A liquid internal pressure measurement experimental device

Abstract

The utility model discloses a liquid internal pressure measurement experimental device, specifically at measurement technical field. The utility model discloses a liquid internal pressure measurement experimental device, including base, the upper fixed joint of base has the ratchet bar, adopts the one -way locking structure of ratchet bar and pawl cooperation, the linkage design of collocating pressing piece and spring, realizes the convenient adjustment and firm locking of probe depth, when the experiment, only need to press the pressing piece on the sliding platform, can promote the guide rail and drive pawl rotation, make it separate ratchet bar and realize the unlocking, then the sliding platform can along the guide pillar smoothly slide, the depth of accurate adjustment probe immerses liquid. Loosen the spring of pressing piece between the limiting seat and the automatic reset, pull pawl and ratchet bar tight and tightly connect, and this structure has reduced the data deviation of the same depth multiple measurement significantly, has improved the repeatability and stability of experimental measurement greatly.

Description

Technical Field

[0001] This utility model relates to the field of measurement, and in particular to an experimental device for measuring the internal pressure of a liquid. Background Technology

[0002] In the fields of physics teaching and basic scientific research, the experimental device for measuring internal pressure of liquids is a core tool for exploring the relationship between liquid pressure and depth, direction, and liquid density. Its core principle is based on the laws of fluid statics, and the pressure inside the liquid is directly reflected by the height difference of the liquid surface through the U-tube manometer. With the help of the adjustable depth probe assembly, pressure data can be collected under different experimental conditions.

[0003] Traditional devices rely on manual hand-held probes to be immersed in liquid. During the experiment, one person needs to hold the probe continuously to keep the depth and direction stable, while another person reads the height difference of the liquid level in the U-tube, which requires the cost of two people to operate. Moreover, after a single measurement is completed, the depth and direction need to be readjusted and the system needs to be zeroed again. The operation process is cumbersome and it is difficult to quickly complete multiple sets of comparative experiments. Utility Model Content

[0004] The main purpose of this invention is to provide an experimental device for measuring the internal pressure of a liquid, which can effectively solve the problem of low measurement efficiency caused by the cumbersome operation of traditional devices.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An experimental device for measuring the internal pressure of a liquid includes a base, a ratchet rack fixedly connected to the top of the base, a guide post fixedly connected to the front of the ratchet rack, a support frame fixedly connected to the top of both the guide post and the ratchet rack, a sliding platform slidably connected to the outside of the guide post, a connecting rod rotatably connected to the front of the sliding platform, a probe rotatably connected to the other end of the connecting rod, a U-tube manometer fixedly connected to the outside of the ratchet rack on the base, a pressure relief assembly fixedly connected to the pressure-conducting end of the U-tube manometer, and a rubber tube provided at the other end of the pressure relief assembly, which is connected to the probe through the rubber tube.

[0007] Preferably, the sliding platform includes a slide table, which is slidably connected to a guide post. A pawl is rotatably connected to the rear of the slide table. The bottom of the pawl engages with a ratchet rack, and a guide rail is slidably connected to the top of the pawl.

[0008] Preferably, a pressing member is fixedly connected to the front of the guide rail, the pressing member is slidably connected to the slide table, a limiting seat is fixedly connected to the inner side of the pressing member on the slide table, and a spring is provided between the limiting seat and the pressing member.

[0009] Preferably, the probe includes a needle tube, which is rotatably connected to a connecting rod. A fixed seat is fixedly connected to the top of the needle tube. A worm gear is rotatably connected inside the fixed seat. A transmission shaft is rotatably connected inside the needle tube. A worm wheel is fixedly connected to the top of the transmission shaft. The worm wheel meshes with the worm gear. An adjustment knob is fixedly connected to the outside of the fixed seat.

[0010] Preferably, the needle tube is rotatably connected to a second drive shaft at the bottom of the first drive shaft. Both the first and second drive shafts are equipped with bevel gears, and the drive shafts are driven by the bevel gears. The probe is fixedly connected to the outside of the second drive shaft.

