A method to reduce piston cup wear

Abstract

This invention discloses a method for reducing piston cup wear. It operates on an air compressor pump with a motor capable of forward and reverse rotation. The pump's main control module controls the motor's direction of rotation and records this data. After the pump is powered on, the main control module controls the motor to rotate forward or backward based on the previously recorded rotation data. This invention utilizes the motor's reversing rotation to change the direction of the eccentric wheel, thus distributing the maximum frictional force generated at one point on the piston cup to two points, thereby extending the lifespan of the piston cup and consequently extending the service life of the pump body.

Description

Technical Field

[0001] This invention relates to the field of cylinder technology, and in particular to a method for reducing piston cup wear. Background Technology

[0002] In existing air compressor pumps, the motor drives an eccentric wheel via the motor shaft, which in turn drives a connecting rod piston, causing the piston to reciprocate within the cylinder. After prolonged use, the efficiency of the air compressor pump decreases, primarily due to wear on the plastic piston cup, which affects the pump's lifespan. During air compression, when the motor shaft drives the piston via the eccentric wheel, the friction between the piston cup and the cylinder wall is significant. Furthermore, the force exerted by the eccentric wheel on the piston is not perfectly parallel to the cylinder axis, but rather deviates slightly. This deviated area causes more severe wear on the piston cup compared to other parts of the cup. With prolonged operation, this deviated area leads to air leakage, affecting the pump's performance. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a method for reducing piston cup wear, which can slow down cup wear and extend piston service life.

[0004] Therefore, the technical solution of the present invention is: a method for reducing piston cup wear, which operates on an air compressor pump whose motor can rotate forward and reverse. The main control module of the compressor pump can control the direction of the motor and record the motor direction data. After the compressor pump is powered on, the main control module controls the motor to rotate forward or reverse according to the previous motor direction record.

[0005] Based on the above scheme and as the preferred scheme: the time from power-on to power-off of the compression pump is recorded as the working time Ti. When Ti ≥ preset threshold T, the working of this wheel is considered effective. The main control module records the direction of the wheel motor and controls the motor to reverse direction in the next working cycle.

[0006] Based on the above scheme and as a preferred scheme: if the working time Ti of a certain round is less than the preset threshold T, then the working time of that round is invalid, the main control module does not record the direction of the motor in that round, and the direction of the motor in the next round is opposite to the direction of the motor in the most recent valid working round.

[0007] Based on the above scheme and as a preferred option: the time from power-on to power-off of the compressor pump is recorded as one working time. The main control module records the working time for each operation and accumulates the working time of the motor's forward rotation to T. z The cumulative working time of the motor in reverse is T. f Each time the compressor pump is powered on, the main control module determines the time based on T. z and T fThe size of the motor is used to control its direction of rotation.

[0008] Based on the above scheme and as a preferred option: when the compression pump is powered on, if the cumulative time T of the motor rotating forward is... z > Cumulative duration T of motor reversal f If the main control module controls the motor to reverse, then if the cumulative time T of the motor rotating forward is... z <Cumulative duration T of motor reversal> f Then the main control module controls the motor to rotate forward; if the cumulative time of the motor rotating forward is T... z = Cumulative time T for motor reversal f Then the main control module controls the motor to rotate forward or backward.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: when the motor rotates forward, the point where the piston cup and cylinder have the greatest force is point A; when the motor rotates in reverse, the point where the piston cup and cylinder have the greatest force is point B, and the difference between point A and point B is 180 degrees.

[0010] Based on the above scheme and as a preferred option: the motor is a DC brushless motor, and the direction of the motor, either forward or reverse, is controlled by the main control module of the compression pump.

[0011] The leather cup is installed on the piston, and according to its arc shape, it is divided into inner and outer sides, with the inner side being the inside of the cup and the outer side being the outside.

[0012] When rotating forward, the maximum friction force at point A is on the inner side of the diaphragm, causing the diaphragm to deform outward. At point B, the maximum friction force is on the outer side of the diaphragm, causing the diaphragm to deform inward. Long-term forward operation will lead to asymmetrical friction deformation at point A, which will continuously deform outward, and at point B, which will continuously deform inward. Moreover, point A will generally wear out and leak air before point B, affecting the use of the pump body.

