Mixed transportation rotor pump for conveying fluid with high gas-liquid ratio

Abstract

The invention relates to the technical field of oil field gathering and multiphase mixed transportation, in particular to a mixed transportation rotor pump for high-gas-liquid-ratio fluid transportation, which comprises a main rotor, an auxiliary rotor, a first end cover, a second end cover and a pump body, the clearance sealing structure needs to achieve meshing clearance sealing, intra-cavity clearance sealing and end face clearance sealing at the same time, the meshing clearance is formed by the meshing surfaces of the main rotor and the auxiliary rotor, and the intra-cavity clearance is formed by the clearance between the pump cavity and the main rotor and the clearance between the pump cavity and the auxiliary rotor; the end face gap is composed of a gap between the end face of the main rotor and the first end cover and the second end cover and a gap between the end face of the auxiliary rotor and the first end cover and the second end cover. Gas dredging and plug removal under the high gas-liquid ratio condition of an oil field can be achieved through the multiphase pump, an independent additional liquid supplementing skid-mounted device or manual gas exhausting or manual liquid adding or the like is not needed any more, and the conveying efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield gathering and transportation multiphase mixed transportation, in particular to a mixed transportation rotor pump for transporting high gas-liquid ratio fluid. Background Art

[0002] In the modern petroleum industry, traditional distribution and transportation is to separate gas, liquid and solid, and then use pumps and compressors to pressurize and transmit liquid and gas respectively. However, this separation and transportation method is not only cumbersome, but also time-consuming and expensive. It also requires specialized personnel to monitor and operate, which increases labor costs. Multiphase mixed transportation technology is a new technology that mixes and pressurizes oil well output and directly transports it to the joint station. It can simplify the production process, reduce engineering investment and wellhead back pressure, and increase production and benefits. Especially in small and medium-sized oil fields such as beach oil fields, marginal oil fields, desert oil fields, satellite oil fields, etc. with limited geographical environment, it shows technical and economic advantages that conventional distribution and transportation cannot match, and has become the most powerful choice to improve the economic benefits of oil field development.

[0003] As the core power equipment of multiphase mixed transportation technology, the mixed flow pump is the key to achieve mixed transportation. However, when the inlet of the mixed flow pump is a pure gas slug flow or a very small amount of liquid (i.e., a high gas-liquid ratio), there is a gap between the rotor and the pump body. When a slug flow occurs and there is no liquid for liquid sealing, the high-pressure chamber and the low-pressure chamber will be connected, and the sealing effect cannot be achieved, resulting in the "gas blockage" phenomenon. Gas blockage at the pump inlet will cause the pressure to continue to rise, increase safety hazards, reduce the efficiency of the pump, shorten the life of the pump, and in severe cases, cause problems such as medium mixed transportation failure. Slug flow, as a common flow pattern in mixed transportation, will deteriorate the operating conditions of the pipeline and cause unstable vibration in the pipeline. It is the most harmful flow pattern in the mixed transportation process and one of the key difficulties affecting the development of smart oil fields. However, at present, the problem of gas blockage is mainly solved by a separate fluid replenishment device, manual exhaust and artificial additional fluid replenishment. Using a fluid replenishment device to remove blockage increases costs, energy consumption and the difficulty of intelligent control; manual exhaust to remove blockage increases the gas processing link and may also pollute the environment; manual additional fluid replenishment to remove blockage increases the labor intensity of staff, the equipment is large in size, the installation process is cumbersome, the control operation is not convenient enough, and it is not conducive to the construction and development of smart oil fields. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a mixed rotor pump for conveying fluids with a high gas-liquid ratio, so as to at least solve the problem of slug gas blockage that is prone to occur during the fully enclosed continuous multiphase mixed conveying of oil, gas and sand in existing oil well sites.

[0005] The present invention solves the above technical problems by the following technical means:

[0006] The embodiment of the present invention provides a mixed-transfer rotor pump for transporting fluids with a high gas-liquid ratio, comprising:

[0007] Main rotor;

[0008] an auxiliary rotor meshing with the main rotor;

[0009] End caps, including a first end cap and a second end cap;

[0010] A pump body, located between the first end cover and the second end cover, the pump body having a pump cavity, the main rotor and the auxiliary rotor both being located in the pump cavity;

[0011] A gap sealing structure, comprising at least one of a first gap sealing assembly, a second gap sealing assembly, a third gap sealing assembly, a fourth gap sealing assembly, a fifth gap sealing assembly, a sixth gap sealing assembly, and a seventh gap sealing assembly, wherein the gap sealing structure needs to simultaneously realize meshing gap sealing, intra-cavity gap sealing, and end face gap sealing, wherein the meshing gap is formed by the meshing surfaces of the main rotor and the auxiliary rotor, the intra-cavity gap is formed by the gaps between the pump cavity and the main rotor, and between the pump cavity and the auxiliary rotor, and the end face gap is formed by the gaps between the end face of the main rotor and the first end cover and the second end cover, and the gaps between the end face of the auxiliary rotor and the first end cover and the second end cover.

