阅读说明：本技术 一种空调制冷循环系统中的气液两相流绝热屏蔽泵 (Gas-liquid two-phase flow heat insulation shield pump in air conditioner refrigeration cycle system ) 是由 王锦杰 于 2019-12-05 设计创作，主要内容包括：本发明公开了一种空调制冷循环系统中的气液两相流绝热屏蔽泵,包括主泵、分离罐、抽气组件、进口管、出口管和引气管,主泵进口连接分离罐底部,主泵出口连接出口管,出口管上设有抽气组件,引气管一端连接抽气组件、一端连接分离罐顶部,分离罐顶部还设有进口管。抽气组件包括支路管、第一文丘里管、第二文丘里管和调压阀,第一文丘里管设置于出口管上,支路管作为出口管的并联管路一端连接在第一文丘里管的喉部,一端连接着第一文丘里管的进口端,支路管上设置第二文丘里管和调压阀,调压阀比第二文丘里管要靠近主泵,第二文丘里管的喉部连接引气管。(The invention discloses a gas-liquid two-phase flow heat insulation shield pump in an air-conditioning refrigeration circulating system, which comprises a main pump, a separation tank, an air extraction assembly, an inlet pipe, an outlet pipe and an air extraction pipe, wherein an inlet of the main pump is connected with the bottom of the separation tank, an outlet of the main pump is connected with the outlet pipe, the outlet pipe is provided with the air extraction assembly, one end of the air extraction pipe is connected with the air extraction assembly, the other end of the air extraction pipe is connected with the top of. The air exhaust assembly comprises a branch pipe, a first Venturi pipe, a second Venturi pipe and a pressure regulating valve, the first Venturi pipe is arranged on the outlet pipe, one end of the branch pipe, serving as a parallel pipeline of the outlet pipe, is connected to the throat part of the first Venturi pipe, the other end of the branch pipe is connected to the inlet end of the first Venturi pipe, the second Venturi pipe and the pressure regulating valve are arranged on the branch pipe, the pressure regulating valve is closer to the main pump than the second Venturi pipe, and the throat part of the second Venturi pipe is connected with the air.)

1. A gas-liquid two-phase flow heat insulation shield pump in an air conditioner refrigeration cycle system is characterized in that: the gas-liquid two-phase flow heat insulation shield pump comprises a main pump (1), a separation tank (2), an air suction assembly (3), an inlet pipe (4), an outlet pipe (5) and an air suction pipe (6), wherein an inlet of the main pump (1) is connected to the bottom of the separation tank (2), an outlet of the main pump (1) is connected to the outlet pipe (5), the air suction assembly (3) is arranged on the outlet pipe (5), one end of the air suction pipe (6) is connected to the air suction assembly (3) and the other end of the air suction pipe is connected to the top of the separation tank (2), and the inlet pipe (4) is.

2. A gas-liquid two-phase flow heat insulating shield pump in a refrigeration cycle system of an air conditioner according to claim 1, characterized in that: bleed subassembly (3) are including branch way pipe (31), first venturi (32), second venturi (33) and air-vent valve (34), first venturi (32) set up on outlet pipe (5), branch way pipe (31) are connected at the throat of first venturi (32) as the parallel line one end of outlet pipe (5), and the entrance point of first venturi (32) is being connected to one end, set up second venturi (33) and air-vent valve (34) on branch way pipe (31), air-vent valve (33) will be close to main pump (1) than second venturi (33), bleed pipe (6) is connected to the throat of second venturi (33).

3. A gas-liquid two-phase flow heat insulating shield pump in a refrigeration cycle system of an air conditioner according to claim 2, characterized in that: the knockout drum (2) is a barrel bag form, including a cover cap (21) and a bottom tube (22), place main pump (1) in a bottom tube (22), bottom tube (22) is under, cover cap (21) are last and link together through the fastener each other, being divided into two regions and connecting respectively import pipe (4) and outlet pipe (5) by the baffle in cover cap (21), the regional bottom of connecting in cover cap (21) inlet pipe (4) sets up the through-hole and is connected to a bottom tube (22) inner space, the electric wiring of main pump (1) passes a bottom tube (22) lateral wall face and extends to exterior space, and the electric wiring passes a bottom tube (22) department and sets up sealedly.

