Dehumidifier

Abstract

The present invention discloses a dehumidifier comprising: a refrigerant circuit in which a refrigerant circulates between a compressor, a condenser, a throttling member and an evaporator in order; the temperature sensor is arranged on the evaporator, and a user obtains the current indoor relative temperature; the humidity sensor is arranged on the evaporator and used for obtaining the current indoor environment humidity; the controller is connected with the temperature sensor and the humidity sensor, and the controller is configured to obtain the current indoor relative humidity and the current indoor environment temperature; and overheating protection is conducted on the compressor according to the current indoor relative humidity and the current indoor environment temperature. According to the dehumidifier, extra cost does not need to be increased, overheating protection can be conducted on the compressor based on existing configuration, normal operation of the dehumidifier is guaranteed, and the use experience of a user is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of dehumidifier technology, and in particular to a dehumidifier. Background Technology

[0002] Due to changes in dehumidifier standards, the maximum load test conditions for dehumidifiers have become more stringent, involving high temperature and high humidity environments. Existing dehumidifiers may experience shutdowns or excessive exhaust temperatures under these new conditions. While existing technologies can improve dehumidifier operation by adding features, this increases operating costs. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide a dehumidifier that, without incurring additional costs, can provide overheat protection for the compressor based on existing configurations, ensuring the normal operation of the dehumidifier and guaranteeing the user experience.

[0004] To address the aforementioned problems, a first aspect of the present invention provides a dehumidifier, comprising: a refrigerant circuit in which refrigerant circulates sequentially between a compressor, a condenser, a throttling device, and an evaporator; a temperature sensor disposed on the evaporator for acquiring the current indoor ambient temperature; a humidity sensor disposed on the evaporator for acquiring the current indoor relative humidity; and a controller connected to the temperature sensor and the humidity sensor, the controller being configured to: acquire the current indoor relative humidity and the current indoor ambient temperature; and perform overheat protection on the compressor based on the current indoor relative humidity and the current indoor ambient temperature.

[0005] According to the embodiments of the present invention, the dehumidifier does not require additional hardware configuration. It uses temperature and humidity sensors to monitor the working environment of the dehumidifier to determine whether the dehumidifier will shut down due to compressor overheating. When there is a risk of the dehumidifier shutting down, it provides overheat protection for the compressor. Thus, without increasing the cost of using the dehumidifier, it provides overheat protection for the compressor based on the existing configuration, ensuring the normal operation of the dehumidifier and protecting the user experience.

[0006] In some embodiments, for overheat protection of the compressor based on the current indoor relative humidity and the current indoor ambient temperature, the controller is specifically configured to periodically perform overheat protection of the compressor based on the current indoor relative humidity and the current indoor ambient temperature.

[0007] In some embodiments, for periodically protecting the compressor from overheating based on the current indoor relative humidity and the current indoor ambient temperature, the controller is specifically configured to perform the following steps in each cycle: obtaining a correlation between changes in indoor ambient temperature, indoor relative humidity, and exhaust temperature, wherein the correlation is obtained based on testing the dehumidifier under different temperature and humidity conditions; determining a humidity protection threshold corresponding to different indoor ambient temperatures based on the correlation; determining a target humidity protection threshold based on the correlation, the humidity protection threshold, and the current indoor ambient temperature; and protecting the compressor from overheating based on the current indoor relative humidity and the target humidity protection threshold.

[0008] In some embodiments, the humidity protection threshold is a target indoor relative humidity; wherein, the target indoor relative humidity is the indoor relative humidity corresponding to the exhaust temperature critical value at the indoor ambient temperature in the change correspondence, and the exhaust temperature critical value is the exhaust temperature at which the compressor is not triggered to perform overheat protection.

[0009] In some embodiments, the humidity protection threshold is the difference between the target indoor relative humidity and a preset allowable error; wherein, the target indoor relative humidity is the indoor relative humidity corresponding to the exhaust temperature critical value at the indoor ambient temperature in the change correspondence, and the exhaust temperature critical value is the exhaust temperature at which the compressor is not triggered to perform overheat protection.

