Oil return system suitable for water source heat pump evaporator

Abstract

The utility model discloses an oil return system suitable for a water source heat pump evaporator. The oil return system comprises the evaporator, an air pump and a compressor. An air inlet, an air outlet, an oil return port and an oil inlet are formed in the air pump; the oil inlet is communicated with an oil return pipeline of the evaporator; the air inlet is connected with a first electromagnetic valve, and the first electromagnetic valve is communicated with an external high-pressure air source; the air outlet is connected with a second electromagnetic valve, and the second electromagnetic valve is communicated with an air suction port of the compressor; and the oil return port is communicated with an air suction port of the compressor. The requirement for high and low pressure difference is lowered, the operation range is expanded, long-time blow-by of high and low pressure is avoided in the oil return process, oil can be efficiently and reliably returned, and meanwhile the energy efficiency of a unit is improved to a certain degree.

Description

Technical Field

[0001] The utility model relates to sewage treatment technology, and more specifically, to an oil return system applicable to a water source heat pump evaporator. Background Art

[0002] As Figure 1 shown, when the water source heat pump operates, the water source heat pump takes out low-temperature water from the water source through a water circulation system, and after filtration treatment, it enters the evaporator. In the evaporator, the refrigerant absorbs the heat of the water and vaporizes, thereby absorbing the heat energy of the water and reducing the water temperature. The refrigerant gas in the evaporator is mixed with the lubricating oil and is sucked by the compressor, and then the compressor outputs the high-temperature and high-pressure refrigerant gas.

[0003] In the existing water source heat pump system, as Figure 2 shown, the currently commonly used oil return adopts the form of an ejector pump, which requires a relatively large ejector pressure difference. During the ejector process, high and low pressure gas leaks, reducing the system efficiency, resulting in frequent overheating and protection shutdown, and the unit shuts down for five days a month in high-temperature days. During the operation process, it is gradually found that there are certain defects in the initial design. Summary of the Utility Model

[0004] Aiming at the defects existing in the prior art, the purpose of the utility model is to provide an oil return system applicable to a water source heat pump evaporator, which reduces the requirement of the high and low pressure difference, expands the operation range, avoids the long-term gas leakage between high and low pressures during the oil return process, can return oil efficiently and reliably, and also improves the energy efficiency of the unit to a certain extent.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An oil return system applicable to a water source heat pump evaporator includes an evaporator, an air pump and a compressor;

[0007] The air pump is provided with an air inlet, an air outlet, an oil return port and an oil inlet;

[0008] The oil inlet is communicated with the oil return pipeline of the evaporator;

[0009] A first solenoid valve is connected to the air inlet, and the first solenoid valve is communicated with an external high-pressure gas source;

[0010] A second solenoid valve is connected to the air outlet, and the second solenoid valve is communicated with the suction port of the compressor;

[0011] The oil return port is communicated with the suction port of the compressor.

[0012] Preferably, a drying filter and a check valve are further provided on the oil return pipeline.

[0013] Preferably, the air inlet and the air outlet are provided on the upper part of the air pump;

[0014] The oil return port is provided at the bottom of the air pump;

[0015] The oil inlet is provided on the side of the air pump.

[0016] Preferably, the first solenoid valve and the second solenoid valve are arranged to be connected.

[0017] A kind of oil return system applicable to the evaporator of a water source heat pump provided by the present utility model realizes the oil return function of the equipment by adding components such as an air pump, solenoid valves, check valves, etc., and controlling the opening and closing of the solenoid valves according to the operating state of the equipment. The present utility model reduces the requirement of the high and low pressure difference, expands the operating range, avoids the long-term gas cross between high and low pressures during the oil return process, can return oil efficiently and reliably, and also improves the energy efficiency of the unit to a certain extent. At the same time, the present utility model also solves the problem of gas cross, Description of the Drawings

[0018] Figure 1 is a schematic flow chart of the operation of the water source heat pump;

[0019] Figure 2 is a schematic diagram of the existing water source heat pump using an ejector pump;

[0020] Figure 3 is a schematic diagram of the oil collection process of the oil return system of the present utility model;

[0021] Figure 4 is a schematic diagram of the oil return process of the oil return system of the present utility model. Detailed Embodiments

[0022] In order to better understand the above technical solutions of the present utility model, the technical solutions of the present utility model will be further described below with reference to the drawings and embodiments.

[0023] Combined with Figure 3 and Figure 4 as shown, a kind of oil return system applicable to the evaporator of a water source heat pump provided by the present utility model includes an evaporator 1, an air pump 2 and a compressor 3.

[0024] An air inlet and an air outlet are opened on the upper part of the air pump 2, an oil return port is opened at the bottom, and an oil inlet is opened on the side.

[0025] The oil inlet of the air pump 2 is communicated with the oil return pipeline of the evaporator 1.

[0026] A drying filter 4 and a check valve 5 are further provided on the oil return pipeline of the evaporator 1.

[0027] The intake port of the air pump 2 is connected to a first solenoid valve 6, and the first solenoid valve 6 is connected to an external high-pressure gas source.

[0028] The outlet port of the air pump 2 is connected to a second solenoid valve 7, and the second solenoid valve 7 is connected to the suction port of the compressor 3.

[0029] The oil return port of the air pump 2 is connected to the suction port of the compressor 3.

[0030] The oil return system of the present utility model changes the ejector pump to an air pump 2, which can effectively reduce the loss of high-pressure gas, thereby making the oil return efficiency higher and saving a large amount of energy consumption.

[0031] The oil return system of the present utility model can remove the impurities contained in the lubricating oil output from the evaporator 1 through the dry filter 4, making the oil more pure.

[0032] In the oil return system of the present utility model, the first solenoid valve 6 and the second solenoid valve 7 are set to be connected. According to the operating conditions of the water source heat pump unit, the opening and closing states between the first solenoid valve 6 and the second solenoid valve 7 are switched, so as to achieve the efficient oil return effect of the evaporator 1.

[0033] Those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present utility model and are not used as limitations to the present utility model. As long as it is within the scope of the substantial spirit of the present utility model, changes and modifications to the above-described embodiments will fall within the scope of the claims of the present utility model.

Claims

1. An oil return system suitable for a water source heat pump evaporator, characterized in that: Includes evaporator, air pump and compressor; The air pump is provided with an air inlet, an air outlet, an oil return port and an oil inlet; The oil inlet is connected to the oil return pipeline of the evaporator; The air inlet is connected to a first solenoid valve, and the first solenoid valve is connected to an external high-pressure gas source; The air outlet is connected to a second solenoid valve, and the second solenoid valve is connected to the air intake port of the compressor; The oil return port is communicated with the air intake port of the compressor.

2. The oil return system for a water source heat pump evaporator according to claim 1, characterized in that: The oil return pipeline is also provided with a drying filter and a one-way valve.

3. The oil return system for a water source heat pump evaporator according to claim 1, characterized in that: The air inlet and the air outlet are arranged on the upper part of the air pump; The oil return port is arranged at the bottom of the air pump; The oil inlet is arranged on the side of the air pump.

4. The oil return system for a water source heat pump evaporator according to claim 1, characterized in that: The first solenoid valve and the second solenoid valve are arranged to be connected.

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