4. A gas-liquid two-phase flow heat insulating shield pump in a refrigeration cycle system of an air conditioner according to claim 2, characterized in that: the heat insulation shield pump for the gas-liquid two-phase flow further comprises a water return pipe (72) and an on-off valve (9), the area of the inner connection of the cover cap (21) with the outlet pipe (5) is a backflow separation area (71), the air extraction assembly (3) is located in the bottom barrel (22), one end of the water return pipe (72) is connected with the bottom of the backflow separation area (71), the other end of the water return pipe is connected with the inner space of the bottom barrel (22), and the on-off valve (9) is arranged on the water return pipe (72).

5. The gas-liquid two-phase flow heat insulating shield pump in the refrigeration cycle system of the air conditioner as set forth in claim 4, wherein: the inner side wall of the bottom cylinder (22) is provided with a ball float valve (8), and the ball float valve (8) gives signals to an on-off valve (9) and a pressure regulating valve (34) according to the surrounding water level.

6. A gas-liquid two-phase flow heat insulating shield pump in a refrigeration cycle system of an air conditioner according to claim 1, characterized in that: the main pump (1) includes an inducer (11) provided at an inlet.

7. The gas-liquid two-phase flow heat insulating shield pump in the refrigeration cycle system of the air conditioner as set forth in claim 4, wherein: the gas-liquid two-phase flow heat insulation shield pump further comprises an anti-corrosion pipe (73), wherein one end of the anti-corrosion pipe (73) is connected with the bottom of the backflow separation area (71), and the other end of the anti-corrosion pipe is connected to an inlet of the main pump (1).

8. A gas-liquid two-phase flow heat insulating shield pump in a refrigeration cycle system of an air conditioner according to claim 2, characterized in that: the first Venturi tube (32) comprises a main tube (321) and a throat tube (322), wherein the throat tube (322) extends to the central line of the main tube (321) after being inserted into the main tube (321) from the side wall of the main tube (321) and leaves an outlet at the throat part of the main tube (321).

9. A gas-liquid two-phase flow heat insulating shield pump in a refrigeration cycle system of an air conditioner according to claim 1, characterized in that: the outer surface of the separation tank (2) is wrapped with a heat-insulating layer.

Technical Field

The invention relates to the field of gas-liquid delivery pumps, in particular to a gas-liquid two-phase flow heat insulation shield pump in an air conditioner refrigeration circulating system.

Background

In the air-conditioning refrigeration cycle system, the material conveying in a liquid mixing state exists, and a general centrifugal pump is usually used for selecting the impeller hard resistance or modifying the use position of the pump on a flow path. Freon is a commonly used coolant, and is widely used in air conditioners for circulation as a refrigerant.

When the gas-liquid mixture medium is pumped by the centrifugal pump, the medium can cause larger impact on the impeller of the centrifugal pump, and is messy, the damage frequency of the impeller is high, the maintenance period is short, and the maintenance cost is high.

And through changing the pump service position for it also has the problem that can't eliminate the gas-liquid mixture state completely to keep away from the vaporization point of medium, because according to material gas-liquid equilibrium condition, always there is gaseous material under different pressures, when filling freon, still has some insoluble protective gas to mix in the coolant and follows the refrigeration cycle.

Disclosure of Invention

The invention aims to provide a gas-liquid two-phase flow heat insulation shield pump in an air conditioner refrigeration cycle system, which aims to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a gas-liquid two-phase flow heat insulation shield pump among air conditioner refrigeration cycle system, includes main pump, knockout drum, the subassembly of bleeding, import pipe, outlet pipe and bleed pipe, main pump access connection knockout drum bottom, main pump exit linkage outlet pipe are equipped with the subassembly of bleeding on the outlet pipe, bleed pipe one end is connected the subassembly of bleeding, one end is connected the knockout drum top, the knockout drum top still is equipped with import pipe.

The invention separates the medium in gas-liquid mixture state in the separating tank in advance, because the separating tank has larger volume, the flow speed is smaller when the medium flows to the position in the pumping process, the insoluble gas is separated from the liquid medium in the separating tank and is accumulated at the upper part in the separating tank, the liquid medium is accumulated at the bottom of the separating tank and is pumped away by the main pump, the liquid medium is conveyed to the next process from the outlet of the main pump under high pressure, the gas medium accumulated at the top of the separating tank is pumped and mixed together by the self flow speed of the liquid in the flowing process of the outlet pipe, thus forming continuous pumping, and the mixing ratio of the liquid and the gas medium on the outlet pipe can be adjusted by adjusting the opening of the pumping component, the liquid-gas ratio of the medium to the medium from the inlet pipe is the same, so that the liquid level in the separation tank is kept. The pipeline of the air guide pipe does not need to be too thick, and the air guide pipe is matched with the outlet pipe and the air exhaust assembly to have a certain air-liquid mixing ratio adjusting range.

