Positive and negative pressure detection scale for laboratory

Abstract

The utility model discloses a positive and negative pressure detection scale for a laboratory, which belongs to the field of air pressure tests and comprises a positive and negative pressure test tank and a positive and negative pressure detection scale mechanism arranged in the positive and negative pressure test tank. Compared with the prior art, the positive and negative pressure testing tank has the advantages that the transparent scale pipe is installed in the tank body of the positive and negative pressure testing tank through the threaded sleeve, the deviation of positive and negative pressure intensity is determined through movement of the scale plug in the transparent scale pipe, and compared with a barometer installed in the tank body of the positive and negative pressure testing tank, the transparent scale pipe is of a thin pipeline structure, so that the measurement accuracy is improved. And data can be read more easily (the to-be-measured object is difficult to shield the display panel).

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gas pressure test, specifically point to a kind of positive and negative pressure detection scale for laboratory. BACKGROUND

[0002] In existing industrial production, in order to detect the sealing property and pressure resistance of processing object, positive and negative pressure tester is usually used in experimental stage to detect the sealing property of product;In the present stage of positive and negative pressure experiment, in order to ensure the accuracy of experimental data, usually when positive and negative pressure test, additional installation of a laboratory's positive and negative pressure detection device is used to check the gas pressure in tank, to avoid data error caused by air leakage when testing.

[0003] The existing laboratory's positive and negative pressure detection device is usually installed between the tank body of positive and negative pressure test tank and gas pressure pump, and the gas pressure is displayed by pressure gauge.

[0004] Although this display mode can effectively display the gas pressure when air is extracted or blown, there is still deviation for the actual data inside the tank body of positive and negative pressure test tank, if the pressure gauge is installed inside the tank body, although the corresponding data can be displayed, due to the structure problem of pressure gauge itself, larger space is used, and when the test object is larger, the measurement personnel is hindered to read data. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is that the existing laboratory's positive and negative pressure detection device usually adopts installation of pressure gauge outside positive and negative pressure test tank to detect deviation for the convenience of detecting data deviation, however, this detection mode cannot detect the actual data inside the tank body of positive and negative pressure test tank.

[0006] To solve the above technical problem, the technical scheme provided by the utility model is as follows: a positive and negative pressure detection scale for laboratory, comprising a positive and negative pressure test tank, a positive and negative pressure detection scale mechanism arranged inside the positive and negative pressure test tank, the positive and negative pressure detection scale mechanism comprising a transparent scale tube, a scale plug arranged inside the transparent scale tube and a sealing plug used for sealing a through hole on one side of the transparent scale tube, and a protective cover arranged on one side of the sealing plug and used for preventing the sealing plug from falling off.

[0007] As an improvement, a hollow stud is arranged in the tank of the positive and negative pressure test tank, and a plurality of air grooves are arranged on the side surface of the hollow stud.

[0008] As an improvement, the bottom surface of the cavity of the positive and negative pressure test tank and the bottom surface of the air groove are connected by laser welding.

[0009] As an improvement, the hollow stud is connected with the other end of the transparent scale tube by a threaded sleeve.

[0010] As an improvement, a sealing gasket for sealing is provided inside the threaded sleeve.

[0011] As an improvement, the hollow stud and the transparent scale tube are both connected to the threaded sleeve via a threaded structure.

[0012] The advantages of the present invention over the prior art are that the device installs a transparent scale tube inside the tank body of the positive and negative pressure test tank through a threaded sleeve, and determines the deviation of positive and negative pressure by moving the scale plug inside the transparent scale tube. Compared with the pressure gauge installed inside the tank body of the positive and negative pressure test tank, the transparent scale tube is a thin pipe structure, which makes it easier to read data (the object to be tested is unlikely to block the display panel). BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a structural diagram of a positive and negative pressure detection scale mechanism of a positive and negative pressure detection scale used in a laboratory.

[0014] Figure 2 The utility model is a structural diagram of a positive and negative pressure test tank of a positive and negative pressure detection scale used in a laboratory.

[0015] Figure 3 The utility model is an exploded diagram of a positive and negative pressure detection scale mechanism of a positive and negative pressure detection scale for a laboratory.

[0016] Figure 4 The utility model is a cross-sectional view of the overall structure of a positive and negative pressure detection scale for use in laboratories.

[0017] As shown in the figure: 1. Positive and negative pressure test tank; 2. Positive and negative pressure detection scale mechanism; 21. Transparent scale tube; 22. Scale plug; 23. Sealing plug; 24. Protective cover; 3. Threaded sleeve; 4. Sealing gasket. DETAILED DESCRIPTION

[0018] The present invention will be described in further detail below with reference to the accompanying drawings.

