CN115628235A - Volute of two open-ended centrifugal pump casings - Google Patents

Abstract

The application relates to a spiral case of two open-ended centrifugal pump casings, include: the shell body, first flow channel mouth, the second flow channel mouth, first flow channel board, second flow channel board and water inlet, the shell body presents discoid, the water inlet sets up in the positive central point of casing and puts, the central line of first flow channel mouth and the central line of second flow channel mouth are tangent with the shell body respectively, first flow channel mouth is central symmetry with the center of second flow channel mouth about the shell body, first flow channel board and second flow channel board all set up in the inside of shell body, first flow channel board and second flow channel board are the arc, first flow channel mouth and the inboard of shell body are connected to first flow channel board, the inboard of second flow channel mouth and shell body is connected to the second flow channel board, first flow channel board sets up in the inside rear side of shell body, the second flow channel board sets up in the inside front side of shell body, first flow channel board and second flow channel board are central symmetry about the center of shell body.

Description

Volute of two open-ended centrifugal pump casings

Technical Field

The invention relates to the field of centrifugal pumps, in particular to a volute of a double-opening centrifugal pump shell.

Background

Centrifugal pumps operate by causing water to move centrifugally as a result of the rotation of an impeller. Before the water pump is started, the pump shell and the water suction pipe are filled with water, then the motor is started, the pump shaft drives the impeller and the water to rotate at a high speed, the water is thrown to the outer edge of the impeller in a centrifugal motion, and flows into a water pressure pipeline of the water pump through a flow channel of the volute-shaped pump shell. However, the centrifugal pumps of today are often of the single outlet type, which results in that the rotational speed of the impeller must be increased when an increased water output is required, which results in an excessive working pressure of the centrifugal pump.

Disclosure of Invention

In order to overcome the disadvantages pointed out in the background art, i.e. to solve the problem that the centrifugal pump of the present day is often a single outlet type centrifugal pump, and the rotating speed of an impeller must be increased when the water yield needs to be increased, and the working pressure of the centrifugal pump is too high, the embodiment of the invention provides a volute of a centrifugal pump casing with double openings, which comprises: casing main part, first flow channel mouth, second flow channel mouth, first flow channel board, second flow channel board and water inlet, the casing main part presents discoid, the water inlet set up in the positive central point of casing puts, the central line of first flow channel mouth with the central line of second flow channel mouth respectively with the casing body is tangent, first flow channel mouth with the second flow channel mouth about the center of casing main part is central symmetry, first flow channel board with the second flow channel board all set up in the inside of casing main part, first flow channel board with the second flow channel board is the arc, first flow channel board is connected first flow channel mouth with the inboard of casing main part, the second flow channel board is connected the second flow channel mouth with the inboard of casing main part, first flow channel board set up in the inside rear side of casing main part, the second flow channel board set up in the inside front side of casing main part, first flow channel board with the second flow channel board about the center of casing main part is central symmetry.

As a preferable aspect of the present invention, in a connection portion between the first flow channel opening and the housing main body, with respect to a center line of the first flow channel opening, the first flow channel plate is connected to a point of tangency to connect the first flow channel opening to an outer side of the housing main body, and the first flow channel plate is not connected to a point of tangency to connect the first flow channel opening to an inner side of the housing main body; for the joint of the second flow channel opening and the shell body, relative to the central line of the second flow channel opening, the second flow channel plate is connected with the tangent point to connect the second flow channel opening with the outer side of the shell body, and the second flow channel plate is not connected with the tangent point to connect the second flow channel opening with the inner side of the shell body.

In a preferred aspect of the present invention, the first and second flow ports each include an annular protrusion, the annular protrusions are located at positions where the first and second flow ports are connected to the housing main body, and the annular protrusions restrict flow velocities at initial positions of the first and second flow ports.

In a preferred aspect of the present invention, the water inlet includes a water inlet gasket and a water inlet flange, the water inlet flange is connected to an outside of the housing body, and the water inlet gasket is seated at a connection portion of the water inlet flange and the housing body.

In a preferred embodiment of the present invention, a connection port for providing a space through which a motor shaft passes and a fixing plate for fixing the housing body to a motor casing connected thereto are provided on a back side of the housing body.

In a preferred aspect of the present invention, the first flow field plate head portion is provided with a first half opening located near an inner front side of the casing main body, and the second flow field plate head portion is provided with a second half opening located near an inner rear side of the casing main body.

