CN118874001A - A separation type gas-liquid two-phase pumping system - Google Patents

Abstract

The application relates to a separation type gas-liquid two-phase pumping system, and belongs to the technical field of centrifugal pumps. The separation type gas-liquid two-phase pumping system comprises: a front end processing mechanism, a middle processing mechanism and a rear end processing mechanism; the front-end treatment mechanism can be used for carrying out primary separation on the gas-liquid two-phase medium. The middle treatment mechanism is connected with the front-end treatment mechanism and can convey the liquid phase after primary separation and convey the gas phase; the middle treatment mechanism is connected with a system outlet pipeline and can convey the treated liquid phase to a target position. One end of the rear end treatment mechanism is connected with the middle treatment mechanism, and the other end of the rear end treatment mechanism is connected with a system outlet pipeline; the device is also provided with a second separation structure, and the second separation structure carries out secondary separation on the gas phase entering the rear end treatment mechanism from the middle treatment mechanism; the liquid phase processed in the back-end processing mechanism can be conveyed to a system outlet pipeline. The gas-liquid two-phase pumping system provided by the application is used for conveying a gas-liquid two-phase medium.

Description

A separation type gas-liquid two-phase pumping system

Technical Field

The invention relates to the technical field of centrifugal pumps, and in particular to a separation type gas-liquid two-phase pumping system.

Background Art

In the new chemical industry, due to the needs of chemical processes or in the process of chemical reactions, gas-liquid two-phase media will be produced in the chemical medium. Since there is a huge difference in density between the gas phase and the liquid phase in the gas-liquid two-phase medium, the flow speed of the gas phase and the liquid phase in the pump body is different, and the two phases are prone to interphase slippage. The gas phase is easy to block the pump body flow channel, affecting the normal operation of the pump body. Therefore, the traditional pump body cannot transport gas-liquid two-phase media.

There are two common solutions in the prior art. The first is to use a positive displacement pump (such as a screw pump) to achieve gas-liquid mixed transportation, but it is not possible to achieve large-flow transportation. The second is to use a centrifugal pump with special hydraulic design and structural practice to achieve gas-liquid mixed transportation, but it is not possible to achieve the transportation of two-phase media with high gas content.

Summary of the invention

The present invention provides a separation type gas-liquid two-phase pumping system, which can realize the transportation of two-phase media with large flow rate and high gas content.

The separation type gas-liquid two-phase pumping system provided by the present application includes: a front-end processing mechanism, a middle processing mechanism and a back-end processing mechanism; wherein the front-end processing mechanism is provided with a first separation structure, and the gas-liquid two-phase medium entering the front-end processing mechanism is preliminarily separated by the first separation structure. The middle processing mechanism is connected to the front-end processing mechanism, and the middle processing mechanism separates the gas-liquid two-phase medium entering the middle processing mechanism through the front-end processing mechanism; the middle processing mechanism is connected to the system outlet pipeline, which is used to transport the liquid phase after being processed by the middle processing mechanism to the target position. The back-end processing mechanism, one end of the back-end processing mechanism is connected to the middle processing mechanism, and the other end is connected to the system outlet pipeline; the back-end processing mechanism is provided with a second separation structure, and the second separation structure separates the gas phase entering the back-end processing mechanism from the middle processing mechanism again; the treated liquid phase in the back-end processing mechanism can be transported to the system outlet pipeline.

The separation type gas-liquid two-phase pumping system provided by the present application is provided with a front-end processing mechanism, which performs preliminary separation on the gas-liquid two-phase medium before the gas-liquid two-phase medium enters the middle processing mechanism, greatly reducing the gas content in the middle processing mechanism; the gas-liquid two-phase medium is reprocessed by the middle processing mechanism; and the back-end processing mechanism is provided, which can perform secondary gas-liquid separation. Such a configuration prevents most of the gas phase from entering the middle processing mechanism, thereby realizing the transportation of the two-phase medium with large flow, high head and high gas content.

In a possible implementation of the present application, the front-end processing mechanism includes a first gas-liquid separator, and the first gas-liquid separator is connected to an inlet flow pipeline; a first separation structure is arranged in the first gas-liquid separator.

In one possible implementation of the present application, the middle processing mechanism includes a pump body, a liquid phase discharge pipeline is arranged between the pump body and the first gas-liquid separator, one end of the liquid phase discharge pipeline is connected to the first gas-liquid separator, and the other end is connected to the pump body; along the discharge direction of the gas in the pump body, the pump body is sequentially connected with a main impeller, an impeller cover, a secondary impeller and a pump cover; the pump body is provided with a pump shaft, and the main impeller and the secondary impeller are both connected to the pump shaft; wherein, the position of the main impeller on the pump body is connected with a system outlet pipeline; an exhaust hole is arranged at a position corresponding to the secondary impeller on the main impeller, an exhaust and intake disc is installed at a position corresponding to the impeller cover on the secondary impeller, and the secondary impeller is eccentrically arranged with the impeller cover; an air cavity is arranged at a position corresponding to the main impeller on the pump cover, and the air cavity is connected with the rear-end processing mechanism.