[0012] In some embodiments, a plurality of first gap sealing assemblies are installed on both the main rotor and the auxiliary rotor, and the first gap sealing assemblies include:

[0013] A first elastic block is mounted on the meshing surface of the main rotor and the auxiliary rotor, and opposite ends of the first elastic block each have a first positioning space;

[0014] A first positioning block, wherein there are two first positioning blocks, the two first positioning blocks are respectively mounted on two opposite end surfaces of the main rotor and the auxiliary rotor, and the two first positioning blocks are respectively located in two first positioning spaces;

[0015] The first leaf spring is mounted on the first elastic block and is located between the two first positioning blocks. The first leaf spring is embedded in the main rotor and the auxiliary rotor.

[0016] In some embodiments, the first elastic block includes a first arc-shaped elastic plate and a first square elastic plate that are fixedly connected, the length of the first arc-shaped elastic plate is equal to the thickness of the main rotor, and the first leaf spring is installed on the first square elastic plate;

[0017] The meshing surfaces of the main rotor and the auxiliary rotor both have a first rotor groove, which runs through the two end surfaces of the main rotor and the auxiliary rotor. The first rotor groove includes a first placement groove and first positioning grooves located at both ends of the first placement groove. The first positioning block is embedded in the first positioning groove, and the first leaf spring and the first elastic block are both located in the first placement groove.

[0018] In some embodiments, a plurality of second gap sealing assemblies are installed on both the main rotor and the auxiliary rotor, and the second gap sealing assemblies include:

[0019] A second elastic block is installed on two end surfaces of the main rotor and the auxiliary rotor, the second elastic block is installed along the radial direction of the main rotor and the auxiliary rotor, and one end of the second elastic block has a second positioning space;

[0020] A second positioning block is installed on the meshing surface of the main rotor and the auxiliary rotor, and the second positioning block is located in the second positioning space;

[0021] The second leaf spring is mounted on the second elastic block, and the second leaf spring is embedded in the main rotor and the auxiliary rotor.

[0022] In some embodiments, the second elastic block includes a second arc-shaped elastic plate and a second square elastic plate fixedly connected, and the second leaf spring is installed on the second square elastic plate; the end faces of the main rotor and the auxiliary rotor both have second rotor grooves, and the second rotor grooves include a second positioning groove and a second placement groove, the second placement grooves are radially arranged along the main rotor and the auxiliary rotor, and the second placement grooves pass through the meshing surface, the second leaf spring and the second elastic block are both located in the second placement groove, and the second positioning block is located in the second positioning groove.

[0023] In some embodiments, a third gap sealing assembly is installed on the main rotor and the auxiliary rotor and / or the inner wall of the pump chamber, and only the third gap sealing assembly installed on the main rotor and the auxiliary rotor forms an engaging gap seal, and the third gap sealing assembly installed on the inner wall of the pump chamber, the main rotor and the auxiliary rotor forms an engaging gap seal and an intra-cavity gap seal; the third gap sealing assembly includes:

[0024] A first spring is embedded in the main rotor and the auxiliary rotor, and / or embedded in the inner wall of the pump chamber;

[0025] The third elastic block is connected to the first spring and is installed on the meshing surfaces of the main rotor and the auxiliary rotor and / or on the inner wall surface of the pump chamber.

[0026] In some embodiments, a fourth gap sealing assembly is installed on the main rotor and the auxiliary rotor and / or the inner wall of the pump chamber, and only the fourth gap sealing assembly installed on the main rotor and the auxiliary rotor forms an engaging gap seal, and the fourth gap sealing assembly installed on the inner wall of the pump chamber, the main rotor and the auxiliary rotor forms an engaging gap seal and an intra-cavity gap seal; the fourth gap sealing assembly includes a first buffer ring wrapped around the main rotor and the auxiliary rotor, and / or a second buffer ring attached to the inner wall of the pump chamber.

[0027] In some embodiments, the main rotor and the auxiliary rotor are both provided with fifth gap sealing assemblies at opposite ends thereof, and the two fifth gap sealing assemblies are respectively attached to the first end cover and the second end cover, and the fifth gap sealing assemblies include:

[0028] A side plate mounted on the first end cover and the second end cover;

[0029] The third leaf spring is installed at the opposite ends of the side plate, and the two third leaf springs correspond to the main rotor and the auxiliary rotor respectively. The positions corresponding to the third leaf springs on the first end cover and the second end cover are both provided with end cover grooves, and the third leaf spring is embedded in the end cover grooves.