[0010] In some embodiments, when the change correspondence is obtained by testing, multiple indoor ambient temperatures are generated with a preset value as a step size. For determining the target humidity protection threshold based on the change correspondence, the humidity protection threshold, and the current indoor ambient temperature, the controller is specifically configured to: determine that the current indoor ambient temperature is greater than a first indoor ambient temperature and less than or equal to a second indoor ambient temperature based on the multiple indoor ambient temperatures in the change correspondence; and determine the target humidity protection threshold based on the humidity protection threshold corresponding to the second indoor ambient temperature.

[0011] In some embodiments, the target humidity protection threshold is the humidity protection threshold corresponding to the second indoor ambient temperature, or the target humidity protection value is the sum of the humidity protection threshold corresponding to the second indoor ambient temperature and a preset pre-value.

[0012] In some embodiments, for overheat protection of the compressor based on the current indoor relative humidity and the target humidity protection threshold, the controller is specifically configured to: if it is determined that the current indoor relative humidity is greater than the target humidity protection threshold, then perform overheat protection on the compressor until the current indoor relative humidity is less than or equal to the target humidity protection threshold; if it is determined that the current indoor relative humidity is less than or equal to the target humidity protection threshold, then control the dehumidifier to maintain its original state.

[0013] In some embodiments, the dehumidifier further includes a fan, and for overheat protection of the compressor, the controller is specifically configured to: control the fan speed of the dehumidifier to gradually increase in order to provide overheat protection for the compressor.

[0014] In some embodiments, the fan speed is controlled to the maximum speed to provide overheat protection for the compressor.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a dehumidifier according to an embodiment of the present invention; Figure 2 This is a flowchart of controller configuration according to an embodiment of the present invention; Figure 3 This is a flowchart of controller configuration according to another embodiment of the present invention; Figure 4 This is a flowchart of controller configuration according to another embodiment of the present invention; Figure 5 This is a flowchart of controller configuration according to another embodiment of the present invention; Figure 6 This is a flowchart of controller configuration according to another embodiment of the present invention; Figure 7 This is a flowchart of controller configuration according to another embodiment of the present invention; Figure 8 This is a flowchart of controller configuration according to another embodiment of the present invention.

[0017] Figure label: Dehumidifier 100; 1. Compressor; 2. Condenser; 3. Throttling device; 4. Evaporator; 5. Fan. Detailed Implementation

[0018] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0019] Due to significant changes in dehumidifier standards, the maximum load operating test condition has been changed from 32℃ / 60%RH to 35℃ / 80%RH. This will cause dehumidifier refrigeration systems designed according to the original standard to shut down or exceed the exhaust temperature under the 35℃ / 80%RH condition. In existing technology, an exhaust temperature sensor is added to the dehumidifier to protect it, but this increases the operating cost of the dehumidifier.

[0020] To address the aforementioned issues, the first aspect of this invention proposes a dehumidifier that requires no additional cost, can provide overheat protection for the compressor based on existing configurations, ensuring normal operation of the dehumidifier and guaranteeing the user experience.

[0021] The first aspect of the present invention provides a dehumidifier, which includes a refrigerant circuit, a temperature sensor, a humidity sensor, and a controller.

[0022] In the refrigerant circuit, the refrigerant circulates sequentially between the compressor, condenser, throttling device, and evaporator; a temperature sensor, located on the evaporator, is used to obtain the current indoor ambient temperature; a humidity sensor, located on the evaporator, is used to obtain the current indoor relative humidity; and the controller is connected to the temperature and humidity sensors.

[0023] refer to Figure 1 The diagram illustrates the refrigeration circuit of a dehumidifier 100. During operation, the refrigerant is compressed by the compressor 1, becoming a high-temperature, high-pressure gas. It then enters the condenser 2, where it releases heat and transforms from gas to liquid. The refrigerant then enters the throttling device 3, becoming a low-temperature, low-pressure liquid. This low-temperature, low-pressure liquid refrigerant enters the evaporator 4, absorbs heat, and transforms into a gas. The gaseous refrigerant flows out of the evaporator and back into the compressor 1, completing the refrigeration cycle. Air, after being filtered, first flows through the evaporator 4. Due to the low temperature of the refrigerant in the indoor heat exchanger, moisture in the air condenses into liquid droplets and flows out along the evaporator 4, drying the air. The dried airflow is then heated by the condenser 2 and finally discharged by the fan 5. The throttling device 3 can be a capillary tube or an electronic expansion valve.

