A liquid volume change amount measuring device and method

Abstract

The application discloses a kind of liquid volume variation measurement device and method, the measurement precision of current liquid measuring device is lower, cannot satisfy the problem of high-precision measurement requirement of space propulsion agent, igniter.It specifically includes piston, piston rod, digital depth gauge, thermostat, cylindrical solution cavity and support frame;Solution cavity upper end is located outside thermostat, the rest is inserted into thermostat, its lower end is equipped with sealable inlet, and the end face at upper end is equipped with flange;Flange center is equipped with through-hole;Piston is installed in solution cavity, and is adapted with solution cavity inner wall;Piston rod lower end passes through through-hole and is inserted into solution cavity and is connected with the center of piston upper end, and upper end is coaxially detachably connected with the measuring end of digital depth gauge.Support frame is sleeved on the periphery of piston rod and digital depth gauge connection, and its upper end is connected with the horizontal port of digital depth gauge, and lower end is connected with the flange of solution cavity upper end, and support frame is used to be connected with external device, and the position of solution cavity is fixed in thermostat.

Description

TECHNICAL FIELD

[0001] The present application relates to a liquid volume measuring device, in particular to a liquid volume change measuring device and method. BACKGROUND

[0002] At present, when measuring liquid volume in the laboratory, graduated glass measuring tools such as measuring cylinders, beakers, and syringes are often used, and the precision is basically 1 mL. The volume of the measured liquid is usually less than 50 mL. The higher the measurement precision, the smaller the volume of the measured liquid. Moreover, the existing methods cannot measure the change of the volume of the liquid at different temperatures. In actual research work in the laboratory, in order to reduce measurement error, more measured samples are usually taken for measurement, but this further reduces the measurement precision. Therefore, the highest measurement precision of the existing method can only reach 0.1 mL, which cannot meet the requirements of high-precision measurement of space propellants and ignition agents. SUMMARY

[0003] The purpose of the present application is to provide a liquid volume change measuring device and method to solve the technical problem of low measurement precision of the existing liquid measuring device, which can only reach 0.1 mL and cannot meet the requirements of high-precision measurement of space propellants and ignition agents.

[0004] In order to achieve the above purpose, the present application provides a liquid volume change measuring device, which is characterized by comprising a piston, a piston rod, a digital depth gauge, a thermostat, a cylindrical solution cavity, and a support frame.

[0005] The upper end of the solution cavity is located outside the thermostat, and the rest is located inside the thermostat. A sealable inlet is provided on the lower end face of the solution cavity, and a flange is provided on the upper end face. A through hole is provided at the center of the flange.

[0006] The piston is installed in the solution cavity and cooperates with the inner wall of the solution cavity.

[0007] The lower end of the piston rod penetrates the through hole and extends into the solution cavity to connect with the upper end center of the piston. The upper end of the piston rod is connected with the measurement end of the digital depth gauge through a piston rod connector in a coaxial and detachable manner.

[0008] The support frame is sleeved on the periphery of the connection between the piston rod and the digital depth gauge. The upper end of the support frame is connected with the horizontal port of the digital depth gauge, and the lower end is connected with the flange at the upper end of the solution cavity. The support frame is used to connect with external devices to fix the position of the solution cavity in the thermostat.

[0009] Further, the support frame is a conical support frame. The large end of the conical support frame is connected with the horizontal port of the digital depth gauge, and the small end is provided with a connecting flange connected with the flange at the upper end of the solution cavity.

[0010] Further, the piston has an axial thickness of 15mm;

[0011] Two annular grooves are arranged on the outer wall of the piston around the circumference thereof; the planes where the two annular grooves are located are parallel to each other and perpendicular to the piston rod axis;

[0012] An O-shaped sealing ring is arranged in each annular groove.

[0013] Further, the O-shaped sealing ring is of type 20.9X2.65A, and the material is NBR.

[0014] Further, the digital depth gauge has a length of 120mm and an accuracy of 0.01mm.

[0015] Further, the solution cavity has an inner diameter of 25.24mm, a wall thickness of 2mm, a height of 255mm, a maximum capacity of 100mL, and is made of 06Cr19Ni10.

