Gas-liquid separation type impeller and gas-liquid separation pump

Abstract

The utility model discloses a gas-liquid separation type impeller and a gas-liquid separation pump, and relates to the technical field of gas-liquid separation pumps. The multi-stage exhaust mechanism comprises a first-stage exhaust hole set and a second-stage exhaust hole set, the first-stage exhaust hole set is arranged at an inlet hub of the gas-liquid separation type impeller, and the second-stage exhaust hole set is arranged on a rear cover plate of the gas-liquid separation type impeller and located on the back face of the inlet side of the main blade; the gas-liquid separation mechanism is arranged on the side, away from the main blade, of the rear cover plate, a separation flow channel is formed in the gas-liquid separation mechanism, and gas-liquid mixtures discharged by the first-stage exhaust hole set and the second-stage exhaust hole set communicate with the separation flow channel; and the gas-liquid separation mechanism comprises one or more groups of separation blades which radially extend on the surface of the rear cover plate. Through the targeted design of the multi-stage exhaust mechanism and the enhanced separation effect of the gas-liquid separation mechanism, directional collection and deep separation of gases from different sources are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas-liquid separation pumps, and particularly relates to a gas-liquid separation type impeller and a gas-liquid separation pump. BACKGROUND

[0002] In the industrial fields of chemical industry, environmental protection and energy, liquid media containing dissolved gas or free gas need to be treated in the process. Accumulation of gas in the pump will cause cavitation, flow head drop, efficiency reduction, vibration and noise increase and other problems, which seriously affect the stability and reliability of pump operation, and even cause equipment damage.

[0003] In the prior art, a gas-liquid separation pump with a vertical structure is a commonly used device to solve the above problems. It usually uses the principle of combining vacuum negative pressure and high-speed centrifugal force to realize gas-liquid separation, and its working principle is as follows: the gas-liquid containing liquid enters from the bottom of the pump, the impeller rotates at high speed to form negative pressure in the inlet area, so as to promote the dissolved gas to be precipitated; then, in the strong centrifugal field, the gas with smaller density gathers to the center area of the impeller and is discharged through a specific channel, while the liquid with larger density is thrown to the outside of the impeller and is output through the flow channel of the pump body, so as to realize the stratification and separation of gas and liquid.

[0004] However, the existing gas-liquid separation pump impeller still has some deficiencies. First, the gas is precipitated and gathered at different positions in the impeller (such as the inlet hub area and the blade back cavitation area), and if the exhaust channel is designed to be single, it is difficult to efficiently and specifically collect and discharge the gas from different sources. Secondly, in the process of discharging gas, part of the liquid will inevitably enter the exhaust channel with the gas, and if the subsequent secondary separation effect is not good, it will cause "liquid in gas" or poor exhaust, affecting the separation efficiency and system stability. CONTENT OF THE INVENTION

[0005] The embodiment of the present application provides a gas-liquid separation type impeller and a gas-liquid separation pump, which solves the problems in the background art.

[0006] In a first aspect, the embodiments of the present application provide a gas-liquid separation type impeller, comprising: a multi-stage exhaust mechanism, comprising a first-stage exhaust hole group and a second-stage exhaust hole group, the first-stage exhaust hole group is arranged at an inlet hub of the gas-liquid separation type impeller, and the second-stage exhaust hole group is arranged on a back cover plate of the gas-liquid separation type impeller and located at a back of an inlet edge of a main blade; the multi-stage exhaust mechanism is used for separating and collecting gas from different areas in the gas-liquid separation type impeller respectively; a gas-liquid separation mechanism is arranged on a side of the back cover plate away from the main blade, a separation flow channel is formed in the gas-liquid separation mechanism, and gas-liquid mixtures discharged by the first-stage exhaust hole group and the second-stage exhaust hole group are communicated with the separation flow channel; wherein the gas-liquid separation mechanism comprises one or more groups of separation blades extending radially on a surface of the back cover plate, used for forming a centrifugal field when the gas-liquid separation type impeller rotates, and performing secondary separation on the gas-liquid mixtures flowing into the separation flow channel.

