Pressure gauge calibration equipment

Abstract

The utility model relates to the technical field of pressure gauge calibration, and discloses a pressure gauge calibration device which comprises an installation shell, an air bag fixedly installed in an inner cavity, a guide pipe fixedly installed at one end of the air bag and communicated with the inner cavity of the air bag, and one end, away from the air bag, of the guide pipe extends to the outside of the installation shell. A U-shaped tube is fixedly mounted at one end, away from the air bag, of the conduit, and a standard pressure gauge and a to-be-calibrated pressure gauge are detachably mounted at one end, away from the conduit, of the U-shaped tube. According to the utility model, through observing the relative position of the external scale line of the verification column and the tip of the marking needle, after the downward movement distance of the column to be verified is the same as the initial downward movement distance, the ball valve located right below the pressure gauge to be verified is closed, and whether the indicating value of the pressure gauge to be verified is the same as that of the standard pressure gauge is observed. And meanwhile, the amount of compressed air entering the pressure gauge to be calibrated can be judged only by observing the downward moving position of the calibration column, so that the cumbersome degree during calibration of the pressure gauge to be calibrated is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure gauge calibration technical field especially relates to a pressure gauge calibration equipment. BACKGROUND

[0002] Pressure gauge is to refer to the elastic element as the sensitive element, measures and indicates the instrument higher than ambient pressure, application is extremely common, it almost pervades all industrial processes and scientific research field, in the heat pipe network, oil and gas transmission, water supply and gas supply system, vehicle maintenance and repair factory and so on field everywhere can be seen, especially in industrial process control and technical measurement process, because the elastic sensitive element of mechanical pressure gauge has very high mechanical strength and the characteristics such as convenient production, make the mechanical pressure gauge get more and more extensive application, in the use of pressure gauge, need to calibrate pressure gauge periodically, avoid the error produced by long time use.

[0003] At present, before pressure gauge calibration, need to take down pressure gauge from the monitored equipment, then the pressure gauge that takes down is adjusted to zero and is connected with pressure gauge verifier, then fills the compressed air in pressure gauge through pressure gauge verifier, makes the pointer of pressure gauge gradually rotate to the specified calibration pressure point, and observes whether the indication of both is consistent, usually 3 to 5 calibration points are selected to calibrate in the calibration process, these points should cover the range of pressure gauge, for each calibration point, the indication of the pressure gauge under test needs to be recorded, and compared with the indication of the standard pressure gauge, to calculate the error.

[0004] The existing pressure gauge calibration device is mainly composed of a calibration table, a fine adjustment pump, a pre-pressing stop valve, a pressing pump and a gas storage tank, etc. Before calibrating the pressure gauge, the pressure gauge to be calibrated and the standard pressure gauge need to be installed on the calibration table, and then the pressing pump is repeatedly pressed to fill the compressed air in the gas storage tank. Then, the pre-pressing stop valve is opened to allow the compressed air in the gas storage tank to enter the standard pressure gauge. When the pointer of the standard pressure gauge rotates to the calibration point, the pre-pressing stop valve is closed, and then the fine adjustment pump is opened to allow the compressed air in the gas storage tank to enter the pressure gauge to be calibrated. The process is repeated until the indication of the pressure gauge to be calibrated is the same as that of the standard pressure gauge. In order to ensure the accuracy of the detection of the pressure gauge to be calibrated, the fine adjustment pump needs to be adjusted repeatedly by the staff, and the indication of the pressure gauge to be calibrated needs to be observed constantly to ensure that it is the same as that of the standard pressure gauge. Therefore, the calibration of the pressure gauge to be calibrated is complicated. UTILITY MODEL CONTENTS

[0005] In order to make up for the above shortcomings, the utility model provides a pressure gauge calibration equipment, which aims to solve the problems in the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: a pressure gauge calibration equipment, comprising:

[0007] The installation shell is internally provided with an air bag, one end of the air bag is fixedly provided with a catheter in communication with the inner cavity of the air bag, the catheter extends to the outside of the installation shell at the end away from the air bag, and the end of the catheter away from the air bag is fixedly provided with a U-shaped tube, the end of the U-shaped tube away from the catheter is detachably provided with a standard pressure gauge and a pressure gauge to be calibrated, respectively, and the inner cavity of the U-shaped tube is rotatably provided with two ball valves for controlling the flow rate of gas.

