the first heat exchange assembly 109 in the first air duct 103, and the first fan 110 is configured to enable the first gas to flow out of the first drying region 101 along the first air duct 103, sequentially flow through the fourth heat exchanger 118, the first heat exchange surface of the first heat exchange assembly 109, and the first heat exchanger 107, and then flow into the first drying region 101, and circulate through the first heat exchanger 107.

It should be understood that the fourth heat exchanger 118 may pre-cool the first gas, and the amount of the first gas cooled by the first gas after pre-cooling by the fourth heat exchanger 118 may be further increased, so as to achieve more condensation and drainage of the first gas. For the whole system, under some running conditions, because the heat quantity of the refrigeration cycle is greater than the cold quantity, and the states of the dried objects in the drying area have differences, the balance can be achieved only by supplementing a certain amount of cold quantity to the system, so that the required cold quantity is used for precooling the gas, and the purposes of moisture condensation and discharge of the gas when the cold quantity is utilized to a greater extent are achieved.

Further, the high-efficiency multi-stage drying system 100 may further include a second water pipe 114, one end of the second water pipe 114 is communicated with the first heat exchange surface of the first heat exchange assembly 109 or with the air duct communicated with the first heat exchange surface of the first heat exchange assembly 109, the other end of the second water pipe 114 is communicated with an inlet of a fourth heat exchanger 118, so as to guide the condensed water generated by the first heat exchange assembly 109 to the fourth heat exchanger 118, and an outlet of the fourth heat exchanger 118 is connected to the drying area and the area outside the air duct. That is, the second water pipe 114 is used for guiding the condensed water generated by the first heat exchange assembly 109 to the fourth heat exchanger 118 for heat exchange of the gas by the fourth heat exchanger 118; and after heat exchange, discharging the condensed water out of the air duct and the drying area. Of course, the cold source of the fourth heat exchanger 118 may also be derived from an external flowable medium, such as cooling water in a cooling tower.

In an optional embodiment, the high-efficiency multi-stage drying system 100 further includes a first water pan 112 and a first water pipe 113, the first water pan 112 is disposed below the second heat exchanger 108, one end of the first water pipe 113 is connected to the first water pan 112, the other end of the first water pipe 113 is connected to an inlet of a fourth heat exchanger 118, so as to guide water in the first water pan 112 to the fourth heat exchanger 118, and an outlet of the fourth heat exchanger 118 is connected to all drying areas and areas outside the air duct.

Referring to fig. 5, it should be noted that, in the embodiment of the present invention, the third heat exchanger 117 and the fourth heat exchanger 118 may be disposed at the same time; at this time, the condensed water in the first water receiving tray 112 may be simultaneously drained to the third heat exchanger 117 and the fourth heat exchanger 118, or a valve may be provided to control the draining of the condensed water to the third heat exchanger 117 or the fourth heat exchanger 118.

Referring to fig. 6, in an alternative embodiment, the high efficiency multi-stage drying system 100 may further include a second heat exchange assembly 119, where the second heat exchange assembly 119 has a third heat exchange surface and a fourth heat exchange surface, the third heat exchange surface and the fourth heat exchange surface can exchange heat with the gas flowing through the respective heat exchange surfaces, and the gas flowing through the third heat exchange surface is not in contact with the gas flowing through the fourth heat exchange surface. The third heat exchange surface of the second heat exchange assembly 119 is located downstream of the third heat exchanger 117 in the first air duct 103, and the first fan 110 is configured to enable the first air to start from the first drying region 101, sequentially pass through the first heat exchange surface, the third heat exchange surface of the second heat exchange assembly 119, the first heat exchanger 107 along the first air duct 103, and return to the first drying region 101. The fourth heat exchange surface of the second heat exchange assembly 119 is located upstream of the second heat exchanger 108 in the second air duct 104, and the second fan 111 is configured to enable the second air to flow from the second drying region 102, sequentially through the fourth heat exchange surface of the second heat exchange assembly 119, the second heat exchanger 108, the second heat exchange surface of the first heat exchange assembly 109, and return to the second drying region 102.

