Water pumps and pumping stations

Abstract

The embodiment of the present application provides a water pump and a pump station, which relates to the field of fluid machinery technology. The water pump includes a pump casing, an impeller, a pump shaft and a seal. The pump casing has a receiving chamber, the impeller is arranged in the receiving chamber, the pump shaft is rotatably inserted on the pump casing, part of the pump shaft is located in the receiving chamber to connect with the impeller, and the seal is sleeved on the part of the pump shaft located in the receiving chamber; there are at least a first chamber and a second chamber between the side of the impeller facing the seal and the pump casing, the seal is located in the first chamber, the second chamber is sleeved outside the first chamber, the first chamber is connected to the second chamber, and the second chamber is connected to the receiving chamber. When the impeller rotates, the kinetic energy of the liquid in the first chamber is basically zero, and the impurities in the first chamber will not continue to wear the seal with the flow of the liquid, thereby preventing the seal from being damaged or even failing due to wear by impurities.

Description

Technical Field

[0001] The present application relates to the technical field of fluid machinery, and in particular to a water pump and a pump station. Background Art

[0002] A water pump is a device used to transport liquids or increase the volume of liquids. It can be divided into volumetric pumps, vane pumps and fluid dynamic pumps, etc., and is widely used in various water conservancy systems.

[0003] A vane pump, especially a centrifugal pump, includes a pump casing, an impeller and a pump shaft. The impeller is arranged in the pump casing through the rotation of the pump shaft. The impeller has a flow channel. The water inlet and outlet of the pump casing are connected through the flow channel, and a chamber is formed between the impeller and the pump casing. The seal of the pump shaft is located in the chamber, and the chamber is connected to the flow channel through the matching gap between the impeller and the pump casing. The pump shaft drives the impeller to rotate in the pump casing, so that water passes through the flow channel from the water inlet end, fills the inside of the pump casing and the chamber, and is discharged from the water outlet end.

[0004] However, when the water contains impurities, the impurities will enter the chamber and continue to wear the seal with the water flow, causing damage to the seal or even failure. Summary of the invention

[0005] The embodiments of the present application provide a water pump and a pump station to solve the problem that impurities in the water enter the chamber, wear the seal, and cause the seal to be damaged or even fail.

[0006] In a first aspect, an embodiment of the present application provides a water pump, including a pump housing, an impeller, a pump shaft and a seal, wherein the pump housing has a receiving cavity, the impeller is disposed in the receiving cavity, the pump shaft is rotatably inserted in the pump housing, a portion of the pump shaft is located in the receiving cavity to be connected to the impeller, and the seal is sleeved on the portion of the pump shaft located in the receiving cavity;

[0007] There are at least a first chamber and a second chamber between the side of the impeller facing the seal and the pump casing. The seal is located in the first chamber, the second chamber is sleeved outside the first chamber, the first chamber is communicated with the second chamber, and the second chamber is communicated with the accommodating chamber.

[0008] In a possible implementation, in the water pump provided by the embodiment of the present application, at least a first mouth ring and a second mouth ring are coaxially arranged on the side of the impeller facing the seal, the first mouth ring and the pump casing form a first chamber, and the second mouth ring and the pump casing form a second chamber.

[0009] In a possible implementation, in the water pump provided in the embodiment of the present application, the first mouth ring and the second mouth ring are both matched with the gap of the pump casing, the first chamber is connected to the second chamber through the gap between the first mouth ring and the pump casing, and the second chamber is connected to the accommodating chamber through the gap between the second mouth ring and the pump casing.

[0010] In a possible implementation, in the water pump provided in the embodiment of the present application, the gap between the first mouth ring and the pump casing is greater than the gap between the second mouth ring and the pump casing.

[0011] In a possible implementation, the water pump provided in the embodiment of the present application has a first mating ring and a second mating ring disposed on the pump housing, the first mating ring having a corresponding clearance fit with the first opening ring, and the second mating ring having a corresponding clearance fit with the second opening ring.

[0012] In a possible implementation manner, the water pump provided in the embodiment of the present application, the first port ring is provided with a first step surface, the second port ring is provided with a second step surface, the first mating ring is provided with a first mating surface, and the second mating ring is provided with a second mating surface;

[0013] The first step surface is clearance-matched with the first matching surface, and the second step surface is clearance-matched with the second matching surface.