Further, the air exhaust assembly comprises a branch pipe, a first Venturi pipe, a second Venturi pipe and a pressure regulating valve, the first Venturi pipe is arranged on the outlet pipe, one end of the branch pipe serving as a parallel pipeline of the outlet pipe is connected to the throat part of the first Venturi pipe, the other end of the branch pipe is connected to the inlet end of the first Venturi pipe, the second Venturi pipe and the pressure regulating valve are arranged on the branch pipe, the pressure regulating valve is closer to the main pump than the second Venturi pipe, and the throat part of the second Venturi pipe is connected with the air guide pipe.

The venturi tube is a commonly used gas-liquid mixing tube, a part of fluid with a larger flow rate flows through a main channel of the venturi tube, in the invention, the liquid medium or the medium taking the liquid as the main component flows through the Venturi tube, the flow speed of the liquid medium flowing on the main path is greatly improved in the contraction section of the throat part, according to the Bernoulli principle, the pressure of the throat part is reduced, when the pressure of the throat part is reduced to be lower than the gas pressure at the top part in the separation tank, the air exhaust function can be realized, when the pressure difference before and after the conveying of the device is not large, when the pressure differential value of the pipeline of import pipe and the external connection of outlet pipe is less promptly, the liquid that flows in venturi can easily step down to the pressure that can suction gas, also namely only need set up a venturi on the outlet pipe and connect the bleed air pipe with this venturi's throat and can accomplish the effect of bleeding, but the great operating mode of medium pressure differential that often exists in the reality: the pressure difference of the pipelines externally connected with the inlet pipe and the outlet pipe is large, and the suction vacuum caused by the change of the channel area in the Venturi pipes is often insufficient, so that the invention uses two Venturi pipes as the main part of the air extraction assembly, the pressure regulating valve on the branch pipe has the functions of pressure regulation and shunt, when the opening degree of the pressure regulating valve is adjusted, the flow resistance is large, the flow rate flowing from the main pipeline to the outlet pipe to the branch pipe is small, the flow rate in the second Venturi pipe is small, the flow rate of the gas sucked by the bleed air pipe is also reduced, and the opening degree of the pressure regulating valve is increased, the flow rate shunted by the outlet pipe to the branch pipe is large, the second Venturi pipe sucks more gas, and the flow rate of the gas sucked by the bleed air pipe is adjusted by the pressure regulating valve, on one hand, the suction function of the first Venturi pipe can reduce the, and the pressure difference caused by the resistance of the pressure regulating valve exists behind the pressure regulating valve, namely the inlet end and the outlet main pipeline of the second Venturi tube, the absolute pressure flowing on the main channel of the second Venturi tube is reduced, so that the absolute pressure at the throat part of the second Venturi tube is smaller, and the gas can be more easily sucked from the top part in the separation tank.

Furthermore, the knockout drum is the section of thick bamboo sack form, including block and end section of thick bamboo, places the main pump in the end section of thick bamboo, end section of thick bamboo is under, the block is last and link together through the fastener each other, is divided into two regions and is connected respectively import pipe and outlet pipe by the baffle in the block, sets up the through-hole in the regional bottom of connecting the inlet pipe in the block and is connected to end section of thick bamboo inner space, and the electric wiring of main pump passes end section of thick bamboo lateral wall face and extends to exterior space, and electric wiring passes end section of thick bamboo department and sets up sealedly. The separating tank of section of thick bamboo bag form has very regular appearance, all other parts all put into the separating tank, form "black box" structure, the external world only need with import pipe and outlet pipe end connect and provide the power of main pump can, all other parts wrap up, transportation and installation only need install the separating tank to suitable position can. The main pump is a conventional vertical shield pump, is arranged in the bottom cylinder in a frame or base form, and is matched with the rest parts to form a new shield pump system.

Furthermore, the gas-liquid two-phase flow heat insulation shield pump further comprises a water return pipe and an on-off valve, the area connected with the outlet pipe in the cover cap is a backflow separation area, the air exhaust assembly is located in the bottom barrel, one end of the water return pipe is connected with the bottom of the backflow separation area, the other end of the water return pipe is connected with the space in the bottom barrel, and the on-off valve is arranged on the water return pipe.

