Portable pressure calibration device

Abstract

The portable pressure calibration device comprises a counterweight base, a pressure cylinder, a fastening sleeve, a lower pressing head, a piston, a connecting rod and a pressure instrument, the pressure cylinder is formed by connecting two half cylinder bodies in a surrounding mode, the two half cylinder bodies are oppositely arranged in the left-right direction, a surrounding connecting clamping groove is formed in the surrounding connecting face of one set of half cylinder bodies, and a clamping groove is formed in the surrounding connecting face of the other set of half cylinder bodies. A surrounding-connecting clamping strip inserted into the surrounding-connecting clamping groove is arranged on the surrounding-connecting face of the other half barrel body, a sealing gasket tightly attached to the groove wall of the surrounding-connecting clamping groove is arranged on the outer wall of the surrounding-connecting clamping strip, and first external threads are arranged on the outer walls of the upper end and the lower end of the pressure barrel correspondingly; the fastening sleeve is arranged at the end of the pressure cylinder in a sleeving mode, a first internal thread in threaded connection fit with the first external thread is arranged on the inner wall of the fastening sleeve, a sliding groove is formed in the inner wall of the pressure cylinder in the radial direction, and the piston is slidably inserted into the pressure cylinder in the radial direction; and a sliding strip clamped in the sliding groove in a sliding manner is arranged on the side wall of the piston.

Description

Technical Field

[0001] The utility model relates to the technical field of detection, in particular to a portable 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 portable pressure calibration device to solve the above problems.

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

[0009] A portable pressure calibration device comprises a counterweight base, a pressure cylinder, a fastening sleeve, a pressure head, a piston, a connecting rod and a pressure gauge, wherein the pressure cylinder comprises two semi-cylinders arranged opposite to each other on the left and right sides, wherein the surrounding surfaces of one group of the semi-cylinders are provided with a surrounding card groove, and the surrounding surfaces of the other group of the semi-cylinders are provided with a surrounding card strip inserted into the surrounding card groove, and the outer wall of the surrounding card strip is provided with a sealing gasket that fits tightly with the groove wall of the surrounding card groove, the outer walls of the upper and lower ends of the pressure cylinder are both provided with a first external thread, the fastening sleeve is arranged on the end of the pressure cylinder and the inner wall of the fastening sleeve is provided with a first internal thread that is threadedly connected to the first external thread, and the inner wall of the pressure cylinder is provided with a sliding groove in the radial direction The piston is radially slidably inserted in the pressure cylinder, and the side wall of the piston is provided with a sliding bar slidably clamped 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 top surface of the counterweight base is provided with a mounting groove, the inner wall of the mounting groove is provided with a second internal thread, the fastening sleeve located at the lower end of the semi-cylinder is inserted in the mounting groove and the outer wall of the fastening sleeve is provided with a second external thread threadedly connected to the second internal thread, the left side wall of the lower end of the pressure cylinder is connected to the pressure instrument through a straight pipe, and the right side wall of the lower end of the pressure cylinder is connected to a T-tube, and the two branch pipes of the T-tube are respectively provided with an intake valve and a pressure relief valve to control the on and off of the branch pipes.

[0010] Preferably, a pressure ring is provided at the top of the fastening sleeve, an annular groove is provided at the bottom of the pressure ring, and a sealing ring is embedded in the annular groove and is in close contact with the end of the pressure cylinder.

[0011] 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.

[0012] Preferably, the connecting rod includes three groups, and they are arranged circumferentially with the center point of the piston as the center of the circle, 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 pressure head is provided with a plug-in groove for inserting the upper end of the connecting rod, the side wall of the lower pressure head is provided with a threaded hole, the threaded hole extends to the plug-in groove and passes through the upper end side wall of the connecting rod, the threaded hole is threadedly connected with a 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, 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.

[0014] Preferably, a receiving groove is provided on the top surface of the pressing head.

[0015] Preferably, the bottom surface of the counterweight base is provided with an anti-slip pad.