[0014] In a possible implementation, in the water pump provided in the embodiment of the present application, a balancing hole is provided on the impeller, and the first chamber is connected to the accommodating chamber through the balancing hole.

[0015] In a possible implementation, in the water pump provided in the embodiment of the present application, the area of ​​the balancing hole is larger than the communication area between the first chamber and the second chamber.

[0016] In a possible implementation manner, the water pump provided in the embodiment of the present application has a water suction port and a water discharge port on the pump casing, the impeller divides the accommodating chamber into a water suction chamber and a water discharge chamber, the water suction chamber is connected to the water suction port, the water discharge chamber is connected to the water discharge port, the impeller has a flow channel, and the water suction chamber and the water discharge chamber are connected through the flow channel;

[0017] The second chamber is communicated with the drainage chamber, and the balance hole is communicated with the water absorption chamber through a flow channel.

[0018] In a second aspect, an embodiment of the present application provides a pump station, comprising a pump station body and at least one of the above-mentioned water pumps, wherein the water pump is disposed in the pump station body.

[0019] The beneficial effects of the present invention are as follows: the water pump and pump station provided by the embodiment of the present application, the water pump includes a pump housing, an impeller, a pump shaft and a seal, the impeller is arranged in the accommodating chamber of the pump housing through the rotation of the pump shaft, and a first chamber and a second chamber are formed between the impeller and the pump housing, and a seal for ensuring the sealing performance between the pump shaft and the pump housing is sleeved on the pump shaft, and the seal is located in the first chamber to ensure the sealing performance between the pump shaft and the pump housing. Since the seal is located in the first chamber, the first chamber is connected to the second chamber, and the second chamber is connected to the accommodating chamber, when the water pump is running, the liquid enters the first chamber through the accommodating chamber and the second chamber in turn, and fills the accommodating chamber, the second chamber and the first chamber, based on the linear velocity of the pump shaft at the center of the impeller being less than the linear velocity of the edge of the impeller, the accommodating chamber, the second chamber and the first chamber are successively close to the pump shaft at the center of the impeller, so that the kinetic energy and pressure of the liquid in the accommodating chamber near the second chamber, in the second chamber and in the first chamber are respectively reduced in turn, and the kinetic energy of the liquid in the first chamber is substantially zero. Furthermore, when the impeller rotates, the kinetic energy of the liquid in the first chamber is substantially zero, and the impurities in the first chamber will not continue to wear the seal as the liquid flows, thereby preventing the seal from being damaged or even failing due to wear by the impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1 A schematic diagram of the structure of a water pump provided in an embodiment of the present application;

[0022] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0023] Description of reference numerals:

[0024] 100-pump housing; 110-pump body; 120-pump cover; 130-accommodating chamber; 131-water suction chamber; 132-drainage chamber; 140-first chamber; 141-first matching ring; 1411-first matching surface; 150-second chamber; 151-second matching ring; 1511-second matching surface; 160-water suction port; 170-drainage port;

[0025] 200- impeller; 210- first mouth ring; 211- first step surface; 220- second mouth ring; 221- second step surface; 230- wheel body; 231- flow channel; 240- balance hole;

[0026] 300- pump shaft;

[0027] 400-driving machine;

[0028] 500 - Seals.

[0029] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0031] As described in the background technology, some vane pumps, especially centrifugal pumps, include a pump casing, an impeller and a pump shaft. The impeller is arranged in the pump casing through the rotation of the pump shaft. The impeller has a flow channel. The water inlet and outlet of the pump casing are connected through the flow channel, and a chamber is formed between the impeller and the pump casing. The seal of the pump shaft is located in the chamber, and the chamber is connected to the flow channel through the matching gap between the impeller and the pump casing. The pump shaft drives the impeller to rotate in the pump casing, so that water passes through the flow channel from the water inlet end, fills the inside of the pump casing and the chamber, and is discharged from the water outlet end.

[0032] However, when the water contains impurities, the impurities will enter the chamber with the water flow, and as the impeller rotates, the water flow in the chamber has greater kinetic energy, causing the impurities in the water flow to continuously wear the seal, causing the seal to be damaged or even fail.

