CN108168164A - A kind of ammonia refrigeration system gas-liquid separation oil return equipment - Google Patents

Abstract

The present invention discloses ammonia refrigeration system gas-liquid separation oil return equipment, it is trapezoidal cylinder including side wall axial cross section, the air inlet pipe in the refrigerant gas introducing cylinder for carrying refrigerant liquid and lubricating oil secretly that the connection of the air inlet on cylinder lateral wall top comes out flash-pot, the aperture that cylinder circular base covers is connect with oil-collecting packet, cylinder inner refrigerant gas is sent back to the muffler of refrigeration compressor by the gas returning port connection in cylinder circular top cover, circular top cover diameter is more than round bottom cover diameter, and muffler sidewall opening is connect with oil return hole on oil-collecting packet side wall by fuel sucking pipe；Inner barrel is close to the position installation screw type heating pipe of round bottom cover；The import that heating pipe is stretched out outside cylinder connect with refrigeration compressor vent connection, exports to take over condenser inlet and connect.The present invention forms eddy flow using the refrigerant gas of entrained liquids and lubricating oil in cylinder, realizes separation, and lubricating oil is aspirated by refrigerant gas and takes back compressor through oil pipe, ensures the reliable Effec-tive Function of refrigeration system.

Description

A gas-liquid separation and oil return equipment for ammonia refrigeration system

technical field

The invention relates to the technical field of refrigeration and refrigeration, in particular to a gas-liquid separation oil return device for an ammonia refrigeration system.

Background technique

In the field of refrigeration and refrigeration technology, large-scale ammonia refrigeration systems are widely used. In order to prevent the refrigerant liquid entrained by the refrigerant gas from entering the refrigeration compressor and causing liquid hammer accidents in the refrigeration compressor, a gas-liquid separation device is usually installed at the outlet of the evaporator. However, while the refrigerant gas at the outlet of the evaporator entrains the refrigerant liquid, it also entrains lubricating oil. If the lubricating oil is not returned to the refrigeration compressor in time, the refrigeration compressor will lack oil, the seal cannot be guaranteed, and the volumetric efficiency will decrease. Gas delivery is reduced. At the same time, the relative running surface of the refrigeration compressor cannot be lubricated well, power consumption increases, the performance of the refrigeration system and the reliability of the refrigeration compressor decrease, and the refrigerant gas mixed in the refrigerant liquid will affect the utilization space of the gas-liquid separator.

Contents of the invention

The purpose of the present invention is to aim at the technical defects existing in the prior art, and provide a gas-liquid separation and oil return equipment for ammonia refrigeration system in the technical field of refrigeration and refrigeration, so as to further improve the operation performance of the refrigeration system and ensure the reliability of the refrigeration compressor .

The technical scheme adopted for realizing the object of the present invention is as follows:

A gas-liquid separation oil return device for an ammonia refrigeration system, comprising a cylinder whose side wall has a trapezoidal axial section, and an air inlet on the side wall of the cylinder close to the edge of the circular top cover is used to connect the The refrigerant gas entrained with refrigerant liquid and lubricating oil coming out of the evaporator is introduced into the intake pipe in the cylinder, and the circular bottom cover of the cylinder is provided with a hole to connect with the oil collection bag. The air return port on the top cover is connected to the return air pipe used to send the refrigerant gas separated in the cylinder back to the refrigeration compressor. The diameter of the circular top cover is larger than the diameter of the circular bottom cover, and the diameter of the air return pipe is The opening of the side wall is connected with the oil return hole on the side wall of the oil collection bag by an oil suction pipe, and the oil suction pipe is connected with the oil collection bag and the air return pipe through a horizontal pipe section, and the vertical pipe section of the oil suction pipe is connected from the side of the oil collection bag A first-level U-shaped bend, at least one set of connected inverted U-shaped bends and graded U-shaped bends are formed toward the return air pipe; a spiral type is installed inside the cylinder near the circular bottom cover. The hot gas pipe; the inlet and outlet of the hot gas pipe protrude from the side wall of the cylinder outside the cylinder, the inlet of the hot gas pipe is connected to the exhaust pipe of the refrigeration compressor, and the outlet is connected to the inlet of the condenser Take over the connection.