As a preferable aspect of the present invention, with respect to the first half opening of the first flow path plate, with reference to a center line of the first flow path opening, a length of a projection of the first half opening onto the center line of the first flow path opening coincides with a length of a projection of a connection region of the first flow path opening and the housing main body onto the center line of the first flow path opening; regarding the second half opening of the second flow channel plate, with reference to the center line of the second flow channel opening, the length of the projection of the second half opening on the center line of the second flow channel opening is consistent with the length of the projection of the connecting area of the second flow channel opening and the housing main body on the center line of the second flow channel opening.

As a preferred aspect of the present invention, the tail end of the first flow channel plate is located on a radius where a tangent point of the center line of the second flow channel port to the housing body and a center of the housing body are connected, and the tail end of the second flow channel plate is located on a radius where a tangent point of the center line of the first flow channel port to the housing body and a center of the housing body are connected.

Through the implementation of the invention, the moving space of water in the space inside the first flow channel plate and the space inside the second flow channel plate is larger than the caliber of the first flow channel and the caliber of the second flow channel, so that the flow rate of water passing through the first flow channel and the second flow channel is relatively faster, the water inlet efficiency of the water inlet is fixed, and the inside of the shell body always has enough water volume to realize the stability of inertial centrifugal force and the stability of thrust, so that the flow rate of water in the first flow channel and the second flow channel is not reduced, and the flow rate of water flowing out from the flow channel opening is ensured while the water flow rate of water flowing out from the flow channel opening is larger than that of water flowing out from the single flow channel opening in the double-opening centrifugal pump.

Through the implementation of the invention, the first half opening and the second half opening only allow a part of water flow to pass through actually, and most of the water flow can still flow into the second flow channel and the first flow channel through the first flow channel plate and the second flow channel plate on the side without the opening, so that a large amount of water flow still enters the first flow channel and the second flow channel to improve the flow rate under the condition of ensuring that sufficient water flow exists in the first flow channel opening, and the water flow of the water outlet can be ensured while the water outlet efficiency in unit time is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only the embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 shows a sectional view of the volute construction of the present invention;

FIG. 2 shows a left side view of the volute of the present invention;

FIG. 3 shows a cross-sectional view along direction AA in FIG. 2;

FIG. 4 is a cross-sectional view taken along line BB of FIG. 2;

FIG. 5 is a diagram showing the relative positions of the first flow field plate and the volute of the present invention;

figure 6 is a diagram showing the relative positions of the second flow field plate and the volute of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Refer to fig. 1-6. The invention provides a volute of a double-opening centrifugal pump shell, which comprises: casing main part 1, first flow channel mouth 2, second flow channel mouth 3, first flow channel board 4, second flow channel board 5 and water inlet, casing main part 1 presents discoid, the water inlet set up in the positive central point of casing puts, first flow channel mouth 2 the central line with second flow channel mouth 3 respectively with the casing body is tangent, first flow channel mouth 2 with second flow channel mouth 3 about the center of casing main part 1 is central symmetry, first flow channel board 4 with second flow channel board 5 all set up in the inside of casing main part 1, first flow channel board 4 with second flow channel board 5 is the arc, first flow channel board 4 is connected first flow channel mouth 2 with the inboard of casing main part 1, second flow channel board 5 is connected second flow channel mouth 3 with the inboard of casing main part 1, first flow channel board 4 set up in the inside rear side of casing main part 1, second flow channel board 5 set up in the inside front side of casing main part 1, second flow channel board 4 with second flow channel board 5 is about the center symmetry of casing main part 1.

In some embodiments, for the connection between the first flow channel opening 2 and the housing body 1, relative to the center line of the first flow channel opening 2, the first flow channel plate 4 connected to the tangent point connects the first flow channel opening 2 and the outer side of the housing body 1, and the first flow channel plate 4 not connected to the tangent point connects the first flow channel opening 2 and the inner side of the housing body 1; regarding the joint between the second channel opening 3 and the housing body 1, with respect to the center line of the second channel opening 3, the second channel plate 5 is connected to the tangent point to connect the second channel opening 3 and the outer side of the housing body 1, and the second channel plate 5 is not connected to the tangent point to connect the second channel opening 3 and the inner side of the housing body 1.

