Method for optimizing the contact surface friction of a bottom frame and a middle frame

Abstract

The application discloses a control method for optimizing friction of a bottom frame and a middle frame contact surface, and relates to the technical field of air conditioners. The method comprises the following steps: an air conditioner is in a silent state; the air conditioner is kept in a preset temperature environment for a preset time; a laser displacement sensor is assembled at a buckle of a contact part at the rear side of the bottom frame and the middle frame to perform displacement prediction calculation; a heating mode is started; the laser displacement sensor detects and accumulates displacement in real time; a fast change stage and a stable stage are divided according to heat source changes; whether the highest temperature is reached in the fast change stage is judged; when the highest temperature is reached, the displacement change is judged in magnitude; and control strategies of changing the angle of an electric heating fin, changing the position of the electric heating fin and changing the gap of a matching part are adopted according to the displacement magnitude. The application can detect the thermal expansion and cold shrinkage displacement of the contact surface of the bottom frame and the middle frame in real time and perform graded feedback control, effectively reduces the friction and displacement of the contact surface and improves the operation reliability of the air conditioner.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a control method for optimizing the friction of the contact surfaces of the bottom frame and the middle frame. Background Technology

[0002] During long-term operation, wall-mounted air conditioners experience significant thermal expansion and contraction in their pipes and components due to refrigerant circulation and temperature changes. This is particularly true in large-scale air conditioning water systems, where pipes are spaced far apart both vertically and horizontally, and the water temperature fluctuates dramatically between summer and winter, causing noticeable thermal expansion and contraction in the user-side pipes. Without effective measures, this can lead to problems such as deformation of fixed supports, pipe displacement, and even rupture, severely impacting system stability and lifespan. Furthermore, thermal expansion and contraction can reduce the regulating performance of critical components like expansion valves, increasing the risk of system pressure fluctuations and decreasing cooling and heating efficiency. Therefore, addressing the thermal expansion and contraction issue in air conditioners—through optimized pipe compensation design, strengthened support and hanger installations, and dynamic adjustment of expansion valve control strategies—is crucial for improving the reliability of air conditioning systems, extending equipment lifespan, and ensuring user comfort. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a control method for optimizing the friction of the contact surfaces of the bottom frame and the middle frame. This invention can detect the displacement changes of the contact surfaces in real time and perform hierarchical feedback control to achieve active optimization of thermal expansion and contraction.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a method for controlling friction optimization of the contact surface between the bottom frame and the middle frame, comprising the following steps:

[0005] Step 1: The air conditioner is in silent mode;

[0006] Step 2: Place the entire air conditioner in a preset temperature environment for a preset time to simulate its state before actual operation;

[0007] Step 3: Install a laser displacement sensor at the buckle of the contact part between the bottom frame and the middle frame. Perform displacement prediction calculation through the laser displacement sensor to obtain initial displacement data in order to determine the initial relative position between the bottom frame and the middle frame.

[0008] Step 4: Turn on the air conditioner in heating mode;

[0009] Step 5: During the heat source rising phase, activate the laser displacement sensor to perform real-time displacement detection. As the heat source rises, record and accumulate the displacement amount.

[0010] Step 6: Based on the characteristics of heat source changes, divide the heating process into a rapid change stage and a stable heat source stage;

[0011] Step 7: Determine whether the air conditioner has reached its maximum temperature during the rapid change phase;

[0012] Step 8: When the air conditioner temperature rises to the highest temperature during the rapid change phase, the laser displacement sensor accumulates and calculates the displacement change from the initial displacement.

[0013] Step 9: If the air conditioner temperature does not reach the maximum temperature during the rapid change phase, the air conditioner continues to heat up until the maximum temperature is reached.

[0014] Step 10: When the temperature reaches the highest level, the magnitude of the displacement change at the contact position is determined by the laser displacement sensor.

[0015] Step 11: Divide the displacement into three magnitudes based on the instantaneous acceleration of the displacement, corresponding to three displacement ranges respectively, and reduce and compensate the heat source according to the three magnitudes to adjust the fit clearance.

[0016] Step 12: When the laser displacement sensor reports the displacement of the contact surface within the first displacement range, it is determined to be a slight slip. The heat is compensated and weakened by changing the angle of the electric heating fins to reduce the displacement at the mating point.

[0017] Step 13: When the laser displacement sensor reports the displacement of the contact surface within the second displacement range, it is determined to be a mid-section slip. The heat is compensated and reduced by changing the electric heating position to reduce the displacement at the mating point.

[0018] Step 14: When the laser displacement sensor reports that the displacement of the contact surface is within the third displacement range, it is determined to be a large slippage, and the displacement is reduced by changing the gap at the mating point.

