Flat plate type momentum water tank

Abstract

The flat plate type momentum water tank comprises a water tank assembly, a large flat plate assembly is arranged in the water tank assembly, and the water tank assembly comprises a water tank, a front cover plate and a rear cover plate. The top of the water tank is fixedly connected with the rear cover plate through screws; the front cover plate is movably mounted at the top of the water tank; a spray pipe, a water collecting pipe and a bottom water outlet are arranged on the water tank; the large flat plate assembly comprises a large flat plate which is vertically mounted in the water tank through four-edge shafts on the left and right side surfaces of the water tank, and the upper end of the large flat plate is higher than a water tank cover plate and can be in contact with the dynamometer; an impact flat plate is arranged on the rear side of the large flat plate, a groove is formed in the top of the impact flat plate, and the groove is connected with a left percussion button in a buckled mode; the device is reasonable in structural design, and can accurately measure the flow so as to accurately measure the water flow momentum force.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of fluid mechanics especially relates to a flat plate type momentum water tank. BACKGROUND

[0002] Fluid mechanics is widely used in industry, agriculture, transportation, aerospace and other aspects. Momentum law experiment is a classic experiment in fluid mechanics, and momentum law experiment instrument is an important instrument for verifying fluid momentum equation. Fluid momentum conservation is verified through momentum law experiment, which is used to solve the impact force of fluid on solid wall.

[0003] At present, in the fluid mechanics experiment teaching of colleges and universities, the momentum law experiment is always taken as a compulsory experiment due to its importance. The flat plate type water tank part of the traditional momentum law experiment instrument adopts the structure that the force moment is measured by adjusting the size of the flow and the force moment generated by the balance of the force moment after the weight is hung, and then the momentum force is calculated by measuring the jet flow to verify the force moment. This structure can only make simple qualitative demonstration and calculation, because the resistance of water flow from the water outlet at the bottom of the water tank to the downward straight impact is different from that of water flow from the horizontal pipeline, under the condition that the flow of the nozzle is constant. The flow is measured by timing measurement through the interval time of opening and closing the valve by two persons. The opening and closing of the water outlet valve make the water flow path different, the water outlet resistance different, the water amount remaining in the water tank cannot be kept constant and the water surface fluctuates seriously, so the flow in the control time cannot be measured correctly. When the flow of the nozzle changes, the test parameters also change. Due to the limitation of the structure design, the measurement error is relatively large, so the experimental results cannot quantitatively verify the momentum law. The utility model provides a new type of flat plate type momentum water tank, which improves the flow measurement accuracy and can measure the momentum force under any flow. SUMMARY

[0004] The utility model aims at providing a flat plate type momentum water tank which is reasonable in structure design, convenient to use and can verify data under various flows.

[0005] The utility model aims at realizing the following: a flat plate type momentum water tank, including water tank subassembly, the water tank subassembly is provided with big flat plate subassembly in, the water tank subassembly includes water tank, front cover and back cover, the water tank top is fixedly connected with back cover through screw, and front cover is movably installed at the water tank top, the water tank is provided with nozzle, water collecting pipe and water outlet at lower end, the big flat plate subassembly includes big flat plate, and the big flat plate is vertically installed in the water tank through four prism shafts of left and right sides of the water tank, and the upper end of the big flat plate is out of the water tank and contacts with the force meter, the back side of the big flat plate is provided with impact flat plate, the top of the impact flat plate is provided with recess, and the recess is connected with left trigger button snap fit.

[0006] As a further preferred scheme of the utility model, the force gauge assembly comprises a force gauge support and a force gauge, the force gauge support is installed on the back cover plate through screws, the force gauge is installed on the force gauge support through screws, a screw rod is arranged inside the force gauge support, and the screw rod is opposite to the pressure bearing plate. The screw rod on the force gauge support can be adjusted in front and back positions through the screw hole at the front end of the support and the light hole at the rear end.

[0007] As a further preferred scheme of the utility model, the upper end of the large plate is provided with a left button spring, a right button spring, a left trigger button and a right trigger button; and the left trigger button and the right trigger button are fixed on the positioning block by the left button spring and the right button spring.

