Fresh air energy-saving dehumidifier and control method thereof

Abstract

The invention relates to the field of dehumidifiers, in particular to a fresh air energy-saving dehumidifier and a control method thereof.The fresh air energy-saving dehumidifier comprises a controller, a fresh air EC draught fan, a front rotating wheel, a rear rotating wheel, a first pressure difference sensor, a first-stage regeneration EC draught fan and a second-stage regeneration EC draught fan, and the dehumidifier is sequentially divided into a fresh air duct, an air return duct and a regeneration air duct in the air supply direction; the front rotating wheel comprises a front treatment area and a front regeneration area, and the rear rotating wheel comprises a rear treatment area, a cold blowing area and a rear regeneration area; a fresh air EC fan, a pre-treatment area and a post-treatment area are sequentially arranged in the fresh air duct in the air supply direction; a cold blowing area, a rear regeneration area, a first-stage regeneration EC fan, a front regeneration area and a second-stage regeneration EC fan are sequentially arranged in the regeneration air duct in the air supply direction. A plurality of first differential pressure sensors are arranged; the fresh air volume required by the workshop can be rapidly and accurately judged, the fresh air EC fan is automatically and steplessly adjusted to optimize the fresh air volume of the dehumidifier to adapt to the workshop requirement, and the operation energy consumption of a unit is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of dehumidifiers, and more particularly to a fresh air energy-saving dehumidifier and its control method. Background Technology

[0002] Rotary dehumidifiers provide a stable low-humidity environment for manufacturing workshops and are widely used in industries such as food, pharmaceuticals, bridges, military, aerospace, and lithium batteries.

[0003] The energy consumption of a dehumidifier is mainly used to dehumidify fresh air. Optimizing and reducing the fresh air volume can save a lot of energy for the dehumidifier.

[0004] The composition of the fresh air volume in the drying workshop is determined by comprehensively considering factors such as the hygiene requirements of workshop personnel, positive pressure requirements, and process exhaust requirements. The fresh air volume of the rotary dehumidifier is determined by comprehensively considering the fresh air volume of the drying workshop and the dehumidifier's own regeneration exhaust requirements.

[0005] Personnel hygiene requirements are the basic fresh air volume requirements to ensure the oxygen content of the air. Factory workshops usually take 30m3 / (h.person) as the value.

[0006] Positive pressure is required to ensure that the workshop pressure is higher than the outdoor pressure, preventing outdoor pollutants from leaking into the workshop. Positive pressure fresh air volume is typically calculated as follows: 0-5 Pa positive pressure, 1.5-2 air changes per hour; 5-10 Pa positive pressure, 2-4 air changes per hour. The ability of a workshop to maintain positive pressure is often related to the airtightness of its enclosure structure.

[0007] The process exhaust ventilation requirement is the amount of fresh air needed to replenish the pollutants discharged from the workshop. It is set according to the equipment exhaust ventilation requirements, and the actual operation will be adjusted according to changes in production capacity.

[0008] The combined fresh air volume of the three air volumes is relatively high and varies during operation, requiring further optimization to reduce its volume. After the rotary dehumidifier reaches the required supply air temperature and dew point during initial commissioning, maintenance personnel typically avoid adjusting the dehumidifier's air volume to prevent instability and production disruptions caused by adjustments. Even when adjustments are made, they are usually minor manual adjustments.

[0009] Considering all the above factors, there is a long-term mismatch between the effective fresh air volume of the dehumidifier (the fresh air volume delivered to the workshop) and the fresh air volume required by the workshop (i.e., the actual fresh air volume of the dehumidifier is too high), resulting in a large amount of energy waste. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a dehumidifier and its control method that can adapt and adjust the fresh air volume required by the workshop to reduce the energy consumption of the unit.

