Underwater spray pump for powered surfboard

Abstract

The utility model discloses an underwater spray pump for a jet powered surfboard, which comprises a mounting shell, a pump body and a nozzle, a water inlet runner is arranged in the mounting shell, a first shaft seat is arranged on the mounting shell, the pump body is detachably mounted on the mounting shell, the pump body comprises a pump shell and a propeller assembly, the propeller assembly is arranged in the pump shell, and the nozzle is arranged in the pump shell. The propeller assembly is connected with a transmission shaft, the transmission shaft penetrates out of the installation shell from the first shaft seat to be connected with an external driving device, the nozzle is detachably installed on the pump shell, the nozzle, the pump shell and the installation shell are all provided with fixing holes, fixing bolts are arranged in the fixing holes, a second shaft seat is arranged in the pump shell, and a flow deflector is arranged between the second shaft seat and the pump shell. The transmission shaft is supported through the first shaft seat and the second shaft seat, the vibration phenomenon is effectively avoided, the fixing holes and the fixing bolts in the mounting shell, the pump body and the nozzle are matched and fixed, only the fixing bolts are screwed off during disassembly and maintenance, disassembly and assembly are convenient, and the good maintenance performance of the spray pump is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of surfboards, in particular to an underwater jet pump for a power surfboard. Background Art

[0002] Surfing is a water sport in which athletes stand on a surfboard or use belly boards, kneeling boards, inflatable rubber mats, rowing boats, kayaks, etc. to control the waves. It is loved by people because of its thrills and effective physical exercise. With the development of society, powered surfboards have appeared on the market. Powered surfboards can travel in the absence of wind and waves and can be used in various waters. They effectively make up for the shortcomings of traditional non-powered surfboards, thereby making surfing a widespread sport.

[0003] Existing powered surfboards generally include a hull and a jet pump structure. The jet pump generally uses an electric motor or a fuel engine to drive the blades through a rotating shaft to drive the water flow backward, so that the surfboard can use the reverse thrust of the water to provide power for surfing. However, the jet pump structure as the power source is relatively complex and difficult to disassemble and maintain. In addition, the rotating shaft adopts a single-point support structure with a cantilever beam design. Due to the long rotating shaft, it is very easy to vibrate when running at high speed, which is not conducive to the smooth operation of the jet pump. Utility Model Content

[0004] The main purpose of the present invention is to overcome the defects of the above-mentioned background technology and provide an underwater jet pump for a power surfboard.

[0005] To achieve the above-mentioned purpose, the utility model proposes an underwater jet pump for a power surfboard, comprising a mounting shell, a pump body and a nozzle, wherein the mounting shell is provided with a water inlet flow channel, the mounting shell is provided with a first shaft seat, the pump body is detachably mounted on one end of the mounting shell and is connected to the outlet end of the water inlet flow channel, the pump body comprises a pump casing and a propeller assembly, the propeller assembly is arranged inside the pump casing, a transmission shaft is connected to the propeller assembly, the transmission shaft passes through the first shaft seat outside the mounting shell and is connected to an external driving device, the nozzle is detachably mounted on an end of the pump casing away from the mounting shell, the nozzle, the pump casing and the mounting shell are all provided with corresponding fixing holes, the fixing holes are provided with fixing bolts, a second shaft seat is provided at the axis center of the pump casing, a plurality of guide plates are provided between the second shaft seat and the pump casing, the front end of the transmission shaft is rotatably mounted on the second shaft seat through a first bearing group, a first sealing ring is provided on the rear side of the first bearing group, a second sealing ring and a second bearing group are provided on the first shaft seat, the first bearing group is provided with a second sealing ring and a second bearing group, the first bearing group is provided with a second sealing ring and a second bearing group, the first bearing group is provided with a second sealing ring and a second bearing group, the first bearing group is provided with a second sealing ring and a second bearing group, the first bearing group is provided with a second sealing ring and a second bearing group, the first bearing group is provided with a second sealing ring and a second bearing group, the first bearing group is provided with a second sealing ring and a second bearing group, the first bearing group is provided with a first ... A flange cover is provided on one side of the second bearing group. The second sealing ring is used to seal the gap between the mounting housing and the drive shaft to prevent water in the water inlet flow channel from entering the first shaft seat. The flange cover is used to press the second bearing group to prevent the second bearing group from withdrawing from the first shaft seat. The second shaft seat is used to support the end of the drive shaft, and the first shaft seat is used to support the middle part of the drive shaft, so that the drive shaft can be well supported, maintaining the stability of the drive shaft when running at high speed, effectively avoiding the occurrence of vibration, and the entire structure is more compact. The first sealing ring is used to isolate the lubricating oil working medium in the second shaft seat cavity and the water outside the cavity, thereby improving the rotational stability of the drive shaft. The guide vane is used to eliminate the circumferential velocity of the water flow, converting the rotational motion of the water flow into axial motion, thereby increasing the injection efficiency. By cooperating with the fixing hole and the fixing bolt, the fixing bolt passes through the nozzle and the side wall of the pump housing at the same time and is locked to the side wall of the mounting housing. The entire underwater spray pump adopts a split design with a compact structure. When the pump body needs to be disassembled for maintenance, it only needs to unscrew the fixing bolt, which is easy to disassemble and assemble, maintaining the good maintenance performance of the spray pump while effectively reducing the installation space.