[0016] Further, the handle is also included.

[0017] The handle is fixedly connected to the outer wall of the piston rod by a connecting clamp, and the plane where the handle is located is perpendicular to the piston rod axis.

[0018] The handle is located in the support frame.

[0019] Further, the sealable inlet is a ball head sealing port.

[0020] Meanwhile, the application also provides a method for measuring the volume change of a liquid, which uses the above-mentioned measuring device for the volume change of a liquid, and is characterized by comprising the following steps:

[0021] Step 1. Disassemble the digital depth gauge, and take out the solution cavity from the thermostat. Draw the solution to be measured into the solution cavity through the piston rod and the piston, and invert to exhaust. After exhausting, seal the lower end of the solution cavity.

[0022] Step 2. Connect the solution cavity and the support frame through the flange, connect the support frame and the external device, and place the solution cavity in the thermostat so that the upper end of the solution cavity is located outside the thermostat. Coaxially connect the upper end of the piston rod to the measuring end of the digital depth gauge through the piston rod connector, and connect the upper end of the support frame to the horizontal port of the digital depth gauge.

[0023] Step 3. Turn on the thermostat. As the temperature in the thermostat changes, the volume of the solution to be measured in the solution cavity will increase or decrease accordingly, thereby driving the piston and the piston rod to move, so that the digital depth gauge measures the volume change of the solution to be measured in the solution cavity.

[0024] The beneficial effects of the present application are:

[0025] The present application utilizes the volume change of liquid at different temperatures to generate the change of internal pressure of liquid, drive the piston to generate rigid force conduction to the digital depth gauge for accurate measurement. The measurement accuracy of the method can reach 0.005 mL, which can meet the high-precision measurement requirements of space propellants and ignition agents. The whole measurement device has the characteristics of simple structure, convenient use, low cost, easy implementation and strong expansibility. It can also be applied to laboratory analysis, research and other high-precision experiments. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of an embodiment of a liquid volume change measurement device of the present application;

[0027] Figure 2 is a structural schematic diagram of a solution cavity in the embodiment of the present application;

[0028] Figure 3 is a structural schematic diagram of a piston in the embodiment of the present application.

[0029] REFERENCE NUMERALS

[0030] 1-piston, 11-O-shaped sealing ring, 12-annular groove, 2-piston rod, 3-digital depth gauge, 4-thermostat, 5-cylindrical solution cavity, 51-sealable inlet, 52-flange, 6-handle, 7-connection clip, 8-support frame. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] The present application utilizes the principle that the density of liquid is different at different temperatures, and the corresponding liquid volume is also different, and accurately measures the volume change of liquid by cooperating with the invented measurement device. The measurement method has an accuracy of 0.005 ml, the measurement result is accurate, the device structure is simple, and it is easy to implement. The specific implementation method is as follows:

[0033] As shown in Figure 1 , the liquid volume change measurement device provided by the embodiment of the present application includes a piston 1, a piston rod 2, a digital depth gauge 3, a thermostat 4, a cylindrical solution cavity 5, a handle 6, and a large-mouth upward conical support frame 8.

