CN115182901A - A double-layer casing flow channel diversion support structure - Google Patents

Abstract

The invention discloses a double-layer casing flow channel diversion support structure, comprising a diversion support structure body; the diversion support structure body is cylindrical, the inlet end of the diversion support structure body and an inner casing The inner casing is connected to the pump outlet of the pump unit through the diversion support structure body; the diversion support structure body is evenly distributed with a number of lugs in the circumferential direction, and the diversion support structure body passes through the support structure. The ear is connected with the outer sleeve; the support ear is provided with a diversion device, and the diversion device is located between the inner sleeve and the outer sleeve; the diversion direction of the diversion device is the direction of the water flow , using this scheme, the outer casing and the inner casing are connected through the diversion support structure, so as to form a stable support structure, improve the structural stability of the inner casing, and through the diversion effect of the diversion device, The flow state of the pump inlet flow field is improved, and the hydraulic performance of the pump is improved.

Description

A double-layer casing flow channel diversion support structure

technical field

The invention relates to the technical field of multipurpose modular small reactors, in particular to a double-layer casing flow channel diversion support structure.

Background technique

The reactor coolant pump and other pump units used in the multi-purpose modular small reactor and other fields are installed in the double-layer casing flow channel, that is, the pump hydraulic structure is completely or partially placed in the system pipeline, and the pipeline is used as the pump casing or a part of the pump casing. The annular cavity between the layer casing and the inner casing is connected with the pump inlet as the pump inlet flow channel, and the inner layer casing is connected with the pump outlet as the pump outlet flow channel. This arrangement has a compact structure, which is beneficial to the miniaturization of the system and equipment.

However, in this arrangement, the flow field at the pump inlet is turbulent because the flow channel of the double-layer casing is not a diversion structure specially designed according to the hydraulic performance of the pump; and the support structure of the inner casing needs to be connected to the outer casing. It will further disturb the inlet flow field of the pump and reduce the hydraulic performance of the pump. In order to reduce the disturbance of the support structure to the flow field, the volume of the support structure should be reduced, which is detrimental to the stability of the inner casing.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is that the hydraulic performance of the pump installed in the double-layer casing flow channel is low due to structural limitations in the field of multi-purpose modular small-scale reactors and the like, and the supporting strength of the inner casing is small. The purpose is to provide a dual-layer casing. The layer casing flow channel diversion support structure adopts this scheme to improve the flow field characteristics of the pump inlet, improve the structural strength of the inner casing support, and play a diversion role for the fluid after the pump outlet.

The present invention is achieved through the following technical solutions:

A double-layer casing flow channel diversion support structure, comprising a diversion support structure body;

The main body of the diversion support structure is cylindrical, the inlet end of the main body of the diversion support structure is connected to the outlet end of the inner sleeve, and the inner sleeve passes through the main body of the diversion support structure and the pump of the pump unit. export connection;

The diversion support structure body is evenly distributed with a plurality of lugs in the circumferential direction, and the diversion support structure body is connected with the outer sleeve through the lugs;

The support lug is provided with a flow guiding device, and the flow guiding device is located between the inner sleeve and the outer sleeve; the flow guiding direction of the flow guiding device is the direction of the water flow.

Compared with the problems in the prior art, such as the multi-purpose modular small-scale reactor and other fields, the hydraulic performance of the pump installed in the double-layer casing flow channel is low due to structural limitations, and the supporting strength of the inner casing is small. A double-layer casing flow channel diversion support structure, using this scheme, the outer casing and the inner casing are connected through the diversion support structure, so as to form a stable supporting structure and improve the structural stability of the inner casing , and through the diversion effect of the diversion device, the flow state of the pump inlet flow field is improved, and the hydraulic performance of the pump is improved; A diversion support structure body is arranged on the casing and the inner casing, the diversion supporting structure body is cylindrical, and its inlet end, that is, the lower end, is fixedly connected with the outlet end of the inner casing, and communicates with the inner casing of the inner casing , and the upper end of the main body of the diversion support structure cooperates with the pump unit, so that the pump outlet channel is formed inside the main body of the diversion support structure; in the circumferential direction of the main body of the diversion support structure, there are a number of evenly distributed lugs extending outwards. The body of the flow support structure is fixedly connected with the outer casing through the lugs, so that the inner casing and the outer casing are connected, and the structural stability of the inner casing is improved. At this time, the pump inlet guide vane and the guide support structure In cooperation, a pump inlet guide area is formed between the outer casing and the inner casing, and outside the guide support structure.