In one possible implementation of the present application, the back-end processing mechanism includes a second gas-liquid separator, which is provided with a second separation structure; wherein a pump back-end exhaust pipeline is provided between the second gas-liquid separator and the air cavity, one end of the pump back-end exhaust pipeline is connected to the air cavity, and the other end is connected to the second gas-liquid separator; an outlet gas-liquid separator drain pipeline is provided between the second gas-liquid separator and the system outlet pipeline, one end of the outlet gas-liquid separator drain pipeline is connected to the second gas-liquid separator, and the other end is connected to the system outlet pipeline.

In one possible implementation of the present application, the inlet flow pipeline is provided with a system inlet control valve, the pump rear end exhaust pipeline is provided with a rear end control valve, and the outlet gas-liquid separator discharge pipeline is provided with an outlet gas-liquid separation control valve.

In a possible implementation of the present application, both the first gas-liquid separator and the second gas-liquid separator are provided with a pressure monitoring alarm.

In a possible implementation of the present application, the first gas-liquid separator and the second gas-liquid separator are both connected to an overflow pipe, the overflow pipe is equipped with an overflow sight glass, and the overflow pipe is equipped with an overflow valve; the system outlet pipeline is provided with a system outlet control valve; the first gas-liquid separator and the second gas-liquid separator are both provided with a liquid level monitor, a pump outlet reflux pipeline is provided between the first gas-liquid separator and the system outlet pipeline, one end of the pump outlet reflux pipeline is connected to the first gas-liquid separator, and the other end is connected to the system outlet pipeline, and the pump outlet reflux pipeline is provided with a reflux control valve; the reflux control valve, the system outlet control valve, and the overflow valve are electrically connected to the liquid level monitor.

In one possible implementation of the present application, the inlet flow pipeline is provided with a gas content monitoring device, and the rear-end control valve, outlet gas-liquid separation control valve, reflux control valve, system outlet control valve, and overflow valve are all electrically connected to the gas content monitoring device.

One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

(1) The present application is provided with a first gas-liquid separator, which realizes the separation of gas-liquid two-phase medium before the gas-liquid two-phase medium enters the pump body, thereby reducing the gas content entering the pump body and reducing the probability of the pump body being blocked.

(2) The present application configures the pump body as a vertical pump. Through the positional relationship between the vertical pump and the first gas-liquid separator, and under the joint action of the main impeller, the exhaust hole, the impeller cover, the impeller cover rear cavity, the auxiliary impeller, the suction and exhaust disc and the pump cover air cavity, the gas phase and part of the liquid phase mixture can be transported to the second gas-liquid separator. The structure is compact, flexible and convenient.

(3) The present application is provided with a second gas-liquid separator, through which the gas-liquid mixture input by the pump body can be separated for a second time, thereby improving the separation efficiency.

(4) The present application is provided with an overflow pipe, an overflow valve, a system outlet control valve, a pump outlet reflux pipeline and a reflux control valve. When the liquid levels of the first gas-liquid separator, the first gas-liquid separator and the second gas-liquid separator are in an abnormal state, dynamic adjustments can be made to reduce the probability of the system not being able to work normally due to changes in the liquid level.

(5) The present application is provided with a pressure monitoring alarm, which can monitor the internal pressure of the first gas-liquid separator and the second gas-liquid separator to improve the safety of the system.

(6) The present application is provided with a gas content monitoring device, which can monitor the gas content in the exhaust pipeline at the rear end of the pump, the discharge pipeline of the outlet gas-liquid separator, the return pipeline at the pump outlet and the overflow pipe, and can control the opening and closing of the valves corresponding to each of these pipelines, so that the overall system can be used as a liquid single-phase pumping system, thereby expanding the scope of application of the system.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic diagram of the overall structure of a separation type gas-liquid two-phase pumping system of the present invention;

FIG2 is a schematic diagram of the structure of the first gas-liquid separator and the components connected thereto;

Fig. 3 is a schematic diagram of the structure of the middle processing mechanism;

Figure 4 is a schematic diagram of the connection structure of the main impeller, the impeller cover and the auxiliary impeller;

FIG5 is a schematic diagram of a back-end processing mechanism.

Icons: 1-front-end processing mechanism; 11-first gas-liquid separator; 12-inlet flow pipeline; 121-system inlet control valve; 13-first overflow pipe; 14-first overflow valve; 15-first overflow sight glass; 2-middle processing mechanism; 21-pump body; 22-liquid phase discharge pipeline; 23-main impeller; 231-exhaust hole; 24-impeller cover; 25-secondary impeller; 26-suction and exhaust disc; 27-pump cover; 271-air cavity; 28-seal; 29-bearing housing; 210-pump shaft; 3-system outlet pipeline; 31-system outlet control valve; 4-rear-end processing mechanism; 41-second gas-liquid separator; 42-pump rear-end exhaust pipeline; 421-rear-end control valve; 43-outlet gas-liquid separator discharge pipeline; 431-outlet gas-liquid separation control valve; 44-second overflow pipe; 45-second overflow valve; 46-second overflow sight glass; 5-pressure monitoring alarm; 6-liquid level monitor; 7-pump outlet reflux pipeline; 71-reflux control valve; 8-gas content monitoring device; 9-gas outlet.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the present invention are for illustrative purposes only and do not represent the only implementation method.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

In the present invention, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Unless otherwise defined, all technical and scientific terms used in the specification of the present invention have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and/or" used in the specification of the present invention includes any and all combinations of one or more related listed items.