[0030] In some embodiments, the main rotor and the auxiliary rotor are both provided with sixth gap sealing assemblies at opposite ends, and the two sixth gap sealing assemblies are respectively attached to the first end cover and the second end cover, and the sixth gap sealing assembly includes:

[0031] A side plate mounted on the first end cover and the second end cover;

[0032] A buffer assembly is mounted on the side plate, the buffer assembly comprises a second spring and a fourth elastic block connected to the second spring, the second spring is embedded in the side plate, and the fourth elastic block is mounted on the end surface of the side plate facing the main rotor and the auxiliary rotor;

[0033] Alternatively, the sixth gap sealing component is a buffer pad made of elastic material.

[0034] In some embodiments, the main rotor and the auxiliary rotor are both provided with seventh gap sealing assemblies at opposite ends thereof, and the two seventh gap sealing assemblies are respectively correspondingly attached to the first end cover and the second end cover, and the seventh gap sealing assembly comprises:

[0035] A side plate mounted on the first end cover and the second end cover;

[0036] A liquid channel is arranged at one end of the side plate facing the main rotor and the auxiliary rotor. The liquid channel is filled with liquid. The liquid channel includes an arc channel and a horizontal channel. The arc channel and the horizontal channel are designed around the main rotor and the auxiliary rotor.

[0037] The mixed rotor pump for conveying fluids with a high gas-liquid ratio of the present invention adopts a gap sealing structure including at least one of a first gap sealing component, a second gap sealing component, a third gap sealing component, a fourth gap sealing component, a fifth gap sealing component, a sixth gap sealing component, and a seventh gap sealing component. A variety of variable and detachable gap sealing structures are used. According to actual on-site needs, when the mixed pump being used conveys media with different gas-liquid ratios and gas blockage occurs, the first gap sealing component, the second gap sealing component, the third gap sealing component, the fourth gap sealing component, the fifth gap sealing component, the sixth gap sealing component, and the seventh gap sealing component can be freely combined to achieve sealing of the meshing gap, the cavity gap, and the end face gap, thereby eliminating gas blockage.

[0038] The mixed-flow rotor pump for conveying fluids with a high gas-liquid ratio of the present invention can achieve gas degassing and unblocking in oil fields with a high gas-liquid ratio through the mixed-flow pump itself, and no separate additional liquid replenishment skid-mounted device or manual exhaust or artificial liquid addition is required. It can reduce engineering investment, simplify production processes, reduce associated gas emissions, improve conveying efficiency, and reduce energy consumption, so as to promote the development of smart oil fields in my country. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of a mixed rotor pump for conveying fluids with a high gas-liquid ratio according to the present invention;

[0040] Figure 2 is a structural schematic diagram of a first gap sealing assembly;

[0041] Figure 3 is a schematic structural diagram of a second gap sealing assembly;

[0042] Figure 4 is a schematic structural diagram of a third gap sealing assembly;

[0043] Figure 5 is a structural schematic diagram of a fourth gap sealing assembly;

[0044] Figure 6 is a schematic structural diagram of a fifth gap sealing assembly;

[0045] Figure 7 This is a schematic diagram of the structure of the sixth gap sealing component Figure 1 ;

[0046] Figure 8 This is a schematic diagram of the structure of the sixth gap sealing component Figure 2 ;

[0047] Fig. 9 This is a schematic diagram of the structure of the sixth gap sealing component Figure 3 ;

[0048] Fig.10is a schematic structural diagram of the seventh gap sealing assembly;

[0049] Fig.11 is a schematic structural diagram of an eighth gap sealing assembly;

[0050] Among them, the main rotor 110, the auxiliary rotor 120, the end cover groove 131, the first end cover 130, the second end cover 140, the pump body 150, the pump cavity 151, the shaft 160, the meshing surface 001, the first gap sealing assembly 200, the first elastic block 210, the first arc elastic plate 211, the first square elastic plate 212, the first positioning space 213, the first positioning block 220, the first leaf spring 230, the second gap sealing assembly 300, the second elastic block 310, the second arc elastic plate 311, the second square elastic plate 312, the second positioning Space 313, second positioning block 320, second leaf spring 330, first spring 410, third elastic block 420, first buffer ring 510, second buffer ring 520, side plate 610, positioning pin 611, third leaf spring 620, second spring 711, fourth elastic block 712, buffer pad 713, liquid channel 810, arc channel 811, horizontal channel 812, first rotor groove 010, first placement groove 011, first positioning groove 012, second rotor groove 020, second positioning groove 021, second placement groove 022. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] The terms "first" and "second" in the specification and claims herein are used to distinguish different objects rather than to describe a specific order of objects. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more, for example, multiple processing units refer to two or more processing units, etc., multiple elements refer to two or more elements, etc.

