A transformer needle type oil sampling valve structure

Abstract

The utility model discloses a transformer needle type oil sampling valve structure, structure includes oil sampling valve body, has valve body, valve core, oil -resistant rubber plug and connection interface, plug seat, one end is screwed with the one end of valve body, and the other end is used for and flange welding, valve cap, screw in the other end of valve body, wherein, valve cap is rectangular structure. Change the traditional circular valve cap to rectangular structure, increase the contact area of finger or tool, and utilize the edge to provide reliable force point, significantly improve the antiskid performance and torque transmission efficiency, solve the problem of easy to slip, open difficult when bare-handed operation, simultaneously, rectangular structure can be closely combined with the various general tools such as open end wrench, open end wrench, key wrench, need not special tool to operate, improve tool compatibility and on -the -spot applicability.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary devices for power equipment, and specifically relates to a structure of a transformer needle-type oil sampling valve. Background Technology

[0002] In power systems, oil-immersed transformers, as core transmission and transformation equipment, directly affect the safety and stability of the power grid. To monitor the internal insulation condition of transformers, it is necessary to periodically collect insulating oil samples for physicochemical and electrical performance testing. The needle-type oil sampling valve is a key component for oil sample collection, typically installed outside the transformer tank. The valve is opened by rotation, allowing the oil sample to flow into the sampling container. Most needle-type oil sampling valves widely used in existing technologies are equipped with a circular knurled valve cap. This structure increases hand friction by machining knurled patterns on the surface of the cylindrical valve cap, facilitating manual rotation.

[0003] However, this circular knurled valve cap has significant drawbacks. Due to its small contact area and the ease with which the knurling wears off, it often slips when operated by hand, especially when wearing gloves or with wet hands, making it difficult to open. It must be gripped and rotated with pliers, which can easily scratch and deform the surface of the valve seat, further exacerbating the slippage problem. At the same time, the circular structure is difficult to fit well with general-purpose tools such as adjustable wrenches and box wrenches, resulting in poor tool compatibility and inconvenience in on-site operation. In addition, in emergency repair scenarios, the slow opening affects the timeliness of oil sample collection, posing safety hazards and delay risks, seriously affecting the efficiency, safety, and reliability of sampling operations. Utility Model Content

[0004] This utility model provides a transformer needle-type oil sampling valve structure to solve the technical defects of existing needle-type oil sampling valves, such as easy slippage of the circular valve cap, difficulty in manual operation, poor tool compatibility, and low safety.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A transformer needle-type oil sampling valve structure includes: The oil sampling valve body includes a valve body, a valve core, an oil-resistant rubber plug, and a connection interface; The plug seat has one end screwed to one end of the valve body and the other end used for welding to the flange. A valve cap is screwed to the other end of the valve body; wherein the valve cap has a rectangular structure.

[0006] In one optional embodiment, the valve cap is a regular square prism structure, with all four sides being planar structures and adjacent sides forming a 90-degree angle.

[0007] In one alternative embodiment, all four sides are provided with knurled patterns.

[0008] In one alternative embodiment, the knurling pattern is a straight knurling or a mesh pattern.

[0009] In one optional embodiment, the knurling depth of the straight knurling structure is 0.3mm to 0.8mm; or, the knurling depth of the mesh knurling structure is 0.3mm to 0.8mm.

[0010] In one optional embodiment, the knurling spacing of the knurling pattern is 0.5mm to 1.2mm.

[0011] In one alternative embodiment, a sealing gasket is provided between the plug seat and the valve body.

[0012] In one alternative embodiment, the valve cap has a square cross-section.

[0013] Compared with the prior art, the present invention has the following beneficial effects: By changing the traditional round valve cap to a rectangular structure, the contact area for fingers or tools is increased, and the corners provide a reliable point of force application, significantly improving anti-slip performance and torque transmission efficiency. This solves the problems of slippage and difficulty in opening when operating by hand. At the same time, the rectangular structure can fit closely with a variety of general-purpose tools such as adjustable wrenches, open-end wrenches, and box wrenches, allowing operation without special tools and improving tool compatibility and field applicability. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A schematic diagram of the overall structure of a transformer needle-type oil sampling valve provided by this utility model; Figure 2 A schematic diagram of the plug seat in a transformer needle-type oil sampling valve structure provided by this utility model; The components are: 1. Plug seat; 101. Plug seat body; 102. Welded end; 2. Oil sampling valve body; 3. Valve cap; 4. Flange. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0021] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] To address the technical deficiencies mentioned in the background section, this embodiment provides a transformer needle-type oil sampling valve structure.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings: See Figures 1-2 This utility model embodiment provides a transformer needle-type oil sampling valve structure, including: an oil sampling valve body 2, having a valve body, a valve core, an oil-resistant rubber plug, and a connection interface; a plug seat 1, one end of which is screwed to one end of the valve body, and the other end is used for welding to a flange 4 or a tank wall; a valve cap 3, which is screwed to the other end of the valve body; wherein, the valve cap 3 has a rectangular structure.

