Gas-liquid separator and oil return system

Abstract

The utility model relates to the technical field of heat pumps, in particular to the technical field of a gas-liquid separator and an oil return system of a heat pump unit, and particularly relates to a gas-liquid separator and an oil return system, which solve the problem that the gas-liquid separator in the heat pump unit is easy to shake and the problem of oil shortage of a compressor caused by untimely oil return. The supporting assembly comprises a plurality of mounting plates, the mounting plates are fixedly connected to the side wall, close to the bottom end, of the tank body in the circumferential direction of the tank body, and the bottoms of the mounting plates are used for being fixed to a chassis; the air inlet pipe penetrates through and is fixed at the top of the tank body; the air outlet pipe penetrates through and is fixed at the top of the tank body, and the pipe section, located in the tank body, of the air outlet pipe is in a U-shaped pipe shape.

Description

Technical Field

[0001] This invention relates to the field of heat pump technology, specifically to the field of gas-liquid separators and oil return systems for heat pump units, and more specifically to a gas-liquid separator and oil return system. Background Technology

[0002] Air source heat pumps have become a common consumer product. Among them, the gas-liquid separator in the air source heat pump unit is a very important component of the heat pump refrigeration system. Its inlet pipe is connected to the low-pressure side of the refrigeration system, and its outlet pipe is connected to the return gas port of the compressor. The cavity plays the role of gas-liquid separation during the operation of the air conditioner.

[0003] In existing heat pump units, the gas-liquid separator is fixed to the chassis by welding a connecting plate to the bottom of the tank and then securing the plate to the chassis with bolts and nuts. However, because the gas-liquid separator tank in a heat pump unit is vertically distributed, tall and slender overall, compressor vibrations during refrigeration system operation are easily transmitted to the gas-liquid separator through the return pipe. The existing fixing structure is prone to horizontal swaying, which can lead to cracking at the welded joints of the inlet and outlet pipes after prolonged operation. Furthermore, to return the refrigerant oil settled at the bottom of the tank to the compressor, the existing gas-liquid separator has a 4.5mm diameter oil return hole at the lowest point of the outlet pipe. A filter screen is installed on the oil return hole to prevent impurities from entering the outlet pipe. The refrigerant oil in the gas-liquid separator is drawn into the outlet pipe through the oil return hole and returned to the compressor along with the gaseous refrigerant. However, due to the large pressure loss and oil return resistance of the outlet pipe, the refrigeration oil tends to accumulate in the tank and expand in volume with the refrigerant mixture, which can lead to damage to the compressor due to insufficient refrigeration oil. If the oil return hole is designed with an excessively large diameter, liquid return can easily occur. Utility Model Content

[0004] This utility model provides a gas-liquid separator and an oil return system, which solves the problems of easy shaking of the gas-liquid separator in the heat pump unit and the problem of compressor oil shortage caused by untimely oil return.

[0005] This utility model is achieved through the following technical solution:

[0006] A gas-liquid separator includes a tank.

[0007] The support assembly includes multiple mounting plates, which are fixedly connected to the side wall of the tank near the bottom along the circumference of the tank body, and the bottom of the mounting plates is used to fix them to the chassis.

[0008] An air intake pipe, which passes through and is fixed to the top of the tank;

[0009] The vent pipe passes through and is fixed to the top of the tank, and the section of the pipe inside the tank is U-shaped.

[0010] Further, the mounting plate comprises two left and right vertical plates, the bottom of the two vertical plates is connected with a horizontal plate, and the horizontal plate is provided with mounting holes; the vertical plate is fixed on the sidewall of the tank body by welding.

[0011] Further, the upper section of the gas inlet pipe is a vertical pipe section vertically distributed, and the lower section is an inclined pipe section downwardly distributed; the vertical pipe section of the gas inlet pipe penetrates the top of the tank body.

[0012] Further, the angle between the inclined pipe section and the vertical pipe section of the gas inlet pipe is 120°.

[0013] The vertical pipe section of the gas inlet pipe extends out of the top of the tank body by 50-100 mm; the depth of the gas inlet pipe extending into the tank body is 1 / 5-3 / 5 of the height of the tank body; and the horizontal span of the gas inlet pipe is greater than 3 / 5 of the diameter of the tank body.

[0014] Further, the number of the mounting plates is three, which are uniformly distributed along the peripheral direction of the tank body.

[0015] An oil return system comprises the gas-liquid separator, and at least two oil return holes are arranged on the pipe wall of the gas outlet pipe along different height positions.

