Heat recovery drying equipment

Abstract

The utility model discloses heat recovery drying equipment, which belongs to the technical field of drying, and is characterized in that when a first humidity sensor measures that first humidity in a drying room is greater than preset humidity, a dehumidification fan conveys high-temperature and high-humidity air in the drying room into a preheating chamber, and external cold air enters the preheating chamber from a vent hole; due to the fact that the heat exchange section of the moisture discharging pipe is arranged in the preheating chamber, high-temperature and high-humidity air enters the heat exchange section to enable the temperature of the heat exchange section to rise, the heat exchange section heats cold air in the preheating chamber, the high-temperature and high-humidity air is discharged into the preheating chamber through the moisture discharging holes, and the high-temperature and high-humidity air and the cold air are mixed to form medium-temperature and medium-humidity air. The temperature of the medium-temperature and medium-humidity air is higher than that of outside cold air, the humidity of the medium-temperature and medium-humidity air is lower than that of high-temperature and high-humidity air exhausted from the drying room, and the medium-temperature and medium-humidity air is conveyed into the drying room through the air inlet assembly to serve as fresh air supplement, so that the temperature in the drying room can be prevented from being sharply reduced; and the heat loss of the high-temperature and high-humidity air can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of drying, in particular to a heat recovery drying device. Background Art

[0002] Heat pump drying equipment utilizes the principle of reverse Carnot to absorb the heat of air and transfer it into the room, so as to increase the temperature of the drying room, and cooperate with corresponding equipment to realize the drying of materials. At present, the increase in temperature in the drying room causes the water in the materials to be separated out. The long-term heating of the materials in the drying room will generate high-temperature and high-humidity air, and a dehumidification device needs to be set up to regularly discharge the high-temperature and high-humidity air in the drying room to avoid the excessive humidity in the drying room affecting the drying effect. However, after the dehumidification device discharges the high-temperature and high-humidity air, the high-temperature and high-humidity air will take away heat, resulting in heat loss in the drying room. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a heat recovery drying device, which can avoid the sharp drop in the temperature in the drying room and help reduce the heat loss of high-temperature and high-humidity air.

[0004] The heat recovery drying device according to an embodiment of the utility model includes:

[0005] A preheating chamber provided with a plurality of ventilation holes;

[0006] A drying room separated from the preheating chamber;

[0007] An air inlet assembly communicating the preheating chamber and the drying room, and when the air inlet assembly is started, the gas in the preheating chamber enters the drying room;

[0008] A dehumidification pipe communicating the drying room, the dehumidification pipe is provided with a heat exchange section, the heat exchange section is arranged in the preheating chamber, and the heat exchange section is provided with dehumidification holes;

[0009] A dehumidification fan arranged in the dehumidification pipe, and when the dehumidification fan is started, the gas in the drying room enters the dehumidification pipe;

[0010] A first humidity sensor arranged in the drying room to measure the first humidity in the drying room;

[0011] A controller configured to: when the first humidity is greater than a preset humidity, the controller controls the air inlet assembly and the dehumidification fan to start.

[0012] The heat recovery drying equipment according to the embodiments of the present utility model has at least the following beneficial effects: When the first humidity sensor measures that the first humidity in the drying room is greater than the preset humidity, the controller starts the air intake assembly and the moisture exhaust fan. The moisture exhaust fan transports the high-temperature and high-humidity air in the drying room to the preheating chamber through the moisture exhaust pipe. The outside cold air enters the preheating chamber through the ventilation holes. Since the heat exchange section of the moisture exhaust pipe is arranged in the preheating chamber, the high-temperature and high-humidity air entering the heat exchange section raises the temperature of the heat exchange section, enabling the heat exchange section to heat the cold air in the preheating chamber. Moreover, the high-temperature and high-humidity air is discharged into the preheating chamber through the moisture exhaust holes. The high-temperature and high-humidity air mixes with the cold air to form medium-temperature and medium-humidity air. The temperature of the medium-temperature and medium-humidity air is higher than that of the outside cold air, and the humidity of the medium-temperature and medium-humidity air is lower than that of the high-temperature and high-humidity air discharged from the drying room. The medium-temperature and medium-humidity air is then transported to the drying room through the air intake assembly as fresh air supplement, which can avoid a sharp drop in the temperature in the drying room and help reduce the heat loss of the high-temperature and high-humidity air.

