Novel pressure calibration device

Abstract

The utility model discloses a novel pressure calibration device which comprises a counterweight base, a pressure cylinder, a lower pressure head, a piston, a connecting rod, a pressure instrument, an air inlet valve and a pressure release valve, the pressure cylinder is formed by connecting two half cylinder bodies in a surrounding mode, the two half cylinder bodies are oppositely arranged left and right, and the lower ends of one set of half cylinder bodies are fixedly connected with an installation head. A mounting groove is formed in the top face of the balance weight base, the mounting head is inserted into the mounting groove through a threaded structure, a sliding groove is formed in the inner wall of the pressure cylinder in the radial direction, the piston is inserted into the pressure cylinder in the radial direction in a sliding mode, and a sliding strip clamped in the sliding groove in a sliding mode is arranged on the side wall of the piston. The bottom end of the lower pressing head is connected with the top end of the piston through the connecting rod, the left side wall of the lower end of the pressure cylinder is communicated with the pressure instrument through a straight-through pipe, and the right side wall of the lower end of the pressure cylinder is connected with a T-shaped pipe in a penetrating mode.

Description

Technical Field

[0001] The utility model relates to the technical field of detection, in particular to a novel pressure calibration device. Background Art

[0002] The safety valve plays a role of safety protection in the system. When the system pressure exceeds the specified value, the safety valve opens and discharges part of the gas in the system into the atmosphere, so that the system pressure does not exceed the allowable value, thereby ensuring that the system does not have an accident due to excessive pressure. Therefore, the safety valve needs to be tested for strength after production to ensure the qualified rate of the product. Generally, a strength pressure detector is used to perform strength tests on the safety valve. However, after a long-term working process, the application of the strength pressure detector is blocked by the safety valve for a long time, which generates the opposite load force, which is easy to damage or affect the application part of the strength pressure detector, and easily affect the detection part of the strength pressure detector and cause errors. In order to ensure the accuracy of the test results, pressure calibration equipment is generally used to calibrate the strength pressure detector before testing.

[0003] Chinese patent announcement No. CN 221006656 U discloses a pressure calibration device, including a cylinder, a piston is slidably connected to the upper side of the cylinder, a pressure instrument is connected to the lower side of the left end of the cylinder, and the communication position between the pressure instrument and the cylinder is located at the lower side of the piston, the lower side of the right end of the cylinder is connected to an air pipe with a switch valve, and the other end of the air pipe is connected to a quick connector, a transversely arranged top plate is arranged on the upper side of the cylinder, and two vertically arranged hollow rods are symmetrically arranged at the lower end of the top plate, the lower ends of the two hollow rods extend into the cylinder and are connected to the piston, the inner wall of the cylinder is recessed outward to form a groove, and a limiter is assembled on the groove, the limiter is located at the upper end of the piston and the limiter is located outside the two hollow rods. This design achieves the purpose of using the pressure of the gas for calibration, and can enable the pressure head in the strength pressure detector to move during calibration, thereby protecting the strength pressure detector and having good safety.

[0004] However, the utility model has the following problems when actually used:

[0005] 1. The device of the utility model is large and irregular in size and is not easy to carry.

[0006] 2. When the utility model device fails, it is not easy to disassemble and repair the interior. Utility Model Content

[0007] The purpose of the utility model is to provide a novel pressure calibration device for solving the above problems.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A novel pressure calibration device comprises a counterweight base, a pressure cylinder, a lower pressure head, a piston, a connecting rod, a pressure instrument, an air inlet valve and a pressure relief valve, the pressure cylinder comprises two semi-cylinders arranged opposite to each other on the left and right, and a mounting head is fixedly connected to the lower end of one group of the semi-cylinders, a mounting groove is provided on the top surface of the counterweight base, and the mounting head is inserted into the mounting groove through a threaded structure, a sliding groove is provided in the inner wall of the pressure cylinder along the radial direction, the piston is inserted into the pressure cylinder along the radial direction, and a sliding bar is provided on the side wall of the piston to slide and clamp in the sliding groove, the bottom end of the lower pressure head is connected to the top end of the piston through the connecting rod, the left side wall of the lower end of the pressure cylinder is connected to the pressure instrument through a straight-through pipe, and the right side wall of the lower end of the pressure cylinder is connected to a T-tube, and the air inlet valve and the pressure relief valve are respectively installed on the two branch pipes of the T-tube to control the on and off of the branch pipes.