As mentioned above, further, since the position where the double-layer casing is connected to the pump unit is an elbow, the influent water flow between the outer casing and the inner casing is turbulent, thereby disturbing the inlet flow field of the pump and reducing the The hydraulic performance of the pump, therefore, this solution is provided with a diversion device on the lug, and the diversion direction of the diversion device is the same as the direction of the water flow, which facilitates the diversion of the water flow between the outer casing and the inner casing, thereby The characteristics of the pump inlet flow field are improved, and the hydraulic performance of the pump is improved.

Further optimization, the diversion device is a diversion cone, the bottom of the diversion cone is connected to the side of the lug away from the pump unit, and the top of the diversion cone extends away from the lug; Since the diversion device is arranged in the interlayer between the outer casing and the inner casing, in order to adapt to the assembly size between the outer casing and the inner casing, a diversion cone is selected in this scheme, and the diversion cone is set in the The top of the lug is located on and below the lug, and the top of the lug extends downward, which can reduce the local disturbance caused by the lug to the water flow while guiding the incoming water.

Further optimization, the diversion cone is in the shape of a Mitsubishi column, and the width direction of the diversion cone is arranged along the length direction of the lug. Its width direction is the same as the length direction of the lug. By widening the diversion cone, the diversion effect on the water flow can be improved, and the influence of the lug on the water flow can be reduced; it can preferably be along the radial direction of the main body of the diversion support structure. The direction is set; the diversion cone is inserted between the outer casing and the inner casing, and a certain assembly gap is left for easy disassembly.

Further optimization, the width of the bottom side of the diversion cone is equal to the width of the lug; in order to prevent the lug from causing turbulence to the water flow, in this solution, since the width of the bottom of the diversion cone is smaller than the width of the lug, it will affect the water flow. If the width of the bottom of the guide cone is larger than the width of the lug, eddy current will be formed on the back, which is not conducive to the guide. Therefore, the width of the side of the bottom of the guide cone and the width of the lug need to be equal.

Further optimization, the top of the guide cone is a smooth curved surface; it is used to improve the guide effect.

Further optimization, the guide cone and the support lug are integrally formed; for improving the connection strength of the guide cone, the connection method may also be a fixed connection method such as welding.

Further optimization, the side of the lug close to the pump unit is a plane structure; by setting the upper side of the lug to be a plane, it is convenient to cooperate with the pump unit.

Further optimization, the guide support structure body and the inner sleeve are arranged coaxially.

Further optimization, the inlet end of the guide support structure body is provided with an inner cylinder, the inner diameter of the inner cylinder is adapted to the inner diameter of the inner sleeve, the end of the inner cylinder and the inner sleeve are The pipe ends are welded; in order to improve the stability of the diversion support structure and avoid vibration, in this scheme, the inlet end of the diversion support structure body is provided with an inner cylinder connected to the inner sleeve. The inner diameter and wall thickness of the inner cylinder are Both are the same as the inner casing, and are connected by welding, so as to improve the connection strength; the inner cylinder and the inner pipe together form the fluid channel after the pump outlet, so as to collect and guide the fluid leaving the pump.

Further optimization, the outer casing is provided with a stepped hole, and the lug extends into the stepped hole of the stepped hole and is connected to the stepped by bolts; in order to realize the detachment of the main body of the guide support structure, this In the solution, through holes are provided at the ends of the lugs, and threaded holes are provided on the steps of the stepped holes. At this time, the detachable connection between the lugs and the outer sleeve can be realized by bolts.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. The present invention provides a double-layer casing flow channel diversion support structure, which guides the fluid behind the pump outlet through the diversion device and the inner casing, and improves the flow state of the pump inlet flow field, The hydraulic performance of the pump is improved; and the structure can improve the strength of the support structure of the inner casing and improve the stability of the inner casing.