[0033] At the same time, part of the water flows into the chamber and then flows back, which will also reduce the amount of water discharged from the pump, resulting in a decrease in the pump's delivery efficiency. In addition, as the impeller rotates to absorb water and the water flows in the chamber, the pressure on the side of the impeller facing the chamber will be greater than the pressure on the side of the impeller facing away from the chamber, that is, the pressure on the side of the impeller facing the seal is greater than the pressure on the side of the impeller away from the seal, resulting in poor axial balance of the impeller.

[0034] In order to overcome the defects in the prior art, the present application provides a water pump and a pump station. The water pump includes a pump casing, an impeller, a pump shaft and a seal. A first chamber and a second chamber are formed between the impeller and the pump casing. The seal is sleeved on the pump shaft and is located in the first chamber. The first chamber is connected to the second chamber, and the second chamber is connected to the accommodating chamber of the pump casing. When the water pump is running, the kinetic energy and pressure of the liquid in the accommodating chamber near the second chamber, in the second chamber and in the first chamber respectively decrease successively, and the kinetic energy of the liquid in the first chamber is basically zero. Furthermore, when the impeller rotates, the kinetic energy of the liquid in the first chamber is basically zero, and the impurities in the first chamber will not continue to wear the seal with the flow of the liquid, thereby preventing the seal from being damaged or even failing due to wear by impurities.

[0035] The content of the present invention will be described in detail below in conjunction with the accompanying drawings so that those skilled in the art can understand the content of the present invention more clearly and in detail.

[0036] Reference Figure 1 and Figure 2 As shown, the embodiment of the present application provides a water pump, including a pump housing 100, an impeller 200, a pump shaft 300 and a sealing member 500, wherein the pump housing 100 has an accommodating chamber 130, the impeller 200 is disposed in the accommodating chamber 130, the pump shaft 300 is rotatably inserted in the pump housing 100, a portion of the pump shaft 300 is located in the accommodating chamber 130 to be connected with the impeller 200, and the sealing member 500 is sleeved on a portion of the pump shaft 300 located in the accommodating chamber 130;

[0037] There is at least a first chamber 140 and a second chamber 150 between the impeller 200 and the pump casing 100 on one side facing the seal 500. The seal 500 is located in the first chamber 140, and the second chamber 150 is arranged outside the first chamber 140. The first chamber 140 is connected to the second chamber 150, and the second chamber 150 is connected to the accommodating chamber 130.

[0038] It can be understood that the water pump provided in the embodiment of the present application is a vane pump, specifically a centrifugal pump. The pump housing 100 includes a pump body 110 and a pump cover 120, the pump body 110 and the pump cover 120 are detachably connected by bolts, and an accommodating chamber 130 is formed between the pump body 110 and the pump cover 120, the accommodating chamber 130 is used to accommodate the impeller 200, and water can flow through.

[0039] In this embodiment, a mounting hole is provided on the pump cover 120, and a driving machine 400 is installed in the pump cover 120. The driving machine 400 can be a motor or a fuel engine. The pump shaft 300 is connected to the output end of the driving machine 400, and the pump shaft 300 is rotatably connected to the mounting hole. A sealing ring is provided between the pump shaft 300 and the mounting hole to ensure the sealing between the pump shaft 300 and the pump cover 120. The pump shaft 300 is partially located in the accommodating chamber 130 through the mounting hole. The impeller 200 is connected to the end of the pump shaft 300 through a key, so that the impeller 200 rotates in the accommodating chamber 130 driven by the pump shaft 300. The end face of the impeller 200 that is away from the pump shaft 300 is pressed against the pump body 110 through a sealing ring to ensure the sealing of the connection between the impeller 200 and the pump body 110, and the accommodating chamber 130 in the pump housing 100 can be divided into a water suction chamber 131 and a drainage chamber 132 by the impeller 200. The pump body 110 is provided with a water suction port 160 and a water discharge port 170. The water suction port 160 is connected to the end of the impeller 200 away from the pump shaft 300 through the water suction chamber 131, and the water discharge port 170 is connected to the side of the impeller 200 through the water discharge chamber 132. The impeller 200 is provided with a flow channel 231 through the blade structure on the wheel body 230, and the water suction chamber 131 is connected to the water discharge chamber 132 through the flow channel 231, so that when the impeller 200 rotates, water can be sucked into the water suction chamber 131 from the water suction port 160, and the water can fill the water discharge chamber 132, the first chamber 140 and the second chamber 150 from the flow channel 231, and further the water can be discharged from the water discharge port 170.