[0024] Based on the above dehumidifier architecture, refer to Figure 2 As shown, the controller is configured to perform the following steps S1-S2, the specific steps of which are as follows.

[0025] Step S1: Obtain the current indoor relative humidity and current indoor ambient temperature.

[0026] Specifically, during the operation of a dehumidifier, when the relative humidity in the room is high, the air contains more moisture, and the dehumidifier needs to remove more moisture to achieve the same dehumidification effect. The higher indoor ambient temperature will increase the evaporation temperature of the refrigerant in the evaporator, which will lead to an increase in both the condensation pressure and evaporation pressure in the refrigerant circuit, and increase the compression ratio of the compressor, thus significantly increasing the load on the dehumidifier.

[0027] Therefore, when the environmental conditions of the dehumidifier change, the load of the dehumidifier will also change accordingly, thus affecting the internal heat generation of compressor 1. When the internal heat generation of the compressor increases, if no corresponding measures are taken, the exhaust temperature of compressor 1 will increase. If the exhaust temperature of compressor 1 remains too high, it will cause compressor 1 to overheat and be damaged or its performance to decline. To avoid overheating, compressor 1 will shut down. However, during the process of compressor 1 shutting down due to overheating, the dehumidifier cannot operate, resulting in a poor user experience. This application monitors the environmental conditions of the dehumidifier by setting temperature and humidity sensors on the evaporator. After obtaining the current indoor ambient temperature and relative humidity, the sensors are sent to the controller. The current indoor relative humidity and current indoor ambient temperature can be used to assess the current load of the dehumidifier to determine whether there is a risk of compressor 1 shutting down due to overheating. When the dehumidifier load is too high, corresponding measures are taken to avoid compressor 1 shutting down due to overheating, which would prevent the dehumidifier from operating normally.

[0028] Step S2: Perform overheat protection on the compressor based on the current indoor relative humidity and current indoor ambient temperature.

[0029] Specifically, in existing technologies, a new exhaust temperature sensor is added to the dehumidifier to monitor the compressor's exhaust temperature and protect the compressor. However, adding an exhaust temperature sensor not only increases the operating cost of the dehumidifier but also increases its complexity. In order to control the operating cost of the dehumidifier, this application monitors the current indoor environment based on the existing temperature and humidity sensors without changing the internal components of the dehumidifier. It determines whether the dehumidifier load is within the normal range based on the current indoor relative humidity and current indoor ambient temperature, i.e., whether there is a risk of the compressor overheating and shutting down. When the dehumidifier load is too high, the compressor is protected against overheating. Thus, the dehumidifier can achieve compressor overheat protection without adding additional hardware, ensuring the normal operation of the dehumidifier and protecting the user experience.

[0030] According to the embodiments of the present invention, the dehumidifier does not require additional hardware configuration. It uses temperature and humidity sensors to monitor the working environment of the dehumidifier to determine whether the dehumidifier will shut down due to compressor overheating. When there is a risk of the dehumidifier shutting down, it provides overheat protection for the compressor. Thus, without increasing the cost of using the dehumidifier, it provides overheat protection for the compressor based on the existing configuration, ensuring the normal operation of the dehumidifier and protecting the user experience.

[0031] In some embodiments, for overheat protection of the compressor based on the current indoor relative humidity and the current indoor ambient temperature, refer to Figure 3 As shown, the controller is specifically configured in step S3, and the specific steps are as follows.

[0032] Step S3: Periodically perform overheat protection on the compressor based on the current indoor relative humidity and current indoor ambient temperature.

[0033] Specifically, the controller acquires the dehumidifier's operating environment information, namely the current indoor temperature and relative humidity, from the temperature and humidity sensors at fixed intervals. This allows the controller to periodically perform overheat protection on compressor 1, promptly capturing trends in changes to the dehumidifier's environmental conditions. When it is determined that compressor 1 is at risk of overheating and shutting down, overheat protection is implemented.

[0034] On the other hand, since prolonged overheat protection of compressor 1 increases the energy consumption of dehumidifier 100, resulting in increased user operating costs, this application periodically applies overheat protection to the compressor to control user operating costs. This ensures continuous operation of compressor 1 while controlling the energy consumption of dehumidifier 100 and reducing energy waste. The period can be set according to actual conditions and is not specifically limited here.