[0034] As shown in Figure 2As shown, the upper end of the solution cavity 5 is located outside the thermostat 4, and the lower end extends into the thermostat 4, and a sealable inlet 51 is arranged on the lower end face of the solution cavity 5. The sealable inlet 51 is a 37-degree ball head sealing port, so as to adapt to various interfaces of aerospace standards. The ball head is a DN2 ball head. In order to ensure coaxiality, a flange 52 structure is used to seal the upper end face of the solution cavity 5. The inner diameter of the solution cavity 5 is 25.24 mm, the wall thickness is 2 mm, the height is 255 mm, the maximum capacity is 100 mL, the inner cavity cross-sectional area is 500 mm2, and the material is 06Cr19Ni10, which belongs to stainless steel. The material has good corrosion resistance, and has good compatibility with various propellants and ignition agents of aerospace. The processing is also very convenient. The inside of the solution cavity 5 is provided with a 25 mL moving space, so as to prevent the piston 1 from being stuck in the solution cavity 5 due to no moving space, thereby causing the measurement to be impossible. At this time, the volume of the to-be-measured solution increases by 5 mL when the to-be-measured solution in the cavity rises by 10 mm, which is convenient for calculation. The center of the flange 52 is provided with a through hole; the piston 1 is installed in the solution cavity 5 and is in gap cooperation with the inner wall of the solution cavity 5; as shown Figure 3 As shown, the axial thickness of the piston 1 is 15 mm; two annular grooves 12 are arranged on the outer wall of the piston 1 around the circumference thereof; the planes where the two annular grooves are located are parallel to each other and perpendicular to the axis of the piston rod 2; one O-shaped sealing ring 11 is arranged in each annular groove; in order to ensure the convenience of measurement, the inner diameter of the solution cavity 5 is designed to be 25.24 mm according to calculation, and this size can just select the O-shaped sealing ring 11 with a model of 20.9X2.65A, and the material thereof is NBR. The two O-shaped sealing rings 11 can ensure the guiding property of the sliding of the piston 1, and also can ensure the sealing property of the solution cavity 5. A bolt hole is arranged at the center of the upper end of the piston 1 along the axial direction thereof, the lower end of the piston rod 2 extends into the solution cavity 5 through the through hole and is connected with the piston 1 through the bolt hole at the center of the upper end of the piston 1, and the upper end is detachably connected with the measuring end of the digital depth gauge 3 through the piston rod connector, so as to achieve firm and stable connection, and the distance between the outer wall of the piston rod 2 and the inner wall of the through hole is 0.5 mm. The length of the digital depth gauge 3 is 120 mm, and the accuracy is 0.01 mm.

[0035] The support frame 8 is sleeved at the connection position of the piston rod 2 and the digital depth gauge 3, the upper end of the support frame 8 is connected with the horizontal port of the digital depth gauge 3, and the lower end of the support frame 8 is connected with the upper end flange of the solution cavity 5; the handle 6 is located in the support frame 8 and is connected with the outer wall of the piston rod 2 through the connecting clamp 7, and the plane where the handle 6 is located is perpendicular to the axis of the piston rod 2. The support frame 8 is used to connect with external devices, fix the position of the solution cavity 5 in the thermostat 4, and in addition, the support frame 8 can also ensure that the digital depth gauge 3 is not damaged, and can also be used alone.

[0036] The digital depth gauge has the characteristics of 0 adjustable and accurate measurement. After the connection of the piston rod 2 and the digital depth gauge 3, according to the different densities of the liquid at different temperatures, the volume changes at different temperatures are shown, the pressure is generated with the liquid volume change to drive the piston 1, the piston rod 2, and finally the digital depth gauge 3, and accurate measurement is carried out.

[0037] The use method of the liquid volume change measuring device includes the following steps:

[0038] Step 1. Disassemble the digital depth gauge 3, and take out the solution cavity 5 from the thermostat 4. Draw the solution to be measured into the solution cavity 5 through the piston rod 2 and the piston 1, and invert the exhaust. After the digital depth gauge 3 is zeroed, the solution cavity 5 is sealed at the lower end by using a ball head.

[0039] Step 2. Connect the solution cavity 5 and the support frame 8 through the flange 52, connect the support frame 8 and the external device, put the solution cavity 5 into the thermostat 4, make the upper end of the solution cavity 5 located outside the thermostat 4, then coaxially connect the upper end of the piston rod 2 and the measuring end of the digital depth gauge 3 through the piston rod connector, and connect the upper end of the support frame 8 and the horizontal port of the digital depth gauge 3.

[0040] Step 3. Turn on the thermostat 4, and with the change of the temperature in the thermostat 4, the volume of the solution to be measured in the solution cavity 5 will increase or decrease, thereby driving the piston 1 and the piston rod 2 to move, so that the digital depth gauge 3 measures the volume change of the solution to be measured in the solution cavity.

[0041] The present application is especially suitable for the basic research of various space propulsion agents, ignition agents and other liquids, and the measurement of the volume change of other liquids, and the temperature range is-40℃ to 200℃. The accuracy can reach 0.05mL. The device has the characteristics of small volume, high accuracy, simple structure, easy implementation and low cost.