The cylinder body is formed by welding a circular top cover, a circular bottom cover and a side wall, the air inlet is welded to the air intake pipe, the opening on the circular bottom cover is connected with the oil collecting bag Solder connection.

The inlet and outlet of the hot gas pipe pass through the hole on the side wall of the cylinder and are connected with the side wall by sealing and welding.

The bottom of the circular bottom cover is welded with a bracket.

In the present invention, the refrigerant gas entrained with liquid and lubricating oil is used to form a swirling flow in the cylinder, and the refrigerant gas flows out of the cylinder from the upper return air connection pipe at the center of the swirling flow. Since the density of the liquid and lubricating oil is greater than that of the gas, under the action of centrifugal force Next, the lubricating oil and liquid flow along the inner wall of the cylinder to the bottom of the cylinder, thereby effectively separating from the refrigerant gas. The lubricating oil accumulated at the bottom is sucked by the refrigerant gas and brought back to the compressor through the oil pipe with an oil return bend. In this way, it is ensured that the lubricating oil is brought back to the refrigeration compressor in time, and the liquid is prevented from entering the refrigeration compressor, thereby ensuring the reliability of the compressor. Use the exhaust heat of the refrigeration compressor to heat the refrigerant liquid and separate out the mixed refrigerant gas to ensure the reliable and efficient operation of the refrigeration system.

Description of drawings

Fig. 1 is the schematic diagram of the gas-liquid separation oil return equipment of the ammonia refrigeration system of the present invention;

FIG. 2 is a top view of FIG. 1 .

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1-2, a gas-liquid separation and oil return equipment for an ammonia refrigeration system includes:

The axial cross-section of the side wall is a trapezoidal cylinder 6, and the air inlet on the upper part of the side wall of the cylinder is connected to the cylinder for introducing the refrigerant gas entrained with refrigerant liquid and lubricating oil from the evaporator into the cylinder. The air inlet pipe 7, the circular bottom cover of the cylinder is provided with an orifice and connected with the oil collection bag 3, and the air return port on the circular top cover of the cylinder is connected to the refrigerant separated in the cylinder The gas is sent back to the air return pipe 1 of the refrigeration compressor. The diameter of the circular top cover is greater than the diameter of the circular bottom cover. Connected by the oil suction pipe 2, the oil suction pipe is connected to the oil collection bag through its first horizontal pipe section 20, and the first horizontal pipe section is connected to the first riser section 22 through a first-level U-shaped bend pipe 21, and the first riser section The second riser section 25 is connected to the second riser section 25 through the connected inverted U-bend 23 and the grading U-bend 24, and the second riser section 25 is connected to the return air pipe through the second horizontal pipe section 26; the inside of the cylinder A spiral hot gas pipe 5 is installed near the circular bottom cover; the inlet and outlet of the hot gas pipe protrude from the side wall of the cylinder outside the cylinder, and the inlet of the hot gas pipe Connect with the exhaust pipe of the refrigeration compressor, and connect the outlet with the inlet pipe of the condenser.

Wherein, the cylinder body 6 is formed by welding a circular top cover, a circular bottom cover and a side wall, and the air inlet pipe provided near the side wall of the edge of the circular top cover is welded to the air intake pipe, and the circular bottom cover The orifice provided on the cover is welded with the oil collecting bag 3 .

Wherein, the hot gas pipe 5 is placed in the cylinder body 6 near the circular bottom cover, and its inlet and outlet pass through the openings on the side wall of the cylinder body 6 and are sealed and welded with the side wall.

The size of the cylinder 6 is determined according to the refrigeration load of the refrigeration system.