[0006] To further optimize the technical solution, a guide cone is provided at one end of the second shaft seat near the nozzle. The guide cone is used to streamline the water at the pump body outlet into the nozzle, thereby reducing the resistance of the water flow and improving the efficiency of the spray pump.

[0007] To further optimize the technical solution, the pump casing sidewall is radially opened with a drain hole, and a connector is provided at the drain hole. The drain hole is used to exhaust air from the pump casing, ensuring that the spray pump can be filled with water. It is also used to drain water when the pump is shut down for maintenance to prevent long-term water accumulation in the pump body. During operation, the water is introduced into the area requiring circulating cooling through the pipe docking connector.

[0008] Further optimizing the technical solution, the propeller assembly includes propeller blades and a propeller hub. The propeller hub has a conical structure, and the propeller blades are fixed around the outer circumference of the propeller hub. The outer diameter of the cone bottom of the propeller hub is consistent with the outer diameter of the second shaft seat. The streamlined structure of the propeller hub with a conical structure further helps reduce water flow resistance and improve the efficiency of the jet pump.

[0009] A further optimized technical solution features an axial hole defined in the shaft of the propeller hub, a spline groove defined within the inner wall of the axial hole, a splined area corresponding to the spline groove, and a locking nut secured to the propeller hub within the splined area. The splined connection between the propeller hub and the propeller shaft allows for high torque tolerance, minimizes stress concentration, and provides excellent centering, effectively reducing vibration.

[0010] In a further optimized technical solution, the central axis hole is configured as a stepped hole structure, with the spline groove located in the smaller inner diameter section of the central axis hole. After the locking nut is tightened against the propeller hub, it can be retracted into the larger inner diameter section of the central axis hole. Once tightened, the locking nut is completely enclosed within the central axis hole, without affecting the streamlined shape between the propeller hub and the second shaft seat.

[0011] In a further optimized technical solution, the mounting housing is provided with an outer flange at the inlet end of the water inlet channel, and a plurality of mounting holes are formed on the outer flange. The arrangement of the outer flange and the mounting holes facilitates fixing the mounting housing to the surfboard.

[0012] To further optimize the technical solution, the second bearing group is two groups of angular contact ball bearings, and the two groups of angular contact ball bearings are arranged back to back to support and bear the axial load and radial load of the transmission shaft.

[0013] Further optimizing the technical solution, the nozzle is a tapered tube structure with a recessed outer surface corresponding to the fixing hole. The nozzle is used to converge the water flow and constrain the spray direction, converting the pressure energy of the water flow into kinetic energy and increasing the spray velocity.

[0014] To further optimize the technical solution, both the first sealing ring and the second sealing ring adopt mechanical seals. By adopting mechanical seals, a better sealing effect can be achieved under the action of fluid pressure and the elastic force of the compensation mechanism.

[0015] The beneficial effects of the present invention include: supporting the transmission shaft simultaneously by the first shaft seat and the second shaft seat, effectively avoiding the occurrence of vibration, maintaining the stability of the transmission shaft during high-speed operation, and making the entire structure more compact; by arranging corresponding fixing holes on the side walls of the mounting shell, the pump body and the nozzle, and cooperating with the fixing holes and the fixing bolts, the fixing bolts pass through the nozzle and the pump shell and are fixed to the mounting shell at the same time, so that the pump shell can be locked and fixed between the nozzle and the mounting shell. The overall structure adopts a split design. When the pump body needs to be disassembled for maintenance, it is only necessary to unscrew the fixing bolts. Disassembly and assembly are convenient, the good maintenance performance of the spray pump is maintained, and the installation space occupancy is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an exploded view of an underwater jet pump for a power surfboard in an embodiment of the present utility model.

