阅读说明：本技术 带油位检测功能的压缩机及自动回油、补油的热泵系统 (Compressor with oil level detection function and automatic oil return and oil supplement heat pump system ) 是由 赵密升 周超越 刘伟飞 徐维振 于 2020-06-16 设计创作，主要内容包括：本发明公开了带油位检测功能的压缩机及自动回油、补油的热泵系统,所述压缩机包括压缩机本体和油液管,所述压缩机本体和油液管相连通,所述压缩机本体和油液管内承装有润滑油,所述油液管设有检测最低安全油位和检测基准位,所述油液管的外侧、检测最低安全油位和检测基准位之间连接有油位检测电路；所述油液管中的润滑油上升到最低安全油位及以上,油位检测电路连通；包括上述压缩机,还包括四通阀、水侧换热器、节流装置、翅片换热器以及气液分离器。本发明压缩机的油位检测电路实时检测压缩机油位,热泵系统根据压缩机油位情况,控制压缩机转速及回油点的开启关闭,达到回油、补油的目的,保证压缩机内有足够润滑油,保证系统长期平稳运行。(The invention discloses a compressor with an oil level detection function and a heat pump system capable of automatically returning and supplementing oil, wherein the compressor comprises a compressor body and an oil liquid pipe, the compressor body is communicated with the oil liquid pipe, lubricating oil is contained in the compressor body and the oil liquid pipe, the oil liquid pipe is provided with a lowest detected safe oil level and a detected reference level, and an oil level detection circuit is connected between the outer side of the oil liquid pipe, the lowest detected safe oil level and the detected reference level; the lubricating oil in the oil liquid pipe rises to the minimum safe oil level or above, and the oil level detection circuit is communicated; the compressor comprises the compressor, a four-way valve, a water side heat exchanger, a throttling device, a fin heat exchanger and a gas-liquid separator. The oil level detection circuit of the compressor detects the oil level of the compressor in real time, and the heat pump system controls the rotation speed of the compressor and the opening and closing of an oil return point according to the condition of the oil level of the compressor, so that the purposes of oil return and oil supplement are achieved, enough lubricating oil is ensured to be in the compressor, and the long-term stable operation of the system is ensured.)

1. The compressor with the oil level detection function is characterized by comprising a compressor body (1) and an oil liquid pipe (2), wherein the compressor body (1) is communicated with the oil liquid pipe (2), lubricating oil is contained in the compressor body (1) and the oil liquid pipe (2), the oil liquid pipe (2) is provided with a lowest detection safety oil level (3) and a detection reference level (4), and an oil level detection circuit (5) is connected between the outer side of the oil liquid pipe (2), the lowest detection safety oil level (3) and the detection reference level (4); the lubricating oil in the oil liquid pipe (2) rises to the minimum safe oil level (3) or above, and the oil level detection circuit (5) is communicated.

2. The compressor with oil level detecting function according to claim 1, wherein an oil level detecting circuit power supply (6) and a time relay (7) are installed in the oil level detecting circuit (5).

3. Compressor with oil level detection function according to claim 1, characterized in that the time relay (7) is connected with a control main board (8).

4. Compressor with oil level detection function according to claim 1, characterized in that the outer surface of the oil pipe (2) is graduated.

5. The compressor with the oil level detection function according to claim 1, wherein the oil level detection circuit (5) has positive and negative electrodes respectively located at the detected minimum safe oil level (3) and the detection reference level (4), the oil level detection circuit (5) is turned off when the compressor oil level is lower than the detected minimum safe oil level (3), the oil level detection circuit (5) is turned on when the compressor oil level is higher than the minimum safe oil level (3), and the control main board determines that the compressor oil level is safe.

6. An automatic oil return and oil supplement heat pump system, which is characterized by comprising the compressor of any one of the claims 1 to 5, a four-way valve (10), a water side heat exchanger (11), a throttling device (12), a fin heat exchanger (13) and a gas-liquid separator (14); the gas-liquid separator (14) is connected with an oil return connecting pipeline, the oil return connecting pipeline is respectively a first oil return connecting pipeline and a second oil return connecting pipeline, the first oil return connecting pipeline is connected with the bottom of the water side heat exchanger (11), and the second oil return connecting pipeline is connected with the lowest point of the pipeline of the fin heat exchanger (13).