The purpose that return water pipe and on-off valve set up lies in this device from inhaling function, because the particularity of medium in the operating mode, can collect some gas groups on the pipeline often, if do not set up the return water pipe, and gas group just in time is located the import department of knockout drum again, so when not having fresh liquid medium to get into the knockout drum, original liquid medium in the knockout drum is carried away the back main pump and just can no longer play the pumping action, the liquid medium who is as working medium on the carrying outlet pipe is eliminated, the performance of this device falls into paralysis, can only rely on artifical liquid medium of pouring into and carry out the operation and reset. After the water return pipe and the on-off valve are arranged, when a user recognizes that more gas clusters are left on an inlet of the device, the on-off valve is opened to enable the backflow separation area to be communicated with the space in the bottom cylinder, liquid materials pumped by the main pump rise to the backflow separation area and then fall back into the bottom cylinder, an outlet pipe at the top of a high-pressure gas inlet separated from the backflow separation area is discharged backwards, liquid falling back into the bottom cylinder is pumped by the main pump again, gas accumulated at the top of the separation tank is sucked off again when the liquid materials pass through the air pumping assembly, more gas enters the inlet pipe, then a medium leaving the air pumping assembly is changed into a gas-liquid mixed state, the liquid is separated again in the backflow separation area, the liquid falls back, the gas flows upwards, and thus the originally accumulated liquid medium in the separation tank forms internal circulation until the gas clusters outside the inlet pipe are sucked off to enable the gas-liquid mixed medium with the conventional proportion to reach the separation tank, when new liquid comes in, the on-off valve is closed, and the work of the main pump is used for pressurization conveying instead of forming internal circulation. The internal circulation is an inefficient operation, only used for sucking gas clusters, and should be cut off in time when normal media come.

Furthermore, a float valve is arranged on the inner side wall of the bottom cylinder and gives signals to the on-off valve and the pressure regulating valve according to the water level around the float valve. The ball float valve is used for judging whether have gas group and the liquid in the knockout drum before the knockout drum whether be more than normal operating water level, and when the water level was higher in the knockout drum, the ball float valve control on-off valve closed to and the little aperture of air-vent valve, if in-process, the water level descends in the knockout drum, then should give the air-vent valve signal and make its aperture increase so that have more flows to get into the gas in the more knockout drums of branch road pipe suction. If the device stops for a period of time and is started, the water level in the separation tank is low, then the ball float valve gives a signal to the on-off valve to open the on-off valve, and after the liquid in the separation tank is used as internal circulation for a certain period, the water level rises to a certain degree and then the on-off valve is closed to enable the device to enter a normal work rhythm.

As optimization, an inducer is arranged at the inlet of the main pump. The inducer slightly pressurizes the liquid at the inlet of the main pump, preventing cavitation at the impeller inlet.

Preferably, the gas-liquid two-phase flow heat insulation shield pump further comprises an anti-corrosion pipe, wherein one end of the anti-corrosion pipe is connected with the bottom of the backflow separation area, and the other end of the anti-corrosion pipe is connected to an inlet of the main pump. The anti-corrosion pipe guides a part of pressure liquid on the outlet pipe to be mixed into liquid at the inlet of the impeller for pressurization treatment, the water pressure rises, and cavitation does not occur any more.

Preferably, the first venturi tube comprises a main tube and a throat tube, wherein the throat tube extends from the side wall of the main tube to the central line of the main tube after being inserted into the main tube, and an outlet is reserved at the throat part of the main tube. The choke extends into the central axis of the main pipe and is wrapped by external liquid, and the ejected gas can be better mixed into the liquid.

As optimization, the outer surface of the separation tank is wrapped with a heat-insulating layer. The temperature of fluid in an air conditioning system is an important parameter, most of the fluid needs heat preservation treatment, and after the heat preservation layer is arranged, heat or cold loss of a medium is prevented, so that the energy consumption of the air conditioner is reduced.