[0024] from Figure 1 As can be seen from the above structure, the plug seat 1 includes a plug seat body 101, which has a welding end 102. The welding end 102 is welded to the flange 4 or the wall of the tank. The valve cap 3 is installed on the end of the oil sampling valve body 2 away from the plug seat 1. In practice, the oil sampling valve body 2 is used to realize the oil circuit on / off control and the connection with the external sampling device. The plug seat 1 is used as an external operating element, which transmits torque to the valve core through rotation, thereby completing the valve opening and closing process. The oil sampling valve body 2 includes a valve body, a valve core, an oil-resistant rubber plug and a connection interface. The valve body constitutes the main structure of the fluid channel and is usually made of corrosion-resistant metal materials, such as brass or stainless steel. It has an oil supply channel inside and is welded or threaded to the transformer tank.

[0025] The valve core is installed in the valve body, with one end extending out of the valve body and screwed to the plug seat 1. The other end is provided with a conical or needle-shaped sealing surface, which works with the sealing seat in the valve body to achieve the sealing function. The oil-resistant rubber plug is located at the end of the valve core. It usually adopts a composite structure with elastic material covering the metal core, which can fit tightly against the valve seat in the closed state to prevent oil leakage. The connection interface is located on the outlet side of the valve body and is used to connect the sampling hose or quick connector.

[0026] The valve cap 3 has a rectangular structure. As the part directly operated by the user, its shape differs from the traditional cylindrical knurled knob. Instead, it is designed as a three-dimensional structure with a rectangular cross-section, which can be selected as a regular square prism shape. This makes all four sides flat and forms clear 90° angles between adjacent sides. This geometric shape facilitates the application of gripping force by the fingers in multiple directions, and the mechanical interlocking effect formed by the edges increases friction resistance. On the other hand, it also provides a reliable clamping surface for various standard hand tools (such as open-end wrenches, box wrenches, and adjustable wrenches) to prevent tool slippage. The valve cap 3 can be directly inserted into the wrench for rotation operation, which can efficiently open or close the valve without special tools, greatly improving the flexibility and versatility of on-site operations.

[0027] Through the above technical solution, this application has achieved a fundamental improvement on the operating structure of the traditional needle-type oil sampling valve, so that a stable contact surface and sufficient friction can be obtained during operation, whether by hand or with the help of tools, effectively solving the problem of operation difficulties caused by slippage.

[0028] In this embodiment, the valve cap 3 is a regular square prism structure with four planar sides and a 90-degree angle between adjacent sides. By designing the valve cap 3 as a regular square prism structure and forming a clear 90-degree angle between adjacent sides, a knob structure that is stable to operate, non-slip and reliable, and easy to hold with tools is provided.

[0029] In practice, the valve cap 3 has a regular square prism structure, meaning that its overall shape is an upright prism with a square cross-section and four completely symmetrical sides extending along the axis. This structure is different from the traditional circular or cylindrical knobs. Its geometric shape has a high degree of regularity and symmetry, so that a consistent operating experience can be obtained no matter which direction the rotational torque is applied.

[0030] The design of a regular square prism not only facilitates mold forming and mass production, but also ensures that there is no need to distinguish angles and orientations during assembly, thus improving production efficiency and assembly fault tolerance.

[0031] As an alternative implementation, the side length of the regular square prism can be selected from 15mm to 30mm to balance finger grip comfort and wrench compatibility; for example, in space-constrained applications, a smaller version with a side length of 18mm can be used, while in applications requiring greater torque transmission, a larger version with a side length of 25mm or more can be selected.

[0032] All four sides are flat, with no curvature or arc on any side surface, presenting a smooth and even contact surface. This allows fingers to more effectively conform to the surface when rotating by hand, avoiding localized force concentration or slippage caused by curved surfaces. At the same time, the flat structure also provides a gripping area for standard hand tools (such as open-end wrenches, box wrenches, and adjustable wrenches), allowing the tool jaws to fully conform to the knob surface, thereby achieving efficient torque transmission and reducing the risk of slippage.

