A double-suction pump body and a double-suction pump

Abstract

The utility model relates to a kind of double-suction pump pump body and double-suction pump, double-suction pump pump body includes pump shell and pump cover, pump shell inner cavity includes installation cavity, water cavity and first water suction cavity communicated in turn, pump shell sets import, export and installation port, installation port is communicated with installation cavity, first water suction cavity is communicated with import and water cavity respectively, water cavity is communicated with export, pump cover is detachably sealed connection with pump shell at installation port, and pump cover is at least locally adapted to insert in installation cavity, the part of pump cover inserted installation cavity is provided with hollow part, hollow part and the cavity wall of installation cavity form second water suction cavity, second water suction cavity is communicated with import and water cavity respectively. The pump shell cooperation structure of the above-mentioned double-suction pump pump body is simple, the contact area is small, easy to seal to reduce the probability of leakage, the processing difficulty and processing cost are low, improve the smoothness of water flow channel in pump body, reduce local turbulent flow phenomenon, reduce water loss, effectively improve double-suction pump efficiency.

Description

Technical Field

[0001] This utility model relates to the field of water pump technology, and in particular to a double-suction pump body and a double-suction pump. Background Technology

[0002] Double-suction pumps, as an important type of centrifugal pump, are widely used due to their high head and large flow rate. The double-suction impeller of a double-suction pump is equivalent to two single-suction impellers symmetrically arranged back-to-back. Correspondingly, the water flow channel within the pump body includes a pressure chamber and two suction chambers symmetrically arranged about the pressure chamber. The inlet of the double-suction pump connects to the outlet sequentially through the suction chamber and the pressure chamber. When the double-suction impeller rotates, water is drawn from the inlet into the two suction chambers, and then pumped out through the pressure chamber from the outlet. During this process, the axial forces on both sides of the double-suction impeller are evenly distributed, resulting in smooth operation. Compared to a single-suction pump, the flow rate can be doubled for the same impeller outer diameter.

[0003] However, current double-suction pumps are split-case pumps, meaning the pump body is horizontally split, with the pressure chamber and two suction chambers divided into two. During manufacturing, the two parts of the pump body need to be processed separately, resulting in high processing costs and inconvenient assembly. After assembly, the position where the two parts of the pump body combine to form the pressure chamber and suction chamber is prone to step-like protrusions due to machining accuracy issues, causing increased turbulence within the double-suction pump. This leads to increased energy consumption and reduced efficiency. Therefore, split-case double-suction pumps have high requirements for machining accuracy, further increasing processing costs. At the same time, the large contact area that needs to be sealed between the two parts of the pump body increases the probability of leakage. Utility Model Content

[0004] The first objective of this utility model is to provide a double-suction pump body that is easy to process and assemble, improves the smoothness of the water flow channel inside the pump body, reduces local turbulence in the water flow channel inside the pump body, reduces hydraulic loss, and improves the efficiency of the double-suction pump.

[0005] The second objective of this invention is to provide a double-suction pump including the double-suction pump body.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] In a first aspect of this application, a double-suction pump body is provided, comprising:

[0008] The pump casing has an inner cavity comprising a mounting cavity, a pressure chamber, and a first suction chamber connected in sequence. The pump casing is provided with an inlet, an outlet, and a mounting port. The mounting port is connected to the mounting cavity. The first suction chamber is connected to both the inlet and the pressure chamber. The pressure chamber is connected to the outlet.

[0009] The pump cover is detachably and sealingly connected to the pump housing at the mounting port, and the pump cover is at least partially fitted into the mounting cavity. The portion of the pump cover inserted into the mounting cavity has a hollowed-out portion, which cooperates with the cavity wall of the mounting cavity to form a second water suction cavity. The second water suction cavity is connected to the inlet and the pressure chamber, respectively.

[0010] In one possible implementation, a sealing cavity is provided on the pump cover, and the sealing cavity communicates with the hollowed-out portion to form a through space through the pump cover. The through space is used for the motor shaft of the drive motor of the double-suction pump to pass through the pump cover and extend into the water pressure chamber to connect with the double-suction impeller of the double-suction pump. The sealing cavity is used to accommodate a sealing device, and the sealing device is used to seal the gap between the motor shaft and the pump cover.