[0017] Figure 2 It is an overall schematic diagram of an underwater jet pump for a power surfboard in an embodiment of the present utility model.

[0018] Figure 3 It is a schematic diagram of the pump casing in the embodiment of the present invention.

[0019] Figure 4 Schematic diagram of the propeller assembly in the embodiment of the present invention.

[0020] Figure 5 It is a schematic diagram of the installation shell in the embodiment of the utility model.

[0021] Figure numerals: 1 mounting shell; 101 water inlet channel; 102 first shaft seat; 103 outer flange; 104 mounting hole; 105 second sealing ring; 106 second bearing group; 107 flange cover; 2 pump body; 201 pump casing; 202 propeller assembly; 203 transmission shaft; 204 second shaft seat; 205 guide vane; 206 first bearing group; 207 first sealing ring; 208 guide cone cap; 209 drain hole; 2010 connector; 2011 propeller blade; 2012 blade hub; 2013 axial center hole; 2014 spline groove; 2015 spline area; 2016 locking nut; 3 nozzle; 301 clearance groove; 4 fixing hole; 5 fixing bolt. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and circuit connection.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0026] See also Figures 1 to 5In one embodiment, an underwater jet pump for a powered surfboard is disclosed, comprising a mounting housing 1, a pump body 2, and a nozzle 3. The mounting housing 1 is configured to be fixedly mounted to a surfboard (not shown). A water inlet passage 101 is provided within the mounting housing 1. A first shaft seat 102 is provided on the mounting housing 1. The pump body 2 is detachably mounted on one end of the mounting housing 1 and communicates with the outlet end of the water inlet passage 101. The pump body 2 comprises a pump housing 201 and a propeller assembly 202. The pump housing 201 is a hollow cylindrical structure. The propeller assembly 202 is disposed within the pump housing 201. A transmission shaft 203 is connected to the propeller assembly 202. The transmission shaft 203 is made of 3Cr13 material, and the surface of the transmission shaft 203 is nitrided after processing. Processing, so that it is suitable for high-speed, high-power working environments, the transmission shaft 203 passes through the first shaft seat 102 outside the mounting shell 1 and is connected to an external driving device (not shown). Specifically, the driving device adopts an electric motor or a fuel engine, and the transmission shaft 203 passes through the first shaft seat 102 along the outlet end of the water inlet channel 101 and extends along the first shaft seat 102 to the outside of the mounting shell 1. The nozzle 3 is detachably mounted on the end of the pump shell 201 away from the mounting shell 1, and corresponding fixing holes 4 are axially provided on the side walls of the nozzle 3, the pump shell 201 and the mounting shell 1. A fixing bolt 5 is provided in the fixing hole 4. The fixing bolt 5 is 6 groups of M10 hexagon socket bolts. The fixing bolt 5 is used to detach the nozzle 3, the pump shell 201 and The mounting housings 1 are connected and fixed together in series, and a cylindrical second shaft seat 204 is provided along the axis in the pump housing 201, and a number of guide vanes 205 are fixed between the second shaft seat 204 and the pump housing 201, and the guide vanes 205 are located on one side of the propeller assembly 202 (the side of the water flow direction), and the front end of the transmission shaft 203 is rotatably inserted and installed on the second shaft seat 204 through the first bearing group 206, and a first sealing ring 207 is provided on the rear side of the first bearing group 206. The second shaft seat 204 is used to support the end of the transmission shaft 203, and the first shaft seat 102 supports the middle part of the transmission shaft 203, so that the transmission shaft 203 can be well supported. The first bearing group 206 adopts a self-aligning ball bearing, and the first sealing ring 207 is used. In order to isolate the lubricating oil working medium in the cavity of the second shaft seat 204 and the water outside the cavity, the rotation stability of the transmission shaft 203 is improved. The guide plate 205 is used to eliminate the circumferential velocity of the water flow and convert the rotational motion of the water flow into axial motion. A second sealing ring 105 and a second bearing group 106 are provided on the first shaft seat 102. A flange cover 107 is provided on one side of the second bearing group 106. The second sealing ring 105 is used to seal and isolate the transmission shaft 203 from the water inlet channel 101 entering the hole between the first shaft seat 102 to prevent the water in the water inlet channel 101 from entering the first shaft seat 102 and affecting the internal bearing operation. The flange cover 107 is used to press the second bearing group 106 to prevent the second bearing group 106 from falling out of the first shaft seat 102.In this embodiment, the transmission shaft 203 is supported simultaneously by the first shaft seat 102 and the second shaft seat 204, which effectively avoids the occurrence of vibration, maintains the stability of the transmission shaft 203 during high-speed operation, and the entire structure is more compact; through the cooperation of the fixing hole 4 and the fixing bolt 5, the fixing bolt 5 passes through the nozzle 3 and the pump casing 201 at the same time and enters the fixing hole 4 located on the side wall of the mounting casing 1, and an internal thread corresponding to the end of the fixing bolt 5 is provided in the fixing hole 4 on the side wall of the mounting casing 1, so that the pump casing 201 can be locked and fixed between the nozzle 3 and the mounting casing 1. The overall structure adopts a split design and is relatively compact. When the pump body 2 needs to be disassembled for maintenance, it is only necessary to unscrew the fixing bolt 5. It is easy to disassemble and assemble, maintains good maintenance performance of the spray pump, and effectively reduces the installation space occupied.