It should be noted that, the second heat exchange assembly 119 may perform further waste heat recovery, and the first gas is cooled after being cooled by the first heat exchange assembly 109, and the cooled temperature may be lower than the temperature of the second drying region 102 and lower than the temperature of the second gas flowing out from the second region. After the first gas and the second gas exchange heat through the second heat exchange assembly 119, the first gas is heated, the second gas is cooled, the first gas is further heated through the first heat exchanger 107, and the second gas is further cooled through the second heat exchanger 108. The total amount of the cooled second gas is larger than the cold quantity of the refrigeration cycle, so that the operation with higher cold quantity is realized, and the first gas is further driven to realize larger cold quantity through the first heat exchange assembly 109, so that the purposes of higher energy efficiency and more energy-saving operation are achieved.

It should be understood that the first heat exchange assembly 109 and the second heat exchange assembly 119 described above may have a variety of configurations. Referring to fig. 7 to 9, several structural forms of the first heat exchange assembly 109 will be briefly described, and accordingly, the structural form of the second heat exchange assembly 119 may refer to the first heat exchange assembly 109.

Referring to fig. 7, optionally, the first heat exchange assembly 109 includes a first channel and a second channel that are not communicated, a heat conducting medium is disposed between the first channel and the second channel, the first channel forms a first heat exchange surface, and the second channel forms a second heat exchange surface; the heat conducting medium can be metal with good heat conducting effect.

Referring to fig. 8, alternatively, the first heat exchange assembly 109 includes a first sub heat exchanger 1091 and a second sub heat exchanger 1092, the second sub heat exchanger 1092 is higher than the first sub heat exchanger 1091, the first sub heat exchanger 1091 and the second sub heat exchanger 1092 are connected to form a closed cavity, the cavity is used for accommodating a refrigerant, the surface of the first sub heat exchanger 1091 is a first heat exchange surface, and the outer surface of the second sub heat exchanger 1092 is a second heat exchange surface;

referring to fig. 9, alternatively, the first heat exchange assembly 109 includes a first sub heat exchanger 1091, a second sub heat exchanger 1092, and a water pump 1093, the first sub heat exchanger 1091 and the second sub heat exchanger 1092 are connected by a pipeline and form a closed circulation system, a medium flows in the closed circulation system, the water pump 1093 is disposed in the closed circulation system and is used for enabling the medium to flow in the system in a circulating manner, an outer surface of the first sub heat exchanger 1091 is a first heat exchange surface, and an outer surface of the second sub heat exchanger 1092 is a second heat exchange surface.

It should be noted that the first heat exchange assembly 109 and the second heat exchange assembly 119 may have the same or similar structures. That is to say, the second heat exchange assembly 119 may also be in the above three cases, and the first heat exchange assembly 109 and the second heat exchange assembly 119 may be in different structural forms. That is, when the first heat exchange assembly 109 adopts the first structural form, the second heat exchange assembly 119 may adopt any one of the three structural forms, for example, the second heat exchange assembly 119 adopts the second structural form.

Referring to fig. 10 to 14, an embodiment of the present invention provides a high-efficiency multi-stage drying system 100, which includes a first drying region 101, a second drying region 102, a first air duct 103, a second air duct 104, a compressor 105, a first heat exchange assembly 109, a throttle device 106, a first heat exchanger 107, a second heat exchanger 108, a first fan 110, a second fan 111, an air duct between 1 st to N, a drying region between 1 st to N, a heat exchange assembly between 1 st to N, and a fan between 1 st to N, where N is a positive integer greater than or equal to 1.

An exhaust port of the compressor 105 is connected with an inlet of the first heat exchanger 107, an outlet of the first heat exchanger 107 is connected with an inlet of the throttling device 106, an outlet of the throttling device 106 is connected with an inlet of the second heat exchanger 108, an outlet of the second heat exchanger 108 is connected with a suction port of the compressor 105, and the compressor 105, the first heat exchanger 107, the second heat exchanger 108 and the throttling device 106 are used for allowing a refrigerant to circularly flow. The first drying area 101, the second drying area 102 and the 1 st to N th intermediate drying areas are all used for drying objects to be dried, the temperature of the first drying area 101 is higher than that of the second drying area 102, and the temperatures of the 1 st to N th intermediate drying areas are lower than that of the first drying area 101 and higher than that of the second drying area 102; and when N is more than or equal to 2, the temperature of the kth middle drying area is less than that of the kth-1 middle drying area, wherein k is a positive integer and the value of k is from 2 to N.

The first heat exchange assembly 109 has a first heat exchange surface and a second heat exchange surface, which are capable of exchanging heat for gas flowing through each, and the gas flowing through the first heat exchange surface is not in contact with the gas flowing through the second heat exchange surface.