[0011] In one possible implementation, the end face of the pump cover away from the first suction chamber is provided with a clearance groove for avoiding the drive motor of the double-suction pump, and / or, the end face of the pump casing away from the first suction chamber is provided with a clearance groove for avoiding the drive motor of the double-suction pump.

[0012] In one possible implementation, the outer peripheral surface of the pump cover away from the first suction chamber is provided with a first annular step surface, the first annular step surface facing the first suction chamber, and the inner peripheral surface of the mounting cavity away from the first suction chamber is provided with a second annular step surface, the second annular step surface facing away from the first suction chamber, and the first annular step surface and the second annular step surface clamp the sealing member.

[0013] In one possible implementation, the hollowed-out portion includes a molding compensation portion and a first transition connection portion. The molding compensation portion cooperates with the cavity wall of the mounting cavity to form the second water absorption cavity, and the first transition connection portion is used to connect the molding compensation portion with the water pressure cavity.

[0014] In one possible implementation, the first transition connection includes a first guide portion, a first mating portion, and a first clearance portion arranged sequentially from near to far relative to the forming compensation portion. The first guide portion is surrounded by a smooth curved surface so that the first guide portion and the wall surface of the forming compensation portion are smoothly connected. The first mating portion is used to rotatably seal with the first inlet end of the double suction impeller of the double suction pump. The first clearance portion is used to avoid the double suction impeller of the double suction pump.

[0015] In one possible implementation, the inner cavity of the pump casing is provided with a second transition connection between the first suction chamber and the pressure chamber. The second transition connection includes a second guide portion, a second mating portion, and a second clearance portion arranged sequentially from near to far from the first suction chamber. The second guide portion is surrounded by a smooth curved surface so that the second guide portion smoothly transitions to the wall of the first suction chamber. The second mating portion is used to rotatably seal with the second inlet end of the double suction impeller of the double suction pump. The second clearance portion is used to avoid the double suction impeller of the double suction pump.

[0016] In one possible implementation, the pump housing includes a housing body and a transition member, the transition member being detachably disposed within the housing body, and the second flow guide portion and the second mating portion being disposed within the transition member.

[0017] As can be seen from the above technical solution, this utility model discloses a double-suction pump body, including a pump casing and a pump cover. The inner cavity of the pump casing includes an installation cavity, a pressure chamber, and a first suction chamber that are connected in sequence. The pump casing is provided with an inlet, an outlet, and an installation port. The installation port is connected to the installation cavity. The first suction chamber is connected to both the inlet and the pressure chamber. The pressure chamber is connected to the outlet. The pump cover is detachably and sealingly connected to the pump casing at the installation port. The pump cover is at least partially fitted and inserted into the installation cavity. The part of the pump cover inserted into the installation cavity is provided with a hollow part. The hollow part and the cavity wall of the installation cavity cooperate to form a second suction chamber. The second suction chamber is connected to both the inlet and the pressure chamber.

[0018] As can be seen, most of the structure of the water flow channel of the double-suction pump (pressure chamber, part of the first suction chamber, and the second suction chamber) is integrally machined in the pump casing of the above-mentioned double-suction pump body. Only the hollow parts that serve as the first suction chamber need to be machined on the pump cover. During assembly, the pump cover only needs to be inserted into the mounting cavity of the pump casing and fixed. The fit structure between the pump casing and the pump cover is simple, with a small contact area, making it easier to seal and helping to reduce the probability of leakage. The pump casing and the pump cover only need to fit together to form the first suction chamber. The structure is simple and easy to process, which helps to reduce the processing difficulty and processing cost. It can also effectively reduce the stepped protrusions at the joint surface between the pump casing and the pump cover, improve the smoothness of the water flow channel in the pump body, thereby effectively reducing the local turbulence phenomenon in the water flow channel in the pump body, reducing hydraulic loss, and effectively improving the efficiency of the double-suction pump.

[0019] In a second aspect of this application, a dual-suction pump is provided, comprising:

[0020] A dual-suction pump body, wherein the dual-suction pump body is as described in the first aspect and its possible implementations;

[0021] The double-suction impeller is rotatably mounted in the pressure chamber of the double-suction pump body;

[0022] A drive motor, the motor shaft of which extends into the body of the double-suction pump and is connected to the double-suction impeller.