[0035] In some embodiments, for periodically providing overheat protection to the compressor based on the current indoor relative humidity and the current indoor ambient temperature, refer to Figure 4 As shown, the controller is specifically configured to perform the following steps S4-S7 in each cycle, as detailed below.

[0036] Step S4: Obtain the correspondence between changes in indoor ambient temperature, indoor relative humidity and exhaust temperature. The correspondence is obtained based on tests of the dehumidifier under different temperature and humidity conditions.

[0037] Specifically, when the exhaust temperature of compressor 1 is too high, compressor 1 will overheat and be damaged. To protect the compressor, compressor 1 will shut down for protection. However, when the external environmental conditions of the dehumidifier change, the heat output of compressor 1 will vary. When the temperature and humidity conditions are low temperature and low humidity, the operating power of compressor 1 is relatively small, the internal heat output of compressor 1 is small and relatively stable, and its exhaust temperature is low. When the temperature and humidity conditions are high temperature and high humidity, the operating power of compressor 1 is large, the internal heat output of compressor 1 is large, and its exhaust temperature is high.

[0038] The changes in exhaust temperature under different combinations of indoor ambient temperature and relative humidity were measured experimentally. The indoor ambient temperature, relative humidity, and exhaust temperature were recorded separately, and the corresponding relationships were pre-stored in the controller. The format of these relationships can be set according to actual conditions and is not specifically limited here. For example, as shown in Table 1, the relationship between indoor ambient temperature, relative humidity, and exhaust temperature can be obtained by looking up Table 1. Where T is the indoor ambient temperature (T1 < T2 < T3); A is the indoor relative humidity (A1 < A2 < A3 < A4 < A5 < A6 < A7 < A8); and Y is the exhaust temperature (Y1 < Y2 < Y3 < Y4 < Y5 < Y6 < Y7 < Y8).

[0039] Step S5: Determine the humidity protection threshold corresponding to different indoor ambient temperatures based on the corresponding relationship of changes.

[0040] Specifically, based on the above-mentioned correspondence of changes, this application can query the maximum value of indoor relative humidity, i.e. humidity protection threshold, when the compressor 1 will not overheat and be damaged under different indoor ambient temperatures. At this indoor ambient temperature, the compressor 1 can operate normally without overheating when it operates at its corresponding humidity protection threshold.

[0041] Step S6: Determine the target humidity protection threshold based on the change correspondence, humidity protection threshold, and current indoor ambient temperature.

[0042] Specifically, the controller can match the humidity protection threshold corresponding to the current indoor ambient temperature, i.e. the target humidity protection threshold, based on the current indoor ambient temperature and the corresponding relationship of changes. Thus, this application can dynamically adjust the target humidity protection threshold according to the changes in indoor ambient temperature, providing more precise protection for compressor 1 and ensuring that compressor 1 can operate normally without overheating under different current indoor ambient temperatures.

[0043] Step S7: Perform overheat protection on the compressor based on the current indoor relative humidity and the target humidity protection threshold.

[0044] Specifically, by comparing the current indoor relative humidity with the target humidity protection threshold, the controller can determine whether the exhaust temperature of compressor 1 exceeds its exhaust temperature protection threshold, thereby judging whether there is a risk of compressor overheating and shutdown. When it is determined that compressor 1 may overheat and shut down, overheat protection is implemented for compressor 1 to avoid compressor 1 needing to shut down due to excessively high exhaust temperature. This ensures normal operation of the dehumidifier without increasing the cost of the dehumidifier, thus protecting the user's experience.

[0045] Table 1

[0046] In some embodiments, the humidity protection threshold is the target indoor relative humidity; wherein, the target indoor relative humidity is the indoor relative humidity corresponding to the exhaust temperature critical value under the indoor ambient temperature in the change correspondence relationship, and the exhaust temperature critical value is the exhaust temperature that does not trigger the compressor to perform overheat protection.

[0047] Specifically, when the exhaust temperature of compressor 1 exceeds its exhaust temperature threshold, compressor 1 will shut down to prevent overheating and damage. This application can query the indoor relative humidity corresponding to each exhaust temperature under different indoor ambient temperatures through a change correspondence. Thus, for different indoor ambient temperatures, the target indoor relative humidity when the exhaust temperature is at the exhaust temperature threshold, i.e., the relative humidity protection threshold, can be obtained. The exhaust temperature threshold can be set according to actual conditions, and no specific restrictions are imposed here.

