Oxygen generator motor system and oxygen generator

Abstract

The utility model relates to the technical field of oxygenerators, in particular to an oxygenerator motor system and an oxygenerator. The utility model provides a motor system of an oxygen generator, which is characterized by comprising a motor, a bearing lubrication pipeline system, a shielding gas storage tank, a compression device, at least one gas pressure sensor and a controller, the bearing lubricating pipeline system is used for conveying lubricating oil to the bearing so that the bearing can be kept in a lubricating state. The compression device has an air inlet and an air outlet. According to the oxygenerator motor system, the internal pressure value of the bearing oil seal of the motor can reach a reasonable range, so that lubricating oil cannot be adsorbed on a stator coil of the motor and cannot be adsorbed on a rotor, an insulating layer at the end part of the coil is prevented from being damaged, the lubricating oil is also prevented from entering the rotor, and the safe operation of the motor is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of oxygen concentrators, in particular to an oxygen concentrator motor system and an oxygen concentrator. Background Art

[0002] An oxygen concentrator is a machine that produces oxygen, utilizing air separation technology. Air is first compressed to a high density, then the different freezing points of its components are exploited to separate the gas and liquid at a specific temperature. This separation is then separated into oxygen and nitrogen through distillation. An oxygen concentrator primarily comprises a compressor, molecular sieve, oxygen tank, control system, power module, electrolytic cell, filter, flow meter, and controller. The motors used in the compressors of current oxygen concentrators are typically equipped with a bearing lubrication system, which injects lubricating oil into the bearings at the motor ends to ensure proper lubrication.

[0003] However, during the operation of the motor, the rotation of the axial fan will generate negative pressure inside the motor. Under the action of negative pressure, the lubricating oil may climb along the axial inside of the motor due to loose sealing of the bearing oil seal. During long-term operation, the lubricating oil is adsorbed on the stator coil of the motor, causing the insulation layer at the end of the coil to be damaged, thereby affecting the safe operation of the motor. In addition, the temperature of the rotor is relatively high when it rotates at high speed. When the lubricating oil is contaminated with the rotor, it is easy to cause the motor to catch fire. Utility Model Content

[0004] (1) The problem to be solved by the present invention is that during the operation of the motor, the rotation of the axial flow fan will generate negative pressure inside the motor. Under the action of negative pressure, the lubricating oil may climb along the axial inside of the motor due to the loose sealing of the bearing oil seal. During long-term operation, the lubricating oil is adsorbed on the stator coil of the motor, causing the insulation layer at the end of the coil to be damaged, thereby affecting the safe operation of the motor. Moreover, the temperature of the rotor is relatively high when it rotates at high speed. When the lubricating oil is contaminated with the rotor, it is easy to cause the motor to catch fire.

[0005] (2) Technical solution

[0006] An oxygen concentrator motor system, characterized by comprising a motor, a bearing lubrication piping system, a protective gas storage tank, a compression device, at least one air pressure sensor, and a controller; the motor is provided with a bearing, the bearing being equipped with a bearing oil seal; and the bearing lubrication piping system is used to deliver lubricating oil to the bearing to keep the bearing in a lubricated state;

[0007] The compression device has an air inlet and an air outlet, the protective gas storage tank is connected to the air inlet of the compression device through an air inlet pipe, the air outlet of the compression device is connected to an air injection pipe, and one end of the air injection pipe away from the compression device extends into the interior of the motor bearing oil seal, the compression device is used to compress the protective gas and inject the compressed protective gas into the interior of the motor bearing oil seal through the air injection pipe to isolate the oil circuit;

[0008] The air pressure sensor is arranged inside the motor bearing oil seal to measure the air pressure inside the motor bearing oil seal, and the compression device and the air pressure sensor are respectively connected to the controller signal.

[0009] According to one embodiment of the present invention, the oxygen concentrator motor system includes an alarm, and the alarm is connected to the controller signal.