In some embodiments, the first flow port 2 and the second flow port 3 respectively include an annular protrusion, the annular protrusion is located at a connection position of the first flow port 2 and the second flow port 3 with the housing body 1, and the annular protrusion limits a flow rate of the initial position of the first flow port 2 and the second flow port 3.

In some embodiments, the water inlet comprises a water inlet gasket connected to the outside of the housing body 1 and a water inlet flange padded at the connection of the water inlet flange and the housing body 1.

In some embodiments, a connection port is formed on a back side of the housing body, the connection port extends through the fixing plate, the connection port is used for providing a space for a motor shaft to pass through, and the fixing plate is used for fixing the housing body on an associated motor casing.

In the implementation process, water enters the interior of the housing body 1 from the water inlet, the center line of the first flow channel port 2 facing the corresponding center line and the center line of the second flow channel port 3 facing the corresponding center lines are both tangent lines in the counterclockwise direction, and the rotation direction of the impeller arranged in the housing body 1 rotates counterclockwise. The first channel opening 2 and the second channel opening 3 are arranged in the horizontal direction, and since the first channel opening 2 and the second channel opening 3 are in central symmetry with respect to the center of the housing body 1, it can be seen that the first channel opening 2 is arranged at the upper left of the housing body 1, the second channel opening 3 is arranged at the lower right of the housing body 1, the first channel opening 2 and the second channel opening 3 are respectively connected with a pipeline, and the pipeline extends upward.

Because the first flow channel plate 4 is connected to the inner side of the connection part of the first flow channel port 2 and the shell body 1, and the outer side surface of the first flow channel plate 4 is arranged to have a certain distance with the arc-shaped side surface inside the shell body 1, a space through which water can pass exists between the outer side surface of the first flow channel plate 4 and the arc-shaped side surface of the shell body 1, and the space is marked as a first flow channel; because the second flow channel plate 5 is connected to the inner side of the connection between the second flow channel opening 3 and the housing body 1, and the outer side surface of the second flow channel plate 5 is arranged to have a certain distance from the arc-shaped side surface inside the housing body 1, a space through which water can pass exists between the outer side surface of the second flow channel plate 5 and the arc-shaped side surface of the housing body 1, and the space is marked as a second flow channel; furthermore, because the first flow passage plate 4 connects the inside of the junction between the first flow passage 2 and the housing body 1, and the second flow passage plate 5 connects the inside of the junction between the second flow passage 3 and the housing body 1, the first flow passage plate 4 and the second flow passage plate 5 respectively block part of the space of the first flow passage 2 and the second flow passage 3, so that water can only flow from the first flow passage and the second flow passage to the first flow passage 2 and the second flow passage 3.

When water enters the interior of the housing body 1, the function of a common centrifugal pump is implemented through counterclockwise rotation of the impeller, so that water flows in the interior of the housing body 1, due to the existence of the first flow channel plate 4 and the second flow channel plate 5, the water subjected to the effect of inertial centrifugal force is hindered by the first flow channel plate 4 and the second flow channel plate 5 in the process of radial movement, and due to the rotation of the impeller, the rotating impeller also has a certain tangential movement effect on the water flow, so that the water has a certain tangential movement capability, and during the process of tangential movement of water, due to the existence of the first flow channel plate 4 and the second flow channel plate 5, and the first flow channel plate 4 and the second flow channel plate 5 are arc-shaped, so that water inside the first flow channel plate 4 and the second flow channel plate 5 flows along the inner sides of the first flow channel plate 4 and the second flow channel plate 5, water inside the first flow channel plate 4 flows from the tail end of the first flow channel plate 4 to the first flow channel plate 4, during the period, water flows towards the tail end of the second flow channel plate 5, water flows towards the tail end of the first flow channel plate 5, water flows towards the second flow channel plate 5, water flows from the tail end of the second flow channel plate 4 to the head end of the second flow channel plate, and flows out of the second flow channel plate 2, water flows from the tail end of the second flow channel plate 5, water flow channel plate 2, water flows from the tail end of the first flow channel plate, water flow channel plate 2, water flows from the tail end of the second flow channel plate, water flow channel plate 5, water flow channel plate 2, water flow channel plate, water flows out of the second flow channel plate, and flows from the head end of the second flow channel plate 5.