Compared with the prior art, the invention has the beneficial effects that: the gas-liquid components in the medium are separated by the separating tank, the liquid medium is deposited and pumped by the main pump, the gas accumulated on the top of the separating tank is pumped away by the venturi tube when the liquid pressurized by the main pump passes through the outlet pipe, and the gas-liquid ratio can be adjusted by the opening degree of the pressure adjusting valve. When the liquid level is lower in the knockout drum or there is the gas group before the import pipe, the on-off valve is opened, and the inside circulation of device is formed through the main pump pumping to the liquid in the knockout drum, and the gas at knockout drum top and the gas before the import pipe are taken away in the in-process suction of circulation, and the on-off valve is closed again after the gas-liquid ratio returns normally in the medium and cuts off the internal circulation, reaches from inhaling the function.

Drawings

In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

FIG. 1 is a schematic diagram of the basic process of the present invention;

FIG. 2 is a schematic view of the complete process of the present invention;

FIG. 3 is a cross-sectional structural view of the present invention;

figure 4 is a schematic diagram of the configuration of the first venturi of the present invention.

In the figure: 1-a main pump, 11-an inducer, 2-a separating tank, 21-a cover cap, 22-a bottom cylinder, 3-an air exhaust component, 31-a branch pipe, 32-a first Venturi tube, 321-a main pipe, 322-a throat pipe, 33-a second Venturi tube, 34-a pressure regulating valve, 4-an inlet pipe, 5-an outlet pipe, 6-an air entraining pipe, 71-a backflow separation zone, 72-a water return pipe, 73-an anti-corrosion pipe, 8-a ball float valve and 9-an on-off valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.

As shown in fig. 1, the heat insulation shielding pump for gas-liquid two-phase flow in the air-conditioning refrigeration cycle system comprises a main pump 1, a separation tank 2, an air pumping assembly 3, an inlet pipe 4, an outlet pipe 5 and a gas introducing pipe 6, wherein an inlet of the main pump 1 is connected to the bottom of the separation tank 2, an outlet of the main pump 1 is connected to the outlet pipe 5, the outlet pipe 5 is provided with the air pumping assembly 3, one end of the gas introducing pipe 6 is connected to the air pumping assembly 3, one end of the gas introducing pipe is connected to the top of.

The invention separates the medium in gas-liquid mixture state in the separating tank 2 in advance, because the separating tank 2 has larger volume, the flow speed is smaller when the medium flows to the position in the pumping process, the insoluble gas is separated from the liquid medium in the separating tank 2 and is accumulated at the upper part in the separating tank 2, the liquid medium accumulated at the bottom of the separating tank 2 is full liquid medium, the liquid medium is pumped by the main pump 1 and is conveyed to the next process from the outlet of the main pump 1 under high pressure, the outlet pipe 5 pumps the gaseous medium accumulated at the top in the separating tank 2 by utilizing the self flow speed of the liquid and is mixed together for conveying in the flowing process, thus forming continuous pumping and conveying, and the opening degree of the pumping and allocating component 3, the mixing ratio of liquid and gaseous medium in the outlet pipe 5 can be adjusted to be the same as the liquid-gas ratio of the medium coming from the inlet pipe 4, so that the level of the liquid in the separation tank 2 is maintained. The pipeline of the air guide pipe 6 does not need to be too thick, and the air guide pipe is matched with the outlet pipe 5 and the air exhaust assembly 3 to have a certain air-liquid mixing ratio adjusting range.

As shown in fig. 2, the bleed-off assembly 3 includes a branch pipe 31, a first venturi pipe 32, a second venturi pipe 33, and a pressure regulating valve 34, the first venturi pipe 32 is disposed on the outlet pipe 5, the branch pipe 31 serves as a parallel pipe of the outlet pipe 5, one end of the parallel pipe is connected to a throat portion of the first venturi pipe 32, the other end of the parallel pipe is connected to an inlet end of the first venturi pipe 32, the branch pipe 31 is provided with the second venturi pipe 33 and the pressure regulating valve 34, the pressure regulating valve 33 is closer to the main pump 1 than the second venturi pipe 33, and a throat portion of the second venturi pipe 33.