The 1 st to the N th intermediate heat exchange assemblies are provided with a first intermediate heat exchange surface and a second intermediate heat exchange surface, the first intermediate heat exchange surface and the second intermediate heat exchange surface can exchange heat for respective gas flowing through, and the gas flowing through the first intermediate heat exchange surface is not contacted with the gas flowing through the second intermediate heat exchange surface.

When N ═ 1: the 1 st to nth intermediate drying areas are first intermediate drying areas 120, the 1 st to nth intermediate heat exchange assemblies are first intermediate heat exchange assemblies 121, the 1 st to nth intermediate air ducts are first intermediate air ducts 122, and the 1 st to nth intermediate fans are first intermediate fans 123.

The two ends of the first air duct 103 are respectively communicated with the first drying area 101, and the first fan 110 makes the air in the first drying area 101 start from the first drying area 101, sequentially flow through the first intermediate heat exchange surface of the first intermediate heat exchange assembly 121 and the first heat exchanger 107 along the first air duct 103, then flow into the first drying area 101, and circulate accordingly.

The two ends of the second air duct 104 are respectively communicated with the second drying area 102, and the second fan 111 enables the air in the second drying area 102 to start from the second drying area 102, sequentially flow through the second heat exchanger 108 and the second heat exchange surface of the first heat exchange assembly 109 along the second air duct 104, and then flow into the second drying area 102, and circulate in this way.

The two ends of the first middle air duct 122 are respectively communicated with the first middle drying area 120, and the first middle fan 123 is configured to enable air in the first middle drying area 120 to sequentially flow through the first heat exchange surface of the first heat exchange assembly 109 and the second middle heat exchange surface of the first middle heat exchange assembly 121 along the first middle air duct 122, and then flow into the first middle drying area 120, and circulate accordingly.

When N is more than or equal to 2: the 1 st to N middle drying areas comprise an ith middle drying area, the 1 st to N middle heat exchange assemblies comprise an ith middle heat exchange assembly, the 1 st to N middle air channels comprise an ith middle air channel, and the 1 st to N middle fans comprise an ith middle fan, wherein i is a positive integer, and the value of i ranges from 1 to N-1.

The two ends of the first air duct 103 are respectively communicated with the first drying area 101, and the first fan 110 is configured to enable the first air to flow from the first drying area 101, along the first air duct 103, sequentially through the first intermediate heat exchange surface of the first intermediate heat exchange assembly 121 and the first heat exchanger 107, and then flow into the first drying area 101, and circulate in this way.

The two ends of the second air duct 104 are respectively communicated with the second drying area 102, and the second fan 111 is configured to enable the second air to flow from the second drying area 102, along the second air duct 104, sequentially pass through the second heat exchanger 108 and the second heat exchange surface of the first heat exchange assembly 109, then flow into the second drying area 102, and circulate accordingly.

Two ends of the ith intermediate air duct are respectively communicated with the ith intermediate drying area, and the ith intermediate fan is used for enabling air in the ith intermediate drying area to sequentially flow through the first intermediate heat exchange surface of the (i + 1) th intermediate heat exchange assembly and the second intermediate heat exchange surface of the ith intermediate heat exchange assembly along the ith intermediate air duct and then flow into the ith intermediate drying area to circulate. For example, when i is 2, two ends of the second intermediate air duct 126 are communicated with the second intermediate drying region 124, and the second intermediate fan 127 is configured to make the air in the second intermediate drying region 124 sequentially flow through the first intermediate heat exchange surface of the third intermediate heat exchange assembly and the second intermediate heat exchange surface of the second intermediate heat exchange assembly 125 along the second intermediate air duct 126, and then flow into the second intermediate drying region 124, and circulate in this way.

The two ends of the nth intermediate air duct are respectively communicated with the nth intermediate drying area, and the nth intermediate fan is configured to enable air in the nth intermediate drying area to sequentially flow through the first heat exchange surface of the first heat exchange assembly 109 and the second intermediate heat exchange surface of the nth intermediate heat exchange assembly along the nth intermediate air duct, and then flow into the first intermediate drying area 120, and circulate in this way.

