A rowing machine water tank structure that is easy to produce

Abstract

The utility model provides an easy production's rowing machine water tank structure, including water tank main part, water storage bucket and adjusting mechanism, forms the water storage cavity in water storage bucket inside, is equipped with arc water outlet hole in water storage cavity inner bottom portion, adjusting mechanism includes adjusting knob, control sleeve and stop piece, control sleeve rotation is equipped in water storage cavity inner bottom portion, adjusting knob is equipped in water tank main part outside, stop piece includes arc cover section and arc drive section, transmission connection between arc drive section and output, still include water inlet assembly, water inlet assembly is by at least 2 section combination unit head -tail continuous splicing constitutes, combination unit is detachable in water storage bucket, and encloses water inlet, the utility model of simplifying water storage bucket's structure need not complicated stripping procedure, can conveniently realize production, simultaneously, utilize detachable modularization combination unit, can conveniently produce and combination to combination unit, change the position of water inlet, be convenient for adaptation different use and installation demand, fully promote its adaptation range.

Description

Technical Field

[0001] This utility model relates to the technical field of rowing machine water tank structure, and in particular to a rowing machine water tank structure that is easy to manufacture. Background Technology

[0002] A rowing machine, also known as a rowing machine, rowing boat machine, rowing machine, ergometer, land rowing machine, or indoor rowing machine, is a training device that simulates the sport of rowing on water. Currently, rowing machines on the market mainly use three types of resistance: air resistance, magnetic resistance, and water resistance. Among them, water resistance rowing machines have become a mainstream choice because they offer the best motion simulation effect, allowing users to simultaneously receive visual, auditory, and tactile feedback similar to real rowing. During exercise, water resistance rowing machines utilize the dynamic changes in liquid resistance and wheel speed to provide targeted training for the muscles of the legs, waist, upper limbs, chest, and back. Each complete muscle contraction and extension movement provides a full-body aerobic exercise, resulting in significant training effects.

[0003] In the design of the water resistance tank, the core component of a water resistance rowing machine, its placement is mainly divided into three types based on usage scenarios and functional requirements: horizontal, inclined, and vertical. Although the water resistance varies depending on the placement method, in existing designs, a single water resistance tank typically corresponds to only one fixed placement method, resulting in insufficient flexibility in water resistance adjustment. Specifically, for inclined water resistance tanks, current adjustment methods mostly rely on adding or removing liquid from the tank to change the resistance. This adjustment method is cumbersome and makes it difficult to achieve quick and precise water resistance adjustment, severely impacting the user experience.

[0004] To address the aforementioned challenge of water resistance adjustment, those skilled in the art have proposed relevant improvements. For example, Chinese Patent Publication No. CN222829002U discloses an adjustment structure for an inclined water resistance tank and a rowing device. This solution involves setting an adjustment block inside the water resistance tank to change the opening size of the water outlet channel, thereby controlling the water level in the storage tank. When the rowing device's paddles rotate, water from the tank flows into the storage tank through the inlet channel. Once the water level reaches the height set by the adjustment block, excess water is discharged through the outlet channel, ultimately achieving water resistance adjustment.

[0005] However, the existing improvement solutions mentioned above still have significant drawbacks: Firstly, in order to achieve the functions of water inlet and outlet control and water resistance adjustment, a complex channel structure needs to be designed inside the water storage tank, which increases the overall structural complexity of the water resistance box. In the manufacturing process, especially in the mold demolding stage, an additional demolding step is required to complete the molding, which is not easy to manufacture and has a high cost.

[0006] Secondly, the water inlet and water storage tank in this design are integrally molded structures, and their positions and dimensions are fixed and cannot be flexibly adjusted according to actual usage needs, resulting in poor adaptability.