7. The heat pump system capable of detecting the oil level of the compressor and automatically returning and supplementing oil according to claim 6, wherein the first oil return connection pipeline is provided with a first electromagnetic valve (15) and a first check valve (16).

8. The heat pump system capable of detecting the oil level of the compressor and automatically returning and supplementing oil according to claim 6, wherein a second electromagnetic valve (17) and a second one-way valve (18) are arranged on the second oil return connecting pipeline.

9. The heat pump system capable of detecting the oil level of the compressor and automatically returning and supplementing oil according to claim 6, wherein the operation method of the heat pump system comprises the following steps: when the oil level detection circuit (5) detects that the oil level of the oil liquid pipe (2) is lower than the lowest safe oil level (3), after the time T1, the rotating speed of the compressor (9) is increased to the oil return rotating speed, the flow rate of the system refrigerant is increased, the oil level detection circuit (5) detects that the oil level of the compressor returns to the position above the lowest safe oil level (3), and the rotating speed of the compressor (9) is reduced to the normal operation rotating speed.

10. The heat pump system capable of detecting the oil level of the compressor and automatically returning and supplementing oil according to claim 6, wherein the operation method of the heat pump system comprises the following steps: when the rotating speed of the compressor (9) is increased to the oil return rotating speed for running, and after time T1, if the oil level detection circuit (5) detects that the oil level of the compressor is lower than a safety value, the first electromagnetic valve (15) and the second electromagnetic valve (17) are opened, the pressure of the bottom of the water side heat exchanger (11) and the lowest point of the fin heat exchanger (13) is higher than the pressure in the gas-liquid separator (14), and the lubricating oil accumulated at the two positions returns to the gas-liquid separator (14) through an oil return pipeline under the drive of the pressure difference of a refrigerant; the oil level detection circuit (5) detects that the oil level of the compressor returns to be higher than the lowest safe oil level (3), the rotating speed of the compressor (9) is reduced to be the normal operating rotating speed, and the first electromagnetic valve (15) and the second electromagnetic valve (17) are closed.

Technical Field

The invention relates to the technical field of air source heat pumps, in particular to a compressor with an oil level detection function and an automatic oil return and oil supplement heat pump system.

Background

The compressor needs enough lubricating oil to lubricate parts during operation, and the commonly adopted technology of the existing heat pump system in the aspect of oil return of the compressor is as follows: 1. the running frequency of the compressor is improved, and the flow rate of the refrigerant is increased to achieve the effect of bringing the lubricating oil back to the compressor; 2. an oil separator is added in the system, the oil separator separates the refrigerant in the pipeline from the lubricating oil and sends the lubricating oil back to the compressor. The above techniques may have the following problems: after the heat pump system operates for a long time, lubricating oil can be attached to the pipe wall or accumulated at the corner of a component, the lubricating oil can not be well brought back to the compressor by simply increasing the flow rate of a refrigerant or using an oil separator, and the compressor still has the risk of oil shortage after operating for a long time.

To solve this problem, the present invention is hereby proposed.

Disclosure of Invention

The invention aims to provide a compressor with an oil level detection function, which can detect the oil level of the compressor.

The purpose of the invention can be realized by the following technical scheme:

a compressor with an oil level detection function comprises a compressor body and an oil liquid pipe, wherein the compressor body is communicated with the oil liquid pipe, lubricating oil is contained in the compressor body and the oil liquid pipe, the oil liquid pipe is provided with a lowest detected safe oil level and a detected reference level, and an oil level detection circuit is connected between the outer side of the oil liquid pipe and the lowest detected safe oil level and the detected reference level; and the lubricating oil in the oil liquid pipe rises to the minimum safe oil level or above, and the oil level detection circuit is communicated.

