A soft reservoir and liquid ram compression speed limiting system

Abstract

The utility model relates to automatic speed -limiting technical field discloses a soft liquid storage device and liquid back -up compression type speed -limiting system, and soft liquid storage device includes the flexible inner tube and spring -like metal outer tube of soft material, and liquid back -up compression type speed -limiting system includes liquid pump, and the rotating shaft of liquid pump is fixed to walking mechanism rotating axle, and liquid cylinder throttler and soft liquid storage device are connected in proper order from the liquid outlet of liquid pump to liquid inlet, and liquid cylinder throttler includes liquid cylinder, throttle valve and piston reset spring, and the cylinder stem of liquid cylinder is connected with the valve element of throttle valve through transmission mechanism and drives, and the liquid outlet of liquid pump is connected to liquid cylinder and throttle valve through two branches respectively, and piston reset spring provides the reset force opposite to hydraulic propelling force for the piston of liquid cylinder.

Description

Technical Field

[0001] This utility model relates to the field of automatic speed limiting technology, and in particular to a soft liquid reservoir and a liquid inverted compression speed limiting system. Background Technology

[0002] Push wheelchairs, shopping carts, walking aids for the elderly, and children's scooters are all very common non-motorized walking devices. To improve the safety of using these non-motorized walking devices, some are also equipped with walking speed limiters.

[0003] As previously disclosed in Chinese invention patent application CN116639174A, this inventor presents an automatic braking method and mechanism for a non-powered walking device. A hydraulic pump is connected to and linked to the wheels of the non-powered walking device, serving as the hydraulic braking power source. During the movement of the non-powered walking device, the rotating wheels drive the hydraulic pump, which in turn circulates the braking fluid. A flow control valve is installed along the circulation path of the braking fluid, and the opening of the flow control valve controls the braking speed point of the non-powered walking device. When the walking speed of the non-powered walking device reaches the braking speed point, automatic hydraulic braking is initiated.

[0004] Although the automatic braking method provided by the above invention can achieve automatic braking and change the braking speed point, it relies on a special hydraulic braking mechanism; and the medium liquid storage tank is a rigid tank, which has problems such as air mixing and being easily restricted by the installation area. Summary of the Invention

[0005] The purpose of this utility model is to provide a flexible liquid reservoir that can be bent and shaped for installation, and a liquid inverted compression speed limiting system having the flexible liquid reservoir, so as to provide at least one beneficial option or create conditions for solving one or more technical problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] A soft liquid reservoir includes a flexible inner tube made of a soft material and a spring-shaped metal outer tube. The flexible inner tube is inserted inside the spring-shaped metal outer tube and is wrapped by the spring-shaped metal outer tube. The spring-shaped metal outer tube is a tension spring structure used to protect the flexible inner tube and dissipate heat from the flexible inner tube.

[0008] More preferably, the flexible inner tube is a rubber tube or a silicone tube, and the two ends of the flexible inner tube form liquid storage interface ends, which are used to connect to a rigid liquid delivery pipeline.

[0009] More preferably, both ends of the flexible inner tube extend out of the spring-shaped metal outer tube.

[0010] More preferably, the outer diameter of the flexible inner tube is the same as the inner diameter of the spring-shaped metal outer tube, and the flexible inner tube is inserted into the spring-shaped metal outer tube.

[0011] More preferably, the flexible inner tube is a vacuum tube, which is filled with liquid and free of air in any shape.

[0012] On the other hand, this utility model also provides a liquid-driven compression speed limiting system, which includes a liquid pump. The rotating shaft of the liquid pump is connected to the rotating shaft of the traveling mechanism and rotates under the drive of the rotating shaft of the traveling mechanism. A liquid cylinder throttle and a soft liquid reservoir as described above are connected in sequence from the liquid outlet to the liquid inlet of the liquid pump. The liquid cylinder throttle includes a liquid cylinder, a throttle valve, and a piston return spring. The cylinder rod of the liquid cylinder is driven to the valve core of the throttle valve through a transmission mechanism. The liquid outlet of the liquid pump is connected to the liquid cylinder and the throttle valve through two branches respectively. The piston return spring provides a return force to the piston of the liquid cylinder in the opposite direction to the hydraulic thrust.