[0019] As the instruction manual Figure 2 、 4As shown, it includes a positive and negative pressure test tank 1, a hollow stud 11 is provided in the tank of the positive and negative pressure test tank 1, a positive and negative pressure detection scale mechanism 2 is provided inside the positive and negative pressure test tank 1, and a plurality of vent grooves 12 are provided on the side of the hollow stud 11. The bottom surface of the cavity of the positive and negative pressure test tank 1 and the bottom surface of the vent groove 12 are connected by laser welding. During the test, compressed air can enter the center hole of the hollow stud 11 through the vent groove 12 to ensure that the pressure inside the positive and negative pressure detection scale mechanism 2 is consistent with the positive and negative pressure test The pressure inside the tank 1 is consistent, and the bottom end of the vent groove 12 is welded to the inside of the positive and negative pressure test tank 1 using a laser, so that the two are combined into an integrated structure. This prevents the positive and negative pressure detection scale mechanism 2 from loosening due to the pressure difference during measurement without damaging the tank body of the positive and negative pressure test tank 1. (The positive and negative pressure test tank 1 is a single-opening structure with a sealed closing cover at the top, and the material of the positive and negative pressure test tank 1 is mostly transparent glass; one end of the closing cover of the positive and negative pressure test tank 1 is connected to an exhaust device using an air pressure pipe).

[0020] As the instruction manual Figure 1 、 3 As shown in Figure 4, the positive and negative pressure detection scale mechanism 2 includes a transparent scale tube 21, a scale plug 22 located inside the transparent scale tube 21, and a sealing plug 23 for sealing the through hole on one side of the transparent scale tube 21. A protective cover 24 is provided on one side of the sealing plug 23 to prevent the sealing plug 23 from falling off. The hollow stud 11 is connected to the other end of the transparent scale tube 21 through a threaded sleeve 3. A sealing gasket 4 is provided inside the threaded sleeve 3 for sealing. The hollow stud 11 and the transparent scale tube 21 are both connected to the threaded sleeve 3 through a threaded structure. The transparent scale tube 21 and the sealing plug 23 are both T-shaped structures, and the outer wall end of the transparent scale tube 21 is engraved with a corresponding air pressure scale. The scale plug 22 is inserted into the transparent scale tube 21. The thick column end of the scale tube 21 is inserted into the tank of the transparent scale tube 21, so that the scale line in the center of the scale plug 22 is aligned with the No. 0 scale line on the body of the transparent scale tube 21, and the sealing plug 23 is inserted into the through hole of the thin column end of the transparent scale tube 21, so that the sealing plug 23 and the scale plug 22 area form a fixed air pressure area, and the protective cover 24 is put on the bottom surface of the sealing plug 23, and the protective cover 24 is screwed on the thread of the transparent scale tube 21 that is sucked but on the outer wall for fixation; the threaded sleeve 3 is an H-shaped structure and has an air through hole inside. Sealing washers 4 are installed on the bottom surfaces on both sides of the center of the threaded sleeve 3, and then the screw holes at both ends of the threaded sleeve 3 are respectively screwed on the thread of the thick column end of the transparent scale tube 21 and the outer wall thread of the hollow stud 11 for fixation.

[0021] During the specific implementation of the present invention, the article to be tested is put into the positive and negative pressure test tank 1 from the tank opening, and the sealing cover is closed to seal it. The positive and negative pressure test tank 1 is evacuated (negative pressure) or inflated (positive pressure) using an air pressure pump. The pressure in the tank is recorded by observing the scale indicated by the indicator line of the scale plug 22, and finally compared with the data recorded by the air pressure pump to determine the pressure deviation.

[0022] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A positive and negative pressure detection scale for a laboratory, comprising a positive and negative pressure test tank (1), characterized in that: A positive and negative pressure detection scale mechanism (2) is provided inside the positive and negative pressure test tank (1), and the positive and negative pressure detection scale mechanism (2) comprises a transparent scale tube (21), a graduated plug (22) located inside the transparent scale tube (21), and a sealing plug (23) for sealing a through hole on one side of the transparent scale tube (21), wherein a protective cover (24) for preventing the sealing plug (23) from falling off is provided on one side of the sealing plug (23).

2. A positive and negative pressure detection scale for use in a laboratory according to claim 1, characterized in that: A hollow stud (11) is provided in the positive and negative pressure test tank (1), and a plurality of ventilation grooves (12) are provided on the side of the hollow stud (11).

3. A positive and negative pressure detection scale for use in a laboratory according to claim 2, characterized in that: The cavity bottom surface of the positive and negative pressure test tank (1) and the bottom surface of the vent groove (12) are connected by laser welding.

4. A positive and negative pressure detection scale for use in a laboratory according to claim 3, characterized in that: The hollow stud (11) is connected to the other end of the transparent scale tube (21) through a threaded sleeve (3).

5. A positive and negative pressure detection scale for use in a laboratory according to claim 4, characterized in that: A sealing gasket (4) for sealing is provided inside the threaded sleeve (3).

6. A positive and negative pressure detection scale for use in a laboratory according to claim 4, characterized in that: The hollow stud (11) and the transparent scale tube (21) are both connected to the threaded sleeve (3) via a threaded structure.

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