[0011] Preferably, the pressure relief assembly includes a guide tube, the upper and lower ends of which are connected to a rubber tube and a U-tube pressure gauge, respectively. A pressure relief pipe is provided on the side of the guide tube, and a pressure relief valve stem is slidably connected to the pressure relief pipe. A return spring is provided at the tail end of the pressure relief valve stem.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This utility model provides an experimental device for measuring the internal pressure of a liquid. It employs a one-way locking structure with a ratchet rack and pawl, combined with a linkage design between a pressing element and a spring. This allows for convenient adjustment and stable locking of the probe depth. During the experiment, simply pressing the pressing element on the sliding platform pushes the guide rail, causing the pawl to rotate and disengage from the ratchet rack, thus unlocking the device. The sliding platform can then smoothly slide along the guide post, precisely adjusting the probe's immersion depth in the liquid. After releasing the pressing element, the spring between the limiting seat and the pressing element automatically resets, pulling the pawl back to rotate and tightly engage with the ratchet rack. This structure significantly reduces data deviation from multiple measurements at the same depth, greatly improving the repeatability and stability of experimental measurements, and meeting the accuracy requirements of experimental data in teaching.

[0014] 2. This utility model provides an experimental device for measuring the internal pressure of a liquid. During the zeroing operation of the U-tube manometer, pressing the pressure relief valve stem of the pressure relief component quickly connects the pressure relief pipe on the side of the guide tube, balancing the internal air pressure of the U-tube and achieving rapid zeroing of the liquid level. After releasing the pressure relief valve stem, the return spring at its tail end automatically pushes the valve stem back to its original position, reliably isolating the pressure relief pipe from the outside and ensuring the airtightness of pressure transmission. Simultaneously, when adjusting the probe direction, there is no need to manually rotate the probe or bend the rubber tube; simply rotating the adjustment knob on the outside of the fixed base drives the worm gear to rotate. The meshing transmission between the worm gear and the worm wheel drives the first transmission shaft to rotate, which in turn drives the second transmission shaft and the probe to rotate smoothly via a bevel gear, easily completing pressure detection at the same depth in different directions. The overall operation process is simple and efficient, lowering the operational threshold for students and meeting the needs of high-frequency demonstrations and student-led experiments in middle school physics classrooms. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the sliding platform of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the probe top of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the bottom of the probe of this utility model;

[0019] Figure 5 This is a schematic diagram of the pressure relief component of this utility model.

[0020] In the diagram: 1. Base; 2. Probe; 3. Connecting rod; 4. Sliding platform; 5. Ratchet; 6. Support frame; 7. Guide post; 8. U-tube pressure gauge; 9. Pressure relief assembly; 21. Adjustment knob; 22. Fixed seat; 23. Worm gear; 24. Worm wheel; 25. Drive shaft one; 26. Needle tube; 27. Drive shaft two; 28. Probe; 41. Slide table; 42. Guide rail; 43. Pawl; 44. Pressing element; 45. Limit seat; 91. Guide tube; 92. Pressure relief valve stem; 93. Return spring. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] like Figure 1 As shown, this utility model provides an experimental device for measuring the internal pressure of a liquid, including a base 1, a ratchet rack 5 fixedly connected to the top of the base 1, and a guide post 7 fixedly connected to the front of the ratchet rack 5. Support frames 6 are fixedly connected to the top of both the guide post 7 and the ratchet rack 5. A sliding platform 4 is slidably connected to the outside of the guide post 7. A connecting rod 3 is rotatably connected to the front of the sliding platform 4, and a probe 2 is rotatably connected to the other end of the connecting rod 3. A U-tube manometer 8 is fixedly connected to the outside of the ratchet rack 5 on the base 1. A pressure relief assembly 9 is fixedly connected to the pressure-conducting end of the U-tube manometer 8, and the other end of the pressure relief assembly 9 is provided with... A rubber tube is connected to the probe 2. The base 1 serves as the supporting foundation of the device. A ratchet 5 and a guide post 7 are fixedly connected on the top. The two are arranged in parallel and both are fixed at the top by a support frame 6 to form a stable longitudinal adjustment frame, which prevents the guide post 7 and the ratchet 5 from shifting during use. A sliding platform 4 is slidably fitted on the outside of the guide post 7. The front of the sliding platform 4 is rotatably connected to one end of the connecting rod 3 through a rotating shaft. The other end of the connecting rod 3 is rotatably connected to the middle of the probe 2. When the sliding platform 4 slides up and down along the guide post 7, the probe 2 can be driven to rise and fall synchronously through the connecting rod 3 to adjust the immersion depth of the probe 28.

