Pressure gauge joint and joint

Abstract

To provide a pressure gauge joint that can be promptly and easily attached / detached with bare hands without using special tools.SOLUTION: A pressure gauge joint 1 includes a first connection part 2 connected to a pressure gauge and a second connection part 3 connected to pressure introduction means to which gas to be measured flows in. An outer periphery of the first connection part 2 has a square shape, and an outer periphery of the second connection part 3 has a cylindrical shape with a slip prevention function. The second connection part 3 / the first connection part 2 and the connected bodies (pressure gauge and pressure introduction means) connected to the second connection part 3 are promptly and easily connected / disconnected with bare hands due to the slip prevention function of the second connection part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pressure gauge coupling that can be attached to a pressure gauge, etc. and can be attached and detached by bare hands. More specifically, this coupling can be used to fasten and disconnect pipe connection couplings without using special tools for testing and calibrating (a large number of) pressure gauges or for on-site pressure measurement, and can be quickly and easily fastened and disconnected by bare hands. [Background technology]

[0002] Pressure gauges and pressure sensors are generally known as devices that are connected to pipes to measure internal pressure. The conventional method of connecting a pressure gauge to a pipe involves wrapping or covering the male thread of the pressure gauge with cloth or the like to prevent pressure leakage, and then connecting it to a connector using a wrench.

[0003] Problems with this connection method include the time it takes to wind up the Teflon (registered trademark) or other cloth, the difficulty of connecting without a tool such as a wrench, and the possibility that even if a tool such as a wrench is used, if excessive force is applied during the tightening process, the threads may be damaged, resulting in leakage pressure and resulting in measurement errors.

[0004] In particular, when testing and calibrating a large number of pressure gauges, the time required for preparatory work affects productivity and costs, so a technology that allows for easier fastening and disconnection than conventional technology is required.

[0005] Patent Document 1 discloses a connection joint for a pressure gauge. The connection joint for a pressure gauge is a joint body having a connection thread portion connected to the pressure gauge and a connection hole, one side of which is in close contact with the lower end of the joint body, the other side of which is threadedly engaged with a connecting pipe on a piping, and the inner diameter of which is formed to communicate with the connection hole. That is, two fixing nuts (a first fixing nut and a second fixing nut) are inserted so as to surround the outer periphery of the joint body, and the second fixing nut and the first fixing nut are connected by screws.

[0006] The conventional technology of Patent Document 1 includes a process of wrapping Teflon (registered trademark) around the male threaded portion of the pressure gauge, and a process of firmly fastening two fixing nuts using a wrench to prevent leakage pressure from occurring at the connection between the pressure gauge connection fitting and the piping, as in the past.

[0007] Patent Document 2 solves the problems with the technology of Patent Document 1 and provides a fitting that can be easily connected and disconnected without using additional tools and without generating leakage pressure when connecting multiple pressure gauges to piping for testing and calibration.

[0008] [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Republic of Korea Patent Publication No. 10-2014-0146363 [Patent Document 2] Republic of Korea Patent No. 10-1579911 Summary of the Invention [Problem to be solved by the invention]

[0010] However, the joints disclosed in Patent Documents 1 and 2 do not have an outer periphery shaped to be suitable for hand tightening, and require a process of firmly tightening them with a tool such as a wrench.

[0011] Therefore, in addition to the technology of Patent Document 2 proposed to solve the conventional technology of Patent Document 1, the inventors came up with an improved technology that is superior to conventional products by changing the shape of the joint, adding a locking mechanism to ensure a secure connection, and designing the pitch and depth of the threads so that they can be attached regardless of the type of thread (PT / PF). [Means for solving the problem]

