Cross ring fault detection system and method

Abstract

The present invention discloses a cross ring fault detection system, comprising: a magnet portion, arranged at the end point of the cross ring; a sensing portion, arranged at the keyway of the main bracket corresponding to the cross ring, detecting the change in magnetic field generated by the sliding of the magnet portion along the keyway and generating a sensing signal; a controller, connected to the sensing portion, receiving the sensing signal emitted by the sensing portion, and calculating the compressor speed based on the sensing signal, and judging whether the compressor has a fault by comparing the compressor speed with the message speed. The beneficial effect of the present invention is that by adding a detection device to the cross ring structure, the problem of difficulty in fault identification of the cross ring in the prior art is solved, the efficiency of cross ring fault detection and elimination is improved, the overall service life and working performance of the compressor are indirectly increased, and accidents that may be caused by cross ring fault operation are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of scroll compressors, and in particular to a cross ring fault detection system and method. Background Art

[0002] In a scroll compressor, the Oldham ring secures the orbiting scroll. As the orbiting scroll rotates in an eccentric circular motion, the Oldham ring reciprocates within the keyway as the orbiting scroll rotates. During operation, if the Oldham ring becomes stuck or breaks, it can be difficult to identify promptly and effectively. Continuing the compressor can cause further wear and heat, leading to serious damage. It can also contaminate the entire air conditioning system, making cleaning difficult.

[0003] In the prior art, the structural strength of the cross ring is often improved and the failure probability of the cross ring is reduced by optimizing the structure of the cross ring or improving the production process, but the technical problem of fault detection of the cross ring is not truly solved. Summary of the Invention

[0004] In view of the above problems existing in the prior art, a cross ring fault detection system and method are now provided.

[0005] The specific technical solutions are as follows:

[0006] A cross ring fault detection system, comprising:

[0007] The magnet portion is arranged at the end points of the cross ring;

[0008] a sensing portion, disposed at a keyway of the main bracket corresponding to the cross ring, detecting a change in the magnetic field generated by the sliding of the magnet portion along the keyway and generating a sensing signal;

[0009] The controller is connected to the sensing part, receives the sensing signal sent by the sensing part, calculates the compressor speed according to the sensing signal, and determines whether the compressor is faulty by comparing the compressor speed with a message speed.

[0010] Preferably, the sensing part is a switch type sensor or a linear sensor.

[0011] Preferably, the sensing signal output by the sensing unit is a digital signal or an analog signal.

[0012] Preferably, the magnet portion is provided on the bracket mating key or the movable plate mating key of the cross ring.

[0013] Preferably, the controller comprises:

[0014] a communication unit connecting the drive motor of the compressor and the sensing unit;

[0015] a sensing signal period calculation unit, connected to the communication unit signal and calculating the period of the sensing signal according to the sensing signal;

[0016] a rotation speed calculation unit, configured to calculate the rotation speed of the compressor according to the period of the sensing signal;

[0017] A judgment unit compares the rotation speed of the compressor with the message rotation speed and judges whether the compressor is faulty.

[0018] Preferably, the sensing portion is a linear sensor, and the controller further includes a crankshaft angle calculation unit for calculating a current crankshaft angle of the compressor according to the sensing signal.

[0019] A cross ring fault detection method specifically includes:

[0020] S1: The magnet is at the initial position and the sensor receives a reference magnetic field strength.

[0021] S2: The magnet part slides in the keyway along with the cross ring, and the sensing part generates a sensing signal according to the change of magnetic field strength;

[0022] S3: The controller receives the sensing signal and calculates the speed of the compressor;

[0023] S4: The controller compares the compressor speed with the message speed and outputs the compressor status information;

[0024] S5: Outputting fault information when the difference between the rotation speed of the compressor and the rotation speed of the message is greater than a threshold value.

[0025] Preferably, the step S2 includes: the magnet portion is arranged on the bracket matching key or the movable plate matching key of the cross ring

[0026] Preferably, the step S3 includes: when the sensing portion is a switch-type sensor, the sensing signal is a digital signal;

[0027] The controller records the digital signal period and calculates the sensed rotation speed;

[0028] When the sensing portion is a linear sensor, the sensing signal is an analog signal;

[0029] The controller records the period of the analog signal and calculates the sensed rotation speed.