[0007] In combination with the first aspect, in a possible implementation manner, an axial height of the separation blade is greater than an axial height of the main blade flow channel at a radial position where the separation blade is located.

[0008] In combination with the first aspect, in a possible implementation manner, the separation blade comprises long back blades and short back blades; the long back blades and the short back blades are arranged staggeredly along a circumferential direction of the back cover plate.

[0009] In combination with the first aspect, in a possible implementation manner, the short back blades and the second-stage exhaust hole group are staggered in a radial direction and a circumferential direction of the back cover plate.

[0010] In a second aspect, the embodiments of the present application provide a gas-liquid separation pump, comprising the gas-liquid separation type impeller in the first aspect or any possible implementation manner of the first aspect, a pump body, a rotating shaft, a bearing box and a balance cavity; a suction chamber is arranged at a bottom of the pump body, and a discharge chamber is arranged at a side of the pump body; the pump body is detachably connected to the bearing box; the rotating shaft is rotatably supported in the bearing box and extends into the pump body; the gas-liquid separation type impeller is mounted at an end of an end portion of the rotating shaft extending into the pump body, and main blades of the gas-liquid separation type impeller are close to the suction chamber; an inner wall of the pump body and the rotating shaft enclose a gas collection cavity on a side of a back cover plate of the gas-liquid separation type impeller away from the main blades; the gas collection cavity is in fluid communication with a separation flow channel of a gas-liquid separation mechanism of the gas-liquid separation type impeller, and is used for collecting gas-phase medium discharged by the separation flow channel; the balance cavity is in an annular structure surrounding the rotating shaft, is arranged on a side of the gas collection cavity away from the gas-liquid separation type impeller in an axial direction, and is in fluid communication with the gas collection cavity; wherein a balance interface is arranged on a side wall of the balance cavity, and is used for fluid communication between the balance cavity and an external gas-phase space.

[0011] With reference to the second aspect, in a possible implementation manner, the external gas phase space is an inlet tank gas phase space of the gas-liquid separation pump.

[0012] With reference to the second aspect, in a possible implementation manner, the gas-liquid separation pump further comprises an exhaust cavity. The gas collection cavity is in fluid communication with the balance cavity through the exhaust cavity; and a flow passage cross-sectional area of the exhaust cavity is smaller than a flow passage cross-sectional area of the gas collection cavity.

[0013] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects:

[0014] The gas-liquid separation type impeller provided in the present application comprises a multi-stage exhaust mechanism and a gas-liquid separation mechanism. When the gas-liquid separation type impeller rotates at a high speed, a low pressure area is formed at a separation blade root area of the gas-liquid separation mechanism, and this pressure difference promotes the separated gas in the gas-liquid separation type impeller to flow into a separation flow passage through the first-stage exhaust hole group and the second-stage exhaust hole group of the multi-stage exhaust mechanism. In this process, the first-stage exhaust hole group mainly separates and collects the gas gathered in the low pressure area at the inlet of the gas-liquid separation type impeller, and the second-stage exhaust hole group is specially used to collect the gas generated by cavitation at the inlet of the main blade. At the same time, part of the liquid phase medium will enter the separation flow passage together with the gas phase medium, and under the action of the strong centrifugal field generated by the separation blade, efficient separation of the gas-liquid two-phase is realized, and a stable gas-liquid separation interface is formed in the separation flow passage. Therefore, through the targeted design of the multi-stage exhaust mechanism and the reinforced separation effect of the gas-liquid separation mechanism, the present application effectively overcomes the problems of single exhaust passage design and poor secondary separation effect in the background art, realizes directional collection and deep separation of gas from different sources, and guarantees the stable operation of the pump system. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0016] Figure 1 A structural schematic diagram of the gas-liquid separation type impeller provided in the embodiments of the present application is shown in FIG. 1.

[0017] Figure 2 A structural schematic diagram of the gas-liquid separation mechanism provided in the embodiments of the present application is shown in FIG. 2.

[0018] Figure 3 A structural schematic diagram of the gas-liquid separation pump provided in the embodiments of the present application is shown in FIG. 3.