[0023] like Figure 2 As shown, this utility model provides an experimental device for measuring the internal pressure of a liquid. The sliding platform 4 includes a slide 41, which is slidably connected to the guide post 7. A pawl 43 is rotatably connected to the rear of the slide 41. The bottom of the pawl 43 engages with a ratchet rack 5. A guide rail 42 is slidably connected to the top of the pawl 43. A pressing member 44 is fixedly connected to the front of the guide rail 42. The pressing member 44 is slidably connected to the slide 41. A limiting seat 45 is fixedly connected to the inner side of the pressing member 44 on the slide 41. A spring is provided between the limiting seat 45 and the pressing member 44. The inner side of the slide 41 is slidably engaged with the guide post 7, allowing it to slide smoothly along the guide post 7. Lifting; the slide 41 is rotatably connected to the pawl 43 via a pin. The bottom of the pawl 43 is designed to engage with the ratchet teeth of the rack 5. In the initial state, the bottom of the pawl 43 engages with the rack 5, restricting the slide 41 from sliding independently. When the pressing part 44 is released, the spring releases its elastic potential energy to push the pressing part 44 to reset. The pressing part 44 drives the guide rail 42 to retract. The pawl 43 rotates under its own weight and the tension of the guide rail 42, and its bottom re-engages with the ratchet teeth of the rack 5. Due to the unidirectional force characteristic of the ratchet teeth, it only restricts the slide 41 from sliding downward, ensuring stable depth locking, while facilitating subsequent upward adjustment of the depth.

[0024] like Figure 3 As shown, this utility model provides an experimental device for measuring the internal pressure of a liquid. The probe 2 includes a needle tube 26, which is rotatably connected to a connecting rod 3. A fixed base 22 is fixedly connected to the top of the needle tube 26. A worm gear 23 is rotatably connected inside the fixed base 22. A transmission shaft 25 is rotatably connected inside the needle tube 26. A worm wheel 24 is fixedly connected to the top of the transmission shaft 25. The worm wheel 24 meshes with the worm gear 23. An adjustment knob 21 is fixedly connected to the outside of the fixed base 22. Because the transmission ratio between the worm gear 23 and the worm wheel 24 is fixed, the rotation of the adjustment knob 21 can be converted into the slow rotation of the worm wheel 24 through the worm gear 23, thereby driving the transmission shaft 25 to rotate smoothly. This avoids the probe 28 from being misaligned due to excessive rotation speed. Furthermore, the worm gear 23 can drive the worm wheel 24 to rotate, but the worm wheel 24 cannot drive the worm gear 23 in the opposite direction. Therefore, after the probe 28 is adjusted to the target direction, it will not deflect due to liquid impact or vibration, ensuring the stability of pressure measurement at the same depth in different directions.

[0025] like Figure 4As shown, this utility model provides an experimental device for measuring the internal pressure of a liquid. A needle tube 26 is rotatably connected to a second transmission shaft 27 at the bottom of a first transmission shaft 25. Both the first transmission shaft 25 and the second transmission shaft 27 are equipped with bevel gears, which drive the transmission. A probe 28 is fixedly connected to the outside of the second transmission shaft 27. The second transmission shaft 27 is rotatably mounted inside the bottom of the needle tube 26 through a bearing. The second transmission shaft 27 is horizontally arranged, with one end extending to the outside of the needle tube 26 and fixedly connected to the probe 28, and the other end meshing with the bottom of the first transmission shaft 25 through a bevel gear. The bottom of the first transmission shaft 25 is fixed with a driving bevel gear, and the end of the second transmission shaft 27 is fixed with a driven bevel gear. The two bevel gears have the same number of teeth and matched modules, forming a steering transmission mechanism.