[0011] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a fresh air energy-saving dehumidifier, including a controller, a fresh air EC fan, a front impeller, a rear impeller, a first differential pressure sensor, a first-stage regeneration EC fan and a second-stage regeneration EC fan. The dehumidifier is divided into a fresh air duct, a return air duct and a regeneration air duct in sequence along the air supply direction. The air outlet of the fresh air duct is connected to the workshop to be dehumidified, the air inlet of the return air duct is connected to the workshop to be dehumidified, and the air outlet of the return air duct and the air inlet of the regeneration air duct are sequentially connected to the fresh air duct. The front impeller includes a pre-treatment zone and a pre-regeneration zone, and the rear impeller includes a post-treatment zone, a cold blowing zone, and a post-regeneration zone; A fresh air EC fan, a pre-treatment area, and a post-treatment area are arranged sequentially along the air supply direction within the fresh air duct. Within the regenerated air duct, a cold blowing zone, a post-regeneration zone, a primary regeneration EC fan, a pre-regeneration zone, and a secondary regeneration EC fan are arranged sequentially along the air supply direction. Multiple first differential pressure sensors are installed and arranged at intervals in the workshop to be dehumidified; The controller is electrically connected to the fresh air EC fan, the front impeller, the rear impeller, the first differential pressure sensor, the primary regeneration EC fan, and the secondary regeneration EC fan.

[0012] It also includes a control method for a fresh air energy-saving dehumidifier, applied to the aforementioned dehumidifier, the steps of which are as follows: Step 1: The first differential pressure sensor, which is pre-installed in the dehumidification workshop, detects the positive pressure difference between the workshop and the adjacent workshop, and transmits the workshop differential pressure signal to the controller for information processing. Step 2: Calculate the average value of each detection data based on the detection data of the first differential pressure sensor preset in the dehumidification workshop, and compare it with the differential pressure range set in the workshop; When the average value of each detection data approaches the upper limit of the above differential pressure range, the controller will control and reduce the frequency and air volume of the fresh air EC fan; When the average value of each differential pressure data approaches the lower limit of the above differential pressure range, the controller will control and increase the frequency and air volume of the fresh air EC fan.

[0013] The beneficial effects of this invention are as follows: By adopting a fresh air EC fan, the fresh air volume can be precisely adjusted. During adjustment, the EC fan supports stepless speed regulation from 0% to 100%, exhibiting strong linear control capabilities. It can precisely adjust the air volume based on feedback from the workshop's first differential pressure sensor. Through the cooperation of the aforementioned first differential pressure sensor and controller, the required fresh air volume of the workshop can be quickly and accurately determined, and the fresh air EC fan can be automatically and steplessly adjusted to optimize the dehumidifier's fresh air volume to meet the workshop's needs. Simultaneously, the stepless adjustment of the primary and secondary regeneration EC fans optimizes the regeneration air volume, effectively reducing the unit's operating energy consumption. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a fresh air energy-saving dehumidifier according to a specific embodiment of the present invention; Figure 2 The front view of the fresh air EC air wall of the fresh air energy-saving dehumidifier according to a specific embodiment of the present invention; Figure 3 This is a side view of the fresh air EC air wall of the fresh air energy-saving dehumidifier according to a specific embodiment of the present invention; Label Explanation: 1. Fresh air duct; 2. Return air duct; 3. Regenerated air duct; 4. Makeup air duct; 5. Fresh air EC wall; 51. Fresh air EC fan; 52. Partition; 53. Ventilation vent; 54. Second differential pressure sensor; 6. Supply air EC wall; 7. Front impeller; 71. Pre-treatment zone; 72. Front regeneration zone; 8. Rear impeller; 81. Post-treatment zone; 82. Cold blowing zone; 83. Post-regeneration zone; 9. First differential pressure sensor; 10. Primary regeneration EC fan; 11. Secondary regeneration EC fan; 12. First air valve; 13. Primary filter; 14. Front surface cooler; 15. Second air valve; 16. Middle surface cooler; 17. Medium-efficiency filter; 18. Rear surface cooler; 19. Dew point meter; 110. Third air valve; 111. Fourth air valve; 112. Primary regeneration heater; 113. Fifth air valve; 114. Secondary regeneration heater. Detailed Implementation