[0007] In view of this, the inventor has specifically designed a rowing machine water tank structure that is easy to manufacture, and this invention arises from this. Utility Model Content

[0008] To solve the above problems, the technical solution of this utility model is as follows: A rowing machine water tank structure that is easy to manufacture includes a water tank body, a water storage tank and an adjustment mechanism. A water storage cavity is formed inside the water storage tank, and an arc-shaped water outlet hole extending along its periphery is opened through the bottom of the water storage cavity and near its side wall. The adjustment mechanism includes an adjustment knob, a control sleeve, and a stop plate. The control sleeve is rotatably located at the bottom of the water storage cavity and has an output end. The adjustment knob is located on the outside of the water tank body and is coaxially connected to the control sleeve. The stop plate includes an arc-shaped covering section for covering the arc-shaped water outlet and an arc-shaped driving section extending along the edge of the arc-shaped covering section. The arc-shaped driving section and the output end are connected by a gear and rack structure. It also includes a water inlet assembly, which is composed of at least two segments of combined units with the same curvature as the upper edge of the water storage tank, continuously spliced ​​together end to end. The combined units are detachable and locked to the upper surface of the water storage tank, and the two ends of several combined units enclose each other to form a water inlet for liquid to enter.

[0009] Preferably, it also includes a guide limiting member, which is detachably connected to the bottom of the water storage cavity on one side of the arc-shaped water outlet, and forms an arc-shaped guide groove on the side facing the arc-shaped water outlet that is adapted to the curvature of the stop plate. Both sides of the arc-shaped guide groove along its extension direction are connected to the outside.

[0010] Preferably, the guide limiting member includes an arc-shaped connecting base plate and an "L"-shaped clamping plate integrally connected upward along the connecting base plate, the inner side of the clamping plate forming the arc-shaped guide groove.

[0011] Preferably, the bottom of the arc-shaped covering section is recessed inward to form a hollow groove, and the bottom edge of the arc-shaped covering section extends outward to form an arc-shaped guard edge with the same curvature as the arc-shaped covering section.

[0012] Preferably, the side wall of the arc-shaped drive section away from the arc-shaped cover section forms an arc-shaped rack structure distributed along its arc surface, and the bottom of the control sleeve along its axial direction is provided with an external gear structure that can mesh with the arc-shaped rack structure.

[0013] Preferably, the control sleeve has a limiting edge along its axial direction and located at the upper end of the external gear structure, the outer edge of the limiting edge extending beyond the external gear structure to limit the displacement of the stop plate along its axial direction.

[0014] Preferably, the top surface of the arc-shaped driving segment is flush with the top surface of the arc-shaped covering segment.

[0015] Preferably, the side wall of the arc-shaped covering section extends downward near the arc-shaped rack structure to form a stop plate that matches the arc-shaped water outlet.

[0016] Preferably, a stop wall is vertically protruding from the bottom surface of the water storage cavity and on the side of the arc-shaped water outlet near the control sleeve.

[0017] Preferably, the upper opening edge of the water storage tank extends outward to form a ring-shaped connecting edge, and a plurality of first locking holes with the same spacing are opened through the ring-shaped connecting edge. The assembly unit is provided with a plurality of first locking sleeves with the same spacing as the first locking holes. The inner top of the water tank body extends downward to form a plurality of second locking sleeves with the same spacing as the first locking holes and opposite positions. The first locking sleeves extend vertically to form a first threaded locking channel that mates with the first locking holes. The second locking sleeves are provided with a second threaded locking channel that mates with the first threaded locking channel.

[0018] The beneficial effects of this utility model are as follows: This invention replaces the existing complex cavity structure with a combination of an arc-shaped water outlet and a detachable adjustment mechanism. Only an arc-shaped water outlet needs to be opened at the bottom of the water tank, eliminating the need for additional processing of a sealed channel. This reduces the mold cavity and demolding process, lowering manufacturing costs and production failure rates. Furthermore, the adjustment mechanism and water inlet assembly adopt a modular design, allowing them to be molded separately and then assembled, significantly improving production efficiency. The water inlet assembly is composed of at least two arc-shaped combination units. By adjusting the number and installation position of the combination units, the diameter and circumferential position of the water inlet can be flexibly changed to adapt to different specifications of rowing machine main units and user needs. There is no need to design a separate water tank, reducing development and inventory costs.