[0048] In some embodiments, the humidity protection threshold is the difference between the target indoor relative humidity and the preset allowable error; wherein, the target indoor relative humidity is the indoor relative humidity corresponding to the exhaust temperature critical value under the indoor ambient temperature in the change correspondence relationship, and the exhaust temperature critical value is the exhaust temperature that does not trigger the compressor to perform overheat protection.

[0049] Specifically, the humidity protection threshold can be determined by calculating the difference between the target indoor relative humidity and the preset allowable error. To avoid misjudging the current indoor relative humidity due to equipment errors, which could damage compressor 1, this application uses the preset allowable error as a safety margin. This further reduces the humidity protection threshold based on the target indoor relative humidity, providing an additional safety margin. This allows compressor 1 to initiate overheat protection earlier, effectively protecting it and ensuring it is not damaged or its performance degraded due to overheating. The preset allowable error can be set according to actual conditions. By changing the magnitude of the preset allowable error, the sensitivity of compressor 1's overheat protection can be controlled to adapt to different application scenarios.

[0050] In some embodiments, multiple indoor ambient temperatures are generated with a preset step size when the change correspondence is obtained from the test. A target humidity protection threshold is determined based on the change correspondence, the humidity protection threshold, and the current indoor ambient temperature, referencing... Figure 5 As shown, the controller is specifically configured in steps S8-S9.

[0051] Step S8: Determine the current indoor ambient temperature as greater than the first indoor ambient temperature and less than or equal to the second indoor ambient temperature based on the multiple indoor ambient temperature correspondences in the change correspondence.

[0052] Specifically, taking a preset value of 'a' as an example, this application adopts a segmented control concept, dividing the indoor ambient temperature into steps with preset values, as shown in Table 1. T1, T2, and T3 represent different indoor ambient temperatures, and the temperature difference between each indoor ambient temperature point is fixed, i.e., T1 + a = T2, T2 + a = T3. The temperature is matched according to the magnitude of the current indoor ambient temperature to determine the temperature range in which the current indoor ambient temperature falls, i.e., greater than the first indoor ambient temperature and less than or equal to the second indoor ambient temperature. For example, when the current indoor ambient temperature is greater than T1 and less than or equal to T2, T2 is the second indoor ambient temperature; or, when the current indoor ambient temperature is greater than T2 and less than or equal to T3, T3 is the second indoor ambient temperature.

[0053] Step S9: Determine the target humidity protection threshold based on the humidity protection threshold corresponding to the second indoor ambient temperature.

[0054] Specifically, within each temperature range, the humidity protection threshold corresponding to the highest indoor ambient temperature, i.e., the second indoor ambient temperature, is selected as the target humidity protection threshold.

[0055] For example, the exhaust temperature threshold is P℃, the preset allowable error is X, and when the second indoor ambient temperature is T1, if P is greater than Y3 and less than Y4, as shown in Table 1, the target humidity protection threshold is determined to be (A3+X)%. When the second indoor ambient temperature is T2, as shown in Table 1, if P is greater than Y7 and less than Y8, the target humidity protection threshold is determined to be (A7+X)%.

[0056] In some embodiments, the target humidity protection threshold is the humidity protection threshold corresponding to the second indoor ambient temperature, or the target humidity protection value is the sum of the humidity protection threshold corresponding to the second indoor ambient temperature and a preset pre-value.

[0057] Specifically, directly using the humidity protection threshold corresponding to the second indoor ambient temperature as the target humidity protection threshold may cause frequent start-stop of the compressor 1's overheat protection near the target humidity protection threshold, affecting the normal operation of the compressor 1 and the user experience. Therefore, this application introduces a preset pre-value as a hysteresis interval, setting an upper and lower limit for the target humidity protection threshold, which serves as the start and stop thresholds for the compressor 1's overheat protection. When the current indoor relative humidity exceeds the start threshold, the upper limit of the target humidity protection threshold is triggered, and the compressor 1 is protected against overheating. When the current indoor relative humidity is below the stop threshold, the lower limit of the target humidity protection threshold is triggered, and the compressor 1's overheat protection is released. When the current indoor relative humidity is between the start and stop thresholds, the overheat protection status remains unchanged. This reduces the frequent start-stop of the overheat protection, avoids frequent start-stop of the compressor 1's overheat protection due to fluctuations in the current indoor relative humidity, extends the service life of the compressor 1, and improves the user experience. The preset threshold can be set according to the actual situation. For example, the preset threshold can be set to -3%, -2%, 0%, 2%, or 3%, etc. So, when determining the upper and lower limits of the target humidity protection threshold, different preset thresholds can be used. No specific restrictions are imposed here.