[0015] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0016] Please refer to Figure 1 A fresh air energy-saving dehumidifier includes a controller, a fresh air EC fan 51, a front impeller 7, a rear impeller 8, a first differential pressure sensor 9, a primary regeneration EC fan 10, and a secondary regeneration EC fan 11. The dehumidifier is divided into a fresh air duct 1, a return air duct 2, and a regeneration air duct 3 along the air supply direction. The air outlet of the fresh air duct 1 is connected to the workshop to be dehumidified, the air inlet of the return air duct 2 is connected to the workshop to be dehumidified, and the air outlet of the return air duct 2 and the air inlet of the regeneration air duct are connected to the fresh air duct 1 in sequence. The front impeller 7 includes a pre-treatment zone 71 and a front regeneration zone 72, and the rear impeller 8 includes a post-treatment zone 81, a cold blowing zone 82, and a post-regeneration zone 83; A fresh air EC fan 51, a pre-treatment zone 71, and a post-treatment zone 81 are arranged sequentially along the air supply direction in the fresh air duct 1. Within the regenerated air duct 3, a cold blowing zone 82, a post-regeneration zone 83, a primary regeneration EC fan 10, a pre-regeneration zone 72, and a secondary regeneration EC fan 11 are arranged sequentially along the air supply direction. Multiple first differential pressure sensors 9 are provided and arranged at intervals in the workshop to be dehumidified; The controller is electrically connected to the fresh air EC fan 51, the front impeller 7, the rear impeller 8, the first differential pressure sensor 9, the primary regeneration EC fan 10, and the secondary regeneration EC fan 11.

[0017] As can be seen from the above description, the beneficial effects of the present invention are as follows: By adopting the fresh air EC fan 51, the fresh air volume can be precisely adjusted. During adjustment, based on the EC fan's support for stepless speed regulation from 0% to 100% and its strong linear control capability, the air volume can be precisely adjusted according to the feedback signal from the first differential pressure sensor 9 in the workshop. Through the cooperation of the first differential pressure sensor 9 and the controller, the required fresh air volume in the workshop can be quickly and accurately determined, and the fresh air EC fan 51 can be automatically and steplessly adjusted to optimize the fresh air volume of the dehumidifier to meet the workshop's needs. Simultaneously, the stepless adjustment of the primary regeneration EC fan 10 and the secondary regeneration EC fan 11 optimizes the regeneration air volume, effectively reducing the unit's operating energy consumption.

[0018] Furthermore, such as Figure 2 As shown, it also includes a fresh air EC air wall 5, which includes the aforementioned multiple fresh air EC fans 51, a partition 52, and a second differential pressure sensor 54 arranged corresponding to each fresh air EC fan 51. Multiple fresh air EC fans 51 are arranged in an array on the partition 52, and the second differential pressure sensor 54 is electrically connected to the fresh air EC fan 51.

[0019] As described above, by using the fresh air EC air wall 5, multiple fresh air EC fans 51 can be configured on the partition 52 to achieve a large-scale air volume control. The corresponding second differential pressure sensor 54 is used to calculate the air volume, current, power and other parameters of the corresponding fan for subsequent control adjustment.

[0020] Furthermore, such as Figure 3 As shown, the partition 52 is provided with a ventilation throat 53 corresponding to the fresh air EC fan 51. The fresh air EC fan 51 is connected to the ventilation throat 53, and the sensing end of the second differential pressure sensor 54 is arranged inside the ventilation throat 53.

[0021] As described above, the airflow is controlled by the arrangement of the ventilation throat 53, and the second differential pressure sensor 54 senses the differential pressure at that location by the arrangement of its sensing end within the ventilation throat 53.

[0022] Furthermore, such as Figure 1 As shown, it also includes an air supply EC wall 6, which is located in the fresh air duct 1 and between the pretreatment zone 71 and the posttreatment zone 81. The air supply EC wall 6 includes multiple air supply EC fans, which are electrically connected to the controller.

[0023] As described above, the design of the EC air wall 6 is intended to provide air supply power and sufficient air volume.

[0024] Furthermore, such as Figure 1 As shown, it also includes a makeup air duct 4, which is connected to the regeneration air duct and is located between the post-regeneration zone 83 and the pre-regeneration zone 72.

[0025] As can be seen from the above description, the design of the supplementary air duct 4 can introduce outside air into the regeneration air duct to reduce the workload of the front impeller 7 and related components in processing the air in the air duct, thereby reducing energy consumption.

