Oil cup expansion device of piston pressure gauge and piston pressure gauge

Abstract

The utility model discloses a piston pressure gauge oil cup expansion device which comprises a cylinder body, a sealing ring installation groove is arranged on the cylinder body, a sealing ring is arranged in the sealing ring installation groove, and the cylinder body is connected with an oil cup in a sealing mode through the sealing ring. According to the oil cup expansion device for the piston pressure gauge, the sealing ring is arranged in the sealing ring mounting groove, so that the structure is simple and reliable; the sealing connection between the cylinder and the oil cup is realized through the sealing ring, the mounting and dismounting are simple, the sealing ring can be replaced after being worn, the cost is low, the oil cup capacity of the piston pressure gauge can be expanded without dismounting an equipment shell or replacing the oil cup, the measuring capability of the piston pressure gauge is improved, negative effects on the function of the piston pressure gauge are avoided, the operation is convenient, and the reliability is good. A piston pressure gauge is also disclosed.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure measurement, in particular to a piston pressure gauge oil cup expansion device and a piston pressure gauge. Background Art

[0002] The piston pressure gauge is a standard pressure measuring instrument with high accuracy, high reproducibility and high reliability. It is widely used in the verification and calibration industry of pressure instruments and meters, and is mainly used for the verification and measurement of pressure standards (pressure sensors, pressure gauges, etc.).

[0003] The piston pressure gauge is made based on the principle that the force generated by the fluid pressure acting on the lower end of the piston is balanced with the gravity generated by the weight applied to the upper end of the piston. Figure 1 As shown, currently, when a piston pressure gauge is in operation, the oil circuit of the instrument under test is first connected to the piston pressure gauge's gauge socket 500. Then, a preload pump 300 is used to pump the pressure-transmitting medium (hydraulic oil) in the oil cup 200 into the downstream oil circuit. The shutoff valve of the preload pump 300 is then closed, and the pressure in the oil circuit is adjusted using a pressure regulator. When the pressure balances with the weight, the piston floats, and the pressure provided by the piston pressure gauge reaches the set value. The oil cup 200 primarily stores the pressure-transmitting medium, and its capacity determines the maximum cavity capacity of the instrument under test.

[0004] Typically, the capacity of oil cup 200 is fixed. If the cavity volume of the instrument under test is large and the amount of measuring medium in oil cup 200 is insufficient, measurement cannot be performed. To increase the capacity of oil cup 200, the original oil cup 200 must be removed and replaced with a larger capacity one. The bottom of the original oil cup 200 has a special interface, and replacing it requires removing the device casing, which is difficult to remove and can easily damage the oil circuit. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a piston pressure gauge oil cup expansion device with simple structure, simple installation and disassembly, low cost and good reliability.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A piston pressure gauge oil cup expansion device comprises a cylinder body, wherein the cylinder body is provided with a sealing ring installation groove, a sealing ring is installed in the sealing ring installation groove, and the cylinder body is sealed with the oil cup through the sealing ring.

[0008] As a further improvement of the above technical solution:

[0009] The cylinder includes an upper cylinder and a lower cylinder. A mounting step for abutting against the upper end surface of the oil cup is provided between the upper cylinder and the lower cylinder. The sealing ring mounting groove is provided on the outer wall of the lower cylinder. The outer diameter of the lower cylinder is smaller than the inner diameter of the oil cup.

[0010] There is at least one cylinder, the upper cylinder of the cylinder is docked with the lower cylinder of the adjacent cylinder to combine multiple cylinders, and the upper cylinder of the cylinder is sealed and connected with the lower cylinder of the adjacent cylinder through a sealing ring.

[0011] The inner diameter of the upper cylinder is the same as the inner diameter of the oil cup.

[0012] The top end of the upper cylinder is detachably connected with a cylinder cover.

[0013] The cylinder cover is provided with a mounting hole for mounting a pressure relief valve.

[0014] The top end of the upper cylinder is provided with a chamfer.

[0015] The sealing ring installation grooves are provided with two at intervals.

[0016] The sealing ring is an O-shaped sealing ring.

