Gas density direct measuring device

Abstract

The invention relates to the technical field of gas density direct measurement, in particular to a gas density direct measurement device which comprises a test ventilation box body assembly, and one side of the test ventilation box body assembly is provided with a pressure measurement device, a temperature measurement device and a signal receiver from top to bottom; a vibration generating device is installed on the other side of the testing ventilation box body assembly, a signal processing device is installed on the other side of the testing ventilation box body assembly, and a display device is installed on the signal processing device. According to the application, gas can be quickly supplied into the test ventilation box body assembly through the vacuum pump, the vibration generation device can quickly vibrate, the vibration can be effectively transmitted through the gas in the test ventilation box body assembly, and meanwhile, measurement is performed through corresponding measurement parts; measurement of gas sealing is effectively achieved through data of sound waves, and real-time continuous measurement of gas density can be effectively achieved. And the device is suitable for various types of gases.

Description

Technical Field

[0001] The present invention relates to the technical field of direct measurement of gas density, and in particular to a device for direct measurement of gas density. Background Art

[0002] The traditional indirect method of measuring gas density requires measuring multiple physical quantities such as gas temperature and pressure, and the measurement of each physical quantity has a certain error. According to the error transmission theory, the measurement errors of multiple physical quantities will be transmitted to the calculation results of gas density, resulting in the amplification of the measurement error of gas density.

[0003] When indirectly measuring gas density, it is necessary to use the ideal gas state equation or other empirical formulas to substitute the measured physical quantity into the formula to calculate the gas density. These formulas are based on certain assumptions and approximations, and may have deviations for actual gases, introducing model errors. Especially under non-ideal conditions such as high pressure, high temperature or near critical state, the model error will be more significant.

[0004] Gas density is an important physical parameter of gas and is widely used in industrial production, environmental monitoring, scientific research and other fields. At present, the determination of gas density usually adopts the indirect measurement method, that is, by measuring the temperature, pressure and other parameters of the gas, and then calculating the gas density according to the ideal gas state equation or other empirical formulas.

[0005] This indirect measurement method has the following shortcomings: 1. The measurement process is complicated and requires the simultaneous measurement of multiple physical quantities, which increases the measurement error; 2. The calculation process depends on the state equation or empirical formula of the gas, which may introduce model errors; 3. It is difficult to achieve real-time continuous measurement of gas density. To this end, we proposed a direct gas density measurement device to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a gas density direct measurement device.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A gas density direct determination device comprises a test ventilation box assembly, wherein a pressure measuring device, a temperature measuring device and a signal receiver are installed on one side of the test ventilation box assembly from top to bottom; a vibration generating device is installed on the other side of the test ventilation box assembly, a signal processing device is installed on the other side of the test ventilation box assembly, a display device is installed on the signal processing device, a signal transmission device is commonly connected between the signal processing device and the pressure measuring device, the temperature measuring device and the signal receiver, a vacuum pump is installed on the lower end of the test ventilation box assembly, and the vacuum pump is connected to the test ventilation box assembly.

[0009] Compared with the prior art, the present application can quickly supply gas to the test ventilation box assembly through a vacuum pump, and can quickly make the vibration generating device vibrate, and can effectively transmit the vibration through the gas in the test ventilation box assembly. At the same time, it can measure through the corresponding measuring components to effectively realize the determination of gas sealing through the sound wave data, which can effectively realize real-time continuous measurement of gas density; and is suitable for various types of gases.

[0010] Preferably, the test ventilation box assembly comprises a box body, an opening is provided on the other side of the box body, a sealing movable plate is sealedly installed in the box body, a lifting mechanism is provided on one side of the sealing movable plate, a linkage plate and a top plate are provided on the lifting mechanism, a hydraulic cylinder assembly is rotatably connected to the top plate and the box body, and the hydraulic cylinder assembly is arranged through the opening;

[0011] The linkage plate is connected with a linkage mechanism, and the linkage mechanism is provided with two connecting valve pipes, and the two connecting valve pipes are both arranged through the box body, and the two connecting valve pipes are both arranged through the box body on a side away from the opening, and one of the connecting valve pipes is connected to the vacuum pump;

[0012] The pressure measuring device, the temperature measuring device and the signal receiver are installed on the box body.