[0010] According to one embodiment of the present invention, a valve for controlling the on-off of the gas injection pipe is installed on the gas injection pipe, and the valve is connected to the controller signal.

[0011] According to an embodiment of the present invention, the bearing lubrication pipeline system includes an oil inlet pipeline, and the oil outlet end of the oil inlet pipeline extends into the bearing chamber of the motor and is aligned with the bearing.

[0012] According to an embodiment of the present invention, the bearing lubrication pipeline system includes a pressure regulating valve installed on the oil inlet pipeline.

[0013] According to an embodiment of the present invention, a pressure gauge is installed on the oil inlet pipeline, and the pressure gauge is used to measure the oil pressure inside the bearing.

[0014] According to one embodiment of the present invention, a flow meter is installed on the gas injection pipe.

[0015] An oxygen concentrator comprises the above-mentioned oxygen concentrator motor system.

[0016] Beneficial effects of the utility model:

[0017] The utility model provides an oxygen concentrator motor system, characterized in that it includes a motor, a bearing lubrication pipeline system, a protective gas storage tank, a compression device, at least one air pressure sensor and a controller. The motor is provided with a bearing inside, and a bearing oil seal is installed on the bearing. The bearing lubrication pipeline system is used to transport lubricating oil to the bearing to keep the bearing in a lubricated state;

[0018] The compression device has an air inlet and an air outlet. The protective gas storage tank is connected to the air inlet of the compression device through an air inlet pipe. The air outlet of the compression device is connected to an air injection pipe. The end of the air injection pipe away from the compression device extends into the motor bearing oil seal. The compression device is used to compress the protective gas and inject the compressed protective gas into the motor bearing oil seal through the air injection pipe to isolate the oil circuit; the air pressure sensor is arranged inside the motor bearing oil seal to measure the air pressure inside the motor bearing oil seal. The compression device and the air pressure sensor are respectively connected to the controller signal.

[0019] When the motor is working normally, the air pressure inside the motor is in a negative pressure state. The air pressure sensor sends the measured air pressure value inside the motor bearing oil seal to the controller in real time. When the air pressure value does not reach the set range, it indicates that the air pressure at this time is lower than the oil pressure. The controller immediately controls the compression equipment to work, and the protective gas in the protective gas storage tank enters the air inlet of the compression equipment through the air inlet pipe. The compression equipment compresses the protective gas. The high-pressure protective gas compressed by the compression equipment enters the motor bearing oil seal through the air injection pipe to increase the air pressure inside the motor bearing oil seal, so that the pressure value inside the motor bearing oil seal reaches a reasonable range. Under this pressure environment, it is not enough to make the lubricating oil climb axially, so that the lubricating oil will not be adsorbed on the stator coil of the motor or on the rotor, thereby avoiding damage to the insulation layer at the coil end and avoiding the lubricating oil from entering the rotor, thereby ensuring the safe operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A structural diagram provided for an embodiment of the present utility model;

[0022] Figure 2 A structural diagram of the motor, air injection pipe, and bearing lubrication pipeline system provided in an embodiment of the present utility model;

[0023] Figure 3 For the embodiment of the utility model Figure 2 Cross-sectional view of AA in the figure.

[0024] Icons: 1. Motor; 101. Housing; 102. Stator; 103. Rotor; 104. Output shaft; 105. Bearing; 106. First end cover; 107. Second end cover; 2. Oil inlet line; 201. First branch line; 202. Second branch line; 3. Pressure gauge; 4. Pressure regulating valve; 5. Protective gas storage tank; 6. Air compressor; 7. Air inlet pipe; 8. Air injection pipe; 9. Flow meter; 10. Valve. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Example 1:

[0027] like Figure 1 As shown, embodiment 1 of the present invention provides an oxygen concentrator motor system, including a motor 1, a bearing lubrication pipeline system, a protective gas storage tank 5, a compression device, at least one air pressure sensor and a controller. A bearing 105 is provided inside the motor 1, and a bearing oil seal is installed on the bearing 105. The bearing lubrication pipeline system is used to transport lubricating oil to the bearing 105 so that the bearing 105 remains lubricated; the compression device has an air inlet and an air outlet, the protective gas storage tank 5 is connected to the air inlet of the compression device through an air inlet pipe 7, and the air outlet of the compression device is connected to an air injection pipe 8, and the air injection pipe 8 extends into the bearing oil seal of the motor 1 at one end away from the compression device. The compression device is used to compress the protective gas and inject the compressed protective gas into the bearing oil seal of the motor 1 through the air injection pipe 8 to isolate the oil circuit; the air pressure sensor is arranged inside the bearing oil seal of the motor 1 to measure the air pressure inside the bearing oil seal of the motor 1, and the compression device and the air pressure sensor are respectively connected to the controller signal.

[0028] In this embodiment, when the motor 1 is operating normally, the air pressure inside the motor 1 is in a negative pressure state, and the air pressure sensor sends the measured air pressure value inside the bearing oil seal at the end of the motor 1 to the controller in real time. When the air pressure value does not reach the set range, it indicates that the air pressure at this time is lower than the oil pressure. The controller immediately controls the compression device to work, and the protective gas in the protective gas storage tank 5 enters the air inlet of the compression device through the air inlet pipe 7. The compression device compresses the protective gas. The high-pressure protective gas compressed by the compression device enters the motor 1 bearing oil seal through the air injection pipe 8 to increase the air pressure inside the motor 1 bearing oil seal, so that the pressure value inside the motor bearing oil seal reaches a reasonable range. Under this pressure environment, it is not enough to cause the lubricating oil to climb axially, so that the lubricating oil will not be adsorbed on the stator 102 coil of the motor 1 or on the rotor 103, thereby avoiding damage to the insulation layer at the coil end and avoiding the lubricating oil from entering the rotor 103, thereby ensuring the safe operation of the motor 1.

[0029] It should be noted that the main reason for the negative pressure inside the motor 1 is the centrifugal force generated by the rotation of the rotor 103 of the motor 1. During operation, the air inside the motor 1 is subjected to the centrifugal force of the rotor 103, causing it to flow from the center of the rotor 103 outward. During this flow, the air is prevented from leaking out of the motor 1, thereby forming a negative pressure.

[0030] In this embodiment, the air pressure sensor is arranged on a side of the bearing 105 close to the first end cover 106 to more accurately measure the air pressure state inside the bearing oil seal of the motor 1.

[0031] Preferably, in order to conveniently remind the staff, an alarm is installed on the housing 101 of the motor 1. The alarm is preferably a buzzer alarm, and the buzzer alarm is connected to the controller signal. When the controller determines that the current air pressure inside the bearing oil seal of the motor 1 reaches a set range, the controller drives the buzzer alarm to sound an alarm to remind the staff.

[0032] Preferably, the compression device is an air compressor 6 having an air inlet and an air outlet. One end of an air inlet pipe 7 is connected to the air inlet of the air compressor 6, and the other end of the air inlet pipe 7 is connected to the gas outlet of the shielding gas storage tank 5. One end of an air injection pipe 8 is connected to the air outlet of the air compressor 6, and the other end of the air injection pipe 8 passes through the first end cap 106 of the motor 1 and enters the interior of the bearing oil seal of the motor 1, with the air outlet of the air injection pipe 8 aligned with the rotor 103. Shielding gas enters the air compressor 6 from the shielding gas storage tank 5 through the air inlet pipe 7. The air compressor 6 compresses the shielding gas to form high-pressure shielding gas. The high-pressure shielding gas is then passed through the air injection pipe 8 into the interior of the bearing oil seal of the motor 1, thereby increasing the internal pressure of the bearing oil seal of the motor 1 to a reasonable range and isolating the oil circuit. This prevents lubricating oil from being adsorbed on the stator 102 coil of the motor 1 or on the rotor 103, thereby ensuring the safe operation of the motor 1.

