CN100406728C - Refrigeration compressor oil level automatic balance and compensation device - Google Patents

Abstract

The refrigeration compressor oil level automatic balance and compensation device is respectively provided with a supplementary oil pipe (10) and a second solenoid valve (11) at the lower part of the supplementary oil tank (6). The second solenoid valve (11) communicates with the compressor through the oil pipe (12) The crankcase (13) in the engine (1) is connected to the bottom, and the upper part of the supplementary fuel tank (6) is respectively provided with a communication air pipe (3), a first electromagnetic valve (2) and an exhaust valve (4), and the communication air pipe (3 ) is connected to the upper part of the crankcase (13) in the compressor (1), and is above the oil level line of the crankcase (13), and the other port of the connecting air pipe (3) is located at the lower part of the supplementary oil tank (6), The absolute height of the other port of the communication air pipe (3) is exactly the absolute height of the oil level in the crankcase (13), and the two electromagnetic valves are controlled by the controller (14) to open and close simultaneously. The device is suitable for a single or multiple compressors working together to replenish the oil system. It can automatically balance and compensate the oil level in the compressor crankcase, thereby avoiding various accidents caused by too low or too high oil level.

Description

Refrigeration compressor oil level automatic balance and compensation device

technical field

The invention relates to a refrigeration compressor, in particular to a refrigeration compressor oil level automatic balance and compensation device.

Background technique

At present, the lack of oil in the compressor of the refrigeration system is one of the main causes of compressor failure. When the compressor runs in the absence of oil, it will cause various accidents such as "burning" or "biting" of the friction parts of the compressor, which will affect the normal operation of the compressor. Therefore, trying to stabilize the oil level in the crankcase of the compressor has become one of the guarantees for the reliable operation of the system. For a single-operating refrigeration compressor, although there is an oil pressure controller that can protect the compressor from oil shortage or oil cut-off, the oil supply to the system is basically judged by manually observing the oil sight glass on the compressor body. Whether the machine is short of oil, if the oil level is lower than the oil level line, you must manually add oil. If the operator is negligent and makes the compressor lack of oil, it may cause the compressor to malfunction. For a system with multiple compressors running in parallel, due to the need to adjust the load, the running time of each compressor is different, and the oil return of each compressor may be too much or too little. Therefore, the invention of the refrigeration compressor oil level automatic balance and compensation device is of great practical significance.

Contents of the invention

Technical problem: In order to avoid hidden dangers caused by too much or too little lubricating oil in the crankcase of the compressor, the present invention proposes an automatic oil level balance and compensation device for refrigeration compressors based on the relevant knowledge of fluid mechanics. The device is suitable for Single or multiple compressors work together to replenish the oil system, which can automatically balance and compensate the oil level in the compressor crankcase, thus avoiding various accidents caused by too low or too high oil level.

Technical solution: The technical solution adopted in the present invention is: a supplementary oil tank is added to the refrigeration compressor, the device takes the supplementary oil tank as the main body, and a supplementary oil pipe and a second electromagnetic valve are respectively provided at the bottom of the supplementary oil tank, and the second electromagnetic valve passes through The connecting oil pipe is connected to the bottom of the crankcase in the compressor, and the upper part of the supplementary oil tank is respectively provided with a connecting air pipe, a first solenoid valve and an exhaust valve. The outer end of the connecting air pipe is connected to the upper part of the crankcase in the compressor, and is located Above the oil level line of the crankcase, the inner port of the connecting air pipe is located at the lower part of the supplementary oil tank. The absolute height of the inner port of the connecting air pipe is the absolute height of the oil level in the crankcase. The first solenoid valve and the second solenoid valve are controlled by the controller to start simultaneously. close. A liquid level indicator is arranged on the side wall of the supplementary oil tank, the upper part of the liquid level indicator communicates with the upper space of the supplementary oil tank, and the lower part of the liquid level indicator communicates with the liquid in the lower part of the supplementary oil tank.

Due to the principle of the connecting device, when there is too much or too little oil returned in the crankcase, the supplementary oil tank will automatically replenish or absorb lubricating oil, so as to maintain the stability of the oil level in the compressor crankcase, so it can avoid the oil loss due to insufficient or too much oil. various accidents.

At the same time, this scheme is also applicable to multiple compressors running in parallel. A centralized supplementary oil tank is set in the multi-compressor system, and the crankcases of each compressor are respectively connected to the oil pipe and air pipe of the centralized supplementary oil tank, so as to make each unit in the unit The oil volume of the compressor can be kept constant, thus ensuring the stable operation of the compressor unit

Beneficial effect: the beneficial effect of the present invention is: it can ensure the stability of the oil level of the refrigeration compressor during the working process, and avoid the serious wear of the friction surface of the compressor due to lack of oil, and the occurrence of faults such as the jamming of the moving pair, especially for multiple compressors The effect of parallel operation is more obvious. It can automatically balance and compensate the oil level in the compressor crankcase, thus avoiding various accidents caused by too low or too high oil level.

Description of drawings

Fig. 1 is a structural schematic diagram of the liquid level automatic balance and compensation device of the present invention. Among them are: compressor 1, first solenoid valve 2, second solenoid valve 11, connecting air pipe 3, exhaust valve 4, exhaust pipe 5, supplementary oil tank 6, liquid level indicator 7, supplementary oil valve 8, oil supply pump 9. Supplementary oil pipe 10, connecting oil pipe 12, crankcase 13, and controller 14.

