Flow regulation structure and pump apparatus

Abstract

The utility model provides a flow adjusting structure and pump equipment, and relates to the technical field of pump equipment, the flow adjusting structure comprises a pump shell, a water outlet connecting pipe and a flow control piece, the pump shell comprises a pump body volute chamber used for containing an impeller; the water outlet connecting pipe is arranged on the pump shell and comprises a water outlet channel, and the water outlet channel communicates with the pump body volute chamber in the tangential direction of the pump body volute chamber; the flow control piece is detachably inserted into the water outlet channel, a through hole is formed in the flow control piece, and the minimum hole diameter of the through hole is smaller than that of the water outlet channel. According to the centrifugal pump, the detachable flow control piece is arranged in the water outlet channel, accurate control over fluid flow can be achieved through the through hole in the flow control piece, the problem of performance fluctuation of the centrifugal pump caused by hole diameter machining errors is solved, the flow characteristic of the pump is made to be highly matched with the design requirement, and the service life of the pump is prolonged. And the hydraulic performance stability of pump equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of pump equipment technology, and in particular to a flow regulation structure and a pump equipment. Background Technology

[0002] In the design and manufacture of small-flow centrifugal pumps, the throat size between the pressure chamber and the outlet connection plays a crucial role in the pump's hydraulic performance. In existing designs, volute centrifugal pumps achieve the connection between the pressure chamber and the outlet connection through direct casting, resulting in a relatively large throat size with loose dimensional tolerances. However, this cast throat structure is insufficient for low-flow operation. For small-flow centrifugal pumps, the throat size between the outlet connection and the pressure chamber is smaller, and flow control is typically achieved by machining a circular hole of the appropriate diameter.

[0003] However, in small-flow centrifugal pumps, these circular holes are small in size and have a certain depth from the outlet flange face of the outlet pipe, making deep hole machining difficult and resulting in challenges in ensuring dimensional and positional tolerances. Especially for smaller throat diameters, problems such as out-of-tolerance diameters, positional misalignments, and misalignment of the circular holes with the pressure chamber due to machining tilt frequently occur. This leads to frequent occurrences of unstable head and lower-than-theoretical efficiency in small-flow centrifugal pumps. When there is a significant deviation between the measured and theoretical performance of a small-flow centrifugal pump, the pump body repair rate increases, severely impacting the first-pass yield and on-time delivery rate.

[0004] Therefore, reducing the performance fluctuations of centrifugal pumps caused by orifice diameter machining issues to improve the hydraulic performance stability of pump equipment has become an urgent technical problem to be solved. Furthermore, a centrifugal pump typically has only one throat, which can only meet one hydraulic performance requirement and cannot be adapted to different hydraulic characteristics. To meet different hydraulic performance needs, it is necessary to machine centrifugal pumps with different throat sizes and replace them with centrifugal pumps with different throat sizes to achieve control of different flow characteristics, which is complex. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a flow regulation structure and a pump device to solve at least one of the above-mentioned technical problems.

[0006] The above-mentioned objective of this utility model can be achieved by the following technical solution: this utility model provides a flow regulation structure, including:

[0007] A pump casing, the pump casing including a pump body volute for accommodating an impeller;

[0008] A water outlet connector is provided on the pump casing. The water outlet connector includes a water outlet channel that connects to the pump body volute along the tangential direction of the pump body volute.

[0009] A flow control component is detachably inserted into the water outlet channel. The flow control component has a through hole that penetrates the flow control component and communicates with the water outlet channel. The minimum diameter of the through hole is smaller than the minimum diameter of the water outlet channel.

[0010] In a preferred embodiment of the present invention, the through hole includes a straight hole section extending along the axis of the flow control element, and the diameter of the straight hole section constitutes the minimum diameter of the through hole.

[0011] In a preferred embodiment of this utility model, the water outlet channel includes an upper channel and a lower channel, the lower channel connects the upper channel and the pump body volute, the size of the lower channel is not greater than the size of the upper channel, and the flow control component is disposed in the upper channel.