[0058] For example, if the preset threshold is 3% or 0, the exhaust temperature threshold is P℃, and the second indoor ambient temperature is T1, and P is greater than Y3 and less than Y4, then the upper limit of the target humidity protection threshold is determined to be (A3+X+3)%, and the lower limit is (A3+X)%. Alternatively, if the preset threshold is 3% or -3%, the exhaust temperature threshold is P℃, and the second indoor ambient temperature is T1, and P is greater than Y3 and less than Y4, then the upper limit of the target humidity protection threshold is determined to be (A3+X+3)%, and the lower limit is (A3+X-3)%. By setting different preset thresholds, the upper and lower limits of the target humidity protection threshold can be adjusted to avoid the compressor 1 from frequently starting and stopping near the target humidity protection threshold to prevent overheating protection.

[0059] In some embodiments, for overheat protection of the compressor based on the current indoor relative humidity and a target humidity protection threshold, refer to Figure 6 As shown, the controller is specifically configured to execute steps S10-S11, and the specific steps are as follows.

[0060] Step S10: If it is determined that the current indoor relative humidity is greater than the target humidity protection threshold, then the compressor is protected against overheating until the current indoor relative humidity is less than or equal to the target humidity protection threshold.

[0061] Step S11: If it is determined that the current indoor relative humidity is less than or equal to the target humidity protection threshold, then control the dehumidifier to maintain its original state.

[0062] Specifically, when the current indoor relative humidity exceeds the start-up threshold, compressor 1 is activated for overheat protection until the current indoor relative humidity falls below the release threshold. Furthermore, when the current indoor relative humidity is between the start-up threshold and the release threshold, the overheat protection status remains unchanged, and the dehumidifier is kept in its original state. This reduces the frequency of overheat protection activation and deactivation, preventing fluctuations in the current indoor relative humidity from causing frequent activation and deactivation of compressor 1's overheat protection, thus extending the lifespan of compressor 1 and improving the user experience.

[0063] In some embodiments, the dehumidifier also includes a fan, and for overheat protection of the compressor, see reference [reference]. Figure 7 As shown, the controller is specifically configured to execute step S12, the specific steps of which are as follows.

[0064] Step S12: Gradually increase the fan speed of the dehumidifier to protect the compressor from overheating.

[0065] Specifically, if the current indoor relative humidity is determined to be greater than the target humidity protection threshold, the controller can increase the speed of fan 5 to enhance its heat dissipation capacity and prevent compressor 1 from overheating. The fan speed can be set according to actual conditions. For example, when the current indoor relative humidity is determined to be greater than the target humidity protection threshold, the fan operates at a preset speed, which is greater than the current speed; or, when the current indoor relative humidity is determined to be greater than the target humidity protection threshold, the fan speed is determined based on the current exhaust temperature; the greater the current exhaust temperature exceeds the exhaust temperature protection threshold, the faster the fan speed.

[0066] In some embodiments, the fan speed is controlled at the maximum speed to provide overheat protection for the compressor.

[0067] Specifically, if the current indoor relative humidity is determined to be greater than the target humidity protection threshold, the controller directly controls the fan to run at maximum speed to protect compressor 1 from overheating, and to dissipate heat from compressor 1 with maximum heat dissipation capacity to avoid compressor 1 overheating.

[0068] The following is for reference. Figure 8 The controller configuration of an embodiment of the present invention is described below, and the specific steps are as follows.

[0069] Step S13, Begin.

[0070] Step S14: Is the dehumidifier in a high-temperature zone? If yes, proceed to step S15; otherwise, proceed to step S16.

[0071] Step S15: Maintain the current operating state.

[0072] Step S16: The current ambient temperature is greater than the first indoor ambient temperature and less than or equal to the second indoor ambient temperature.