For the water flowing to the tail end of the second flow channel plate 5 and the tail end of the first flow channel plate 4, due to the action of inertial centrifugal force, the water has a tendency of flowing radially (only blocked), and always enters the shell body 1, so that the water is pushed radially, in principle, the water has a tendency of being continuously pushed into the first flow channel and the second flow channel, and the moving space of the water in the space inside the first flow channel plate 4 and the space inside the second flow channel plate 5 is larger than the caliber of the first flow channel and the caliber of the second flow channel, so that the flow speed of the water passing through the first flow channel and the second flow channel is relatively faster; further, after water receives inertial centrifugal force, can have the inertia of corresponding atress, and the tangential motion's that the impeller rotation produced power also can cause certain thrust to water, inertia and thrust effect after the atress, water still can have certain acceleration effect inside first runner and second runner, and because the water inlet efficiency of intaking is fixed, then 1 inside sufficient water volume that has always can accomplish inertial centrifugal force's stability and the stability of thrust, thereby make water can not reduce at the inside velocity of flow of first runner and second runner, thereby in having guaranteed double-opening's centrifugal pump, when the water volume that rivers flow from the runner mouth is bigger than the water volume that single runner mouth flows, can guarantee the velocity of flow of the water that the runner mouth flows.

In the centrifugal pump with a single-flow-port, if the centrifugal pump is directly converted into a double-flow-port, the time for water to be stressed when the water is stressed in the radial direction is reduced, so that the static pressure energy of the water flow is relatively low, and the flow rate of the water is relatively low.

Refer to fig. 1-6. In some embodiments, the first flow field plate 4 is provided with a first half opening 6 at the head, the first half opening 6 is located near the inner front side of the housing body 1, the second flow field plate 5 is provided with a second half opening 7 at the head, and the second half opening 7 is located near the inner rear side of the housing body 1.

In some embodiments, for the first half opening 6 of the first runner plate 4, with reference to the center line of the first runner port 2, the length of the projection of the first half opening 6 on the center line of the first runner port 2 is consistent with the length of the projection of the connecting area of the first runner port 2 and the housing body 1 on the center line of the first runner port 2; with respect to the second half opening 7 of the second flow path plate 5, with reference to the center line of the second flow path opening 3, the length of the projection of the second half opening 7 on the center line of the second flow path opening 3 matches the length of the projection of the connecting area of the second flow path opening 3 and the housing body 1 on the center line of the second flow path opening 3.

In some embodiments, the tail end of the first flow channel plate 4 is located on a radius connecting a tangent point of the center line of the second flow channel opening 3 and the shell body with the center of the shell body, and the tail end of the second flow channel plate 5 is located on a radius connecting a tangent point of the center line of the first flow channel opening 2 and the shell body with the center of the shell body.

In the specific implementation process, the head of the first flow channel plate 4 is provided with the first half opening 6, and the head of the second flow channel plate 5 is provided with the second half opening 7, so that when water flows through the inner side of the first flow channel plate 4 and enters the second flow channel, part of the water flows can flow into the first flow channel opening 2 through the first half opening 6, and when the water flows through the inner side of the second flow channel plate 5 and enters the first flow channel, part of the water flows can flow into the second flow channel opening 3 through the second half opening 7, so that water flowing in through the first flow channel opening 2 and the second flow channel opening 3 directly moves in the radial direction is provided, and the water outlet efficiency of the first flow channel opening 2 and the second flow channel opening 3 is ensured.

Further, regarding the first half opening 6 of the first flow channel plate 4, with the center line of the first flow channel opening 2 as a reference, the length of the projection of the first half opening 6 on the center line of the first flow channel opening 2 is consistent with the length of the projection of the connecting area of the first flow channel opening 2 and the housing body 1 on the center line of the first flow channel opening 2; regarding the second half opening 7 of the second flow channel plate 5, with the center line of the second flow channel opening 3 as a reference, the length of the projection of the second half opening 7 on the center line of the second flow channel opening 3 is consistent with the length of the projection of the connecting area of the second flow channel opening 3 and the housing main body 1 on the center line of the second flow channel opening 3, the tail end of the first flow channel plate 4 is located on the radius connecting the tangent point of the center line of the second flow channel opening 3 and the housing main body with the center of the housing main body, and the tail end of the second flow channel plate 5 is located on the radius connecting the tangent point of the center line of the first flow channel opening 2 and the housing main body with the center of the housing main body.