[0033] As an alternative, some sides can be designed as a slightly concave arc surface (radius of curvature ≥ 50mm) to improve grip comfort, while still retaining the overall near-planar functional characteristics, without deviating from the core concept of this embodiment.

[0034] The formation of a 90-degree angle between adjacent sides means that the angle between two intersecting planes is exactly 90°, forming a clearly visible right-angled edge. This edge plays a crucial role in mechanical fulcrum during operation. When the operator applies force by gripping the angle with their thumb and forefinger, the angle can be embedded into the fingertip to form a mechanical interlocking effect, effectively preventing lateral slippage during rotation.

[0035] In addition, the edge can guide the tool to be correctly positioned, avoiding uneven force or damage caused by tilting the wrench. In terms of manufacturing process, the integrity and consistency of the edge can be ensured by precision turning or injection molding. For high-intensity use environments, the edge can also be slightly blunted (bevel width ≤ 0.2mm) to reduce the risk of scratches while retaining functionality, thus balancing safety and durability.

[0036] Through the above technical solution, this application enables operators to obtain a stable grip and reliable torque transmission path when opening or closing the valve. It effectively solves the problems of slippage and poor tool compatibility of traditional knurled valve caps during manual operation, improving operational stability and safety. Especially in low-temperature winter environments or when working with insulated gloves, it still ensures smooth opening and closing, avoiding safety hazards such as hand fatigue, tool slippage, and even personal injury caused by slippage. Furthermore, the standardized geometric shape facilitates large-scale production and quality control, possessing significant engineering application value.

[0037] In this embodiment, knurling is provided on all four sides to enhance the gripping stability between the hand or tool and the valve cap 3. The knurling is distributed on all four sides of the valve cap 3 to ensure that the operator can obtain uniform and reliable friction feedback no matter which direction the rotational torque is applied.

[0038] Optionally, the knurling extends continuously along the height of the valve cap 3, covering the entire effective operating area on the side, with a length ranging from 8mm to 20mm, to match the finger grip size or wrench clamping stroke.

[0039] Knurling patterns can be achieved using various forming methods. For example, a knurling tool can be used to imprint the outer surface of the valve cap 3 on a lathe to form raised patterns of plastic deformation. Alternatively, a precise and controllable surface microstructure can be constructed on the valve cap 3 of a special material (such as stainless steel or aluminum alloy) by laser engraving or electrochemical etching.

[0040] Through the above technical solution, this application achieves significant improvement in frictional performance during operation by strengthening the surface texture of all sides while maintaining the basic geometric shape of the valve cap 3. This ensures a consistent high frictional response regardless of the grip angle or tool clamping direction, solving the technical problem of slippage of traditional circular valve cap 3 under wet, oily, or gloved conditions. As a result, it achieves the technical effects of improving operational reliability, reducing opening difficulty, and reducing the risk of personal injury.

[0041] In this embodiment, the knurling pattern is either straight-knot or mesh-like. The straight-knot pattern is distributed in parallel lines along the axial or circumferential direction of the valve cap 3, forming unidirectional linear ridges, suitable for applications where torque is primarily borne in a single rotational direction. The mesh-like pattern consists of two sets of intersecting oblique knurling, typically at 60° or 90° angles, forming diamond or square grid-like protrusions, providing uniform anti-slip capability in multiple directions. Both structures can be formed on the metal surface using a cold extrusion rolling process, exhibiting good wear resistance and consistency.

[0042] In this embodiment, the knurling depth of the straight knurling structure is 0.3mm~0.8mm; or, the knurling depth of the mesh knurling structure is 0.3mm~0.8mm; wherein, the knurling depth refers to the vertical height of the regular concave and convex textures processed on the side of the valve cap 3, that is, the distance from the peak of the texture to the valley. This parameter directly affects the coefficient of friction between the finger or tool and the valve cap 3 as well as the local stress distribution of the material.

[0043] For knurling, linear protrusions and grooves extend along the axial or circumferential direction of the valve cap. When the depth is controlled between 0.3mm and 0.8mm, it can provide obvious tactile feedback and lateral resistance during manual operation, effectively preventing slippage. When the depth is less than 0.3mm, the texture is too shallow and it is difficult to form sufficient friction, especially in humid, oily, or gloved environments, it is prone to failure. When the depth exceeds 0.8mm, stress will be concentrated at the root of the groove, which may cause microcracks to propagate during repeated torque application, reducing fatigue life. At the same time, excessively deep grooves are more likely to accumulate dust, sludge, and other impurities, increasing cleaning difficulty and affecting appearance quality.