[0073] Step S17: Determine the target humidity protection threshold.

[0074] Step S18: Determine that the current indoor relative humidity is greater than the target humidity protection threshold.

[0075] Step S19: Activate the compressor overheat protection and switch to high fan mode.

[0076] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0077] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A dehumidifier, characterized in that, include: A refrigerant circuit in which the refrigerant circulates sequentially between the compressor, condenser, throttling device and evaporator; A temperature sensor, located in the evaporator, is used to obtain the current indoor ambient temperature; A humidity sensor, located in the evaporator, is used to obtain the current indoor relative humidity; The controller, connected to the temperature sensor and the humidity sensor, is configured to: Obtain the current indoor relative humidity and the current indoor ambient temperature; The compressor is protected against overheating based on the current indoor relative humidity and the current indoor ambient temperature.

2. The dehumidifier according to claim 1, characterized in that, The controller is specifically configured to provide overheat protection for the compressor based on the current indoor relative humidity and the current indoor ambient temperature. The compressor is periodically protected against overheating based on the current indoor relative humidity and the current indoor ambient temperature.

3. The dehumidifier according to claim 2, characterized in that, To periodically perform overheat protection on the compressor based on the current indoor relative humidity and the current indoor ambient temperature, the controller is specifically configured to perform the following steps in each cycle: The relationship between changes in indoor ambient temperature, indoor relative humidity, and exhaust temperature is obtained, wherein the relationship is obtained based on tests of the dehumidifier under different temperature and humidity conditions; Based on the aforementioned relationship of change, determine the humidity protection threshold corresponding to different indoor ambient temperatures; The target humidity protection threshold is determined based on the change correspondence, the humidity protection threshold, and the current indoor ambient temperature. The compressor is protected against overheating based on the current indoor relative humidity and the target humidity protection threshold.

4. The dehumidifier according to claim 3, characterized in that, The humidity protection threshold is the target indoor relative humidity; Wherein, the target indoor relative humidity is the indoor relative humidity corresponding to the exhaust temperature critical value under the indoor ambient temperature in the change correspondence relationship, and the exhaust temperature critical value is the exhaust temperature that does not trigger the compressor to perform overheat protection.

5. The dehumidifier according to claim 3, characterized in that, The humidity protection threshold is the difference between the target indoor relative humidity and the preset allowable error; Wherein, the target indoor relative humidity is the indoor relative humidity corresponding to the exhaust temperature critical value under the indoor ambient temperature in the change correspondence relationship, and the exhaust temperature critical value is the exhaust temperature that does not trigger the compressor to perform overheat protection.

6. The dehumidifier according to claim 3, characterized in that, When the change correspondence is obtained through testing, multiple indoor ambient temperatures are generated with a preset step size. To determine the target humidity protection threshold based on the change correspondence, the humidity protection threshold, and the current indoor ambient temperature, the controller is specifically configured as follows: Based on the multiple indoor ambient temperatures in the change correspondence, the current indoor ambient temperature is determined to be greater than the first indoor ambient temperature and less than or equal to the second indoor ambient temperature; The target humidity protection threshold is determined based on the humidity protection threshold corresponding to the second indoor ambient temperature.

7. The dehumidifier according to claim 6, characterized in that, The target humidity protection threshold is the humidity protection threshold corresponding to the second indoor ambient temperature, or the target humidity protection value is the sum of the humidity protection threshold corresponding to the second indoor ambient temperature and a preset pre-value.

8. The dehumidifier according to claim 3, characterized in that, The controller is specifically configured to provide overheat protection for the compressor based on the current indoor relative humidity and the target humidity protection threshold: If it is determined that the current indoor relative humidity is greater than the target humidity protection threshold, then the compressor is protected against overheating until the current indoor relative humidity is less than or equal to the target humidity protection threshold. If the current indoor relative humidity is determined to be less than or equal to the target humidity protection threshold, the dehumidifier is controlled to maintain its original state.

9. The dehumidifier according to any one of claims 1-8, characterized in that, The dehumidifier also includes a fan, and the controller is specifically configured to provide overheat protection for the compressor as follows: The fan speed of the dehumidifier is gradually increased to protect the compressor from overheating.

10. The dehumidifier according to claim 8, characterized in that, The fan speed is controlled at its maximum speed to provide overheat protection for the compressor.

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