[0027] In this specific example, a guide cone cap 208 is provided at one end of the second shaft seat 204 near the nozzle 3. The guide cone cap 208 is detachably mounted to the end of the second shaft seat 204. The guide cone cap 208 is used to streamline the water at the outlet of the pump body 2 into the nozzle 3, thereby reducing the resistance of the water flow and improving the efficiency of the spray pump. It is also used to block one end of the second shaft seat 204 to prevent water from entering the interior of the second shaft seat 204. The guide cone cap 208 can be removed during disassembly and maintenance to facilitate the removal of the first bearing assembly 206 and the drive shaft 203 in the second shaft seat 204.

[0028] In a specific example, a drainage hole 209 is radially opened on the side wall of the pump casing 201, and a connector 2010 is provided at the drainage hole 209, which is convenient for installing a sealing valve or plug; the drainage hole 209 passes through the area of ​​the guide plate 205, and is used to discharge the air in the pump casing 201 to ensure that the spray pump can be filled with water. At the same time, it is used for drainage when the pump is stopped for maintenance, and can also be used for drainage to prevent freezing when idle in winter. When working, the water is connected to the pipeline through the connector 2010 to introduce it into the part that requires circulating cooling.

[0029] In a specific example, the propeller assembly 202 includes a propeller blade 2011 and a propeller hub 2012. The propeller hub 2012 has a conical structure. The propeller blade 2011 is fixed around the outer circumference of the propeller hub 2012. The outer diameter of the cone bottom of the propeller hub 2012 is consistent with the outer diameter of the second shaft seat 204, and the outer diameter of the cone top of the propeller hub 2012 is consistent with the shoulder diameter of the drive shaft 203, so that the propeller hub 2012, the second shaft seat 204 and the guide cone 208 form a whole with small ends and a large middle, presenting a streamlined body, which is further beneficial to reducing the resistance of the water flow and improving the efficiency of the jet pump.

[0030] In a preferred embodiment, an axial hole 2013 is opened at the axis of the impeller hub 2012, a spline groove 2014 is provided on the inner wall of the axial hole 2013, a spline area 2015 corresponding to the spline groove 2014 is provided on the transmission shaft 203, and a locking nut 2016 for fixing the impeller hub 2012 to the spline area 2015 is provided on the transmission shaft 203. The axial hole 2013 is set as a stepped hole structure, and the spline groove 2014 is set in the smaller inner diameter section of the axial hole 2013. After the locking nut 2016 locks the blade hub 2012, it can be received in the larger inner diameter section of the axial hole 2013. When assembling the propeller assembly 202, the spline groove 2014 of the blade hub 2012 is inserted into the spline area 2015 of the transmission shaft 203, and then locked by the locking nut 2016 to prevent the blade hub 2012 from retreating. After the locking nut 2016 is locked, the whole is wrapped into the larger inner diameter section of the axial hole 2013, and will not affect the streamlined structure formed by the docking of the blade hub 2012 and the second shaft seat 204.