[0019] Figure 4 A structural schematic diagram of the gas-liquid separation pump provided in the embodiments of the present application is shown in FIG. 3. Figure 3A local enlarged view of A in FIG. 1.

[0020] Icon: 1-gas-liquid separation type impeller; 11-hub; 12-multistage exhaust mechanism; 121-first stage exhaust hole group; 122-second stage exhaust hole group; 13-gas-liquid separation mechanism; 131-separation blade; 1311-long back blade; 1312-short back blade; 1313-isolation area; 14-back cover plate; 15-main blade; 2-exhaust cavity; 3-pump body; 31-suction chamber; 32-discharge chamber; 4-rotation shaft; 5-bearing box; 6-balance cavity; 7-gas collection cavity; 8-balance interface. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0022] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the communication between two elements inside. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0023] The embodiments of the present application provide a gas-liquid separation type impeller, as shown in Figures 1 to 4The gas-liquid separation impeller 1 includes a multi-stage exhaust mechanism 12 and a gas-liquid separation mechanism 13. The multi-stage exhaust mechanism 12 includes a first-stage exhaust hole group 121 and a second-stage exhaust hole group 122. The first-stage exhaust hole group 121 is arranged at the inlet hub 11 of the gas-liquid separation impeller 1, and the second-stage exhaust hole group 122 is arranged on the back cover plate 14 of the gas-liquid separation impeller 1 and located at the back of the inlet edge of the main blade 15. The multi-stage exhaust mechanism 12 is used to separate and collect gas from different areas in the gas-liquid separation impeller 1. The gas-liquid separation mechanism 13 is arranged on the side of the back cover plate 14 away from the main blade 15. The gas-liquid separation mechanism 13 has a separation flow channel formed inside. The gas-liquid mixture discharged by the first-stage exhaust hole group 121 and the second-stage exhaust hole group 122 communicates with the separation flow channel. The gas-liquid separation mechanism 13 includes one or more groups of separation blades 131 extending radially on the surface of the back cover plate 14. The separation blades 131 form a centrifugal field during the rotation of the gas-liquid separation impeller 1 and perform secondary separation on the gas-liquid mixture flowing into the separation flow channel.

[0024] It should be noted that when the gas-liquid separation impeller 1 rotates at high speed, a low-pressure area is formed at the root area of the separation blade 131 of the gas-liquid separation mechanism 13. This pressure difference causes the separated gas in the gas-liquid separation impeller 1 to flow into the separation flow channel through the first-stage exhaust hole group 121 and the second-stage exhaust hole group 122 of the multi-stage exhaust mechanism 12. In this process, the first-stage exhaust hole group 121 mainly separates and collects the gas accumulated in the low-pressure area at the inlet of the gas-liquid separation impeller 1, and the second-stage exhaust hole group 122 is specifically used to collect the gas generated by cavitation at the inlet of the main blade 15. At the same time, part of the liquid medium will enter the separation flow channel with the gas medium. Under the action of the strong centrifugal field generated by the separation blade 131, efficient separation of the gas-liquid two-phase is realized, and a stable gas-liquid separation interface is formed in the separation flow channel. Therefore, through the targeted design of the multi-stage exhaust mechanism 12 and the enhanced separation effect of the gas-liquid separation mechanism 13, the problems of single exhaust channel design and poor secondary separation effect in the background art are effectively overcome. The directional collection and deep separation of gas from different sources are realized, the gas-liquid separation efficiency is improved, and the stable operation of the pump system is ensured.

[0025] In the embodiment of the present application, the axial height of the separation blade 131 is greater than the axial height of the main blade 15 flow channel at the radial position where the separation blade 131 is located, thereby increasing the radial size and centrifugal action area of the separation flow channel. This "tall" design enhances the work capacity of the separation blade 131 on the gas-liquid mixture, so that the gas medium obtains more sufficient centrifugal separation time in the increased flow channel space, and the liquid medium is more effectively thrown to the outside under the action of a stronger centrifugal force, thereby improving the gas-liquid separation efficiency and separation completeness.