[0053] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0054] When the mixed pump inlet is a pure gas slug flow or a very small amount of liquid (i.e. a high gas-liquid ratio, a high gas-liquid ratio refers to a fluid with a small amount of liquid (gas content > 75%) or no liquid (gas content 100%)), there is a gap between the rotor and the pump body. When a slug flow occurs and there is no liquid for liquid sealing, the high-pressure chamber and the low-pressure chamber will be connected, and the sealing effect cannot be achieved, resulting in an "air blockage" phenomenon. Air blockage at the pump inlet causes the pressure to continue to rise, increasing safety hazards, reducing the efficiency of the pump, shortening the life of the pump, and in severe cases, leading to problems such as medium mixed transportation failure. To this end, the mixed rotor pump for conveying fluids with a high gas-liquid ratio of the present invention adopts a gap sealing structure including at least one of a first gap sealing component, a second gap sealing component, a third gap sealing component, a fourth gap sealing component, a fifth gap sealing component, a sixth gap sealing component, and a seventh gap sealing component. A variety of variable and detachable gap sealing structures are used. According to actual on-site needs, when the mixed pump being used conveys media with different gas-liquid ratios and gas blockage occurs, the meshing gap, the cavity gap, and the end face gap can be sealed by freely matching and combining methods to eliminate gas blockage.

[0055] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0056] Please refer to Figure 1-11 :

[0057] A mixed rotor pump for high gas-liquid ratio fluid transportation includes a main rotor 110, an auxiliary rotor 120, an end cover, a pump body 150 and a gap sealing structure, wherein the auxiliary rotor 120 meshes with the main rotor 110. The end cover includes a first end cover 130 and a second end cover 140 of the same structure and shape, two rotating shafts 160 are rotatably installed between the first end cover 130 and the second end cover 140, the main rotor 110 and the auxiliary rotor 120 are respectively installed on the two rotating shafts 160, and the two rotating shafts 160 rotate to drive the main rotor 110 and the auxiliary rotor 120 to mesh and rotate. The pump body 150 is located between the first end cover 130 and the second end cover 140, and the first end cover 130 and the pump body 150, as well as the second end cover 140 and the pump body 150, are connected by bolts and nuts, and the pump body 150 has a pump cavity 151, and the main rotor 110 and the auxiliary rotor 120 are both located in the pump cavity 151. The gap sealing structure includes at least one of the first gap sealing assembly 200, the second gap sealing assembly 300, the third gap sealing assembly, the fourth gap sealing assembly, the fifth gap sealing assembly, the sixth gap sealing assembly, and the seventh gap sealing assembly. The gap sealing structure needs to realize the meshing gap sealing, the cavity gap sealing, and the end face gap sealing at the same time. The meshing gap is formed by the meshing surface of the main rotor 110 and the auxiliary rotor 120. The cavity gap is formed by the gap between the pump cavity 151 and the main rotor 110, and the pump cavity 151 and the auxiliary rotor 120. The end face gap is formed by the gap between the end face of the main rotor 110 and the first end cover 130 and the second end cover 140, and the gap between the end face of the auxiliary rotor 120 and the first end cover 130 and the second end cover 140. The meshing gap, the cavity gap, and the end face gap are all in the range of 0.03-0.3mm.

[0058] In a specific implementation process, the main rotor 110 and the auxiliary rotor 120 both have a meshing surface 001 and two end surfaces, and the meshing surface 001 is located between the two end surfaces.

[0059] Please refer to Figure 2In the specific implementation process, multiple first gap sealing assemblies 200 are installed on the main rotor 110 and the auxiliary rotor 120, and the multiple first gap sealing assemblies 200 are equidistantly arranged on the main rotor 110 and the auxiliary rotor 120. The first gap sealing assembly 200 includes a first elastic block 210, a first positioning block 220 and a first leaf spring 230. The first elastic block 210 is installed on the meshing surface 001 of the main rotor 110 and the auxiliary rotor 120, and the first two opposite ends of the first elastic block 210 have a first positioning space 213. Specifically, the first elastic block 210 includes a first arc-shaped elastic plate 211 and a first square elastic plate 212 that are fixedly connected, and the first arc-shaped elastic plate 211 and the first square elastic plate 212 are welded or integrally formed. The length of the first square elastic plate 212 is less than the length of the first arc-shaped elastic plate 211, so that when the first square elastic plate 212 is fixed to the first arc-shaped elastic plate 211, gaps are formed at both ends to form the first positioning space 213. The length of the first arc-shaped elastic plate 211 is equal to the thickness of the main rotor 110. In this embodiment, the thickness of the main rotor 110 and the auxiliary rotor 120 are the same. The first arc-shaped elastic plate 211 is installed on the meshing surface 001 of the main rotor 110 and the auxiliary rotor 120 to achieve the sealing of the meshing gap and the gap in the cavity. There are two first positioning blocks 220, and the two first positioning blocks 220 are respectively installed on the two opposite end faces of the main rotor 110 and the auxiliary rotor 120, and the two first positioning blocks 220 are respectively located in the two first positioning spaces 213. The first positioning blocks 220 installed on the end faces are used to achieve the positioning of the two ends of the first gap sealing assembly 200 and the sealing of the end face gap.