[0013] According to some embodiments of the present utility model, the heat exchange section spirally extends upward around the vertical axis, and the air intake assembly communicates with the top of the preheating chamber.

[0014] According to some embodiments of the present utility model, there are multiple moisture exhaust holes, and the heat recovery drying equipment further includes:

[0015] Multiple moisture exhaust valves, and the multiple moisture exhaust valves are respectively arranged corresponding to the multiple moisture exhaust holes;

[0016] The controller is further configured to: when the first humidity is greater than the preset humidity, the controller controls the number of the opened moisture exhaust valves to be proportional to the magnitude of the first humidity.

[0017] According to some embodiments of the present utility model, the number of the ventilation holes gradually decreases from bottom to top.

[0018] According to some embodiments of the present utility model, heat exchange elements are arranged on the side wall of the heat exchange section.

[0019] According to some embodiments of the present utility model, a drain hole is provided at the bottom of the preheating chamber.

[0020] According to some embodiments of the present utility model, the heat recovery drying equipment further includes:

[0021] A second humidity sensor, which is arranged in the preheating chamber and measures the second humidity of the preheating chamber;

[0022] The controller is further configured to: when the second humidity is greater than the first humidity, the controller controls the air intake assembly to close and controls the moisture exhaust fan to start.

[0023] According to some embodiments of the present utility model, the heat recovery drying equipment further includes:

[0024] A ventilation component is provided in the preheating chamber. After the ventilation component is started, the gas in the preheating chamber is discharged to the outside;

[0025] The controller is further configured to: when the second humidity is greater than the preset humidity, the controller controls the ventilation component to start.

[0026] According to some embodiments of the present invention, the moisture discharge pipe is further provided with a conveying section. The conveying section is arranged between the drying chamber and the preheating chamber, and a heat preservation layer is arranged on the side wall of the conveying section.

[0027] According to some embodiments of the present invention, the heat recovery drying device further includes:

[0028] A heat pump drying device is connected to the drying chamber, and the refrigerant of the heat pump drying device is carbon dioxide.

[0029] Other features and advantages of the present invention will be described in the following description of the specification, and some of them will become obvious from the specification, or will be understood by implementing the present invention. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of a heat recovery drying device according to an embodiment of the present invention.

[0031] Reference numerals: preheating chamber 100, ventilation hole 110, drainage hole 120, drying chamber 200, air intake component 300, moisture discharge pipe 400, heat exchange section 410, moisture discharge hole 411, conveying section 420, moisture discharge fan 500, first humidity sensor 600, moisture discharge valve 700, second humidity sensor 800, ventilation component 900. Detailed Embodiments

[0032] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as front, rear, up, down, axial, circumferential, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0034] In the description of the present utility model, the meaning of "a plurality of" is more than two. Understandings such as "greater than", "less than", and "exceeding" do not include the corresponding number, while understandings such as "above", "below", and "within" include the corresponding number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0035] In the description of the present utility model, it should be noted that terms such as "arrangement", "installation", and "connection" should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0036] Next, the technical solution of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the following described embodiments are some embodiments of the present utility model, not all embodiments.

[0037] In the related art, the working principle of a heat pump drying device is mainly based on the reverse Carnot cycle, which is a heat lifting device that extracts heat from the surrounding environment and transfers it to the object to be heated. This technology enables the refrigerant to complete a thermodynamic cycle process of evaporation (extracting heat from the outdoor environment), compression, condensation (releasing heat in the indoor drying room), throttling, and re-evaporation, thereby transferring the heat in the external low-temperature environment to the drying room.