[0013] When rotating in reverse, the maximum frictional force at points A and B is reversed compared to when rotating forward. At point A, the maximum frictional force is on the outer side of the diaphragm, causing the diaphragm to deform inward. At point B, the maximum frictional force is on the inner side of the diaphragm, causing the diaphragm to deform outward. This counteracts the deformation tendencies at points A and B during forward rotation, alleviating the overall stress and friction deformation of the diaphragm, delaying wear and leakage, and extending the service life of the pump body.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. By using the reversing rotation of the motor to change the direction of the eccentric wheel, the direction of the force applied by the eccentric wheel to the connecting rod piston is changed. When the piston cup compresses air, the place where the friction between the cup and the inner wall of the cylinder is the greatest changes. This can distribute the maximum friction generated at one point in the cup, making it two points, thereby extending the life of the cup and thus extending the service life of the pump body.

[0016] 2. The compressor pump uses a DC brushless motor, and the direction of the motor can be changed through the main control module without the need for other control components, making operation simple and convenient. Attached Figure Description

[0017] The following detailed description, in conjunction with the accompanying drawings and embodiments of the present invention, will provide further information.

[0018] Figure 1 This is a flowchart of the control method in Example 1;

[0019] Figure 2 This is a flowchart of the control method in Example 2;

[0020] Figure 3 This is a structural cross-sectional view of an air compressor pump;

[0021] Figure 4 This is a cross-sectional view of the piston cup and cylinder block.

[0022] The components in the diagram are labeled as follows: motor 1, motor shaft 11, eccentric wheel 2, cylinder 3, connecting rod piston 4, and piston cup 41. Detailed Implementation

[0023] In the description of this invention, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this invention, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0025] See the attached drawings. The air compressor described in this embodiment includes a main control module, a motor 1, an eccentric wheel 2, a cylinder 3, and a connecting rod piston 4. The motor 1 is a DC brushless motor. The eccentric wheel 2 is mounted on the motor shaft 11. The eccentric wheel 2 has a first mounting hole and a second mounting hole with different shafts. The first mounting hole is fixedly connected to the motor shaft 11, and the second mounting hole is movably connected to the connecting rod piston 4. When the air compressor pump is running, the motor drives the eccentric wheel through the motor shaft, and then drives the connecting rod piston through the eccentric wheel, so that the piston reciprocates within the cylinder.

[0026] The main control module can control the motor to rotate forward or backward. When the motor rotates forward, the point where the force between the piston cup 41 and the cylinder is maximum is point A. When the motor rotates backward, the point where the force between the piston cup 41 and the cylinder is maximum is point B, and the difference between points A and B is 180 degrees. The main control module also has a storage module and a timing module. The storage module is used to store the direction of motor rotation, and the timing module is used to record the working time of each cycle.

[0027] The leather cup is installed on the piston, and according to its arc shape, it is divided into inner and outer sides, with the inner side being the inside of the cup and the outer side being the outside.

[0028] When rotating forward, the maximum frictional force at point A is on the inner side A1 of the diaphragm cup, causing the diaphragm cup to deform outward. The maximum frictional force at point B is on the outer side B2 of the diaphragm cup, causing the diaphragm cup to deform inward. Long-term forward rotation will lead to asymmetrical frictional deformation at point A, which continues to deform outward, and at point B, which continues to deform inward. Moreover, point A will generally wear out and leak air before point B, affecting the use of the pump body.

[0029] When rotating in reverse, the maximum frictional force at points A and B is reversed compared to when rotating forward. At point A, the maximum frictional force is on the outer side (A2) of the diaphragm, causing the diaphragm to deform inward. At point B, the maximum frictional force is on the inner side (B1) of the diaphragm, causing the diaphragm to deform outward. This counteracts the deformation tendencies at points A and B during forward rotation, alleviating the overall stress and friction deformation of the diaphragm, delaying wear and leakage, and extending the service life of the pump body.