[0026] Furthermore, such as Figure 1 As shown, it also includes a dew point meter 19, which is connected to the fresh air duct 1 and is located between the post-treatment area 81 and the workshop to be dehumidified. The dew point meter 19 is electrically connected to the controller.

[0027] As described above, the dew point meter 19 is used to detect the dew point of the air flowing into the dehumidification workshop from the fresh air duct 1. If the dew point does not meet the requirements, the processing of the pre-processor is controlled to make the dew point meet the standard.

[0028] A control method for a fresh air energy-saving dehumidifier, applied to the aforementioned dehumidifier, comprises the following steps: Step 1: The first differential pressure sensor 9, which is pre-installed in the dehumidification workshop, detects the positive pressure difference between the workshop and the adjacent workshop, and transmits the workshop differential pressure signal to the controller for information processing. Step 2: Calculate the average value of each detection data based on the detection data of the first differential pressure sensor 9 preset in the dehumidification workshop, and compare it with the differential pressure range set in the workshop. When the average value of each detection data approaches the upper limit of the above differential pressure range, the controller will control and reduce the frequency and air volume of the fresh air EC fan 51; When the average value of each differential pressure data approaches the lower limit of the above differential pressure range, the controller will control and increase the frequency and air volume of the fresh air EC fan 51; The controller specifically controls the frequency and air volume of the fresh air EC fan 51 as follows: The actual average pressure difference in the room, i.e., the average value of all measured data, is denoted as P; the frequency is f, and the range of f is 0~50HZ. Then the actual average pressure difference P, the upper and lower limit pressure difference P 下 P 上 The relationship with frequency f can be expressed by a formula: P=P 下 +(P 上 -P 下 ) / 50*f; When the frequency f changes, the air volume of the corresponding fan also changes synchronously according to the performance of the fan used. The specific relationship between the air volume and the frequency f is determined according to the performance of the fan used. The upper and lower limit pressure difference P 下 P 上 The pressure difference ΔP is divided into 3 segments, and the pressure difference values ​​of the three segments are respectively P 下 +(P 上 -P 下 ) / 3、P 下 +2*(P 上 -P 下 ) / 3、P 下 +(P 上 -P 下 ), When P 下 +2*(P 上 -P 下 ) / 3≤P≤P 下 +(P 上 -P 下 When the average value P of each detection data is close to the upper limit of the above differential pressure range, the controller will control and reduce the frequency and air volume of the fresh air EC fan. The controller adjustment logic obtains the required adjustment of the frequency and air volume of the fresh air EC fan according to the above formula and executes it. When P 下 +2*(P 上 -P 下 ) / 3<P<P 下 +(P 上 -P 下 When the average value of each detection data approaches the equilibrium value, the frequency and air volume of the controller and the fresh air EC fan will not be adjusted. When P 下 ≤P≤P 下 +(P 上 -P 下 When the average value of each differential pressure data is close to the lower limit of the above differential pressure range, the controller will control and increase the frequency and air volume of the fresh air EC fan. The controller adjustment logic obtains the required adjustment of the frequency and air volume of the fresh air EC fan according to the above formula and executes it.

[0029] As described above, the first differential pressure sensor 9 detects the differential pressure inside the workshop so that the controller can accurately adjust the operating parameters of the fresh air EC fan 51 to increase or decrease the fresh air volume after processing the differential pressure range and averaging the values.

[0030] Furthermore, step two also includes the following steps: The imbalance rate of each monitoring data is calculated based on the detection data of the first differential pressure sensor 9 preset in the dehumidification workshop. The imbalance rate is obtained by dividing the deviation from the average differential pressure data by the average differential pressure data. When the above imbalance rate exceeds 15%, the controller will issue an alarm.

[0031] As described above, when the controller detects an imbalance rate higher than 15%, there may be a equipment malfunction, and an alarm can be triggered to notify the relevant maintenance personnel to take action.

[0032] Furthermore, step two also includes the following steps: When the air volume of the fresh air EC fan 51 increases, the controller adjusts the temperature of the pre-regeneration zone 72 to rise.

