A cover plate for a pump, a pump, and a wall-hung boiler.

Abstract

This invention relates to a cover plate for a pump, a pump, and a wall-mounted boiler. The cover plate for the pump includes an upper wall plate and a lower wall plate arranged axially along the cover plate. The upper wall plate forms a pressure chamber, and the lower wall plate forms an inlet chamber. The pressure chamber communicates with the inlet chamber. A first mounting surface is provided on the outer circumferential surface of the upper wall plate, and an internal outlet is provided at the end of the upper wall plate away from the lower wall plate. In this embodiment, the pressure chamber is used to house an impeller, which pressurizes the water inside the pressure chamber. The pressure chamber is not formed on the pump body, but rather on the cover plate. The size of the pressure chamber can be smaller than the size of the pump body, thereby matching the small-sized impeller with high rotational speed, resulting in a uniform internal flow field distribution, reduced hydraulic losses, and improved pump hydraulic efficiency. By providing an inlet chamber communicating with the pressure chamber on the cover plate, the working medium is introduced into the pressure chamber from the inlet chamber, thereby reducing flow separation, significantly improving the uniformity of the flow field, and thus improving pump efficiency.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, and more particularly to a cover plate for a pump, a pump, and a wall-hung boiler. Background Technology

[0002] Centrifugal pumps, as fluid machinery for energy transfer, convert mechanical energy into fluid energy to transport fluids to higher altitudes or spaces with higher pressure, or to overcome pipeline resistance to deliver fluids over long distances. The water pump structure in a wall-hung boiler needs to meet various installation requirements, resulting in a relatively complex pump body structure with numerous interfaces to the boiler, leading to specific requirements for its size and volume. To improve overall pump efficiency, water pumps used in wall-hung boilers operate at high speeds; to achieve this high-speed impeller rotation, a smaller impeller size is required.

[0003] The pump body of the wall-hung boiler's water pump has an injection-molded inlet chamber and a pressure chamber. Due to the influence of the inlet chamber structure and the limitations of the injection molding process, the base circle size of the pressure chamber is relatively large. The difference between the base circle size of the pressure chamber and the outer diameter of the impeller is large. The mismatch between the size of the pressure chamber and the impeller results in an uneven flow field distribution in the pressure chamber, large hydraulic losses, and low pump efficiency.

[0004] Therefore, there is an urgent need for a cover plate for pumps, pumps, and wall-hung boilers to solve the above-mentioned technical problems. Summary of the Invention

[0005] One object of the present invention is to provide a cover plate for a pump to improve pump efficiency.

[0006] To achieve the above objectives, a first aspect of the present invention provides a cover plate for a pump, comprising an upper wall plate and a lower wall plate arranged axially along the cover plate. The upper wall plate forms a pressure chamber for accommodating an impeller, and the lower wall plate forms a water inlet chamber. The pressure chamber communicates with the water inlet chamber. A first mounting surface is provided on the outer peripheral surface of the upper wall plate. The cover plate is connected to the pump body through the first mounting surface. An inner water outlet is provided at the end of the upper wall plate away from the lower wall plate, and the inner water outlet communicates with an outer water outlet provided on the pump body.

[0007] Optionally, the pressure chamber includes a first chamber and a second chamber that are connected. The second chamber has a frustum-shaped structure. The larger diameter end of the second chamber is located near the first chamber, and the smaller diameter end is located near the water inlet chamber.

[0008] Optionally, the upper wall panel includes a vertical portion and an inclined portion. The vertical portion extends along the axial direction of the cover plate and forms the first chamber, while the inclined portion is arranged at an angle to the axial direction of the cover plate and forms the second chamber.

[0009] Optionally, the outer periphery of the upper wall panel is connected with a flange, and the end face of the flange forms the first mounting surface.

[0010] Optionally, the flange is provided with a positioning part for positioning the cover plate.

[0011] Optionally, the inner wall of the pressure chamber is spiral, cylindrical, or quasi-spiral.

[0012] Optionally, the inner diameter of the water inlet chamber is smaller than the minimum inner diameter of the pressure chamber.

[0013] Another object of the present invention is to provide a pump that improves its efficiency.

[0014] To achieve this objective, the second aspect of the present invention adopts the following technical solution:

[0015] A pump, comprising the aforementioned cover plate for the pump.

[0016] Optionally, a second mounting surface is provided on the inner wall of the pump body, and the first mounting surface is connected to the second mounting surface.

[0017] Another object of the present invention is to provide a wall-hung boiler to reduce its energy consumption.

[0018] To achieve this objective, the third aspect of the present invention adopts the following technical solution:

[0019] A wall-hung boiler includes the pump described above.