[0060] The first leaf spring 230 is mounted on the first elastic block 210 and is located between the two first positioning blocks 220. Specifically, the first leaf spring 230 is mounted on the first square elastic plate 212, and the first leaf spring 230 is embedded in the main rotor 110 and the auxiliary rotor 120. Specifically, the meshing surfaces 001 of the main rotor 110 and the auxiliary rotor 120 both have a first rotor groove 010, and the first rotor groove 010 runs through the two end surfaces of the main rotor 110 and the auxiliary rotor 120. The first rotor groove 010 includes a first placement groove 011 and first positioning grooves 012 located at both ends of the first placement groove 011. The first positioning block 220 is embedded and installed in the first positioning groove 012, and the first leaf spring 230 and the first elastic block 210 are both located in the first placement groove 011.

[0061] After the first arc-shaped elastic plate 211 and the first positioning block 220 are installed, the outer surface exposed on the main rotor 110 and the auxiliary rotor 120 can change according to the contacted gap sealing surface. If the contacted sealing gap surface is a plane, it is adjusted to a plane; if it is a curved surface, it is adjusted to a curved surface.

[0062] Please refer to Figure 3In the specific implementation process, multiple second gap sealing assemblies 300 are installed on the main rotor 110 and the auxiliary rotor 120, and multiple second gap sealing assemblies 300 are installed on the main rotor 110 and the auxiliary rotor 120 at equal distances. The second gap sealing assembly 300 includes a second elastic block 310, a second positioning block 320 and a second leaf spring 330. The second elastic block 310 is installed on both end surfaces of the main rotor 110 and the auxiliary rotor 120. The second elastic block 310 is installed along the radial direction of the main rotor 110 and the auxiliary rotor 120, and one end of the second elastic block 310 has a second positioning space 313. Specifically, the second elastic block 310 includes a second arc-shaped elastic plate 311 and a second square elastic plate 312 that are fixedly connected. The length of the second square elastic plate 312 is less than the length of the second arc-shaped elastic plate 311. When the second square elastic plate 312 is fixed on the second arc-shaped elastic plate 311, notches are formed at both ends to form the second positioning space 313. The second arc-shaped elastic plate 311 is installed on the end surfaces of the main rotor 110 and the auxiliary rotor 120 to seal the end surface gap.

[0063] The second positioning block 320 is mounted on the meshing surface 001 of the main rotor 110 and the auxiliary rotor 120, and the second positioning block 320 is located in the second positioning space 313. One end of the second gap sealing assembly 300 is positioned by the second positioning block 320, and the other end is positioned by the rotating shaft 160. The second positioning block 320 is mounted on the meshing surface 001 of the main rotor 110 and the auxiliary rotor 120, and is used to seal the cavity gap and the meshing gap.

[0064] The second leaf spring 330 is mounted on the second elastic block 310. Specifically, the second leaf spring 330 is mounted on the second square elastic plate 312. The second leaf spring 330 is embedded in the main rotor 110 and the auxiliary rotor 120. The end surfaces of the main rotor 110 and the auxiliary rotor 120 are both provided with a second rotor groove 020. The second rotor groove 020 includes a second positioning groove 021 and a second placement groove 022. The second placement groove is radially arranged along the main rotor 110 and the auxiliary rotor 120, and the second placement groove 022 passes through the meshing surface. The second leaf spring 330 and the second elastic block 310 are both located in the second placement groove 022, and the second positioning block 320 is located in the second positioning groove 021.

[0065] After the second arc-shaped elastic plate 311 and the second positioning block 320 are installed, the outer surface exposed on the main rotor 110 and the auxiliary rotor 120 can change according to the contacted gap sealing surface. If the contacted sealing gap surface is a plane, it is adjusted to a plane; if it is an arc surface, it is adjusted to an arc surface.

[0066] Please refer to Figure 4In the specific implementation process, the third gap sealing assembly is installed on the main rotor 110 and the auxiliary rotor 120 and / or the inner wall of the pump chamber 151. Only the third gap sealing assembly installed on the main rotor 110 and the auxiliary rotor 120 forms a meshing gap seal, and the third gap sealing assembly installed on the inner wall of the pump chamber 151, the main rotor 110 and the auxiliary rotor 120 form a meshing gap seal and an intra-cavity gap seal. The third gap sealing assembly includes a first spring 410 and a third elastic block 420. The first spring 410 is embedded in the main rotor 110 and the auxiliary rotor 120, and / or embedded in the inner wall of the pump chamber 151. The third elastic block 420 is connected to the first spring 410, and the third elastic block 420 is installed on the meshing surface 001 of the main rotor 110 and the auxiliary rotor 120, and / or installed on the inner wall surface of the pump chamber 151. The third elastic block 420 varies according to the shape of the gap sealing surface it contacts, and an exemplary embodiment includes a concave elastic block with a side away from the first spring 410 being a concave arc surface (such as Figure 4 a), or a convex elastic block with a convex arc surface away from the first spring 410 (such as Figure 4 b) in the figure, or a circular elastic block that is generally circular (such as Figure 4 c) in.