2. The present invention provides a double-layer casing flow channel diversion support structure. By changing the structural size of the double-layer casing flow channel inner layer casing support, the support structure is redesigned according to a structure that is conducive to the stability of the flow field. , and improve the strength of the support structure.

3. The present invention provides a double-layer casing flow channel diversion support structure, which is suitable for the diversion and support structure of the double-layer casing flow channel in the fields of multi-purpose modular small reactors, etc., so as to solve the problem of double-layer casing flow. It can improve the hydraulic performance of the pump used in the double casing flow channel and improve the structural stability of the inner casing.

Description of drawings

In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings required in the embodiments will be briefly introduced below. It should be understood that the following drawings only illustrate some embodiments of the present invention, Therefore, it should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort. In the attached image:

1 is a schematic structural diagram of an overall layout provided by the present invention;

Fig. 2 is a partial schematic diagram A-A provided by the present invention;

3 is a schematic structural diagram of a diversion support structure body provided by the present invention;

FIG. 4 is a sectional view B-B of the guide cone provided by the present invention.

The marks in the attached drawings and the corresponding parts names:

1- Double-layer casing, 2- Pump unit, 3- Outer casing, 4- Inner casing, 5- Diversion support structure body, 51- Support lug, 52- Diversion device, 53- Inner cylinder, 6- Bolts.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and the accompanying drawings. as a limitation of the present invention.

Example

As shown in FIG. 1 to FIG. 4 , this embodiment provides a double-layer casing flow channel diversion support structure, including a diversion support structure body 5;

The diversion support structure body 5 is cylindrical, the inlet end of the diversion support structure body 5 is connected to the outlet end of the inner sleeve 4 , and the inner sleeve 4 passes through the diversion support structure body 5 Connected with the pump outlet of the pump unit 2;

A plurality of lugs 51 are evenly distributed on the diversion support structure body 5 in the circumferential direction, and the diversion support structure body 5 is connected to the outer sleeve 3 through the lugs 51;

The support lug 51 is provided with a flow guide device 52, and the flow guide device 52 is located between the inner sleeve 4 and the outer sleeve 3; the flow guide direction of the flow guide device 52 is the direction of the water flow.

Compared with the problems in the prior art, the hydraulic performance of the pump installed in the flow channel of the double-layer casing 1 is relatively low and the supporting strength of the inner casing 4 is relatively small due to structural limitations in the fields of multi-purpose modular small-scale reactors. A double-layer casing 1 flow channel diversion support structure is adopted. By adopting this scheme, the outer casing 3 and the inner casing 4 are connected through the diversion support structure, so as to form a stable supporting structure and improve the inner casing. The structural stability of the pipe 4 and the diversion effect of the diversion device 52 improve the flow state of the pump inlet flow field and improve the hydraulic performance of the pump; On the flange surface of the casing 1, a diversion support structure body 5 is arranged on the outer casing 3 and the inner casing 4. The diversion supporting structure body 5 is cylindrical, and its inlet end, that is, the lower end and the inner casing The outlet end of 4 is fixedly connected and communicated with the inner casing 4, and the upper end of the diversion support structure body 5 cooperates with the pump unit 2, so that the inner part of the diversion support structure body 5 constitutes a pump outlet channel; The support structure body 5 has a number of evenly distributed lugs 51 extending outward in the circumferential direction, and the diversion support structure body 5 is fixedly connected with the outer sleeve 3 through the lugs 51, so that the inner sleeve 4 and the outer sleeve 3 are fixedly connected. The pipes 3 are connected to improve the structural stability of the inner casing 4. At this time, the pump inlet guide vane and the diversion support structure cooperate to make the outer casing 3 and the inner casing 4 and the outer casing of the diversion support structure. Constitute the pump inlet diversion area.