Thus, in effect, the trailing end of the second flow field plate 5 covers the first half-opening 6 and the trailing end of the first flow field plate 4 covers the second half-opening 7, so that the flow entering the first flow field port 2 through the first half-opening 6 is in effect part of the flow that has entered the second flow field port, and the flow entering the second flow field port 3 through the second half-opening 7 is in effect part of the flow that has entered the first flow field port.

However, since the first half-opening 6 and the second half-opening 7 actually allow only a part of the water flow to pass through, most of the water flow still flows into the second flow channel and the first flow channel through the first flow channel plate 4 and the second flow channel plate 5 on the side which is not opened, so that under the condition that sufficient water flow is ensured in the first flow channel opening 2, a large amount of water flow still enters the first flow channel and the second flow channel to improve the flow rate, and the water flow of the water outlet can be ensured while the water outlet efficiency per unit time is ensured.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above embodiments are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes and modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.

Description of the reference numerals:

casing main body-1

First flow passage opening-2

Second runner opening-3

First flow field plate-4

Second flow field plate-5

First half opening-6

Second half-opening-7.

Claims (8)

1. A volute for a dual-opening centrifugal pump casing, comprising: the water inlet comprises a shell body, a first flow channel opening, a second flow channel opening, a first flow channel plate, a second flow channel plate and a water inlet;

the casing body is discoid, the water inlet set up in the positive central point of casing puts, the central line of first flow channel mouth with the central line of second flow channel mouth respectively with the casing body is tangent, first flow channel mouth with the second flow channel mouth is central symmetry about the center of casing body, first flow channel board with the second flow channel board all set up in the inside of casing body, first flow channel board with the second flow channel board is the arc, first flow channel board connect first flow channel mouth with the inboard of the junction of casing body, the second flow channel board is connected second flow channel mouth with the inboard of the junction of casing body, first flow channel board set up in the inside rear side of casing body, the second flow channel board set up in the inside front side of casing body, first flow channel board with the second flow channel board about the center of casing body is central symmetry.

2. The volute of claim 1 wherein, for a junction of the first flow opening and the housing body, relative to a centerline of the first flow opening, the first flow plate is connected to a tangent point that connects the first flow opening to an outside of the housing body, and the first flow plate is not connected to a tangent point that connects the first flow opening to an inside of the housing body; for the joint of the second runner port and the shell body, relative to the central line of the second runner port, the part which is connected with the tangent point is the outer side of the second runner plate which is connected with the second runner port and the shell body, and the part which is not connected with the tangent point is the inner side of the second runner plate which is connected with the second runner port and the shell body.

3. The volute of claim 2 wherein the first and second flow openings each include an annular protrusion at the location where the first and second flow openings are connected to the housing body, the annular protrusion limiting the flow rate at the initial location of the first and second flow openings.

4. The volute of a dual-opening centrifugal pump casing of claim 3, wherein said intake includes an intake gasket and an intake flange, said intake flange being attached to an exterior of said casing body, said intake gasket being padded at a junction of said intake flange and said casing body.

5. The volute of a dual-opening centrifugal pump casing of claim 4, wherein the back side of the casing body is provided with a connection port penetrating through the fixing plate and a fixing plate for providing a space for a rotation shaft of a motor to pass through, the fixing plate being used for fixing the casing body to an associated motor casing.

6. The volute of a dual-opening centrifugal pump casing of claim 1, wherein the first flow field plate head portion defines a first half-opening located proximate an interior front side of the casing body, and the second flow field plate head portion defines a second half-opening located proximate an interior rear side of the casing body.

7. The volute of claim 6, wherein, for the first half of the first flow field plate, with reference to a center line of the first flow field opening, a length of a projection of the first half of the first flow field opening onto the center line of the first flow field opening is identical to a length of a projection of a connecting area of the first flow field opening and the housing body onto the center line of the first flow field opening; with respect to the second half opening of the second flow passage plate, with reference to the center line of the second flow passage opening, the length of the projection of the second half opening on the center line of the second flow passage opening coincides with the length of the projection of the connecting area of the second flow passage opening and the housing main body on the center line of the second flow passage opening.

8. The volute of claim 7, wherein the trailing end of the first flow field plate is located on a radius where the tangent point of the second flow field port to the housing body is connected to the center of the housing body, and the trailing end of the second flow field plate is located on a radius where the tangent point of the first flow field port to the housing body is connected to the center of the housing body.

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