The embodiment of the present application provides a separation type gas-liquid two-phase pumping system, with reference to FIG1 , which shows the overall structural diagram of the separation type gas-liquid two-phase pumping system. The gas-liquid two-phase pumping system includes: a front-end processing mechanism 1, a middle processing mechanism 2 and a back-end processing mechanism 4; wherein the front-end processing mechanism 1 is provided with a first separation structure, and the gas-liquid two-phase medium entering the front-end processing mechanism 1 is preliminarily separated by the first separation structure. The middle processing mechanism 2, the middle processing mechanism 2 is connected to the front-end processing mechanism 1, and the middle processing mechanism 2 transports and separates the gas-liquid two-phase medium entering the middle processing mechanism 2 through the front-end processing mechanism 1; the middle processing mechanism 2 is connected to a system outlet pipeline 3, and the system outlet pipeline 3 is used to transport the liquid phase after being processed by the middle processing mechanism 2 to the target position. The back-end processing mechanism 4 has one end connected to the middle processing mechanism 2 and the other end connected to the system outlet pipeline 3; the back-end processing mechanism 4 is provided with a second separation structure, and the second separation structure re-separates the gas phase entering the back-end processing mechanism 4 from the middle processing mechanism 2; the treated liquid phase in the back-end processing mechanism 4 can be transported to the system outlet pipeline 3.

In the embodiment of the present application, the front-end processing mechanism 1 can be configured to include a first separation structure, and the gas-liquid two-phase medium will first enter the front-end processing mechanism 1, and the gas-liquid two-phase medium will be preliminarily separated by the first separation structure.

Exemplarily, the front-end processing mechanism 1 may be a gas-liquid separator or other device with a gas-liquid separation function, which separates the gas-liquid two-phase medium through a separation structure inside the device.

In the embodiment of the present application, the middle processing mechanism 2 can be connected to the front-end processing mechanism 1. After the gas-liquid two-phase medium is separated by the front-end processing mechanism 1, the gas-liquid mixture can enter the middle processing mechanism 2, and the middle processing mechanism 2 processes the gas-liquid mixture again. In addition, the position on the middle processing mechanism 2 corresponding to the front-end processing mechanism 1 is connected to the system outlet pipeline 3, and the liquid separated by the middle processing mechanism 2 is discharged from the system outlet pipeline 3.

Exemplarily, the middle processing mechanism 2 may be a centrifugal pump or other device capable of transporting liquid.

As another example, taking the case where the middle processing mechanism 2 is a centrifugal pump, the bottom of the middle processing mechanism 2 can be connected to the system outlet pipeline 3, and the liquid passing through the centrifugal pump can be transported from the system outlet pipeline 3 to a designated location.

In the embodiment of the present application, one end of the back-end processing mechanism 4 can be connected to the middle processing mechanism 2, and the other end can be connected to the system outlet pipeline 3. That is, the middle processing mechanism 2 is arranged between the front-end processing mechanism 1 and the back-end processing mechanism 4, and when the gas-liquid two-phase medium needs to be separated, the gas-liquid two-phase medium passes through the front-end processing mechanism 1, the middle processing mechanism 2 and the back-end processing mechanism 4 in sequence.

Among them, the back-end processing mechanism 4 can be provided with a second separation structure. The gas-liquid mixture separated by the middle processing mechanism 2 enters the back-end processing mechanism 4, and the second separation structure performs secondary gas-liquid separation on the gas-liquid mixture. The separated liquid is transported to the system outlet pipeline 3.

Exemplarily, the back-end processing mechanism 4 may also be a gas-liquid separator or other device capable of achieving gas-liquid separation. The structure of the back-end processing mechanism 4 may be the same as or different from that of the front-end processing mechanism 1, as long as it can achieve separation of gas-liquid two-phase media.

In the above embodiment, due to the provision of the front-end processing mechanism 1, the gas-liquid two-phase medium is initially separated before entering the middle processing mechanism 2, which greatly reduces the gas content in the middle processing mechanism 2; due to the provision of the middle processing mechanism 2, the gas-liquid two-phase medium is reprocessed by the middle processing mechanism 2; due to the provision of the back-end processing mechanism 4, the back-end processing mechanism 4 can perform secondary gas-liquid separation. In this way, most of the gas phase does not enter the middle processing mechanism 2, thereby realizing the transportation of the two-phase medium with large flow, high head and high gas content.

In some embodiments of the present application, referring to FIG. 2 , FIG. 2 shows a structural diagram of a front-end processing mechanism 1 . As shown in FIG. 1 and FIG. 2 , the front-end processing mechanism 1 includes a first gas-liquid separator 11 , and the first gas-liquid separator 11 is connected to an inlet flow pipeline 12 ; a first separation structure is arranged in the first gas-liquid separator 11 .