[0008] As a further preferred scheme of the utility model, the impact plate is provided with a pin shaft at the upper end, the pin shaft is connected with one end of the tension spring through the large plate, and the other end of the tension spring is connected with the spring pull rod.

[0009] As a further preferred scheme of the utility model, the large plate is provided with a knob seat, the knob seat is provided with a waist round guide groove, and the waist round guide groove is provided with a locking knob.

[0010] As a further preferred scheme of the utility model, the lower end of the large plate is provided with a screw and a nut for counterweight.

[0011] As a further preferred scheme of the utility model, the water collecting pipe is in a sectional contraction shape inside the water tank, the section changes from large to small, and a water retaining step is arranged below the water inlet end face.

[0012] As a further preferred scheme of the utility model, the spring pull rod is manually slid from one end to the other end of the waist round guide groove of the knob seat in cooperation with the locking knob.

[0013] Compared with the prior art, the utility model has the beneficial effects as follows:

[0014] 1. The trigger button mechanism is used to measure the flow, single person operation, and high measurement accuracy.

[0015] 2. The strain type force gauge is used, and the balance does not need to be adjusted, various flows can be measured, and the measurement is fast.

[0016] 3. The force gauge protection device can protect the force gauge and reduce the maintenance cost.

[0017] 4. The four-rib shaft is used as the large plate support shaft, and the measurement accuracy is higher. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present utility model, the drawings needed to be used in the embodiment technical description will be simply introduced below, obviously, the drawings described below are only some embodiments of the present utility model, and for the ordinary skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0019] Figure 1 It is a structure schematic diagram of the present utility model.

[0020] Figure 2 It is Figure 1 It is a left view structure schematic diagram.

[0021] Figure 3 It is Figure 1 It is a partial enlarged schematic diagram.

[0022] Figure 4 It is a large flat plate assembly structure schematic diagram.

[0023] Figure 5 It is a four-rib shaft structure schematic diagram.

[0024] Figure 6 It is a structure schematic diagram of the fifth embodiment.

[0025] Figure 7 It is Figure 6 It is an A-A structure schematic diagram.

[0026] 1 - water tank, 2 - large flat plate, 3 - impact flat plate, 4 - knob seat, 5 - protection pressure plate, 6 - front cover plate, 7 - right trigger button, 8 - left trigger button, 9 - right button spring, 10 - left button spring, 11 - water collecting pipe, 12 - rear cover plate, 13 - spray pipe, 14 - tension spring, 15 - spring pull rod, 16 - locking knob, 17 - four-rib shaft, 18 - button pin shaft, 19 - pin shaft screw, 20 - dynamometer, 21 - dynamometer support, 22 - screw rod, 23 - screw, 24 - nut, 26 - support shaft, 27 - hand wheel core shaft, 28 - positioning nut, 29 - knob, 30 - steel ball spring, 31 - positioning steel ball, 32 - cam. DETAILED DESCRIPTION

[0027] The technical scheme in the embodiments of the present utility model will be described clearly and completely below in combination with the drawings in the embodiments of the present utility model, obviously, the described embodiments are only some embodiments of the present utility model, and not all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the present utility model. EMBODIMENT

[0028] As Figure 1As shown, the front cover plate 6 directly covers the water tank 1, and the rear cover plate 12 is installed on the water tank 1 with screws. The nozzle 13 is inserted into the water tank through the hole in the front wall of the water tank 1, directly opposite the elongated hole and water collection pipe 11 of the large plate. The water collection pipe 11 passes through the hole in the rear wall of the water tank 1 and is fixed. The four-sided shaft 17 is connected to the water tank 1 by threads, and the large plate assembly is supported on the four-sided shaft 17. The lower end of the large plate 2 has a counterweight nut 24 for balancing the large plate. The left firing button 8 and the right firing button 7 are hinged to the large plate 2 by the button pin 18. The left button spring 10 and the right button spring 9 are also installed on the large plate 2 by the button pin 18. The left firing button 8 and the right firing button 7 are pressed against the two positioning blocks of the large plate 2 by the left button spring 10 and the right button spring 9.