[0038] After raising the temperature in the drying room, a circulating hot air is formed in the drying room by a fan. The hot air can heat the material and absorb the moisture of the material, thereby drying the material.

[0039] In the prior art, when the hot air continuously absorbs the moisture of the material, the humidity in the drying room continuously increases, generating high-temperature and high-humidity air in the drying room. The high-temperature and high-humidity air has a poor drying effect on the material, so it is necessary to regularly discharge the high-temperature and high-humidity air in the drying room.

[0040] However, when the high-temperature and high-humidity air in the drying room is discharged, the high-temperature and high-humidity air will carry away part of the heat in the drying room, resulting in heat loss of the drying room. Moreover, it is also necessary to supplement dry air into the drying room to reduce the humidity of the drying room. The temperature of the supplemented dry air is relatively low, and the supplemented dry air also needs to absorb the heat in the drying room, thereby causing a sharp drop in the temperature of the drying room.

[0041] Based on this, the embodiments of the present utility model provide a heat recovery drying device, which can avoid a sharp drop in the temperature of the drying room and help reduce the heat loss of the high-temperature and high-humidity air.

[0042] Refer to Figure 1As shown in the figure, the heat recovery drying equipment of the embodiment of the present utility model includes a preheating chamber 100, a drying chamber 200, an air inlet assembly 300, a moisture exhaust pipe 400, a moisture exhaust fan 500, a first humidity sensor 600, and a controller.

[0043] The preheating chamber 100 and the drying chamber 200 are separated, and the outer wall of the drying chamber 200 is generally provided with heat insulation materials to reduce heat loss in the drying chamber 200.

[0044] A plurality of ventilation holes 110 are provided on the side wall of the preheating chamber 100, so that external air can enter the preheating chamber 100 through the ventilation holes 110, and the gas in the preheating chamber 100 can be discharged to the outside through the ventilation holes 110.

[0045] The air inlet assembly 300 includes an air inlet pipe and an air inlet fan. The air inlet pipe communicates the preheating chamber 100 and the drying chamber 200. The air inlet fan is arranged in the air inlet pipe. After the air inlet fan is started, the gas in the preheating chamber 100 is transported to the drying chamber 200.

[0046] One end of the moisture exhaust pipe 400 communicates with the drying chamber 200, and the other end of the moisture exhaust pipe 400 is provided with a heat exchange section 410. The side wall of the heat exchange section 410 is made of a metal pipe or a plastic pipe with heat exchange ability. The heat exchange section 410 extends into the interior of the preheating chamber 100, so that the heat exchange section 410 can exchange heat with the air in the preheating chamber 100. Moreover, the heat exchange section 410 is provided with moisture exhaust holes 411, and the moisture exhaust holes 411 discharge the gas in the moisture exhaust pipe 400 into the preheating chamber 100.

[0047] The moisture exhaust fan 500 is arranged in the moisture exhaust pipe 400. When the moisture exhaust fan 500 is started, the gas in the drying chamber 200 is transported to the preheating chamber 100 through the moisture exhaust pipe 400.

[0048] The first humidity sensor 600 is arranged in the drying chamber 200. The first humidity sensor 600 is used to measure the first humidity in the drying chamber 200 of the vehicle, so as to monitor the gas humidity in the drying chamber 200 in real time.

[0049] The controller is electrically connected to the first humidity sensor 600, the air inlet fan of the air inlet assembly 300, and the moisture exhaust fan 500. The first humidity sensor 600 transmits the measured first humidity to the controller. The controller controls the start or stop of the air inlet fan of the air inlet assembly 300, and the controller controls the start or stop of the moisture exhaust fan 500.

[0050] The control logic of the controller is: when the first humidity transmitted by the first humidity sensor 600 to the controller is relatively large, that is, the first humidity is greater than the preset humidity in the controller, the controller will start the air inlet fan of the air inlet assembly 300 and the moisture exhaust fan 500.

