CN109340120B - A kind of four volute chambers three outlet self-balancing multi-stage pump - Google Patents

Abstract

The present invention provides a kind of four volute chambers three to export self-balancing multi-stage pump, it include: the inlet segment being arranged in pump case, water exit end and secondary inlet segment, the inlet segment and secondary inlet segment are symmetrically disposed in the two sides of the water exit end, the first predetermined angle inlet segment import is provided on the inlet segment, the secondary inlet segment import of the second predetermined angle is provided on the secondary inlet segment, a high-pressure outlet and two low tension outlets are provided on the water exit end, guide vane is provided between the inlet segment and the water exit end, the water exit end and described return guide vane is provided between secondary water section, the guide vane and the return guide vane are symmetrically disposed in the two sides of the water exit end, the central part of the pump case is axially disposed central axis, the guide vane and the return guide vane are set on the pump case.Four volute chambers three of the invention export self-balancing multi-stage pump, avoid axial pulse when axial float and the operation when starting of pump rotor component, effectively improve reliability.

Description

A self-balancing multistage pump with four vortex chambers and three outlets

technical field

The invention relates to the technical field of multistage pumps, in particular to a self-balancing multistage pump with four vortex chambers and three outlets.

Background technique

Segmental multistage pump is a high lift pump widely used in electric power, coal mining, oilfield water injection and petrochemical industries. With the development of industry, the unit capacity of segmental multi-stage pumps is getting bigger and bigger. In addition to efficiency and cavitation performance, the requirements for pump reliability are also getting higher and higher. However, there is no unified calculation formula related to design parameters for reliability, so design often becomes an abstract requirement and cannot be estimated in advance. The use of high-quality steel is one aspect of improving the reliability of the pump, but as a designer, reasonable structural design is undoubtedly another aspect of reliability.

At present, the structure of the segmental multistage pump in the prior art is complicated and not reasonable enough. For example, the Chinese patent whose publication number is CN2646424Y discloses a high-pressure self-balancing segmental centrifugal pump, including pump rotor parts, pump casing, front and rear bearing parts and tension bolts, and the symmetrically arranged impeller rotor parts and the casing. The segmental type is organically combined, and the external pipe is used to form the flow channel required for the symmetrical arrangement of the impeller; the shell is divided into the water inlet section, the middle section, the water outlet section and the inner flow channel water inlet section according to the segmental form and series. The sections are arranged in the middle of the pump, and each section is fastened by segmented tension bolts to form the whole of the pump casing; a combined seal is formed by multi-stage non-contact screw seals and mud-like joint filler sealing parts injected with new synthetic materials . The combined seal refers to the multi-stage non-contact spiral seal composed of the impeller interstage seal, the intermediate shaft sleeve seal and the throttling bush seal; the balance chamber communicated with the low-pressure chamber; the mud-like caulking of new synthetic materials Material seal and cup-type stuffing box.

The disadvantage of this segmental multistage pump in the prior art is very obvious. Because its multistage impellers are arranged in the same direction, the axial force generated during operation is as high as tens of tons, which must be balanced by a balance plate mechanism. When the balance plate mechanism is not enough to balance the axial force, the rest of the axial force is borne by the angular contact ball bearing. When the operating conditions change frequently, changes in the axial force will inevitably cause frequent movement of the pump rotor components, which often causes instantaneous friction on the balance plate, and even causes shaft broken accidents due to the seizure of the balance plate. In order to reduce the hidden danger of balance plate seizure, angular contact ball bearings are used to limit the position and bear the remaining axial force, but the dynamic balance function of the balance plate is limited. Therefore, the mutual interference between the balance disc and the angular contact ball bearing of this type of pump when the operating conditions change frequently is the fatal factor leading to the short service life and poor reliability of both under some operating conditions.

Contents of the invention

In view of this, the present invention proposes a self-balancing multistage pump with four scroll chambers and three outlets, which aims to solve the problem that the existing multistage pumps are prone to generate axial force during operation, which makes the pump rotor parts move frequently, thereby affecting the multistage pump. service life and reliability issues.

