Compressor structure, air conditioner and control method

Abstract

The invention provides a compressor structure, an air conditioner and a control method, and the compressor structure comprises a cylinder body which is internally provided with an air suction cavity and an exhaust cavity; the rotor component is arranged in the cylinder body; the rotor part is movably arranged so as to compress air in the air suction cavity into the air exhaust cavity; the detection module is used for detecting the position of the rotor component; the detection module is used for detecting the motion state of the rotor part; and the control module controls the rotor component to rotate forwards or backwards according to the position of the rotor component and the motion state of the rotor component, and the compressor structure solves the problem that in the related technology, starting is abnormal after a compressor is shut down due to high-frequency operation failures.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a compressor structure, an air conditioner and a control method. Background Art

[0002] When the variable frequency air conditioner unit is running at high frequency, if the system and drive protection appear, it will be shut down immediately, resulting in heavy load inside the compressor. When the compressor is started again, it will start abnormally due to the heavy load. At present, this phenomenon occurs in after-sales units and laboratory tests. Therefore, it is necessary to design a compressor start control method based on reversal to reduce the probability of abnormal compressor start and improve the reliability of the unit.

[0003] In the prior art, a variable capacity fixed frequency compressor with a forward / reverse rotating motor is disclosed. According to the working mode of large / small cooling power, if it is a working mode of large cooling power, the compressor selects the forward rotation mode, and if it is a working mode of small cooling power, the compressor selects the reverse rotation mode, so as to achieve the effect of reducing noise and saving energy. However, this method is only applicable to a compressor with a specific fixed frequency and a reverse working mode, so that this method cannot be used in the field of variable frequency air conditioners.

[0004] Therefore, the prior art needs to be further developed. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and provide a compressor structure, an air conditioner and a control method to solve the problem of abnormal startup after a compressor fails to shut down due to high-frequency operation in the related art.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: providing a compressor structure, comprising:

[0007] A cylinder body, wherein the cylinder body has an air intake cavity and an air exhaust cavity;

[0008] A rotor component, the rotor component is arranged in the cylinder body; the rotor component is movably arranged to compress the gas in the suction chamber into the exhaust chamber;

[0009] A detection module, the detection module is used to detect the position of the rotor component; the detection module is used to detect the motion state of the rotor component;

[0010] A control module controls the rotor component to rotate forward or reverse according to the position of the rotor component and the motion state of the rotor component.

[0011] Furthermore, the compressor structure includes a piston component, which is relatively movably connected to the cylinder body and abuts against the rotor component; the piston component, the rotor component and the inner wall of the cylinder body form the intake cavity and the exhaust cavity.

[0012] Furthermore, the cylinder body has a accommodating cavity, and the accommodating cavity includes the air intake cavity and the air exhaust cavity; wherein the accommodating cavity is a cylindrical cavity.

[0013] Furthermore, the straight line on which the moving direction of the piston component lies is perpendicular to the axis of the accommodating chamber.

[0014] Furthermore, the rotor component is a cylindrical structure.

[0015] Furthermore, the compressor structure also includes an exhaust flange, which is movably arranged to close or open the exhaust chamber; a position sensor connected to the control module signal is arranged on the exhaust flange.

[0016] Furthermore, a pressure sensor is provided on the exhaust flange, and the pressure sensor is signal-connected to the control module.

[0017] Furthermore, the control module comprises:

[0018] Intelligent power module;

[0019] A three-phase circuit, the three-phase circuit is connected to the intelligent power module, and the three-phase circuit is connected to the rotor component; the intelligent power module is used to control the current direction of the three-phase circuit.

[0020] Furthermore, the compressor structure further comprises:

[0021] A current sensor is provided on the three-phase circuit; the current sensor is connected to the control module signal.

[0022] An air conditioner comprises a compressor structure, wherein the compressor structure is the above-mentioned compressor structure.

[0023] A control method is applicable to the above compressor structure, and the control method comprises:

[0024] Starting the compressor structure to cause the rotor component of the compressor structure to rotate forward;

[0025] Detecting the startup state of the rotor component to determine whether the compressor structure is successfully started;

[0026] If the compressor structure fails to start successfully, the rotor component is controlled to rotate in the reverse direction.