[0010] Preferably, the piston comprises a mounting portion and a fitting portion from top to bottom, the side wall of the fitting portion is covered with an airtight layer which is in close contact with the inner wall of the pressure cylinder, the sliding bar is arranged on the side wall of the mounting portion, the lower end of the sliding bar extends to be flush with the bottom surface of the fitting portion, and the height position of the inner side wall of the lower end of the sliding groove is higher than the height position of the connection point between the straight tube and the T-tube and the pressure cylinder.

[0011] Preferably, the connecting rods include three groups, and are arranged circumferentially with the center point of the piston as the center.

[0012] Preferably, the lower end of the connecting rod is provided with a threaded head, the top surface of the mounting portion is provided with a threaded groove threadedly connected to the threaded head, the bottom surface of the lower pressing head is provided with a plug-in groove for inserting the upper end of the connecting rod, the side wall of the lower pressing head is provided with a first threaded hole, the first threaded hole extends to the plug-in groove and passes through the upper end side wall of the connecting rod, the first threaded hole is threadedly connected with a first threaded nail for fixing the connecting rod in the plug-in groove, the groove wall of the plug-in groove is radially provided with a positioning groove, and the rod wall of the connecting rod is provided with a positioning strip that is inserted into the positioning groove.

[0013] Preferably, buffer pads are respectively provided on the inner side walls at the upper and lower ends of the sliding groove.

[0014] Preferably, the enclosing surface and the bottom surface of one group of the semi-cylinders are provided with enclosing grooves, and the enclosing surface and the top surface of the mounting head of another group of the semi-cylinders are provided with enclosing strips inserted into the enclosing grooves, and the outer wall of the enclosing strip is provided with a sealing gasket that fits tightly with the groove wall of the enclosing groove.

[0015] Preferably, the enclosing surfaces of the two groups of semi-cylinders are both provided with second threaded holes penetrating through the side walls of the semi-cylinders, and the second threaded holes are threadedly connected with second threaded nails for fixing and enclosing the two groups of semi-cylinders.

[0016] Preferably, the left side wall and the right side wall of the lower end of the pressure cylinder are respectively penetrated with a first connection port and a second connection port, and the straight pipe and the T-shaped pipe are respectively inserted into the first connection port and the second connection port through a threaded structure.

[0017] Preferably, a receiving groove is provided on the top surface of the pressing head.

[0018] After adopting the above technical solution, the utility model has the following advantages compared with the background technology:

[0019] The utility model provides a novel pressure calibration device, which is easy to assemble or disassemble by arranging a pressure cylinder into two detachable semi-cylinders, and arranging a mounting head at the lower end to be detachably connected with a counterweight base, and a piston is slidably clamped in a sliding groove on the inner wall of the semi-cylinder through a sliding bar. When not in use, the device can be disassembled into various smaller parts, which are convenient to carry or store; at the same time, by disassembling the pressure cylinder, it is convenient to inspect and repair the internal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure decomposition of the pressure cylinder of the utility model;

[0022] Figure 3 This is a cross-sectional view of the internal structure of the plug-in slot of the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0024] It should be noted that in the present invention, the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention. Example