[0008] The installation shell is internally provided with an air bag, one end of the air bag is fixedly provided with a catheter in communication with the inner cavity of the air bag, the catheter extends to the outside of the installation shell at the end away from the air bag, and the end of the catheter away from the air bag is fixedly provided with a U-shaped tube, the end of the U-shaped tube away from the catheter is detachably provided with a standard pressure gauge and a pressure gauge to be calibrated, respectively, and the inner cavity of the U-shaped tube is rotatably provided with two ball valves for controlling the flow rate of gas.

[0009] As a further description of the above technical solutions:

[0010] The inner cavity of the installation shell is fixedly provided with a micro air pump at the bottom, the air inlet end of the micro air pump is fixedly provided with an air inlet pipe, and the air outlet end of the micro air pump is fixedly connected with one end of the air bag.

[0011] As a further description of the above technical solutions:

[0012] The outer wall of the installation shell is provided with a mounting hole in communication with the inner cavity, and the end of the air inlet pipe away from the micro air pump penetrates through the mounting hole and extends to the outside of the installation shell.

[0013] As a further description of the above technical solutions:

[0014] The bottom of the air bag is fixedly connected with the inner cavity of the installation shell, the inner cavity of the air bag is fixedly provided with a top pressure spring, the top of the top pressure spring is fixedly connected with the inner cavity of the air bag, and the top pressure spring is located directly below the calibration column.

[0015] As a further description of the above technical solutions:

[0016] The top pressure spring is provided in a cylindrical structure, and the large end of the top pressure spring is fixedly connected with the inner cavity of the air bag.

[0017] As a further description of the above technical solutions:

[0018] The top of the installation shell is fixedly provided with a marking needle, and the tip of the marking needle points to the plurality of scale lines.

[0019] The utility model has the advantages of:

[0020] The utility model discloses, through the observation check column outside scale line and the relative position of the marking needle tip, after the down distance of the check column is same with the initial down distance, close the ball valve located the pressure gauge of being checked just below, when the pressure gauge of being checked pointer stops rotating, the observation pressure gauge of being checked and the indication of standard pressure gauge whether same can, need not repeatedly adjust the ball valve, only need to observe the down position of check column can judge the compressed air amount of entering the pressure gauge of being checked, has reduced the degree of complexity when the pressure gauge of being checked calibrates. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the perspective drawing of the utility model;

[0022] Figure 2 It is the sectional view of the utility model installation shell;

[0023] Figure 3 It is the assembly drawing of the utility model ball valve and the pressure gauge of being checked;

[0024] Figure 4 It is the utility model Figure 1 The structure enlarged view of A place in the utility model.

[0025] Legend:

[0026] 1, installation shell, 2, check column, 3, marking needle, 4, standard pressure gauge, 5, pressure gauge of being checked, 6, U-shaped pipe, 7, ball valve, 8, guide pipe, 9, air inlet pipe, 10, air bag, 11, top pressure spring, 12, micro air pump. DETAILED DESCRIPTION

[0027] The technical scheme in the utility model embodiments will be described clearly and completely below in conjunction with the drawings in the utility model embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0028] Referring Figures 1-4 , the utility model provides an embodiment: a pressure gauge calibration equipment, comprising:

[0029] The installation shell 1 is fixedly installed with the air bag 10 in the inner chamber, the micro air pump 12 is fixedly installed at the inner chamber bottom of the installation shell 1, the air inlet pipe 9 is fixedly installed at the air inlet end of the micro air pump 12, and one end of the air bag 10 is fixedly connected with the air outlet end of the micro air pump 12. After starting the micro air pump 12, air enters the inside of the micro air pump 12 from the air inlet pipe 9 and enters the inside of the air bag 10 through the air outlet end, so that the air bag 10 is inflated, and the volume of the air bag 10 is increased.

[0030] One end of the air bag 10 is fixedly installed with a conduit 8 in communication with the inner cavity of the air bag 10, the conduit 8 extends to the outside of the installation shell 1 away from the air bag 10, and the conduit 8 is fixedly installed with a U-shaped tube 6 away from the air bag 10, and the compressed air in the air bag 10 flows into the inner cavity of the U-shaped tube 6 through the conduit 8.