[0012] In a preferred embodiment of the present invention, the through hole further includes a first conical hole section extending from the straight hole section toward the direction away from the pump body volute, wherein the diameter of the first conical hole section gradually increases along the direction away from the straight hole section; and / or, the through hole further includes a second conical hole section extending from the straight hole section toward the pump body volute, wherein the diameter of the second conical hole section gradually increases along the direction away from the straight hole section.

[0013] In a preferred embodiment of the present invention, along the water flow direction, the outlet angle of the first conical section is 30°±10°; and / or, the inlet angle of the second conical section is 60°±10°.

[0014] In a preferred embodiment of this utility model, the diameter of the straight hole section is Φ5mm to Φ13.5mm; and / or, the diameter of the lower channel is Φ15mm to Φ25mm.

[0015] In a preferred embodiment of this utility model, the outer wall of the flow control component is provided with an external thread structure, and the inner wall of the water outlet pipe is provided with an internal thread structure. The flow control component is threadedly connected to the internal thread structure through the external thread structure.

[0016] In a preferred embodiment of the present invention, the flow control component includes a screw plug, and the through hole extends through the screw plug along its axis.

[0017] In a preferred embodiment of the present invention, the end of the screw plug away from the pump body volute is provided with a wrench structure, the wrench structure including a wrench groove provided on the screw plug.

[0018] In a preferred embodiment of the present invention, a limiting shoulder is provided on the inner wall of the water outlet pipe, the flow control component is disposed on the limiting shoulder, and the flow adjustment structure further includes a breaking structure for connecting the flow control component and the inner wall of the water outlet pipe, wherein the flow control component can be detached by breaking the breaking structure.

[0019] In a preferred embodiment of the present invention, the breaking structure includes a plurality of welded portions for connecting the flow control component and the inner wall of the water outlet pipe, the plurality of welded portions being spaced apart and arranged in a ring.

[0020] This utility model also provides a pump device, including the aforementioned flow regulating structure.

[0021] The technical solution of this utility model has the following significant beneficial effects:

[0022] The flow regulation structure described in this utility model achieves precise control of fluid flow rate by incorporating a detachable flow control component in the water outlet channel and utilizing the through-holes on the component. Because the flow control component is detachable, users can replace it with flow control components of different through-hole diameters according to actual needs, thereby achieving flexible switching between various flow characteristics and meeting the usage requirements under different operating conditions. Furthermore, the detachable flow control component not only facilitates installation and replacement but also allows for adjustment or maintenance of flow characteristics during pump operation, improving the maintenance convenience and service life of the pump equipment. Especially when applied to small-flow centrifugal pumps, the through-holes on the flow control component are easier to machine, significantly reducing processing difficulty and providing better dimensional accuracy. This results in a more stable head and efficiency close to the theoretical value for small-flow centrifugal pumps, ensuring a high first-pass yield and on-time delivery rate. This utility model solves the problem of centrifugal pump performance fluctuations caused by orifice diameter machining errors by incorporating a flow control component, ensuring a high degree of match between the pump's flow characteristics and design requirements, and improving the hydraulic performance stability of the pump equipment. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0025] Figure 1 This is a cross-sectional view of one embodiment of the flow regulation structure described in this utility model;

[0026] Figure 2 for Figure 1 A cross-sectional schematic diagram of one embodiment of the flow control device shown in the figure;

[0027] Figure 3 This is a cross-sectional view of another embodiment of the flow regulation structure described in this utility model;

[0028] Figure 4 for Figure 3 A cross-sectional schematic diagram of one embodiment of the flow control device shown in the figure;

[0029] Figure 5 This is a cross-sectional view of one embodiment of the demolition structure described in this utility model;

[0030] Figure 6 This is a front view schematic diagram of one embodiment of the flow regulation structure described in this utility model;

[0031] Figure 7 This is a three-dimensional structural cross-sectional view of one embodiment of the water outlet pipe of this utility model;

[0032] Figure 8 This is a three-dimensional structural diagram of one embodiment of the flow regulation structure described in this utility model;

[0033] Figure 9 This is a side sectional view of one embodiment of the flow regulation structure described in this utility model;

[0034] Figure 10 for Figure 9 Schematic diagram of section AA;

[0035] Figure 11 for Figure 9 Schematic diagram of the BB section.