[0017] A piston pressure gauge includes a base, and an oil cup, a pre-pressure pump, a piston mechanism and a gauge socket arranged on the base. The oil cup is connected to the piston mechanism and the gauge socket respectively through the pre-pressure pump, and the above-mentioned piston pressure gauge oil cup expansion device is installed on the oil cup.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] The utility model discloses a piston pressure gauge oil cup expansion device, in which the sealing ring is installed in the sealing ring installation groove, and the structure is simple and reliable; the sealing ring is used to realize the sealed connection between the cylinder body and the oil cup, and the installation and disassembly are simple, and the sealing ring can be replaced after being worn, which is low in cost. There is no need to remove the equipment casing or replace the oil cup, so the oil cup capacity of the piston pressure gauge can be expanded, thereby improving the measuring ability of the piston pressure gauge, and will not have a negative impact on the function of the piston pressure gauge, and the operation is convenient and the reliability is good.

[0020] The piston pressure gauge of the utility model has a simple and rapid expansion operation and strong adaptability. The oil cup capacity of the piston pressure gauge can be expanded without removing the equipment casing or replacing the oil cup, thereby improving the measuring ability of the piston pressure gauge without negatively affecting the function of the piston pressure gauge. The operation is convenient and the reliability is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of an existing piston pressure gauge.

[0022] Figure 2 It is a structural schematic diagram of the piston pressure gauge of the utility model.

[0023] Figure 3 This is a cross-sectional view of the utility model when the oil cup expansion device of the piston pressure gauge is not installed.

[0024] Figure 4 It is a cross-sectional view of the utility model piston pressure gauge oil cup expansion device after installation.

[0025] The numbers in the figure indicate: 1. Cylinder; 11. Upper cylinder; 12. Lower cylinder; 13. Mounting step; 14. Cylinder cover; 141. Mounting hole; 21. Sealing ring mounting groove; 22. Sealing ring; 100. Base; 200. Oil cup; 300. Pre-load pump; 400. Piston mechanism; 500. Gauge socket; 600. Pressure relief valve. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, 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, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0029] In this utility model, unless otherwise specified or limited, the terms "assemble," "connect," "connect," "fix," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0030] Example 1:

[0031] Figure 3 and Figure 4An embodiment of the piston pressure gauge oil cup expansion device of the utility model is shown. The piston pressure gauge oil cup expansion device of this embodiment includes a cylinder 1, a sealing ring installation groove 21 is provided on the cylinder 1, a sealing ring 22 is installed in the sealing ring installation groove 21, and the cylinder 1 is sealed with the oil cup 200 through the sealing ring 22.

[0032] When in use, the piston pressure gauge oil cup expansion device of this embodiment is installed by docking the cylinder 1 with the oil cup 200 of the piston pressure gauge, and the sealing ring 22 is pressed tightly between the sealing ring installation groove 21 of the cylinder 1 and the oil cup 200 to prevent the hydraulic oil from overflowing the oil cup 200 or the cylinder 1, thereby expanding the capacity of the piston pressure gauge oil cup 200. The piston pressure gauge oil cup expansion device of this embodiment has the sealing ring 22 installed in the sealing ring installation groove 21, which has a simple and reliable structure. The sealing ring 22 realizes a sealed connection between the cylinder 1 and the oil cup 200, and the installation and removal are simple. The sealing ring 22 can be replaced after wear, which is low in cost. The oil cup capacity of the piston pressure gauge can be expanded without removing the equipment housing or replacing the oil cup 200, thereby improving the measuring capability of the piston pressure gauge without negatively affecting the function of the piston pressure gauge. The operation is convenient and the reliability is good.

[0033] Furthermore, in this embodiment, the cylinder 1 includes an upper cylinder 11 and a lower cylinder 12. A mounting step 13 is provided between the upper and lower cylinders 11, 12, for contacting the upper end surface of the oil cup 200. A sealing ring mounting groove 21 is provided on the outer wall of the lower cylinder 12. The outer diameter of the lower cylinder 12 is smaller than the inner diameter of the oil cup 200. When the cylinder 1 and the oil cup 200 are docked and installed, the lower cylinder 12 is inserted downward into the oil cup 200. When the mounting step 13 contacts the upper end surface of the oil cup 200, the cylinder 1 cannot be lowered. Once fully installed, the sealing ring 22 is tightly pressed between the outer wall of the lower cylinder 12 and the inner wall of the oil cup 200, achieving a seal between the outer wall of the lower cylinder 12 and the inner wall of the oil cup 200. When the cylinder 1 is disassembled, any residual hydraulic oil in the cylinder 1 flows into the oil cup 200, facilitating cleaning. Of course, in other embodiments, the inner wall of the cylinder 1 may be sealedly connected to the outer wall of the oil cup 200, which can increase the inner diameter of the cylinder 1 and improve the expansion capacity. However, when the cylinder 1 is disassembled, the residual hydraulic oil in the cylinder 1 can easily flow to the outer wall of the oil cup 200, which is inconvenient to clean.