The venturi tube is a commonly used gas-liquid mixing tube, a part of fluid with a larger flow rate flows through a main channel of the venturi tube, in the invention, the liquid medium or the medium taking the liquid as the main component flows through the Venturi tube, the flow speed of the liquid medium flowing on the main path is greatly improved in the contraction section of the throat part, according to the Bernoulli principle, the pressure of the throat part is reduced to be lower than the gas pressure at the top part in the separation tank 2, the air exhaust function can be realized, when the pressure difference before and after the conveying of the device is not large, that is, when the pressure difference value of the pipeline externally connected with the inlet pipe 4 and the outlet pipe 5 is small, the liquid flowing in the venturi tube can be easily reduced to the pressure capable of sucking gas, that is, only a venturi tube is arranged on the outlet pipe 5 and the throat part of the venturi tube is connected with the bleed air pipe 6 to complete the air suction effect, but in practice, the working condition that the medium pressure difference is large often exists: the pressure difference between the pipelines externally connected by the inlet pipe 4 and the outlet pipe 5 is large, and the suction vacuum caused by the change of the channel area in the venturi tubes is often insufficient, so the present invention uses two venturi tubes as the main part of the air suction assembly 3, the pressure regulating valve 34 on the branch pipe 31 has the function of pressure regulating and shunting, when the opening of the pressure regulating valve 34 is adjusted, i.e. the flow resistance is large, the flow rate flowing from the main pipeline-outlet pipe 5 to the branch pipe 31 is small, so the flow rate in the second venturi tube 33 is small, the flow rate of the gas sucked through the bleed air pipe 6 is also reduced, and the opening of the pressure regulating valve 34 is increased, so the flow rate of the gas shunted to the branch pipe 31 on the outlet pipe 5 is large, the second venturi tube 33 sucks more gas, and the flow rate of the gas sucked through the bleed air pipe 6 is regulated by the pressure regulating valve 34, on the one hand, on the other hand, the, and a pressure difference caused by the resistance of the pressure regulating valve 34 exists behind the pressure regulating valve 34, namely, on the inlet end of the second venturi tube 33 and the main path of the outlet pipe 5, the absolute pressure flowing on the main channel of the second venturi tube 33 is reduced, so that the absolute pressure at the throat part of the second venturi tube 33 is smaller, and gas can be sucked from the top part in the separation tank 2 more easily.

As shown in fig. 3, the separation tank 2 is in a bag shape and comprises a cap 21 and a bottom cylinder 22, the main pump 1 is placed in the bottom cylinder 22, the bottom cylinder 22 is arranged at the lower part, the cap 21 is arranged at the upper part and is connected with each other through a fastener, the cap 21 is separated into two areas by a partition plate and is respectively connected with the inlet pipe 4 and the outlet pipe 5, a through hole is arranged at the bottom of the area connected with the inlet pipe 4 in the cap 21 and is connected with the inner space of the bottom cylinder 22, an electric connection wire of the main pump 1 extends to the outer space through the side wall surface of the bottom cylinder 22, and a seal is arranged. The cylindrical bag-shaped separating tank 2 has a regular appearance, all the other parts are placed in the separating tank 2 to form a black box structure, the external only needs to connect the tail ends of the inlet pipe 4 and the outlet pipe 5 and provide a power supply for the main pump 1, the other parts are wrapped, and the transportation and installation only needs to install the separating tank 2 to a proper position. The main pump 1 is a conventional vertical canned pump, and is installed in the bottom cylinder 22 in a frame or base form, and the main pump 1 is matched with the rest parts to form a new canned pump system.

As shown in fig. 2 and 3, the heat-insulating shield pump for gas-liquid two-phase flow further includes a water return pipe 72 and an on-off valve 9, the region connected with the outlet pipe 5 in the cap 21 is a backflow separation region 71, the air extraction component 3 is located in the bottom tube 22, one end of the water return pipe 72 is connected with the bottom of the backflow separation region 71, the other end of the water return pipe is connected with the space in the bottom tube 22, and the on-off valve 9 is arranged on the water return pipe 72.