[0040] The seal 500 is sleeved on the part of the pump shaft 300 between the impeller 200 and the pump housing 100, so that the seal 500 can ensure the sealing of the part of the pump shaft 300 and avoid the sealing failure of the part of the pump shaft 300. The seal 500 is specifically a mechanical seal structure, which will not be described in detail here.

[0041] In this way, a first chamber 140 and a second chamber 150 are formed on the side of the impeller 200 facing the seal 500. The seal 500 is located in the first chamber 140, and the second chamber 150 is located outside the first chamber 140 and is connected to the first chamber 140. The second chamber 150 is also connected to the accommodating chamber 130. Specifically, the second chamber 150 is connected to the drainage chamber 132, so that the sealing performance of the seal 500 can be ensured through the first chamber 140 and the second chamber 150.

[0042] Since the seal 500 is located in the first chamber 140, the first chamber 140 is connected to the second chamber 150, and the second chamber 150 is connected to the accommodating chamber 130, when the water pump is running, the liquid enters the first chamber 140 through the accommodating chamber 130 and the second chamber 150 in turn, and fills the accommodating chamber 130, the second chamber 150 and the first chamber 140.

[0043] Based on the rotation of the impeller 200, the linear velocity of the pump shaft 300 at the center of the impeller 200 must be smaller than the linear velocity of the edge of the impeller 200, and the drainage chamber 132, the second chamber 150 and the first chamber 140 are successively close to the pump shaft 300 at the center of the impeller 200, so that the internal liquid kinetic energy and pressure of the drainage chamber 132, the second chamber 150 and the first chamber 140 respectively decrease successively as they approach the pump shaft 300, and the liquid kinetic energy in the first chamber 140 is basically zero.

[0044] Furthermore, when the impeller 200 rotates, the kinetic energy of the liquid in the first chamber 140 is substantially zero, and the impurities in the first chamber 140 are substantially settled at the bottom of the first chamber 140, and will not continuously wear the seal 500 with the flow of the liquid, thereby preventing the seal 500 from being damaged or even failing due to wear by the impurities.

[0045] Compared with the prior art, in which the water pump has only one chamber on the side of the impeller 200 facing the seal 500, and the seal 500 is located in one chamber, the water pump provided in the embodiment of the present application has an additional chamber to form a composite chamber structure of a first chamber 140 and a second chamber 150, thereby effectively reducing the kinetic energy and pressure of the liquid entering the chamber for a second time, thereby reducing the liquid pressure in the first chamber 140 and making the kinetic energy of the liquid in the first chamber 140 basically zero, thereby avoiding the problem of the seal 500 being worn by impurities flowing with the liquid.

[0046] In other embodiments, a third chamber or even a fourth chamber may be additionally formed on the outside of the second chamber 150, so that the chamber structure of the impeller 200 is more complex, further improving the effect of reducing the kinetic energy and pressure of the liquid. The present application does not limit this. The following only takes the water pump structure with the first chamber 140 and the second chamber 150 as an example to illustrate the water pump provided by the present application.

[0047] Furthermore, the present application increases the number of chambers relatively by providing a first chamber 140 and a second chamber 150, thereby extending the flow path of the liquid in the chamber, thereby reducing the possibility of liquid leakage in the chamber, further improving the delivery efficiency of the water pump, and ensuring the sealing performance of the seal 500.

[0048] At the same time, the multi-chamber structure also helps to balance the pressure on the side of the impeller 200 facing the seal 500, and because the pressure in the first chamber 140 is lower than that in the second chamber 150, and the pressure in the second chamber 150 is lower than that in the drainage chamber 132, the overall pressure on the side of the impeller 200 facing the seal 500 is reduced, which helps the impeller 200 balance the pressure on the side facing the seal 500 and the side facing away from the seal 500, thereby improving the axial balance of the impeller 200.

[0049] In some embodiments, reference Figure 1 and Figure 2 As shown, at least a first mouth ring 210 and a second mouth ring 220 are coaxially arranged on one side of the impeller 200 facing the seal 500 . The first mouth ring 210 and the pump housing 100 form a first chamber 140 , and the second mouth ring 220 and the pump housing 100 form a second chamber 150 .