[0013] When the walking speed of the walking mechanism increases, the rotation speed of the rotating shaft increases, which in turn causes more liquid to flow out from the liquid outlet of the liquid pump. At this time, the hydraulic thrust on the piston also increases, which in turn overcomes the reset force and moves the valve core to adjust the valve opening of the throttle valve, thereby reducing the system speed limit and playing a braking role.

[0014] When the walking speed of the walking mechanism slows down, the rotation speed of the rotating shaft also slows down, resulting in less liquid flowing out of the liquid outlet of the liquid pump. At this time, the hydraulic thrust on the piston also decreases, and under the action of the reset force, the valve core is pushed to adjust the valve opening of the throttle valve, the system speed limit increases, and the braking effect is released.

[0015] The speed limit value of the above-mentioned liquid inverted compression speed limiting system is determined by the position of the piston, that is, the opening degree of the throttle valve.

[0016] More preferably, a speed limiting adjustment device is connected to the piston. The speed limiting adjustment device includes a speed limiting adjustment handle and a screw. The screw is threadedly connected to the piston and extends out of the liquid cylinder to form a sliding connection with the liquid cylinder. The speed limiting adjustment handle is installed on the protruding end of the screw. The piston return spring is connected between the speed limiting adjustment handle and the outer wall of the liquid cylinder.

[0017] During operation, the initial position of the piston in the liquid cylinder and the initial tension of the piston return spring are adjusted by rotating the speed limiting adjustment handle, thereby achieving the purpose of adjusting the initial opening of the throttle valve and the speed limiting value.

[0018] More preferably, the valve core is a conical valve core that rotates in and out, and a conical valve port corresponding to the conical valve core is provided in the valve cavity of the throttle valve.

[0019] More preferably, the transmission mechanism is a gear and rack mechanism, with a gear connected to the valve core and a rack connected to the piston rod that meshes with the gear; when the piston moves back and forth, the piston rod drives the rack to move back and forth, thereby driving the gear to rotate, so as to realize the rotation of the valve core.

[0020] More preferably, a check valve is connected between the liquid outlet and the liquid inlet of the liquid pump. The check valve is unidirectionally open from the liquid inlet to the liquid outlet to relieve pressure when the liquid pump reverses.

[0021] More preferably, an anti-blockage throttle is connected between the liquid outlet and the liquid inlet of the liquid pump to release pressure when the liquid cylinder throttle is blocked.

[0022] More preferably, the walking mechanism is a non-powered walking device.

[0023] More preferably, the walking mechanism is a wheelchair, stroller, rehabilitation walker, or elderly assistive vehicle.

[0024] The technical solution provided by this utility model has at least the following technical effects or advantages.

[0025] I. This utility model provides a liquid-reverse compression speed limiting system, which uses a liquid cylinder throttle to automatically adjust the system's speed limit. When the walking mechanism's speed is too high, the liquid-reverse compression liquid cylinder reduces the throttle valve opening, thereby reducing the speed limit and applying a stall force to the liquid pump. By reducing the liquid pump's speed, the walking mechanism's speed is reduced. The speed limiting process does not rely on an additional hydraulic braking mechanism, stalls quickly, and braking is more sensitive. It features smooth speed reduction, fewer components, fewer malfunctions, safety and reliability, and no energy consumption.

[0026] II. The present invention provides a liquid inverted compression speed limiting system, which uses a soft liquid reservoir to store liquid. The soft liquid reservoir adopts a tubular double-layer material design, with an outer layer of tubular spring-shaped metal material (for protection and heat dissipation) and an inner layer of soft material to hold the liquid. It has the characteristics of small size, good heat dissipation, arbitrary bending, and convenient space installation. At the same time, the liquid is in a sealed vacuum body, and the working performance of the walking mechanism is not affected by the liquid reservoir working in vertical, horizontal, side-lying, or inverted states.