[0023] In one possible implementation, the drive motor is an axial flux motor.

[0024] In one possible implementation, the housing of the drive motor is detachably connected to the pump housing of the double-suction pump body on the side of the mounting port of the pump housing, and the pump cover of the double-suction pump body is pressed and fixed to the pump housing of the double-suction pump body.

[0025] The double-suction pump disclosed in this application adopts the double-suction pump body in the first aspect and its possible implementations described above. Therefore, the double-suction pump should have the same beneficial effects as the double-suction pump body described above, which will not be repeated here. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0027] Figure 1 A schematic diagram of the pump casing of the dual-suction pump body provided in this embodiment of the utility model;

[0028] Figure 2 A cross-sectional view of the pump casing of the double-suction pump body provided in an embodiment of this utility model;

[0029] Figure 3 This is a schematic diagram of the structure of the pump cover of the dual-suction pump body provided in an embodiment of the present utility model;

[0030] Figure 4 A cross-sectional view of the pump cover of the double-suction pump body provided in an embodiment of this utility model;

[0031] Figure 5 An exploded view of the dual-suction pump body provided in an embodiment of this utility model;

[0032] Figure 6 A cross-sectional view of the pump body of the dual-suction pump provided in an embodiment of this utility model.

[0033] In the picture:

[0034] 100 is the pump casing; 110 is the inlet; 120 is the outlet; 130 is the mounting port; 140 is the mounting cavity; 150 is the pressure chamber; 160 is the first suction chamber; 170 is the annular groove; 171 is the second annular stepped surface; 172 is the sealing groove; 180 is the transition component; 181 is the second guide section; 182 is the second mating section; 190 is the second clearance section.

[0035] 200 is the pump cover; 210 is the hollowed-out part; 211 is the molded compensation part; 212 is the first transition connection part; 2121 is the first flow guide part; 2122 is the first mating part; 2123 is the first clearance part; 220 is the sealing cavity; 230 is the annular boss; 231 is the first annular stepped surface; 240 is the clearance groove;

[0036] 300 features a double-suction impeller;

[0037] 400 is the drive motor; 410 is the motor shaft;

[0038] 500 is a sealing device; 510 is a mechanical seal; 520 is a mechanical seal gland; 530 is a mechanical seal O-ring;

[0039] 600 is a sealing component. Detailed Implementation

[0040] One of the core features of this utility model is to provide a double-suction pump body. The structural design of the double-suction pump body makes it easy to process and assemble, improves the smoothness of the water flow channel inside the pump body, reduces local turbulence in the water flow channel inside the pump body, reduces hydraulic loss, and improves the efficiency of the double-suction pump.

[0041] Another core aspect of this utility model is to provide a double-suction pump that includes the above-mentioned double-suction pump body.

[0042] 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.

[0043] This application provides a dual-suction pump body, such as... Figures 1 to 4 As shown, the double-suction pump body includes a pump casing 100 and a pump cover 200.

[0044] Please refer to Figure 1 and Figure 2The pump casing 100 has an inner cavity comprising a mounting cavity 140, a pressure chamber 150, and a first suction chamber 160 connected in sequence. The mounting cavity 140, pressure chamber 150, and first suction chamber 160 are all integrally formed. There are no seams, welds, or other protruding structures in the mounting cavity 140, pressure chamber 150, and first suction chamber 160. The pump casing 100 is provided with an inlet 110, an outlet 120, and a mounting port 130. Flange structures are provided at the inlet 110, outlet 120, and mounting port 130 of the pump casing 100. The flange structure at position 20 is used to connect the pipeline. The flange structure at mounting port 130 can be used to install the pump cover 200 or the housing of the drive motor 400. The inlet 110 and outlet 120 of the pump housing 100 can be coaxially arranged or at an angle. The axes of the inlet 110 and outlet 120 are perpendicular to the axis of the pump housing 100. The axis of the pump housing 100 is the rotation axis of the double-suction impeller 300 of the double-suction pump. The double-suction impeller 300 that is matched with the pump body of the double-suction pump in this application is the same as the double-suction impeller 300 in the prior art in terms of structure and working principle.