[0050] It can be understood that the first mouth ring 210 and the second mouth ring 220 are both annular structures arranged on the side of the impeller 200 facing the seal 500, and are perpendicular to the impeller 200 and extend toward the pump housing 100. By arranging the coaxial first mouth ring 210 and the second mouth ring 220 on the side of the impeller 200 facing the seal 500, that is, the back of the impeller 200, it is convenient to ensure the stability of the connection between the impeller 200 and the pump housing 100 while the impeller 200 rotates.

[0051] The first mouth ring 210 and the second mouth ring 220 form a first chamber 140 and a second chamber 150 with the pump housing 100 respectively, and can also ensure the stability of the structure of the first chamber 140 and the second chamber 150 when the impeller 200 rotates, and avoid large fluctuations in the liquid pressure in the first chamber 140 and the second chamber 150.

[0052] Further, see Figure 1 and Figure 2 As shown, the first mouth ring 210 and the second mouth ring 220 are both loosely matched with the pump housing 100, the first chamber 140 is connected to the second chamber 150 through the gap between the first mouth ring 210 and the pump housing 100, and the second chamber 150 is connected to the accommodating chamber 130 through the gap between the second mouth ring 220 and the pump housing 100.

[0053] It can be understood that by setting the first mouth ring 210 and the second mouth ring 220 to fit with the pump housing 100 with a gap and connecting the chambers through the gap, the first mouth ring 210 and the second mouth ring 220 can be effectively assembled and connected to the pump housing 100, thereby avoiding vibration and friction caused by too close contact between the mouth rings and the pump housing 100.

[0054] It is also convenient for the liquid to flow through the gap in sequence through the second chamber 150 and the first chamber 140. Through the narrow gap, the leakage flow of the liquid can be effectively controlled to ensure sealing. The multi-stage pressure reduction effect can also be improved, making the liquid pressure and kinetic energy reduction effect in the first chamber 140 more significant than that in the second chamber 150.

[0055] Furthermore, such an arrangement enables impurities in the liquid to enter the second chamber 150 and the first chamber 140 only through the gap, effectively isolating impurities with larger particles from entering the chamber, further reducing the wear of the seal 500.

[0056] In other embodiments, communicating holes may be provided on the first mouth ring 210 and the second mouth ring 220 so that the first chamber 140 is in communication with the second chamber 150 through the communicating holes, or the second chamber is in communication with the accommodating chamber 130 through the communicating holes.

[0057] In specific implementation, refer to Figure 1 and Figure 2 As shown, the gap between the first mouth ring 210 and the pump housing 100 is larger than the gap between the second mouth ring 220 and the pump housing 100. It can be understood that, with such a configuration, when the liquid enters the second chamber 150, the gap at the second mouth ring 220 can effectively block large particles of impurities, and the impurity content of the liquid entering the first chamber 140 and the second chamber 150 can be controlled. When the liquid enters the first chamber 140, since the kinetic energy of the liquid in the first chamber 140 is small, the gap at the first mouth ring 210 can be correspondingly increased, so that the liquid in the second chamber 150 flows to the first chamber 140. In this way, when the impeller 200 rotates, the liquid can continuously and stably enter the second chamber 150 from the drainage chamber 132, and enter the first chamber 140 from the second chamber 150.

[0058] Specifically, the gap L1 at the first mouth ring 210 can be set to be greater than or equal to 1.5 times the gap L2 at the second mouth ring 220. For example, the gap L1 of the first mouth ring 210 is 1.5 times the gap L2 of the second mouth ring 220, or the gap L1 of the first mouth ring 210 is 1.6, 1.7 or 1.8 times the gap L2 of the second mouth ring 220. The present application does not impose any restrictions on this.

[0059] In some embodiments, reference Figure 1 and Figure 2 As shown, a first matching ring 141 and a second matching ring 151 are provided on the pump housing 100 . The first matching ring 141 is gap-matched with the first opening ring 210 , and the second matching ring 151 is gap-matched with the second opening ring 220 .