[0013] Furthermore, by providing corresponding components in the box body, the sealing of the space formed in the box body can be effectively ensured, and the condition of the gas therein can be controlled as needed, that is, in actual production and preparation, the position of the sealing movable plate can be controlled, and when the sealing movable plate moves toward the direction of the connecting valve pipe fitting, the gas can be moved out of the box body, and when the sealing movable plate moves in a direction away from the connecting valve pipe fitting, the sealing of the space in the box body can be achieved, and at the same time, by moving the top plate, whether gas can flow in the connecting valve pipe fitting can be controlled, and when the sealing movable plate moves in the direction of the connecting valve pipe fitting, the connecting valve pipe fitting at the upper end can allow the gas to flow and discharge, and the connecting valve pipe fitting at the lower end can be closed and the gas can be discharged; when the sealing movable plate moves in a direction away from the connecting valve pipe fitting, the connecting valve pipe fitting at the upper end can be closed, and the connecting valve pipe fitting at the lower end can allow the gas to enter the box body.

[0014] Preferably, the lifting mechanism comprises a linkage groove provided on a side of the sealing movable plate close to the opening, a resistance mechanism is provided in the linkage groove, a synchronization plate is provided on the resistance mechanism, a positioning rod is fixed to the top and bottom of the linkage groove, and the synchronization plate and the top plate are respectively sleeved on the upper end and the lower end of the positioning rod;

[0015] A telescopic rod assembly is commonly fixed between the linkage plate and the synchronization plate, and the linkage plate is slidably installed in the opening.

[0016] Furthermore, the position of the top plate can be controlled by the extension and retraction of the hydraulic cylinder assembly, and the position of the linkage plate can be quickly controlled through the cooperation of the resistance mechanism so that the linkage mechanism can operate. At the same time, the action of the telescopic rod assembly can ensure that the sealing moving plate can control the operation of the linkage mechanism when it moves.

[0017] Preferably, a moving groove is provided on a side wall at one end of the opening, and one end of the linkage plate is located in the moving groove.

[0018] Furthermore, the stability of the operation of the linkage plate can be effectively guaranteed.

[0019] Preferably, the interference mechanism comprises an elastic reset component installed in the linkage groove, the elastic reset component is sleeved on a synchronization plate, and a limiting plate is fixed to one end of the synchronization plate located in the linkage groove and one end side wall of the linkage groove.

[0020] Furthermore, the setting of the limit plate can effectively limit the downward movement position of the synchronization plate under the action of the elastic reset component.

[0021] Preferably, the linkage mechanism includes a fixed plate fixed on one side of the linkage plate, the fixed plate is slidably installed on the rear end of the box body, a gear part is fixed on the valve stem in the connecting valve pipe fitting, and a spur rack is slidably installed on the two connecting valve pipe fittings. The spur rack is meshed with the two gear parts, and the spur rack is fixedly connected to the fixed plate.

[0022] Furthermore, by driving the fixed plate to rise and fall through the linkage plate, the fixed plate can drive the spur rack to rise and fall, and by the lifting and lowering of the spur rack, the gear part can drive the valve stem on the corresponding connecting valve pipe fitting to rotate, thereby controlling whether the connecting valve pipe fitting can allow gas to flow.

[0023] Preferably, one end of the pressure measuring device, the temperature measuring device and the signal receiver are all arranged through the box body, and one end of the pressure measuring device, the temperature measuring device and the signal receiver is arranged flush with one end side wall of the box body.

[0024] Furthermore, it can effectively ensure that the sealing movable plate and the side wall in the box body are in contact with each other, and the gas can be effectively squeezed out quickly.

[0025] The beneficial effects of the present invention are:

[0026] 1. This application adopts a direct measurement method, which only requires measuring one physical quantity, the speed of the sound wave. The error of the gas density measurement value obtained thereby mainly comes from the measurement error of this single physical quantity. Compared with the error accumulation of the indirect measurement method, the measurement error of this application is greatly reduced. In addition, the speed of the sound wave can be measured with high precision through mature frequency measurement technology, so that the measurement accuracy of this application can be further guaranteed.