[0020] As can be seen from the above, the technical solution provided by this invention uses a pressure chamber to house an impeller, which can pressurize the water inside the pressure chamber. The pressure chamber is not formed on the pump body, but rather on a cover plate. The size of the pressure chamber can be smaller than the size of the pump body; more specifically, the diameter of the pressure chamber can be smaller than the diameter of the pump body, thus matching the high-speed, small-sized impeller, resulting in a uniform internal flow field distribution, reduced hydraulic losses, and improved pump hydraulic efficiency. By providing an inlet chamber on the cover plate that communicates with the pressure chamber, the working medium is introduced into the pressure chamber from the inlet chamber, thereby reducing flow separation and significantly improving the uniformity of the flow field, thus increasing pump efficiency. The cover plate is connected to the pump body through the first mounting surface, which improves the stability of the cover plate and prevents displacement. The cover plate has a simple structure and the mold process is simple and easy to implement, superior to existing pump bodies in terms of process technology, reducing mold costs. Furthermore, forming the pressure chamber on the cover plate enables pump body standardization; for pumps with different performance requirements, it is not necessary to replace the pump body with a different inner diameter, only the corresponding cover plate needs to be replaced. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the pump provided in an embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional view of the pump provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of a cover plate for a pump provided in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the cover plate for a pump provided in an embodiment of the present invention from another perspective.

[0025] In the picture:

[0026] 20. Cover plate; 1. Upper wall plate; 11. Vertical part; 12. Inclined part; 2. Lower wall plate; 3. Pressure chamber; 31. First chamber; 32. Second chamber; 4. Inlet chamber; 5. Inner outlet; 6. Flange; 61. Positioning part; 62. First mounting surface; 7. First baffle; 8. Second baffle; 9. Flow guiding assembly; 91. Guide plate; 92. First baffle; 93. Second baffle;

[0027] 10. Pump body; 30. Outlet water inlet; 40. Bearing housing; 50. Shaft; 60. Impeller; 70. Inlet water inlet. Detailed Implementation

[0028] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings, not all of them.

[0029] This invention defines certain directional terms. Unless otherwise stated, the directional terms used, such as "up," "down," "left," "right," "inner," and "outer," are used for ease of understanding and therefore do not constitute a limitation on the scope of protection of this invention.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] This embodiment provides a pump, which is mainly used in wall-hung boilers, but is not limited to this. It can also be used in other occasions where liquid needs to be pressurized to improve the efficiency of the pump.

[0033] like Figures 1-4 As shown, the pump provided in this embodiment includes a pump body 10 and a cover plate 20 for the pump (hereinafter referred to as cover plate 20). The pump may also include an impeller 60. The pump body 10 is used to accommodate the cover plate 20 and the impeller 60. The impeller 60 is used to pressurize the water in the cover plate 20.

[0034] The cover plate 20 includes an upper wall plate 1 and a lower wall plate 2 arranged along the axial direction of the cover plate 20. The upper wall plate 1 forms a water pressure chamber 3, which is used to accommodate an impeller 60. The impeller 60 can pressurize the water in the water pressure chamber 3. The lower wall plate 2 forms a water inlet chamber 4, and the water pressure chamber 3 is connected to the water inlet chamber 4. A first mounting surface 62 is provided on the outer peripheral surface of the upper wall plate 1. The cover plate 20 is connected to the pump body 10 through the first mounting surface 62. An inner water outlet 5 is opened at the end of the upper wall plate 1 away from the lower wall plate 2. The inner water outlet 5 is connected to the outer water outlet 30 opened on the pump body 10, so that the pressurized water in the water pressure chamber 3 is discharged through the inner outlet and the outer outlet.

[0035] In this embodiment, the pressure chamber 3 is used to house the impeller 60, which pressurizes the water inside the pressure chamber 3. The pressure chamber 3 is not formed on the pump body 10, but rather on the cover plate 20. The size of the pressure chamber 3 can be smaller than the size of the pump body 10; more specifically, the diameter of the pressure chamber 3 can be smaller than the diameter of the pump body 10, thus matching the high-speed, small-sized impeller 60, resulting in a uniform internal flow field distribution, reduced hydraulic losses, and improved pump hydraulic efficiency. By providing an inlet chamber 4 on the cover plate 20 that communicates with the pressure chamber 3, the working medium is introduced into the pressure chamber 3 from the inlet chamber 4, thereby reducing flow separation and significantly improving the uniformity of the flow field, thus increasing pump efficiency. The cover plate 20 is connected to the pump body 10 via the first mounting surface 62, which improves the stability of the cover plate 20 and prevents displacement. The cover plate 20 has a simple structure and the mold process is simple and easy to implement, making it superior to the existing pump body 10 in terms of process technology, and reducing mold costs.