[0045] The mounting port 130 is connected to the mounting cavity 140. The mounting port 130 is located on one side of the pump casing 100 along the axial direction. It should be noted that the mounting port 130 is not only for installing the pump cover 200, but also for installing the double-suction impeller 300 of the double-suction pump into the pressure chamber 150 through the mounting port 130 before installing the pump cover 200. Therefore, the inner diameter of the mounting port 130 cannot be less than the outer diameter of the double-suction impeller 300 of the double-suction pump. The first suction chamber 160 is connected to the inlet 110 and the pressure chamber 150 respectively. The pressure chamber 150 is connected to the outlet 120.

[0046] Please see Figure 3 and Figure 4 The pump cover 200 is detachably and sealingly connected to the pump housing 100 at the mounting port 130, and the pump cover 200 is partially or completely fitted into the mounting cavity 140. The part of the pump cover 200 inserted into the mounting cavity 140 is provided with a hollow part 210. The hollow part 210 and the cavity wall of the mounting cavity 140 cooperate to form a second suction cavity. Generally speaking, the second suction cavity and the first suction cavity 160 should be completely symmetrical to ensure that the force on both sides of the double suction impeller 300 is uniform. However, the situation where the first suction cavity 160 and the second suction cavity are not completely symmetrical due to the problem of machining accuracy is also within the scope of protection of this application. The second suction cavity is connected to the inlet 110 and the pressure cavity 150 respectively. That is, the inlet 110 is connected to the pressure cavity 150 through the first suction cavity 160 and the second suction cavity respectively, and then connected to the outlet 120 through the pressure cavity 150.

[0047] It should be noted that, looking only at the pump body of the double-suction pump, the first suction chamber 160 and the second suction chamber are directly connected to the pressure chamber 150, but when the double-suction impeller 300 is installed, as... Figure 6As shown, the double-suction impeller 300 and the double-suction pump body are rotatably sealed together by a rotating sealing structure. The rotating sealing structure includes an impeller sealing ring disposed outside the inlet 110 end of the double-suction impeller 300 and a pump body sealing ring disposed on the inner cavity wall of the double-suction pump body. The impeller sealing ring and the pump body sealing ring are rotatably sealed together, so that the first suction chamber 160 and the second suction chamber can only communicate with the pressure chamber 150 through the flow channel on the double-suction impeller 300, preventing the water in the pressure chamber 150 from flowing back into the first suction chamber 160 and the second suction chamber on both sides during the operation of the double-suction pump.

[0048] Under the negative pressure generated by the rotation of the double suction impeller 300, the water flow enters the inlet 110 and is divided into two streams, which enter the first suction chamber 160 and the second suction chamber respectively. Then, from the two sides of the inlet 110 end of the double suction impeller 300, the water flows through the flow channel on the double suction impeller 300 into the pressure chamber 150, and finally flows out from the outlet 120.

[0049] The first water suction chamber 160 and the second water suction chamber are both semi-spiral structures, and the water pressure chamber 150 is a spiral structure.

[0050] Compared with the prior art, the pump casing 100 of the dual-suction pump body provided in this application embodiment has most of the structure of the water passage of the dual-suction pump (pressure chamber 150, part of the first suction chamber 160 and the second suction chamber) integrally machined. Only the hollow part 210 that serves as the other part of the first suction chamber 160 needs to be machined on the pump cover 200. During assembly, the pump cover 200 only needs to be inserted into the mounting cavity 140 of the pump casing 100 for fixation. The mating structure between the pump casing 100 and the pump cover 200 is simple, with a small contact area, making it easier to seal and helping to reduce the probability of leakage. The pump casing 100 and the pump cover 200 only need to fit together to form the first suction chamber 160. The structure is simple and easy to process, which helps to reduce the processing difficulty and processing cost. It can also effectively reduce the stepped protrusions at the mating surface between the pump casing 100 and the pump cover 200, improve the smoothness of the water passage in the pump body, thereby effectively reducing the local turbulence phenomenon in the water passage in the pump body, reducing hydraulic loss, and effectively improving the efficiency of the dual-suction pump.