[0029] There are two symmetrical fixed positioning blocks on the upper side of the large plate 2 near the force gauge. Example

[0030] like Figure 2 As shown, the knob seat 4 is mounted on the other side of the large plate 2 and fixed with screws. The knob seat 4 has a semi-circular guide groove, and the threaded end of the spring pull rod 15 passes through the guide groove to cooperate with the locking knob 16. Example

[0031] like Figure 4 As shown, the impact plate 3 is hinged to the large plate 2 by a pin and can swing at a certain angle. A fixed short shaft extends from the upper middle part of the impact plate 3, passing through an arc groove on the large plate 2. One end of the tension spring 14 is connected to the short shaft of the impact plate, and the other end is connected to the spring rod 15. There is a groove at the upper end of the impact plate 3. The hooks of the left firing button 8 and the right firing button 7 can be inserted into the upper groove and hooked to position the impact plate 3 when it is in the left and right extreme positions. The two extreme positions of the impact plate 3 are positioned by the two positioning blocks on the large plate and the left firing button 8 and the right firing button 7.

[0032] The impact plate 3 has two extreme working positions. In each extreme position, it is positioned by hooking the upper groove of one of the left firing button 8 or the right firing button 7. Example

[0033] like Figure 5 As shown, the central part of the four-sided shaft 17 is threaded for connecting to the water tank 1. The part supporting the large plate is designed in a knife-edge shape. During installation, the knife edge is oriented horizontally and vertically. This structure allows horizontal forces to act on the horizontal knife edge, unaffected by the weight of the large plate component, thus improving the accuracy of experimental data.

[0034] To improve the accuracy of force measurement, the force gauge range selection should be appropriate, not to choose a large range, so that the force gauge will be overloaded and damaged when the water jet suddenly impact the large plate assembly, the force gauge is provided with a protection device. In the force measurement, the screw 22 inside the force gauge support retracts and has a gap with the large plate in the separation position, and the force gauge top head is in contact with the large plate 2. In the non-force state, the screw moves forward and contacts the protective pressure plate 5 on the large plate, so that the force gauge top head is in a disengaged position with the large plate 2, preventing the overload caused by water impact from acting on the force gauge and damaging the force gauge. The forward and backward movement of the screw is adjusted by rotating the hand wheel at the rear end of the screw 22 to adjust the position of the screw 22. Embodiment

[0035] Another form of force gauge protection scheme is a cam mechanism: see Figure 6 The rear end of the (cam type) force gauge support 25 is provided with a cam 32, the right side of the cam is provided with a support shaft 26, and the left end is provided with a hand wheel core shaft 27. The hand wheel core shaft 27 and the cam shaft 32 are connected by a square hole to transmit torque, and the hand wheel core shaft 27 has a step in the middle, which is axially positioned by a positioning nut 28. The hand wheel core shaft 27 is positioned by a pin shaft and a knob 29, and the rotation adjustment of the hand wheel is transmitted to the hand wheel core shaft 27 and then to the cam 32. The axial positioning of the knob 29 is achieved by the steel ball spring 30 installed inside the knob 29 and the positioning steel ball 31 on the concave pit on the matching surface of the force gauge support and the hand wheel. When the positioning steel ball 31 falls into the concave pit of the force gauge support, it can be positioned. The position of the force gauge support and the large plate can be adjusted by the long hole on the bottom of the force gauge support.

[0036] Working process and principle: as Figure 4 , the impact plate 3 is hooked by the right trigger button 7, and the water inlet is in the open state. (See Figure 2) Locking knob 16 along the guide slot to the left end and lock, stretch spring 14 one end of the follow-up to the left end. Press the right trigger button 7, impact plate 3 under the action of the stretch spring 14 is pulled to the left end while being hooked by the left trigger button 8, the water outlet is closed. Locking knob 16 along the guide slot to the right end and lock. Adjusting screw 22 against the big plate 2. Start the water pump (not shown in the figure), adjust the size of the flow, so that the flow of water impact plate. To be stable flow, adjusting screw retreat, so that the big plate against the force gauge probe, record the data of the force gauge, with the timing of the stopwatch start button impact left trigger button 8, start timing, while the left trigger button 8 rotates, off the impact plate 3 on the upper end of the groove, impact plate 3 under the action of the stretch spring 14 open water outlet, water flow into the water collecting pipe into the water collecting container. Unlock the locking knob 16, along the guide slot to the left end and lock. Adjusting screw 22 against the big plate 2. With the timing of the stopwatch stop button impact right trigger button 7, timing end, impact plate under the action of the spring closed water outlet, the weight of the collected water to calculate the flow.

