Pressure vacuum meter calibration table

Abstract

The utility model discloses a pressure vacuum meter calibration bench, which comprises a base, a positive and negative pressure assembly and a cut-off assembly, when positive pressure is calibrated, a screw rod is rotated, a screw rod structure is utilized to push a screw block and a sealing plate upwards, a sealing groove is opened, at the moment, a precision pressure meter is communicated with a pressure vacuum meter to measure the positive pressure, and when negative pressure is calibrated, the cut-off assembly is cut off. The screw rod is rotated to drive the sealing plate to seal the sealing groove downwards, connection between the precision pressure gauge and the pressure vacuum gauge is cut off, negative pressure is verified through the pressure vacuum gauge, and whether a pointer of the pressure vacuum gauge points to the vacuum direction or not is observed. The calibration of one pressure vacuum meter can be completed without frequently assembling and disassembling the precise pressure meter and the precise vacuum meter, so that the working efficiency is greatly improved, and the labor intensity is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure vacuum gauges, in particular to a pressure vacuum gauge calibration table. Background Art

[0002] The pressure vacuum gauge is a pressure measuring instrument that can measure both pressure and vacuum. It is widely used in machinery, chemical, electric power, construction and other industries.

[0003] The range of the pressure vacuum gauge is composed of positive pressure and negative pressure. The positive and negative pressures need to be measured separately during calibration. Usually, to calibrate a pressure vacuum gauge, it is necessary to install and unload the precision pressure gauge and the precision vacuum gauge respectively to complete the measurement. Such frequent and repeated operations are cumbersome and seriously affect work efficiency. At the same time, it may also cause reverse impact on the standard instrument due to misoperation. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above problems and / or the problems existing in the existing pressure vacuum gauge calibration table, the present utility model is proposed.

[0006] Therefore, the purpose of the utility model is to provide a pressure vacuum gauge calibration table. When calibrating the negative pressure, the screw is rotated to drive the sealing plate downward to close the sealing groove, and the connection between the precision pressure gauge and the pressure vacuum gauge is cut off. The negative pressure is calibrated using the pressure vacuum gauge, and it is observed whether the pointer of the pressure vacuum gauge points to the vacuum direction. The calibration of a pressure vacuum gauge can be completed without the need for frequent loading and unloading of the precision pressure gauge and the precision vacuum gauge, which greatly improves work efficiency and reduces labor intensity.

[0007] In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0008] A pressure vacuum gauge calibration platform, comprising:

[0009] A base, wherein a test air pipe is provided on a side wall of the base, a first branch pipe is provided on the top of the base near the left side, a second branch pipe is provided on the top of the base near the right side, the first branch pipe and the second branch pipe are both connected to the test air pipe, a pressure vacuum gauge is connected to the top of the second branch pipe, a precision pressure gauge is connected to the top of the first branch pipe, a third branch pipe is provided on the top of the base, the third branch pipe is located between the first branch pipe and the second branch pipe and is connected to the test air pipe, and a sealing groove is provided at the connection between the bottom of the third branch pipe and the test air pipe;

[0010] A positive and negative pressure assembly is installed on the side wall of the base and is used to pressurize or depressurize the inside of the test air pipe; a cut-off assembly includes a fixing frame installed on the top of the base, a second knob rotatably connected to the top of the fixing frame, and a sealing plate located inside the sealing groove, a screw rod is installed at the bottom of the second knob, the screw rod extends into the sealing groove, a wire block is installed on the top of the sealing plate, and the wire block is connected to the screw rod.

[0011] As a preferred solution of a pressure vacuum gauge calibration bench described in the utility model, the positive and negative pressure components include a shell installed on the side wall of the base, a pressure rod hinged on the top of the shell and a piston located inside the shell, a second air pipe is opened inside the shell, a through hole is opened on the side wall of the shell, the through hole is connected to the second air pipe, a steel wire is installed on the front section of the pressure rod, the other end of the steel wire is connected to the piston, and a spring is installed on the side wall of the piston.