[0051] It should be noted that the motor shaft 410 of the drive motor 400 can pass through the pump cover 200 and extend into the pressure chamber 150 to connect with the double-suction impeller 300, or it can pass through the pump housing 100 from the end away from the pump cover 200 along the axis of the pump housing 100 and extend into the pressure chamber 150 to connect with the double-suction impeller 300. In this embodiment, in order to simplify the assembly structure between the drive motor 400 and the double-suction pump body, and between the pump housing 100 and the pump cover 200 of the double-suction pump body, and to facilitate... In one embodiment of this application, the double-suction pump is assembled by having the motor shaft 410 of the drive motor 400 pass through the pump cover 200 and extend into the pressure chamber 150 to connect with the double-suction impeller 300. This only requires one mounting port 130 on the pump casing 100, and at the same time, it can ensure the smoothness of the cavity wall of the first suction chamber 160, avoiding the problem of reduced smoothness of the cavity wall of the first suction chamber 160 caused by installing the drive motor 400 from the first suction chamber 160 side of the pump casing 100.

[0052] Specifically, in order to achieve a sealed fit between the pump cover 200 and the motor shaft 410 of the drive motor 400, such as Figure 4 As shown, a sealing cavity 220 is provided on the pump cover 200. The sealing cavity 220 communicates with the hollow part 210 to form a through space that penetrates the pump cover 200. That is, the end of the sealing cavity 220 away from the hollow part 210 forms an opening for the motor shaft 410 of the drive motor 400 to pass through. The through space formed by the sealing cavity 220 and the hollow part 210 is used for the motor shaft 410 of the drive motor 400 of the double suction pump to pass through the pump cover 200 and extend into the water pressure chamber 150 to connect with the double suction impeller 300 of the double suction pump. The sealing cavity 220 is used to accommodate the sealing device 500. The sealing device 500 is used to seal the gap between the motor shaft 410 and the pump cover 200. The sealing device 500 enables the motor shaft 410 and the pump cover 200 to rotate relative to each other and have a sealed fit.

[0053] It is foreseeable that the housing of the drive motor 400 may have a protruding structure around the motor shaft 410, resulting in an increase in the axial dimension of the double-suction pump. Therefore, in one embodiment of this application, the end face of the pump cover 200 away from the first suction chamber 160 is provided with a clearance groove 240 to avoid the drive motor 400 of the double-suction pump, and / or, the end face of the pump housing 100 away from the first suction chamber 160 is provided with a clearance groove 240 to avoid the drive motor 400 of the double-suction pump. That is, depending on the shape and position of the protruding structure on the housing of the drive motor 400, a clearance groove 240 can be provided on the pump housing 100, or on the pump cover 200, or the pump housing 100 and the pump cover 200 can cooperate to form a clearance groove 240, thereby shortening the axial length of the double-suction pump and making the double-suction pump structure more compact. Figure 4 As shown, in one embodiment of this application, the avoidance trough 240 is disposed on the pump cover 200.

[0054] To facilitate the assembly of the pump cover 200 and the pump housing 100, and to facilitate the formation of a seal between the pump cover 200 and the pump housing 100, in one embodiment of this application, please refer to... Figures 3 to 6 A first annular step surface 231 is provided on the outer peripheral surface of the end of the pump cover 200 away from the first suction chamber 160. The first annular step surface 231 faces the first suction chamber 160. That is, an annular boss 230 is provided on the outer peripheral surface of the end of the pump cover 200 away from the first suction chamber 160. The annular surface of the annular boss 230 facing the first suction chamber 160 is the first annular step surface 231.

[0055] Please see Figure 2 and Figure 6 A second annular stepped surface 171 is provided on the inner circumferential surface of the end of the mounting cavity 140 away from the first suction cavity 160. The second annular stepped surface 171 faces away from the first suction cavity 160. That is, an annular groove 170 adapted to the annular boss 230 is provided on the inner circumferential surface of the end of the mounting cavity 140 away from the first suction cavity 160. The annular bottom surface of the annular groove 170 facing away from the first suction cavity 160 is the second annular stepped surface 171. When the pump housing 100 and the pump cover 200 are assembled together, the annular boss 230 is embedded in the annular groove 170, and the first annular stepped surface 231 and the second annular stepped surface 171 contact and cooperate to limit the pump cover 200. At the same time, the first annular stepped surface 231 and the second annular stepped surface 171 clamp the sealing member 600 to achieve a seal between the pump cover 200 and the pump housing 100.