[0060] By arranging the first matching ring 141 and the second matching ring 151 corresponding to the first mouth ring 210 and the second mouth ring 220 respectively on the pump cover 120, the matching between the first mouth ring 210 and the second mouth ring 220 and the pump housing 100 can be made more stable and reliable, effectively avoiding the radial movement or shaking of the impeller 200, and ensuring the radial stability of the impeller 200. The matching between the mouth ring and the matching ring can also further ensure the structural stability of the first chamber 140 and the second chamber 150, thereby ensuring the reliability of the sealing member 500 and reducing the liquid leakage at the mouth ring.

[0061] In specific implementation, refer to Figure 1 and Figure 2As shown, the first mouth ring 210 is provided with a first step surface 211, the second mouth ring 220 is provided with a second step surface 221, the first matching ring 141 is provided with a first matching surface 1411, and the second matching ring 151 is provided with a second matching surface 1511;

[0062] The first step surface 211 is clearance-fitted with the first matching surface 1411 , and the second step surface 221 is clearance-fitted with the second matching surface 1511 .

[0063] In this embodiment, the first step surface 211 and the second step surface 221 are both facing the inner side of the first mouth ring 210 and the second mouth ring 220, and the first matching surface 1411 and the second matching surface 1511 are both located on the outer side of the first matching ring 141 and the second matching ring 151, and are respectively step surface structures adapted to the first step surface 211 and the second step surface 221. In other embodiments, the relative positions of the step surface on the mouth ring and the matching surface on the matching ring can also be exchanged, and this application does not limit this.

[0064] By providing a step surface and a matching surface adapted to the step surface to achieve clearance matching between the mouth ring and the matching ring, the mouth ring and the matching surface can form a matching relationship in both the axial and radial directions of the impeller 200, making the matching between the mouth ring and the matching surface more stable, tight and reliable. The leakage of the first chamber 140 and the second chamber 150 is further reduced, and the secondary pressure reduction effect of the second chamber 150 of the first chamber 140 is ensured, so as to reduce the kinetic energy of the liquid in the first chamber 140 and reduce the wear of the seal 500 by impurities in the liquid.

[0065] Furthermore, in some embodiments, a balancing hole 240 is provided on the impeller 200 , and the first chamber 140 is connected to the accommodating chamber 130 through the balancing hole 240 .

[0066] A balancing hole 240 is opened at a position of the wheel body 230 of the impeller 200 corresponding to the first chamber 140, and the balancing hole 240 connects the side of the wheel body 230 facing the seal 500 and the side of the wheel body 230 facing away from the seal 500, so that the first chamber 140 can be connected with the flow channel 231 through the balancing hole 240, and the flow channel 231 is also connected with the water absorption chamber 131, thereby realizing the connection between the first chamber 140 and the water absorption chamber 131.

[0067] By opening a balancing hole 240 on the impeller 200, impurities in the first chamber 140 can be discharged from the first chamber 140 through the balancing hole 240, thereby preventing impurities in the first chamber 140 from excessively accumulating and clogging the first chamber 140, ensuring the cleanliness of the first chamber 140 and effectively preventing the seal 500 from being worn by impurities.

[0068] At the same time, by opening the balancing hole 240, a complete liquid flow path can be formed between the water absorption chamber 131, the flow channel 231, the drainage chamber 132, the second chamber 150 and the first chamber 140. The liquid returns to the water absorption chamber 131 through the flow path, further reducing the liquid pressure of the impeller 200 on the side of the first chamber 140, effectively balancing the pressure between the side of the impeller 200 facing the seal 500 and the side of the impeller 200 away from the seal 500, and then balancing the axial force of the impeller 200, so that the rotation of the impeller 200 is more stable.

[0069] In a specific implementation, the area of ​​the balancing hole 240 is larger than the communication area between the first chamber 140 and the second chamber 150 .