As mentioned above, further, since the position where the double-layer casing 1 is connected to the pump unit 2 is an elbow, the water flow between the outer casing 3 and the inner casing 4 is disturbed, thereby disturbing the inlet of the pump Therefore, in this scheme, a diversion device 52 is provided on the lug 51, and the diversion direction of the diversion device 52 is the same as the water flow direction, which is convenient for the outer casing 3 and the inner casing 4. The water flow between them is diverted, thereby improving the characteristics of the pump inlet flow field and improving the hydraulic performance of the pump.

Referring to FIG. 3 , in this embodiment, as a specific implementation manner to reduce the influence of the support lugs 51 on the water flow, it is set as follows: the flow guide device 52 is a flow guide cone, and the bottom of the flow guide cone and the The said lug 51 is connected away from the side of the pump unit 2, and the top of the guide cone extends in the direction away from the said lug 51; In the interlayer between, in order to adapt to the assembly size between the outer casing 3 and the inner casing 4, this scheme selects a diversion cone, which is arranged on the lug 51, and is located below the lug 51, and its top Extending downward can reduce the local disturbance caused by the lugs 51 to the water flow while guiding the incoming water.

The above scheme, further, please refer to FIG. 3 and FIG. 4 , as a specific embodiment for reducing the turbulence caused by the lug 51 to the water flow, the configuration is as follows: the diversion cone is in the shape of a Mitsubishi column, and the diversion cone The width direction is arranged along the length direction of the lug 51; in this solution, the diversion cone is in the shape of a Mitsubishi column, and its width direction is the same as the length direction of the lug 51. By widening the diversion cone, the diversion effect on the water flow can be improved , and reduce the influence of the lugs 51 on the water flow; preferably, they are all arranged along the radial direction of the diversion support structure body 5; wherein the diversion cone is inserted between the outer casing 3 and the inner casing 4. , and leave a certain assembly gap for easy disassembly.

Please continue to refer to FIG. 3. In the above solution, if the width of the bottom of the guide cone is smaller than the width of the lug 51, it will form resistance to the water flow, and if the width of the bottom of the guide cone is greater than the width of the lug 51, it will form on the back. Eddy current, these two methods are not conducive to diversion. Therefore, in this embodiment, the width of the bottom side of the diversion cone is set to be equal to the width of the lug 51; it is used to prevent the lug 51 from causing turbulence to the water flow. Phenomenon.

Referring to FIG. 4 , as a specific implementation manner to improve the diversion effect, it is set as follows: the top of the diversion cone is a smooth curved surface.

As a specific embodiment for improving the connection strength of the guide cone, it is set as follows: the guide cone and the support lug 51 are integrally formed; the connection method may also be a fixed connection method such as welding, which will not be repeated here.

In this embodiment, the side of the lug 51 close to the pump unit 2 is a plane structure; by setting the upper side of the lug 51 to be a plane, it is convenient to cooperate with the pump unit 2 .

In this embodiment, the guide support structure body 5 and the inner sleeve 4 are coaxially arranged.

Please refer to FIG. 1 and FIG. 3 , as a specific embodiment for improving the stability of the diversion support structure and avoiding vibration, it is set as follows: the inlet end of the main body 5 of the diversion support structure is provided with an inner cylinder 53, The inner diameter of the cylinder 53 is adapted to the inner diameter of the inner sleeve 4, and the end of the inner cylinder 53 is welded to the end of the inner sleeve 4; The inlet end is provided with an inner tube 53 connected to the inner sleeve 4. The inner diameter and wall thickness of the inner tube 53 are the same as those of the inner sleeve 4, and are connected by welding, thereby improving the connection strength; the inner tube 53 and the inner pipeline Together, they form the fluid channel behind the pump outlet, so as to collect and guide the fluid leaving the pump.