[0027] 2. The measurement process of this application is simple, and there is no need to measure multiple physical quantities, which reduces measurement errors. At the same time, this application does not rely on the state equation or empirical formula of the gas, avoiding model errors. It is effectively different from traditional measurement methods and can achieve real-time continuous measurement of gas density. It is suitable for various types of gases and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A structural diagram of a gas density direct measurement device proposed by the present invention;

[0029] Figure 2 This is a structural diagram of a box body in a gas density direct measurement device proposed by the present invention;

[0030] Figure 3 The present invention is attached Figure 2 A magnified image of point A;

[0031] Figure 4 The present invention is attached Figure 2 A magnified view of point B;

[0032] In the figure: 1 display device, 2 signal processing device, 3 vibration generating device, 4 vacuum pump, 5 signal receiver, 6 temperature measuring device, 7 pressure measuring device, 8 signal transmission device, 9 test ventilation box body assembly, 91 box body, 92 sealing movable plate, 93 opening, 94 movable groove, 95 telescopic rod assembly, 96 linkage plate, 97 positioning rod, 98 linkage groove, 99 elastic reset assembly, 910 limit plate, 911 synchronization plate, 912 top plate member, 10 hydraulic cylinder assembly, 11 gear member, 12 connecting valve pipe fitting, 13 fixed plate, 14 spur rack. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] Reference Figure 1A gas density direct measurement device comprises a test ventilation box assembly 9, a sealed cavity can be formed in the test ventilation box assembly 9 for accommodating the gas to be measured, and a pressure measuring device 7, a temperature measuring device 6 and a signal receiver 5 are installed on one side of the test ventilation box assembly 9 from top to bottom; it is used to detect the propagation characteristics of sound waves in the measurement cavity, such as sound velocity measurement, air pressure measurement and temperature measurement, etc.; it can effectively measure the gas conditions in the sealed chamber in the test ventilation box assembly 9 and measure the sound transmission conditions; a vibration generating device 3 is installed on the other side of the test ventilation box assembly 9, and the vibration generating device 3 is used to generate sound waves in the sealed chamber in the test ventilation box assembly 9; at the same time, the pressure measuring device 7, the temperature measuring device 6 and the signal receiver 5 can effectively monitor the test ventilation box The sealed chamber in the test ventilation box assembly 9 is tested. A signal processing device 2 is installed on the other side of the test ventilation box assembly 9. A display device 1 is installed on the signal processing device 2. A signal transmission device 8 is commonly connected between the signal processing device 2 and the pressure measuring device 7, the temperature measuring device 6 and the signal receiver 5. A vacuum pump 4 is installed at the lower end of the test ventilation box assembly 9. The vacuum pump 4 is connected to the test ventilation box assembly 9 and can quickly transmit data signals through the signal transmission device 8. Data can be quickly transmitted to the signal processing device 2, so as to effectively process information through the signal processing device 2. At the same time, the components in the present application can be quickly controlled to enable them to operate; the relationship between the characteristics of sound waves or mechanical vibrations propagating in the gas and the gas density is utilized to realize the direct measurement of the gas density.

[0035] For the acoustic wave method, the relationship between the propagation velocity v of the acoustic wave in the gas and the gas density ρ is as follows: ρ = γP / v2;

[0036] γ is the ratio of the specific heat capacity at constant pressure to the specific heat capacity at constant volume of the gas, and P is the gas pressure.

[0037] Reference Figure 1-4 The test ventilation box assembly 9 includes a box body 91, an opening 93 is opened on the other side of the box body 91, a sealing movable plate 92 is sealed and installed in the box body 91, a lifting mechanism is provided on one side of the sealing movable plate 92, a linkage plate 96 and a top plate 912 are provided on the lifting mechanism, a hydraulic cylinder assembly 10 is rotatably connected to the top plate 912 and the box body 91, and the hydraulic cylinder assembly 10 is arranged in the opening 93;

[0038] The linkage plate 96 is connected to a linkage mechanism, and two connecting valve pipes 12 are arranged on the linkage mechanism. The two connecting valve pipes 12 are both arranged on the box body 91, and the two connecting valve pipes 12 are both arranged on the side of the box body 91 away from the opening 93, and one of the connecting valve pipes 12 is connected to the vacuum pump 4; by the corresponding components arranged in the box body 91, the sealing of the space formed in the box body 91 can be effectively guaranteed, and the gas situation therein can be controlled as needed, that is, in actual production and preparation, the position of the sealing movable plate 92 can be controlled, and when the sealing movable plate 92 moves toward the connecting valve pipe 12, the gas can be moved out of the box body 91, and when the sealing movable plate 92 moves in the direction away from the connecting valve pipe 12, the gas can be moved out of the box body 91. , which can realize the sealing of the space inside the box body 91. At the same time, through the movement of the top plate 912, it can control whether gas can flow in the connecting valve pipe fitting 12. When the sealing movable plate 92 moves toward the connecting valve pipe fitting 12, the connecting valve pipe fitting 12 at the upper end can allow the gas to flow out, and the connecting valve pipe fitting 12 at the lower end is closed, and the gas can be discharged; when the sealing movable plate 92 moves in the direction away from the connecting valve pipe fitting 12, the connecting valve pipe fitting 12 at the upper end can be closed, and the connecting valve pipe fitting 12 at the lower end can allow gas to enter the box body 91. One of the connecting valve pipe fittings 12 is connected to the vacuum pump 4, and the other connecting valve pipe fitting 12 is connected to the gas supply equipment that needs to measure the gas, so that gas extraction and transportation can be realized.