[0031] The end of the U-shaped tube 6 away from the conduit 8 is respectively detachably installed with a standard pressure gauge 4 and a pressure gauge to be calibrated 5, and the inner cavity of the U-shaped tube 6 is rotatably installed with two ball valves 7 for controlling the flow rate of the gas, one of which is located directly below the standard pressure gauge 4, and the other is located directly below the pressure gauge to be calibrated 5.

[0032] Before calibrating the pressure gauge to be calibrated 5, the pressure gauge to be calibrated 5 is connected with one end of the U-shaped tube 6 by screwing, and then the two ball valves 7 are closed, so that the compressed air in the air bag 10 cannot enter the inside of the pressure gauge to be calibrated 5 and the standard pressure gauge 4, then the ball valve 7 directly below the standard pressure gauge 4 is opened, and then the micro air pump 12 is started, so that the outside air enters the inside of the air bag 10 through the micro air pump 12, at this time the air bag 10 is filled with compressed air to increase the volume.

[0033] The through hole is opened in the top of the installation shell 1, the top of the air bag 10 is fixedly installed with a calibration column 2, the top of the calibration column 2 penetrates the through hole and extends to the outside of the installation shell 1, the outer wall of the calibration column 2 is provided with a plurality of scale lines along the vertical direction, the top of the installation shell 1 is fixedly installed with a marking needle 3, the tip of the marking needle 3 points to the plurality of scale lines, when the volume of the air bag 10 increases, the top of the air bag 10 moves up, thereby pushing the calibration column 2 to move up along the through hole, until the middle of the scale line at the bottom of the calibration column 2 and the middle of the tip of the marking needle 3 are at the same horizontal line, the micro air pump 12 is closed, the compressed air into the inside of the air bag 10 is stopped, and the size of the air bag 10 can be determined by the distance through which the calibration column 2 moves up.

[0034] After the micro air pump 12 is closed, the ball valve 7 located directly below the standard pressure gauge 4 is opened, so that the compressed air inside the air bag 10 enters the inside of the U-shaped tube 6 through the conduit 8, and the compressed air inside the U-shaped tube 6 enters the inside of the standard pressure gauge 4 through one of the ball valves 7, at this time the volume of the air bag 10 is reduced, and the calibration column 2 is lowered, until the middle of one of the scale lines on the outer wall of the calibration column 2 is at the same horizontal line as the middle of the tip of the marker needle 3, and the downward distance of the calibration column 2 is recorded by the relative position between the scale line and the marker needle 3, then the ball valve 7 located directly below the standard pressure gauge 4 is closed, and when the pointer of the standard pressure gauge 4 stops rotating, the ball valve 7 located directly below the pressure gauge to be calibrated 5 is opened, at this time the compressed air inside the air bag 10 enters the inside of the pressure gauge to be calibrated 5 through the conduit 8 and the U-shaped tube 6, so that the pointer of the pressure gauge to be calibrated 5 rotates, and at the same time the relative position between the scale line outside the calibration column 2 and the tip of the marker needle 3 is observed, when the downward distance of the calibration column 2 is the same as the initial downward distance, the ball valve 7 located directly below the pressure gauge to be calibrated 5 is closed, and when the pointer of the pressure gauge to be calibrated 5 stops rotating, the values of the pressure gauge to be calibrated 5 and the standard pressure gauge 4 are observed to see if they are the same, without the need for repeated adjustment of the ball valve 7, and only by observing the downward position of the calibration column 2 can the amount of compressed air entering the inside of the pressure gauge to be calibrated 5 be determined, reducing the complexity of the calibration of the pressure gauge to be calibrated 5.

[0035] Two exhaust valves are fixedly installed on the outer wall of the U-shaped tube 6, and the two exhaust valves are located between the two ball valves 7 and the pressure gauge to be calibrated 5 and the standard pressure gauge 4, and after the calibration of the pressure gauge to be calibrated 5 is completed, the air inside the U-shaped tube 6 is exhausted through the two exhaust valves, until the values of the pressure gauge to be calibrated 5 and the standard pressure gauge 4 are zeroed.

[0036] The downward movement of the calibration column 2 is a cycle, and by repeatedly rotating the two ball valves 7, the compressed air inside the air bag 10 alternately enters the inside of the pressure gauge to be calibrated 5 and the standard pressure gauge 4, and the downward distance of the calibration column 2 in a cycle is ensured to be the same, so that multiple calibration points can be selected to calibrate the pressure gauge to be calibrated 5, and compared with the values of the standard pressure gauge 4 to calculate the error.