[0036] The reference numerals in the above figures are as follows:

[0037] 10. Pump body volute;

[0038] 20. Water outlet channel; 21. Upper channel; 22. Lower channel;

[0039] 100. Pump casing;

[0040] 200. Outlet pipe; 210. Flange; 220. Limiting shoulder;

[0041] 300. Flow control component; 310. Screw plug; 311. Straight hole section; 312. First tapered hole section; 313. Second tapered hole section; 320. Tightening mechanism;

[0042] 400. Demolition structure; 410. Welded section. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0044] Implementation Method 1

[0045] Please refer to the following: Figures 1 to 11 As shown, an embodiment of this utility model provides a flow regulation structure, which includes a pump casing 100, a water outlet pipe 200, and a flow control component 300. The pump casing 100 includes a pump body volute 10 for accommodating an impeller. The water outlet pipe 200 is disposed on the pump casing 100 and includes a water outlet channel 20. The water outlet channel 20 communicates with the pump body volute 10 along the tangential direction. The flow control component 300 is detachably inserted into the water outlet channel 20. The flow control component 300 has a through hole that penetrates the flow control component 300 and communicates with the water outlet channel 20. The minimum diameter of the through hole is smaller than the minimum diameter of the water outlet channel 20.

[0046] Overall, this flow regulation structure achieves precise control of fluid flow rate by installing a detachable flow control component 300 in the water outlet channel 20 and utilizing the through holes on the flow control component 300. Because the flow control component 300 is detachable, users can replace it with flow control components 300 of different through hole diameters according to actual needs, thereby achieving flexible switching between various flow characteristics and meeting the usage requirements under different operating conditions.

[0047] Furthermore, the detachable flow control component 300 not only facilitates installation and replacement, but also allows for adjustment or maintenance of flow characteristics during pump operation, thereby improving the maintenance convenience and service life of the pump equipment.

[0048] Especially when applied to small flow centrifugal pumps, the through hole of the flow control component 300 is easier to process, significantly reducing the processing difficulty and providing better dimensional accuracy. This makes the head of the small flow centrifugal pump more stable and the efficiency closer to the theoretical value, ensuring the first-time pass rate and on-time delivery rate of the small flow centrifugal pump.

[0049] Because existing small-flow centrifugal pumps have small throat sizes and large machining depths, deep hole machining is difficult and dimensional and positional tolerances are hard to guarantee, which in turn affects the consistency of pump performance.

[0050] This invention can enlarge the channel size between the pump body volute 10 and the outlet pipe 200 (e.g., to Φ24), significantly reducing processing difficulty and minimizing problems such as out-of-tolerance hole diameter, positional offset, and non-tangentiality between the hole and the pump body flow channel due to inclined hole machining. By incorporating a flow control component 300, this invention solves the problem of centrifugal pump performance fluctuations caused by hole diameter machining errors, ensuring a high degree of match between the pump's flow characteristics and design requirements, and improving the hydraulic performance stability of the pump equipment.

[0051] In one feasible embodiment of this utility model, the outer wall of the flow control component 300 is provided with an external thread structure, and the inner wall of the water outlet pipe 200 is provided with an internal thread structure. The flow control component 300 is threadedly connected to the internal thread structure through the external thread structure.