[0012] As a preferred solution of a pressure vacuum gauge calibration bench described in the utility model, a third air pipe is slidably connected to the inside of the second air pipe, a first air inlet is provided at the front end of the side wall of the third air pipe, a first inward wing plate is hingedly provided inside the first air inlet, a first air outlet is provided at the front end of the other side wall of the third air pipe, a first outward wing plate is hingedly provided inside the first air outlet, a second air outlet is provided at the tail end of the side wall of the third air pipe, a second outward wing plate is hingedly provided inside the second air outlet, a second air inlet is provided at the tail end of the other side wall of the third air pipe, and a second inward wing plate is hingedly provided inside the second air inlet.

[0013] As a preferred solution of the pressure vacuum gauge calibration bench described in the utility model, when the first air inlet is connected to the test air pipe, the first air outlet is connected to the through hole, and when the second air outlet is connected to the test air pipe, the second air inlet is connected to the through hole.

[0014] As a preferred solution of a pressure vacuum gauge calibration bench described in the utility model, the side wall of the shell is rotatably connected to a first knob, the inner wall of the second air pipe is rotatably connected to a first bevel gear, the first bevel gear is coaxially and fixedly connected to the first knob, the inside of the second air pipe is rotatably connected to a reciprocating screw, a second bevel gear is installed on the side end of the reciprocating screw, the second bevel gear is meshed with the first bevel gear, and a reciprocating wire block is installed on the tail end of the third air pipe, and the reciprocating wire block is connected to the reciprocating screw.

[0015] As a preferred solution of the pressure vacuum gauge calibration bench described in the utility model, it also includes a limit assembly, which includes a fixed frame installed on the top of the fixed frame, a slider slidably connected to the inside of the fixed frame, and a second spring installed on the side wall of the slider, and the other side wall of the slider is provided with a limit groove that cooperates with the second knob.

[0016] Compared with the prior art: a precision pressure gauge and a pressure vacuum gauge are respectively connected to the top of the base, and both the precision pressure gauge and the pressure vacuum gauge are connected to the test air pipe. A sealing groove is opened in the test air pipe at the middle position of the precision pressure gauge and the pressure vacuum gauge, and a sealing plate is slid inside the sealing groove, and a wire block is provided on the top of the sealing plate. A fixed plate is arranged on the top of the base, and a knob and a screw rod are arranged on the fixed plate. The screw rod is connected to the wire block. When calibrating the positive pressure, the screw rod is rotated to use the screw rod structure to push the wire block and the sealing plate upward, and the sealing groove is opened. At this time, the precision pressure gauge and the pressure vacuum gauge are connected to measure the positive pressure. When calibrating the negative pressure, the screw rod is rotated to drive the sealing plate downward to close the sealing groove, and the connection between the precision pressure gauge and the pressure vacuum gauge is cut off. The negative pressure is calibrated using the pressure vacuum gauge to observe whether the pointer of the pressure vacuum gauge points to the vacuum direction. The calibration of a pressure vacuum gauge can be completed without frequently loading and unloading the precision pressure gauge and the precision vacuum gauge, thereby simplifying the operation and greatly improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the implementation of the utility model, the utility model will be described in detail below in combination with the drawings and detailed implementation. Obviously, the drawings described below are only some implementations of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0018] Figure 1 This is the overall structure diagram of a pressure vacuum gauge calibration platform of the utility model;

[0019] Figure 2 This is a cross-sectional structural diagram of a base of a pressure vacuum gauge calibration table of the utility model;

[0020] Figure 3 This is a structural diagram of the positive and negative pressure components of a pressure vacuum gauge calibration station of the utility model;

[0021] Figure 4 This is a structural diagram of the side wall of the shell of a pressure vacuum gauge calibration platform of the utility model;