[0056] Of course, in addition to providing a sealing member 600 between the first annular step surface 231 and the second annular step surface 171, a sealing member 600 can also be provided between the outer peripheral surface of the annular boss 230 and the inner peripheral surface of the annular groove 170, which is not limited here.

[0057] A sealing groove 172 is provided on at least one of the first annular stepped surface 231 and the second annular stepped surface 171. An O-ring, serving as a sealing member 600, is embedded in the sealing groove 172. When the first annular stepped surface 231 and the second annular stepped surface 171 come into contact, the O-ring is clamped to achieve a seal. Figure 2 As shown, in one embodiment of this application, the second annular step surface 171 is provided with a sealing groove 172. It should be noted that one or more sealing grooves 172 can be provided on the second annular step surface 171. When multiple sealing grooves 172 are provided, each sealing groove 172 is arranged in a concentric circle.

[0058] Please see Figure 3 and Figure 4The hollowed-out portion 210 includes a molding compensation portion 211 and a first transition connection portion 212. The molding compensation portion 211 cooperates with the cavity wall of the mounting cavity 140 to form a second water absorption cavity. The first transition connection portion 212 is used to connect the molding compensation portion 211 with the water pressure cavity 150. The sealing cavity 220 is disposed on the side of the molding compensation portion 211 away from the first transition connection portion 212.

[0059] Specifically, such as Figure 4 As shown, the first transition connection 212 includes a first guide portion 2121, a first mating portion 2122, and a first clearance portion 2123 arranged sequentially from near to far relative to the molding compensation portion 211. The first guide portion 2121 is surrounded by a smooth curved surface. The longitudinal contour line of the first guide portion 2121 is a smooth curve protruding towards the axis of the first transition connection 212. The longitudinal contour line of the first guide portion 2121 is the intersection line of the plane passing through the axis of the first transition connection 212 and the first guide portion 2121, so that the first guide portion 2121 and the wall surface of the molding compensation portion 211 are smoothly connected. This can reduce the resistance when the water in the second water suction chamber flows to the pressure chamber 150.

[0060] Please continue reading. Figure 4 The first mating part 2122 is used for rotatable sealing mating with the first inlet 110 end of the double-suction impeller 300 of the double-suction pump, from Figure 4 As can be seen, an annular stepped surface of the back-forming compensation part 211 is formed between the first mating part 2122 and the first flow guide part 2121. This annular stepped surface can contact and fit with the end face of the first inlet 110 end of the double-suction impeller 300 of the double-suction pump, the end face of the impeller sealing ring, and the end face of the pump body sealing ring. This not only achieves axial positioning of the double-suction impeller 300, the impeller sealing ring, and the pump body sealing ring, but also allows the inner surface of the first inlet 110 end of the double-suction impeller 300 to smoothly transition and connect with the surface of the first flow guide part 2121, avoiding the formation of a stepped structure between the first flow guide part 2121 and the double-suction impeller 300, and preventing turbulence from forming at this location.

[0061] The first clearance part 2123 is used to avoid the double-suction impeller 300 of the double-suction pump, so as to prevent the pump cover 200 from affecting the rotation of the double-suction impeller 300, such as Figure 4 As shown, the first clearance part 2123 has a rounded chamfer.

[0062] Please see Figure 2Corresponding to the first transition connection 212 mentioned above, a second transition connection is provided in the inner cavity of the pump casing 100 between the first suction chamber 160 and the pressure chamber 150. The structure of the second transition connection is the same as that of the first transition connection 212. The second transition connection includes a second guide part 181, a second mating part 182, and a second clearance part 190 arranged sequentially from near to far from the first suction chamber 160. The second guide part 181 is surrounded by a smooth curved surface so that the second guide part 181 and the wall of the first suction chamber 160 are smoothly connected. The second mating part 182 is used to rotatably seal with the second inlet 110 end of the double suction impeller 300 of the double suction pump. The second clearance part 190 is used to avoid the double suction impeller 300 of the double suction pump.