It should be noted that in the present invention, the number of "S"-shaped structural pipe sections formed by inverted U-shaped bends and graded U-shaped bends formed on the vertical pipe section of the oil suction pipe 2 may be as shown in Figure 1 One group, or multiple groups, can be specifically determined according to the size of the cylinder 2, and is not limited to the embodiment shown in FIG. 1 .

Wherein, the bottom of the circular bottom cover is welded with a bracket 4 to support the cylinder 6 .

When the refrigeration system is running, the refrigerant gas from the evaporator entrains the refrigerant liquid and lubricating oil, enters the cylinder 6 through the inlet pipe 7, forms a swirl flow in the cylinder, and the gas flows out from the upper return pipe 1 at the center of the swirl flow cylinder, into the refrigeration compressor. Since the density of liquid and lubricating oil is greater than that of gas, under the action of centrifugal force, lubricating oil and liquid flow along the inner wall of the cylinder to the bottom of the cylinder. Similarly, because the density of lubricating oil is greater than that of ammonia liquid, the lubricating oil is deposited on the bottom of the cylinder In the oil collecting bag 3 at the lowest part of the bottom, the refrigerant gas is sucked into the air return pipe 1 through the oil suction pipe 2 and brought back to the compressor. The end is blocked, and a pressure difference is formed on both sides. Under the action of the pressure difference, it is brought into the inverted U-shaped bend and the graded U-shaped bend. The lubricating oil accumulates at the graded U-shaped bend. The pressure difference is formed on both sides. Under the action of the pressure difference, it is sucked into the return air pipe 1 and brought into the refrigeration compressor. The hot air pipe 5 installed in the cylinder uses the exhaust heat of the refrigeration compressor to heat the refrigerant liquid, separate and mix it into of refrigerant gas.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the protection scope of the present invention.

Claims (4)

1. a kind of ammonia refrigeration system gas-liquid separation oil return equipment, it is characterized in that, the axial cross section including side wall is the cylinder of trapezoidal shape The air inlet of body, the cylinder on the side wall at the circular top cover edge connects the entrainment system for flash-pot to be come out The refrigerant gas of cryogen liquid and lubricating oil introduces the air inlet pipe in cylinder, and the circular base of the cylinder, which covers, offers aperture It is connect with oil-collecting packet, the gas returning port in the circular top cover of the cylinder connects to send the refrigerant gas isolated in cylinder The muffler of refrigeration compressor is returned, the diameter of the circular top cover is more than the diameter of the round bottom cover, the side of the muffler Wall opening is connected with the oil return hole on the side wall of oil-collecting packet by fuel sucking pipe, the fuel sucking pipe by horizontal pipe section and oil-collecting packet and Muffler connects, and the U-shaped bend pipe of level-one, at least one set are formed with from the lateral muffler side of oil-collecting packet in the standpipe section of the fuel sucking pipe The inverted u-shaped bend pipe being connected is with being classified U-shaped bend pipe；The inside of the cylinder is equipped with close to the position of the round bottom cover The heating pipe of screw type；The import of the heating pipe is stretched out in from the side wall of the cylinder outside the cylinder with outlet, the heat The import of tracheae and vent connection connection, the outlet of refrigeration compressor are connect with the entrance sleeve of condenser.

2. ammonia refrigeration system gas-liquid separation oil return equipment according to claim 1, it is characterized in that, the cylinder is by circular top Lid, round bottom cover and sidewall weld are formed, and the air inlet welding air inlet pipe, the circular base covers the institute offered Aperture is stated to be welded to connect with oil-collecting packet.

3. ammonia refrigeration system gas-liquid separation oil return equipment according to claim 1, it is characterized in that, the heating pipe into and out of Mouth passes through the aperture on the side wall of the cylinder and is connect with side wall sealing welding.

4. ammonia refrigeration system gas-liquid separation oil return equipment according to claim 1, it is characterized in that, the bottom of the round bottom cover Portion is welded with stent.