[0022] Figure 5 This is a cross-sectional structural diagram of a floating tube of a pressure vacuum gauge calibration platform of the utility model;

[0023] Figure 6 The utility model is a structural diagram of a limit assembly of a pressure vacuum gauge calibration platform. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0025] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0026] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] The utility model provides a pressure vacuum gauge calibration table. When calibrating negative pressure, the screw rod is rotated to drive the sealing plate downward to close the sealing groove, and the connection between the precision pressure gauge and the pressure vacuum gauge is cut off. The negative pressure is calibrated by using the pressure vacuum gauge, and it is observed whether the pointer of the pressure vacuum gauge points to the vacuum direction. The calibration of a pressure vacuum gauge can be completed without frequently loading and unloading the precision pressure gauge and the precision vacuum gauge, which greatly improves the work efficiency and reduces the labor intensity.

[0028] Figure 1-6 The following is a schematic diagram of a pressure and vacuum gauge calibration table according to the present invention. Figure 1-Figure 6 A pressure vacuum gauge calibration platform of the present embodiment includes a base 100, a positive and negative pressure assembly 200, a cut-off assembly 300 and a limit assembly 400.

[0029] A test air pipe 110 is opened on the side wall of the base 100, a first branch pipe 120 is opened on the top of the base 100 near the left side, a second branch pipe 130 is opened on the top of the base 100 near the right side, the first branch pipe 120 and the second branch pipe 130 are both connected to the test air pipe 110, a pressure vacuum gauge 140 is connected to the top of the second branch pipe 130, a precision pressure gauge 140a is connected to the top of the first branch pipe 120, a third branch pipe 150 is opened on the top of the base 100, the third branch pipe 150 is located between the first branch pipe 120 and the second branch pipe 130 and is connected to the test air pipe 110, and a sealing groove 150a is opened at the connection between the bottom of the third branch pipe 150 and the test air pipe 110.