[0033] As a preferred embodiment, the protective gas stored in the protective gas storage tank 5 is either nitrogen or helium, preferably nitrogen.

[0034] like Figure 3 As shown, the motor 1 includes a housing 101, a stator 102, a rotor 103, an output shaft 104, a first end cover 106, a second end cover 107, and a bearing 105. The housing 101 is in the shape of a straight cylinder, the stator 102 is mounted in the housing 101, the rotor 103 is coaxially arranged with the stator 102 and sleeved inside the stator 102, the output shaft 104 passes through the rotor 103 and is matingly connected to the rotor 103, the first end cover 106 is sealed and mounted on the right opening of the housing 101, and a bearing 105 is mounted at the center of the first end cover 106, the second end cover 107 is sealed and mounted on the left opening of the housing 101, and a bearing 105 is provided at the center of the second end cover 107, and both ends of the output shaft 104 are matingly connected to the bearings 105 on the first end cover 106 and the second end cover 107, respectively.

[0035] It should be noted that the specific structure of the lubricating oil pipeline system varies depending on the type of motor. That is, the lubricating oil pipeline system may be different for different types of motors, but the principle is to use the lubricating oil pipeline to transport the lubricating oil to the bearing 105 inside the motor 1. In this embodiment, the lubricating oil pipeline system includes an oil inlet pipeline 2, a first branch pipeline 201, and a second branch pipeline 202. The outlet end of the oil inlet pipeline 2 is connected to the first branch pipeline 201. The end of the first branch pipeline 201 extends into the bearing chamber on the right side of the motor 1 and is aligned with the bearing 105 on the first end cover 106. An oil outlet hole is provided on the side wall of the oil inlet pipeline 2 near the outlet end. One end of the second branch pipeline 202 is connected to the oil outlet hole. The other end of the second branch pipeline 202 extends into the bearing chamber on the left side of the motor 1 and is aligned with the bearing 105 on the second end cover 107.

[0036] As a preferred embodiment, a pressure gauge 3 and a pressure regulating valve 4 are sequentially installed on the oil inlet line 2. The pressure gauge 3 is used to monitor the internal pressure of the oil inlet line 2 so as to adjust the pressure regulating valve 4 at any time. The function of the pressure regulating valve 4 is to maintain pressure stability and prevent pressure fluctuations.

[0037] It should be noted that, since the bearing 105 needs to be continuously lubricated during the operation of the motor 1, the pressure regulating valve 4 is in the normally open mode. In order to avoid the serious accident of the pressure regulating valve 4 being closed due to the worker's misoperation, resulting in the lack of oil in the bearing 105. In this embodiment, a φ4mm hole is drilled on the valve core of the pressure regulating valve 4. In this way, even if the worker's misoperation causes the pressure regulating valve 4 to be closed, the lubricating oil in the oil inlet line 2 can smoothly enter the motor 1 to lubricate the bearing 105. Moreover, due to the hole on the valve core, the oil pressure in the oil inlet line 2 is adjusted from 0.12Mpa to 0.06Mpa, which facilitates the injection of high-pressure protective gas into the oil seal of the motor 1 bearing.

[0038] Optionally, a valve body for controlling the on-off of the air inlet pipe 7 is installed. When the motor 1 is not working, the valve body on the air inlet pipe 7 is closed to cut off the communication between the protective gas storage tank 5 and the air compressor 6.

[0039] Preferably, Figure 1 As shown, a valve 10 is installed on the gas injection pipe 8. When the motor 1 is not working, the valve 10 on the gas injection pipe 8 is closed. When the motor 1 is working, the valve 10 on the gas injection pipe 8 needs to be opened. The valve 10 is preferably an electric valve, and the electric valve is connected to the controller signal. The controller gives instructions to the electric valve to control the opening and closing of the electric valve.