[0042] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A device for measuring a change in volume of a liquid, characterized by: It comprises a piston (1), a piston rod (2), a digital depth gauge (3), a thermostat (4), a cylindrical solution cavity (5) and a support frame (8); The upper end of the solution cavity (5) is located outside the thermostat (4), and the rest is located in the thermostat (4). A sealable inlet (51) is arranged on the lower end face of the solution cavity (5), and a flange (52) is arranged on the upper end face. A through hole is arranged in the center of the flange (52); The piston (1) is installed in the solution cavity (5) and cooperates with the inner wall of the solution cavity (5); The lower end of the piston rod (2) penetrates the through hole and extends into the solution cavity (5) to connect with the upper end center of the piston (1). The upper end of the piston rod (2) is coaxially and detachably connected with the measuring end of the digital depth gauge (3) through a piston rod connector. The support frame (8) is sleeved on the periphery of the connection between the piston rod (2) and the digital depth gauge (3). The upper end of the support frame (8) is connected with the horizontal port of the digital depth gauge (3), and the lower end is connected with the flange (52) of the upper end of the solution cavity (5). The support frame (8) is used to connect with external devices to fix the position of the solution cavity (5) in the thermostat (4).

2. The liquid volume change measuring device according to claim 1, wherein: The support frame (8) is a conical support frame, the large end of the conical support frame is connected with the horizontal port of the digital depth gauge (3), and the small end is provided with a connecting flange connected with the flange (52) of the upper end of the solution cavity (5).

3. The liquid volume change measuring device according to claim 2, wherein: The axial thickness of the piston (1) is 15mm; Two annular grooves (12) are arranged on the outer wall of the piston (1) around the circumference. The planes where the two annular grooves (12) are located are parallel to each other and perpendicular to the axis of the piston rod (2); An O-shaped sealing ring (11) is arranged in each annular groove.

4. The liquid volume change amount measuring apparatus according to claim 3, characterized by: The O-shaped sealing ring (11) is of type 20.9X2.65A, and the material is NBR.

5. The liquid volume change measuring device according to any one of claims 1-4, wherein: The length of the digital depth gauge (3) is 120mm, and the accuracy is 0.01mm.

6. The liquid volume change measuring device according to claim 5, wherein: The inner diameter of the solution cavity (5) is 25.24mm, the wall thickness is 2mm, the height is 255mm, the maximum capacity is 100mL, and the material is 06Cr19Ni10.

7. The liquid volume change amount measuring apparatus according to claim 6, wherein It further comprises a handle (6); The handle (6) is fixedly connected to the outer wall of the piston rod (2) through a connecting clamp (7), and the plane where the handle (6) is located is perpendicular to the axis of the piston rod (2); The handle (6) is located in the support frame (8).

8. The liquid volume change amount measuring apparatus according to claim 7, wherein The sealable inlet (51) is a ball head sealing port.

9. A method of measuring a liquid volume change amount using the liquid volume change amount measuring apparatus according to any one of claims 1 to 8, characterized by, It comprises the following steps: Step 1. Disassemble the digital depth gauge (3), and take out the solution cavity (5) from the thermostat (4). Draw the solution to be measured into the solution cavity (5) through the piston rod (2) and the piston (1), and invert to exhaust. After exhausting, seal the lower end of the solution cavity (5). Step 2. Connect the solution cavity (5) with the support frame (8) through the flange (52), connect the support frame (8) with external devices, put the solution cavity (5) into the thermostat (4), make the upper end of the solution cavity (5) outside the thermostat (4), coaxially connect the upper end of the piston rod (2) with the measuring end of the digital depth gauge (3) through the piston rod connector, and connect the upper end of the support frame (8) with the horizontal port of the digital depth gauge (3). Step 3. Turn on the thermostat (4), as the temperature in the thermostat (4) changes, the volume of the solution to be measured in the solution cavity (5) will increase or decrease accordingly, thereby driving the piston (1) and the piston rod (2) to move, so that the digital depth gauge (3) measures the volume change of the solution to be measured in the solution cavity.

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