[0033] As described above, when the air volume of the fresh air EC fan 51 increases, the air volume processed by the front impeller 7 will increase, the dew point processed by the front impeller will rise, and the supply air dew point Tdp will rise accordingly, making it impossible to meet the supply air demand. Therefore, the above situation can be avoided by adjusting the temperature of the front regeneration zone 72 by increasing it.

[0034] Furthermore, step two also includes the following steps: when the air volume of the fresh air EC fan 51 increases, the controller adjusts the frequency and air volume of the secondary regeneration EC to increase.

[0035] As described above, when the air volume of the fresh air EC fan 51 increases, the air volume handled by the front impeller 7 will increase, the dew point handled by the front impeller will rise, and the supply air dew point Tdp will rise accordingly, making it impossible to meet the supply air demand. Therefore, the above situation can be avoided by increasing and adjusting the frequency and air volume of the secondary regenerator EC.

[0036] Example 1: like Figure 1 As shown, a fresh air energy-saving dehumidifier includes a controller, a fresh air EC wall 5, a supply air EC wall 6, a front impeller 7, a rear impeller 8, a first differential pressure sensor 9, a primary regeneration EC fan 10, a secondary regeneration EC fan 11, a first air valve 12, a pre-filter 13, a front surface cooler 14, a second air valve 15, a middle surface cooler 16, a medium-efficiency filter 17, a rear surface cooler 18, a dew point meter 19, a third air valve 110, a fourth air valve 111, a primary regeneration heater 112, a fifth air valve 113, and a secondary regeneration heater 114.

[0037] The dehumidifier is divided into fresh air duct 1, return air duct 2, regeneration air duct 3 and makeup air duct 4 along the air supply direction.

[0038] The outlet of the fresh air duct 1 is connected to the workshop to be dehumidified, the inlet of the return air duct 2 is connected to the workshop to be dehumidified, and the outlet of the return air duct 2 and the inlet of the regeneration air duct are connected to the fresh air duct 1 in sequence; the makeup air duct 4 is connected to the regeneration air duct.

[0039] The front impeller 7 includes a pre-treatment zone 71 and a front regeneration zone 72, and the rear impeller 8 includes a post-treatment zone 81, a cold blowing zone 82, and a post-regeneration zone 83; The following components are arranged sequentially along the air supply direction in the fresh air duct 1: first air valve 12, primary filter 13, fresh air EC air wall 5, front surface cooler 14, pretreatment zone 71, supply air EC air wall 6, middle surface cooler 16, medium-efficiency filter 17, post-treatment zone 81, post-surface cooler 18, dew point meter 19, and second air valve 15. A third air valve 110 is arranged in the return air duct 2. The air outlet of the return air duct 2 is connected to the fresh air duct 1 between the pretreatment area 71 and the supply air EC wall 6.

[0040] The regeneration air duct 3 is arranged in sequence along the air supply direction, including a fourth air valve 111, a cold blowing zone 82, a primary regeneration heater 112, a post-regeneration zone 83, a primary regeneration EC fan 10, a secondary regeneration heater 114, a pre-regeneration zone 72, and a secondary regeneration EC fan 11.

[0041] The make-up air duct 4 is equipped with a fifth air valve 113, and the air outlet of the make-up air duct 4 is connected between the primary regeneration EC fan 10 and the secondary regeneration heater 114.

[0042] like Figure 2 and Figure 3 As shown, the fresh air EC air wall 5 includes multiple fresh air EC fans 51, a partition 52, and a second differential pressure sensor 54 arranged corresponding to each fresh air EC fan 51. Multiple ventilation vents 53 and multiple fresh air EC fans 51 are arranged in an array on the partition 52. The second differential pressure sensor 54 is electrically connected to the fresh air EC fan 51.

[0043] Correspondingly, the air supply EC wall 6 is also formed by a combination of multiple EC fans, baffles 52, and differential pressure sensors.

[0044] The fresh air EC wall 5, supply air EC wall 6, front impeller 7, rear impeller 8, first differential pressure sensor 9, primary regeneration EC fan 10, secondary regeneration EC fan 11, first air valve 12, primary filter 13, front surface cooler 14, second air valve 15, middle surface cooler 16, medium-efficiency filter 17, rear surface cooler 18, dew point meter 19, third air valve 110, fourth air valve 111, primary regeneration heater 112, fifth air valve 113, and secondary regeneration heater 114 are all electrically connected to the controller for precise control.