The present invention proposes a self-balancing multistage pump with four vortex chambers and three outlets, comprising: a water inlet section, a water outlet section and a secondary water inlet section arranged on the pump casing, the water inlet section and the secondary water inlet section Symmetrically arranged on both sides of the water outlet section, the water inlet section is provided with a first preset angle inlet of the water inlet section, and the secondary water inlet section is provided with a secondary water inlet section with a second preset angle There is one high-pressure outlet and two low-pressure outlets on the water outlet section, guide vanes are arranged between the water inlet section and the water outlet section, and guide vanes are arranged between the water outlet section and the secondary water inlet section. Anti-guide vane, the guide vane and the anti-guide vane are symmetrically arranged on both sides of the water outlet section, the central part of the pump casing is provided with a central axis in the axial direction, the guide vane and the anti-guide vane The guide vanes are all sleeved on the pump casing, one end of the central shaft protrudes from the outside of the pump casing, and the end of the central shaft protruding from the outside of the pump casing is connected to the rotor component; wherein,

The _first preset angle δ1 of the inlet of the water inlet section is calculated according to the following formula:

in,

In the formula, δ ₁ is the preset angle of the inlet of the water inlet, L ₁ is the distance from the water inlet section to the water outlet section, H is the distance from the water outlet to the central axis of the pump, R is the diameter of the high-pressure outlet, and r ₁ is the water inlet diameter of, is the setting angle of the high-pressure water outlet;

The _second preset angle δ2 of the inlet of the secondary water inlet section is calculated according to the following formula:

in,

In the formula, δ ₂ is the preset angle of the inlet of the secondary water inlet, L ₂ is the distance from the secondary water inlet section to the water outlet section, H is the distance from the high-pressure water outlet to the central axis of the pump, and R is the diameter of the high-pressure water outlet , r ₂ is the diameter of the secondary water inlet, Sets the angle for the high pressure outlet.

further,

The cross-sectional curve of the side wall at the bottom of the inlet of the water inlet is composed of ab section, bc section, and cd section, and the three sections are respectively set according to the following curve rules, wherein,

The formula of segment ab curve is:

Among them, δ ₁ is the preset angle of the inlet of the water inlet, L ₁ is the distance from the inlet of the water inlet to the high-pressure water outlet, and r ₁ is the diameter of the inlet of the water inlet;

The formula of the bc segment curve is:

l ₂ ＝r ₁ ×[l ₁ ]×sin(δ ₁ +30)×tanδ ₁ (8)

Among them, δ ₁ is the preset angle of the inlet of the water inlet, [l ₁ ] is the length of the curve of segment ab, and r ₁ is the diameter of the inlet of the water inlet;

The formula of the cd segment curve is:

Among them, δ ₁ is the preset angle of the inlet of the water inlet, [l ₁ ] is the length of the curve of section ab, [l ₂ ] is the length of the curve of section bc, and r ₁ is the diameter of the inlet of the water inlet.

Further, in the self-balancing multi-stage pump with four vortex chambers and three outlets, the two low-pressure outlets are arranged in directions perpendicular to the axial direction of the central axis.

Further, in the self-balancing multistage pump with four vortex chambers and three outlets, the water outlet direction of the two low-pressure outlets is the same as the water outlet direction of the high-pressure outlet.

Further, in the self-balancing multi-stage pump with four vortex chambers and three outlets, the number of the guide vanes and the anti-guide vanes is equal, and the number of stages is the same as that of the multi-stage pump.

Further, in the self-balancing multistage pump with four vortex chambers and three outlets, a preset number of front middle sections and middle sections are arranged between the water inlet section and the water outlet section.

Further, in the self-balancing multi-stage pump with four scroll chambers and three outlets, when the number of stages of the multi-stage pump is greater than two, the preset number of the front and middle sections is two.

Further, in the above-mentioned four-volute three-outlet self-balancing multistage pump, when the number of stages of the multistage pump is greater than 3, the preset number of the middle section is 2n-6, where n is the number of stages of the multistage pump series.

Further, in the self-balancing multi-stage pump with four vortex chambers and three outlets, the central axes of the water inlet section, the water outlet section and the secondary water inlet section are all perpendicular to the central axis of the pump housing.

Further, in the self-balancing multi-stage pump with four vortex chambers and three outlets, the secondary water inlet section extends into the flow channel at the center of the pump housing, and is sealingly connected with the central shaft through a shaft seal component. .

