Screw hole pressure testing device

Abstract

The utility model discloses a screw hole pressure test device, which comprises a mandrel, a pressing ring sleeved in the middle of the mandrel and a nut sleeved on the upper portion of the mandrel, the lower portion of the mandrel is in threaded connection in a local threaded hole to be subjected to pressure test of an air cylinder, and the pressing ring is sleeved outside the middle of the mandrel in a sealing mode. Surface sealing is formed between the pressing ring and the top face where a local threaded hole to be subjected to pressure testing of the air cylinder is located, the upper portion of the core shaft is sleeved with a nut so that the pressing ring can abut against the local surface of the air cylinder, a vertically-through core shaft through hole is formed in the center of the core shaft, and an upper end threaded hole is formed in the top of the core shaft and is in threaded connection with a pressurizing connector. And the pressurizing joint is connected with a pressurizing device so as to fill a detection object into the threaded hole to be subjected to pressure test through the mandrel through hole. According to the utility model, the problem that pressure-bearing equipment such as a cylinder lacks efficient and rapid hydraulic test and air tightness test tools can be solved, and defects such as micro cracks on the periphery of a screw hole can be checked when the device is used for hydraulic test and air tightness test.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment, and more specifically, to a screw hole pressure testing device. Background Art

[0002] The screw holes on the cylinder of a reciprocating compressor and their surroundings may have defects that are difficult to find. These defects can be monitored and checked through hydraulic tests and air tightness tests to monitor the leakage points. At present, there is a lack of efficient and convenient hydraulic test and air tightness test tools for the screw holes of cylinders or other pressure-bearing equipment to detect whether there are leaks near the cylinder threaded holes and eliminate defects such as micro cracks that are difficult to find. In order to conduct screw hole hydraulic tests and air tightness tests conveniently and quickly, this application designs a screw hole pressure test device. Utility Model Content

[0003] One purpose of the utility model is to provide a screw hole pressure testing device, which can solve the problem that pressure-bearing equipment such as cylinders lack efficient and fast hydraulic testing and air tightness testing tools. By performing hydraulic testing and air tightness testing with the device of the present application, defects such as microcracks around the screw holes can be detected.

[0004] In order to solve the above technical problems, the utility model provides a screw hole pressure testing device, including a core shaft, a pressure ring sleeved on the middle part of the core shaft and a nut sleeved on the upper part of the core shaft, the lower part of the core shaft is threadedly connected to the local threaded hole to be pressure tested in the cylinder, the pressure ring sealing sleeve is arranged outside the middle part of the core shaft, and a surface seal is formed between the pressure ring and the top surface of the local threaded hole to be pressure tested in the cylinder. The upper part of the core shaft is sleeved with a nut to press the pressure ring tightly against the local surface of the cylinder, a vertically penetrating core shaft through hole is provided in the center of the core shaft, and an upper threaded hole is provided on the top of the core shaft, which is threadedly connected to a pressure charging joint, and the pressure charging joint is connected to a pressure charging device to charge the detection object into the threaded hole to be pressure tested through the core shaft through hole.

[0005] Preferably, the bottom surface of the pressure ring is provided with a concave groove, in which an O-ring is placed to seal the pressure ring and a local surface of the cylinder.

[0006] Preferably, a transition fit is formed between the mating surface of the pressure ring and the mating surface of the core shaft where the pressure ring contacts the core shaft.

[0007] Preferably, a pair of upper end clamping surfaces are arranged opposite to each other at the upper end of the core shaft.

[0008] Preferably, a pair of clamping surfaces on both sides of the pressing ring are arranged opposite to each other on the outer periphery of the pressing ring.

[0009] Preferably, the middle portion of the core shaft located in the pressure ring is formed into a step-shaped structure, and the outer diameter of the lower portion is larger than the outer diameter of the upper portion.

[0010] The utility model at least has the following beneficial effects:

[0011] The device of the utility model can be used for hydraulic pressure test and air tightness test of screw holes of pressure-bearing equipment such as cylinders. The screw hole is formed into a closed space through a pressure ring and an O-ring, and gas or liquid can be filled into it through the through hole of the core shaft, so as to detect whether there are leakage points in the screw hole and its surrounding areas, and then detect micro cracks and other defects that are not easy to find.

[0012] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a front view of the overall structure of the utility model;

[0014] Figure 2 This is a top view of the overall structure of the utility model;

[0015] Figure 3 This is a front view of the mandrel of the utility model;

[0016] Figure 4 This is a top view of the mandrel of the utility model;

[0017] Figure 5 This is a front view of the pressing ring of the utility model;

[0018] Figure 6 It is a top view of the pressing ring of the utility model.

[0019] Description of reference numerals:

[0020] 1-O-ring, 2-pressure ring, 3-nut, 4-core shaft, 5-threaded hole to be tested, 6-cylinder part, 7-clamping surfaces on both sides of the pressure ring, 8-upper clamping surface, 9-upper threaded hole, 10-core shaft through hole, 11-core shaft matching surface, 12-groove, 13-pressure ring matching surface. DETAILED DESCRIPTION

[0021] In order to better understand the purpose, structure and function of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description.