[0034] Furthermore, in this embodiment, a cylinder cover 14 is detachably connected to the top of the upper cylinder 11. By removing the cylinder cover 14, hydraulic oil can be added to the cylinder 1 from the top of the upper cylinder 11; by replacing the cylinder cover 14, contaminants such as dust from the outside can be prevented from entering the cylinder 1 and the oil cup 200.

[0035] Furthermore, in this embodiment, the cylinder cover 14 is provided with a mounting hole 141 for mounting the pressure relief valve 600. In existing piston pressure gauges, the pressure relief valve 600 is mounted on the oil cup 200. Once the piston pressure gauge oil cup expansion device expands the oil cup 200, the pressure relief valve 600 can be installed through the mounting hole 141 in the cylinder cover 14, resulting in a simple structure.

[0036] Furthermore, in this embodiment, a chamfer is provided on the top of the upper cylinder 11. The chamfer on the top of the upper cylinder 11 can be used for guidance, making it easier to install and remove the cylinder cover 14.

[0037] Furthermore, in this embodiment, two sealing ring installation grooves 21 are provided at intervals. Two sealing ring installation grooves 21 are provided at intervals, and two sealing rings 22 are also provided within the sealing ring installation grooves 21. The lower sealing ring 22 contacts the hydraulic oil in the oil cup 200, sealing the hydraulic oil and preventing it from overflowing the cylinder 1 and the oil cup 200. The upper sealing ring 22 contacts the outside air and prevents external dust and other pollutants from entering the cylinder 1 and the oil cup 200. Compared with the technical solution with a single sealing ring 22, the sealing is more reliable.

[0038] Furthermore, in this embodiment, the sealing ring 22 is an O-ring, which has a simple structure and low cost.

[0039] Example 2:

[0040] Another embodiment of the piston pressure gauge oil cup expansion device of the utility model (not shown in the figure) is that the piston pressure gauge oil cup expansion device of this embodiment has a structure basically the same as that of the first embodiment, and the differences include: in this embodiment, a plurality of cylinders 1 are provided, and the upper cylinder 11 of the cylinder 1 is docked with the lower cylinder 12 of the adjacent cylinder 1 to combine the plurality of cylinders 1, and the upper cylinder 11 of the cylinder 1 is sealed and connected with the lower cylinder 12 of the adjacent cylinder 1 through a sealing ring 22.

[0041] When using the piston pressure gauge oil cup expansion device of this embodiment, the lower cylinder 12 of one cylinder 1 is inserted into the upper cylinder 11 of the adjacent (next layer) cylinder 1, and the sealing ring 22 seals the upper cylinder 11 of the cylinder 1 and the lower cylinder 12 of the adjacent cylinder 1. The lower cylinder 12 of the cylinder 1 of the lowest layer is inserted into the oil cup 200, and the sealing ring 22 of the cylinder 1 of the lowest layer seals the cylinder 1 and the oil cup 200, thereby realizing the docking combination of multiple cylinders 1 and installing them on the oil cup 200, which can further expand the oil cup capacity of the piston pressure gauge.

[0042] Furthermore, in this embodiment, the inner diameter of the upper cylinder 11 is identical to that of the oil cup 200. This allows the same-sized lower cylinder 12 to be inserted into the oil cup 200 for sealing, as well as into the upper cylinder 11 of an adjacent cylinder 1 for sealing, resulting in a simple and efficient structure. Preferably, in this embodiment, the outer diameter of the lower cylinder 12 is at least 0.5 mm smaller than the inner diameter of the oil cup 200, leaving a clearance for assembly, facilitating smooth assembly of the lower cylinder 12 and the oil cup 200.