[0027] Furthermore, the method for controlling the reverse rotation of the rotor component includes:

[0028] Detecting the initial position of the compressor;

[0029] Based on the initial position, taking the rated current as the target value, at an electrical frequency of less than 1 Hz, by switching the U-phase and V-phase control phases of the three-phase circuit of the compressor structure, driving the rotor component to reverse by a preset angle;

[0030] The compressor structure is controlled to shut down for a preset time period.

[0031] Furthermore, the preset angle is 180 degrees; and / or the preset duration is 1 second.

[0032] Further, the method of detecting the startup state of the rotor component to determine whether the compressor structure is successfully started includes:

[0033] The rotation frequency of the rotor component is detected. If it still does not reach the set target frequency after a certain preset time, it is determined that the compressor structure has not been successfully started.

[0034] Beneficial effects:

[0035] 1. The compressor structure of the present invention comprises: a cylinder body, wherein the cylinder body has an air intake cavity and an air discharge cavity; a rotor component, wherein the rotor component is arranged in the cylinder body; the rotor component is movably arranged to compress the gas in the air intake cavity to the air discharge cavity; a detection module, wherein the detection module is used to detect the position of the rotor component; the detection module is used to detect the motion state of the rotor component; and a control module, wherein the control module controls the forward or reverse rotation of the rotor component according to the position of the rotor component and the motion state of the rotor component. With the above arrangement, when the compressor structure is shut down, the rotor component stops rotating and remains stationary at a certain position in the cylinder body. When the compressor structure is started again, the position where the rotor component stops will affect the gas state inside the air discharge cavity, thereby affecting the start-up of the compressor structure. Therefore, by detecting the position and motion state of the rotor component, it is determined whether the rotor component needs to be adjusted before the compressor structure is started, thereby adjusting the position of the rotor component, and solving the problem of abnormal start-up after the compressor stops due to high-frequency operation failure in the related art.

[0036] 2. The method of the present invention reduces the starting load, increases the control response time, and improves the reliability of the starting control of the variable frequency compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic structural diagram of a compressor structure adopted in an embodiment of the present invention;

[0038] Figure 2 is a schematic diagram of the state of the compressor structure adopted in the embodiment of the present invention when the startup fails;

[0039] Figure 3 is a schematic diagram of the compressor structure used in the embodiment of the present invention when it is reversed;

[0040] Figure 4 is a schematic diagram of the circuit structure of the compressor structure adopted in the embodiment of the present invention;

[0041] Figure 5 It is a schematic diagram of the structural relationship provided by an embodiment of the present invention;

[0042] Figure 6 is a flow chart of a control method provided by an embodiment of the present invention;

[0043] Figure 7 is a schematic structural diagram of an exhaust flange of a compressor structure adopted in an embodiment of the present invention;

[0044] Figure 8 It is a schematic diagram of the structure of the pressure sensor of the compressor structure adopted in the embodiment of the present invention.

[0045] The above drawings include the following reference numerals:

[0046] 1. Cylinder body; 10. Accommodating chamber; 11. Intake chamber; 12. Exhaust chamber; 2. Rotor component; 3. Detection module; 4. Control module; 5. Piston component; 6. Exhaust flange; 61. Position sensor; 7. Pressure sensor; 8. Intelligent power module; 9. Three-phase circuit; 91. Current sensor. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0048] See also Figures 1 to 5According to an embodiment of the present invention, a compressor structure is provided, including: a cylinder body 1, wherein the cylinder body 1 has an intake cavity 11 and an exhaust cavity 12; a rotor component 2, wherein the rotor component 2 is arranged in the cylinder body 1; the rotor component 2 is movably arranged to compress the gas in the intake cavity 11 into the exhaust cavity 12; a detection module 3, wherein the detection module 3 is used to detect the position of the rotor component 2; the detection module 3 is used to detect the movement state of the rotor component 2; and a control module 4, wherein the control module 4 controls the rotor component 2 to rotate forward or reverse according to the position of the rotor component 2 and the movement state of the rotor component 2.

[0049] With the above arrangement, when the compressor structure stops, the rotor component 2 stops rotating and stops at a certain position in the cylinder body 1. When the compressor structure is started again, the position where the rotor component 2 stops will affect the gas state inside the exhaust chamber 12, thereby affecting the start-up of the compressor structure. Therefore, by detecting the position and motion state of the rotor component 2, it is determined whether the rotor component 2 needs to be adjusted before the compressor structure is started, thereby adjusting the position of the rotor component 2, solving the problem of abnormal start-up after the compressor stops due to high-frequency operation failure in the related art.