[0052] By providing an external thread structure on the outer wall of the flow control component 300 and an internal thread structure on the inner wall of the outlet pipe 200, the flow control component 300 and the outlet pipe 200 can be threadedly connected. This not only ensures the stable installation of the flow control component 300 but also provides a convenient way to disassemble and replace it, greatly improving maintenance convenience. Furthermore, the threaded connection effectively prevents fluid leakage and ensures sealing performance.

[0053] In addition, compared with other fixing methods (such as snap-fit ​​or adhesive), threaded connection is more lenient in terms of the precision requirements of parts machining, which reduces manufacturing difficulty and cost. At the same time, it is also convenient to quickly replace different specifications of flow control components 300 according to actual needs, further enhancing the flexibility and adaptability of flow control components 300.

[0054] Designers can adjust the specific shape and structure of the flow control component 300 according to usage requirements, and no specific limitations are imposed here. Preferably, the flow control component 300 includes a screw plug 310, and a through hole extends through the screw plug 310 along its axis.

[0055] By setting the flow control element 300 in the form of a plug 310 and making the through hole pass through the plug 310 along its axis, not only is the processing technology simplified, but the positional accuracy and coaxiality of the through hole are also ensured, thereby improving the stability of fluid flow.

[0056] Furthermore, the 310 screw plug is easier to standardize and mass-produce, significantly reducing production costs and improving practicality. In addition, the axially arranged through-hole reduces fluid resistance and facilitates smoother flow, effectively reducing energy loss and improving the efficiency of pump equipment.

[0057] In this embodiment of the invention, a wrench structure 320 is provided at the end of the screw plug 310 away from the pump body volute 10. By providing the wrench structure 320 at the end of the screw plug 310 away from the pump body volute 10, the ease of installation and removal of the screw plug 310 is significantly improved.

[0058] Specifically, the wrench mechanism 320 provides the operator with a reliable point of leverage, making it easier to control the force when installing or replacing the screw plug 310, thus avoiding damage to parts caused by improper external force.

[0059] In one specific embodiment, the wrench structure 320 includes a wrench groove provided on the screw plug 310. By providing a wrench groove on the screw plug 310 as the wrench structure 320, not only is the processing simple, but the force exerted during operation can also be effectively increased, making it more convenient and stable for users to install or remove the screw plug 310. Furthermore, the wrench groove does not require additional parts, simplifying the overall design and reducing production complexity.

[0060] Designers can adjust the specific shape and structure of the wrench groove according to the needs of use, such as cross-shaped wrench groove, straight wrench groove, hexagonal wrench groove, etc., without making specific restrictions here.

[0061] Of course, in other feasible embodiments, designers may adjust the specific structure of the lever-tightening structure 320 according to the needs of use, and no specific restrictions are imposed here.

[0062] For example, the wrench structure 320 includes a wrench protrusion provided on the screw plug 310. By providing a wrench protrusion as the wrench structure 320 on the screw plug 310, an intuitive and easy-to-use point of force is provided to the operator. Compared to a wrench groove, the wrench protrusion does not weaken the overall strength of the screw plug 310 and helps to improve the durability of the screw plug 310.

[0063] In another feasible embodiment of this utility model, such as Figure 5 In the embodiment shown, a limiting shoulder 220 is provided on the inner wall of the water outlet pipe 200, and the flow control component 300 is disposed on the limiting shoulder 220. The flow regulation structure also includes a breaking structure 400 for connecting the flow control component 300 and the inner wall of the water outlet pipe 200. The flow control component 300 can be detached by breaking the breaking structure 400.

[0064] The limiting shoulder 220 can stably support the flow control component 300 and accurately limit the installation position of the flow control component 300, thereby improving the installation accuracy of the flow control component 300.

[0065] By breaking through the structure 400, the flow control component 300 and the water outlet pipe 200 can be connected, so that the flow control component 300 can be stably installed in the water outlet channel 20, ensuring the installation stability of the flow control component 300.