Referring to fig. 12 to 14, in an alternative embodiment, the high-efficiency multi-stage drying system 100 further includes at least one pre-cooling heat exchanger, an inlet of the pre-cooling heat exchanger is used for flowing a cooling medium, an outlet of the pre-cooling heat exchanger is used for guiding the cooling medium to the drying area and outside the air duct, and the cooling medium is used for exchanging heat with the air. The precooling heat exchanger has the following three conditions, and in the embodiment of the present invention, at least one of the following three conditions is included:

the pre-cooling heat exchanger is located upstream of a first intermediate heat exchange surface of a first intermediate heat exchange assembly 121 within the first air duct 103;

and/or, the pre-cooling heat exchanger is located upstream of the second heat exchanger 108 in the second air duct 104; and/or the precooling heat exchanger is positioned in at least one of the 1 st to N-1 th intermediate air ducts and is positioned at the upstream of the first intermediate heat exchange surface of the corresponding 2 nd to N th intermediate heat exchange assembly; for example, the pre-cooling heat exchanger may be located in the first intermediate air duct 122 upstream of the first intermediate heat exchange surface of the second intermediate heat exchange assembly 125, or the pre-cooling heat exchanger may be located in the second intermediate air duct 126 upstream of the first intermediate heat exchange surface of the third intermediate heat exchange assembly, etc.

And/or, the pre-cooling heat exchanger is located upstream of the first intermediate heat exchange surface of the first intermediate heat exchange assembly 121 in the nth intermediate air duct.

It will be appreciated that the pre-cooling heat exchanger enables pre-cooling of the gas, further improving efficiency.

In an alternative embodiment, the high efficiency multi-stage drying system 100 further includes at least one drain pipe, and in an embodiment of the present invention, at least one of the following situations may be included.

In the first case: referring to fig. 12 and 13, the at least one pre-cooling heat exchanger includes an mth intermediate pre-cooling heat exchanger, when m is equal to 1, the mth intermediate pre-cooling heat exchanger is a first intermediate pre-cooling heat exchanger 128, and the first intermediate pre-cooling heat exchanger 128 is located upstream of the first intermediate heat exchange surface of the first intermediate heat exchange assembly 121 in the first air duct 103; when m is larger than or equal to 2, the mth intermediate precooling heat exchanger is positioned at the upstream of the first intermediate heat exchange surface of the mth intermediate heat exchange assembly in the mth-1 intermediate air duct; the at least one drain pipe comprises a jth intermediate drain pipe, the jth intermediate drain pipe is communicated with a first intermediate heat exchange surface water path of the jth intermediate heat exchange assembly, the jth intermediate drain pipe is connected with an inlet of the mth intermediate precooling heat exchanger and is used for guiding the condensed water to the mth intermediate precooling heat exchanger, wherein m and j are positive integers, and m is greater than or equal to 1 and is less than or equal to j and is less than or equal to N;

shown is the case when m is 2, when the second intermediate pre-cooling heat exchanger 130 is located within the first intermediate air duct 122, upstream of the first intermediate heat exchange surface of the second intermediate heat exchange assembly 125; at this time, the jth intermediate water pipe may be the first intermediate water discharge pipe 129 and/or the second intermediate water discharge pipe 131, and the jth intermediate heat exchange assembly includes the first intermediate heat exchange assembly 121 and the second intermediate heat exchange assembly 125.

When m is 2, there are two cases:

1, j ═ 1: a first intermediate drain pipe 129 is connected to the first intermediate heat exchange surface of the first intermediate heat exchange assembly 121 or a nearby air duct, for draining condensed water thereof to the first intermediate pre-cooling heat exchanger 128;

two, j ═ 2: a second intermediate drain 131 is connected to the first intermediate heat exchange surface of the second intermediate heat exchange assembly 125 or a nearby air duct for draining condensate thereof to the first intermediate pre-cooling heat exchanger 128 and/or the second intermediate pre-cooling heat exchanger 130.

And/or, in the second case: referring to fig. 14, the efficient multi-stage drying system 100 further includes a water pan 133, the water pan 133 is disposed below the second heat exchanger 108, and the at least one drain pipe includes a first drain pipe 132, the first drain pipe 132 is respectively connected to the water pan 133 and an inlet of the pre-cooling heat exchanger, and is configured to guide the condensed water generated by the second heat exchanger 108 to any one of the at least one pre-cooling heat exchanger; the pre-cooling heat exchanger here may be a pre-cooling heat exchanger at any position, including the pre-cooling heat exchanger in the first case and the pre-cooling heat exchanger in the third case.