[0051] The moisture exhaust fan 500 transports the high-temperature and high-humidity air in the drying chamber 200 to the preheating chamber 100 through the moisture exhaust pipe 400. The outside cold air enters the preheating chamber 100 from the ventilation holes 110. Since the heat exchange section 410 of the moisture exhaust pipe 400 is arranged in the preheating chamber 100, the high-temperature and high-humidity air entering the heat exchange section 410 raises the temperature of the heat exchange section 410, enabling the heat exchange section 410 to heat the cold air in the preheating chamber 100. Moreover, the high-temperature and high-humidity air is discharged into the preheating chamber 100 through the moisture exhaust holes 411. The high-temperature and high-humidity air mixes with the cold air to form medium-temperature and medium-humidity air. The temperature of the medium-temperature and medium-humidity air is higher than that of the outside cold air, and the humidity of the medium-temperature and medium-humidity air is lower than that of the high-temperature and high-humidity air discharged from the drying chamber 200. The medium-temperature and medium-humidity air is then transported to the drying chamber 200 through the air intake assembly 300 as fresh air supplement, which can avoid a sharp drop in the temperature in the drying chamber 200 and help reduce the heat loss of the high-temperature and high-humidity air.

[0052] In some embodiments, the heat exchange section 410 spirally extends upward from the bottom around the vertical axis, and the air intake channel of the air intake assembly 300 communicates with the top of the preheating chamber 100.

[0053] The spiral shape of the heat exchange section 410 helps to extend the flow distance of the high-temperature and high-humidity air in the heat exchange section 410 and improve the heat exchange effect between the high-temperature and high-humidity air and the heat exchange section 410. Since the high-temperature and high-humidity air flows from bottom to top, the temperature at the bottom of the heat exchange section 410 is higher than that at the top. After the outside low-temperature and low-humidity air enters the preheating chamber 100 and exchanges heat with the heat exchange section 410, the temperature of the low-temperature and low-humidity air gradually rises and turns into medium-temperature and low-humidity air. Since the density is smaller at higher temperatures, the medium-temperature and low-humidity air flows towards the top of the preheating chamber 100, which helps the air intake assembly 300 to inhale the medium-temperature and low-humidity air. Moreover, the high-temperature and high-humidity air discharged from the moisture exhaust holes 411 of the heat exchange section 410 also has a smaller density and flows towards the top of the preheating chamber 100. The high-temperature and high-humidity air mixes with the low-temperature and low-humidity air during the upward movement to form medium-temperature and medium-humidity air, improving the mixing effect between the high-temperature and high-humidity air and the low-temperature and low-humidity air.

[0054] In some embodiments, the heat exchange section 410 is provided with a plurality of moisture exhaust holes 411, and a moisture exhaust valve 700 is arranged on each moisture exhaust hole 411. The opening or closing of the moisture exhaust hole 411 is controlled by the moisture exhaust valve 700. The controller is electrically connected to all the moisture exhaust valves 700. The logic of the controller for controlling the moisture exhaust valves 700 is as follows: When the first humidity in the drying chamber 200 is greater than the preset humidity in the controller, it proves that it is necessary to discharge the high-temperature and high-humidity air in the drying chamber 200. And the amount of the high-temperature and high-humidity air discharged by the heat exchange section 410 depends on the size of the first humidity. Therefore, the greater the first humidity, the more moisture exhaust valves 700 the controller opens.

[0055] For example, set a first humidity threshold, a second humidity threshold, a third humidity threshold... an Nth humidity threshold, where the first humidity threshold is greater than a preset humidity, the second humidity threshold is greater than the first humidity threshold, the third humidity threshold is greater than the second humidity threshold, and the Nth humidity threshold is greater than the (N - 1)th humidity threshold.