Detailed ways

The device of the present invention takes the supplementary oil tank 6 as the main body, and the bottom of the supplementary oil tank 6 is respectively provided with a supplementary oil pipe 10 and a second solenoid valve 11, and the second solenoid valve 11 is connected to the bottom of the crankcase 13 in the compressor 1 through a communication oil pipe 12 , the upper part of the supplementary oil tank 6 is respectively provided with a communication air pipe 3 and an exhaust valve 4, the outer end of the communication air pipe 3 is connected to the upper part of the crankcase 13 in the compressor 1, and is above the oil level line of the crankcase 13, and the communication air pipe 3 The inner port of the pump extends into the bottom of the supplementary oil tank 6, wherein the absolute height of the lower port of the connecting air pipe 3 in the supplementary oil tank 6 is the absolute height of the oil level in the crankcase 13, therefore, according to the normal oil level of the compressor crankcase The height is used to determine the elevation of the supplementary fuel tank when it is installed. Connecting air pipe 3 should be above the oil level line at the air vent of crankcase, to ensure that lubricating oil can not enter communicating air pipe 3; The supplementary oil pipe 10 and the supplementary oil tank are connected in a sealed manner to prevent lubricating oil from leaking, and the exhaust valve 4 is in a closed state during operation to ensure that the supplementary oil tank is in a sealed state; the connecting oil pipe 12 is located at the bottom of the crankcase 13 and the supplementary oil tank 6 to ensure that the lubricating oil Can smoothly enter or flow out of the crankcase 13 and supplementary oil tank 6.

Before starting up and running for the first time, the first electromagnetic valve 2 and the second electromagnetic valve 11 are in the closed state, open the replenishing oil valve 8 and the exhaust valve 4, and inject the lubricating oil into the replenishing oil tank 6 through the replenishing oil pipe 10 through the oil supply pump 9. After the liquid level in the oil tank reaches a certain height, the oil supply is stopped, and the replenishment oil valve 8 and the exhaust valve 4 are closed. When starting up and running, the controller will automatically open the first electromagnetic valve 2 and the second electromagnetic valve 11 according to the pressure of the crankcase when the pressure of the crankcase drops to the pressure of the oil supply tank. at the oil level line. When the amount of lubricating oil in the crankcase decreases, the lubricating oil will automatically flow into the crankcase 13 from the replenishing oil tank 6 through the connecting oil pipe 12, and the balance gas will pass through the oil layer of the replenishing oil tank through the connecting air pipe 3 and enter the upper space of the replenishing oil tank 6, so that the crankshaft The liquid level of the tank remains at the oil level line position. When the oil level in the crankcase 13 exceeds the controlled oil level line, the lubricating oil will automatically flow back to the supplementary oil tank 6 through the connecting oil pipe 12, so as to achieve the purpose of stabilizing the oil level. After running for a period of time, whether it is necessary to refuel the supplementary fuel tank 6 can be determined by observing the liquid level gauge 7 . When the compressor is shut down, the controller 14 will close the first electromagnetic valve 2 and the second electromagnetic valve 11 to avoid the rise of the crankcase pressure, and the gas will enter the upper space of the supplementary oil tank 6 through the connecting pipe 3 . After the compressor starts, the first electromagnetic valve 2 and the second electromagnetic valve 11 will be opened again when the pressure in the compressor crankcase 13 reaches the pressure set by the controller, and work will be restarted.

When multiple compressors use this device at the same time, pay attention to the liquid level of the crankcase of each compressor must be at the same absolute height, otherwise it may cause the oil level control of the compressor crankcase to not be at the same height, and the oil level of the compressor crankcase will be too high or too low. In addition, the liquid level constant device is not suitable for use in occasions where the controlled liquid level pressure fluctuates frequently.

Claims (2)

1. A refrigeration compressor oil level automatic balance and compensation device, characterized in that the device is based on a supplementary oil tank (6), and the bottom of the supplementary oil tank (6) is respectively provided with a supplementary oil pipe (10) and a second electromagnetic valve (11), the second solenoid valve (11) is connected to the bottom of the crankcase (13) in the compressor (1) through the connecting oil pipe (12), and the upper part of the supplementary oil tank (6) is respectively provided with a connecting air pipe (3), The first electromagnetic valve (2) and the exhaust valve (4), one end of the communication pipe (3) is connected with the upper part of the crankcase (13) in the compressor (1), and is above the oil level line of the crankcase (13), The other port of the communication air pipe (3) is located at the bottom of the supplementary oil tank (6), the absolute height of the other port of the communication air pipe (3) is the absolute height of the oil level in the crankcase (13), the first electromagnetic valve ( 2), the second solenoid valve (11) is controlled by the controller (14) to open and close simultaneously. 2. The refrigeration compressor oil level automatic balance and compensation device according to claim 1, characterized in that a liquid level indicator (7) is provided on the side wall of the supplementary oil tank (6), and the liquid level indicator ( The upper part of 7) communicates with the upper space of the supplementary oil tank (6), and the bottom of the liquid level indicator (7) communicates with the liquid at the bottom of the supplementary oil tank (6).

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