[0030] Preferably, the controller uses the period of the sensing signal as the rotation period of the compressor, and calculates the sensing rotation speed according to the rotation period of the compressor.

[0031] Preferably, when the sensing part is the linear sensor, the controller calculates the crank angle of the compressor according to the analog signal.

[0032] The above technical solution has the following advantages or beneficial effects: by adding a detection device to the cross ring structure, the problem of difficulty in identifying cross ring faults in the existing technology is solved, the efficiency of cross ring fault detection and elimination is improved, and the overall service life and working performance of the compressor are indirectly improved, avoiding accidents that may be caused by cross ring fault operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The embodiments of the present invention will be described more fully with reference to the accompanying drawings, which are provided for illustration and description only and are not intended to limit the scope of the present invention.

[0034] Figure 1 is an overall schematic diagram of an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the installation positions of the magnet part and the sensor part according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of another installation position of the magnet part and the sensor part according to an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of another installation position of the magnet part and the sensor part according to an embodiment of the present invention;

[0038] Figure 5 A schematic diagram of a controller according to an embodiment of the present invention;

[0039] Figure 6 Schematic diagram of a detection method according to an embodiment of the present invention;

[0040] Figure 7 A schematic diagram of a digital signal according to an embodiment of the present invention;

[0041] Figure 8 Schematic diagram of analog signals according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0044] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0045] The present invention comprises:

[0046] A cross ring fault detection system, such as Figure 1 and Figure 2 As shown, including:

[0047] The magnet part 1 is arranged at the end point of the cross ring 3. The magnet part can be a permanent magnet, a soft magnet or an electromagnet. The magnet part 1 can be adjusted according to the actual situation to meet the requirements of material properties and magnetic field strength in different working environments.

[0048] The sensing part 2 is arranged at the key slot of the main bracket 4 corresponding to the cross ring 3, and detects the change in the magnetic field generated by the sliding of the magnet part 1 along the key slot and generates a sensing signal;

[0049] The controller 6 is connected to the sensing part 2, receives the sensing signal sent by the sensing part 2, calculates the compressor speed according to the sensing signal, and determines whether the compressor is faulty by comparing the compressor speed with a message speed.

[0050] In a preferred embodiment, the sensing part 2 is a switch-type sensor or a linear sensor. Different sensors are set to cope with different working conditions. When it is necessary to accurately measure the working condition of the cross ring 3, a linear sensor is preferably used. The crankshaft angle is recorded in real time through analog signals to achieve accurate detection of the movement state of the cross ring; when relevant components in the compressor, including bearings, crankshafts, scroll discs, etc., are worn, eccentrically worn, stuck, etc., the fault condition and fault point can be reflected in real time through the change in the analog signal, helping maintenance personnel to quickly judge the working condition of the compressor and perform maintenance work; and when there is strong signal interference in the working environment of the compressor, the linear sensor cannot well measure the accurate displacement change of the magnetic part 1, and the analog signal may be distorted during transmission. In this case, the sensing part 2 can be set to a switch-type sensor, which only detects whether the magnetic part 1 reaches a predetermined position and avoids the influence of the strong interference environment on the sensing part 2 by outputting a digital signal.

[0051] In a preferred embodiment, the sensing signal output by the sensing portion 2 is a digital signal or an analog signal.

[0052] In a preferred embodiment, Figure 2 or Figure 3As shown, the magnet portion is mounted on the bracket mating key 31 or the movable plate mating key 32 of the cross ring 3, and the sensor portion 2 is correspondingly mounted on the main bracket 4. In each of the aforementioned locations, the magnet portion 1 performs reciprocating linear motion relative to the sensor portion 2. The displacement between the magnet portion 1 and the sensor portion 2 generates corresponding changes in the magnetic field intensity at the sensor portion 2. The controller 6 determines the position of the magnet portion 1, i.e., the movement of the cross ring 3, by recording these changes in magnetic field intensity.