[0026] In the embodiments of the present application, the separation blades 131 include long back blades 1311 and short back blades 1312. The long back blades 1311 and the short back blades 1312 are arranged alternately along the circumferential direction of the back cover plate 14.

[0027] As shown in FIG. 1, two adjacent long back blades 1311 are provided with a short back blade 1312 therebetween, forming a plurality of independent isolation areas 1313 in the separation flow channel. This arrangement effectively prevents the mutual interference of the gas-phase medium in different flow channel areas, preventing the backflow and turbulence of the gas. The independent isolation area 1313 formed between the two long back blades 1311 by the short back blade 1312 provides a stable collection space for the gas-phase medium, so that the separated gas can be orderly discharged along the preset flow path, improving the smoothness of the exhaust. Figure 2

[0028] In the embodiments of the present application, the short back blades 1312 and the second-stage exhaust hole group 122 are staggered in the radial direction and the circumferential direction of the back cover plate 14, realizing the optimized cooperation of the exhaust passage and the separation flow channel. The spatial positional relationship of this design ensures that the gas-liquid mixture discharged from the second-stage exhaust hole group 122 can be smoothly introduced into the separation flow channel, while avoiding the flow interference of the short back blades 1312 on the second-stage exhaust hole group 122.

[0029] The embodiments of the present application provide a gas-liquid separation pump, which comprises the above-mentioned gas-liquid separation type impeller 1, a pump body 3, a rotating shaft 4, a bearing box 5 and a balance cavity 6. The bottom of the pump body 3 is provided with a suction chamber 31, and the side is provided with a discharge chamber 32. The pump body 3 is detachably connected to the bearing box 5. The rotating shaft 4 is rotatably supported in the bearing box 5 and extends into the pump body 3. The gas-liquid separation type impeller 1 is installed on the end of the end of the rotating shaft 4 extending into the pump body 3, and the main blades 15 thereof are close to the suction chamber 31. At the same time, on the side of the back cover plate 14 of the gas-liquid separation type impeller 1 facing away from the main blades 15, the inner wall of the pump body 3 and the rotating shaft 4 form a gas collection cavity 7. The gas collection cavity 7 is in fluid communication with the separation flow channel of the gas-liquid separation mechanism 13 of the gas-liquid separation type impeller 1, for collecting the gas-phase medium discharged from the separation flow channel. The balance cavity 6 is an annular structure surrounding the rotating shaft 4, which is arranged on the side of the gas collection cavity 7 away from the gas-liquid separation type impeller 1 in the axial direction and is in fluid communication with the gas collection cavity 7. The side wall of the balance cavity 6 is provided with a balance interface 8 for fluid communication between the balance cavity 6 and the external gas-phase space.

[0030] ​It should be noted that when the gas-liquid separation impeller 1 rotates at high speed, under the action of centrifugal force, the separated gas converges to the low pressure area at the center of the gas-liquid separation impeller 1, and enters the separation flow channel through the second-stage gas discharge hole group 122, and is finally discharged into the gas collection chamber 7. At the same time, the liquid phase medium is thrown to the outside and is output through the pressing chamber 32 of the pump body 3, realizing efficient separation of the gas-liquid two-phase. In order to further optimize the system performance, the application sets a balance cavity 6 in fluid communication with the gas collection chamber 7, and the balance cavity 6 is in communication with the external gas phase space through the balance interface 8 on the side wall, thereby constructing a stable pressure balance system. Therefore, through the pressure balance system constructed by the balance cavity 6 and the balance interface 8, the pressure balance between the gas collection chamber 7 and the external gas phase space can be effectively maintained, which not only ensures the smooth discharge of the separated gas phase medium, but also prevents the high-pressure liquid from flowing into the sealing area.

[0031] In the embodiment of the application, the external gas phase space is the inlet tank gas phase space of the gas-liquid separation pump.

[0032] In the embodiment of the application, the gas-liquid separation pump further comprises an exhaust cavity 2. The gas collection chamber 7 is in fluid communication with the balance cavity 6 through the exhaust cavity 2, and the flow passage cross-sectional area of the exhaust cavity 2 is smaller than that of the gas collection chamber 7, forming a specific throttling effect on the gas flow path. This tapered flow passage design effectively accelerates the flow speed of the gas phase medium, prevents the gas from stagnating and accumulating in the cavity, and at the same time promotes the further separation of the gas-liquid two-phase. This structure optimizes the exhaust dynamics, ensuring that the separated gas can be quickly and continuously discharged from the system.