[0050] In the compressor structure of this embodiment, see Figures 1 to 3 The compressor structure includes a piston component 5, which is relatively movably connected to the cylinder body 1, and the piston component 5 abuts against the rotor component 2; the piston component 5, the rotor component 2 and the inner wall of the cylinder body 1 surround the intake cavity 11 and the exhaust cavity 12.

[0051] See also Figures 1 to 3 In the compressor structure of this embodiment, the cylinder body 1 has a accommodating chamber 10, and the accommodating chamber 10 includes the intake chamber 11 and the exhaust chamber 12; wherein the accommodating chamber 10 is a cylindrical chamber.

[0052] Specifically, the accommodating cavity 10 is set as a cylindrical cavity, so that the inner wall surface of the accommodating cavity 10 is smoother, which is conducive to the start-up of the rotor component 2. At the same time, the cylindrical cavity structure is more symmetrical, which is conducive to the detection module 3 detecting the position of the rotor component 2.

[0053] In the compressor structure of this embodiment, see Figures 1 to 3 The straight line where the moving direction of the cylinder body 1 lies is perpendicular to the axis of the accommodating chamber 10 .

[0054] With the above arrangement, the straight line in which the moving direction of the cylinder body 1 lies is perpendicular to the axis of the accommodating chamber 10 , so that the overall structure inside the cylinder body 1 is more symmetrical, which is beneficial for the detection module 3 to detect the position of the rotor component 2 .

[0055] See also Figures 1 to 3 In the compressor structure of this embodiment, the rotor component 2 is a cylindrical structure.

[0056] The cylindrical rotor component 2 has a smoother appearance, which is conducive to the startup of the rotor component 2 and is more suitable for compressors that need to be started and stopped frequently. In addition, the cylindrical structure is more symmetrical, which is conducive to the detection module 3 detecting the position of the rotor component 2.

[0057] See also Figure 7 In the compressor structure of the present embodiment, the compressor structure further includes an exhaust flange 6, and the exhaust flange 6 is movably arranged to close or open the exhaust chamber 12; a position sensor 61 connected to the control module 4 signal is arranged on the exhaust flange 6.

[0058] See also Figure 7 With the above arrangement, when the compressor structure is started, the rotor component 2 squeezes the gas in the exhaust chamber 12 and discharges it from the exhaust flange 6. If the compressor fails to start, the rotor component 2 is in a state of positive shaking, and the rotor component 2 cannot discharge the gas in the exhaust chamber 12. At this time, the airflow cannot push open the exhaust flange 6, and the control module 4 cannot receive a signal, so it controls the rotor component 2 to shut down, thereby protecting the compressor structure.

[0059] In the compressor structure of this embodiment, see Figure 8 A pressure sensor 7 is provided on the exhaust flange 6 , and the pressure sensor 7 is signal-connected to the control module 4 .

[0060] With the above arrangement, when the compressor structure is started, the rotor component 2 squeezes the gas in the exhaust chamber 12 and discharges it from the exhaust flange 6. The rotor component 2 moves, and the pressure sensor 7 detects the pressure caused by the fluid flow, thereby determining whether the exhaust pressure reaches the preset value and whether the rotor component 2 is started successfully, thereby protecting the compressor structure.

[0061] In the compressor structure of this embodiment, see Figure 7 The control module 4 includes: an intelligent power module 8; a three-phase circuit 9, the three-phase circuit 9 is connected to the intelligent power module 8, and the three-phase circuit 9 is connected to the rotor component 2; the intelligent power module 8 is used to control the current direction of the three-phase circuit 9.

[0062] With the above arrangement, the intelligent power module 8 can control the forward and reverse rotation of the rotor component 2 by adjusting the current flow direction of the three-phase circuit 9, thereby conveniently controlling the direction of rotation of the rotor component 2.

[0063] See also Figure 7In the compressor structure of this embodiment, the compressor structure further includes: a current sensor 91, which is arranged on the three-phase circuit 9; and the current sensor 91 is signal-connected to the control module 4.

[0064] With the above arrangement, the current sensor 91 can detect whether the three-phase circuit 9 is operating abnormally, and detect whether the phases of the three-phase circuit 9 are swapped according to the control requirements, thereby ensuring that the rotor component 2 rotates forward and reverse according to the correct instructions.

[0065] The air conditioner of this embodiment includes a compressor structure, and the compressor structure is the above-mentioned compressor structure.