[0016] After adopting the above technical solution, the utility model has the following advantages compared with the background technology:

[0017] The utility model provides a portable pressure calibration device, which is configured as two detachable half-cylinders, and the two half-cylinders are detachably fixedly connected by fastening sleeves at both ends with threaded structures, and the fastening sleeve at the lower end is also detachably connected to a counterweight base through a threaded structure, and a piston is slidably clamped in a sliding groove on the inner wall of the half-cylinder through a sliding bar, which is easy to assemble or disassemble. When not in use, the device can be disassembled into various smaller parts, which are convenient to carry or store; and at the same time, the pressure cylinder can be disassembled to facilitate the inspection and maintenance of internal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure decomposition of the pressure cylinder of the utility model;

[0020] Figure 3 This is a cross-sectional view of the internal structure of the plug-in slot of the utility model. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] Example

[0024] Please refer to Figures 1 to 3As shown, the utility model discloses a portable pressure calibration device, including a counterweight base 1, a pressure cylinder 2, a fastening sleeve 3, a lower pressure head 4, a piston 5, a connecting rod 6 and a pressure instrument 7. The pressure cylinder 2 is formed by two semi-cylinders 21 arranged opposite to each other on the left and right sides, wherein the surrounding surfaces of one group of semi-cylinders 21 are provided with a surrounding card groove 22, and the surrounding surfaces of the other group of semi-cylinders 21 are provided with a surrounding card strip 23 inserted into the surrounding card groove 22, and the outer wall of the surrounding card strip 23 is provided with a sealing gasket that fits tightly with the groove wall of the surrounding card groove 22, and the outer walls of the upper and lower ends of the pressure cylinder 2 are both provided with a first external thread 24, the fastening sleeve 3 is sleeved on the end of the pressure cylinder 2 and the inner wall of the fastening sleeve 3 is provided with a first internal thread connected and matched with the first external thread 24, and the inner wall of the pressure cylinder 2 is provided with a first internal thread connected and matched with the first external thread 24. A sliding groove 25 is radially opened, and the piston 5 is inserted into the pressure cylinder 2 for radial sliding movement, and a sliding bar 51 is provided on the side wall of the piston 5 and is slidably clamped in the sliding groove 25. The bottom end of the lower pressure head 4 is connected to the top end of the piston 5 through a connecting rod 6. A mounting groove 11 is opened on the top surface of the counterweight base 1, and a second internal thread is provided on the inner wall of the mounting groove 11. The fastening sleeve 3 located at the lower end of the semi-cylinder 21 is inserted in the mounting groove 11, and a second external thread 31 is provided on the outer wall of the fastening sleeve 21 for threaded connection with the second internal thread. The left side wall of the lower end of the pressure cylinder 2 is connected to the pressure instrument 7 through a straight pipe 26, and the right side wall of the lower end of the pressure cylinder 2 is connected with a T-tube 27. The two branch pipes of the T-tube 27 are respectively provided with an intake valve 8 and a pressure relief valve 9 to control the on and off of the branch pipes.

[0025] When in use, the air inlet valve 8 is installed by connecting the T-tube 27 with the outlet pipeline of the external inflation device through a quick connector, then the air inlet valve 8 on the T-tube 27 is opened, the pressure relief valve 9 is closed, and the inflation device is used to fill gas into the space inside the pressure cylinder 2 and located under the piston 5 so that the air pressure in the space reaches a suitable pressure value, and then the air inlet valve 8 is closed.

[0026] A pressure ring 32 is arranged at the top of the fastening sleeve 3 , an annular groove is arranged on the bottom surface of the pressure ring 32 , and a sealing ring 33 which is in close contact with the end of the pressure cylinder 2 is inlaid in the annular groove.

[0027] The piston 5 includes a mounting portion 52 and a fitting portion 53 from top to bottom. The side wall of the fitting portion 53 is covered with an airtight layer 54 that is in close contact with the inner wall of the pressure cylinder 2, thereby improving the airtightness of the piston 5 and the pressure cylinder 2. The sliding bar 51 is arranged on the side wall of the mounting portion 52. The lower end of the sliding bar 51 extends to be flush with the bottom surface of the fitting portion 53. The height position of the inner side wall of the lower end of the sliding groove 25 is higher than the height position of the connection between the straight pipe 26 and the T-shaped pipe 27 and the pressure cylinder 2, thereby limiting the downward pressing position of the piston 5.