[0043] In this embodiment, the chamfered top of the upper cylinder 11 can guide the lower cylinder 12 of the cylinder 1 to be inserted into the upper cylinder 11 of the adjacent cylinder 1, thereby facilitating the docking of multiple cylinders 1.

[0044] Example 3:

[0045] Figure 2 An embodiment of the piston pressure gauge of the utility model is shown. The piston pressure gauge of this embodiment includes a base 100, and an oil cup 200, a pre-pressure pump 300, a piston mechanism 400 and a gauge socket 500 arranged on the base 100. The oil cup 200 is connected to the piston mechanism 400 and the gauge socket 500 respectively through the pre-pressure pump 300. The oil cup 200 is installed with the piston pressure gauge oil cup expansion device of Example 1 or Example 2.

[0046] During use, the piston pressure gauge of this embodiment is mounted on the meter under test on the meter socket 500. If the instrument cavity volume is large and the hydraulic oil in the oil cup 200 is insufficient, the piston pressure gauge oil cup expansion device is installed on the oil cup 200 to expand the oil cup 200. The preload pump 300 then pumps hydraulic oil from the oil cup 200 into the piston mechanism 400 and the instrument under test for calibration. This embodiment's piston pressure gauge offers simple, rapid, and adaptable expansion. The oil cup capacity can be expanded without removing the device housing or replacing the oil cup 200, improving the piston pressure gauge's measurement capabilities without negatively impacting the gauge's functionality. It is easy to operate and highly reliable.

[0047] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the spirit and technical solution of the present invention. Therefore, any simple modification, equivalent replacement, equivalent change and modification of the above embodiments made according to the technical essence of the present invention, which does not depart from the content of the technical solution of the present invention, still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A piston pressure gauge oil cup expansion device, characterized by: The invention comprises a cylinder (1), wherein a sealing ring installation groove (21) is provided on the cylinder (1), a sealing ring (22) is installed in the sealing ring installation groove (21), and the cylinder (1) is sealedly connected to the oil cup (200) via the sealing ring (22).

2. The piston pressure gauge oil cup expansion device according to claim 1, characterized in that: The cylinder (1) comprises an upper cylinder (11) and a lower cylinder (12); a mounting step (13) for contacting the upper end surface of the oil cup (200) is provided between the upper cylinder (11) and the lower cylinder (12); the sealing ring mounting groove (21) is provided on the outer wall of the lower cylinder (12); and the outer diameter of the lower cylinder (12) is smaller than the inner diameter of the oil cup (200).

3. The piston pressure gauge oil cup expansion device according to claim 2, characterized in that: The cylinder (1) is provided with at least one, the upper cylinder (11) of the cylinder (1) is docked with the lower cylinder (12) of the adjacent cylinder (1) to combine multiple cylinders (1), and the upper cylinder (11) of the cylinder (1) is sealed and connected with the lower cylinder (12) of the adjacent cylinder (1) through a sealing ring (22).

4. The piston pressure gauge oil cup expansion device according to claim 3, characterized in that: The inner diameter of the upper cylinder (11) is the same as the inner diameter of the oil cup (200).

5. The piston pressure gauge oil cup expansion device according to claim 2, characterized in that: The top end of the upper cylinder (11) is detachably connected to a cylinder cover (14).

6. The piston pressure gauge oil cup expansion device according to claim 5, characterized in that: The cylinder cover (14) is provided with a mounting hole (141) for mounting a pressure relief valve (600).

7. The piston pressure gauge oil cup expansion device according to claim 2, characterized in that: The top end of the upper cylinder (11) is provided with a chamfer.

8. The piston pressure gauge oil cup expansion device according to any one of claims 1 to 7, characterized in that: Two sealing ring installation grooves (21) are provided at intervals.

9. The piston pressure gauge oil cup expansion device according to any one of claims 1 to 7, characterized in that: The sealing ring (22) is an O-shaped sealing ring.

10. A piston pressure gauge comprising a base (100), an oil cup (200), a pre-pressure pump (300), a piston mechanism (400), and a gauge connection base (500) arranged on the base (100), wherein the oil cup (200) is connected to the piston mechanism (400) and the gauge connection base (500) via the pre-pressure pump (300), and is characterized in that: The oil cup (200) is equipped with a piston pressure gauge oil cup expansion device according to any one of claims 1 to 9.

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