[0025] Please refer to Figures 1 to 3As shown, the utility model discloses a novel pressure calibration device, including a counterweight base 1, a pressure cylinder 2, a pressure head 3, a piston 4, a connecting rod 5, a pressure meter 6, an air inlet valve 7 and a pressure relief valve 8. The pressure cylinder 2 is formed by connecting two semi-cylinders 21 arranged opposite to each other on the left and right sides, and a mounting head 22 is fixedly connected to the lower end of one set of semi-cylinders 21. The top surface of the counterweight base 1 is provided with a mounting groove 11, and the mounting head 22 is inserted into the mounting groove 11 through a threaded structure 23. The inner surface of the pressure cylinder 2 is provided with a mounting groove 11, and the mounting head 22 is inserted into the mounting groove 11 through a threaded structure 23. A sliding groove 23 is radially opened on the wall, the piston 4 is radially slidably inserted in the pressure cylinder 2, and the side wall of the piston 4 is provided with a sliding bar 41 slidably clamped in the sliding groove 23, the bottom end of the lower pressure head 3 is connected to the top end of the piston 4 through a connecting rod 5, the lower left side wall of the pressure cylinder 2 is connected to the pressure instrument 6 through a straight pipe 24, the lower right side wall of the pressure cylinder 2 is connected to the T-tube 25, and the intake valve 7 and the pressure relief valve 8 are respectively installed on the two branch pipes of the T-tube 25 to control the on and off of the branch pipes.

[0026] When in use, the air inlet valve 7 is installed by connecting the T-tube 25 with the outlet pipeline of the external inflation device through a quick connector, then the air inlet valve 7 on the T-tube 25 is opened, the pressure relief valve 8 is closed, and the inflation device is used to fill gas into the space inside the pressure cylinder 2 and located under the piston 4 so that the air pressure in the space reaches a suitable pressure value, and then the air inlet valve 7 is closed.

[0027] The piston 4 includes a mounting portion 42 and a fitting portion 43 from top to bottom. The side wall of the fitting portion 43 is covered with an airtight layer 44 that is in close contact with the inner wall of the pressure cylinder 2, thereby improving the airtightness of the piston 4 and the pressure cylinder 2. The sliding bar 41 is arranged on the side wall of the mounting portion 42, and the lower end of the sliding bar 41 extends to be flush with the bottom surface of the fitting portion 43. The height position of the inner side wall of the lower end of the sliding groove 23 is higher than the height position of the connection between the straight pipe 24 and the T-shaped pipe 25 and the pressure cylinder 2, thereby limiting the downward pressing position of the piston 3.

[0028] The connecting rods 5 include three groups, and are arranged circumferentially with the center point of the piston 3 as the center.

[0029] A threaded head 51 is provided at the lower end of the connecting rod 5, and a threaded groove threadedly connected to the threaded head 51 is provided on the top surface of the mounting portion 42. A plug-in groove 31 is provided on the bottom surface of the lower pressing head 3 for inserting the upper end of the connecting rod 5. A first threaded hole is provided on the side wall of the lower pressing head 3. The first threaded hole extends to the plug-in groove 31 and passes through the upper end side wall of the connecting rod 5. A first threaded nail 32 is threadedly connected in the first threaded hole for fixing the connecting rod 5 in the plug-in groove 31. A positioning groove 33 is radially provided on the groove wall of the plug-in groove 31, and a positioning strip 52 is provided on the rod wall of the connecting rod 5 to be inserted into the positioning groove 33.

[0030] Buffer pads are provided on the inner side walls at the upper and lower ends of the sliding groove 22 .

[0031] The surrounding surfaces and bottom surfaces of one group of semi-cylinders 21 are provided with surrounding card grooves 26, and the surrounding surfaces of the other group of semi-cylinders 21 and the top surface of the mounting head 22 are provided with surrounding card strips 27 inserted into the surrounding card grooves 26, and the outer wall of the surrounding card strip 27 is provided with a sealing gasket that fits tightly with the groove wall of the surrounding card groove 26.

[0032] The enclosing surfaces of the two groups of semi-cylinders 21 are both provided with second threaded holes penetrating the side walls of the semi-cylinders 21 , and the second threaded holes are threadedly connected with second screws for fixing and enclosing the two groups of semi-cylinders 21 .