[0026] like Figure 5 As shown, this utility model provides an experimental device for measuring the internal pressure of a liquid. The pressure relief component 9 includes a guide tube 91, the upper and lower ends of which are connected to a rubber tube and a U-tube pressure gauge 8, respectively. A pressure relief pipe is provided on the side of the guide tube 91, and a pressure relief valve rod 92 is slidably connected to the pressure relief pipe. A return spring 93 is provided at the tail end of the pressure relief valve rod 92. The upper end of the vertical channel of the guide tube 91 is connected to the probe 28 through a rubber tube, and the lower end is fixedly connected to the pressure-conducting end of the U-tube pressure gauge 8, forming the main pressure transmission path. The horizontal channel is a pressure relief pipe, with one end connected to the outside and the other end internally fitted with a pressure relief valve stem 92. A sealing ring is provided on the outside of the pressure relief valve stem 92 to ensure the sealing of the pressure relief pipe when not in operation. A return spring 93 is fitted at the tail end of the pressure relief valve stem 92. One end of the return spring 93 abuts against the limiting step of the pressure relief valve stem 92, and the other end abuts against the fixed bracket. In the initial state, the return spring 93 is in a naturally extended state, pushing the pressure relief valve stem 92 to block the connection between the pressure relief pipe and the vertical channel in the guide pipe 91, ensuring the sealing of the main pressure transmission passage.

[0027] The working principle of this liquid internal pressure measurement experimental device will be explained in detail below.

[0028] like Figure 1-5As shown, in the initial stage of the experiment, the operator presses the pressing part 44 on the sliding platform 4. The pressing part 44 moves towards the limiting seat 45 and squeezes the spring between them. At the same time, the guide rail 42 fixedly connected behind the pressing part 44 synchronously pushes the pawl 43 rotatably connected on the sliding table 41 to rotate, so that the bottom of the pawl 43 is disengaged from the ratchet rack 5. At this time, the sliding platform 4 is unlocked and can slide freely along the guide post 7 fixed above the base 1. Then, the operator pushes the sliding platform 4 to move downward along the guide post 7. The sliding platform 4 drives the probe 2 to move downward synchronously through the rotating connecting rod 3 until the probe 28 of the probe 2 is immersed to the target depth of the liquid being measured. The support frame fixed at the top of the guide post 7 and the ratchet rack 5... 6. The maximum sliding stroke of the sliding platform 4 can be limited to avoid excessive displacement of components. When the probe 28 reaches the target depth, the adjustment knob 21 on the outside of the top fixing seat 22 of the probe 2 is rotated. The adjustment knob 21 drives the worm gear 23 connected inside the fixing seat 22 to rotate synchronously. Since the worm gear 23 meshes with the worm wheel 24 fixed on the top of the transmission shaft 25, the rotation of the worm gear 23 will drive the worm wheel 24 and the transmission shaft 25 to rotate. The transmission shaft 25 is installed inside the needle tube 26, and its bottom is connected to the transmission shaft 27 through a bevel gear, thereby driving the transmission shaft 27 to rotate. Finally, the probe 28 fixedly connected to the outside of the transmission shaft 27 rotates. By adjusting the orientation of the probe 28, the same depth can be achieved. The pressure signal is detected by the probe 28 and transmitted to the subsequent pressure measuring component. When the probe 28 reaches the preset depth, the operator releases the pressing part 44. At this time, the spring squeezed between the limit seat 45 and the pressing part 44 releases its elastic potential energy, pushing the pressing part 44 to reset outward. The pressing part 44 drives the guide rail 42 to move in the opposite direction, thereby pulling the pawl 43 to rotate, so that the bottom of the pawl 43 re-engages with the ratchet rack 5. The pressure signal is transmitted through the probe 28 to the pressure relief component 9 via the rubber tube. The upper end of the guide tube 91 of the pressure relief component 9 is connected to the rubber tube, and the lower end is fixedly connected to the pressure guide end of the U-shaped tube pressure gauge 8 fixed on the base 1, which can transmit the pressure detected by the probe 28. The pressure is reflected by the difference in liquid level within the U-tube manometer 8. To zero the U-tube manometer 8, press the pressure relief valve rod 92, which is slidably connected to the pressure relief pipe on the guide pipe 91, to connect the pressure relief pipe to the outside and quickly balance the air pressure inside the U-tube manometer 8. After the zeroing operation is completed, release the pressure relief valve rod 92. The return spring 93 at the end of the pressure relief valve rod 92 releases its elastic force, pushing the pressure relief valve rod 92 to reset, thus reconnecting the pressure relief pipe to the outside air and ensuring the sealing of the U-tube manometer 8. This ensures the accuracy of subsequent pressure measurements. After the experimental reset and a single measurement are completed, push the sliding platform 4 to slide upward along the guide post 7, causing the probe 2 to detach from the liquid, completing the experimental reset and preparing for the next measurement.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An experimental device for measuring the internal pressure of a liquid, comprising a base (1), characterized in that: A ratchet rack (5) is fixedly connected above the base (1), and a guide post (7) is fixedly connected in front of the ratchet rack (5). A support frame (6) is fixedly connected to the top of both the guide post (7) and the ratchet rack (5). A sliding platform (4) is slidably connected to the outside of the guide post (7). A connecting rod (3) is rotatably connected to the front of the sliding platform (4). A probe (2) is rotatably connected to the other end of the connecting rod (3). A U-tube manometer (8) is fixedly connected to the outside of the ratchet rack (5) on the base (1). A pressure relief assembly (9) is fixedly connected to the pressure-conducting end of the U-tube manometer (8). A rubber tube is provided at the other end of the pressure relief assembly (9), and it is connected to the probe (2) through the rubber tube.