[0070] By setting the area of ​​the balancing hole 240 to be larger than the gap area between the first mouth ring 210 and the first matching ring 141, the impurities in the first chamber 140 can be effectively guided to be discharged from the balancing hole 240 to the water absorption chamber 131, and will not flow back to the second chamber 150, thereby ensuring the consistency of liquid flow. Specifically, when the impeller 200 rotates, part of the liquid in the accommodating chamber 130 will carry the impurities along the water absorption chamber 131 through the flow channel 231 and enter the drainage chamber 132 in sequence, and enter the second chamber 150 from the drainage chamber 132, and then enter the first chamber 140 from the second chamber 150, and then enter the water absorption chamber 131 through the balancing hole 240. Since the area of ​​the balancing hole 240 is larger than the gap area between the first mouth ring 210 and the first matching ring 141, the area of ​​the balancing hole 240 is relatively large. Compared with the narrow area of ​​the matching gap between the first mouth ring 210 and the first matching ring 141, the larger the area of ​​the balancing hole 240, the greater the flow rate at the balancing hole 240, and the easier it is for impurities in the liquid to pass through. However, considering that the larger area of ​​the balancing hole 240 will cause a larger leakage of the water pump during operation, it is necessary to select a suitable size of the balancing hole 240 according to specific working conditions. In addition, based on the flow direction of the above-mentioned liquid, when the impurities are close to the gap between the first mouth ring 210 and the first matching ring 141, they will be flushed away by the liquid flowing from the second chamber 150 into the first chamber 140, so that the impurities cannot flow back from the first chamber 140 to the second chamber 150. In addition, the balancing hole 240 connects the water absorption chamber 131 and the first chamber 140. The kinetic energy of the liquid in the first chamber 140 is basically zero, but the liquid in the water absorption chamber 131 has a large kinetic energy driven by the impeller 200, which will also attract the liquid in the first chamber 140 to carry impurities from the balancing hole 240 to the water absorption chamber 131, thereby achieving the effect of guiding the impurities in the first chamber 140 to be discharged to the water absorption chamber 131.

[0071] Exemplarily, the area L3 of the balancing hole 240 can be greater than or equal to twice the gap area L1 of the first mouth ring 210, for example, the area L3 of the balancing hole 240 is twice the gap area L1 of the first mouth ring 210, or the area L3 of the balancing hole 240 is 2, 2.5 or 3 times the gap area L1 of the first mouth ring 210, and the present application does not impose any restrictions on this.

[0072] An embodiment of the present application also provides a pump station, including a pump station body and at least one water pump in any of the above embodiments, wherein the water pump is disposed in the pump station body.

[0073] The water pump has been described in detail in the above embodiments and will not be described in detail here.

[0074] The pump station provided in the embodiment of the present application, wherein the water pump thereof comprises a pump casing 100, an impeller 200, a pump shaft 300 and a seal 500. The impeller 200 is rotatably arranged in the accommodating cavity 130 of the pump casing 100 through the pump shaft 300, and a first chamber 140 and a second chamber 150 are formed between the impeller 200 and the pump casing 100. The seal 500 for ensuring the sealing performance between the pump shaft 300 and the pump casing 100 is sleeved on the pump shaft 300, and the seal 500 is located in the first chamber 140 to ensure the sealing performance between the pump shaft 300 and the pump casing 100.

[0075] Since the sealing member 500 is located in the first chamber 140, the first chamber 140 is communicated with the second chamber 150, and the second chamber 150 is communicated with the accommodating chamber 130, when the water pump is running, the liquid enters the first chamber 140 through the accommodating chamber 130 and the second chamber 150 in sequence, and fills the accommodating chamber 130, the second chamber 150 and the first chamber 140. Based on the fact that the linear velocity of the pump shaft 300 at the center of the impeller 200 is less than the linear velocity of the edge of the impeller 200, the accommodating chamber 130, the second chamber 150 and the first chamber 140 are respectively close to the pump shaft 300 at the center of the impeller 200, so that the kinetic energy and pressure of the liquid in the accommodating chamber 130 near the second chamber 150, the second chamber 150 and the first chamber 140 are respectively reduced in sequence, and the kinetic energy of the liquid in the first chamber 140 is substantially zero.

[0076] Furthermore, when the impeller 200 rotates, the kinetic energy of the liquid in the first chamber 140 is substantially zero, and the impurities in the first chamber 140 will not continue to wear the seal 500 with the flow of the liquid, thereby preventing the seal 500 from being damaged or even failing due to wear by the impurities.

[0077] Furthermore, the present application increases the number of chambers relatively by providing a first chamber 140 and a second chamber 150, thereby extending the flow path of the liquid in the chamber, thereby reducing the possibility of liquid leakage in the chamber, further improving the delivery efficiency of the water pump, and ensuring the sealing performance of the seal 500.