[0066] The control method of this embodiment is applicable to the above-mentioned compressor structure, and the control method includes: starting the compressor structure to make the rotor component 2 of the compressor structure rotate forward; detecting the starting state of the rotor component 2 to determine whether the compressor structure is started successfully; if the compressor structure is not started successfully, controlling the rotor component 2 to rotate in the reverse direction.

[0067] With the above arrangement, when the compressor structure stops, the rotor component 2 stops rotating and stops at a certain position in the cylinder body 1. When the compressor structure is started again, the position where the rotor component 2 stops will affect the gas state inside the exhaust chamber 12, thereby affecting the start-up of the compressor structure. Therefore, by detecting the position and motion state of the rotor component 2, it is determined whether the rotor component 2 needs to be adjusted before the compressor structure is started, thereby adjusting the position of the rotor component 2, solving the problem of abnormal start-up after the compressor stops due to high-frequency operation failure in the related art.

[0068] In the control method of this embodiment, see Figure 6 The method for controlling the reverse rotation of the rotor component 2 includes: detecting the initial position of the compressor; based on the initial position, taking the rated current as the target value, at an electrical frequency less than 1 Hz, by exchanging the U-phase and V-phase control phases of the three-phase circuit 9 of the compressor structure, driving the rotor component 2 to reverse a preset angle; controlling the compressor structure to stop for a preset time.

[0069] With the above arrangement, the rotor component 2 is driven to reverse by a preset angle by exchanging the U-phase and V-phase control phases of the three-phase circuit 9 of the compressor structure, which is simple to operate and convenient to control.

[0070] See also Figure 6 In the control method of this embodiment, the preset angle is 180 degrees; and / or the preset duration is 1s.

[0071] Specifically, when the compressor structure fails to start, the rotor shaft of the rotor component 2 is controlled to reverse the mechanical angle by 180°, so that the compressor rotor load can be reduced to a minimum.

[0072] Specifically, the compressor structure is controlled to stop for 1 second, so that the compressor is reset to a standby state from a previous abnormal startup state, so as to facilitate controlling the operation of the compressor again.

[0073] See also Figure 6 In the control method of this embodiment, the method of detecting the startup state of the rotor component 2 to determine whether the compressor structure is successfully started includes: detecting the rotation frequency of the rotor component 2, and if it still does not reach the set target frequency after a certain preset time, it is determined that the compressor structure has not been successfully started. In this way, it is convenient and accurate to determine whether the compressor structure has failed to start.

[0074] Working principle of compressor reverse start, embodiment 1:

[0075] like Figure 1 As shown, when the compressor rotor shaft is controlled by the variable frequency drive to rotate in the forward direction, the suction chamber 11 and the exhaust chamber 12 inside the cylinder body 1 of the compressor structure inhale low-temperature and low-pressure refrigerant gas and discharge high-temperature and high-pressure refrigerant gas according to each mechanical frequency.

[0076] like Figure 2 As shown, when the compressor runs at a high frequency, if a system fault or a drive fault occurs and the compressor stops suddenly, the rotor component 2 of the compressor structure is in a position where the volume of the suction chamber 11 is much larger than the volume of the exhaust chamber 12, and the refrigerant gas pressure in the exhaust chamber 12 has not reached the top opening exhaust flange. At this time, the compressor is in a heavy load state. When the compressor is started again, the variable frequency drive does not have sufficient response time, and its output starting torque is insufficient to overcome the compressor load torque, which may lead to starting overcurrent and other faults.

[0077] like Figure 3 As shown, the variable frequency drive detects the compressor rotor position and drives the rotor component 2 of the compressor structure to reverse the mechanical angle by 180°, which can greatly increase the volume of the compressor exhaust chamber 12, reduce the refrigerant gas pressure in the exhaust chamber 12, and at the same time increase the variable frequency drive output starting torque response time.

[0078] Compressor reverse start software control process, embodiment 2:

[0079] like Figure 5As shown, after the initial power-on of the variable frequency drive is completed, after receiving the compressor start-up command, the compressor starts in the forward direction. If the start is successful, the compressor enters the normal operating state. If the start fails, a voltage of a certain amplitude is injected into the 6 basic voltage vectors to detect the initial position of the compressor rotor. After the initial position is determined, the compressor rated current is used as the target value, and the compressor is dragged in an open loop to reverse the mechanical angle by 180° at an electrical frequency of less than 1 Hz, so as to increase the volume of the compressor exhaust chamber 12 and reduce the exhaust chamber 12 body pressure, thereby reducing the compressor starting load and increasing the response time of the variable frequency drive output starting torque. At this time, the compressor is started in the forward direction again, and the success probability can be greatly improved.