[0036] Meanwhile, by forming the pressure chamber 3 on the cover plate 20, the pump body 10 can be universalized. For pumps with different performance requirements, it is not necessary to replace the pump body 10 with a different inner diameter; only the corresponding cover plate 20 needs to be replaced.

[0037] like Figure 2 As shown, optionally, the central axes of the cover plate 20, impeller 60 and pump body 10 coincide.

[0038] Optionally, the pump also includes a bearing housing 40 and a rotating shaft 50. The bearing housing 40 is disposed on the upper side of the cover plate 20, and the rotating shaft 50 is rotatably connected to the bearing housing 40 through a bearing. An impeller 60 is connected to one end of the rotating shaft 50. The motor drives the rotating shaft 50 to rotate, and the rotating shaft 50 drives the impeller 60 to rotate.

[0039] The bearing housing 40 can be connected to the pump body 10 by means of ultrasonic welding or other methods. Preferably, there is a gap between the bearing housing 40 and the cover plate 20 to avoid friction between the bearing housing 40 and the cover plate 20.

[0040] Optionally, the inner diameter of the water inlet chamber 4 is smaller than the minimum inner diameter of the pressure chamber 3 to further reduce flow separation.

[0041] Continue as Figure 2 As shown, the pressure chamber 3 includes a first chamber 31 and a second chamber 32 that are connected. The second chamber 32 has a frustum-shaped structure. The larger diameter end of the second chamber 32 is located near the first chamber 31, and the smaller diameter end is located near the water inlet chamber 4. The second chamber 32 corresponds to the position near the end of the impeller 60. The frustum-shaped structure of the second chamber 32 can correspond to the contour of the lower end face of the blades of the impeller 60. The first chamber 31 corresponds to the upper part of the impeller 60, which has a cylindrical contour, thereby making the shape of the pressure chamber 3 more precisely matched to the impeller 60. Optionally, the inner wall of the pressure chamber 3 is spiral, cylindrical, or quasi-spiral.

[0042] like Figures 2-4 As shown, optionally, the upper wall panel 1 includes a vertical portion 11 and an inclined portion 12. The vertical portion 11 extends along the axial direction of the cover plate 20 and forms the first chamber 31. The inclined portion 12 is arranged at an angle to the axial direction of the cover plate 20 and forms the second chamber 32. The upper wall panel 1 has a simple structure and is easy to process into molds.

[0043] Optionally, the inner wall of the first chamber 31 is spiral, cylindrical, or quasi-spiral. The vertical portion 11 extends around the axis of the cover plate 20 to form a spiral, annular, or quasi-spiral shape, thereby forming the inner wall of the spiral, cylindrical, or quasi-spiral pressure chamber 3.

[0044] Optionally, the cross-sectional area of ​​the inner outlet 5 gradually increases from the end near the pressure chamber 3 to the end near the outlet 30, that is, the cross-sectional area of ​​the inlet end of the inner outlet 5 is smaller than the cross-sectional area of ​​the outlet end, thereby facilitating the increase of the medium pressure. More specifically, the width of the inner outlet 5 gradually increases from the end near the pressure chamber 3 to the end near the outlet 30.

[0045] Optionally, the inner outlet 5 is formed on the vertical part 11, and the two ends of the outlet on the vertical part 11 are respectively connected to the first baffle 7 and the second baffle 8, and the inner outlet 5 is formed between the first baffle 7 and the second baffle 8.

[0046] Optionally, both the pressure chamber 3 and the water inlet chamber 4 have open ends that are far apart from each other.

[0047] Optionally, a flange 6 is connected to the outer periphery of the upper wall plate 1, and the end face of the flange 6 forms the first mounting surface 62. Specifically, the lower end face of the flange 6 forms the first mounting surface 62. A second mounting surface is provided on the inner wall of the pump body 10, and the first mounting surface 62 is connected to the second mounting surface. Specifically, the second mounting surface can be a stepped surface provided on the inner wall of the pump body 10, and the first mounting surface 62 can be placed on the stepped surface. Optionally, the first mounting surface 62 and the second mounting surface are connected by ultrasonic welding.

[0048] like Figure 4 As shown, the flange 6 is provided with a positioning part 61 for positioning the cover plate 20. Specifically, the flange 6 is an annular flange 6, and the positioning part 61 is a positioning plane. For example, a planar cut can be formed by cutting a part of the flange 6 along the axial direction, and a positioning protrusion can be provided on the inner wall of the pump body 10. By positioning the positioning part 61 and the positioning protrusion opposite to each other, the positioning of the cover plate 20 can be achieved.

[0049] An inlet 70 can also be provided on the pump body 10. The inlet 70 is located on the side wall of the pump body 10 near the lower wall plate 2. The medium enters the pump body 10 through the inlet 70 and flows through the inlet chamber 4, the pressure chamber 3, the inner outlet 5 and the outer outlet 30 in sequence under the action of the impeller 60.