[0030] The positive and negative pressure assembly 200 is installed on the side wall of the base 100, and is used to pressurize and reduce the pressure inside the test air pipe 110. The positive and negative pressure assembly 200 includes a shell 210 installed on the side wall of the base 100, a pressure rod 220 hinged on the top of the shell 210, and a piston 230 located inside the shell 210. A second air pipe 210a is opened inside the shell 210, and a through hole 210a-1 is opened on the side wall of the shell 210. The through hole 210a-1 is connected to the second air pipe 210a. A steel wire 220a is installed at the front end of the pressure rod 220, and the other end of the steel wire 220a is connected to the piston 230. A spring 230a is installed on the side wall of the piston 230. The second air pipe 210a is slidably connected to the third air pipe 240, and the front end of the side wall of the third air pipe 240 is opened. A first air inlet 240a is provided, and a first inward wing plate 240a-1 is hingedly connected inside the first air inlet 240a. A first air outlet 240b is provided at the front end of the other side wall of the third air pipe 240, and a first outward wing plate 240b-1 is hingedly connected inside the first air outlet 240b. A second air outlet 240c is provided at the tail end of the side wall of the third air pipe 240, and a second outward wing plate 240c-1 is hingedly connected inside the second air outlet 240c. A second air inlet 240d is provided at the tail end of the other side wall of the third air pipe 240, and a second inward wing plate 240d-1 is hingedly connected inside the second air inlet 240d. When the first air inlet 240a is connected to the test air pipe 110, the first air outlet 240b is connected to the through hole 210. a-1 is connected, when the second air outlet 240c is connected to the test air pipe 110, the second air inlet 240d is connected to the through hole 210a-1, the side wall of the shell 210 is rotatably connected to the first knob 210b, the inner wall of the second air pipe 210a is rotatably connected to the first bevel gear 210b-1, the first bevel gear 210b-1 is coaxially fixedly connected to the first knob 210b, the inside of the second air pipe 210a is rotatably connected to the reciprocating screw rod 210c, the side end of the reciprocating screw rod 210c is installed with a second bevel gear 210c-1, the second bevel gear 210c-1 is meshed with the first bevel gear 210b-1, the tail end of the third air pipe 240 is installed with a reciprocating wire block 260, the reciprocating wire block 260 is connected to the reciprocating screw rod 210c, when it is necessary to enter When performing positive pressure detection, the rotating shell 210 drives the first bevel gear 210b-1 to rotate, and the first bevel gear 210b-1 drives the second bevel gear 210c-1 and the reciprocating screw 210c to rotate. When the reciprocating screw 210c rotates, the screw structure is used to push the third air pipe 240 to move toward the piston 230 until the second air outlet 240c is connected with the test air pipe 110, and the second air inlet 240d is connected with the through hole 210a-1. At this time, the pressing rod 220 is pressed to flip downward, and the pressing rod 220 pulls the steel wire 220a upward. The steel wire 220a pulls the piston 230 to slide toward the front end of the shell 210 and squeezes the spring 230a. At this time, the second inward wing plate 240d-1 flips open, and the second outward wing plate 240c-1 is closed.The air enters the third air pipe 240 and the second air pipe 210a through the through hole 210a-1 and the second air inlet 240d. As the pressure rod 220 is released, the spring 230a rebounds and pushes the piston 230 to move toward the rear end of the shell 210. The piston 230 pulls the steel wire 220a to drive the pressure rod 220 to flip upward and reset. At this time, the second outward wing plate 240c-1 is opened, the piston 230d-1 is closed, and the air inside the third air pipe 240 enters the test air pipe through the second air outlet 240c. 110a, and are respectively transported to the first branch pipe 120 and the second branch pipe 130 through the test air pipe 110a, and then transported to the precision pressure gauge 140a and the pressure vacuum gauge 140 for positive pressure measurement. When it is necessary to continue the vacuum and negative pressure test, the rotating shell 210 drives the first bevel gear 210b-1 to reverse, and the first bevel gear 210b-1 drives the second bevel gear 210c-1 and the reciprocating screw 210c to reverse. When the reciprocating screw 210c rotates, the screw structure is used to push The third air pipe 240 moves away from the piston 230 until the first air inlet 240a is connected to the test air pipe 110 and the first air outlet 240b is connected to the through hole 210a-1. At this time, the pressing rod 220 is turned downward, and the pressing rod 220 pulls the steel wire 220a upward. The steel wire 220a pulls the piston 230 to slide toward the front end of the shell 210 and squeezes the spring 230a. At this time, the first inward wing plate 240a-1 is turned open, the first outward wing plate 240b-1 is closed, and the second The air inside the branch pipe 130 and the test air pipe 110 enters the third air pipe 240 through the first air inlet 240a. As the pressure rod 220 is released, the spring 230a rebounds and pushes the piston 230 to move toward the rear end of the housing 210. The piston 230 pulls the steel wire 220a to drive the pressure rod 220 to flip upward and reset. At this time, the first outward wing plate 240b-1 opens, the spring 230a-1 closes, and the air inside the third air pipe 240 is discharged through the first air outlet 240b to perform negative pressure measurement.

[0031] The cut-off assembly 300 includes a fixing frame 310 mounted on the top of the base 100, a second knob 320 rotatably connected to the top of the fixing frame 310, and a sealing plate 330 located inside the sealing groove 150a. A screw rod 320a is mounted at the bottom of the second knob 320, and the screw rod 320a extends into the sealing groove 150a. A wire block 330a is mounted on the top of the sealing plate 330, and the wire block 330a is connected to the screw rod 320a. When a positive pressure measurement is performed, the screw rod 320a is driven to rotate by rotating the second knob 320, so as to facilitate the measurement of the positive pressure. The screw structure is used to push the wire block 330a and the sealing plate 330 upward, at which time the sealing groove 150a is opened, and the sealing groove 150a is connected to the test air pipe 110, thereby connecting the first branch pipe 120 and the second branch pipe 130. When negative pressure vacuum measurement is required, the second knob 320 is rotated to drive the screw 320a to reverse, and the screw structure is used to push the wire block 330a and the sealing plate 330 downward, so as to close the sealing groove 150a and cut off the connection between the first branch pipe 120 and the second branch pipe 130.