Compared with the prior art, the beneficial effect of the present invention is that the self-balancing multistage pump with four scroll chambers and three outlets provided by the present invention is provided with a water inlet with a preset angle on the self-balancing multistage pump with four scroll chambers and three outlets, In order for the water flow to enter the pump body, it will have a counteracting effect on the inlet side wall of the water inlet section, forming a counteracting force opposite to the axial force generated inside the multi-stage pump during operation, thereby offsetting the axial force generated during the operation of the multi-stage pump. It effectively prevents the frequent movement of the pump rotor parts, ensures the stability of the multi-stage pump during operation, and improves the service life and reliability of the multi-stage pump.

Especially, in the present invention, when the distance from the inlet of the water inlet to the high-pressure water outlet is shorter and the diameter of the high-pressure water outlet is smaller, the preset angle of the inlet of the water inlet is larger, that is, the inlet of the water inlet tends to be closer to Right angle, the smaller the hedging effect between the water flow and the inlet side wall of the water inlet section during the process of entering the pump body; on the contrary, when the distance from the inlet of the water inlet to the high-pressure water outlet is longer, and the diameter of the high-pressure water outlet is larger, the water inlet will The smaller the preset angle of the inlet, that is, the inlet of the water inlet tends to be an acute angle, the greater the hedging effect between the water flow and the inlet side wall of the water inlet section during the process of entering the pump body; through the change of the pump body structure, the water flow will be changed. The size of the shock. In the same way, the greater the distance from the high-pressure water outlet to the central axis of the pump, the larger the diameter of the inlet of the water inlet, and the larger the preset angle of the inlet of the water inlet, that is, the inlet of the water inlet tends to be at a right angle, and the water flow when entering the pump The smaller the hedging effect with the inlet side wall of the water inlet section during the body process; the smaller the distance from the high-pressure water outlet to the central axis of the pump, the smaller the diameter of the inlet of the water inlet, and the smaller the preset angle of the inlet of the water inlet, that is, The inlet of the water inlet tends to be at an acute angle, and the greater the hedging effect between the water flow and the inlet side wall of the water inlet section during the process of entering the pump body. When the inlet is large, the water flow velocity is reduced to a certain extent. At this time, the balance of the counter force can be achieved by reducing the impact.

In particular, the self-balancing multistage pump with four vortex chambers and three outlets provided by the present invention sets a reverse water inlet with a preset angle on the secondary water inlet section opposite to the water inlet section on the other side of the water outlet section, and the reverse water inlet section Anti-guide vanes are installed in the middle, which generates reverse axial force during the operation of the multi-stage pump, and then offsets the axial force generated by the water inlet section during the operation of the multi-stage pump, further preventing frequent movement of the pump rotor components. Increased service life and reliability of multistage pumps.

Further, the self-balancing multi-stage pump with four vortex chambers and three outlets provided by the present invention further ensures the stability of the multi-stage pump during use by symmetrically setting the low-pressure outlets on both sides of the high-pressure outlet, and prolongs the life of the multi-stage pump. service life.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same reference numerals are used to designate the same components. In the attached picture:

Fig. 1 is the first structural diagram of a self-balancing multistage pump with four vortex chambers and three outlets provided by an embodiment of the present invention;

Fig. 2 is a side view of a self-balancing multistage pump with four scroll chambers and three outlets provided by an embodiment of the present invention;

Fig. 3 is a second structural schematic diagram of a self-balancing multistage pump with four vortex chambers and three outlets provided by an embodiment of the present invention;

Fig. 4 is a partial schematic diagram of Fig. 3 according to the embodiment of the present invention.

Detailed ways

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.