Exemplarily, the front-end processing mechanism 1 can be configured to have a structural form including a first gas-liquid separator 11, which is connected to an inlet flow pipeline 12; a first separation structure is arranged in the first gas-liquid separator 11, for example, a separation chamber, a gas exhaust port or other structures capable of achieving gas-liquid separation.

In another example, the first gas-liquid separator 11 is provided with a gas outlet 9 at the top and a liquid outlet at the bottom; the separated gas is discharged from the gas outlet 9, and the separated gas-liquid two-phase medium containing a small amount of gas phase enters the middle processing mechanism 2 from the bottom liquid outlet.

In the above embodiment, since the first gas-liquid separator 11 is provided, the gas-liquid two-phase medium is preliminarily separated by the first gas-liquid separator 11, and the gas-liquid two-phase separation is achieved before entering the middle processing mechanism 2, which greatly reduces the gas content in the middle processing mechanism 2, reduces the probability of the middle processing mechanism 2 being blocked, and improves work efficiency.

In some embodiments of the present application, referring to Figures 3 and 4, Figure 3 shows a structural diagram of the middle processing mechanism 2, and Figure 4 shows a connection structural diagram of the main impeller 23, the impeller cover 24, and the auxiliary impeller 25. The middle processing mechanism 2 includes a pump body 21, and a liquid phase discharge pipeline 22 is provided between the pump body 21 and the first gas-liquid separator 11, and one end of the liquid phase discharge pipeline 22 is connected to the first gas-liquid separator 11, and the other end is connected to the pump body 21.

Along the discharge direction of the gas in the pump body 21 , the pump body 21 is sequentially connected with a main impeller 23 , an impeller cover 24 , an auxiliary impeller 25 and a pump cover 27 ; the pump body 21 is provided with a pump shaft 210 , and the main impeller 23 and the auxiliary impeller 25 are both connected to the pump shaft 210 .

Among them, the position of the main impeller 23 on the pump body 21 is connected to the system outlet pipeline 3; the position of the main impeller 23 corresponding to the auxiliary impeller 25 is provided with an exhaust hole 231, and the position of the auxiliary impeller 25 corresponding to the impeller cover 24 is installed with an intake and exhaust disc 26, and the auxiliary impeller 25 is eccentrically arranged with the impeller cover 24; the position of the pump cover 27 corresponding to the main impeller 23 is provided with an air cavity 271, and the air cavity 271 is connected with the rear-end processing mechanism 4.

Exemplarily, the middle processing mechanism 2 can be configured to include a pump structure, for example, a vertical pump. Taking the middle processing mechanism 2 as a vertical pump as an example, a liquid phase discharge pipeline 22 is provided between the vertical pump and the first gas-liquid separator 11, and one end of the liquid phase discharge pipeline 22 is connected to the bottom end of the first gas-liquid separator 11, and the other end is connected to the bottom of the vertical pump. Due to the density difference between the gas phase and the liquid phase, it is beneficial for the gas phase to move upward, and because the inlet of the vertical pump is the lowest pressure point, the gas phase is easy to gather at this position.

In another example, in the vertical direction and in the direction from the bottom of the vertical pump to the top of the vertical pump, the pump body 21 of the vertical pump is sequentially connected with the main impeller 23, the impeller cover 24, the auxiliary impeller 25 and the pump cover 27. The pump body 21 is also rotatably connected with the pump shaft 210, the axis of the pump shaft 210 is arranged in the vertical direction, the main impeller 23 and the auxiliary impeller 25 are fixedly connected to the pump shaft 210, and the main impeller 23 and the auxiliary impeller 25 rotate coaxially.

It should be explained that the position of the main impeller 23 on the pump body 21 is connected to the system outlet pipeline 3, that is, the system outlet pipeline 3 is connected to the bottom of the pump body 21, and the liquid in the pump body 21 flows out through the system outlet pipeline 3. An exhaust hole 231 is provided at the root of the hub of the cover plate after the inlet of the main impeller 23, and the gas phase of the gas-liquid two-phase medium entering the pump body 21 from the first gas-liquid separator 11 can pass through the exhaust hole 231; and there is a gap between the impeller cover 24 and the main impeller 23, and the gas phase can pass through the exhaust hole 231 and the gap in turn to enter the auxiliary impeller 25.

Among them, the auxiliary impeller 25 can be installed in the rear cavity of the impeller cover 24, and the rear cavity of the impeller cover 24 can be set as an annular cavity. The axes of the auxiliary impeller 25 and the annular cavity do not overlap, that is, the auxiliary impeller 25 and the impeller cover 24 are eccentrically arranged. A suction and exhaust disc 26 is also arranged behind the auxiliary impeller 25. In this way, the liquid phase of the gas-liquid two-phase medium entering the pump body 21 is used as the working fluid. Through the combined action of the auxiliary impeller 25 and the suction and exhaust disc 26, it is equivalent to adding a liquid ring vacuum pump to the rear of the main impeller 23; thereby, the gas phase gathered at the inlet of the main impeller 23 is transported and guided to the air cavity 271 of the pump cover 27, and the air cavity 271 of the pump cover 27 is connected to the rear-end processing mechanism 4, and then the mixture with part of the liquid phase is transported to the rear-end processing mechanism 4.