[0032] The limiting assembly 400 includes a fixed frame 410 installed on the top of the fixed frame 310, a slider 420 slidably connected to the inside of the fixed frame 410, and a second spring 430 installed on the side wall of the slider 420. The other side wall of the slider 420 is provided with a limiting groove 420a that cooperates with the second knob 320. The outer wall of the second knob 320 is provided with a circle of densely packed teeth, and the inner wall of the limiting groove 420a is provided with densely packed teeth that cooperate with the teeth. By pulling the slider 420 to the inside of the fixed frame 410, the slider 420 is moved to the inside of the fixed frame 410. Move and squeeze the second spring 430, and the second knob 320 is separated from the inside of the limiting groove 420a. At this time, the second knob 320 is rotated to adjust the position of the sealing plate 330. After the adjustment, the slider 420 is released, and the second spring 430 rebounds and pushes the slider 420 to move toward the second knob 320 until the second knob 320 is embedded in the limiting groove 420a. The outer wall teeth of the second knob 320 and the inner wall teeth of the limiting groove 420a engage with each other to limit the second knob 320.

[0033] Combination Figure 1-Figure 6In the present embodiment, a pressure vacuum gauge calibration table is used. When performing positive pressure measurement, the second knob 320 is rotated to drive the sealing plate 330 to move upward, open the sealing groove 150a, and connect the first branch pipe 120 with the second branch pipe 130. The first knob 210b is rotated to drive the reciprocating screw rod 210c to rotate, and the third air pipe 240 is pushed forward to connect the second air outlet 240c with the test air pipe 110, and the second air inlet 240d is connected with the through hole 210a-1. At this time, pressing the pressure rod 220 drives the piston 230 to move forward and backward, and sends air into the inside of the test air pipe 110, and respectively delivers it to the inside of the first branch pipe 120 and the second branch pipe 130. The positive pressure calibration is performed using the precision pressure gauge 140a and the pressure vacuum gauge 140. When the negative pressure calibration is required, according to JJG52-2013 "Elastic Elements The calibration procedure for "General Pressure Gauges, Pressure Vacuum Gauges and Vacuum Gauges" stipulates that the indication error calibration of the vacuum part of the pressure vacuum gauge: the upper limit of pressure measurement is 0.3~2.4Mpa, and the pointer should be able to point to the vacuum direction when evacuated. Therefore, when performing negative pressure calibration, rotate the second knob 320 to drive the sealing plate 330 to move downward to close the sealing groove 150a, cut off the connection between the first branch pipe 120 and the second branch pipe 130, and rotate the first knob 210b to drive the reciprocating screw 210c to rotate and push the third air pipe 240 to move backward. The first air inlet 240a is connected to the test air pipe 110, and the first air outlet 240b is connected to the through hole 210a-1. At this time, press the pressure rod 220 to extract the air inside the second branch pipe 130 and the test air pipe 110, and observe whether the pointer of the pressure vacuum gauge 140 points to the vacuum direction.