It should be noted that, in the description of the present invention, terms such as "upper", "lower", "left", "right", "inner", "outer" and other indicated directions or positional relationships are based on the terms shown in the accompanying drawings. The direction or positional relationship shown is only for convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In addition, it should be noted that, in the description of the present invention, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a It is a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediary, and it may be the internal communication of two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

Referring to Figures 1-2, the self-balancing multistage pump with four vortex chambers and three outlets provided by the embodiment of the present invention includes: a pump housing, a central shaft, a water inlet section 2, a water outlet section 6 and a secondary water inlet section 8; wherein, one end of the central shaft protrudes from the outside of the pump housing, and the end of the central shaft protruding from the outside of the pump housing is connected to the rotor component 1; the water outlet section 6 is arranged on the pump housing The middle part of the body, the water inlet section 1 and the secondary water inlet section 8 are arranged on the pump casing on both sides of the water outlet section. During use, water enters the pump body from the water inlet section 1 and the secondary water inlet section 8 respectively, and generates axial forces in opposite directions at the same time inside the water inlet section and the reverse water inlet section of the pump body , so that the axial force generated during the operation of the multi-stage pump is offset, preventing frequent movement of the pump rotor components, and improving the service life and reliability of the multi-stage pump.

Specifically, the water outlet section 6 is arranged in the middle of the pump housing, and is provided with a high-pressure outlet 61 and two low-pressure outlets 62; wherein, the high-pressure outlet 61 is the main outlet, and the two low-pressure outlets The outlet 62 is an auxiliary water outlet, and the pressure of the high-pressure water outlet is adjusted during the operation of the multi-stage pump to reduce damage to the pump body caused by the ultra-high pressure of the multi-stage pump and ensure the stability of the operation of the multi-stage pump. The two low-pressure outlets 62 are oppositely arranged on both sides of the high-pressure outlet 61 and perpendicular to the axial direction of the central axis of the multi-stage pump. Preferably, the water outlet direction of the two low-pressure outlets 62 is the same as the water outlet direction of the high-pressure outlet 61, so as to prevent the impact force in other directions from being generated by the two low-pressure outlets 62 during operation of the multi-stage pump. , thereby affecting the stability of the operation of the multistage pump.

Specifically, the water inlet section 2 is arranged on one side of the pump casing, and a certain number of front middle sections 3 and middle sections 5 are arranged between it and the water outlet section to ensure 6 to form ample pump body chamber. The number of settings of the front middle section 3 and the middle section 5 depends on the number of stages of the multistage pump. When the number of stages n of the multistage pump is greater than 2, the water inlet section 2 and the water outlet section 6 There are two front middle sections 3 arranged therebetween; when the number of stages n of the multistage pump is greater than 3, 2n-6 middle sections 5 are arranged between the front middle section 3 and the water outlet section 6 . For example, when the number of stages of the multistage pump is 4, two front middle sections 3 are arranged between the water inlet section 2 and the water outlet section 6, and between the front middle section 3 and the water outlet section 6 Set 2×4-6=2 middle section 5; when the number of stages of the multistage pump is 2, the front middle section 3 is not set; when the number of stages of the multistage pump is 2 and 3, the middle section 5 is not set. At the same time, a certain number of guide vanes 4 are provided inside the water inlet section 2, and the guide vanes 4 are sheathed on the central shaft, and the number of guide vanes 4 is the same as the number of stages of the multi-stage pump. At the same time, the water inlet section 2 is provided with an inlet 21 of the water inlet section to ensure that the water flow of the multi-stage pump can quickly and stably enter the inside of the pump body during operation.

Specifically, the inlet 21 of the water inlet section has a certain preset angle during the setting process, so that the water flow will have a counteraction with the inlet side wall of the water inlet section when it enters the pump body, forming an angle similar to that of the multistage pump when it is running. The counteracting force of the opposite direction of the axial force generated inside can offset the axial force generated during the operation of the multi-stage pump, prevent the frequent movement of the pump rotor parts, and ensure the stability of the multi-stage pump during operation. The _first preset angle δ1 of the inlet 21 of the water inlet section is calculated according to the following formula:

in,

In the formula, δ1 is the preset angle _of the inlet of the water inlet, L1 is the distance from the inlet _of the water inlet to the high-pressure water outlet, H is the distance from the high-pressure water outlet to the central axis of the pump, and R is the diameter of the high-pressure water outlet 21, r ₁ is the diameter of the inlet of the water inlet, is the setting angle of the high-pressure water outlet 61 , that is, the angle between the centerline of the high-pressure water outlet and the central axis of the pump.