[0037] An installation hole communicating with the inner cavity of the installation shell 1 is formed in the outer wall of the installation shell 1, and the end of the air inlet pipe 9 away from the micro air pump 12 penetrates through the installation hole and extends to the outside of the installation shell 1, so that when the micro air pump 12 is started, external air can be sucked into the air inlet pipe 9 and transmitted to the inside of the air bag 10, and the stability of the air inlet pipe 9 is improved by fixing the air inlet pipe 9 through the installation hole.

[0038] The bottom of the air bag 10 is fixedly connected with the bottom of the inner cavity of the mounting shell 1, and the inner cavity bottom of the air bag 10 is fixedly provided with a top pressing spring 11, the top of the top pressing spring 11 is fixedly connected with the inner cavity top of the air bag 10, and the top pressing spring 11 is located directly below the calibration column 2, when the compressed air enters the air bag 10 and causes the top of the air bag 10 to move upward, the top of the top pressing spring 11 moves upward with the top of the air bag 10, when the compressed air in the air bag 10 is discharged, the top of the top pressing spring 11 moves downward with the top of the air bag 10, so that the calibration column 2 moves up and down under the push of the top of the top pressing spring 11 and the top of the air bag 10, the bottom of the calibration column 2 is supported by the top pressing spring 11, the shaking of the calibration column 2 when moving upward is prevented, and the stability of the calibration column 2 when moving upward and downward is improved.

[0039] The top pressing spring 11 is provided in a cylindrical structure, and the large end of the top pressing spring 11 is fixedly connected with the inner cavity bottom of the air bag 10, so that the downward moving distance of the top of the top pressing spring 11 is improved, and the selection of the number of calibration points of the calibration column 2 during downward movement is increased.

[0040] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A pressure gauge calibration apparatus, characterized by: The utility model relates to a kind of installation shell (1), air bag (10) is fixedly installed in inner cavity, one end of the air bag (10) is fixedly installed with and itself inner cavity communication conduit (8), the conduit (8) is extended to the outside of installation shell (1) away from the one end of air bag (10), and the conduit (8) is fixedly installed with U-shaped tube (6) away from the one end of air bag (10), the U-shaped tube (6) is respectively detachably installed with standard pressure gauge (4) and the pressure gauge (5) to be checked away from the one end of conduit (8), two ball valves (7) for controlling gas flow rate are rotatably installed in the inner cavity of U-shaped tube (6); Through-hole, opening is established in the top of installation shell (1), the top of air bag (10) is fixedly installed with calibration column (2), the top of calibration column (2) is through through-hole and extended to the outside of installation shell (1), and the outer wall of calibration column (2) is provided with multiple sets of scale along vertical direction. The inner cavity bottom of the installation shell (1) is fixedly installed with micro air pump (12), the air inlet end of the micro air pump (12) is fixedly installed with air inlet pipe (9), and the air outlet end of micro air pump (12) and one end of air bag (10) are fixedly connected.

2. A pressure gauge calibration apparatus according to claim 1, characterised in that: The outer wall of the installation shell (1) is provided with installation hole and itself inner cavity communication, the one end of air inlet pipe (9) is extended to the outside of installation shell (1) away from micro air pump (12) and penetrates installation hole.

3. A pressure gauge calibration apparatus according to claim 2, wherein: The bottom of the air bag (10) and the inner cavity bottom of installation shell (1) are fixedly connected, and the inner cavity bottom of air bag (10) is fixedly installed with top pressure spring (11), the top of top pressure spring (11) and the inner cavity top of air bag (10) are fixedly connected, and top pressure spring (11) is located just below calibration column (2).

4. A pressure gauge calibration apparatus according to claim 1, wherein: The top pressure spring (11) is provided as cylindrical structure, and the big end of top pressure spring (11) and the inner cavity bottom of air bag (10) are fixedly connected.

5. A pressure gauge calibration apparatus according to claim 4, wherein: The top of the installation shell (1) is fixedly installed with marking needle (3), and the tip of marking needle (3) points to multiple sets of scale.

6. A pressure gauge calibration apparatus according to claim 1, wherein: ​

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