[0027] Other beneficial effects of this invention will become more apparent in the following description or may be learned through practice. Attached Figure Description

[0028] Figure 1 The diagram shown is a structural schematic of the liquid inverted compression speed limiting system provided by this utility model.

[0029] Figure 2 The diagram shown is a schematic of the structure of a liquid cylinder throttle.

[0030] Figure 3 The diagram shown is a structural schematic of the liquid cylinder throttle from another perspective.

[0031] Figure 4 The diagram shown is a structural schematic of a soft liquid reservoir.

[0032] Explanation of the reference numerals in the attached figures.

[0033] 1: Liquid pump, 2: Liquid cylinder throttle, 3: Soft liquid reservoir, 4: Check valve, 5: Anti-clogging throttle.

[0034] 1-1: Liquid outlet, 1-2: Liquid inlet.

[0035] 2-1: Liquid cylinder, 2-2: Throttle valve, 2-3: Piston return spring, 2-4: Cylinder rod, 2-5: Valve core, 2-6: Piston, 2-7: Speed ​​limit adjustment handle, 2-8: Screw, 2-9: Gear, 2-10: Rack.

[0036] 3-1: Flexible inner tube; 3-2: Spring-shaped metal outer tube. Detailed Implementation

[0037] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings, making the technical solution and beneficial effects of this utility model clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0038] Additional aspects and advantages of this invention will become apparent in the description that follows, or may be learned by practice of this invention.

[0039] Reference Figures 1-3 As shown, a liquid-driven compression speed limiting system includes a liquid pump 1, which is fixedly or otherwise connected to the rotating shaft of a traveling mechanism and rotates under the drive of the rotating shaft. A liquid cylinder throttle 2 and a soft reservoir 3 are sequentially connected from the liquid outlet to the liquid inlet of the liquid pump 1. The liquid cylinder throttle 2 includes a liquid cylinder 2-1, a throttle valve 2-2, and a piston return spring 2-3. The cylinder rod 2-4 of the liquid cylinder 2-1 is connected to the valve core 2-5 of the throttle valve 2-2 via a transmission mechanism. The liquid outlet of the liquid pump 1 is connected to the liquid cylinder 2-1 and the throttle valve 2-2 via two branches. The piston return spring 2-3 provides a return force to the piston 2-6 of the liquid cylinder 2-1 in the opposite direction to the hydraulic thrust.

[0040] The system's speed limit is determined by the piston's position, i.e., the opening degree of the throttle valve. The specific speed-limiting principle is as follows: When the traveling speed of the traveling mechanism increases, the rotational speed of the rotating shaft increases, resulting in more liquid flowing from the liquid outlet 1-1 of the liquid pump 1. At this time, the hydraulic thrust on the piston 2-6 also increases, thus overcoming the reset force and moving the valve core 2-5 to reduce the liquid output of the throttle valve 2-2, thereby decreasing the speed limit and acting as a brake. When the traveling speed of the traveling mechanism decreases, the rotational speed of the rotating shaft decreases, resulting in less liquid flowing from the liquid outlet 1-1 of the liquid pump 1. At this time, the hydraulic thrust on the piston 2-6 also decreases, and under the action of the reset force, it pushes the valve core 2-5 to increase the liquid output of the throttle valve, increasing the speed limit and releasing the brake.

[0041] Combined Figure 2 , Figure 3 As shown, a speed limiting adjustment device is connected to the piston 2-6. The speed limiting adjustment device includes a speed limiting adjustment handle 2-7 and a screw 2-8. The screw 2-8 is threadedly connected to the piston 2-6 and extends out to the outside of the liquid cylinder 2-1, where it is movably connected. The speed limiting adjustment handle 2-7 is mounted on the protruding end of the screw 2-8. A piston return spring 2-3 is connected between the speed limiting adjustment handle 2-7 and the outer wall of the liquid cylinder 2-1; preferably, the piston return spring 2-3 is sleeved on the screw 2-7. During operation, rotating the speed limiting adjustment handle 2-7 adjusts the initial position of the piston 2-6 within the liquid cylinder 2-1 and the initial tension of the piston return spring 2-3, thereby achieving the purpose of adjusting the initial speed limit.