[0053] In another preferred embodiment, Figure 4 As shown, the sensing part 2 can also be arranged on the housing 5, which is suitable for compressors with a relatively compact volume, avoiding the defect that insufficient space in the compressor causes difficulty in arranging the sensing part 2.

[0054] In a preferred embodiment, the controller 6 determines the working status of the cross ring by comparing the rotation speed of the compressor with the sensing signal.

[0055] Specifically, the controller 6 includes:

[0056] The communication unit 61 connects the drive motor of the compressor and the sensing unit 2;

[0057] a sensing signal period calculation unit 62, which is signal-connected to the communication unit 61 and calculates the period of the sensing signal according to the sensing signal;

[0058] The speed calculation unit 63 calculates the speed of the compressor according to the period of the sensing signal;

[0059] The judgment unit 64 compares the rotation speed of the compressor with the message rotation speed and judges whether the compressor is faulty.

[0060] Furthermore, when the sensing part 2 is a linear sensor, the controller further includes a crank angle calculation unit 65 for calculating the current crank angle of the compressor according to the sensing signal.

[0061] A cross ring fault detection method, such as Figure 5 As shown, including:

[0062] S1: The magnet part 1 is at the initial position, and the sensor part 2 receives the reference magnetic field strength;

[0063] S2: The magnet part 1 slides in the keyway along with the cross ring 3, and the sensing part 2 generates a sensing signal according to the change in magnetic field strength;

[0064] S3: The controller 6 receives the sensing signal and calculates the speed of the compressor;

[0065] S4: The controller 6 compares the speed of the compressor with the message speed and outputs the status information of the compressor;

[0066] S5: When the difference between the compressor speed and the message speed is greater than the threshold value, a fault message is output.

[0067] Preferably, step S2 includes: the magnet portion 1 is arranged on the bracket mating key 31 or the movable plate mating key 32 of the cross ring 3 .

[0068] Preferably, step S3 includes: when the sensing part 2 is a switch type sensor, the sensing signal is a digital signal;

[0069] The controller 6 records the digital signal cycle and calculates the sensed speed;

[0070] When the sensing part 2 is a linear sensor, the sensing signal is an analog signal;

[0071] The controller 6 records the period of the analog signal and calculates the sensed rotation speed.

[0072] Preferably, when the sensing part 2 is a linear sensor, the controller 6 calculates the crank angle of the compressor according to the analog signal.

[0073] Specifically, the Cross Ring is slidably connected to the main bracket via a key. When the compressor's orbiting scroll performs eccentric circular motion, the Cross Ring reciprocates linearly along the direction of the key. When the magnet and sensor are closest, the current distance is recorded as S0; when the magnet and sensor are farthest apart, the current distance is recorded as S1.

[0074] In one embodiment, if Figure 5 As shown, the sensor is a switch-type sensor, and the output sensing signal is a digital signal. When the magnet reaches distance S1, the sensor outputs a digital signal "1"; when the magnet is at other distances, the sensor outputs a digital signal "0." The controller records the period of the digital signal to obtain the period of the linear reciprocating motion of the Cross Ring, and thus the rotation period T of the orbiting scroll. The orbiting scroll speed can be calculated using the formula n = 60 / T. The presence of a Cross Ring fault can be determined by comparing the orbiting scroll speed with the speed reported by the compressor.

[0075] In another embodiment, Figure 6 As shown, the sensing part is an analog sensor, and the output sensing signal is an analog signal. When the distance between the magnet parts is S1, the value of the analog signal output by the sensing part is "S1" and the corresponding crankshaft angle is θ; when the distance between the magnet parts is S0, the value of the analog signal output by the sensing part is 0. The crankshaft angle can be obtained from the value θi of the analog signal, and then the displacement of the cross ring can be calculated. The controller obtains the period of the linear reciprocating motion of the cross ring by recording the period of the analog signal, and then obtains the rotation period T of the movable scroll. The speed of the movable scroll can be calculated using the formula n=60 / T. By comparing the speed of the movable scroll and the speed of the message feedback from the compressor, it is determined whether the cross ring is faulty.