[0028] The connecting rod 6 includes three groups, and they are arranged circumferentially with the center point of the piston 5 as the center of the circle. The lower end of the connecting rod 6 is provided with a threaded head 61, the top surface of the mounting portion 52 is provided with a threaded groove threadedly connected to the threaded head 61, the bottom surface of the lower pressing head 4 is provided with a plug-in groove 41 for inserting the upper end of the connecting rod 6, the side wall of the lower pressing head 4 is provided with a first threaded hole, the first threaded hole extends to the plug-in groove 41 and penetrates the upper end side wall of the connecting rod 6, the first threaded nail 42 is threadedly connected in the first threaded hole for fixing the connecting rod 6 in the plug-in groove 41, the groove wall of the plug-in groove 41 is provided with a positioning groove 43 in the radial direction, and the rod wall of the connecting rod 6 is provided with a positioning strip 62 that is inserted into the positioning groove 43.

[0029] 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 26 and the T-shaped pipe 27 are respectively inserted into the first connection port and the second connection port through a threaded structure.

[0030] The top surface of the pressing head 4 is provided with a receiving groove 43 for receiving the pressure head in the strength pressure detector. The bottom surface of the weight base is provided with an anti-skid pad.

[0031] 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 portable pressure calibration device, characterized in that: The pressure cylinder comprises a counterweight base, a pressure cylinder, a fastening sleeve, a pressure head, a piston, a connecting rod and a pressure gauge, wherein the pressure cylinder comprises two semi-cylinders arranged opposite to each other on the left and right sides, wherein the connecting surfaces of one group of the semi-cylinders are provided with a connecting groove, and the connecting surfaces of the other group of the semi-cylinders are provided with a connecting strip inserted into the connecting groove, and the outer wall of the connecting strip is provided with a sealing gasket which is tightly fitted with the groove wall of the connecting groove, the outer walls of the upper and lower ends of the pressure cylinder are both provided with a first external thread, the fastening sleeve is arranged on the end of the pressure cylinder and the inner wall of the fastening sleeve is provided with a first internal thread which is threadedly connected to the first external thread, the inner wall of the pressure cylinder is provided with a sliding groove along the radial direction, and the piston is provided with a first internal thread which is threadedly connected to the first external thread. A radial sliding member is inserted in the pressure cylinder, and a sliding bar is provided on the side wall of the piston, which is slidably clamped 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. A mounting groove is provided on the top surface of the counterweight base, and a second internal thread is provided on the inner wall of the mounting groove. A fastening sleeve located at the lower end of the semi-cylinder is inserted in the mounting groove, and a second external thread is provided on the outer wall of the fastening sleeve to be threadedly connected with the second internal thread. 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 through-connected with a T-tube. An intake valve and a pressure relief valve are respectively provided on the two branch pipes of the T-tube to control the on and off of the branch pipes.

2. A portable pressure calibration device according to claim 1, characterized in that: A pressure ring is arranged at the top of the fastening sleeve, an annular groove is arranged at the bottom of the pressure ring, and a sealing ring which is in close contact with the end of the pressure cylinder is inlaid in the annular groove.

3. A portable 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.

4. A portable pressure calibration device as claimed in claim 3, characterized in that: The connecting rod includes three groups, and they are arranged circumferentially with the center point of the piston as the center of the circle. The lower end of the connecting rod is provided with a threaded head, and 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 pressure head is provided with a plug-in groove for inserting the upper end of the connecting rod. The side wall of the lower pressure head is provided with a threaded hole, and the threaded hole extends to the plug-in groove and passes through the upper end side wall of the connecting rod. A threaded nail is threadedly connected to the threaded hole for fixing the connecting rod in the plug-in groove. The groove wall of the plug-in groove is provided with a positioning groove in the radial direction, and the rod wall of the connecting rod is provided with a positioning strip that is inserted into the positioning groove.

5. A portable 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.

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

7. A portable pressure calibration device as claimed in claim 1, characterized in that: The bottom surface of the counterweight base is provided with an anti-skid pad.

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