[0034] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pressure vacuum gauge calibration station, characterized in that: include: A base (100), wherein a test air pipe (110) is provided on a side wall of the base (100), a first branch pipe (120) is provided on the top of the base (100) near the left side, a second branch pipe (130) is provided on the top of the base (100) near the right side, the first branch pipe (120) and the second branch pipe (130) are both connected to the test air pipe (110), a pressure vacuum gauge (140) is connected to the top of the second branch pipe (130), a precision pressure gauge (140a) is connected to the top of the first branch pipe (120), a third branch pipe (150) is provided on the top of the base (100), the third branch pipe (150) is located between the first branch pipe (120) and the second branch pipe (130) and is connected to the test air pipe (110), and a sealing groove (150a) is provided at the bottom of the third branch pipe (150) at the connection with the test air pipe (110); A positive and negative pressure assembly (200) is installed on the side wall of the base (100) and is used to increase or decrease the pressure inside the test air pipe (110); The cut-off assembly (300) comprises a fixing frame (310) mounted on the top of the base (100), a second knob (320) rotatably connected to the top of the fixing frame (310), and a sealing plate (330) located inside the sealing groove (150a), wherein a screw rod (320a) is mounted at the bottom of the second knob (320), and the screw rod (320a) extends into the sealing groove (150a), and a wire block (330a) is mounted on the top of the sealing plate (330), and the wire block (330a) is connected to the screw rod (320a).

2. A pressure vacuum gauge calibration bench according to claim 1, characterized in that: The positive and negative pressure assembly (200) comprises a shell (210) mounted on the side wall of the base (100), a pressure rod (220) hinged on the top of the shell (210), and a piston (230) located inside the shell (210); a second air pipe (210a) is provided inside the shell (210); a through hole (210a-1) is provided on the side wall of the shell (210); the through hole (210a-1) is connected to the second air pipe (210a); a steel wire (220a) is installed at the front end of the pressure rod (220); the other end of the steel wire (220a) is connected to the piston (230); and a spring (230a) is installed on the side wall of the piston (230).

3. A pressure vacuum gauge calibration platform according to claim 2, characterized in that: The second air pipe (210a) is slidably connected to a third air pipe (240) inside, a first air inlet (240a) is provided at the front end of the side wall of the third air pipe (240), a first inward wing plate (240a-1) is hingedly connected inside the first air inlet (240a), a first air outlet (240b) is provided at the front end of the other side wall of the third air pipe (240), a first outward wing plate (240b-1) is hingedly connected inside the first air outlet (240b), a second air outlet (240c) is provided at the tail end of the side wall of the third air pipe (240), a second outward wing plate (240c-1) is hingedly connected inside the second air outlet (240c), a second air inlet (240d) is provided at the tail end of the other side wall of the third air pipe (240), a second inward wing plate (240d-1) is hingedly connected inside the second air inlet (240d).

4. A pressure vacuum gauge calibration platform according to claim 3, characterized in that: When the first air inlet (240a) is connected to the test air pipe (110), the first air outlet (240b) is connected to the through hole (210a-1); when the second air outlet (240c) is connected to the test air pipe (110), the second air inlet (240d) is connected to the through hole (210a-1).

5. The pressure vacuum gauge calibration platform according to claim 3, characterized in that: The side wall of the housing (210) is rotatably connected to a first knob (210b); the inner wall of the second air pipe (210a) is rotatably connected to a first bevel gear (210b-1); the first bevel gear (210b-1) is coaxially fixedly connected to the first knob (210b); the interior of the second air pipe (210a) is rotatably connected to a reciprocating screw rod (210c); a second bevel gear (210c-1) is mounted on the side end of the reciprocating screw rod (210c); the second bevel gear (210c-1) is meshed with the first bevel gear (210b-1); a reciprocating wire block (260) is mounted on the rear end of the third air pipe (240); the reciprocating wire block (260) is connected to the reciprocating screw rod (210c).

6. The pressure vacuum gauge calibration platform according to claim 1, characterized in that: The invention also includes a limit assembly (400), wherein the limit assembly (400) includes a fixed frame (410) installed on the top of the fixed frame (310), a slider (420) slidably connected to the inside of the fixed frame (410), and a second spring (430) installed on the side wall of the slider (420), and the other side wall of the slider (420) is provided with a limit groove (420a) that cooperates with the second knob (320).

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