[0019] In addition, the regulating mechanism adopts a gear and rack transmission combined with multiple structure limiters to ensure that the stop plate moves stably along the arc-shaped water outlet, thereby achieving precise control of the water flow rate and improving the stability of water resistance regulation and user experience.

[0020] In addition, all core components are designed to be detachable. Guide limiters, water inlet assembly units, etc. are easy to disassemble for cleaning or to replace individually, without having to disassemble the entire water storage tank, reducing after-sales maintenance time and costs and extending product life.

[0021] Meanwhile, the arc-shaped guard edge of the stop plate works in conjunction with the hollowed-out groove and the annular connecting edge of the water storage tank to balance sealing performance, adjustment sensitivity and installation firmness, achieving a balance between structural strength and practical function.

[0022] In summary, this utility model simplifies the structure of the water storage tank, eliminates the need for a complex demolding process, and facilitates production. At the same time, by utilizing detachable modular assembly units, the assembly units can be easily produced and combined, and the position of the water inlet can be changed to adapt to different usage and installation needs, thus greatly improving its adaptability. Attached Figure Description

[0023] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0024] in: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is an exploded structural diagram of the present invention; Figure 3 This is a cross-sectional view and an exploded structural diagram of this utility model; Figure 4 This is a schematic diagram of a partial explosion of the water storage tank in this utility model; Figure 5 This is a schematic diagram highlighting the three-dimensional structure of the water storage tank in this utility model; Figure 6 This is one of the partial exploded structural diagrams highlighting the adjustment mechanism in this utility model; Figure 7 This is the second partially exploded structural diagram highlighting the adjustment mechanism in this utility model; Figure 8 This is a three-dimensional structural diagram of the stop plate in this utility model; Figure 9 This is a schematic diagram of the assembly state of the various components inside the water storage tank in this utility model.

[0025] Label Explanation: 100. Water tank body; 110. Upper tank body; 111. Second locking screw sleeve; 112. Second threaded locking channel; 120. Lower tank body; 130. Blade assembly; 140. Internal space; 150. Seal; 200. Water storage tank; 210. Water storage cavity; 220. Arc-shaped water outlet; 230. Rotating bushing; 240. Stop wall; 250. Annular connecting edge; 251. First locking hole; 260. Auxiliary locking channel; 300. Adjustment mechanism; 400. Adjustment knob; 500. Control sleeve; 510. External gear structure; 520. Limiting edge; 600 610. Stop plate; 611. Arc-shaped cover section; 612. Hollowed-out groove; 620. Stop plate; 630. Arc-shaped drive section; 640. Arc-shaped guard edge; 700. Arc-shaped rack structure; 711. Guide limit component; 720. Connecting base plate; 730. Pressing plate; 740. Arc-shaped guide groove; 750. Reinforcing rib; 750. Locking screw hole; 800. Water inlet assembly; 810. Assembly unit; 811. First locking screw sleeve; 812. First threaded locking channel; 820. Water inlet; 830. Insertion end; 840. Insertion groove; 850. Butt sleeve; 851. Fitting groove. Detailed Implementation

[0026] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0027] Please see Figures 1 to 9 This is a rowing machine water tank structure that is easy to manufacture, which is the preferred embodiment of the present utility model. It includes a water tank body 100, a water storage tank 200 and an adjustment mechanism 300. A water storage cavity 210 is formed inside the water storage tank 200. An arc-shaped water outlet hole 220 is provided through the bottom of the water storage cavity 210 and near its side wall, extending along its peripheral edge.

[0028] Specifically, the water tank body 100 includes an upper tank 110, a lower tank 120, a blade assembly 130, and a sealing element 150 disposed between the upper tank 110 and the lower tank 120. The upper tank 110 and the lower tank 120 enclose an internal space 140. The water storage tank 200 is cylindrical in shape with its opening facing upwards and can be detachably locked to the inner bottom of the upper tank 110 to keep it at the top of the internal space 140. There is a gap between the bottom of the water storage tank 200 and the bottom of the internal space 140 to allow the blade assembly 130 to be inserted. A corresponding drive shaft (not shown in the figure) passes through the center of the water storage tank 200 and the upper tank 110 to transmit the water resistance generated when the blade assembly 130 agitates the liquid. This is the conventional structure of the water tank body 100 in the prior art and will not be described in detail here.