[0067] In a specific implementation process, the first arc-shaped elastic plate 211 and the second arc-shaped elastic plate 311 may also be replaced by the third elastic block 420 , which can be flexibly changed according to the shape of the gap sealing surface in contact.

[0068] Please refer to Figure 5 In the specific implementation process, a fourth gap sealing assembly is installed on the main rotor 110, the auxiliary rotor 120 and / or the inner wall of the pump chamber 151. Only the fourth gap sealing assembly installed on the main rotor 110 and the auxiliary rotor 120 forms an engaging gap seal, and the fourth gap sealing assembly installed on the inner wall of the pump chamber 151, the main rotor 110 and the auxiliary rotor 120 form an engaging gap seal and an intra-cavity gap seal; the fourth gap sealing assembly includes a first buffer ring 510 wrapped around the main rotor 110 and the auxiliary rotor 120, and / or a second buffer ring 520 attached to the inner wall of the pump chamber 151.

[0069] Please refer to Figure 6 , please refer to Figure 6In the specific implementation process, the opposite ends of the main rotor 110 and the auxiliary rotor 120 are both installed with fifth gap sealing assemblies for end face gap sealing. The two fifth gap sealing assemblies are respectively correspondingly attached to the first end cover 130 and the second end cover 140. The fifth gap sealing assembly includes a side plate 610 and a third leaf spring 620. The side plates 610 in the two fifth gap sealing assemblies are respectively installed on the first end cover 130 and the second end cover 140 through positioning pins 611. The third leaf spring 620 is installed at the opposite ends of the same side of the side plate 610. The two third leaf springs 620 correspond to the main rotor 110 and the auxiliary rotor 120 respectively. The positions corresponding to the third leaf springs 620 on the first end cover 130 and the second end cover 140 are both provided with end cover grooves, and the third leaf spring 620 is embedded in the end cover groove 131.

[0070] Please refer to Figure 7 and Figure 8 In the specific implementation process, the opposite ends of the main rotor 110 and the auxiliary rotor 120 are both installed with sixth gap sealing assemblies for end face gap sealing. The two sixth gap sealing assemblies are respectively fitted on the first end cover 130 and the second end cover 140, and the sixth gap sealing assembly includes a side plate 610 and a buffer assembly. The side plates 610 in the two sixth gap sealing assemblies are respectively installed on the first end cover 130 and the second end cover 140 through positioning pins 611. The buffer assembly is installed on the side plate 610, and the buffer assembly includes a second spring 711 and a fourth elastic block 712 connected to the second spring 711. The second spring 711 is embedded and installed in the side plate 610, and the fourth elastic block 712 is installed on the end surface of the side plate 610 facing the main rotor 110 and the auxiliary rotor 120. Specifically, the side plate 610 is elastic, and the side plate 610 can be fitted with the main rotor 110 and the auxiliary rotor 120 (see Figure 7 ), or the side plate 610 may be embedded and installed on the end surface of the main rotor 110 and the auxiliary rotor 120 (see Figure 8 ), but no matter which method is used, the side of the side plate 610 on which the fourth elastic block 712 is installed always faces the main rotor 110 and the auxiliary rotor 120.

[0071] In addition, please refer to Fig. 9 The sixth gap sealing component can also be a buffer pad 713 made of elastic material, which is attached between the main rotor 110 and the auxiliary rotor 120 and the first end cover 130, and between the main rotor 110 and the auxiliary rotor 120 and the second end cover 140 to achieve end face gap sealing.

[0072] Please refer to Fig.10In the specific implementation process, the opposite ends of the main rotor 110 and the auxiliary rotor 120 are both installed with the seventh gap sealing assembly for realizing the end face gap sealing. The two seventh gap sealing assemblies are respectively correspondingly attached to the first end cover 130 and the second end cover 140. The seventh gap sealing assembly includes a side plate 610 and a liquid channel 810. The side plate 610 is installed on the first end cover 130 and the second end cover 140; the liquid channel 810 is arranged on one end face of the side plate 610 facing the main rotor 110 and the auxiliary rotor 120. The liquid channel is filled with liquid, and the liquid is preferably oil such as petroleum. This oil can not only play a sealing role, but also play a role in cooling and heat dissipation. The liquid channel includes an arc channel 811 and a horizontal channel 812, and the arc channel 811 and the horizontal channel 812 are designed around the main rotor 110 and the auxiliary rotor 120.