[0042] It should be noted that in some embodiments, the speed limiting adjustment device can be omitted. When the speed limiting adjustment device is not present, the piston return spring 2-3 can be disposed in the liquid cylinder 2-1, as long as it can perform other reset functions.

[0043] Combined Figure 2 As shown, the valve core 2-5 is a conical valve core, and a conical valve port corresponding to the conical valve core is provided in the valve cavity of the throttle valve 2-2; a threaded rod is connected to the conical valve core, and the threaded rod is threadedly connected to the throttle valve 2-2 to realize the rotation of the valve core 2-5, thereby achieving the purpose of adjusting the valve port opening and controlling the flow rate.

[0044] Here, the advantage of configuring the valve core 2-5 as a screw-in / screw-out structure is that it facilitates the adjustment of the valve opening degree and its stability after adjustment in conjunction with the transmission mechanism. In some embodiments, the valve core 2-5 may also be configured as a reciprocating linear movement mechanism of other existing known or future possible structural forms; it is not limited to this embodiment.

[0045] In this embodiment, the transmission mechanism is a gear and rack mechanism. A gear 2-9 is connected to the valve core 2-5, and a rack 2-10 that meshes with the gear 2-9 is connected to the piston rod 2-4. When the piston 2-6 moves back and forth, the piston rod 2-4 drives the rack 2-10 to move back and forth, thereby driving the gear 2-9 to rotate, realizing the rotation of the valve core 2-5, adjusting the valve opening and controlling the liquid flow.

[0046] Combination Figure 4 As shown, the soft liquid reservoir 3 includes a flexible inner tube 3-1 made of soft material and a spring-shaped metal outer tube 3-2. The flexible inner tube 3-1 is inserted into the spring-shaped metal outer tube 3-2 and is wrapped by the spring-shaped metal outer tube 3-2. The spring-shaped metal outer tube 3-2 is used to protect the flexible inner tube 3-1, prevent the flexible inner tube 3-1 from flattening and bending at too small an angle, and also promote the heat dissipation of the flexible inner tube 3-1.

[0047] In this embodiment, the flexible inner tube 3-1 is preferably a vacuum tube, and the liquid fills the entire flexible inner tube in any shape. The flexible inner tube can be made of rubber or silicone. Both ends of the flexible inner tube 3-1 form liquid storage interface ends for connecting to liquid delivery pipes. Preferably, the spring-shaped metal outer tube 3-2 is a tension spring structure, tightly fitted without obvious gaps. Both ends of the spring-shaped metal outer tube 3-2 are fixed to the traveling mechanism through corresponding fixing holes. Preferably, the outer diameter of the flexible inner tube 3-1 is the same as the inner diameter of the spring-shaped metal outer tube 3-2, and the flexible inner tube 3-1 fits snugly inside the spring-shaped metal outer tube 3-2.

[0048] Thus, the flexible inner tube 3-1 is soft, oil-resistant, temperature-resistant, and expands and contracts freely. Combined with the double-layer design of the spring-shaped metal outer tube 3-2, it has the characteristics of small space occupation, light weight, good heat dissipation, and arbitrary bending, which is conducive to space installation. The liquid is in a sealed vacuum body, so there is no shortage of liquid or air mixing in the liquid system, which will affect the working performance of the walking mechanism. The liquid reservoir can work in any state (e.g., vertical, horizontal, side-lying, inverted) without affecting the working performance of the walking mechanism. It is particularly suitable for use on walking mechanisms that operate dynamically, for example, in elderly walking aids. When the walking aid is tilted during storage, the speed limiting performance will not be affected.

[0049] Combined Figure 1 As shown, a one-way valve 4 is connected between the liquid outlet 1-1 and the liquid inlet 1-2 of the liquid pump 1. The one-way valve 4 allows unidirectional flow from the liquid inlet 1-2 to the liquid outlet 1-1, and is used to release pressure when the liquid pump reverses. An anti-clogging throttle 5 is also connected between the liquid outlet 1-1 and the liquid inlet 1-2 of the liquid pump 1, used to release pressure when the liquid cylinder throttle 2 is blocked. The anti-clogging throttle 5 is a commercially available throttle and is used when adjusted to the minimum opening position to prevent the liquid pump 1 from blocking.