[0012] In order to solve the above problems, the present invention provides the following. (1) A pressure gauge fitting having a first connection part connected to a pressure gauge and a second connection part connected to a pressure introduction means into which the gas to be measured flows, characterized in that the first connection part 2 and the second connection part are connected by a common support shaft (as a rotating shaft) that is in communication with each other. (2) A pressure gauge fitting having a first connecting part connected to a pressure gauge and a second connecting part connected to a pressure introducing means through which the gas to be measured flows, wherein the outer periphery of the first connecting part is angular and the outer periphery of the second connecting part is cylindrical and has an anti-slip function. (3) A coupling having a first connecting part connected to a measuring device and a second connecting part connected to an introduction means through which the object to be measured flows, characterized in that the outer periphery of the first connecting part is angular and the outer periphery of the second connecting part is cylindrical and has an anti-slip function. (4) In a pressure gauge fitting having a first connection part connected to a pressure gauge and a second connection part connected to a pressure introduction means into which the gas to be measured flows, wherein the first connection part 2 and the second connection part are connected by a common support shaft (as a rotation axis) communicating with each other, a method for adjusting the pitch and inner diameter of the thread of the female thread formed in the first connection part so that it can be connected to both tapered thread (PT) and straight thread (PF) shapes when connecting to the pressure gauge.

[0013] According to the present invention, the first connecting portion, the second connecting portion and other associated mechanisms work together to realize a structure that does not leak when tightened by hand, and it can be easily fastened and separated by hand without pressure leaks. Furthermore, the second connecting part has a cylindrical outer periphery with a non-slip function, which works well for hand tightening.Connections to connected objects that are connected to both the first connecting part and the second connecting part can be made by the second connecting part with a non-slip function.

[0014] Furthermore, the female thread formed in the first connecting portion has an adjustable thread pitch and inner diameter that can accommodate connection to both tapered thread (PT) and straight thread (PF) shapes when connecting to a pressure gauge. This means that a single fitting can be used to connect to both tapered thread (PT) pressure gauges and straight thread (PF) pressure gauges, and is convenient because it can be quickly and easily fastened regardless of the thread type (PT thread, PF thread, etc.). [Effects of the Invention]

[0015] The pressure gauge fitting of the present invention allows the fitting to be fastened and disconnected to a connected object by bare hands without the use of special tools, and provides a fitting that can be fastened and disconnected quickly and easily. By tightening by hand without the use of special tools, a leak-proof structure can be achieved, and damage to the threads caused by overtightening that occurs during the tightening process using a tool can be prevented. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is an external perspective view of a pressure gauge joint according to an embodiment of the present invention; [Figure 2] FIG. 4 is a perspective view showing the lower end of the pressure gauge joint. [Figure 3] FIG. 4 is a perspective view showing the upper end of the pressure gauge joint. [Figure 4] FIG. 2 is a diagram showing the state of use of this pressure gauge fitting. [Figure 5] Cross-sectional view of a pressure gauge joint. [Figure 6] A diagram showing an example of using a pressure gauge fitting. BEST MODE FOR CARRYING OUT THE INVENTION

[0017] The present invention will be described below with reference to the drawings, taking as an example a pressure gauge coupling that connects a pressure gauge to a piping adapter. However, the present invention also functions similarly in a general coupling for measuring the physical quantity of a fluid other than gas, such as hydraulic pressure.

[0018] Figure 1 shows the appearance of a pressure gauge fitting 1. The pressure gauge fitting 1 is composed of a first connection part 2 at one end and a second connection part 3 at the other end. The first connection part 2 and the second connection part 3 are connected via a common support shaft 4 that serves as a rotation axis, and the first connection part 2 and the second connection part 3 are joined by being threadedly engaged by the support shaft 4. The tip of the support shaft 4 is firmly fixed to the first connection part 2, allowing the second connection part 3 to move up and down via the gear shaft support shaft 4. The up and down movement of the second connection part 3 contributes to the ease of hand tightening when connecting to the piping adapter B, and allows for fine adjustment of the position suitable for hand tightening.

[0019] As shown in FIG. 4, a pressure gauge A and a piping adapter B are connected to both ends of the pressure gauge fitting 1, and gas introduced from the piping adapter B is sent to the pressure gauge A via a support shaft 4. The pressure gauge fitting 1 is connected by threading onto the male thread of the pressure gauge A, which has a hollow connecting pipe A1. The pressure gauge fitting 1 has a first connecting part 2 with a hexagonal nut portion on one end to facilitate easy attachment and detachment to and detachment from the pressure gauge A by hand, and the male thread of the pressure gauge A is connected by threading into a threaded hole 5 in the hexagonal nut portion. The connection between the male thread of the pressure gauge A and the pressure gauge fitting 1 requires selecting a thread shape and diameter size (inches) that conform to the respective standards. On the other hand, in a preferred embodiment of the present invention, a single fitting can accommodate both thread types: a tapered thread (PT) with a trapezoidal cross-section where the diameter gradually decreases at one end, and a straight thread (PF) with a right-angle cross-section where the diameter is the same at both ends. This allows for quick and easy fastening regardless of the thread type (PT thread, PF thread, etc.). Preferably, there are tapered threads (PT) and tapered threads (NPT), and one fitting can accommodate both tapered threads (PT) and straight threads (PF).The hexagonal shape of the hexagonal nut part of the first connecting part 2 may have the function of preventing fingers from slipping, making it easier to connect and disconnect with bare hands.