[0056] When the first humidity exceeds the first humidity threshold, the controller opens a dehumidification valve 700.

[0057] When the first humidity exceeds the second humidity threshold, the controller opens two dehumidification valves 700.

[0058] When the first humidity exceeds the third humidity threshold, the controller opens three dehumidification valves 700, and so on. When the first humidity exceeds the Nth humidity threshold, the controller opens N dehumidification valves 700.

[0059] The greater the first humidity in the drying chamber 200, the more high-temperature and high-humidity air needs to be discharged to quickly reduce the first humidity in the drying chamber 200, thereby ensuring the drying effect of the drying chamber 200.

[0060] In some embodiments, the number of ventilation holes 110 on the side wall of the preheating chamber 100 gradually decreases from bottom to top.

[0061] Since the bottom temperature of the heat exchange section 410 is relatively high, setting more ventilation holes 110 at the bottom of the preheating chamber 100 helps more low-temperature and low-humidity outside air enter the preheating chamber 100 from the bottom for heat exchange with the heat exchange section 410.

[0062] In some embodiments, heat exchange elements are provided on the side wall of the heat exchange section 410.

[0063] The heat exchange effect between the heat exchange section 410 and the outside is improved through the heat exchange elements.

[0064] In some embodiments, a drain hole 120 is provided at the bottom of the preheating chamber 100.

[0065] Since the heat exchange section 410 exchanges heat with low-temperature and low-humidity outside air, the temperature of the outer side wall of the heat exchange section 410 is relatively low. When the high-temperature and high-humidity air discharged from the moisture discharge hole 411 contacts the low-temperature outer side wall of the heat exchange section 410, it is easy to condense into water droplets and drip to the bottom of the preheating chamber 100. Therefore, the drain hole 120 is provided to drain the condensed water in the preheating chamber 100.

[0066] In some embodiments, a second humidity sensor 800 is provided in the preheating chamber 100. The second humidity sensor 800 is used to measure the second humidity in the preheating chamber 100. The second humidity sensor 800 is electrically connected to the controller, and the second humidity sensor 800 transmits the measured second humidity to the controller.

[0067] The control logic of the controller is as follows: When the second humidity in the preheating chamber 100 exceeds the first humidity in the drying chamber 200, the controller starts the dehumidifying fan 500 to discharge the high-temperature and high-humidity air in the drying chamber 200 into the preheating chamber 100, and the controller closes the intake fan of the intake assembly 300 to allow the air in the preheating chamber 100 to be discharged to the outside through the ventilation holes 110.

[0068] When the second humidity in the preheating chamber 100 exceeds the first humidity in the drying chamber 200, it proves that the air in the preheating chamber 100 is not sufficient to reduce the humidity in the drying chamber 200. It is necessary to directly discharge the air in the preheating chamber 100 and the air in the drying chamber 200 to the outside to avoid excessive humidity in the drying chamber 200.

[0069] In some embodiments, an air exchange assembly 900 is provided in the preheating chamber 100. When the air exchange assembly 900 is started to convey the air in the preheating chamber 100 to the outside, the control logic of the controller is: When the second humidity in the preheating chamber 100 exceeds the preset humidity in the controller, the controller controls the air exchange assembly 900 to discharge the air in the preheating chamber 100.

[0070] When the second humidity in the preheating chamber 100 exceeds the preset humidity in the controller, it proves that the humidity in the preheating chamber 100 has exceeded the humidity threshold for discharging high-temperature and high-humidity air in the drying chamber 200, and the air in the preheating chamber 100 cannot reduce the humidity in the drying chamber 200. Therefore, the air in the preheating chamber 100 is discharged through the air exchange assembly 900 at an accelerated rate.

[0071] In some embodiments, the dehumidifying pipe 400 is further provided with a conveying section 420. The conveying section 420 is located between the outside of the preheating chamber 100 and the outside of the drying chamber 200, and a heat insulation layer is installed on the side wall of the conveying section 420.