[0016] The bottom of the tank body is communicated with an oil return pipe, the other end of the oil return pipe is sequentially connected to the gas return pipeline of the compressor through a filter, an electromagnetic valve and a capillary tube.

[0017] The utility model has the advantages that compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The support assembly comprises a plurality of mounting plates, the plurality of mounting plates are fixedly connected to the sidewall of the tank body near the bottom end along the circumferential direction of the tank body, the bottom of the mounting plate is fixed to the bottom disc, and the mounting plate can effectively disperse the action of external force, thereby maintaining the stability of the tank body; due to the rigid structure, internal angle, constant and balanced force distribution of the mounting plate, the gas-liquid separator can uniformly disperse and bear the action of the force under the influence of pressure, tension or torsion;

[0019] At least two oil return holes are arranged on the pipe wall of the gas outlet pipe along different height positions, the oil return efficiency of the refrigerant oil in the tank body is improved, the bottom of the tank body is communicated with an oil return pipe, the other end of the oil return pipe is sequentially connected to the gas return pipeline of the compressor through a filter, an electromagnetic valve and a capillary tube, the refrigerant oil in the tank body can be introduced into the compressor at regular time intervals, the compressor is prevented from being worn due to lack of oil, and the capillary tube can depressurize and gasify the liquid refrigerant mixed with the refrigerant oil, thereby preventing the liquid refrigerant from causing liquid impact on the compressor.

[0020] 2. The upper section of the intake pipe is a vertically distributed vertical pipe section, and the lower section is an inclined pipe section that is distributed downwards. The refrigerant flowing out from the lower end of the intake pipe will not impact the refrigerant in the tank, thus avoiding disturbing the unvaporized refrigerant in the tank into the outlet pipe, thereby preventing the refrigerant from causing liquid slugging on the compressor.

[0021] 3. There are three mounting plates, which are evenly distributed along the outer periphery of the tank to ensure that the tank is limited in three directions, preventing the tank from swaying laterally and greatly improving stability.

[0022] 4. The horizontal span of the intake pipe is greater than 3 / 5 of the tank diameter, which can prevent the refrigerant discharged from the intake pipe from directly impacting the liquid surface of the tank. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the gas-liquid separator described in this utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the gas-liquid separator described in this utility model;

[0025] Figure 3 This is a schematic diagram of the oil return system described in this utility model;

[0026] In the diagram: 1. Tank body, 2. Air inlet pipe, 21. Vertical pipe section, 22. Inclined pipe section, 3. Air outlet pipe, 4. Vertical plate, 5. Horizontal plate, 6. Oil return hole, 7. Oil return pipe, 8. Solenoid valve, 9. Capillary tube. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] In the description of the utility model, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0029] Example 1

[0030] like Figures 1-2As shown, the embodiment discloses a gas-liquid separator, which comprises a tank body 1, a supporting assembly, an air inlet pipe 2 and an air outlet pipe 3. The overall profile of the tank body 1 is vertically cylindrical, the supporting assembly comprises three mounting plates, each mounting plate comprises two left and right vertical plates 4, the bottom of the two vertical plates 4 is connected with a horizontal plate 5, the horizontal plate 5 is provided with mounting holes, and the horizontal plate 5 is fixed on the bottom disc through a bolt assembly. The side edges of the two vertical plates 4 are fixed on the side wall of the tank body 1 near the bottom end by welding, so that the three mounting plates are evenly distributed along the outer circumferential direction of the tank body 1.

[0031] The air outlet pipe 3 penetrates and is fixed at the top of the tank body 1, and the pipe section of the air outlet pipe 3 in the tank body 1 is a U-shaped pipe. The upper section of the air inlet pipe 2 is a vertical pipe section 21 arranged vertically, and the lower section is an inclined pipe section 22 arranged obliquely downward. The vertical pipe section 21 of the air inlet pipe 2 penetrates and is fixed at the top of the tank body 1. In the process of designing the air inlet pipe 2, the included angle between the inclined pipe section 22 and the vertical pipe section 21 of the air inlet pipe 2 is 120°, the vertical pipe section 21 of the air inlet pipe 2 extends out of the top of the tank body 1 by 50 mm, the depth of the air inlet pipe 2 extending into the tank body 1 is 1 / 5 of the height of the tank body 1, and the horizontal span of the air inlet pipe 2 is greater than 3 / 5 of the diameter of the tank body 1.