[0066] Furthermore, by applying an external force to the flow control component 300, when the external force exceeds the structural limit of the breaking structure 400, the breaking structure 400 can be destroyed. At this time, the flow control component 300 can be removed from the water outlet channel 20, realizing the detachable setting of the flow control component 300, which greatly improves the convenience of maintenance and replacement of the flow control component 300.

[0067] Designers can adjust the specific structure of the demolition structure 400 according to the usage requirements, and no specific restrictions are imposed here. Preferably, the demolition structure 400 includes a plurality of welded portions 410 for connecting the inner wall of the flow control component 300 and the water outlet pipe 200, and the plurality of welded portions 410 are spaced apart and arranged in a ring.

[0068] By setting multiple welding sections 410, the installation stability of the flow control component 300 is ensured, while also avoiding the problem of excessive structural strength of the dismantling structure 400, facilitating the rapid dismantling of the dismantling structure 400 to remove the flow control component 300. Designers can adjust the specific number and arrangement of the welding sections 410 according to usage needs, and no specific restrictions are imposed here.

[0069] More preferably, the welded portion 410 is formed by spot welding. By using spot welding, multiple welded portions 410 can be formed quickly, thereby enabling the flow control component 300 to be quickly installed into the outlet pipe 200, improving installation convenience.

[0070] In an embodiment of this utility model, the through hole includes a straight hole section 311 extending along the axis of the flow control component 300, and the diameter L1 of the straight hole section 311 constitutes the minimum diameter of the through hole.

[0071] Designers can adjust the diameter L1 of the straight hole section 311 according to usage requirements, without specifying a particular value. Preferably, the diameter L1 of the straight hole section 311 is between Φ5mm and Φ13.5mm.

[0072] By setting the through hole as a straight section 311 and making the straight section 311 the minimum diameter of the through hole, the straight section 311 can effectively control the flow rate and pressure of the fluid when it passes through, and avoid the decline in fluid dynamic performance caused by the orifice being too large or too small.

[0073] Furthermore, by setting the aperture L1 range of the straight hole section 311 to Φ5mm to Φ13.5mm, the precise flow rate adjustment requirements under different application scenarios are met, while ensuring the feasibility and economy of the processing technology.

[0074] In addition, the straight hole section 311 can form a stable fluid channel in the pump body, reducing eddies and energy loss, thereby improving the overall efficiency and operational stability of the pump.

[0075] In one feasible embodiment, the diameter L1 of the straight hole section 311 is Φ8mm.

[0076] In another feasible embodiment, the diameter L1 of the straight hole section 311 is Φ10mm.

[0077] In another feasible embodiment, the diameter L1 of the straight hole section 311 is Φ13.5mm.

[0078] Furthermore, the through hole also includes a first tapered hole section 312 extending from the straight hole section 311 toward the direction away from the pump body volute 10, and the diameter of the first tapered hole section 312 gradually increases along the direction away from the straight hole section 311; and / or, the through hole also includes a second tapered hole section 313 extending from the straight hole section 311 toward the pump body volute 10, and the diameter of the second tapered hole section 313 gradually increases along the direction away from the straight hole section 311.

[0079] By incorporating a first conical orifice section 312 and / or a second conical orifice section 313 within the through-hole, the conical orifice structure enables a smooth transition of fluid across different regions, thereby reducing turbulence and pressure loss and improving fluid transport efficiency. Furthermore, the conical orifice structure not only enhances the overall performance of the pump equipment but also strengthens its operational stability and reliability.

[0080] In one feasible embodiment, the through hole includes a first tapered section 312 extending from a straight section 311 toward the direction away from the pump body volute 10, and the diameter of the first tapered section 312 gradually increases along the direction away from the straight section 311. The first tapered section 312 and the straight section 311 can be connected by a chamfer transition.

[0081] By setting the first conical orifice section 312 and gradually increasing its diameter away from the straight orifice section 311, the first conical orifice can effectively reduce turbulence and energy loss when the fluid flows out of the straight orifice section 311.