[0019] Step 15: Complete the feedback optimization of thermal expansion and contraction in heating mode.

[0020] As a further improvement of the present invention, in step 2, the preset temperature is 10°C and the preset time is 30 min.

[0021] As a further improvement of the present invention, in step 6, the rapid change phase is the interval of 0 to 7.5 minutes, which is the phase of rapid temperature rise.

[0022] As a further improvement of the present invention, in step 11, the three displacement ranges are 0 to 0.3, 0.3 to 0.5, and 0.5 to 1, respectively, and the three orders of magnitude are 0.3, 0.5, and 1, respectively.

[0023] As a further improvement of the present invention, in step 14, the method of changing the gap at the mating point includes: adding a fixing buckle or adding a blocking rib at the position with large displacement to suppress deformation; and / or, adding a point-line mating or a point-surface mating along the opposite displacement position.

[0024] The beneficial effects of this invention are:

[0025] 1. This invention uses a laser displacement sensor to detect the displacement changes of the contact surface between the bottom frame and the middle frame in real time, which can accurately obtain the relative displacement data caused by thermal expansion and contraction, providing an accurate basis for subsequent feedback control.

[0026] 2. This invention divides the displacement into three levels based on the instantaneous acceleration of the displacement, and adopts differentiated control strategies for different levels (changing the angle of the electric heating fins, changing the electric heating position, and changing the gap at the mating point), thereby achieving graded and precise feedback control and effectively reducing friction and displacement at the contact surface.

[0027] 3. By adding fixing clips or blocking ribs at locations with large displacements, and by adding point-line or point-surface coordination along opposite displacement positions, this invention can effectively suppress displacement at the structural level when the displacement magnitude is large, thus ensuring the stability and reliability of the air conditioner's long-term operation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall logic of the control method for optimizing the friction of the contact surfaces of the bottom frame and the middle frame in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the instantaneous acceleration measurement level division in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of feedback and optimization when the magnitude is 1mm in an embodiment of the present invention. Detailed Implementation

[0031] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] Example

[0033] like Figure 1 As shown, this embodiment provides a method for optimizing friction at the contact surfaces of the bottom frame and the middle frame, including the following steps:

[0034] Step 1: Air conditioner in silent mode.

[0035] Before starting the air conditioner, it should first be brought to a standby state, meaning the entire unit is not running and all components are stationary. This step is to provide a reference state for subsequent initial displacement detection.

[0036] Step 2: Let the air conditioner stand still in an environment with a temperature of 10℃ for 30 minutes.

[0037] The entire air conditioner unit was placed in a constant temperature environment of 10°C and left to stand for 30 minutes to simulate the state of the unit before startup in winter. After sufficient resting, the temperature of each component of the air conditioner reached equilibrium with the ambient temperature, thus closely approximating the state before actual operation. This step ensures the consistency and repeatability of the initial state for subsequent displacement detection. Of course, in other embodiments, other temperatures and resting times can be selected according to actual needs.

[0038] Step 3: Install laser displacement sensors at the snap-fit ​​points on the rear contact parts of the bottom frame and the middle frame to perform displacement prediction calculations.

[0039] A laser displacement sensor is installed at the snap-fit ​​joint on the rear contact area between the bottom frame and the middle frame. The laser displacement sensor works by using laser triangulation or laser interferometry to accurately measure the displacement of a target object by emitting a laser beam and receiving the reflected light. Before the air conditioner is started, the laser displacement sensor first performs displacement prediction calculations to obtain initial detection data, determining the initial relative position between the bottom frame and the middle frame. This initial displacement data serves as the reference value (zero point) for subsequent displacement changes.

[0040] Step 4: Turn on the air conditioner to heating mode.

[0041] Turn on the air conditioner and set it to heating mode. In heating mode, a heat source is generated inside the air conditioner, causing the temperature of various components to rise.

[0042] Step 5: During the heat source rising phase, the laser displacement sensor begins to operate.

[0043] During the heat source rising phase (i.e., the phase where the temperature gradually increases after the air conditioner is turned on), the laser displacement sensor is activated for real-time displacement detection. As the heat source rises, the relative displacement between the bottom frame and the middle frame begins to change, and the laser displacement sensor records and accumulates the displacement in real time. The displacement is accumulated by starting from the initial displacement reference value obtained in step 3 and recording the difference between the current displacement value and the reference value in real time.

[0044] Step 6: The changes in the heat source are divided into a rapid change phase and a stable heat source phase.