[0045] The aforementioned front surface cooler 14, middle surface cooler 16, and rear surface cooler 18 are all used to cool the air.

[0046] The aforementioned fresh air EC wall 5, supply air EC wall 6, primary regeneration EC fan 10, and secondary regeneration EC fan 11 The first air valve 12, the second air valve 15, the third air valve 110, the fourth air valve 111 and the fifth air valve 113 mentioned above are used to regulate the air volume.

[0047] The aforementioned pre-filter 13 and medium-efficiency filter 17 are used to filter air to meet cleanliness requirements.

[0048] After the fresh air is controlled by the fresh air EC air wall 5, the power and air volume are controlled. The saturated air obtained by the front surface cooler 14 has a temperature of 12~15℃ and 100% humidity (corresponding to a moisture content of 8.8~10.7g / kg). Then it enters the pretreatment zone 71 of the front rotor 7 for adsorption, dehydration and dehumidification. Then, powered by the supply air EC wall 6, the air is cooled to the preset temperature (usually 12~15℃) by the middle surface cooler 16, and then enters the post-treatment zone 81 of the rear rotor 8 for deep dehumidification to meet the preset dew point requirements; then it is cooled to the supply air temperature requirements (12~15℃) by the rear surface cooler 18 and sent into the workshop.

[0049] The regenerated air is taken from the dry air behind the supply air EC wall 6. It is powered and controlled by the secondary regenerated EC fan 11. After heat recovery in the cold blowing zone 82 of the rear rotor 8, it enters the primary regenerated heater 112 and is heated to the preset temperature before entering the post-regeneration zone 83 of the rear rotor 8. The regenerated exhaust air from the rear rotor 8 is mixed with the outdoor makeup air. The air volume is powered and controlled by the primary regenerated EC fan 10. The air is heated to the preset temperature by the primary regenerated heater 112 and then desorbed in the pre-regeneration zone 72 of the front rotor 7 before being discharged outdoors.

[0050] Example 2 A control method for a fresh air energy-saving dehumidifier, applied to the dehumidifier of Example 1, includes the following steps: Step 1: The first differential pressure sensor 9, which is pre-installed in the dehumidification workshop, detects the positive pressure difference between the workshop and the adjacent workshop, and transmits the workshop differential pressure signal to the controller for information processing. Step 2: Calculate the average value of each detection data based on the detection data of the first differential pressure sensor 9 preset in the dehumidification workshop, and compare it with the differential pressure range set in the workshop. When the average value of each detection data approaches the upper limit of the above differential pressure range, the controller will control and reduce the frequency and air volume of the fresh air EC fan 51; When the average value of each differential pressure data approaches the lower limit of the above differential pressure range, the controller will control and increase the frequency and air volume of the fresh air EC fan 51.

[0051] The controller specifically controls the frequency and air volume of the fresh air EC fan 51 as follows: The pressure differential is typically set within the range of 5 to 10 Pa, with the lower limit P being... 下 The pressure difference is 5 Pa, and the upper limit pressure difference P 上 The value is 10 Pa; the actual average pressure difference in the room, i.e., the average value of all measured data, is P; the frequency is f, and the range of f is 0~50HZ. Then the actual average pressure difference P, the upper and lower limit pressure difference P 下 P 上 The relationship with frequency f can be expressed by a formula: P=P 下 +(P 上 -P 下 ) / 50*f; When the frequency f changes, the air volume of the corresponding fan also changes synchronously according to the performance of the fan used. The specific relationship between the air volume and the frequency f is determined according to the performance of the fan used. The upper and lower limit pressure difference P 下 P 上 The pressure difference ΔP is divided into 3 segments, and the pressure difference values ​​of the three segments are respectively P 下 +(P 上 -P 下 ) / 3、P 下 +2*(P 上 -P 下 ) / 3、P 下 +(P 上 -P 下 ), When P 下 +2*(P 上 -P 下 ) / 3≤P≤P 下 +(P 上 -P 下 When the average value P of each detection data is close to the upper limit of the above differential pressure range, the controller controls and reduces the frequency and air volume of the fresh air EC fan 51. The controller adjustment logic obtains the required adjustment of the frequency and air volume of the fresh air EC fan 51 according to the above formula and executes it. When P 下 +2*(P 上 -P 下 ) / 3<P<P 下 +(P 上 -P 下 When the average value of each detection data approaches the equilibrium value, the frequency and air volume of the controller and the fresh air EC fan 51 will not be adjusted. When P 下 ≤P≤P 下+(P 上 -P 下 When the average value of each differential pressure data is close to the lower limit of the above differential pressure range, the controller controls and increases the frequency and air volume of the fresh air EC fan 51. The controller adjustment logic obtains the required adjustment of the frequency and air volume of the fresh air EC fan 51 according to the above formula and executes it.