[0073] In the specific implementation process, the first elastic block 210, the first positioning block 220, the first leaf spring 230, the second elastic block 310, the second positioning block 320, the second leaf spring 330, the third elastic block 420, the first buffer ring 510, the second buffer ring 520, the elastic side plate 610, the third leaf spring 620, the fourth elastic block 712, and the buffer pad are all elastic elements made of elastic materials, for example: nitrile rubber, Fe-Ni-Cr series, Ni-Ct series, Ni-Cr-Nb series, Ni-Co-Cr series, Nb-Ti series, Fe-Ni-Co series, tin phosphor bronze, beryllium bronze, fluororubber, etc., are used to manufacture springs, elastic elements and mechanical seals.

[0074] Please refer to Fig.11 In the specific implementation process, the first elastic block 210, the first leaf spring 230 and the first positioning block 220 can also be installed in the pump cavity 151 of the pump body 150 to form an eighth gap sealing assembly for sealing the gap in the cavity. The connection method between the first elastic block 210, the first leaf spring 230 and the first positioning block 220 and the installation method on the pump body 150 are the same as those of the first gap sealing assembly 200.

[0075] The above-mentioned first gap sealing assembly 200, second gap sealing assembly 300, third gap sealing assembly, fourth gap sealing assembly, fifth gap sealing assembly, sixth gap sealing assembly, seventh gap sealing assembly and eighth gap sealing assembly can be freely combined according to actual needs. After selecting the combination, only any one of the meshing gap, cavity gap and end face gap can be sealed, or any two of the meshing gap, cavity gap and end face gap can be sealed. Of course, in order to better avoid the occurrence of "air blockage" and improve the conveying efficiency, it is the best choice to select and combine the eight gap sealing assemblies to simultaneously seal the meshing gap, cavity gap and end face gap.

[0076] Exemplarily, the first gap sealing assembly 200 and the second gap sealing assembly 300 can be selected in combination to simultaneously achieve sealing of the meshing gap, the cavity gap, and the end face gap. The fourth gap sealing assembly and the fifth gap sealing assembly can be selected in combination. The seventh gap sealing assembly and the first gap sealing assembly 200 can be selected in combination. The third gap sealing assembly and the sixth gap sealing assembly can be selected in combination.

[0077] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention. The techniques, shapes, and structural parts not described in detail in the present invention are all known technologies.

Claims

1. A mixed rotor pump for high gas-liquid ratio fluid transportation, characterized in that: include: Main rotor; an auxiliary rotor meshing with the main rotor; End caps, including a first end cap and a second end cap; A pump body, located between the first end cover and the second end cover, the pump body having a pump cavity, the main rotor and the auxiliary rotor both being located in the pump cavity; A gap sealing structure, comprising at least one of a first gap sealing assembly, a second gap sealing assembly, a third gap sealing assembly, a fourth gap sealing assembly, a fifth gap sealing assembly, a sixth gap sealing assembly, and a seventh gap sealing assembly, wherein the gap sealing structure needs to simultaneously realize meshing gap sealing, intra-cavity gap sealing, and end face gap sealing, wherein the meshing gap is formed by the meshing surfaces of the main rotor and the auxiliary rotor, the intra-cavity gap is formed by the gaps between the pump cavity and the main rotor, and between the pump cavity and the auxiliary rotor, and the end face gap is formed by the gaps between the end face of the main rotor and the first end cover and the second end cover, and the gaps between the end face of the auxiliary rotor and the first end cover and the second end cover.

2. The mixed rotor pump for conveying fluids with a high gas-liquid ratio according to claim 1, characterized in that: A plurality of first gap sealing assemblies are installed on the main rotor and the auxiliary rotor, and the first gap sealing assemblies include: A first elastic block is mounted on the meshing surface of the main rotor and the auxiliary rotor, and opposite ends of the first elastic block each have a first positioning space; A first positioning block, wherein there are two first positioning blocks, the two first positioning blocks are respectively mounted on two opposite end surfaces of the main rotor and the auxiliary rotor, and the two first positioning blocks are respectively located in two first positioning spaces; The first leaf spring is mounted on the first elastic block and is located between the two first positioning blocks. The first leaf spring is embedded in the main rotor and the auxiliary rotor.

3. The mixed-flow rotor pump for conveying fluids with a high gas-liquid ratio according to claim 2, characterized in that: The first elastic block comprises a first arc-shaped elastic plate and a first square elastic plate which are fixedly connected, the length of the first arc-shaped elastic plate is equal to the thickness of the main rotor, and the first leaf spring is mounted on the first square elastic plate; The meshing surfaces of the main rotor and the auxiliary rotor both have a first rotor groove, which runs through the two end surfaces of the main rotor and the auxiliary rotor. The first rotor groove includes a first placement groove and first positioning grooves located at both ends of the first placement groove. The first positioning block is embedded in the first positioning groove, and the first leaf spring and the first elastic block are both located in the first placement groove.