[0050] like Figure 3 and Figure 4 As shown, optionally, the cover plate 20 also includes a flow guiding component 9, which is disposed on one radial side of the lower wall plate 2. The flow guiding component 9 can guide the medium, preventing the fluid medium from directly impacting the inlet chamber 4, thereby reducing flow separation, significantly improving the uniformity of the flow field, and thus improving the efficiency of the pump.

[0051] Furthermore, the flow guiding assembly 9 includes a guide plate 91, a first baffle plate 92, and a second baffle plate 93, which are circumferentially spaced and connected to the guide plate 91. The first baffle plate 92 and the second baffle plate 93 extend radially and axially along the cover plate 20, and have the function of reducing turbulence and reducing the flow velocity of the medium.

[0052] The guide plate 91 can be an arc plate. Optionally, the first baffle plate 92 is connected to the middle of the circumference of the guide plate 91, and the second baffle plate 93 is connected to the end of the circumference of the guide plate 91. The beginning of the circumference of the guide plate 91 is directly opposite to the water inlet 70. The medium flowing into the pump body 10 from the water inlet 70 flows directly between the guide plate 91 and the inner wall of the pump body 10, flows directly between the guide plate 91 and the lower wall plate 2, and flows directly into the water inlet chamber 4.

[0053] This embodiment also provides a wall-hung boiler, which includes the pump described above, and the wall-hung boiler has low energy consumption.

[0054] Although the present invention has been described in detail above with general descriptions, specific embodiments, and experiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A cover plate for a pump, characterized in that, The cover plate includes an upper wall plate (1) and a lower wall plate (2) arranged along the axial direction of the cover plate. The upper wall plate (1) forms a water pressure chamber (3) for accommodating an impeller (60). The lower wall plate (2) forms a water inlet chamber (4). The water pressure chamber (3) is connected to the water inlet chamber (4). A first mounting surface (62) is provided on the outer circumferential surface of the upper wall plate (1). The cover plate is connected to the pump body (10) through the first mounting surface (62). An inner water outlet (5) is opened at one end of the upper wall plate (1) away from the lower wall plate (2). The inner water outlet (5) is connected to the outer water outlet (30) opened on the pump body (10). The water pressure chamber (3) includes a first chamber (31) and a second chamber (32) that are connected. The inner wall of the first chamber (31) is cylindrical, and the second chamber (32) is a frustum-shaped structure. The upper wall panel (1) includes a vertical part (11) and an inclined part (12), the vertical part (11) forming the first chamber (31) and the inclined part (12) forming the second chamber (32); The cross-sectional area of ​​the inner outlet (5) gradually increases from the end near the pressure chamber (3) to the end near the outlet (30); The cover plate (20) also includes a diversion assembly (9), which is located on one side of the lower wall plate (2) in the radial direction. The lower wall plate (2) is cylindrical. The diversion assembly (9) includes a guide plate (91), the beginning of the circumferential direction of the guide plate (91) is directly opposite to the inlet (70). The medium flowing into the pump body (10) from the inlet (70) is partially directly flowing between the guide plate (91) and the inner wall of the pump body (10), partially flowing between the guide plate (91) and the lower wall plate (2), and the other part flowing directly into the inlet chamber (4). The lower wall panel (2) is cylindrical, and the lower end of the lower wall panel (2) is provided with a lower wall panel opening. The lower end of the drainage component (9) is provided with a guide plate opening, and the lower wall panel opening is opposite to the guide plate opening.

2. The cover plate for a pump according to claim 1, characterized in that, The vertical part (11) extends along the axial direction of the cover plate, and the inclined part (12) is set at an angle to the axial direction of the cover plate.

3. The cover plate for a pump according to claim 1, characterized in that, The outer periphery of the upper wall panel (1) is connected to a flange (6), and the end face of the flange (6) forms the first mounting surface (62).

4. The cover plate for a pump according to claim 3, characterized in that, The flange (6) is provided with a positioning part (61) for positioning the cover plate.

5. The cover plate for a pump according to claim 1, characterized in that, The inner wall of the pressure chamber (3) is spiral, cylindrical or quasi-spiral.

6. The cover plate for a pump according to claim 1, characterized in that, The inner diameter of the water inlet chamber (4) is smaller than the minimum inner diameter of the water pressure chamber (3).

7. A pump, characterized in that, It includes a pump body (10) and a cover plate for the pump as described in any one of claims 1-6.

8. The pump according to claim 7, characterized in that, The pump body (10) has a second mounting surface on its inner wall, and the first mounting surface (62) is connected to the second mounting surface.

9. A wall-hung boiler, characterized in that, Includes the pump described in claim 7 or 8.

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