[0039] Reference Figure 1-4 The pressure measuring device 7, the temperature measuring device 6 and the signal receiver 5 are installed on the box body 91; one end of the pressure measuring device 7, the temperature measuring device 6 and the signal receiver 5 are all set through the box body 91, and one end of the pressure measuring device 7, the temperature measuring device 6 and the signal receiver 5 is flush with one end of the side wall inside the box body 91; it can effectively ensure that the sealing moving plate 92 and the side wall inside the box body 91 are in contact with each other, and the gas can be effectively squeezed out quickly.

[0040] Reference Figure 2-4 The lifting mechanism includes a linkage groove 98 opened on the side of the sealing movable plate 92 close to the opening 93, a resistance mechanism is arranged in the linkage groove 98, a synchronization plate 911 is arranged on the resistance mechanism, a positioning rod 97 is fixed to the top and bottom of the linkage groove 98, the synchronization plate 911 and the top plate 912 are respectively sleeved on the upper and lower ends of the positioning rod 97; a telescopic rod assembly 95 is fixed between the linkage plate 96 and the synchronization plate 911, and the linkage plate 96 is slidably installed in the opening 93; the position of the top plate 912 can be controlled by the extension and contraction of the hydraulic cylinder assembly 10, and the position of the linkage plate 96 can be quickly controlled by the cooperation of the resistance mechanism, so that the linkage mechanism can operate, and at the same time, the action of the telescopic rod assembly 95 can ensure that the sealing movable plate 92 can control the operation of the linkage mechanism when it moves.

[0041] Reference Figure 2-4 A moving groove 94 is provided on the side wall at one end of the opening 93, and one end of the linkage plate 96 is located in the moving groove 94; the stability of the operation of the linkage plate 96 can be effectively guaranteed.

[0042] Reference Figure 2-4 The resistance mechanism includes an elastic reset component 99 installed in the linkage groove 98, the elastic reset component 99 is sleeved on the synchronization plate 911, and a limiting plate 910 is fixed on one end of the synchronization plate 911 located in the linkage groove 98 and one end of the side wall in the linkage groove 98; the setting of the limiting plate 910 can effectively limit the downward position of the synchronization plate 911 under the action of the elastic reset component 99.

[0043] Reference Figure 2-4 The linkage mechanism includes a fixed plate 13 fixed on one side of the linkage plate 96, the fixed plate 13 is slidably installed at the rear end of the box body 91, a gear part 11 is fixed on the valve stem in the connecting valve pipe fitting 12, and a spur rack 14 is slidably installed on the two connecting valve pipe fittings 12, the spur rack 14 is meshed with the two gear parts 11, and the spur rack 14 is fixedly connected to the fixed plate 13; the fixed plate 13 is driven to rise and fall by the linkage plate 96, and the fixed plate 13 can drive the spur rack 14 to rise and fall, and the gear part 11 can drive the valve stem on the corresponding connecting valve pipe fitting 12 to rotate through the lifting of the spur rack 14, so as to control whether the connecting valve pipe fitting 12 can make the gas flow.

[0044] In the present invention, the pressure measuring device 7, the temperature measuring device 6 and the signal receiver 5 are used to detect the propagation characteristics of the sound waves in the measuring cavity, such as the sound velocity measurement, the air pressure measurement and the temperature measurement, etc.; the vibration generating device 3 is used to generate sound waves in the sealed chamber in the test ventilation box assembly 9; at the same time, the pressure measuring device 7, the temperature measuring device 6 and the signal receiver 5 can effectively monitor the condition of the sealed chamber in the test ventilation box assembly 9;

[0045] The data signal can be quickly transmitted through the signal transmission device 8, so that the data can be quickly transmitted to the signal processing device 2, so as to effectively process the information through the signal processing device 2. At the same time, the components in the present application can be quickly controlled to enable them to operate; the direct measurement of the gas density is achieved by utilizing the relationship between the characteristics of the propagation of sound waves or mechanical vibrations in the gas and the gas density.