[0022] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0023] like Figures 1 to 6 As shown, the utility model provides a screw hole pressure test device, including a core shaft 4, a pressure ring 2 sleeved on the middle part of the core shaft 4 and a nut 3 sleeved on the upper part of the core shaft 4, which is generally a hexagonal nut 3. The lower part of the core shaft 4 is threadedly connected to the threaded hole 5 to be pressure tested in the cylinder part 6, and the pressure ring 2 is sealed outside the middle part of the core shaft 4. A surface seal is formed between the pressure ring 2 and the top surface of the threaded hole 5 to be pressure tested in the cylinder part 6. The upper part of the core shaft 4 is sleeved with a nut 3 to press the pressure ring 2 tightly against the surface of the cylinder part 6. A vertical core shaft through hole 10 is provided in the center of the core shaft 4. An upper threaded hole 9 is provided on the top of the core shaft 4, which is threadedly connected to a pressure charging joint. The pressure charging joint is connected to a pressure charging device to charge a detection object into the threaded hole 5 to be pressure tested through the core shaft through hole 10, which is generally a liquid or a gas.

[0024] In another embodiment, the bottom surface of the pressure ring 2 is provided with a concave groove 12, in which an O-ring 1 is placed to seal the pressure ring 2 and the surface of the cylinder part 6. It is sealed by the end face, but another way of protecting the sealing ring and reducing loss is adopted.

[0025] In another embodiment, a transition fit is formed between the pressure ring matching surface 13 where the pressure ring 2 contacts the core shaft 4 and the core shaft matching surface 11 .

[0026] In another embodiment, a pair of upper end clamping surfaces 8 are disposed opposite to each other at the upper end of the core shaft 4 . To facilitate tightening the core shaft 4 , clamping surfaces are disposed on both sides of the upper end of the core shaft 4 .

[0027] In another embodiment, a pair of clamping surfaces 7 are arranged on the outer periphery of the pressure ring 2 to prevent the pressure ring 2 from rotating when the nut 3 is tightened, causing the O-ring 1 to deform or be damaged, thereby failing to form an effective seal.

[0028] In another embodiment, the middle portion of the core shaft 4 located in the pressure ring 2 is formed into a step-shaped structure, and the outer diameter of the lower portion is larger than the outer diameter of the upper portion.

[0029] The device of the present application can be used for hydraulic pressure test and air tightness test. The top of the mandrel 4 is provided with an upper threaded hole 9, which is connected to the pressure charging joint. The mandrel 4 is provided with a small-diameter mandrel through hole 10, which can be filled with gas or liquid, and a closed space is formed in the threaded hole 5 to be pressure tested through the pressure ring 2 and the O-ring 1, thereby realizing the hydraulic pressure and air tightness test of the threaded hole 5 to be pressure tested.

[0030] The specific implementation method is as follows: screw the core shaft 4 into the threaded hole 5 to be pressure tested. After the core shaft 4 is tightened, put the O-ring 1 into the groove 12 of the pressure ring 2. Assemble the pressure ring 2 in place, wherein there is a transition fit between the pressure ring mating surface 13 and the core shaft mating surface 11, to ensure that the O-ring 1 and the sealing surface above the cylinder part 6 are in good contact. After the pressure ring 2 is assembled, clamp the clamping surfaces 7 on both sides of the pressure ring with a clamp. After the nut 3 is tightened, the entire device is assembled. Screw the pressure charging joint into the threaded hole 9 at the upper end of the core shaft 4, connect the pressure charging device through the pressure charging joint, and fill the liquid or gas through the core shaft through hole 10, so as to detect whether there are leakage points in the threaded hole to be pressure tested and its surroundings, and then detect micro cracks and other defects that are not easy to find.

[0031] It can be understood that the present invention is described by some embodiments, and those skilled in the art know that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation mode. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, other modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details and the illustrations shown and described here.

Claims

1. A screw hole pressure testing device, characterized in that: It includes a core shaft, a pressure ring sleeved on the middle part of the core shaft and a nut sleeved on the upper part of the core shaft. The lower part of the core shaft is threadedly connected to the local threaded hole to be pressure tested in the cylinder. The pressure ring sealing sleeve is sleeved outside the middle part of the core shaft. A surface seal is formed between the pressure ring and the top surface of the local threaded hole to be pressure tested in the cylinder. The upper part of the core shaft is sleeved with a nut to press the pressure ring tightly against the local surface of the cylinder. A vertical core shaft through hole is provided in the center of the core shaft. The top of the core shaft has an upper threaded hole, which is threadedly connected to a pressure charging joint. The pressure charging joint is connected to a pressure charging device to charge the test object into the threaded hole to be pressure tested through the core shaft through hole.

2. The screw hole pressure testing device according to claim 1, characterized in that: The bottom surface of the pressure ring is provided with a concave groove, in which an O-type sealing ring is placed to seal the pressure ring and the local surface of the cylinder.

3. The screw hole pressure testing device according to claim 1, characterized in that: A transition fit is formed between the matching surface of the pressure ring where the pressure ring contacts the core shaft and the matching surface of the core shaft.

4. The screw hole pressure testing device according to claim 1, characterized in that: A pair of upper end clamping surfaces are arranged opposite to each other at the upper end of the core shaft.

5. The screw hole pressure testing device according to claim 1, characterized in that: A pair of clamping surfaces on both sides of the pressing ring are arranged opposite to each other on the outer periphery of the pressing ring.

6. The screw hole pressure testing device according to claim 1, characterized in that: The middle part of the core shaft located in the pressure ring is formed into a step-shaped structure, and the outer diameter of the lower part is larger than the outer diameter of the upper part.

Images