Further, an oil level detection circuit power supply and a time relay are installed in the oil level detection circuit.

Furthermore, the time relay is connected with a control main board.

Furthermore, scales are arranged on the outer surface of the oil pipe.

Furthermore, the positive pole and the negative pole in the oil level detection circuit are respectively located at the lowest safe oil level and the detection reference position, when the oil level of the compressor is lower than the lowest safe oil level, the oil level detection circuit is switched off, and when the oil level of the compressor is higher than the lowest safe oil level, the oil level detection circuit is switched on, and the control main board judges that the oil level of the compressor is safe.

Another object of the present invention is to provide an automatic oil return and oil supplement heat pump system, which includes the above-mentioned compressor and is capable of detecting the oil level of the compressor and automatically returning and supplementing oil.

The purpose of the invention can be realized by the following technical scheme:

a heat pump system capable of automatically returning and supplementing oil comprises the compressor, a four-way valve, a water side heat exchanger, a throttling device, a fin heat exchanger and a gas-liquid separator; the gas-liquid separator is connected with an oil return connecting pipeline, the oil return connecting pipeline is respectively a first oil return connecting pipeline and a second oil return connecting pipeline, the first oil return connecting pipeline is connected with the bottom of the water side heat exchanger, and the second oil return connecting pipeline is connected with the lowest point of the finned heat exchanger pipeline.

Furthermore, a first electromagnetic valve and a first one-way valve are arranged on the first oil return connecting pipeline.

Furthermore, a second electromagnetic valve and a second one-way valve are arranged on the second oil return connecting pipeline.

Preferably, the working method of the heat pump system is as follows: when the oil level detection circuit detects that the oil level of the oil pipe is lower than the minimum safe oil level, the rotating speed of the compressor is increased to the oil return rotating speed after time T1, the flow rate of a system refrigerant is increased, the oil level detection circuit detects that the oil level of the compressor returns to the minimum safe oil level, and the rotating speed of the compressor is reduced to the normal operation rotating speed.

Preferably, the working method of the heat pump system is as follows: when the rotating speed of the compressor is increased to the oil return rotating speed for running, and after time T1, if the oil level detection circuit detects that the oil level of the compressor is lower than a safety value, the first electromagnetic valve and the second electromagnetic valve are opened, the pressure of the bottom of the water side heat exchanger and the lowest point of the fin heat exchanger are both higher than the pressure in the gas-liquid separator, and under the drive of the pressure difference of a refrigerant, the lubricating oil accumulated at two positions returns to the gas-liquid separator through an oil; the oil level detection circuit detects that the oil level of the compressor returns to be higher than the lowest safe oil level, the rotating speed of the compressor is reduced to the normal operating rotating speed, and the first electromagnetic valve and the second electromagnetic valve are closed.

The invention has the beneficial effects that:

the oil level detection circuit of the compressor detects the oil level of the compressor in real time, the heat pump system controls the rotation speed of the compressor and the opening and closing of an oil return point according to the condition of the oil level of the compressor, the purposes of oil return and oil supplement are achieved, enough lubricating oil is guaranteed to be in the compressor, and the long-term stable operation of the system is guaranteed.

Drawings

The invention will be further described with reference to the accompanying drawings.

Fig. 1 is a block diagram showing a compressor with an oil level detecting function according to the present invention.

Fig. 2 is a view showing the structure of the compressor with the oil level detecting function according to the present invention.

Fig. 3 is a structural block diagram of the automatic oil return and oil supplement heat pump system of the invention.

Reference numerals:

1-a compressor body; 2-an oil liquid pipe; 3-minimum safe oil level; 4-reference bit; 5-oil level detection circuit; 6-circuit power supply; 7-time relay; 8, controlling the main board; 9-a compressor; a 10-four-way valve; 11-water side heat exchanger; 111-a water inlet pipe; 112-a water outlet pipe; 12-a throttling device; 13-a finned heat exchanger; 14-a gas-liquid separator; 15-a first solenoid valve; 16-a first one-way valve; 17-a second solenoid valve; 18-second one-way valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.