It can be understood that a seal 28 is provided inside the pump body 21 and between corresponding parts to reduce the probability of the vertical pump failing to work or having low working efficiency due to poor sealing effect; a bearing housing 29 is provided on the pump body 21 at a position corresponding to the pump shaft 210 to assist the rotation of the pump shaft 210. The force generated by the pump shaft 210 during the rotation process can be transmitted to the bearing housing 29, thereby improving the stability of the vertical pump during operation.

In the above embodiment, since a pump body 21 is provided, support is provided for other components of the middle processing mechanism 2 through the provided pump body 21; since a main impeller 23, an exhaust hole 231, an impeller cover 24, an auxiliary impeller 25, an intake and exhaust disc 26 and a pump cover 27 are provided, the existing liquid phase can be used as a working fluid to guide the gas in the pump body 21 to the rear-end processing mechanism 4, the structure is compact, and the working efficiency is improved.

In some embodiments of the present application, referring to FIG. 5 , FIG. 5 shows a structural diagram of the back-end processing mechanism 4. The back-end processing mechanism 4 includes a second gas-liquid separator 41, and the second gas-liquid separator 41 is provided with a second separation structure. Among them, a pump rear-end exhaust pipeline 42 is provided between the second gas-liquid separator 41 and the air cavity 271, and one end of the pump rear-end exhaust pipeline 42 is connected to the air cavity 271, and the other end is connected to the second gas-liquid separator 41. An outlet gas-liquid separator drain pipeline 43 is provided between the second gas-liquid separator 41 and the system outlet pipeline 3, and one end of the outlet gas-liquid separator drain pipeline 43 is connected to the second gas-liquid separator 41, and the other end is connected to the system outlet pipeline 3.

Exemplarily, the back-end processing mechanism 4 may be configured to include a second gas-liquid separator 41, and the second gas-liquid separator 41 may be provided with a second separation structure, such as a screen, a gas outlet or other structures capable of performing gas-liquid separation.

In another example, a pump rear end exhaust pipeline 42 is arranged between the second gas-liquid separator 41 and the air cavity 271 on the pump cover 27, one end of the pump rear end exhaust pipeline 42 is connected to the air cavity 271 on the pump cover 27, and the other end is connected to the top of the second gas-liquid separator 41. The gas-liquid mixture in the pump body 21 can be transported to the second gas-liquid separator 41 through the pump rear end exhaust pipeline 42.

In another example, an outlet gas-liquid separator drain pipeline 43 is provided between the second gas-liquid separator 41 and the system outlet pipeline 3, one end of the outlet gas-liquid separator drain pipeline 43 is communicated with the bottom of the second gas-liquid separator 41, and the other end is communicated with the system outlet pipeline 3. The liquid separated by the second gas-liquid separator 41 can enter the system outlet pipeline 3 and be sent to the downstream together with the liquid flowing out of the vertical pump.

In the above embodiment, since a second gas-liquid separator 41 is provided, the gas-liquid mixture can be secondary separated by the second gas-liquid separator 41 to reduce the gas content in the liquid; since a pump rear end exhaust pipeline 42 is provided, the second gas-liquid separator 41 and the middle processing mechanism 2 can be connected by the pump rear end exhaust pipeline 42; since an outlet gas-liquid separator discharge pipeline 43 is provided, the liquid separated by the second gas-liquid separator 41 and the liquid processed by the middle processing mechanism 2 can be mixed and sent to the downstream together, which has a simple structure and is flexible and convenient.

In some embodiments of the present application, as shown in Figures 1, 2 and 5, the inlet flow pipeline 12 is provided with a system inlet control valve 121, the pump rear end exhaust pipeline 42 is provided with a rear end control valve 421, and the outlet gas-liquid separator discharge pipeline 43 is provided with an outlet gas-liquid separation control valve 431.

Exemplarily, a system inlet control valve 121 may be provided on the inlet flow pipeline 12 , and the flow rate of the medium entering the first gas-liquid separator 11 may be controlled by the valve.

As another example, a rear-end control valve 421 may be provided at the exhaust pipe 42 at the rear end of the pump to control the medium transport between the middle processing mechanism 2 and the rear-end processing mechanism 4 .

As another example, an outlet gas-liquid separation control valve 431 may be provided in the outlet gas-liquid separator discharge pipeline 43 to control the medium transportation between the back-end processing mechanism 4 and the system outlet pipeline 3 .

In the above embodiment, since the system inlet control valve 121, the rear end control valve 421 and the outlet gas-liquid separation control valve 431 are provided, the delivery conditions of the conveying medium in the corresponding pipelines can be controlled respectively to meet the usage requirements of different scenarios.

In some embodiments of the present application, as shown in FIG. 1 , FIG. 2 and FIG. 5 , the first gas-liquid separator 11 and the second gas-liquid separator 41 are both provided with a pressure monitoring alarm 5 .

Exemplarily, a pressure monitoring alarm 5 may be provided on the top of the first gas-liquid separator 11. When the internal pressure of the first gas-liquid separator 11 reaches a preset alarm pressure value, the pressure monitoring alarm 5 will automatically alarm.