[0050] It should also be noted that in the description of this utility model, directional terms such as "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature, and in this description of the utility model, "at least" means one or more, unless otherwise explicitly specified.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] In this utility model, unless otherwise specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "below," and "over" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Above," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] Based on the above description of the structure and principle, those skilled in the art should understand that this utility model is not limited to the specific embodiments described above. Improvements and substitutions made using techniques known in the art based on this utility model all fall within the protection scope of this utility model, which should be defined by the claims and their equivalents. Parts not described in the specific embodiments are all prior art or common knowledge.

Claims

1. A flexible liquid reservoir, characterized in that, It includes a flexible inner tube made of soft material and a spring-shaped metal outer tube. The flexible inner tube is inserted inside the spring-shaped metal outer tube and is wrapped by the spring-shaped metal outer tube. The spring-shaped metal outer tube is a tension spring structure used to protect the flexible inner tube and dissipate heat from the flexible inner tube.

2. The soft liquid reservoir according to claim 1, characterized in that, The flexible inner tube is a rubber tube or a silicone tube, and the two ends of the flexible inner tube form liquid storage interface ends, which are used to connect to rigid liquid delivery pipes.

3. The soft liquid reservoir according to claim 1 or 2, characterized in that, Both ends of the flexible inner tube extend out of the spring-shaped metal outer tube.

4. The soft liquid reservoir according to claim 1, characterized in that, The outer diameter of the flexible inner tube is the same as the inner diameter of the spring-shaped metal outer tube, and the flexible inner tube is inserted into the spring-shaped metal outer tube.

5. The soft liquid reservoir according to claim 1, characterized in that, The flexible inner tube is a vacuum tube.

6. A liquid-filled inverted compression speed limiting system, characterized in that, The device includes a liquid pump, the shaft of which is connected to the rotating shaft of a traveling mechanism and rotates under the drive of the rotating shaft of the traveling mechanism; a liquid cylinder throttle and a soft liquid reservoir as described in any one of claims 1-5 are sequentially connected from the liquid outlet to the liquid inlet of the liquid pump; the liquid cylinder throttle includes a liquid cylinder, a throttle valve, and a piston return spring; the cylinder rod of the liquid cylinder is driven to the valve core of the throttle valve through a transmission mechanism; the liquid outlet of the liquid pump is connected to the liquid cylinder and the throttle valve through two branches respectively; and the piston return spring provides a return force to the piston of the liquid cylinder in the opposite direction to the hydraulic thrust.

7. A liquid-insulated compression speed limiting system according to claim 6, characterized in that, A speed limiting adjustment device is connected to the piston. The speed limiting adjustment device includes a speed limiting adjustment handle and a screw. The screw is threaded to the piston and extends out of the liquid cylinder to form a sliding connection with the liquid cylinder. The speed limiting adjustment handle is installed on the protruding end of the screw. The piston return spring is connected between the speed limiting adjustment handle and the outer wall of the liquid cylinder.

8. A liquid-filled inverted compression speed limiting system according to claim 6, characterized in that, The transmission mechanism is a gear and rack mechanism, with a gear connected to the valve core and a rack connected to the piston rod that meshes with the gear; when the piston moves back and forth, the piston rod drives the rack to move back and forth, thereby driving the gear to rotate, thus realizing the rotation of the valve core.

9. A liquid-filled inverted compression speed limiting system according to claim 6, characterized in that, A one-way valve is connected between the liquid outlet and the liquid inlet of the liquid pump. The one-way valve is unidirectionally open from the liquid inlet to the liquid outlet to release pressure when the liquid pump reverses. An anti-blockage throttle is connected between the liquid outlet and the liquid inlet of the liquid pump to release pressure when the liquid cylinder throttle is blocked.

10. A liquid-filled inverted compression speed limiting system according to claim 6, characterized in that, The walking mechanism is a wheelchair, stroller, rehabilitation walker, or elderly assistive vehicle.

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