And/or, a third case: continuing to refer to fig. 14, the at least one water drainage pipe includes a second water drainage pipe 134, the second water drainage pipe 134 is in water path communication with the first heat exchange assembly 109, and is connected to an inlet of the pre-cooling heat exchanger located in the nth intermediate air duct or the mth intermediate pre-cooling heat exchanger corresponding to the first heat exchange assembly 109, and is configured to guide the condensed water generated by the first heat exchange assembly 109 to the pre-cooling heat exchanger corresponding to the first heat exchange assembly 109; the precooling heat exchanger here may be any one of the above intermediate precooling heat exchangers, or a precooling heat exchanger located in the nth intermediate air duct.

The embodiment of the utility model provides a high-efficient multistage drying system 100 the beneficial effects of the embodiment of the utility model are that: the compression refrigeration cycle, provide cold volume Q through second heat exchanger 108, whole consumed power P, the second gas is cooled after passing through second heat exchanger 108, release heat energy Q, some moisture is condensed, discharge, the second gas is through first heat exchange assembly 109 and first gas heat transfer back, the second gas is heated, absorb heat Q, the first gas is cooled after this heat transfer process, release heat energy Q, some moisture is condensed, the second gas continues to flow into second stoving region 102 along second wind channel 104, the first gas continues to be heated after passing through first heat exchanger 107 along first wind channel 103, then flow into first stoving region 101, form the circulation. The first gas and the second gas are totally cooled in the treatment process, 2Q heat energy is released, the quantity of cold Q provided by the conventional compression refrigeration cycle is doubled, the power consumption increased in the process is very limited, only the power consumption for heat exchange of the first gas and the second gas is increased, and the power consumption is far less than the integral power consumption P. The embodiment of the utility model provides a more high-efficient, more energy-conserving heat pump drying system is provided.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The efficient multistage drying system is characterized by comprising a first drying area (101), a second drying area (102), a first air duct (103), a second air duct (104), a compressor (105), a throttling device (106), a first heat exchanger (107), a second heat exchanger (108), a first heat exchange assembly (109), a first fan (110) and a second fan (111);

the exhaust port of the compressor (105) is connected with the inlet of the first heat exchanger (107), the outlet of the first heat exchanger (107) is connected with the inlet of the throttling device (106), the outlet of the throttling device (106) is connected with the inlet of the second heat exchanger (108), the outlet of the second heat exchanger (108) is connected with the suction port of the compressor (105), and the compressor (105), the first heat exchanger (107), the second heat exchanger (108) and the throttling device (106) are used for circulating refrigerant;

the first drying area (101) and the second drying area (102) are used for drying objects to be dried, and the temperature of the first drying area (101) is higher than that of the second drying area (102);

the first heat exchange assembly (109) has a first heat exchange surface and a second heat exchange surface, the first heat exchange surface and the second heat exchange surface are capable of exchanging heat for gas flowing through each, and gas flowing through the first heat exchange surface is not in contact with gas flowing through the second heat exchange surface;

the inlet and outlet ends of the first air duct (103) are respectively communicated with the first drying area (101), a first air flows through the first air duct (103), and the first fan (110) is used for enabling the first air to flow from the first drying area (101), sequentially pass through the first heat exchange surface of the first heat exchange assembly (109) and the first heat exchanger (107) along the first air duct (103), then flow into the first drying area (101), and circulate in the first drying area (101);

the inlet and outlet ends of the second air duct (104) are respectively communicated with the second drying area (102), second air flows through the second air duct (104), and the second air flows through the second heat exchanger (108) and the second heat exchange surface of the first heat exchange assembly (109) along the second air duct (104) from the second drying area (102) and then flows into the second drying area (102) along with the second air duct (104) and circulates.

2. The system of claim 1, further comprising a first water pan (112) and a first water pipe (113), wherein the first water pan (112) is disposed below the second heat exchanger (108), and the first water pipe (113) is connected to the first water pan (112) for draining water in the first water pan (112) to an area outside the first drying area (101), the second drying area (102), the first air duct (103), and the second air duct (104).

3. The system of claim 1, wherein the system (100) further comprises a second water pipe (114), and the second water pipe (114) is used for guiding the condensed water generated by the first heat exchange assembly (109) to the area outside the first drying area (101), the second drying area (102), the first air duct (103) and the second air duct (104).