[0031] In a specific example, the mounting housing 1 is provided with an outer flange 103 at the inlet end of the water inlet channel 101, and a plurality of mounting holes 104 are opened on the outer flange 103. The arrangement of the outer flange 103 and the mounting holes 104 facilitates fixing the mounting housing 1 to the surfboard.

[0032] In this specific example, second bearing set 106 comprises two sets of angular contact ball bearings, arranged back-to-back, to support and withstand the axial and radial loads of drive shaft 203. The outer rings of the angular contact ball bearings are installed within the working chamber of second shaft seat 204 using an interference fit, while drive shaft 203 also passes through the inner rings of the angular contact ball bearings using an interference fit. This back-to-back arrangement of the angular contact ball bearings provides relatively high cantilever end rigidity and prevents drive shaft 203 from becoming stuck or damaged when heated and elongated, making it suitable for use in environments such as second shaft seat 204, where space is limited and heat dissipation is limited.

[0033] In this specific example, the nozzle 3 is a tapered tube structure with a clearance groove 301 formed on its outer circumference, corresponding to the fixing hole 4. The nozzle 3 is used to converge the water flow and constrain the spray direction, converting the water flow's pressure energy into kinetic energy and increasing the spray velocity. The clearance groove 301 accommodates the hexagon socket head of the fixing bolt 5, preventing it from protruding from the outer surface of the nozzle 3 and becoming more prominent.

[0034] In the specific example, the first sealing ring 207 and the second sealing ring 105 both use mechanical seals. Mechanical seals can form a more reliable sealing effect under the action of fluid pressure and the elastic force of the compensation mechanism, are suitable for high-speed spray pumps, and have a long service life.

[0035] The above content is a further detailed description of the present invention in conjunction with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, they can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be considered to belong to the scope of protection of the present invention. In the description of this specification, the reference terms "one embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples" or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in an appropriate manner in any one or more embodiments or examples. In the absence of mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of protection of the patent application.

Claims

1. An underwater jet pump for a power surfboard, characterized by: The pump is mounted on a top of the pump body, wherein the pump is mounted on a bottom of the pump body and the bottom of the pump body is mounted on a bottom of the pump body.

2. The underwater jet pump for a power surfboard according to claim 1, characterized in that: A guide cone is provided on one end of the second shaft seat close to the nozzle.

3. The underwater jet pump for a power surfboard according to claim 2, characterized in that: A drainage hole is radially opened on the side wall of the pump casing, and a connector is provided at the drainage hole.

4. The underwater jet pump for a power surfboard according to any one of claims 1 to 3, characterized in that: The propeller assembly includes propeller blades and a propeller hub. The propeller hub is a conical structure. The propeller blades are fixed around the outer circumference of the propeller hub. The outer diameter of the cone bottom of the propeller hub is consistent with the outer diameter of the second shaft seat.

5. The underwater jet pump for a power surfboard according to claim 4, characterized in that: The impeller hub is provided with an axial hole, the inner wall of the axial hole is provided with a spline groove, the transmission shaft is provided with a spline area corresponding to the spline groove, and the transmission shaft is provided with a locking nut for fixing the impeller hub to the spline area.

6. The underwater jet pump for a power surfboard according to claim 5, characterized in that: The axial hole is set as a stepped hole structure, the spline groove is set in the section with smaller inner diameter of the axial hole, and the locking nut can be received in the section with larger inner diameter of the axial hole after locking the impeller hub.

7. The underwater jet pump for a power surfboard according to claim 1, characterized in that: The installation shell is provided with an outer flange at the inlet end of the water inlet channel, and a plurality of installation holes are opened on the outer flange.

8. The underwater jet pump for a power surfboard according to claim 1, characterized in that :The second bearing group is two groups of angular contact ball bearings, which are arranged back to back to support and bear the axial load and radial load of the transmission shaft.

9. The underwater jet pump for a power surfboard according to claim 1, characterized in that: The nozzle is a tube structure with a gradually decreasing diameter, and a recess corresponding to the fixing hole is provided on the outer peripheral surface of the nozzle.

10. The underwater jet pump for a power surfboard according to claim 1, characterized in that: The first sealing ring and the second sealing ring both adopt mechanical sealing.

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