[0045] Based on the changing characteristics of the heat source, the heating process is divided into two stages: a rapid change stage and a stable heat source stage. According to experimental test results, the temperature rises rapidly within the range of 0–7.5 min. During the rapid change stage, the temperature rises at a relatively fast rate, and the thermal expansion and contraction effect is significant; during the stable heat source stage, the temperature tends to stabilize, and the displacement change tends to be gradual.

[0046] Step 7: Determine whether the air conditioner rapidly rises to the highest temperature within the 0-7.5 minute interval.

[0047] This function determines whether the air conditioner has reached its maximum temperature during the rapid temperature change phase (0–7.5 min). This determination is used to differentiate between different heating modes in order to implement appropriate displacement detection strategies.

[0048] Step 8: When the air conditioner temperature reaches its highest point within the 0-7.5 min interval, the laser displacement sensor starts accumulating and calculating the displacement change from the initial 0 displacement.

[0049] Once the air conditioner temperature reaches its maximum during the rapid change phase, the laser displacement sensor starts calculating the displacement change from the initial displacement reference value (zero position) obtained in step 3. That is, the current detected displacement value is subtracted from the initial reference value to obtain the actual displacement change caused by thermal expansion and contraction.

[0050] Step 9: If the air conditioner temperature does not reach the maximum temperature within the 0-7.5 minute interval, the air conditioner will continue to heat up.

[0051] If the air conditioner fails to reach its maximum temperature during the rapid temperature change phase, it indicates a slow heating rate, and the air conditioner continues to heat up. After x minutes (where x is the actual time required to reach the maximum temperature), the subsequent time is divided into intervals of 0 to x minutes for the current air conditioner. In other words, the duration of the rapid temperature change phase is dynamically adjusted based on the actual time required to reach the maximum temperature.

[0052] Step 10: When the temperature reaches its maximum, the laser displacement sensor at the assembly point determines the magnitude of the displacement change at the contact position.

[0053] When the air conditioner reaches its maximum temperature, a laser displacement sensor mounted on the latch determines the magnitude of the displacement change at the contact point. This magnitude determination categorizes the displacement into different levels based on its magnitude, allowing for differentiated control strategies.

[0054] Step 11: The displacement is divided into three orders of magnitude according to the magnitude of the instantaneous acceleration.

[0055] Based on the magnitude of the instantaneous acceleration of the displacement, the displacement is divided into three orders of magnitude. For example... Figure 2 and Figure 3 As shown, specifically, the three displacement ranges are 0–0.3, 0.3–0.5, and 0.5–1 (unit: mm), corresponding to three orders of magnitude of 0.3, 0.5, and 1. Based on the values ​​and constraints of the displacement ranges, the three displacement ranges are ultimately quantified into three orders of magnitude values. Heat source reduction and compensation are performed based on these three orders of magnitude, thereby achieving adjustment of the fit clearance.

[0056] It should be noted that the above displacement range and magnitude values ​​are preferred values ​​obtained based on experimental tests. In other embodiments, they can be appropriately adjusted according to the specific structural dimensions and material properties of the air conditioner.

[0057] Step 12: When the displacement of the contact surface reported by the laser displacement sensor is in the range of 0 to 0.3, the order of magnitude is 0.3.

[0058] When the displacement of the contact surface reported by the laser displacement sensor is within the range of 0 to 0.3 mm, the magnitude is 0.3. The system defaults to this as a minor slippage, and compensates for and reduces the heat by changing the angle of the electric heating fins, thereby reducing the displacement at the mating point. Changing the angle of the electric heating fins affects the direction and intensity of heat radiation, which in turn affects the temperature distribution of the bottom and middle frames, thus adjusting the amount of displacement caused by thermal expansion and contraction.

[0059] Step 13: When the displacement of the contact surface reported by the laser displacement sensor is in the range of 0.3 to 0.5, the order of magnitude is 0.5.

[0060] When the displacement of the contact surface reported by the laser displacement sensor is within the range of 0.3–0.5 mm, the magnitude is 0.5. The system defaults to this as mid-section slippage. By changing the position of the electric heating, heat is compensated for and reduced, thereby reducing the displacement at the mating point. Changing the position of the electric heating affects the concentration area and distribution range of heat, thus more effectively regulating the temperature change and displacement in specific areas.

[0061] Step 14: When the displacement of the contact surface reported by the laser displacement sensor is in the range of 0.5 to 1, the order of magnitude is 1.

[0062] When the displacement of the contact surface reported by the laser displacement sensor is within the range of 0.5–1 mm, the magnitude is 1. The system defaults to this as a large slippage, and the displacement is reduced by changing the clearance at the mating joint. Specifically, the methods for changing the clearance at the mating joint include, but are not limited to, the following two:

[0063] ① Add fixing clips or blocking ribs at locations with large displacement to suppress deformation. Fixing clips and blocking ribs can structurally limit the relative movement between the bottom frame and the middle frame, thereby effectively suppressing large displacement.