As another example, a pressure monitoring alarm 5 may be provided on the top of the second gas-liquid separator 41. When the internal pressure of the second gas-liquid separator 41 reaches a preset alarm pressure value, the pressure monitoring alarm 5 will automatically alarm.

Among them, the tops of the first gas-liquid separator 11 and the second gas-liquid separator 41 are both provided with gas outlets 9 so that the separated gas can be discharged from the corresponding gas outlets 9. When the separated gas does not pollute the environment, it can be discharged directly, or the gas outlet 9 can be connected to a gas collection device, and the gas can be collected by the collection device and used as raw gas according to the requirements of the on-site construction process. When the separated gas is likely to pollute the environment, the gas treatment device can be connected to the gas outlet 9, the gas can be purified by the gas treatment device, and then the purified gas can be discharged or reused according to the construction requirements.

In the above embodiment, since a pressure monitoring alarm 5 is provided, the gas can be monitored by the pressure monitoring alarm 5, thereby reducing the probability of system pressure increase due to excessive accumulation of the gas phase, and realizing dynamic regulation of the system pressure through the pressure warning setting.

In some embodiments of the present application, as shown in FIG. 1 , FIG. 2 and FIG. 5 , the first gas-liquid separator 11 and the second gas-liquid separator 41 are both connected to an overflow pipe, and the overflow pipe is equipped with an overflow sight glass, and the overflow pipe is equipped with an overflow valve. The system outlet pipeline 3 is provided with a system outlet control valve 31. The first gas-liquid separator 11 and the second gas-liquid separator 41 are both provided with a liquid level monitor 6, and a pump outlet reflux pipeline 7 is provided between the first gas-liquid separator 11 and the system outlet pipeline 3, one end of the pump outlet reflux pipeline 7 is connected to the first gas-liquid separator 11, and the other end is connected to the system outlet pipeline 3, and the pump outlet reflux pipeline 7 is provided with a reflux control valve 71; the reflux control valve 71, the system outlet control valve 31, and the overflow valve are electrically connected to the liquid level monitor 6.

Exemplarily, a first overflow pipe 13 is connected to the bottom of the first gas-liquid separator 11 , a first overflow sight glass 15 is connected to the first overflow pipe 13 , and a first overflow valve 14 is installed on the first overflow pipe 13 .

In another example, the second gas-liquid separator 41 is connected to a second overflow pipe 44 at the bottom, the second overflow pipe 44 is connected to a second overflow sight glass 46 , and the second overflow pipe 44 is installed with a second overflow valve 45 .

It should be explained that the structures of the first overflow pipe 13 and the second overflow pipe 44 can be the same or different, as long as the overflow effect can be achieved. The present application uses the first overflow pipe 13 and the second overflow pipe 44 to be described separately for easy understanding.

In another example, the first gas-liquid separator 11 and the second gas-liquid separator 41 are both provided with a liquid level monitor 6. Taking the first gas-liquid separator 11 as an example, four liquid level markers can be provided inside the first gas-liquid separator 11, namely: low liquid level, normal liquid level, high liquid level and ultra-high liquid level. The liquid level in the first gas-liquid separator 11 is monitored by the liquid level monitor 6 in the first gas-liquid separator 11, and the second gas-liquid separator 41 is similar.

Among them, a pump outlet reflux pipeline 7 is arranged between the first gas-liquid separator 11 and the system outlet pipeline 3. One end of the pump outlet reflux pipeline 7 is connected to the first gas-liquid separator 11, and the other end is connected to the system outlet pipeline 3. The pump outlet reflux pipeline 7 can also be provided with a reflux control valve 71, and the delivery of liquid in the pump outlet reflux pipeline 7 is controlled by the reflux control valve 71.

In the above embodiment, since an overflow pipe, an overflow valve, a pump outlet return line 7, a system outlet control valve 31, a reflux control valve 71 and a liquid level monitor 6 are provided, the liquid level of the first gas-liquid separator 11 and/or the second gas-liquid separator 41 can be monitored by the liquid level monitor 6, so that the liquid level can be adjusted by the system outlet control valve 31 or the reflux control valve 71 or the overflow valve, thereby reducing the probability of the system not being able to work normally due to changes in the liquid level.

In some embodiments of the present application, as shown in Figure 1, the inlet flow pipeline 12 is provided with a gas content monitoring device 8, and the rear-end control valve 421, the outlet gas-liquid separation control valve 431, the reflux control valve 71, the system outlet control valve 31, and the overflow valve are all electrically connected to the gas content monitoring device 8.

Exemplarily, a gas content monitoring device 8 can be provided in the inlet flow pipeline 12, and the rear-end control valve 421, the outlet gas-liquid separation control valve 431, the reflux control valve 71, the system outlet control valve 31, and the overflow valve can be electrically connected to the gas content monitoring device 8 through wires, respectively. The gas content at the valve can be monitored by the gas content monitoring device 8, and the opening and closing of these valves can be controlled according to the monitoring results.