[0029] The adjustment mechanism 300 includes an adjustment knob 400, a control sleeve 500, and a stop plate 600. The control sleeve 500 is rotatably located at the bottom of the water storage cavity 210 and has an output end (not shown in the figure). The adjustment knob 400 is located on the outside of the water tank body 100 and is coaxially connected to the control sleeve 500. The stop plate 600 includes an arc-shaped covering section 610 for covering the arc-shaped water outlet 220 and an arc-shaped driving section 620 extending along the edge of the arc-shaped covering section 610. The arc-shaped driving section 620 is connected to the output end through a gear and rack structure.

[0030] Specifically, the adjustment knob 400 is rotatably mounted on the top of the upper housing 110, and its lower end extends into the built-in space 140 and penetrates into the water storage cavity 210. The control sleeve 500 is cylindrical in shape, and its top is connected to the bottom of the adjustment knob 400 via a transmission connection (such as through a keyway and a key), thereby driving the control sleeve 500 to rotate coaxially through the adjustment knob.

[0031] In addition, a rotating bushing 230 is protruding from the bottom of the water storage cavity 210, and the bottom of the control sleeve 500 is provided with a rotating hole (not shown in the figure) that rotatably engages with the rotating bushing 230. Thus, the control sleeve 500 can be rotated through the rotating bushing 230 to drive the stop plate 600, causing it to move around the arc-shaped edge of the water storage cavity 210 to close or open the arc-shaped water outlet 220, thereby achieving accurate control of the water flow rate.

[0032] Specifically, it also includes a guide limiting member 700, which is detachably connected to the bottom of the water storage cavity 210 on one side of the arc-shaped water outlet 220, and forms an arc-shaped guide groove 730 on the side facing the arc-shaped water outlet 220 that is adapted to the curvature of the stop plate 600. Both sides of the arc-shaped guide groove 730 along its extension direction are connected to the outside.

[0033] In this embodiment, the guide limiting member 700 includes a flat connecting base plate 710 extending in an arc shape and a pressing plate 720 integrally connected upward along the connecting base plate 710 and having an L-shaped cross-section. The inner side of the pressing plate 720 forms an arc-shaped guide groove 730 that adapts to the curvature of the stop piece 600. Both sides of the arc-shaped guide groove 730 are hollowed out and directly communicate with the outside, so that the stop piece 600 can slide stably along the arc-shaped path under the dual limiting of the arc-shaped guide groove 730 and the water storage cavity 210.

[0034] In addition, the connecting base plate 710 is provided with two reinforcing ribs 740 that are directly and integrally fixed between the connecting base plate 710 and the clamping plate 720. The two reinforcing ribs 740 divide the connecting base plate 710 into three areas. Each area is provided with a locking screw hole 750. The bottom of the water storage cavity 210 is provided with a corresponding mating hole (not shown in the figure) on one side of the arc-shaped water outlet 220, so as to lock and fix the connecting base plate 710.

[0035] Specifically, the bottom of the arc-shaped covering section 610 is recessed inward to form a hollow groove 611, and the bottom edge of the arc-shaped covering section 610 extends outward to form an arc-shaped guard 630 with the same curvature as the arc-shaped covering section 610.

[0036] Preferably, the side wall of the arc-shaped drive section 620 away from the arc-shaped cover section 610 forms an arc-shaped rack structure 640 distributed along its arc surface, and the bottom of the control sleeve 500 along its axial direction is provided with a disc-shaped external gear structure 510 that can mesh with the arc-shaped rack structure 640.

[0037] In addition, the top surface of the arc-shaped drive section 620 is flush with the top surface of the arc-shaped cover section 610.