The purpose that return water pipe 72 and on-off valve 9 set up lies in the self-priming function of this device, because the particularity of medium in the operating mode, often can collect some gas groups on the pipeline, if do not set up return water pipe 72, and gas group just in time is located the import department of knockout drum 2 again, so when not having fresh liquid medium to get into knockout drum 2, the original liquid medium in knockout drum 2 is carried away the back main pump 1 and just can no longer play the pumping action, the liquid medium who is as working medium on carrying outlet pipe 5 together eliminates, the performance of this device falls into paralysis, can only rely on the manual work to pour into liquid medium and reset. After the water return pipe 72 and the on-off valve 9 are arranged, when it is recognized that a large amount of gas mass remains at the inlet of the device, the on-off valve 9 is opened to communicate the space in the reflux separation area 71 and the bottom cylinder 22, the liquid material pumped by the main pump 1 rises to the reflux separation area 71 and then falls back into the bottom cylinder 22, the outlet pipe 5 at the top of the high-pressure gas inlet separated in the reflux separation area 71 is discharged to the rear, the liquid falling back into the bottom cylinder 22 is pumped by the main pump 1 again, some gas accumulated at the top of the separation tank 2 is pumped away again when passing through the air pumping assembly 3, more gas outside the inlet pipe 4 enters, then the medium leaving the air pumping assembly is changed into a gas-liquid mixed state, the liquid is separated again in the reflux separation area 71, the liquid falls back, and the gas flows upwards, thus, the originally accumulated liquid medium in the separation tank 2 forms an internal circulation until the gas mass outside the gas-liquid inlet pipe 4 is pumped away to enable the gas-liquid mixed medium with a conventional proportion to, when new liquid comes in, the on-off valve 9 is closed, allowing the work of the main pump 1 to be used for boost delivery rather than creating internal circulation. The internal circulation is an inefficient operation, only used for sucking gas clusters, and should be cut off in time when normal media come.

As shown in fig. 2, a float valve 8 is provided on the inner side wall of the bottom casing 22, and the float valve 8 gives signals to the on-off valve 9 and the pressure regulating valve 34 according to the water level around it. The float valve 8 is used for judging whether a gas cluster exists in front of the separation tank 2 or not and whether liquid in the separation tank 2 is above a normal working water level or not, when the water level in the separation tank 2 is high, the float valve 8 controls the on-off valve 9 to be closed, and the pressure regulating valve 34 is small in opening degree, if the water level in the separation tank 2 is lowered in the operation process, a signal is given to the pressure regulating valve 34 to enable the opening degree to be increased so that more flow enters the branch pipe 31 to suck more gas in the separation tank 2. If the device stops for a period of time and is started, the water level in the separating tank 2 is lower, then the ball float valve 8 gives a signal to the on-off valve 9 to open the on-off valve, and after the liquid in the separating tank 2 is used as internal circulation for a certain period, the water level rises to a certain degree and then the on-off valve 9 is closed to enable the device to enter a normal work rhythm.

As shown in fig. 3, an inducer 11 is provided at the inlet of the main pump 1. The inducer 11 slightly pressurizes the liquid at the inlet of the main pump 1, preventing cavitation at the impeller inlet.

In addition to the inducer 11, the cavitation at the leaf drop can be prevented by the structure of the erosion preventing tube 73: the gas-liquid two-phase flow heat insulation shield pump also comprises an anti-corrosion pipe 73, wherein one end of the anti-corrosion pipe 73 is connected with the bottom of the backflow separation area 71, and the other end is connected with the inlet of the main pump 1. The anti-corrosion pipe 73 guides a part of the pressure liquid on the outlet pipe 5 to be mixed with the liquid at the inlet of the impeller for pressurization treatment, the water pressure rises, and cavitation does not occur any more.

The first venturi tube 32 includes a main tube 321 and a throat tube 322, and the throat tube 322 extends from the side wall of the main tube 321 into the main tube 321 to the central line of the main tube 321 and leaves an outlet at the throat of the main tube 321. The throat 322 extends into the central axis of the main pipe 321 and is wrapped by external liquid, so that the ejected gas can be better mixed into the liquid.

The outer surface of the separation tank 2 is wrapped with a heat-insulating layer. The temperature of fluid in an air conditioning system is an important parameter, most of the fluid needs heat preservation treatment, and after the heat preservation layer is arranged, heat or cold loss of a medium is prevented, so that the energy consumption of the air conditioner is reduced.

The main operation process of the device is as follows: the medium entering the separation tank 2 through the inlet pipe 4 is subjected to gas-liquid separation in the separation tank 2, the liquid medium is deposited and pumped by the main pump 1, the gas accumulated on the top of the separation tank 2 is pumped away through a venturi tube when the liquid pressurized by the main pump 1 passes through the outlet pipe 5, and the gas-liquid ratio can be adjusted through the opening degree of the pressure adjusting valve 34. When the liquid level in the separating tank 2 is lower or a gas cluster exists in front of the inlet pipe 4, the on-off valve 9 is opened, liquid in the separating tank 2 forms circulation inside the device through the main pump 1 in a pumping mode, gas at the top of the separating tank 2 and gas in front of the inlet pipe 4 are pumped away in the circulation process, and the on-off valve 9 is closed to cut off the internal circulation after the gas-liquid ratio in the medium returns to be normal.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.