[0030] Example 1

[0031] The method for reducing piston cup wear described in this embodiment includes the following steps:

[0032] 1) When the compression pump is powered on for the first time, the main control module drives the motor to rotate forward. The motor drives the eccentric wheel through the motor shaft, and then drives the connecting rod piston through the eccentric wheel, so that the piston moves back and forth in the cylinder. At this time, the point where the friction between the piston cup and the cylinder is the greatest is point A.

[0033] 2) When the compression pump is powered on for the second time, the main control module controls the motor to rotate in reverse according to the record of the previous forward rotation of the motor. The motor drives the eccentric wheel through the motor shaft, and then drives the connecting rod piston through the eccentric wheel, so that the piston moves back and forth in the cylinder. At this time, the point where the friction between the piston cup and the cylinder is the greatest is point B; the difference from point A, where the friction is the greatest in the previous rotation, is 180 degrees.

[0034] 3) Similarly, each time the compression pump is powered on, the main control module sets the rotation direction of the motor to be opposite to the previous motor rotation direction based on the previous motor rotation record. This causes the point of maximum friction between the piston cup and the cylinder to switch between points A and B, reducing wear at a single point and extending the service life of the piston cup.

[0035] Meanwhile, sometimes the compressor pump is powered on for a very short time, which is not normal operating condition, but rather due to operational errors such as accidental power-on or power-off. Therefore, a time parameter can be introduced to eliminate the impact of short-duration power-on and power-off operations. Specifically:

[0036] Each cycle of the compressor pump's operation begins with the compressor pump being powered on and ends with the power being cut off. The time from power-on to power-off is recorded as the working duration Ti. When Ti ≥ the preset threshold T, the cycle of operation is considered valid. The main control module records the direction of the motor in that cycle and controls the motor to reverse direction in the next cycle of operation.

[0037] If the working time Ti of a certain round is less than the preset threshold T, then the working time of that round is invalid. The main control module does not record the direction of the motor in that round, and the direction of the motor in the next round is opposite to the direction of the motor in the most recent valid working round.

[0038] For example, if the preset threshold T is set to 1 minute, the compressor pump is considered to be working effectively only if it is powered on for more than 1 minute. The main control module records the direction of the motor during this operation and controls the motor to switch directions the next time it is powered on. If the compressor pump is powered on for less than 1 minute, it is considered to be working ineffectively. The main control module does not record the direction of the motor during this operation, and the motor will still operate in this direction the next time it is powered on.

[0039] Specifically:

[0040] (1) When the compressor pump is powered on for the first time, the main control module drives the motor to rotate forward;

[0041] (2) When the compressor pump is powered off, the working time from power-on to power-off of the compressor pump is T1. Compare T1 with the preset threshold T. If T1 ≥ the preset threshold T, the main control module records the motor rotation record and executes step (4); if T1 < the preset threshold T, the main control module does not record the motor rotation record and executes step (3).

[0042] (3) When the compressor pump is powered on for the second time, the main control module drives the motor to continue rotating forward and executes step (5).

[0043] (4) When the compressor pump is powered on for the second time, the main control module drives the motor to rotate in the opposite direction, i.e., reverses, and executes step (5);

[0044] (5) When the compressor pump is powered off, the working time from power-on to power-off is T2. Compare T2 with the preset threshold T. If T2 ≥ the preset threshold T, the main control module records the motor rotation record for this time; if T2 < the preset threshold T, the main control module does not record the motor rotation record for this time.

[0045] (6) And so on.

[0046] Example 2

[0047] In this embodiment, the method for reducing piston cup wear involves recording the time from power-on to power-off of the compression pump as one working duration. The main control module records each working duration and accumulates the working duration of the motor's forward rotation as T. z The cumulative working time of the motor in reverse is T. f Each time the compressor pump is powered on, the main control module determines the time based on T. z and T f The size of the motor is used to control its direction of rotation.