4. A high efficiency multi-stage drying system according to any of the claims 1-3, wherein the first air duct (103) is provided with a first bypass air duct (115), the first bypass air duct (115) communicating upstream and downstream of the first heat exchange surface of the first heat exchange assembly (109);

and/or the second air duct (104) is provided with a second bypass air duct (116), and the second bypass air duct (116) is communicated with the upstream and the downstream of the second heat exchanger (108).

5. A high efficiency multi-stage drying system according to claim 1, wherein said high efficiency multi-stage drying system (100) further comprises a third heat exchanger (117), said third heat exchanger (117) being located within said second air duct (104) upstream of said second heat exchanger (108), said second fan (111) being adapted to cause said second air to flow from said second drying zone (102) along said second air duct (104) and to flow into said second drying zone (102) along said third heat exchanger (117), said second heat exchanger (108) and said second heat exchange surface of said first heat exchange assembly (109) in sequence.

6. The system of claim 5, further comprising a first water pan (112) and a first water pipe (113), wherein the first water pan (112) is disposed below the second heat exchanger (108), and one end of the first water pipe (113) is connected to the first water pan (112) and the other end is connected to an inlet of the third heat exchanger (117) for guiding water in the first water pan (112) to the third heat exchanger (117).

7. A high efficiency multi-stage drying system according to claim 1, 5 or 6, wherein the high efficiency multi-stage drying system (100) further comprises a fourth heat exchanger (118), the fourth heat exchanger (118) being located within the first air duct (103) upstream of the first heat exchange surface of the first heat exchange assembly (109), and the first fan (110) being adapted to circulate the first gas along the first air duct (103) out of the first drying zone (101), through the fourth heat exchanger (118), the first heat exchange surface of the first heat exchange assembly (109), the first heat exchanger (107) and into the first drying zone (101).

8. The high efficiency multi-stage drying system according to claim 7, wherein the high efficiency multi-stage drying system (100) further comprises a second water pipe (114), the second water pipe (114) is used for guiding the condensed water generated by the first heat exchange surface of the first heat exchange assembly (109) to the fourth heat exchanger (118), and an outlet of the fourth heat exchanger (118) is connected to a drying area and an area outside the air duct.

9. The system of claim 8, further comprising a first water pan (112) and a first water pipe (113), wherein the first water pan (112) is disposed below the second heat exchanger (108), one end of the first water pipe (113) is connected to the first water pan (112), and the other end of the first water pipe is connected to an inlet of the fourth heat exchanger (118) for guiding water in the first water pan (112) to the fourth heat exchanger (118), and an outlet of the fourth heat exchanger (118) is connected to all drying areas and areas outside the air duct.

10. The high efficiency multi-stage drying system according to any of the claims 1-3, wherein the high efficiency multi-stage drying system (100) further comprises a second heat exchange assembly (119), the second heat exchange assembly (119) having a third heat exchange surface and a fourth heat exchange surface, the third heat exchange surface and the fourth heat exchange surface being capable of exchanging heat for gas flowing through each, and the gas flowing through the third heat exchange surface is not in contact with the gas flowing through the fourth heat exchange surface;

the third heat exchange surface of the second heat exchange assembly (119) is located downstream of the first heat exchange surface of the first heat exchange assembly (109) in the first air duct (103), and the first fan (110) is configured to make the first air flow from the first drying region (101), pass through the first heat exchange surface of the first heat exchange assembly (109), the third heat exchange surface of the second heat exchange assembly (119), the first heat exchanger (107) along the first air duct (103), and return to the first drying region (101);

the fourth heat exchange surface of the second heat exchange assembly (119) is located upstream of the second heat exchanger (108) in the second air duct (104), and the second fan (111) is configured to enable the second air to flow from the second drying region (102), sequentially through the fourth heat exchange surface of the second heat exchange assembly (119), the second heat exchanger (108), the second heat exchange surface of the first heat exchange assembly (109), and back to the second drying region (102).