[0082] Furthermore, the gradually expanding cone shape of the first conical orifice section 312 helps to smoothly transition the fluid, reducing the local resistance coefficient and thus improving fluid delivery efficiency. In addition, the first conical orifice section 312 can also mitigate the impact and vibration caused by the sudden expansion of the fluid, reduce noise generation, and ensure stable operation of the pump in the high-efficiency range.

[0083] In another feasible embodiment, the through hole includes a second tapered hole section 313 extending from the straight hole section 311 toward the pump body volute 10, and the diameter of the second tapered hole section 313 gradually increases in the direction away from the straight hole section 311. The second tapered hole section 313 and the straight hole section 311 can be connected by a chamfer transition.

[0084] By setting a second conical orifice section 313 and gradually increasing its diameter away from the straight orifice section 311, the flow smoothness of fluid entering the straight orifice section 311 from the pump body volute 10 can be effectively optimized.

[0085] Furthermore, the gradually expanding cone shape of the second conical orifice section 313 helps to evenly distribute the fluid, reduce eddies and pressure losses, thereby improving pump efficiency and reducing energy consumption. In addition, the second conical orifice section 313 can also mitigate the impact and vibration caused by sudden fluid contraction and reduce flow dead zones, further improving the stability and reliability of pump operation.

[0086] In another feasible embodiment, the through hole includes a first tapered hole section 312 extending from the straight hole section 311 toward the direction away from the pump body volute 10, and a second tapered hole section 313 extending from the straight hole section 311 toward the pump body volute 10.

[0087] By combining the first conical bore section 312 and the second conical bore section 313, the flow dead zone and flow vortex caused by the abrupt change in the flow channel cross section are reduced, and the local loss of fluid flow is reduced. This not only improves the overall efficiency and operational stability of the pump, but also effectively reduces noise and vibration, thereby better meeting the performance requirements under various working conditions.

[0088] Designers can adjust the exit angle α of the first conical hole section 312 and the inlet angle β of the second conical hole section 313 according to the needs of use, without making specific restrictions here.

[0089] For example, along the direction of water flow, the outlet angle α of the first conical section 312 is 30°±10°; and / or, the inlet angle β of the second conical section 313 is 60°±10°.

[0090] Preferably, the outlet angle α of the first conical section 312 is 30°±10°; and the inlet angle β of the second conical section 313 is 60°±10°.

[0091] More preferably, the outlet angle α of the first conical section 312 is 30°; and the inlet angle β of the second conical section 313 is 60°.

[0092] When the inlet angle β of the second conical section 313 is 60°, the flow resistance is small, ensuring that the energy loss of the fluid when it enters the straight section 311 from the pump body volute 10 is low. The outlet angle of the first conical section 312 is set to 30°, which is to minimize the flow resistance as the flow channel cross-section increases from small to large when the installation space of the screw plug 310 is limited, while avoiding the problems of increased processing difficulty and reduced strength caused by excessive angle.

[0093] In the embodiments of this utility model, such as Figure 1 , Figure 6 , Figure 7 and Figure 8 In the embodiment shown, the water outlet channel 20 includes an upper channel 21 and a lower channel 22. The lower channel 22 connects the upper channel 21 and the pump body volute 10. The flow control component 300 is disposed in the upper channel 21. The aperture size of the lower channel 22 is not greater than the aperture size of the upper channel 21.

[0094] Designers can adjust the aperture size of the lower channel 22 according to usage requirements; no specific limitations are imposed here. Preferably, the aperture size of the lower channel is Φ15mm to Φ25mm.

[0095] Due to the limitations of the pump body structure, in order to prevent damage to the pump body structure, the diameter of the lower channel 22 is not larger than that of the upper channel 21. However, when the diameter of the lower channel 22 is less than 15mm, it is impossible to ensure that it is tangent to the volute during processing, which makes processing difficult.

[0096] In one feasible embodiment, the size of the upper channel 21 is equal to the size of the lower channel 22.