[0020] The other end of the pressure gauge fitting 1 is configured with a cylindrical second connection part 3 to make it easy to attach and detach the fitting to the piping adapter B with bare hands, and the cylindrical outer surface of the second connection part 3 is formed with a fine uneven anti-slip part 31. When the male thread of the piping adapter B is screwed into the cylindrical groove 6 of the second connection part 3, the stopper function of the anti-slip part 31 effectively works to prevent slippage of the fingers, making it easy to attach and detach the fitting with bare hands. The anti-slip part 31 is formed by machining fine grooves of depth x pitch into the cylindrical outer surface of the second connection part 3.

[0021] Referring to Figure 5, the pressure gauge fitting 1 has an O-ring of approximately the same diameter positioned at the base end of the female threaded hole formed in the first connecting portion 2 to prevent gas leakage, firmly fixing the relative positions of the pressure gauge fitting 1 and the pressure gauge A, thereby ensuring a reliable connection between them. Also, an O-ring of approximately the same diameter positioned at the base end of the female threaded hole formed in the second connecting portion 3 to prevent gas leakage is used, and a Swagelok structure is adopted to indicate when the connection with the piping adapter B is secure. The anti-slip portion 31 is operated by hand tightening to firmly fix the relative positions of the pressure gauge fitting 1 and the piping adapter B, ensuring a leak-free connection. In addition, an O-ring for preventing gas leakage is positioned between the first connecting portion 2 and the outer periphery of the support shaft 4 inserted between the first connecting portion 2 and the second connecting portion 3. These O-rings perform a sealing function to prevent leakage pressure even when tightened with bare hands.

[0022] [Usage example] Figure 6 shows an apparatus for testing and calibrating multiple pressure gauges. Pressure gauge A is fastened using pressure gauge fitting 1 and connected to piping adapter B, and pressure gauge A is tested and calibrated using the pressure of the introduced gas. [Industrial Applicability]

[0023] The pressure gauge fitting 1 (or a general-purpose fitting) of the present invention is useful as it can be quickly and easily attached and detached with bare hands without using special tools, because the structures such as the arrangement of the first connecting part, second connecting part, support shaft, and O-ring are mechanically synergistic. [Explanation of symbols]

[0024] 1 Pressure gauge fitting (fitting) 2 First connection part 3 Second connection part 4 spindle 5 screw holes 6 Cylindrical slot A pressure gauge B Piping adapter

Claims

1. a first connection part connected to a pressure gauge and a second connection part connected to a pressure introducing means into which a gas to be measured flows; A pressure gauge joint characterized in that the first connecting portion (2) and the second connecting portion (2) are connected by communicating a common support shaft.

2. a first connection part connected to a pressure gauge and a second connection part connected to a pressure introducing means into which a gas to be measured flows; A pressure gauge joint, characterized in that the outer periphery of the first connecting portion is angular, and the outer periphery of the second connecting portion is cylindrical and has an anti-slip function.

3. The measuring device has a first connection part connected to a measuring device and a second connection part connected to an introduction means through which the object to be measured flows, A joint characterized in that the outer periphery of the first connecting portion is angular, and the outer periphery of the second connecting portion is cylindrical and has an anti-slip function.

4. A pressure gauge joint having a first connection part connected to a pressure gauge and a second connection part connected to a pressure introducing means into which a gas to be measured flows, the first connection part 2 and the second connection part being connected by communicating with a common spindle, A method for adjusting the pitch and inner diameter of the thread of the female thread formed in the first connection portion so that it can be connected to both tapered thread (PT) and straight thread (PF) shapes when connecting to the pressure gauge.

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