[0052] When the air volume of the fresh air EC fan 51 increases, the controller adjusts the temperature of the pre-regeneration zone 72 to increase or adjusts the frequency and air volume of the secondary regeneration EC to increase, adjusting according to the required energy consumption to select a more energy-efficient operation.

[0053] The imbalance rate of each monitoring data is calculated based on the detection data of the first differential pressure sensor 9 preset in the dehumidification workshop. The imbalance rate is obtained by dividing the deviation from the average differential pressure data by the average differential pressure data. When the above imbalance rate exceeds 15%, the controller will issue an alarm.

[0054] In summary, the energy-saving dehumidifier and its control method provided by this invention, by employing a fresh air EC fan, can precisely adjust the fresh air volume. During adjustment, the EC fan supports stepless speed regulation from 0% to 100%, exhibiting strong linear control capabilities. It can precisely adjust the air volume based on feedback from the workshop's first differential pressure sensor. Through the cooperation of the aforementioned first differential pressure sensor and controller, the required fresh air volume of the workshop is quickly and accurately determined, and the fresh air EC fan is automatically and steplessly adjusted to optimize the dehumidifier's fresh air volume to meet the workshop's needs. Simultaneously, the stepless adjustment of the primary and secondary regeneration EC fans optimizes the regeneration air volume, effectively reducing the unit's operating energy consumption.

[0055] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A fresh air energy-saving dehumidifier, characterized in that, The dehumidifier includes a controller, a fresh air EC fan, a front impeller, a rear impeller, a first differential pressure sensor, a first-stage regeneration EC fan, and a second-stage regeneration EC fan. The dehumidifier is divided into a fresh air duct, a return air duct, and a regeneration air duct along the air supply direction. The outlet of the fresh air duct is connected to the workshop to be dehumidified, the inlet of the return air duct is connected to the workshop to be dehumidified, and the outlet of the return air duct and the inlet of the regeneration air duct are connected to the fresh air duct in sequence. The front impeller includes a pre-treatment zone and a pre-regeneration zone, and the rear impeller includes a post-treatment zone, a cold blowing zone, and a post-regeneration zone; A fresh air EC fan, a pre-treatment area, and a post-treatment area are arranged sequentially along the air supply direction within the fresh air duct. Within the regenerated air duct, a cold blowing zone, a post-regeneration zone, a primary regeneration EC fan, a pre-regeneration zone, and a secondary regeneration EC fan are arranged sequentially along the air supply direction. Multiple first differential pressure sensors are installed and arranged at intervals in the workshop to be dehumidified; The controller is electrically connected to the fresh air EC fan, the front impeller, the rear impeller, the first differential pressure sensor, the primary regeneration EC fan, and the secondary regeneration EC fan.

2. The fresh air energy-saving dehumidifier according to claim 1, characterized in that, It also includes a fresh air EC air wall, which includes the aforementioned multiple fresh air EC fans, a partition, and a second differential pressure sensor arranged corresponding to each fresh air EC fan. Multiple fresh air EC fans are arranged in an array on the partition, and the second differential pressure sensor is electrically connected to the fresh air EC fan.

3. The fresh air energy-saving dehumidifier according to claim 2, characterized in that, The partition plate is provided with a ventilation throat corresponding to the fresh air EC fan. The fresh air EC fan is connected to the ventilation throat, and the sensing end of the second differential pressure sensor is arranged inside the ventilation throat.