2. The experimental apparatus for measuring the internal pressure of a liquid according to claim 1, characterized in that: The sliding platform (4) includes a slide (41), which is slidably connected to the guide post (7). A pawl (43) is rotatably connected to the rear of the slide (41). The bottom of the pawl (43) is engaged with the ratchet rack (5), and the top of the pawl (43) is slidably connected to the guide rail (42).

3. The experimental apparatus for measuring the internal pressure of a liquid according to claim 2, characterized in that: A pressing member (44) is fixedly connected to the front of the guide rail (42). The pressing member (44) is slidably connected to the slide (41). A limiting seat (45) is fixedly connected to the inner side of the pressing member (44) on the slide (41). A spring is provided between the limiting seat (45) and the pressing member (44).

4. The experimental apparatus for measuring the internal pressure of a liquid according to claim 3, characterized in that: The probe (2) includes a needle tube (26), which is rotatably connected to a connecting rod (3). A fixed seat (22) is fixedly connected to the top of the needle tube (26). A worm gear (23) is rotatably connected inside the fixed seat (22). A drive shaft (25) is rotatably connected inside the needle tube (26). A worm wheel (24) is fixedly connected to the top of the drive shaft (25). The worm wheel (24) meshes with the worm gear (23). An adjustment knob (21) is fixedly connected to the outside of the fixed seat (22) of the worm gear (23).

5. The experimental apparatus for measuring the internal pressure of a liquid according to claim 4, characterized in that: The needle tube (26) is rotatably connected to the bottom of the first transmission shaft (25) and the second transmission shaft (27). Both the first transmission shaft (25) and the second transmission shaft (27) are provided with bevel gears and are driven by the bevel gears. The probe (28) is fixedly connected to the outside of the second transmission shaft (27).

6. The experimental apparatus for measuring the internal pressure of a liquid according to claim 4, characterized in that: The pressure relief assembly (9) includes a guide tube (91), the upper and lower ends of which are connected to a rubber tube and a U-tube pressure gauge (8) respectively. A pressure relief tube is provided on the side of the guide tube (91), and a pressure relief valve rod (92) is slidably connected on the pressure relief tube. A return spring (93) is provided at the tail end of the pressure relief valve rod (92).

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