In the embodiment of the present invention, when the distance from the inlet of the water inlet to the high-pressure water outlet is shorter and the diameter of the high-pressure water outlet is smaller, the preset angle of the inlet of the water inlet is larger, that is, the inlet of the water inlet tends to be closer to Right angle, the smaller the hedging effect between the water flow and the inlet side wall of the water inlet section during the process of entering the pump body; on the contrary, when the distance from the inlet of the water inlet to the high-pressure water outlet is longer, and the diameter of the high-pressure water outlet is larger, the water inlet will The smaller the preset angle of the inlet, that is, the inlet of the water inlet tends to be an acute angle, the greater the hedging effect between the water flow and the inlet side wall of the water inlet section during the process of entering the pump body; through the change of the pump body structure, the water flow will be changed. The size of the shock. In the same way, the greater the distance from the high-pressure water outlet to the central axis of the pump, the larger the diameter of the inlet of the water inlet, and the larger the preset angle of the inlet of the water inlet, that is, the inlet of the water inlet tends to be at a right angle, and the water flow when entering the pump The smaller the hedging effect with the inlet side wall of the water inlet section during the body process; the smaller the distance from the high-pressure water outlet to the central axis of the pump, the smaller the diameter of the inlet of the water inlet, and the smaller the preset angle of the inlet of the water inlet, that is, The inlet of the water inlet tends to be at an acute angle, and the greater the hedging effect between the water flow and the inlet side wall of the water inlet section during the process of entering the pump body. When the inlet is large, the water flow velocity is reduced to a certain extent. At this time, the balance of the counter force can be achieved by reducing the impact.

Continuing to refer to FIG. 4 , the embodiment of the present invention simultaneously sets the side wall 211 at the bottom of the inlet of the water inlet so that after the water flows into the pump body through the clean water end, a certain acceleration impact will be generated. Specifically, the cross-sectional curve of the side wall 211 in this embodiment is composed of section ab, section bc, and section cd, and the three sections are respectively set according to the following curve laws, wherein,

The formula of segment ab curve is:

Among them, δ ₁ is the preset angle of the inlet of the water inlet, L ₁ is the distance from the inlet of the water inlet to the high-pressure outlet, and r ₁ is the diameter of the inlet of the water inlet. The ab curve section protrudes toward the inlet of the water inlet, which reduces the size of the water inlet and makes the water flow in this section accelerate to a certain extent.

The formula of the bc segment curve is:

l ₂ ＝r ₁ ×[l ₁ ]×sin(δ ₁ +30)×tanδ ₁ (8)

Among them, δ ₁ is the preset angle of the inlet of the water inlet, [l ₁ ] is the length of the curve of segment ab, and r ₁ is the diameter of the inlet of the water inlet. In this embodiment, the bc curve section is a curved shape that is concave toward the side wall and approximates a circle. After the water flow is accelerated by the protruding section of the inlet of the water inlet, a strong impact and rebound will be generated there, causing the water flow to reversely accelerate. Hedging occurs.

The formula of the cd segment curve is:

Among them, δ ₁ is the preset angle of the inlet of the water inlet, [l ₁ ] is the length of the curve of section ab, [l ₂ ] is the length of the curve of section bc, and r ₁ is the diameter of the inlet of the water inlet. In this embodiment, the curve of section cd is a relatively smooth curve, and it transitions smoothly with the side wall, and there is a certain degree of cushioning after the impact of the water flow.