[0078] At the same time, the multi-chamber structure also helps to balance the pressure on the side of the impeller 200 facing the seal 500, and because the pressure in the first chamber 140 is lower than that in the second chamber 150, and the pressure in the second chamber 150 is lower than that in the drainage chamber 132, the overall pressure on the side of the impeller 200 facing the seal 500 is reduced, which helps the impeller 200 balance the pressure on the side facing the seal 500 and the side facing away from the seal 500, thereby improving the axial balance of the impeller 200.

[0079] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0080] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0081] It should be easily understood that the terms “on,” “above,” and “over” in this application should be interpreted in the broadest manner, so that “on” means not only “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above something” or “over,” but also may include the meaning of “above something” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0082] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90° or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water pump, characterized in that: The pump housing (100) comprises a pump housing (100), an impeller (200), a pump shaft (300) and a sealing member (500), wherein the pump housing (100) has a receiving cavity (130), the impeller (200) is arranged in the receiving cavity (130), the pump shaft (300) is rotatably inserted in the pump housing (100), a portion of the pump shaft (300) is located in the receiving cavity (130) to be connected to the impeller (200), and the sealing member (500) is sleeved on the portion of the pump shaft (300) located in the receiving cavity (130); At least a first chamber (140) and a second chamber (150) are provided between the side of the impeller (200) facing the sealing element (500) and the pump housing (100); the sealing element (500) is located in the first chamber (140); the second chamber (150) is sleeved outside the first chamber (140); the first chamber (140) is communicated with the second chamber (150); and the second chamber (150) is communicated with the accommodating chamber (130); At least a first mouth ring (210) and a second mouth ring (220) are coaxially arranged on one side of the impeller (200) facing the sealing element (500); the first mouth ring (210) and the pump casing (100) form the first chamber (140), and the second mouth ring (220) and the pump casing (100) form the second chamber (150); The first mouth ring (210) and the second mouth ring (220) are both loosely matched with the pump housing (100); the first chamber (140) is connected to the second chamber (150) via the gap between the first mouth ring (210) and the pump housing (100); and the second chamber (150) is connected to the accommodating chamber (130) via the gap between the second mouth ring (220) and the pump housing (100); The gap between the first mouth ring (210) and the pump housing (100) is greater than the gap between the second mouth ring (220) and the pump housing (100).

2. The water pump according to claim 1, characterized in that: The pump housing (100) is provided with a first matching ring (141) and a second matching ring (151); the first matching ring (141) and the first opening ring (210) are matched with a corresponding clearance, and the second matching ring (151) and the second opening ring (220) are matched with a corresponding clearance.

3. The water pump according to claim 2, characterized in that: The first mouth ring (210) is provided with a first step surface (211), the second mouth ring (220) is provided with a second step surface (221), the first matching ring (141) is provided with a first matching surface (1411), and the second matching ring (151) is provided with a second matching surface (1511); The first step surface (211) is clearance-fitted with the first matching surface (1411), and the second step surface (221) is clearance-fitted with the second matching surface (1511).

4. The water pump according to any one of claims 1 to 3, characterized in that: The impeller (200) is provided with a balancing hole (240), and the first chamber (140) is connected to the accommodating chamber (130) through the balancing hole (240).

5. The water pump according to claim 4, characterized in that: The area of ​​the balancing hole (240) is larger than the communication area between the first chamber (140) and the second chamber (150).

6. The water pump according to claim 4, characterized in that: The pump housing (100) is provided with a water suction port (160) and a water discharge port (170); the impeller (200) divides the accommodating chamber (130) into a water suction chamber (131) and a water discharge chamber (132); the water suction chamber (131) is in communication with the water suction port (160); the water discharge chamber (132) is in communication with the water discharge port (170); the impeller (200) has a flow channel (231); the water suction chamber (131) and the water discharge chamber (132) are in communication with each other via the flow channel (231); The second chamber (150) is in communication with the drainage chamber (132), and the balancing hole (240) is in communication with the water absorption chamber (131) through the flow channel (231).

7. A pumping station, characterized in that: It comprises a pump station body and at least one water pump as described in any one of claims 1 to 6, wherein the water pump is arranged in the pump station body.

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