4. The fresh air energy-saving dehumidifier according to claim 1, characterized in that, It also includes an EC air wall for air supply, which is located in the fresh air duct and between the pre-treatment area and the post-treatment area. The EC air wall for air supply includes multiple EC fans, which are electrically connected to the controller.

5. The fresh air energy-saving dehumidifier according to claim 1, characterized in that, It also includes a makeup air duct, which is connected to the regeneration air duct and is located between the post-regeneration zone and the pre-regeneration zone.

6. The fresh air energy-saving dehumidifier according to claim 1, characterized in that, It also includes a dew point meter, which is connected to the fresh air duct and is located between the post-treatment area and the workshop to be dehumidified. The dew point meter is electrically connected to the controller.

7. A control method for a fresh air energy-saving dehumidifier, characterized in that, When applied to the dehumidifier according to any one of claims 1 to 6, the steps are as follows: Step 1: The first differential pressure sensor, which is pre-installed in the dehumidification workshop, detects the positive pressure difference between the workshop and the adjacent workshop, and transmits the workshop differential pressure signal to the controller for information processing. Step 2: Calculate the average value of each detection data based on the detection data of the first differential pressure sensor preset in the dehumidification workshop, and compare it with the differential pressure range set in the workshop; When the average value of each detection data approaches the upper limit of the above differential pressure range, the controller will control and reduce the frequency of the fresh air EC fan; When the average value of each differential pressure data approaches the lower limit of the above differential pressure range, the controller will control and increase the frequency of the fresh air EC fan; The controller specifically controls the frequency and air volume of the fresh air EC fan as follows: The actual average pressure difference in the room, i.e., the average value of all measured data, is denoted as P; the frequency is f, and the range of f is 0~50HZ. Then the actual average pressure difference P, the upper and lower limit pressure difference P 下 P 上 The relationship with frequency f can be expressed by a formula: P=P 下 +(P 上 -P 下 ) / 50*f; When the frequency f changes, the air volume of the corresponding fan also changes synchronously according to the performance of the fan used. The specific relationship between the air volume and the frequency f is determined according to the performance of the fan used. The upper and lower limit pressure difference P 下 P 上 The pressure difference ΔP is divided into 3 segments, and the pressure difference values ​​of the three segments are respectively P 下 +(P 上 -P 下 ) / 3、P 下 +2*(P 上 -P 下 ) / 3、P 下 +(P 上 -P 下 ), When P 下 +2*(P 上 -P 下 ) / 3≤P≤P 下 +(P 上 -P 下 When the average value P of each detection data is close to the upper limit of the above differential pressure range, the controller will control and reduce the frequency and air volume of the fresh air EC fan. The controller adjustment logic obtains the required adjustment of the frequency and air volume of the fresh air EC fan according to the above formula and executes it. When P 下 +2*(P 上 -P 下 ) / 3<P<P 下 +(P 上 -P 下 When the average value of each detection data approaches the equilibrium value, the frequency and air volume of the controller and the fresh air EC fan will not be adjusted. When P 下 ≤P≤P 下 +(P 上 -P 下 When the average value of each differential pressure data is close to the lower limit of the above differential pressure range, the controller will control and increase the frequency and air volume of the fresh air EC fan. The controller adjustment logic obtains the required adjustment of the frequency and air volume of the fresh air EC fan according to the above formula and executes it.

8. The control method for the fresh air energy-saving dehumidifier according to claim 7, characterized in that, Step two also includes the following steps: The imbalance rate of each monitoring data is calculated based on the detection data of the first differential pressure sensor preset in the dehumidification workshop. The imbalance rate is obtained by dividing the deviation from the average differential pressure data by the average differential pressure data. When the above imbalance rate exceeds 15%, the controller will issue an alarm.

9. The control method for the fresh air energy-saving dehumidifier according to claim 7, characterized in that, Step two also includes the following steps: When the air volume of the fresh air EC fan increases, the controller adjusts the temperature of the pre-regeneration zone to rise.

10. The control method for the fresh air energy-saving dehumidifier according to claim 7, characterized in that, Step two also includes the following steps: when the air volume of the fresh air EC fan increases, the controller adjusts the frequency and air volume of the secondary regeneration EC to increase.

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