[0080] By designing a variable frequency compressor starting control method based on reversal, the compressor starting reliability can be greatly improved and the failure rate of after-sales and experimental testing can be reduced.

[0081] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0082] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0083] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0084] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0085] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A compressor structure, characterized in that: include: A cylinder body (1), wherein the cylinder body (1) has an air intake cavity (11) and an air exhaust cavity (12); A rotor component (2), the rotor component (2) being arranged in the cylinder body (1); the rotor component (2) being movably arranged to compress the gas in the suction chamber (11) into the exhaust chamber (12); A detection module (3), the detection module (3) being used to detect the position of the rotor component (2); the detection module (3) being used to detect the motion state of the rotor component (2); A control module (4) controls the rotor component (2) to rotate forward or reverse according to the position of the rotor component (2) and the motion state of the rotor component (2).

2. The compressor structure according to claim 1, characterized in that: The compressor structure comprises a piston component (5), the piston component (5) is relatively movably connected to the cylinder body (1), and the piston component (5) is in abutment with the rotor component (2); the piston component (5), the rotor component (2) and the inner wall of the cylinder body (1) form the suction cavity (11) and the exhaust cavity (12).

3. The compressor structure according to claim 2, characterized in that: The cylinder body (1) has a containing chamber (10), wherein the containing chamber (10) comprises the air intake chamber (11) and the air discharge chamber (12); wherein the containing chamber (10) is a cylindrical chamber.

4. The compressor structure according to claim 3, characterized in that: The straight line on which the moving direction of the piston component (5) lies is perpendicular to the axis of the accommodating chamber (10).

5. The compressor structure according to claim 1, characterized in that: The rotor component (2) is a cylindrical structure.

6. The compressor structure according to claim 1, characterized in that: The compressor structure further comprises an exhaust flange (6), wherein the exhaust flange (6) is movably arranged to close or open the exhaust chamber (12); a position sensor (61) connected to the control module signal is arranged on the exhaust flange (6).

7. The compressor structure according to claim 6, characterized in that: The exhaust flange (6) is provided with a pressure sensor (7), and the pressure sensor (7) is signal-connected to the control module (4).

8. The compressor structure according to claim 1, characterized in that: The control module (4) comprises: Intelligent power module (8); A three-phase circuit (9), the three-phase circuit (9) is connected to the intelligent power module (8), and the three-phase circuit (9) is connected to the rotor component (2); the intelligent power module (8) is used to control the current direction of the three-phase circuit (9).

9. The compressor structure according to claim 8, characterized in that: The compressor structure further comprises: A current sensor (91), the current sensor (91) being arranged on the three-phase circuit (9); the current sensor (91) being signal-connected to the control module (4).

10. An air conditioner, comprising a compressor structure, characterized in that: The compressor structure is the compressor structure according to any one of claims 1 to 9.

11. A control method, applicable to the compressor structure according to any one of claims 1 to 9, characterized in that: The control method comprises: Starting the compressor structure so that the rotor component (2) of the compressor structure rotates forward; Detecting the startup state of the rotor component (2) to determine whether the compressor structure is successfully started; If the compressor structure fails to start successfully, the rotor component (2) is controlled to rotate in the reverse direction.

12. The control method according to claim 11, characterized in that: The method for controlling the reverse rotation of the rotor component (2) comprises: Detecting the initial position of the compressor; Based on the initial position, taking the rated current as the target value, at an electrical frequency of less than 1 Hz, by switching the U-phase and V-phase control phases of the three-phase circuit (9) of the compressor structure, the rotor component (2) is driven to reverse by a preset angle; The compressor structure is controlled to shut down for a preset time period.

13. The control method according to claim 12, characterized in that: The preset angle is 180 degrees; and / or, The preset duration is 1 second.

14. The control method according to claim 11, characterized in that: The method for detecting the startup state of the rotor component (2) to determine whether the compressor structure has been successfully started comprises: The rotation frequency of the rotor component (2) is detected. If it still fails to reach the set target frequency after a certain preset time, it is determined that the compressor structure has not been successfully started.

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