[0040] Furthermore, in order to monitor the amount of compressed protective gas injected into the motor 1, a flow meter 9 is installed on the gas injection pipe 8. The flow meter 9 is connected to the controller signal. The staff can understand the amount of protective gas injected into the oil seal by observing the data measured by the flow meter 9.

[0041] In this embodiment, an air pressure sensor is installed inside the bearing oil seal of motor 1. The air pressure sensor is used to detect the internal pressure of the bearing oil seal of motor 1. The air pressure sensor is connected to the controller signal, and the controller selectively turns on or off the air compressor 6 according to the measured air pressure value. Specifically, when the air pressure value does not reach the set range, indicating that the air pressure at this time is less than the oil pressure, the controller controls the air compressor 6 to turn on, the valve body on the air inlet pipe 7 to open, and the valve 10 on the air injection pipe 8 to open. When the air pressure value in motor 1 reaches the safe set range (air pressure value ≥ oil pressure value), it plays a role in isolating the oil circuit in the bearing. The controller controls the air compressor 6 to turn off and the valve 10 on the air injection pipe 8 to close. At this time, the air pressure is higher than the oil pressure.

[0042] In this embodiment, the controller used is a PLC controller.

[0043] Example 2:

[0044] The second embodiment provides an oxygen concentrator, which includes a compressor. The motor used by the compressor is the motor 1 in the first embodiment.

[0045] In the description of this utility model, it should be noted that the terms "upper" and "lower" and other terms indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An oxygen concentrator motor system, characterized in that: The invention comprises a motor (1), a bearing lubrication pipeline system, a protective gas storage tank (5), a compression device, at least one air pressure sensor and a controller, wherein a bearing (105) is provided inside the motor (1), a bearing oil seal is installed on the bearing (105), and the bearing lubrication pipeline system is used to transport lubricating oil to the bearing (105) so that the bearing (105) remains in a lubricated state; The compression device has an air inlet and an air outlet, the protective gas storage tank (5) is connected to the air inlet of the compression device through an air inlet pipe (7), the air outlet of the compression device is connected to an air injection pipe (8), and one end of the air injection pipe (8) away from the compression device extends into the interior of the bearing oil seal of the motor (1), and the compression device is used to compress the protective gas and inject the compressed protective gas into the interior of the bearing oil seal of the motor (1) through the air injection pipe (8) to isolate the oil circuit; The air pressure sensor is arranged inside the bearing oil seal of the motor (1) and is used to measure the air pressure inside the bearing oil seal of the motor (1). The compression device and the air pressure sensor are respectively connected to the controller signal.

2. An oxygen concentrator motor system according to claim 1, characterized in that: The oxygen concentrator motor system includes an alarm, which is connected to the controller signal.

3. An oxygen concentrator motor system according to claim 2, characterized in that: The gas injection pipe (8) is provided with a valve (10) for controlling its on-off function, and the valve (10) is connected to the controller signal.

4. The oxygen concentrator motor system according to claim 3, characterized in that: The bearing lubrication pipeline system comprises an oil inlet pipeline (2), the oil outlet end of the oil inlet pipeline (2) extending into the bearing chamber of the motor (1) and aligned with the bearing (105).

5. The oxygen concentrator motor system according to claim 4, characterized in that: The bearing lubrication pipeline system comprises a pressure regulating valve (4) installed on the oil inlet pipeline (2).

6. The oxygen concentrator motor system according to claim 4, characterized in that: A pressure gauge (3) is installed on the oil inlet pipeline (2), and the pressure gauge (3) is used to measure the oil pressure inside the bearing (105).

7. The oxygen concentrator motor system according to claim 1, characterized in that: A flow meter (9) is installed on the gas injection pipe (8).

8. An oxygen concentrator, characterized in that: An oxygen concentrator motor system comprising any one of claims 1-7.

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