11. A high efficiency multi-stage drying system according to any of the claims 1-3, wherein the first heat exchange assembly (109) comprises a first and a second channel which are not in communication, between which a heat transfer medium is arranged, the first channel forming the first heat exchange surface and the second channel forming the second heat exchange surface;

or the first heat exchange assembly (109) comprises a first sub heat exchanger (1091) and a second sub heat exchanger (1092), the second sub heat exchanger (1092) is higher than the first sub heat exchanger (1091), the first sub heat exchanger (1091) and the second sub heat exchanger (1092) are connected to form a closed cavity, the cavity is used for accommodating a refrigerant, the outer surface of the first sub heat exchanger (1091) is the first heat exchange surface, and the outer surface of the second sub heat exchanger (1092) is the second heat exchange surface;

or, the first heat exchange assembly (109) comprises a first sub heat exchanger (1091), a second sub heat exchanger (1092) and a water pump (1093), the first sub heat exchanger (1091) and the second sub heat exchanger (1092) are connected through a pipeline and form a closed circulation system, a medium flows in the closed circulation system, the water pump (1093) is arranged in the closed circulation system and used for enabling the medium to flow in the closed circulation system in a circulating manner, the surface of the first sub heat exchanger (1091) is the first heat exchange surface, and the outer surface of the second sub heat exchanger (1092) is the second heat exchange surface.

12. A high-efficiency multistage drying system is characterized by comprising a first drying area (101), a second drying area (102), a first air duct (103), a second air duct (104), a compressor (105), a first heat exchange assembly (109), a throttling device (106), a first heat exchanger (107), a second heat exchanger (108), a first fan (110), a second fan (111), 1-N middle air ducts, 1-N middle drying areas, 1-N middle heat exchange assemblies and 1-N middle fans, wherein N is a positive integer greater than or equal to 1;

the first drying area (101), the second drying area (102) and the 1 st to Nth middle drying areas are all used for drying objects to be dried, the temperature of the first drying area (101) is higher than that of the second drying area (102), the temperature of the 1 st to Nth middle drying areas is lower than that of the first drying area (101) and higher than that of the second drying area (102), and when N is larger than or equal to 2, the temperature of the kth middle drying area is lower than that of the k-1 th middle drying area, wherein k is a positive integer, and the value of k is from 2 to N;

the 1 st to N th intermediate heat exchange assemblies are provided with a first intermediate heat exchange surface and a second intermediate heat exchange surface, the first intermediate heat exchange surface and the second intermediate heat exchange surface can exchange heat for respective gas, and the gas flowing through the first intermediate heat exchange surface is not contacted with the gas flowing through the second intermediate heat exchange surface;

when N ═ 1:

the 1 st to Nth middle drying areas are first middle drying areas (120), the 1 st to Nth middle heat exchange assemblies are first middle heat exchange assemblies (121), the 1 st to Nth middle air ducts are first middle air ducts (122), and the 1 st to Nth middle fans are first middle fans (123);

the two ends of the first air duct (103) are respectively communicated with the first drying area (101), and the first fan (110) enables the air in the first drying area (101) to flow from the first drying area (101), along the first air duct (103), sequentially pass through the first intermediate heat exchange surface of the first intermediate heat exchange assembly (121) and the first heat exchanger (107), then flow into the first drying area (101), and circulate in the first drying area (101);

the two ends of the second air duct (104) are respectively communicated with the second drying area (102), and the second fan (111) enables the air in the second drying area (102) to flow from the second drying area (102), along the second air duct (104), sequentially pass through the second heat exchanger (108) and the second heat exchange surface of the first heat exchange assembly (109), then flow into the second drying area (102), and circulate in the second drying area (102);

the two ends of the first intermediate air duct (122) are respectively communicated with the first intermediate drying area (120), and the first intermediate fan (123) is used for enabling the air in the first intermediate drying area (120) to sequentially flow through the first heat exchange surface of the first heat exchange assembly (109) and the second intermediate heat exchange surface of the first intermediate heat exchange assembly (121) along the first intermediate air duct (122), then flow into the first intermediate drying area (120), and circulate in the first intermediate drying area;

when N is more than or equal to 2:

the 1 st to N middle drying areas comprise an ith middle drying area, the 1 st to N middle heat exchange assemblies comprise ith middle heat exchange assemblies, the 1 st to N middle air channels comprise ith middle air channels, and the 1 st to N middle fans comprise ith middle fans, wherein i is a positive integer, and the value of i is from 1 to N-1;

two ends of the first air duct (103) are respectively communicated with the first drying area (101), and the first fan (110) is used for enabling the first air in the first drying area (101) to flow from the first drying area (101), sequentially pass through the first intermediate heat exchange surface of the first intermediate heat exchange assembly (121) and the first heat exchanger (107) along the first air duct (103), then flow into the first drying area (101), and circulate in the first drying area (101);