[0038] Thus, under the dual limiting of the arc-shaped guide groove 730 and the water storage cavity 210, the arc-shaped rack structure 640 on the arc-shaped drive section 620 and the external gear structure 510 at the bottom of the control sleeve 500 remain engaged. When the adjustment is turned, the control sleeve 500 rotates around the rotating shaft sleeve 230. At this time, due to the meshing relationship between the arc-shaped rack structure 640 and the external gear structure 510, the entire stop plate 600 will move along the arc-shaped path corresponding to its own curvature. During the movement, it will cover or open the arc-shaped water outlet 220, changing the size of the orifice used for water outlet, so as to achieve the final water output control.

[0039] Furthermore, the control sleeve 500 has an annular limiting edge 520 along its axial direction and located at the upper end of the external gear structure 510. The outer edge of the limiting edge 520 extends beyond the external gear structure 510 to limit the displacement of the stop plate 600 along its axial direction.

[0040] Therefore, when the external gear structure 510 at the bottom of the control sleeve 500 meshes with the arc-shaped rack structure 640 on the arc-shaped drive section 620, the lower end face of the limiting edge 520 contacts the upper end face of the arc-shaped drive section 620. Since the top surface of the arc-shaped drive section 620 is flush with the top surface of the arc-shaped cover section 610, the limiting edge 520 will work with the pressing plate 720 to restrict the stop plate 600 during the entire movement of the stop plate 600, preventing the stop plate 600 from dislodging in the vertical direction, and ultimately keeping it in a stable and controllable movement state.

[0041] Preferably, the side wall of the arc-shaped covering section 610 near the arc-shaped rack structure 640 extends downward to form a stop plate 612 that is matched with the arc-shaped water outlet 220.

[0042] In this embodiment, the stop plate 612 extends integrally along the side wall of the hollowed-out groove 611 on the arc-shaped cover section 610, and its two side walls symmetrically form inclined guide surfaces (not shown in the figure) to facilitate clearance and guidance. When the stop plate 600 moves along the arc-shaped path of the arc-shaped water outlet 220, the stop plate 612 moves within the arc-shaped water outlet 220. When it contacts the two end side walls of the arc-shaped water outlet 220, the stop plate 600 is blocked. This is the adjustment range to avoid excessive rotation that could cause the stop plate 600 to dislodge.

[0043] Preferably, a stop wall 240 is vertically protruding on the bottom surface of the water storage cavity 210 and on the side of the arc-shaped water outlet 220 close to the control sleeve 500.

[0044] The stop wall 240 is a vertical plate and is set perpendicular to the bottom surface of the water storage cavity 210. This allows it to be easily molded without additional demolding clearance. In addition, it can work with the stop plate 612 to further limit the movement of the stop piece 600 and prevent the stop piece 600 from dislodging.

[0045] Specifically, it also includes a water inlet assembly 800, which is composed of at least two assembly units 810 with the same curvature as the upper edge of the water storage tank 200, which are continuously spliced ​​end to end. The assembly units 810 can be detachably locked to the upper surface of the water storage tank 200, and the two ends of several assembly units 810 enclose each other to form a water inlet 820 for liquid to enter.

[0046] In this embodiment, the water inlet assembly 800 is composed of three segments of assembly units 810 with the same curvature as the upper edge of the water storage tank 200, which are continuously spliced ​​together end to end. Each segment of assembly unit 810 has a V-shaped insertion end 830 and a V-shaped insertion groove 840 at both ends, which makes the water inlet assembly 800 more stable as a whole.

[0047] Specifically, to achieve the connection, the upper opening edge of the water storage tank 200 extends outward to form a ring-shaped connecting edge 250. Several first locking holes 251 with the same spacing are opened through the ring-shaped connecting edge 250. The assembly unit 810 is provided with several first locking sleeves 811 with the same spacing as the first locking holes 251. The bottom of the upper box 110 extends downward to form several second locking sleeves 111 with the same spacing as the first locking holes 251 and opposite positions. The first locking sleeves 811 extend vertically to form a first threaded locking channel 812 that cooperates with the first locking holes 251. The second locking sleeves 111 are provided with a second threaded locking channel 112 that cooperates with the first threaded locking channel 812.