[0064] ② Add point-line or point-surface fits along the opposing displacement positions. A point-line fit refers to a fit where one component has a dot-like protrusion and another component has a line-like groove; a point-surface fit refers to a fit where one component has a dot-like protrusion and another component has a planar area. These fits can provide a limiting function while allowing a certain degree of relative movement.

[0065] Step 15: Complete the feedback optimization of thermal expansion and contraction in heating mode.

[0066] Through the detection, judgment, and feedback control steps described above, the displacement of the contact surface between the bottom frame and the middle frame caused by thermal expansion and contraction in heating mode is optimized. This method can be automatically executed every time the air conditioner starts heating, achieving continuous dynamic optimization of thermal expansion and contraction.

[0067] The control method for optimizing the friction of the contact surfaces of the bottom and middle frames provided in this embodiment can be widely applied to various wall-mounted air conditioning products, especially suitable for air conditioners used in environments with large temperature variations. This method does not require significant modifications to the existing air conditioner's hardware structure; it only requires adding laser displacement sensors to the latches between the bottom and middle frames and combining them with appropriate control logic. It has good industrial applicability and promotional value.

[0068] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for optimizing friction at the contact surfaces of a bottom frame and a middle frame, characterized in that, Includes the following steps: Step 1: The air conditioner is in silent mode; Step 2: Place the entire air conditioner in a preset temperature environment for a preset time to simulate its state before actual operation; Step 3: Install a laser displacement sensor at the buckle of the contact part between the bottom frame and the middle frame. Perform displacement prediction calculation through the laser displacement sensor to obtain initial displacement data in order to determine the initial relative position between the bottom frame and the middle frame. Step 4: Turn on the air conditioner in heating mode; Step 5: During the heat source rising phase, activate the laser displacement sensor to perform real-time displacement detection. As the heat source rises, record and accumulate the displacement amount. Step 6: Based on the characteristics of heat source changes, divide the heating process into a rapid change stage and a stable heat source stage; Step 7: Determine whether the air conditioner has reached its maximum temperature during the rapid change phase; Step 8: When the air conditioner temperature rises to the highest temperature during the rapid change phase, the laser displacement sensor accumulates and calculates the displacement change from the initial displacement. Step 9: If the air conditioner temperature does not reach the maximum temperature during the rapid change phase, the air conditioner continues to heat up until the maximum temperature is reached. Step 10: When the temperature reaches the highest level, the magnitude of the displacement change at the contact position is determined by the laser displacement sensor. Step 11: Divide the displacement into three magnitudes based on the instantaneous acceleration of the displacement, corresponding to three displacement ranges respectively, and reduce and compensate the heat source according to the three magnitudes to adjust the fit clearance. Step 12: When the laser displacement sensor reports the displacement of the contact surface within the first displacement range, it is determined to be a slight slip. The heat is compensated and weakened by changing the angle of the electric heating fins to reduce the displacement at the mating point. Step 13: When the laser displacement sensor reports the displacement of the contact surface within the second displacement range, it is determined to be a mid-section slip. The heat is compensated and reduced by changing the electric heating position to reduce the displacement at the mating point. Step 14: When the laser displacement sensor reports that the displacement of the contact surface is within the third displacement range, it is determined to be a large slippage, and the displacement is reduced by changing the gap at the mating point. Step 15: Complete the feedback optimization of thermal expansion and contraction in heating mode.

2. The control method for optimizing friction at the contact surfaces of the bottom frame and the middle frame according to claim 1, characterized in that, In step 2, the preset temperature is 10℃ and the preset time is 30min.

3. The control method for optimizing friction at the contact surfaces of the bottom frame and the middle frame according to claim 1, characterized in that, In step 6, the rapid change phase is the 0-7.5 min interval, during which the temperature rises rapidly.

4. The control method for optimizing friction at the contact surfaces of the bottom frame and the middle frame according to claim 1, characterized in that, In step 11, the three displacement ranges are 0 to 0.3, 0.3 to 0.5, and 0.5 to 1, respectively, and the three orders of magnitude are 0.3, 0.5, and 1, respectively.

5. The control method for optimizing friction at the contact surfaces of the bottom frame and the middle frame according to claim 1, characterized in that, In step 14, the methods for changing the gap at the mating point include: adding a fixing buckle or adding a blocking rib at the position with large displacement to suppress deformation; and / or, adding a point-line mating or a point-surface mating along the opposite displacement positions.

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