[0046] For the acoustic wave method, the relationship between the propagation velocity v of the acoustic wave in the gas and the gas density ρ is as follows: ρ = γP / v2;

[0047] γ is the ratio of the specific heat capacity at constant pressure to the specific heat capacity at constant volume of the gas, and P is the gas pressure;

[0048] That is, during actual production and preparation, the length specification of the sealed chamber in the box body 91 is determined, and by monitoring the time of sound wave transmission and understanding the pressure conditions in the sealed chamber in the box body 91, calculations can be performed to understand the density of the gas in the sealed chamber in the box body 91.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gas density direct determination device, comprising a test ventilation box assembly (9), wherein a pressure measuring device (7), a temperature measuring device (6) and a signal receiver (5) are installed on one side of the test ventilation box assembly (9) from top to bottom; a vibration generating device (3) is installed on the other side of the test ventilation box assembly (9); a signal processing device (2) is installed on the other side of the test ventilation box assembly (9); a display device (1) is installed on the signal processing device (2); a signal transmission device (8) is commonly connected between the signal processing device (2) and the pressure measuring device (7), the temperature measuring device (6) and the signal receiver (5); a vacuum pump (4) is installed at the lower end of the test ventilation box assembly (9); and the vacuum pump (4) is connected to the test ventilation box assembly (9).

2. A gas density direct measurement device according to claim 1, characterized in that: The test ventilation box assembly (9) comprises a box body (91), the other side of the box body (91) is provided with an opening (93), a sealing movable plate (92) is sealedly installed in the box body (91), one side of the sealing movable plate (92) is provided with a lifting mechanism, a linkage plate (96) and a top plate (912) are provided on the lifting mechanism, a hydraulic cylinder assembly (10) is rotatably connected to the top plate (912) and the box body (91), and the hydraulic cylinder assembly (10) is arranged through the opening (93); The linkage plate (96) is connected to a linkage mechanism, and the linkage mechanism is provided with two connecting valve pipes (12), and the two connecting valve pipes (12) are both arranged through the box body (91), and the two connecting valve pipes (12) are both arranged through the box body (91) on a side away from the opening (93), and one of the connecting valve pipes (12) is connected to the vacuum pump (4); The pressure measuring device (7), the temperature measuring device (6) and the signal receiver (5) are installed on the box body (91).

3. A gas density direct measurement device according to claim 2, characterized in that: The lifting mechanism comprises a linkage groove (98) provided on a side of the sealing movable plate (92) close to the opening (93); a resistance mechanism is provided in the linkage groove (98); a synchronization plate (911) is provided on the resistance mechanism; a positioning rod (97) is fixed to the top and bottom of the linkage groove (98); the synchronization plate (911) and the top plate (912) are respectively sleeved on the upper end and the lower end of the positioning rod (97); A telescopic rod assembly (95) is fixed between the linkage plate (96) and the synchronization plate (911), and the linkage plate (96) is slidably installed in the opening (93).

4. A gas density direct measurement device according to claim 3, characterized in that: A moving groove (94) is provided on a side wall at one end of the opening (93), and one end of the linkage plate (96) is located in the moving groove (94).

5. A gas density direct measurement device according to claim 3, characterized in that: The interference mechanism comprises an elastic reset component (99) installed in the linkage groove (98), the elastic reset component (99) is sleeved on a synchronization plate (911), and the synchronization plate (911) is located at one end in the linkage groove (98) and a limit plate (910) is fixed on the side wall of one end in the linkage groove (98).

6. A gas density direct measurement device according to claim 2, characterized in that: The linkage mechanism comprises a fixed plate (13) fixed to one side of the linkage plate (96); the fixed plate (13) is slidably mounted on the rear end of the box body (91); a gear member (11) is fixed on the valve stem in the connecting valve pipe member (12); a spur rack (14) is slidably mounted on the two connecting valve pipe members (12); the spur rack (14) is meshed with the two gear members (11); and the spur rack (14) and the fixed plate (13) are fixedly connected.

7. A gas density direct measurement device according to claim 2, characterized in that: One end of the pressure measuring device (7), the temperature measuring device (6) and the signal receiver (5) are all arranged through the box body (91), and one end of the pressure measuring device (7), the temperature measuring device (6) and the signal receiver (5) is arranged flush with a side wall of one end of the box body (91).

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