[0072] Since the high-temperature and high-humidity air in the drying chamber 200 flows through the conveying section 420 to the heat exchange section 410, the heat insulation layer can reduce the heat loss of the high-temperature and high-humidity air caused by the conveying section 420.

[0073] In some embodiments, a heat pump drying device is provided to communicate with the drying chamber 200, and the heat pump drying device uses carbon dioxide as a refrigerant.

[0074] The heat pump drying device using carbon dioxide as a refrigerant has a high operating efficiency, can quickly increase the temperature in the drying chamber 200, and the working temperature range of the refrigerant is relatively wide, which helps to expand the application scenarios of the heat pump drying device.

[0075] The above has described the embodiments of the present invention in detail with reference to the drawings. However, the present invention is not limited to the above embodiments. Within the knowledge possessed by those of ordinary skill in the art in the technical field to which the present invention pertains, various changes can be made without departing from the gist of the present invention.

Claims

1. A heat recovery drying equipment, characterized in that: include: A preheating chamber provided with a plurality of vents; A drying room, separated from the preheating room; An air intake assembly, which connects the preheating chamber and the drying room, and the air intake assembly is activated to allow the gas in the preheating chamber to enter the drying room; A dehumidification pipe connected to the drying room, the dehumidification pipe is provided with a heat exchange section, the heat exchange section is arranged in the preheating chamber, and the heat exchange section is provided with a dehumidification hole; A dehumidification fan is arranged in the dehumidification pipe, and after the dehumidification fan is started, the gas in the drying room enters the dehumidification pipe; A first humidity sensor is provided in the drying room to measure a first humidity of the drying room; The controller is configured to: when the first humidity is greater than a preset humidity, the controller controls the air intake component and the dehumidification fan to start.

2. The heat recovery drying equipment according to claim 1, characterized in that: The heat exchange section spirally extends from bottom to top around a vertical axis, and the air intake assembly is connected to the top of the preheating chamber.

3. The heat recovery drying equipment according to claim 2, characterized in that: The moisture discharge holes are multiple, and the heat recovery drying equipment also includes: A plurality of dehumidification valves, wherein the plurality of dehumidification valves are arranged in a one-to-one correspondence with the plurality of dehumidification holes; The controller is further configured to: when the first humidity is greater than the preset humidity, the controller controls the dehumidification valve to open in a quantity proportional to the magnitude of the first humidity.

4. The heat recovery drying equipment according to claim 2, characterized in that: The number of the vent holes decreases gradually from bottom to top.

5. The heat recovery drying equipment according to claim 2, characterized in that: A heat exchange element is arranged on the side wall of the heat exchange section.

6. The heat recovery drying equipment according to claim 2, characterized in that: A drainage hole is provided at the bottom of the preheating chamber.

7. The heat recovery drying equipment according to claim 1, characterized in that: The heat recovery drying equipment also includes: A second humidity sensor is disposed in the preheating chamber and measures a second humidity in the preheating chamber; The controller is also configured to: when the second humidity is greater than the first humidity, the controller controls the air intake assembly to close and controls the moisture removal fan to start.

8. The heat recovery drying equipment according to claim 7, characterized in that: The heat recovery drying equipment also includes: A ventilation component is arranged in the preheating chamber, and after the ventilation component is started, the gas in the preheating chamber is discharged to the outside; The controller is further configured to control the ventilation component to start when the second humidity is greater than the preset humidity.

9. The heat recovery drying equipment according to claim 1, characterized in that: The dehumidification pipe is also provided with a conveying section, and the conveying section is arranged between the drying room and the preheating chamber, and a heat-insulating layer is arranged on the side wall of the conveying section.

10. The heat recovery drying equipment according to claim 1, characterized in that: The heat recovery drying equipment also includes: A heat pump drying device is connected to the drying room, and the refrigerant of the heat pump drying device is carbon dioxide.

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