[0037] Change the flow of the nozzle, unlock the locking knob 16, along the guide slot to the left end and lock, press the right trigger button 7, close the water outlet, adjusting screw retreat, so that the big plate against the force gauge, flow stable record measurement force data, adjust the screw against the big plate. Unlock the locking knob 16, along the guide slot to the right end and lock. Then according to the above steps, with the timing of the stopwatch button 8 button impact start timing and collect water.

[0038] The above, only for the specific embodiments of the present application, but the scope of the present application is not limited to this, any skilled in the art within the scope of the present application disclosed, can easily think of changes or replacement, should be covered in the scope of the present application.

Claims

1. A flat plate momentum tank comprising a tank assembly, a large flat plate assembly is arranged in the tank assembly, characterized in that: The water tank assembly comprises a water tank (1), a front cover plate (6) and a rear cover plate (12); the water tank (1) is fixedly connected with the rear cover plate (12) at the top by screws, and the front cover plate (6) is movably installed at the top of the water tank (1); the water tank (1) is provided with a spray pipe (13), a water collecting pipe (11) and a water outlet at the lower end; the large flat plate assembly comprises a large flat plate (2) which is vertically installed in the water tank (1) through four prismatic shafts (17) on the left and right sides of the water tank (1), and the upper end of the large flat plate (2) extends out of the water tank (1) and contacts with a dynamometer; an impact flat plate (3) is arranged at the rear side of the large flat plate (2), and a recess is arranged at the top of the impact flat plate (3) and is connected with a left trigger button (8) in a buckling manner.

2. A flat plate momentum tank according to claim 1, characterized in that: The dynamometer assembly comprises a dynamometer support (21) and a dynamometer (20); the dynamometer support (21) is installed on the rear cover plate (12) by screws, and the dynamometer (20) is installed on the dynamometer support (21) by screws; a screw rod (22) is arranged in the interior of the dynamometer support (21) and faces the protection pressure plate (5).

3. A flat plate momentum tank according to claim 1, characterized in that: The upper end of the large flat plate (2) is provided with a left button spring (10), a right button spring (9), a left trigger button (8) and a right trigger button (7); the left trigger button (8) and the right trigger button (7) are pressed against the positioning block by the left button spring (10) and the right button spring (9).

4. A flat plate momentum tank according to claim 1, characterized in that: The upper end of the impact flat plate (3) is provided with a pin shaft which is connected with one end of a tension spring (14) through the large flat plate, and the other end of the tension spring (14) is connected with a spring pull rod (15).

5. A flat plate momentum tank according to claim 1, characterized in that: A knob seat (4) is arranged on the large flat plate (2), a waist round guide groove is arranged on the knob seat (4), and a locking knob (16) is arranged in the waist round guide groove.

6. A flat plate momentum tank according to claim 1, characterized in that: Screws (23) and nuts (24) for counterweights are arranged at the lower end of the large flat plate (2).

7. A flat plate momentum tank according to claim 1, characterized in that: The water collecting pipe (11) is in a sectional contraction shape inside the water tank (1), the section changes from large to small, and a water blocking step is arranged below the water inlet end face.

8. A flat plate momentum tank according to claim 4, characterized in that: The spring pull rod (15) and the locking knob (16) are cooperated to be manually slid from one end to the other end of the waist round guide groove of the knob seat.

9. A plate-type momentum tank according to any one of claims 1-8, characterized in that: A cam (32) is installed in the interior of the dynamometer support (21), support shafts (26) and hand wheel shafts (27) are arranged at the two sides of the cam (32) respectively, and the hand wheel shafts (27) transmit torque to the cam (32) to rotate.

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