In the above embodiment, since a gas content monitoring device 8 is provided, the gas content monitoring device 8 can monitor the gas in the exhaust pipeline 42 at the rear end of the pump, the discharge pipeline 43 of the outlet gas-liquid separator, the return pipeline 7 at the pump outlet, and the overflow pipe. When there is no gas in the conveying medium and it is a liquid single phase, the conveying medium will not pass through these pipelines; it will only pass through the first gas-liquid separator 11 and the middle processing mechanism 2, and then flow out from the system outlet pipeline 3 for single-phase conveying. At this time, the first gas-liquid separator 11 can be used as a self-priming tank before the pump, so that the pumping system becomes a liquid single-phase pumping system with a self-priming function.

The following is an explanation of the use of a gas-liquid two-phase pumping system provided in the present application. When in use:

S100: First, the gas-liquid two-phase medium enters the first gas-liquid separator 11 through the inlet flow pipeline 12, and the first gas-liquid separator 11 separates the gas-liquid two-phase medium into gas and liquid. The separated gas is discharged from the gas outlet 9 at the top of the first gas-liquid separator 11, and the separated liquid and part of the gas mixture enter the pump body 21 through the liquid phase discharge pipeline 22.

S200: Secondly, after the liquid enters the pump body 21, part of the liquid phase is discharged through the system outlet pipeline 3, and the gas phase enters the auxiliary impeller 25 along with part of the liquid phase through the main impeller 23, the exhaust hole 231, and the gap between the impeller cover 24 and the main impeller 23 hub; the main impeller 23 and the auxiliary impeller 25 rotate coaxially, and the auxiliary impeller 25 and the impeller cover 24 are eccentrically installed. Since the rear cavity of the impeller cover 24 is an annular cavity, and an air intake and exhaust disc 26 is added behind the auxiliary impeller 25, the liquid phase in the pump body 21 is used as the working fluid, and the gas phase and part of the liquid phase gathered at the inlet of the main impeller 23 are transported to the second gas-liquid separator 41 through the exhaust pipeline 42 at the rear end of the pump through the combined action of the auxiliary impeller 25 and the air intake and exhaust disc 26.

S300: Finally, the second gas-liquid separator 41 performs secondary separation on the gas-liquid mixture delivered in, and the separated gas is discharged through the gas outlet 9 at the top, and the separated liquid is delivered to the system outlet pipeline 3 through the outlet gas-liquid separator discharge pipeline 43, and is delivered to the downstream together with the liquid in the pump body 21.

The separated gas-liquid two-phase pumping system proposed in this application may encounter some situations or other usage requirements during use, which are illustrated by examples:

S400: When the low liquid level warning alarm of the first gas-liquid separator 11 is sounded, the liquid level monitor 6 in the first gas-liquid separator 11 transmits a signal to the reflux control valve 71, and the reflux control valve 71 automatically opens, and the liquid in the pump outlet reflux pipeline 7 refluxes to the first gas-liquid separator 11 until the liquid level rises to the normal liquid level, and then the reflux control valve 71 automatically closes. When the separation type gas-liquid two-phase pumping system works normally, the reflux control valve 71 is in a normally closed state.

S500: When the high liquid level warning alarm of the first gas-liquid separator 11 is sounded, the liquid level monitor 6 in the first gas-liquid separator 11 transmits a signal to the system outlet control valve 31, increases the valve opening, and increases the pumping flow of the system outlet pipeline 3, until the liquid level drops to the normal level, and the system outlet control valve 31 is automatically adjusted to the original opening.

S600: When the first gas-liquid separator 11 and the second gas-liquid separator 41 give an early warning alarm of an over-high liquid level, the liquid level monitor 6 in the first gas-liquid separator 11 transmits a signal to the first overflow valve 14 in the first gas-liquid separator 11 to realize the automatic overflow of the first gas-liquid separator 11; the liquid level monitor 6 in the second gas-liquid separator 41 transmits a signal to the second overflow valve 45 in the second gas-liquid separator 41 to realize the automatic overflow of the second gas-liquid separator 41. And the signal can be transmitted to the system outlet control valve 31 to increase the valve opening, so that the pumping flow of the system outlet pipeline 3 is increased. After the liquid levels of the first gas-liquid separator 11 and the second gas-liquid separator 41 return to normal, the overflow valves in the first gas-liquid separator 11 and the second gas-liquid separator 41 are automatically closed, and the system outlet control valve 31 is automatically adjusted to the original opening.

S700: When there is no gas in the conveying medium, which is a liquid single-phase medium; the rear-end control valve 421, the outlet gas-liquid separation control valve 431, the reflux control valve 71, the system outlet control valve 31, the first overflow valve 14, the second overflow valve 45 and the gas content monitoring device 8 are interlocked to cut off the rear-end pipeline of the pump. The liquid single-phase medium enters the first gas-liquid separator 11 through the inlet flow pipeline 12. At this time, the first gas-liquid separator 11 can be used as a self-priming tank before the pump. The liquid phase in the first gas-liquid separator 11 enters the pump body 21 through the liquid phase discharge pipeline 22, and the liquid phase in the pump body 21 is discharged through the system outlet pipeline 3, so that the separation type gas-liquid two-phase pumping system becomes a liquid single-phase pumping system with self-priming function.