[0033] The left side wall and the right side wall of the lower end of the pressure cylinder 2 are respectively penetrated with a first connection port and a second connection port, and the straight pipe 24 and the T-shaped pipe 25 are respectively inserted into the first connection port and the second connection port through a threaded structure.

[0034] The top surface of the lower pressure head 3 is provided with a receiving groove 33 for receiving the pressure head in the strength pressure detector.

[0035] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A new type of pressure calibration device, characterized in that: The cam is an airtight container and a pressure relief valve is provided. The cam is connected to the pressure relief valve by a threaded structure and a pressure relief valve is provided on the top surface of the cam. The cam is provided with a plurality of pressure relief valves, each of which is connected to the pressure relief valve by a threaded structure. The cam is connected to the pressure relief valve by a threaded structure and a pressure relief valve is provided on the top surface of the cam. The pressure relief valve is connected to the pressure relief valve by a threaded structure and a pressure relief valve is provided on the top surface of the cam. The pressure relief valve is connected to the pressure relief valve by a threaded structure and a pressure relief valve is provided on the top surface of the cam.

2. A novel pressure calibration device as claimed in claim 1, characterized in that: The piston includes a mounting portion and a fitting portion from top to bottom, the side wall of the fitting portion is covered with an airtight layer that is in close contact with the inner wall of the pressure cylinder, the sliding bar is arranged on the side wall of the mounting portion, the lower end of the sliding bar extends to be flush with the bottom surface of the fitting portion, and the height position of the inner side wall of the lower end of the sliding groove is higher than the height position of the connection point between the straight pipe and the T-tube and the pressure cylinder.

3. A novel pressure calibration device as claimed in claim 2, characterized in that: The connecting rods include three groups, and are arranged circumferentially with the center point of the piston as the center.

4. A novel pressure calibration device as claimed in claim 3, characterized in that: The lower end of the connecting rod is provided with a threaded head, the top surface of the mounting portion is provided with a threaded groove threadedly connected to the threaded head, the bottom surface of the pressing head is provided with a plug-in groove for inserting the upper end of the connecting rod, the side wall of the pressing head is provided with a first threaded hole, the first threaded hole extends to the plug-in groove and passes through the upper end side wall of the connecting rod, the first threaded hole is threadedly connected with a first threaded nail for fixing the connecting rod in the plug-in groove, the groove wall of the plug-in groove is radially provided with a positioning groove, and the rod wall of the connecting rod is provided with a positioning strip that is inserted into the positioning groove.

5. A novel pressure calibration device as claimed in claim 1, characterized in that: Buffer pads are respectively arranged on the inner side walls at the upper and lower ends of the sliding groove.

6. A novel pressure calibration device as claimed in claim 1, characterized in that: The enclosing surface and the bottom surface of one group of the semi-cylinders are provided with enclosing grooves, and the enclosing surface and the top surface of the mounting head of another group of the semi-cylinders are provided with enclosing strips inserted into the enclosing grooves, and the outer wall of the enclosing strip is provided with a sealing gasket that fits tightly with the groove wall of the enclosing groove.

7. A novel pressure calibration device as claimed in claim 1, characterized in that: The enclosing surfaces of the two groups of semi-cylinders are both provided with second threaded holes penetrating through the side walls of the semi-cylinders, and the second threaded holes are internally threadedly connected with second threaded nails for fixing and enclosing the two groups of semi-cylinders.

8. A novel pressure calibration device as claimed in claim 1, characterized in that: The left side wall and the right side wall of the lower end of the pressure cylinder are respectively penetrated with a first connection port and a second connection port, and the straight pipe and the T-shaped pipe are respectively inserted into the first connection port and the second connection port through a threaded structure.

9. A novel pressure calibration device as claimed in claim 1, characterized in that: The top surface of the pressing head is provided with a receiving groove.

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