As a specific embodiment for realizing the detachment of the main body 5 of the guide support structure, it is set as follows: the outer sleeve 3 is provided with a stepped hole, and the support lug 51 extends into the step of the stepped hole, And through the bolt 6 and the ladder connection; in this solution, the end of the lug 51 has a through hole, and the step of the stepped hole has a threaded hole, at this time, the bolt 6 can be used to realize the lug 51 and the outer Removable connection of layer sleeves 3.

Specific working principle: When the equipment is installed, the inner casing 4 is connected and fixed to the outer casing 3 through the diversion support structure body 5, and the manufacturing accuracy of the diversion support structure body 5 and the inner casing 4 is ensured to be centered. The pump unit 2 body is installed on the upper flange surface of the double-layer casing 1 through the main bolt 6, and the pump inlet guide vane cooperates with the guide support structure body 5 to form the pump inlet guide area. When the pump is running, the fluid flows from the interlayer between the outer casing 3 and the inner casing 4 to the inlet of the pump, and after being guided by the diversion cone on the main body 5 of the diversion support structure, a relatively stable fluid enters the pump to obtain The energy transmitted by the pump then enters the outlet channel formed by the main body 5 of the diversion support structure and the inner casing 4 . In the above structure, the outer casing 3 and the inner casing 4 are connected through the diversion support structure, thereby forming a stable support structure, improving the structural stability of the inner casing 4, and the diversion through the diversion device 52 It improves the flow state of the pump inlet flow field and improves the hydraulic performance of the pump.

The specific embodiments described above further describe the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A double-layer casing flow channel diversion support structure, characterized in that, comprising a diversion support structure body (5); The diversion support structure body (5) is cylindrical, the inlet end of the diversion support structure body (5) is connected with the outlet end of the inner sleeve (4), and the inner sleeve (4) passes through The diversion support structure body (5) communicates with the pump outlet of the pump unit (2); The diversion support structure body (5) is uniformly distributed with a plurality of lugs (51) in the circumferential direction, and the diversion support structure body (5) is connected with the outer sleeve (3) through the lugs (51); A flow guiding device (52) is provided on the lug (51), and the flow guiding device (52) is located between the inner sleeve (4) and the outer sleeve (3); the flow guiding device ( The diversion direction of 52) is the direction of the water flow. 2. A double-layer casing flow channel flow guide support structure according to claim 1, characterized in that, the flow guide device (52) is a flow guide cone, and the bottom of the flow guide cone and the branch The ear (51) is connected to the side away from the pump unit (2), and the top of the guide cone extends in a direction away from the support ear (51). 3. A double-layer casing flow channel guide support structure according to claim 2, characterized in that the guide cone is in the shape of a Mitsubishi column, and the width direction of the guide cone is along the lug (51) Length direction setting. 4 . The double-layer casing flow channel guide support structure according to claim 3 , wherein the width of the bottom side surface of the guide cone is equal to the width of the lug ( 51 ). 5 . 5 . The double-layer casing flow channel diversion support structure according to claim 3 , wherein the top of the diversion cone is a smooth curved surface. 6 . 6 . The double-layer casing flow channel flow guide support structure according to claim 2 , wherein the flow guide cone and the support lug ( 51 ) are integrally formed. 7 . 7 . The double-layer casing flow channel diversion support structure according to claim 2 , wherein the side of the lug ( 51 ) close to the pump unit ( 2 ) is a plane structure. 8 . 8 . The double-layer casing flow channel diversion support structure according to claim 1 , wherein the diversion support structure body ( 5 ) and the inner casing ( 4 ) are coaxially arranged. 9 . 9 . The double-layer casing flow channel diversion support structure according to claim 1 , wherein the inlet end of the diversion support structure body ( 5 ) is provided with an inner cylinder ( 53 ), and the inner The inner diameter of the barrel (53) is adapted to the inner diameter of the inner sleeve (4), and the end of the inner barrel (53) and the end of the inner sleeve (4) are welded. 10. The double-layer casing flow channel diversion support structure according to claim 1, wherein the outer casing (3) is provided with a stepped hole, and the lug (51) extends into to the step of the step hole, and connect the step with the bolt (6).

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