Specifically, the reverse water inlet section 8 is arranged on one side of the pump casing, and a certain number of front middle sections 3 and middle sections 5 are arranged between it and the water outlet section to ensure Ample pump body chambers are formed between the segments 6 . The number of settings of the front middle section 3 and the middle section 5 depends on the number of stages of the multistage pump. When the number of stages n of the multistage pump is greater than 2, the reverse water inlet section 8 and the water outlet section 6 There are two front middle sections 3 arranged therebetween; when the number of stages n of the multistage pump is greater than 3, 2n-6 middle sections 5 are arranged between the front middle section 3 and the water outlet section 6 . For example, when the number of stages of the multistage pump is 4, two front middle sections 3 are arranged between the reverse water inlet section 8 and the water outlet section 6, and two front middle sections 3 are arranged between the front middle section 3 and the water outlet section 6. Set 2×4-6=2 middle sections 5 between; when the number of stages of the multistage pump is 2, do not set the front middle section 3; when the number of stages of the multistage pump is 2,3, do not set the middle section 5. At the same time, a certain number of anti-guide vanes 7 are arranged inside the anti-water inlet section 8, and the anti-guide vanes 7 are sleeved on the central shaft, and the number of them is the same as the number of stages of the multi-stage pump, that is, The anti-guide vanes 7 and the number of the guide vanes 4 are also the same. At the same time, the reverse water inlet section 8 is provided with an inlet 81 of the reverse water inlet section to ensure that the water flow of the multi-stage pump can quickly and stably enter the inside of the pump body during operation. Preferably, the inlet 81 of the reverse water inlet section has a certain preset angle during the setting process, so that the water flow will have a hedge against the inlet side wall of the reverse water inlet section during the process of entering the pump body, forming a multi-stage pump. The counteracting force of the opposite direction of the axial force generated inside can offset the axial force generated during the operation of the multi-stage pump, prevent the frequent movement of the pump rotor parts, and ensure the stability of the multi-stage pump during operation. The _second preset angle δ2 of the inlet of the secondary water inlet section is calculated according to the following formula:

in,

In the formula, δ ₂ is the preset angle of the inlet of the reverse water inlet, L ₂ is the distance from the secondary water inlet section to the water outlet section, H is the distance from the high-pressure water outlet to the central axis of the pump, and R is the diameter of the high-pressure water outlet , r ₂ is the diameter of the reverse water inlet, Sets the angle for the high pressure outlet.

Preferably, the water inlet section 2, the water outlet section 6 and the secondary water inlet section 8 in the above embodiment are connected by a tie rod 9; the center of the water inlet section 2, the water outlet section 6 and the secondary water inlet section 8 The axes are all perpendicular to the central axis in the pump housing; the end of the central axis connected to the rotor part 1 is connected to the pump housing through a bearing body part 12; the end of the central axis away from the rotor part 1 is connected to the pump housing. The pump casings are connected through the second part 10 of the bearing body; the flow channel of the secondary water inlet section 8 extending into the center of the pump casing is connected with the central shaft through a shaft seal component 11 in a sealed connection.

In addition, the four-volume three-outlet self-balancing multistage pump is also provided with a side seat 13 and a middle seat 14. The side seat 13 and the middle seat 14 are arranged on the ground and are in contact with the ground, effectively ensuring that the four The stability of the vortex chamber three-outlet self-balancing multistage pump during operation.

Compared with the prior art, the beneficial effect of the present invention is that the self-balancing multistage pump with four scroll chambers and three outlets provided by the present invention is provided with a high-pressure water inlet with a preset angle on the self-balancing multistage pump with four scroll chambers and three outlets. , in order to have a hedging effect with the inlet side wall of the water inlet section during the water intake process, forming a counter force in the opposite direction to the axial force generated inside the multi-stage pump during operation, thereby offsetting the axial force generated during the operation of the multi-stage pump , Effectively prevent the frequent movement of the pump rotor parts, ensure the stability of the multi-stage pump during operation, and improve the service life and reliability of the multi-stage pump.

In particular, the self-balancing multistage pump with four vortex chambers and three outlets provided by the present invention is provided with a secondary water inlet section opposite to the water inlet section on the other side of the water outlet section, and anti-guide vanes are arranged in the reverse water inlet section, The reverse axial force is generated during the operation of the multi-stage pump, which then offsets the axial force generated by the water inlet section during the operation of the multi-stage pump, which further prevents the frequent movement of the pump rotor parts and improves the use of the multi-stage pump. longevity and reliability.