two ends of the second air duct (104) are respectively communicated with the second drying area (102), and the second fan (111) is used for enabling the second air in the second drying area (102) to flow from the second drying area (102), sequentially pass through the second heat exchanger (108) and the second heat exchange surface of the first heat exchange assembly (109) along the second air duct (104), then flow into the second drying area, and circulate in the second drying area;

two ends of the ith intermediate air duct are respectively communicated with an ith intermediate drying area, and the ith intermediate fan is used for enabling air in the ith intermediate drying area to sequentially flow through a first intermediate heat exchange surface of an (i + 1) th intermediate heat exchange assembly and a second intermediate heat exchange surface of an ith intermediate heat exchange assembly along the ith intermediate air duct, then flow into the ith intermediate drying area and circulate in the ith intermediate drying area;

two ends of the Nth middle air duct are respectively communicated with the Nth middle drying area, and the Nth middle fan is used for enabling the air in the Nth middle drying area to sequentially flow through the first heat exchange surface of the first heat exchange assembly (109) and the second middle heat exchange surface of the Nth middle heat exchange assembly along the Nth middle air duct, then flow into the first middle drying area (120) and circulate in the way.

13. The high-efficiency multi-stage drying system according to claim 12, wherein the high-efficiency multi-stage drying system (100) further comprises at least one pre-cooling heat exchanger, an inlet of the pre-cooling heat exchanger is used for flowing a cooling medium, an outlet of the pre-cooling heat exchanger is used for guiding the cooling medium to the outside of the drying area and the air duct, and the cooling medium is used for exchanging heat with the air;

the pre-cooling heat exchanger is located upstream of a first intermediate heat exchange surface of the first intermediate heat exchange assembly (121) within the first air duct (103);

and/or the pre-cooling heat exchanger is located upstream of the second heat exchanger (108) within the second air duct (104);

and/or the precooling heat exchanger is positioned in at least one of the 1 st to N-1 th intermediate air ducts and is positioned at the upstream of the first intermediate heat exchange surface of the corresponding 2 nd to N th intermediate heat exchange assembly;

and/or the pre-cooling heat exchanger is located upstream of the first intermediate heat exchange surface of the first intermediate heat exchange assembly (121) in the nth intermediate air duct.

14. The high efficiency multi-stage drying system of claim 13, wherein the high efficiency multi-stage drying system (100) further comprises at least one drain;

the at least one precooling heat exchanger comprises an mth intermediate precooling heat exchanger, when m is equal to 1, the mth intermediate precooling heat exchanger is a first intermediate precooling heat exchanger (128), and the first intermediate precooling heat exchanger (128) is positioned on the upstream of a first intermediate heat exchange surface of the first intermediate heat exchange assembly (121) in the first air duct (103); when m is larger than or equal to 2, the mth intermediate precooling heat exchanger is positioned at the upstream of the first intermediate heat exchange surface of the mth intermediate heat exchange assembly in the mth-1 intermediate air duct; the at least one drain pipe comprises a jth intermediate drain pipe, the jth intermediate drain pipe is communicated with a first intermediate heat exchange surface water path of a jth intermediate heat exchange assembly, the jth intermediate drain pipe is connected with an inlet of the mth intermediate precooling heat exchanger and is used for draining condensed water to the mth intermediate precooling heat exchanger, wherein m and j are positive integers, and m is greater than or equal to 1 and is less than or equal to j and is less than or equal to N;

and/or the efficient multi-stage drying system (100) further comprises a water pan (133), the water pan (133) is arranged below the second heat exchanger (108), the at least one water drain pipe comprises a first water drain pipe (132), and the first water drain pipe (132) is respectively connected with the water pan (133) and the inlets of the pre-cooling heat exchangers and is used for guiding the condensed water generated by the second heat exchanger (108) to any one of the at least one pre-cooling heat exchanger;

and/or, at least one drain pipe includes second drain pipe (134), second drain pipe (134) with first heat transfer subassembly (109) water route intercommunication, and with what first heat transfer subassembly (109) corresponded, be located in the wind channel in the middle of the Nth precooling heat exchanger or the access connection of precooling heat exchanger in the middle of the mth, be used for with the comdenstion water drainage that first heat transfer subassembly (109) produced to with first heat transfer subassembly (109) corresponds the precooling heat exchanger.