It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. A separation type gas-liquid two-phase pumping system, characterized by comprising: A front-end processing mechanism (1), wherein the front-end processing mechanism (1) is provided with a first separation structure, and the gas-liquid two-phase medium entering the front-end processing mechanism (1) is initially separated by the first separation structure; A middle processing mechanism (2), the middle processing mechanism (2) being connected to the front-end processing mechanism (1), the middle processing mechanism (2) processing the gas-liquid two-phase medium entering the middle processing mechanism (2) through the front-end processing mechanism (1); the middle processing mechanism (2) being connected to a system outlet pipeline (3) for transporting the liquid phase processed by the middle processing mechanism (2) to a target location; A rear-end processing mechanism (4), one end of the rear-end processing mechanism (4) is connected to the middle processing mechanism (2), and the other end is connected to the system outlet pipeline (3); The back-end processing mechanism (4) is provided with a second separation structure, and the second separation structure re-separates the gas phase entering the back-end processing mechanism (4) from the middle processing mechanism (2); the treated liquid phase in the back-end processing mechanism (4) can be transported to the system outlet pipeline (3). 2. The separation type gas-liquid two-phase pumping system according to claim 1 is characterized in that the front-end processing mechanism (1) comprises a first gas-liquid separator (11), the first gas-liquid separator (11) is connected to an inlet flow pipeline (12); and a first separation structure is arranged in the first gas-liquid separator (11). 3. The separation type gas-liquid two-phase pumping system according to claim 2, characterized in that the middle processing mechanism (2) comprises a pump body (21), a liquid phase discharge pipeline (22) is provided between the pump body (21) and the first gas-liquid separator (11), one end of the liquid phase discharge pipeline (22) is connected to the first gas-liquid separator (11), and the other end is connected to the pump body (21); Along the discharge direction of the gas in the pump body (21), the pump body (21) is sequentially connected with a main impeller (23), an impeller cover (24), an auxiliary impeller (25) and a pump cover (27); the pump body (21) is provided with a pump shaft (210), and the main impeller (23) and the auxiliary impeller (25) are both connected to the pump shaft (210); The position of the main impeller (23) on the pump body (21) is connected to a system outlet pipeline (3); an exhaust hole (231) is provided on the main impeller (23) at a position corresponding to the auxiliary impeller (25); an intake and exhaust disc (26) is installed on the auxiliary impeller (25) at a position corresponding to the impeller cover (24), and the auxiliary impeller (25) is eccentrically arranged with the impeller cover (24); an air cavity (271) is provided on the pump cover (27) at a position corresponding to the main impeller (23), and the air cavity (271) is connected to the rear-end processing mechanism (4). 4. The separation type gas-liquid two-phase pumping system according to claim 3, characterized in that the back-end processing mechanism (4) comprises a second gas-liquid separator (41), and the second gas-liquid separator (41) is provided with a second separation structure; Wherein, a pump rear end exhaust pipeline (42) is provided between the second gas-liquid separator (41) and the gas cavity (271); one end of the pump rear end exhaust pipeline (42) is in communication with the gas cavity (271), and the other end is in communication with the second gas-liquid separator (41); An outlet gas-liquid separator drain pipeline (43) is provided between the second gas-liquid separator (41) and the system outlet pipeline (3); one end of the outlet gas-liquid separator drain pipeline (43) is in communication with the second gas-liquid separator (41), and the other end is in communication with the system outlet pipeline (3). 5. The separation type gas-liquid two-phase pumping system according to claim 4 is characterized in that the inlet flow pipeline (12) is provided with a system inlet control valve (121), the pump rear end exhaust pipeline (42) is provided with a rear end control valve (421), and the outlet gas-liquid separator discharge pipeline (43) is provided with an outlet gas-liquid separation control valve (431). 6. The separation type gas-liquid two-phase pumping system according to claim 4, characterized in that the first gas-liquid separator (11) and the second gas-liquid separator (41) are both provided with a pressure monitoring alarm (5). 7. The separation type gas-liquid two-phase pumping system according to claim 5, characterized in that the first gas-liquid separator (11) and the second gas-liquid separator (41) are both connected to an overflow pipe, the overflow pipe is equipped with an overflow sight glass, and the overflow pipe is equipped with an overflow valve; The system outlet pipeline (3) is provided with a system outlet control valve (31); The first gas-liquid separator (11) and the second gas-liquid separator (41) are both provided with a liquid level monitor (6); a pump outlet return pipeline (7) is provided between the first gas-liquid separator (11) and the system outlet pipeline (3); one end of the pump outlet return pipeline (7) is in communication with the first gas-liquid separator (11), and the other end is in communication with the system outlet pipeline (3); the pump outlet return pipeline (7) is provided with a return control valve (71); the return control valve (71), the system outlet control valve (31), and the overflow valve are electrically connected to the liquid level monitor (6). 8. The separation type gas-liquid two-phase pumping system according to claim 7 is characterized in that the inlet flow pipeline (12) is provided with a gas content monitoring device (8), and the rear-end control valve (421), the outlet gas-liquid separation control valve (431), the reflux control valve (71), the system outlet control valve (31), and the overflow valve are all electrically connected to the gas content monitoring device (8).