[0076] Specifically, when the difference between the rotation speed of the movable scroll and the rotation speed reported by the compressor is less than a threshold value, the compressor operates normally; when the difference between the rotation speed of the movable scroll and the rotation speed reported by the compressor is greater than a threshold value, the compressor operates normally.

[0077] In a preferred embodiment, the threshold value ranges from 50 rpm to 100 rpm.

[0078] The above are only preferred embodiments of the present invention and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A cross ring fault detection system, characterized in that: include: The magnet portion is arranged at the end points of the cross ring; a sensing portion, disposed at a keyway of the main bracket corresponding to the cross ring, detecting a change in the magnetic field generated by the sliding of the magnet portion along the keyway and generating a sensing signal; a controller connected to the sensing unit, receiving a sensing signal from the sensing unit, calculating a compressor speed based on the sensing signal, and comparing the compressor speed with a message speed to determine whether the compressor is faulty; The sensing unit records the rotation angle of the crankshaft in real time through the analog signal, and reflects the fault condition and fault point in real time through the change of the analog signal; The magnet portion is arranged on the bracket matching key of the cross ring or on the movable plate matching key; The cross ring is slidably connected to the main bracket through the main bracket matching key. When the compressor orbiting scroll performs eccentric circular motion, the cross ring performs linear reciprocating motion along the direction of the main bracket matching key. When the distance between the magnet and the sensor is the shortest, the current distance is recorded as S0; when the distance between the magnet and the sensor is the farthest, the current distance is recorded as S1; The sensing part is an analog sensor, and the output sensing signal is an analog signal; When the distance between the magnet parts is S1, the value of the analog signal output by the sensing part is "S1" and the corresponding crankshaft angle is θ; When the distance between the magnet parts is S0, the value of the analog signal output by the sensing part is 0; The crankshaft angle can be obtained by the value θi of the analog signal, and then the displacement of the Oldham ring can be calculated; The controller obtains the period of the linear reciprocating motion of the cross ring by recording the period of the analog signal, and thus obtains the rotation period T of the movable scroll; The rotation speed of the movable scroll is calculated by the formula n=60 / T; Whether the Oldham ring is faulty is determined by comparing the rotational speed of the movable scroll with the rotational speed reported by the compressor.

2. The cross ring fault detection system according to claim 1, characterized in that: The controller includes: a communication unit connecting the drive motor of the compressor and the sensing unit; a sensing signal period calculation unit, connected to the communication unit signal and calculating the period of the sensing signal according to the sensing signal; a rotation speed calculation unit, configured to calculate the rotation speed of the compressor according to the period of the sensing signal; A judgment unit compares the rotation speed of the compressor with the message rotation speed and judges whether the compressor is faulty.

3. The cross ring fault detection system according to claim 2, characterized in that: The sensing portion is a linear sensor, and the controller further includes a crank angle calculation unit for calculating a current crank angle of the compressor according to the sensing signal.

4. A cross ring fault detection method, characterized in that: The cross ring fault detection system according to any one of claims 1 to 3 specifically comprises: S1: The magnet is at the initial position and the sensor receives a reference magnetic field strength. S2: The magnet part slides in the keyway along with the cross ring, and the sensing part generates a sensing signal according to the change of magnetic field strength; S3: The controller receives the sensing signal and calculates the speed of the compressor; S4: The controller compares the compressor speed with the message speed and outputs the compressor status information; S5: Outputting fault information when the difference between the rotation speed of the compressor and the rotation speed of the message is greater than a threshold value.

5. The fault detection method according to claim 4, characterized in that: The step S3 comprises: When the sensing portion is a linear sensor, the sensing signal is an analog signal; The controller records the period of the analog signal and calculates the rotational speed according to the period of the analog signal.

6. The fault detection method according to claim 5, characterized in that: The controller uses the period of the sensing signal as the rotation period of the compressor, and calculates the rotation speed according to the rotation period of the compressor.

7. The fault detection method according to claim 5, characterized in that: When the sensing portion is the linear sensor, the controller calculates the crank angle of the compressor according to the analog signal.

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