[0063] The second mating part 182 is used for a rotatable sealing fit with the second inlet 110 end of the double-suction impeller 300 of the double-suction pump, from... Figure 4 As can be seen, an annular stepped surface is formed between the second mating part 182 and the second guide part 181, facing away from the first suction chamber 160. This annular stepped surface can contact and fit with the end face of the second inlet 110 end of the double suction impeller 300 of the double suction pump, the end face of the impeller sealing ring, and the end face of the pump body sealing ring, thereby achieving axial positioning of the double suction impeller 300, the impeller sealing ring, and the pump body sealing ring, and making the inner surface of the second inlet 110 end of the double suction impeller 300 smoothly transition and connect with the surface of the second guide part 181, avoiding the formation of a stepped structure between the second guide part 181 and the double suction impeller 300, and avoiding the formation of turbulence at this location.

[0064] Further optimize the above technical solutions, such as Figure 2 As shown, the pump casing 100 includes a casing body and a transition member 180. The transition member 180 is detachably disposed inside the casing body. The second flow guide 181 and the second mating part 182 are disposed on the transition member 180, and the second clearance part 190 is disposed on the casing body to facilitate the manufacturing and processing of the casing body. Of course, in other embodiments, the second flow guide 181, the second mating part 182 and the second clearance part 190 can all be disposed on the transition member 180.

[0065] This application also provides a dual-suction pump; please refer to [link / reference]. Figure 5 and Figure 6 The dual-suction pump includes a dual-suction pump body, a dual-suction impeller 300, and a drive motor 400. The dual-suction pump body is as described in the above embodiment. The dual-suction impeller 300 is rotatably disposed in the pressure chamber 150 of the dual-suction pump body. The motor shaft 410 of the drive motor 400 extends into the dual-suction pump body and is connected to the dual-suction impeller 300. Since this dual-suction pump uses the dual-suction pump body described in the above embodiment, the technical effects of this dual-suction pump are explained in the above embodiment.

[0066] Preferably, in one embodiment of this application, the drive motor 400 is an axial flux motor. The axial dimension of the axial flux motor is small, which can make the structure of the double suction pump more compact, reduce the volume of the double suction pump, and reduce the weight of the double suction pump.

[0067] To simplify the assembly and connection structure of the double-suction pump, such as Figure 6 As shown, the housing of the drive motor 400 is detachably connected to the pump housing 100 of the double-suction pump body on the mounting port 130 side, and presses and fixes the pump cover 200 of the double-suction pump body to the pump housing 100 of the double-suction pump body, thereby avoiding the setting of weak links such as flanges and bolts between the pump cover 200 and the pump housing 100, and avoiding leakage caused by vibration or pressure.

[0068] Based on the above installation method, in one embodiment of this application, such as Figure 5 and Figure 6 As shown, the sealing device 500 includes a mechanical seal cover 520, a mechanical seal O-ring 530, and a mechanical seal 510. During installation, the double-suction impeller 300, pump cover 200, mechanical seal 510, and mechanical seal cover 520 are sequentially fitted onto the motor shaft 410 of the drive motor 400. The mechanical seal O-ring 530 is fitted onto the mechanical seal cover 520. Then, the housing of the drive motor 400 is connected to the pump housing 100 with bolts. At this time, the housing of the drive motor 400 can press and fix the pump cover 200 to the housing. At the same time, the housing of the drive motor 400 presses the mechanical seal 510 through the mechanical seal cover 520. The mechanical seal O-ring 530 is used to seal the gap between the mechanical seal cover 520 and the pump cover 200, and the mechanical seal 510 is used to seal the gap between the pump cover 200 and the motor shaft 410 of the drive motor 400. It is evident that the dual-suction pump provided in this application has a simple assembly structure and requires fewer flanges and bolts. It is not only easy to assemble and disassemble, but also effectively avoids leakage caused by vibration or pressure due to the reduction of weak links such as flanges and bolts.

[0069] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0070] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0071] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0072] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A double-suction pump body, characterized in that, include: The pump housing (100) has an inner cavity comprising a mounting cavity (140), a pressure chamber (150), and a first suction chamber (160) connected in sequence. The pump housing (100) is provided with an inlet (110), an outlet (120), and a mounting port (130). The mounting port (130) is connected to the mounting cavity (140). The first suction chamber (160) is connected to both the inlet (110) and the pressure chamber (150). The pressure chamber (150) is connected to the outlet (120). The pump cover (200) is detachably and sealingly connected to the pump housing (100) at the mounting port (130), and the pump cover (200) is at least partially fitted into the mounting cavity (140). The portion of the pump cover (200) inserted into the mounting cavity (140) is provided with a hollow part (210). The hollow part (210) and the cavity wall of the mounting cavity (140) cooperate to form a second water suction cavity. The second water suction cavity is connected to the inlet (110) and the pressure chamber (150) respectively.