Further, the self-balancing multi-stage pump with four vortex chambers and three outlets provided by the present invention further ensures the stability of the multi-stage pump during use by symmetrically setting the low-pressure outlet on both sides of the high-pressure outlet, and prolongs the life of the multi-stage pump. service life.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. A self-balancing multistage pump with four vortex chambers and three outlets, characterized in that it comprises: a water inlet section, a water outlet section and a secondary water inlet section arranged on the pump housing, the water inlet section and the secondary water inlet section The water section is arranged symmetrically on both sides of the water outlet section, the water inlet section is provided with a first preset angle inlet of the water inlet section, and the secondary water inlet section is provided with a secondary water inlet section with a second preset angle. The inlet of the water inlet section, a high-pressure outlet and two low-pressure outlets are arranged on the water outlet section, guide vanes are arranged between the water inlet section and the water outlet section, and guide vanes are arranged between the water outlet section and the secondary water inlet section. Anti-guide vanes are provided, and the guide vanes and the anti-guide vanes are symmetrically arranged on both sides of the water outlet section. The anti-guide vanes are all sleeved on the pump casing, one end of the central shaft protrudes from the outside of the pump casing, and the end of the central shaft protruding from the outside of the pump casing is connected to the rotor component; in, The _first preset angle δ1 of the inlet of the water inlet section is calculated according to the following formula: in, In the formula, δ ₁ is the preset angle of the inlet of the water inlet, L ₁ is the distance from the inlet of the water inlet to the high-pressure water outlet, H is the distance from the high-pressure water outlet to the central axis of the pump, R is the diameter of the high-pressure water outlet, r ₁ is the diameter of the inlet of the water inlet, is the setting angle of the high-pressure water outlet; The _second preset angle δ2 of the inlet of the secondary water inlet section is calculated according to the following formula: in, In the formula, δ ₂ is the preset angle of the inlet of the secondary water inlet, L ₂ is the distance from the secondary water inlet section to the water outlet section, H is the distance from the high-pressure water outlet to the central axis of the pump, and R is the diameter of the high-pressure water outlet , r ₂ is the diameter of the secondary water inlet, Sets the angle for the high pressure outlet. 2. The self-balancing multistage pump with four vortex chambers and three outlets according to claim 1, characterized in that, The cross-sectional curve of the side wall at the bottom of the inlet of the water inlet is composed of ab section, bc section, and cd section, and the three sections are respectively set according to the following curve rules, wherein, The formula of segment ab curve is: Among them, δ ₁ is the preset angle of the inlet of the water inlet, L ₁ is the distance from the inlet of the water inlet to the high-pressure water outlet, and r ₁ is the diameter of the inlet of the water inlet; The formula of the bc segment curve is: l ₂ ＝r ₁ ×[l ₁ ]×sin(δ ₁ +30)×tanδ ₁ (8) Among them, δ ₁ is the preset angle of the inlet of the water inlet, [l ₁ ] is the length of the curve of segment ab, and r ₁ is the diameter of the inlet of the water inlet; The formula of the cd segment curve is: Among them, δ ₁ is the preset angle of the inlet of the water inlet, [l ₁ ] is the length of the curve of section ab, [l ₂ ] is the length of the curve of section bc, and r ₁ is the diameter of the inlet of the water inlet. 3. The self-balancing multistage pump with four scroll chambers and three outlets according to claim 2, wherein the installation directions of the two low-pressure outlets are both perpendicular to the axial direction of the central axis. 4. The self-balancing multistage pump with four vortex chambers and three outlets according to claim 3, characterized in that the water outlet direction of the two low-pressure outlets is perpendicular to the water outlet direction of the high-pressure outlet. 5 . The self-balancing multistage pump with four vortex chambers and three outlets according to claim 1 , wherein the number of guide vanes and the anti-guide vanes are equal, and the number of stages is the same as that of the multistage pump. 6. The self-balancing multi-stage pump with four vortex chambers and three outlets according to claim 3, wherein a preset number of front middle sections and middle sections are arranged between the water inlet section and the water outlet section. 7. The self-balancing multi-stage pump with four vortex chambers and three outlets according to claim 6, characterized in that, when the number of stages of the multi-stage pump is greater than 2, the preset number of the front and middle sections is 2. 8. The self-balancing multistage pump with four scroll chambers and three outlets according to claim 6, characterized in that, when the number of stages of the multistage pump is greater than 3, the preset number of the middle section is 2n-6, wherein n is the number of stages of the multistage pump. 9. The self-balancing multistage pump with four vortex chambers and three outlets according to claim 1, characterized in that, the central axes of the water inlet section, the water outlet section and the secondary water inlet section are all aligned with the center axis of the pump housing. The central axis is vertical. 10. The self-balancing multi-stage pump with four vortex chambers and three outlets according to claim 1, characterized in that, the secondary water inlet section extends into the flow channel at the center of the pump housing, and is aligned with the central shaft Sealed connection between shaft seal components.