[0048] In this embodiment, in order to cooperate with the first locking hole 251, several auxiliary locking channels 260 are formed by indentation on the outer side wall of the water storage tank 200. The auxiliary locking channels 260 are generally in the shape of a gradually expanding semi-circular groove with a smaller top and a larger bottom. The first locking hole 251 passes through the annular connecting edge 250 and directly connects to the auxiliary locking channels 260, thereby facilitating the locking and fixing of the corresponding locking bolts from below the first locking hole 251.

[0049] In order to cooperate with the second locking screw sleeve 111, a mating sleeve 850 is integrally provided on the upper end of the first locking screw sleeve 811. The mating sleeve 850 has a fitting groove 851 inside that fits into the second locking screw sleeve 111, and the fitting groove 851 keeps the first threaded locking channel 812 and the second threaded locking channel 112 in communication.

[0050] Therefore, the process of fixing the water storage tank 200 and forming the water inlet 820 is as follows: First, the three combination units 810 are pre-placed on the upper end of the water storage tank 200. After designing the position of the water inlet 820, the three combination units 810 are pre-fixed by partially screwing in the locking bolts. Then, the entire water storage tank 200 is placed upwards at the bottom of the upper box 110, so that the first locking sleeve 811 on the combination unit 810 is aligned with the corresponding second locking sleeve 111. After insertion, the second locking sleeve 111 is embedded in the mating sleeve 850. Finally, the locking bolts are tightened further so that the locking bolts are further inserted into the second threaded locking channel 112 for locking. This achieves the locking and fixing of the water storage tank 200, the combination units 810 and the upper box 110, and the setting of the water inlet 820 can be completed in this process.

[0051] The beneficial effects of this utility model are as follows: This utility model replaces the existing complex cavity structure with a combination of an arc-shaped water outlet 220 and a detachable adjustment mechanism 300. Only an arc-shaped water outlet 220 needs to be opened at the bottom of the water storage tank 200, eliminating the need for additional processing of sealed channels, reducing mold cavities and demolding processes, lowering manufacturing costs and production failure rates. Furthermore, both the adjustment mechanism 300 and the water inlet assembly 800 adopt a modular design, which can be molded separately and then assembled, significantly improving production efficiency. The water inlet assembly 800 is composed of at least two arc-shaped combination units 810 spliced ​​together. By adjusting the number and installation position of the combination units 810, the diameter and circumferential position of the water inlet 820 can be flexibly changed to adapt to different specifications of rowing machine main units and user needs. There is no need to design a separate water storage tank 200, reducing development and inventory costs.

[0052] In addition, the regulating mechanism 300 adopts a gear and rack transmission combined with multiple structure limiters to ensure that the stop plate 600 moves stably along the arc-shaped water outlet 220, thereby achieving precise control of the water flow rate and improving the stability of water resistance regulation and user experience.

[0053] In addition, all core components are designed to be detachable. The guide limiter 700 and the water inlet assembly unit 810 are easy to disassemble for cleaning or to be replaced individually, without having to disassemble the water storage tank 200 as a whole, reducing after-sales maintenance time and costs and extending product life.

[0054] Meanwhile, the arc-shaped guard edge 630 of the stop plate 600, the hollow groove 611, the annular connecting edge 250 of the water storage tank 200, and other structures work together to balance sealing performance, adjustment sensitivity, and installation firmness, achieving a balance between structural strength and practical function.

[0055] In summary, this utility model simplifies the structure of the water storage tank 200, eliminates the need for a complex demolding process, and facilitates production. At the same time, by utilizing the detachable modular combination unit 810, the combination unit 810 can be easily produced and combined, and the position of the water inlet 820 can be changed to adapt to different usage and installation requirements, thus greatly improving its adaptability.