[0032] The bottom of the three mounting plates is fixed on the bottom disc, which can effectively disperse the external force acting on the tank body 1, thereby maintaining the stability of the tank body 1. Due to the rigid structure, internal angle and constant of the mounting plate, and the distribution of balanced force, whether affected by pressure, tension or torsion, the gas-liquid separator can uniformly disperse and bear these forces through its rigid structure. The upper section of the air inlet pipe 2 is a vertical pipe section 21 arranged vertically, and the lower section is an inclined pipe section 22 arranged obliquely downward. The refrigerant flowing out of the lower end of the air inlet pipe 2 will not impact the refrigerant in the tank body 1, and the horizontal span of the air inlet pipe 2 is greater than 3 / 5 of the diameter of the tank body 1, which can avoid the refrigerant discharged by the air inlet pipe 2 from directly impacting the liquid surface of the tank body 1, avoid disturbing the unvaporized refrigerant in the tank body 1 into the air outlet pipe 3, and further avoid the liquid impact of the refrigerant on the compressor.

[0033] Embodiment 2

[0034] In order to avoid the compressor from being damaged due to lack of refrigeration oil and improve the oil return efficiency of the gas-liquid separator, the embodiment is based on the scheme of embodiment 1, and the air inlet pipe 2 is provided with a plurality of air inlet holes 23. Figures 2-3As shown, an oil return system is provided, three oil return holes 6 are machined on the pipe wall of the gas outlet pipe 3 along different height positions, the number of oil return holes in the prior art is one, and the diameter is 4.5mm, while in the embodiment, the number of oil return holes 6 is three, and the diameter of each oil return hole 6 is 1.5mm, which improves the efficiency of the refrigeration oil in the tank 1 entering the gas outlet pipe 3 through the oil return hole 6, and at the same time, avoids that a large amount of liquid refrigerant enters the oil return hole and cannot be quickly gasified. The bottom of the tank 1 is communicated with an oil return pipe 7, the other end of the oil return pipe 7 is sequentially connected to the filter, the electromagnetic valve 8 and the capillary tube 9, and then connected to the compressor gas return pipeline.

[0035] When the compressor is short of oil, the oil return pipe 7 cooperates with the electromagnetic valve to guide the refrigeration oil in the tank 1 into the compressor at regular time, avoiding the wear of the compressor due to lack of oil, and the capillary tube can depressurize and gasify the liquid refrigerant mixed with the refrigeration oil, avoiding liquid impact of the liquid refrigerant on the compressor.

Claims

1. A gas-liquid separator comprising a tank body, characterized by, The gas-liquid separator comprises a tank body, a support assembly, an air inlet pipe and an air outlet pipe. The support assembly comprises a plurality of mounting plates fixedly connected to the side wall of the tank body near the bottom end along the circumferential direction of the tank body, and the bottom of the mounting plate is fixed to the bottom disc. The air inlet pipe penetrates and is fixed to the top of the tank body. The air outlet pipe penetrates and is fixed to the top of the tank body, and the pipe segment in the tank body is a U-shaped pipe.

2. The gas-liquid separator of claim 1, wherein, The mounting plate comprises two vertical plates, and the bottom of the two vertical plates is connected with a horizontal plate, and the horizontal plate is provided with mounting holes.

3. The gas-liquid separator of claim 1, wherein, The vertical plate is fixed to the side wall of the tank body by welding.

4. The gas-liquid separator of claim 3, wherein, The upper segment of the air inlet pipe is a vertical pipe segment, and the lower segment is an inclined pipe segment. The angle between the vertical pipe segment and the inclined pipe segment is 120°.

5. The gas-liquid separator according to any one of claims 1-4, characterized in that, The vertical pipe segment of the air inlet pipe extends out of the top of the tank body by 50-100 mm.

6. An oil return system characterized by, The depth of the air inlet pipe extending into the tank body is 1 / 5-3 / 5 of the height of the tank body. The horizontal span of the air inlet pipe is greater than 3 / 5 of the diameter of the tank body. The number of mounting plates is three, which are uniformly distributed along the outer circumferential direction of the tank body. The gas-liquid separator comprises the air outlet pipe, and at least two oil return holes are arranged on the pipe wall of the air outlet pipe at different heights. The bottom of the tank body is communicated with an oil return pipe, and the other end of the oil return pipe is sequentially connected to the air return pipeline of the compressor through a filter, an electromagnetic valve and a capillary tube.

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