[0033] The various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0034] The above embodiments are only used to illustrate the technical solutions of the application, and are not limited to the application; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the application.

Claims

1. A gas-liquid separation type impeller characterized by, include: The multi-stage exhaust mechanism (12) includes a first-stage exhaust port group (121) and a second-stage exhaust port group (122). The first-stage exhaust port group (121) is located at the inlet hub (11) of the gas-liquid separation impeller (1), and the second-stage exhaust port group (122) is located on the rear cover plate (14) of the gas-liquid separation impeller (1) and on the back side of the inlet edge of the main blade (15). The multi-stage exhaust mechanism (12) is used to separate and collect gas from different areas within the gas-liquid separation impeller (1). A gas-liquid separation mechanism (13) is disposed on the side of the rear cover plate (14) away from the main blade (15). A separation flow channel is formed inside the gas-liquid separation mechanism (13). The gas-liquid mixture discharged from the first-stage exhaust hole group (121) and the second-stage exhaust hole group (122) are both connected to the separation flow channel. The gas-liquid separation mechanism (13) includes one or more sets of separation blades (131) that extend radially to the surface of the rear cover plate (14) to form a centrifugal force field when the gas-liquid separation impeller (1) rotates, and to perform secondary separation of the gas-liquid mixture flowing into the separation channel.

2. The gas-liquid separation type impeller according to claim 1, characterized by The axial height of the separating blade (131) is greater than the axial height of the flow channel of the main blade (15) at its radial position.

3. The gas-liquid separation type impeller according to claim 1, characterized by The separated blade (131) includes a long back blade (1311) and a short back blade (1312). The long back blade (1311) and the short back blade (1312) are arranged alternately along the circumferential direction of the rear cover plate (14).

4. The gas-liquid separation type impeller according to claim 3, characterized by The short back blade (1312) and the second-stage exhaust port group (122) are offset from each other in both the radial and circumferential directions of the rear cover plate (14).

5. A gas-liquid separation pump characterized by, The impeller (1), pump body (3), rotating shaft (4), bearing housing (5), and balancing chamber (6) of any one of claims 1-4 are gas-liquid separation types. The bottom of the pump body (3) is provided with a suction chamber (31) and the side is provided with a discharge chamber (32). The pump body (3) is detachably connected to the bearing housing (5); The rotating shaft (4) is rotatably supported in the bearing housing (5) and extends into the pump body (3). The gas-liquid separation impeller (1) is installed at the end of the rotating shaft (4) that extends into the pump body (3), and its main blade (15) is close to the suction chamber (31); on the side of the rear cover plate (14) of the gas-liquid separation impeller (1) facing away from the main blade (15), the inner wall of the pump body (3) and the rotating shaft (4) enclose to form a gas collection chamber (7). The gas collection chamber (7) is in fluid communication with the separation channel of the gas-liquid separation mechanism (13) of the gas-liquid separation impeller (1), and is used to collect the gaseous medium discharged from the separation channel; The balancing chamber (6) is an annular structure surrounding the rotating shaft (4), which is arranged axially on the side of the gas collection chamber (7) away from the gas-liquid separation impeller (1) and is in fluid communication with the gas collection chamber (7). The side wall of the balance cavity (6) is provided with a balance interface (8) for fluid communication between the balance cavity (6) and an external gas phase space.

6. The gas-liquid separation pump of claim 5, wherein, The external gas phase space is a gas phase space of an inlet tank of a gas-liquid separation pump.

7. The gas-liquid separation pump of claim 5, wherein, Further comprising an exhaust cavity (2); The gas collection cavity (7) is in fluid communication with the balance cavity (6) through the exhaust cavity (2); The flow passage cross-sectional area of the exhaust cavity (2) is smaller than the flow passage cross-sectional area of the gas collection cavity (7).

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