[0056] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A rowing machine water tank structure that is easy to manufacture, comprising a water tank body (100), a water storage tank (200), and an adjustment mechanism (300), characterized in that, The water storage tank (200) forms a water storage cavity (210) on its inner side, and an arc-shaped water outlet hole (220) extending along its periphery is provided through the bottom of the water storage cavity (210) and near its side wall. The adjustment mechanism (300) includes an adjustment knob (400), a control sleeve (500), and a stop plate (600). The control sleeve (500) is rotatably disposed at the bottom of the water storage cavity (210) and has an output end. The adjustment knob (400) is disposed on the outside of the water tank body (100) and is coaxially connected to the control sleeve (500). The stop plate (600) includes an arc-shaped covering section (610) for covering the arc-shaped water outlet (220) and an arc-shaped driving section (620) extending along the edge of the arc-shaped covering section (610). The arc-shaped driving section (620) is connected to the output end through a gear and rack structure. It also includes a water inlet assembly (800), which is composed of at least two assembly units (810) with the same curvature as the upper edge of the water storage tank (200) connected end to end. The assembly units (810) can be detachably locked to the upper surface of the water storage tank (200), and the two ends of several assembly units (810) enclose each other to form a water inlet (820) for liquid to enter.

2. The rowing machine water tank structure according to claim 1, characterized in that, It also includes a guide limiting member (700), which is detachably connected to the bottom of the water storage cavity (210) on one side of the arc-shaped water outlet (220), and forms an arc-shaped guide groove (730) on the side facing the arc-shaped water outlet (220) that is adapted to the curvature of the stop plate (600). Both sides of the arc-shaped guide groove (730) along its extension direction are connected to the outside.

3. The rowing machine water tank structure according to claim 2, characterized in that, The guide limiting member (700) includes an arc-shaped connecting base plate (710) and an "L"-shaped clamping plate (720) integrally connected upward along the connecting base plate (710). The inner side of the clamping plate (720) encloses to form the arc-shaped guide groove (730).

4. The rowing machine water tank structure according to claim 1, characterized in that, The bottom of the arc-shaped covering section (610) is recessed inward to form a hollow groove (611), and the bottom edge of the arc-shaped covering section (610) extends outward to form an arc-shaped guard edge (630) with the same curvature as the arc-shaped covering section (610).

5. The rowing machine water tank structure according to claim 4, characterized in that, The arc-shaped drive section (620) forms an arc-shaped rack structure (640) along its arc surface on the side wall away from the arc-shaped cover section (610), and the control sleeve (500) is provided with an external gear structure (510) at its bottom along its axial direction that can mesh with the arc-shaped rack structure (640).

6. The rowing machine water tank structure according to claim 5, characterized in that, The control sleeve (500) has a limiting edge (520) along its axial direction and located at the upper end of the external gear structure (510), the outer edge of which extends beyond the external gear structure (510) to limit the displacement of the stop plate (600) along its axial direction.

7. The rowing machine water tank structure according to claim 5, characterized in that, The top surface of the arc-shaped drive section (620) is flush with the top surface of the arc-shaped cover section (610).

8. The rowing machine water tank structure according to claim 4, characterized in that, The arc-shaped covering section (610) extends downward from one side wall of the arc-shaped rack structure (640) to form a stop plate (612) that is matched with the arc-shaped water outlet (220).

9. The rowing machine water tank structure according to claim 4, characterized in that, A stop wall (240) is vertically protruding on the bottom surface of the water storage cavity (210) and on the side of the arc-shaped water outlet (220) close to the control sleeve (500).

10. The rowing machine water tank structure according to claim 1, characterized in that, The upper opening edge of the water storage tank (200) extends outward to form a ring connecting edge (250). Several first locking holes (251) with the same spacing are opened through the ring connecting edge (250). Several first locking sleeves (811) with the same spacing as the first locking holes (251) are provided on the combined unit (810). The inner top of the water tank body (100) extends downward to form several second locking sleeves (111) with the same spacing as the first locking holes (251) and opposite positions. The first locking sleeves (811) are formed by penetrating vertically to form a first threaded locking channel (812) that cooperates with the first locking hole (251). The second locking sleeves (111) are provided with a second threaded locking channel (112) that cooperates with the first threaded locking channel (812).

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