[0048] When the compressor pump is powered on, if the motor rotates forward for a cumulative duration T z > Cumulative duration T of motor reversal f If the main control module controls the motor to reverse, then if the cumulative time T of the motor rotating forward is... z <Cumulative duration T of motor reversal> f Then the main control module controls the motor to rotate forward; if the cumulative time of the motor rotating forward is T... z = Cumulative time T for motor reversal f Then the main control module controls the motor to rotate forward or backward. Within the same control logic, it can be specified that as long as the motor rotates forward for a cumulative duration T, it will rotate in either direction. z = Cumulative time T for motor reversal f In this case, the main control module will control the motor to rotate forward the next time the compressor pump is powered on. Alternatively, it can be specified that the motor will rotate forward for a cumulative duration T. z = Cumulative time T for motor reversal f In this case, when the compressor pump is powered on again, the main control module will control the motor to reverse.

[0049] Specifically, the following steps are included:

[0050] a. When the compressor pump is powered on for the first time, the main control module drives the motor to rotate forward (when powered on for the first time, the motor can rotate forward or backward. If it rotates backward, just reverse the forward and reverse directions below. This will not be elaborated further).

[0051] b. When the compressor pump is powered off, the operating time from power-on to power-off is T1. The main control module records the motor rotation direction during this operation and adds it to the total forward rotation time T. z T z =T1, at this time the motor reverses and accumulates time

[0052] Long T f =0;

[0053] c. The compressor pump is powered on for the second time, at which point the motor rotates forward for a cumulative duration T. z > Cumulative duration T of motor reversal f Then the main control module controls the motor to reverse.

[0054] d. The compressor pump loses power. The operating time from power-on to power-off is T2. The main control module records this motor rotation time and adds it to the total motor reverse rotation time T. f T f =T2, at this time the motor rotates forward and accumulates time

[0055] Long T z =T1;

[0056] e. The compressor pump is powered on for the third time; compare the cumulative forward rotation time T of the motor. z Cumulative duration T of motor reversal f The size, if the cumulative time T of the motor rotating in the forward direction. z > Cumulative duration T of motor reversal f If the main control module controls the motor to reverse, then if the cumulative time T of the motor rotating forward is... z <Cumulative duration T of motor reversal> f Then the main control module controls the motor to rotate forward; if the cumulative time of the motor rotating forward is T... z = Cumulative time T for motor reversal f Then the main control module can control the electricity

[0057] The machine can rotate forward, or the motor can be controlled to rotate in reverse.

[0058] f. The compressor pump loses power. The operating time from power-on to power-off is T3. The main control module records the motor rotation direction for this operation. If the motor rotates forward for the third time, T3 is added to the cumulative forward rotation time T. z T z =T1+T3; If the motor reverses for the third time, then T3 is added to the cumulative reverse motor duration T. f ,

[0059] T f =T2 + T3;

[0060] g. Similarly, repeat steps e and f.

[0061] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method of reducing piston cup wear, characterized by: Running on an air compressor pump whose motor can rotate in both forward and reverse directions, the main control module of the compressor pump can control the direction of the motor and record the motor rotation data; after the compressor pump is powered on, the main control module controls the motor to rotate in either forward or reverse direction based on the previous motor rotation record. The time from power-on to power-off of the compression pump is recorded as the working time Ti. When Ti ≥ preset threshold T, the operation of that wheel is considered effective. The main control module records the direction of the motor of that wheel and controls the motor to reverse direction in the next operation. If the working time Ti of a certain round is less than the preset threshold T, then the working time of that round is invalid. The main control module does not record the direction of the motor in that round, and the direction of the motor in the next round is opposite to the direction of the motor in the most recent valid working round.

2. A method of reducing piston cup wear as set forth in claim 1, characterized in that: When the motor rotates forward, the point where the piston cup and cylinder have the greatest force is point A. When the motor rotates in reverse, the point where the piston cup and cylinder have the greatest force is point B, and the difference between point A and point B is 180 degrees.

3. A method of reducing piston cup wear as set forth in claim 1, characterized in that: The motor is a brushless DC motor, and the direction of the motor, whether forward or reverse, is controlled by the main control module of the compression pump.

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