[0097] In another feasible embodiment, such as Figure 9 , Figure 10 and Figure 11 In the embodiment shown, the size of the lower channel 22 is smaller than the size of the upper channel 21.

[0098] By setting upper channels 21 and lower channels 22 with different diameters, the larger upper channel 21 not only significantly reduces the processing difficulty, but also makes the form and position tolerances easier to control, thereby greatly improving the consistency of products and the processing yield.

[0099] The lower channel 22 has a smaller diameter than the upper channel 21 but not less than 15mm. This not only prevents damage to the pump body structure during processing but also provides better processing accuracy. It reduces the problem of non-tangential flow channels caused by deviations in diameter, positional offsets, or tilting of the round hole, ensuring the smoothness of fluid flow within the pump body and further optimizing the pump's performance and efficiency.

[0100] In a preferred embodiment of this example, the upper channel 21 is a DN25 pipe with a corresponding aperture L2 of 27mm, and the aperture L3 of the lower channel 22 is Φ15mm-Φ25mm. Designers can select the appropriate aperture based on their needs, such as L3 being Φ20mm, where L2 is the inner diameter of the upper channel and L3 is the inner diameter of the lower channel.

[0101] Of course, in other embodiments, the upper channel 21 can also be a DN20 pipe or a DN15 pipe, which can be selected according to the pipe of the matching user end, and the diameter L3 of the lower channel 22 can not exceed the size L2 of the upper channel 21 and not be less than 15mm.

[0102] Furthermore, the pressure rating of the pump casing 100 can be set to Class 300, and the outlet of the water outlet pipe 200 is equipped with a flange 210. Designers can adjust the distance L4 from the flange end face to the straight hole section 311 of the through hole according to usage requirements; no specific numerical limit is specified here. For example, in a feasible embodiment, the distance L4 from the flange 210 end face to the straight hole section 311 of the through hole is approximately 30 mm.

[0103] Implementation Method 2

[0104] An embodiment of this utility model provides a pump device, including the flow regulating structure as described in Embodiment 1. The structure and effect of this flow regulating structure are the same as those described in Embodiment 1, and will not be repeated here.

[0105] Designers can determine the specific model of the pump equipment according to the usage requirements, and no specific restrictions are imposed here. Preferably, the pump equipment is a small-flow centrifugal pump.

[0106] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0107] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A flow regulating structure, characterized by, The application relates to a flow regulating structure of a water pump. The application relates to a flow regulating structure of a water pump. The application relates to a flow regulating structure of a water pump. The application relates to a flow regulating structure of a water pump.

2. The flow regulating structure of claim 1, wherein, The application relates to a flow regulating structure of a water pump.

3. The flow regulating structure of claim 2, wherein, The application relates to a flow regulating structure of a water pump.

4. The flow regulating structure of claim 3, wherein, The application relates to a flow regulating structure of a water pump.

5. The flow regulating structure of claim 2, wherein, The application relates to a flow regulating structure of a water pump.

6. The flow regulating structure of any one of claims 1-5, wherein, The application relates to a flow regulating structure of a water pump.

7. The flow regulating structure of claim 6, wherein, The application relates to a flow regulating structure of a water pump.

8. The flow regulating structure of any one of claims 1-5, wherein, The application relates to a flow regulating structure of a water pump.

9. The flow regulating structure of claim 8, wherein, The application relates to a flow regulating structure of a water pump.

10. A pump apparatus, characterized by, The application relates to a flow regulating structure of a water pump. The application relates to a flow regulating structure of a water pump. The application relates to a flow regulating structure of a water pump. The application relates to a flow regulating structure of a water pump. The application relates to a flow regulating structure of a water pump. The application relates to a flow regulating structure of a water pump. The application relates to a flow regulating structure of a water The application relates to a flow regulating structure of a water pump. The application relates to a flow The application relates to a flow regulating structure of a water pump. The application relates to a The application relates to a flow regulating structure of a water pump. The application relates to a

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