4. The mixed rotor pump for conveying fluids with a high gas-liquid ratio according to claim 1, characterized in that: A plurality of second gap sealing assemblies are installed on the main rotor and the auxiliary rotor, and the second gap sealing assemblies include: A second elastic block is installed on two end surfaces of the main rotor and the auxiliary rotor, the second elastic block is installed along the radial direction of the main rotor and the auxiliary rotor, and one end of the second elastic block has a second positioning space; A second positioning block is installed on the meshing surface of the main rotor and the auxiliary rotor, and the second positioning block is located in the second positioning space; The second leaf spring is mounted on the second elastic block, and the second leaf spring is embedded in the main rotor and the auxiliary rotor.

5. The mixed-flow rotor pump for conveying fluids with a high gas-liquid ratio according to claim 4, characterized in that: The second elastic block comprises a second arc-shaped elastic plate and a second square elastic plate that are fixedly connected, and the second leaf spring is mounted on the second square elastic plate; The end faces of the main rotor and the auxiliary rotor both have a second rotor groove, the second rotor groove includes a second positioning groove and a second placement groove, the second placement groove is radially arranged along the main rotor and the auxiliary rotor, and the second placement groove passes through the meshing surface, the second leaf spring and the second elastic block are both located in the second placement groove, and the second positioning block is located in the second positioning groove.

6. The mixed-flow rotor pump for conveying fluids with a high gas-liquid ratio according to claim 1, characterized in that: The main rotor and the auxiliary rotor and / or the inner wall of the pump cavity are equipped with a third gap sealing assembly, and only the third gap sealing assembly installed on the main rotor and the auxiliary rotor forms a meshing gap seal, and the third gap sealing assembly installed on the inner wall of the pump cavity, the main rotor and the auxiliary rotor forms a meshing gap seal and an inner cavity gap seal; The third gap sealing assembly comprises: A first spring is embedded in the main rotor and the auxiliary rotor, and / or embedded in the inner wall of the pump chamber; The third elastic block is connected to the first spring and is installed on the meshing surfaces of the main rotor and the auxiliary rotor and / or on the inner wall surface of the pump chamber.

7. The mixed-flow rotor pump for conveying fluids with a high gas-liquid ratio according to claim 1, characterized in that: A fourth gap sealing assembly is installed on the main rotor and the auxiliary rotor and / or the inner wall of the pump chamber, and only the fourth gap sealing assembly installed on the main rotor and the auxiliary rotor forms an engaging gap seal, and the fourth gap sealing assembly installed on the inner wall of the pump chamber, the main rotor and the auxiliary rotor forms an engaging gap seal and an intra-cavity gap seal; the fourth gap sealing assembly includes a first buffer ring wrapped around the main rotor and the auxiliary rotor, and / or a second buffer ring attached to the inner wall of the pump chamber.

8. The mixed-flow rotor pump for conveying fluids with a high gas-liquid ratio according to claim 1, characterized in that: The opposite ends of the main rotor and the auxiliary rotor are both equipped with fifth gap sealing assemblies, and the two fifth gap sealing assemblies are respectively attached to the first end cover and the second end cover, and the fifth gap sealing assembly includes: A side plate mounted on the first end cover and the second end cover; The third leaf spring is installed at the opposite ends of the side plate, and the two third leaf springs correspond to the main rotor and the auxiliary rotor respectively. The positions corresponding to the third leaf springs on the first end cover and the second end cover are both provided with end cover grooves, and the third leaf spring is embedded in the end cover grooves.

9. The mixed-flow rotor pump for conveying fluids with a high gas-liquid ratio according to claim 1, characterized in that: The sixth gap sealing assembly is installed at both opposite ends of the main rotor and the auxiliary rotor, and the two sixth gap sealing assemblies are respectively attached to the first end cover and the second end cover, and the sixth gap sealing assembly includes: A side plate mounted on the first end cover and the second end cover; A buffer assembly is mounted on the side plate, the buffer assembly comprises a second spring and a fourth elastic block connected to the second spring, the second spring is embedded in the side plate, and the fourth elastic block is mounted on the end surface of the side plate facing the main rotor and the auxiliary rotor; Alternatively, the sixth gap sealing component is a buffer pad made of elastic material.

10. The mixed-flow rotor pump for conveying fluids with a high gas-liquid ratio according to claim 1, characterized in that: The main rotor and the auxiliary rotor are both provided with a seventh gap sealing assembly at opposite ends thereof, and the two seventh gap sealing assemblies are respectively attached to the first end cover and the second end cover, and the seventh gap sealing assembly comprises: A side plate mounted on the first end cover and the second end cover; A liquid channel is arranged at one end of the side plate facing the main rotor and the auxiliary rotor. The liquid channel is filled with liquid. The liquid channel includes an arc channel and a horizontal channel. The arc channel and the horizontal channel are designed around the main rotor and the auxiliary rotor.

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