2. The double-suction pump body according to claim 1, characterized in that, A sealing cavity (220) is provided on the pump cover (200). The sealing cavity (220) communicates with the hollow part (210) to form a through space through the pump cover (200). The through space is used for the motor shaft (410) of the drive motor (400) of the double suction pump to pass through the pump cover (200) and extend into the water pressure chamber (150) to connect with the double suction impeller (300) of the double suction pump. The sealing cavity (220) is used to accommodate the sealing device (500). The sealing device (500) is used to seal the gap between the motor shaft (410) and the pump cover (200).

3. The double-suction pump body according to claim 2, characterized in that, The pump cover (200) is provided with a clearance groove (240) on the end face away from the first suction chamber (160) to avoid the drive motor (400) of the double suction pump, and / or the pump housing (100) is provided with a clearance groove (240) on the end face away from the first suction chamber (160) to avoid the drive motor (400) of the double suction pump.

4. The double-suction pump body according to any one of claims 1-3, characterized in that, The pump cover (200) has a first annular step surface (231) on its outer peripheral surface at the end away from the first suction chamber (160). The first annular step surface (231) faces the first suction chamber (160). The mounting cavity (140) has a second annular step surface (171) on its inner peripheral surface at the end away from the first suction chamber (160). The second annular step surface (171) faces away from the first suction chamber (160). The first annular step surface (231) and the second annular step surface (171) clamp the sealing member (600).

5. The double-suction pump body according to any one of claims 1-3, characterized in that, The hollowed-out portion (210) includes a molding compensation portion (211) and a first transition connection portion (212). The molding compensation portion (211) cooperates with the cavity wall of the mounting cavity (140) to form the second water absorption cavity. The first transition connection portion (212) is used to connect the molding compensation portion (211) with the water pressure cavity (150).

6. The double-suction pump body according to claim 5, characterized in that, The first transition connection part (212) includes a first guide part (2121), a first mating part (2122), and a first clearance part (2123) arranged in sequence from near to far relative to the molding compensation part (211). The first guide part (2121) is surrounded by a smooth curved surface so that the first guide part (2121) and the wall surface of the molding compensation part (211) are smoothly connected. The first mating part (2122) is used to rotatably seal with the first inlet (110) end of the double suction impeller (300) of the double suction pump. The first clearance part (2123) is used to avoid the double suction impeller (300) of the double suction pump.

7. The double-suction pump body according to any one of claims 1-3, characterized in that, The inner cavity of the pump casing (100) is provided with a second transition connection between the first suction chamber (160) and the pressure chamber (150). The second transition connection includes a second guide part (181), a second mating part (182), and a second clearance part (190) arranged in sequence from near to far relative to the first suction chamber (160). The second guide part (181) is surrounded by a smooth curved surface so that the second guide part (181) is smoothly connected to the wall of the first suction chamber (160). The second mating part (182) is used to rotatably seal with the second inlet (110) end of the double suction impeller (300) of the double suction pump. The second clearance part (190) is used to avoid the double suction impeller (300) of the double suction pump.

8. The double-suction pump body according to claim 7, characterized in that, The pump casing (100) includes a casing body and a transition member (180). The transition member (180) is detachably disposed inside the casing body. The second flow guide (181) and the second mating part (182) are disposed on the transition member (180).

9. A double-suction pump, characterized in that, include: A dual-suction pump body, wherein the dual-suction pump body is the dual-suction pump body as described in any one of claims 1-8; The double-suction impeller (300) is rotatably disposed in the pressure chamber (150) of the double-suction pump body; A drive motor (400) has its motor shaft (410) extending into the body of the double-suction pump and connected to the double-suction impeller (300).

10. The dual-suction pump according to claim 9, characterized in that, The drive motor (400) is an axial flux motor.

11. The double-suction pump according to claim 9 or 10, characterized in that, The housing of the drive motor (400) is detachably connected to the pump housing (100) of the double suction pump body on the mounting port (130) side, and presses and fixes the pump cover (200) of the double suction pump body to the pump housing (100).

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