[0044] For knurled finishes, which consist of intersecting diagonal or transverse lines forming diamond, square, or polygonal grid patterns, excellent multi-directional anti-slip performance is exhibited within a depth range of 0.3mm to 0.8mm. This depth ensures that each grid unit has sufficient three-dimensionality to enhance grip stability without sharpening the edges due to excessive cutting, thus avoiding the risk of scratches to operators during manual rotation. Furthermore, actual testing has verified that this knurling depth allows for completely slip-free power transmission when held with a standard adjustable wrench, meeting the high torque requirements of emergency situations.

[0045] As an optional embodiment, straight knurling can be formed using a unidirectional embossing process with a pitch of 0.6 mm and a depth of 0.5 mm, which is suitable for applications requiring high symmetry and mainly bearing loads in a single rotational direction. In another variant, knurling can be formed using a 60° intersecting diamond pattern with a depth of 0.4 mm, which is suitable for working conditions requiring frequent forward and reverse operations and improves the consistency of bidirectional control.

[0046] Although the two types of knurling have different structures, they can achieve similar functional effects within the same depth range: providing a reliable mechanical interlocking interface on a macroscopic level and maintaining a reasonable surface roughness (Ra value of about 6.3~12.5μm) on a microscopic level, thereby reconciling the contradiction between human-computer interaction performance and structural durability.

[0047] In this embodiment, the knurling spacing of the knurling pattern is 0.5mm~1.2mm, which makes the surface of the valve cap 3 have sufficient friction point distribution density to prevent slippage, while avoiding the processing difficulties and maintenance problems caused by excessively dense patterns. This improves operational reliability and product durability, solves the technical problems of traditional knurling structures being prone to slippage and difficult to clean in complex environments, and achieves the dual effect of improving anti-slip performance and manufacturing feasibility.

[0048] In this embodiment, a sealing gasket is provided between the plug seat 1 and the valve body to effectively prevent leakage of transformer insulating oil when the valve is closed, thereby improving the safety and environmental adaptability of the equipment operation.

[0049] In this embodiment, the cross-section of the valve cap 3 is square. This square structure makes the valve cap 3 present a regular and symmetrical shape, which is convenient to ensure dimensional consistency and form and position tolerance control during processing and manufacturing. At the same time, it is beneficial to the positioning and cooperation with other components during assembly. The square cross-section design changes the force distribution characteristics of the traditional circular knob, so that it can provide a stable contact surface when operated manually or with tools, avoiding operation failure caused by contact point slippage. This structure is particularly suitable for transformer oil sampling operations that require frequent opening and closing or are in harsh working conditions.

[0050] Through the above technical solution, this application achieves the optimization of the cross-sectional shape of the valve cap 3 by adopting a square structure instead of the traditional circular design, thereby improving the fit and friction between the valve cap 3 and the operating tool. This effectively solves the problems mentioned in the background art, such as easy slippage during manual operation, poor tool compatibility, and difficulty in emergency opening. This structure not only enhances the convenience and safety of operation, but also improves the versatility and response speed of on-site operation and maintenance, and is particularly suitable for oil sample collection in power systems where high operational reliability is required.

[0051] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A transformer needle-type oil sampling valve structure, characterized in that, include: The oil sampling valve body includes a valve body, a valve core, an oil-resistant rubber plug, and a connection interface; The plug seat has one end screwed to one end of the valve body and the other end used for welding to the flange. A valve cap is screwed to the other end of the valve body; wherein the valve cap has a rectangular structure.

2. The structure of a transformer needle-type oil sampling valve according to claim 1, characterized in that, The valve cap is a regular square prism structure with four planar sides, and a 90-degree angle is formed between adjacent sides.

3. The structure of a transformer needle-type oil sampling valve according to claim 2, characterized in that, All four sides are decorated with knurled patterns.

4. The structure of a transformer needle-type oil sampling valve according to claim 3, characterized in that, The knurling pattern is a straight or reticulated structure.

5. The structure of a transformer needle-type oil sampling valve according to claim 4, characterized in that, The knurling depth of the straight-lined structure is 0.3mm~0.8mm; Alternatively, the knurling depth of the reticulated structure is 0.3mm to 0.8mm.

6. The structure of a transformer needle-type oil sampling valve according to claim 4, characterized in that, The knurling spacing of the knurling pattern is 0.5mm~1.2mm.

7. The structure of a transformer needle-type oil sampling valve according to claim 1, characterized in that, A sealing gasket is provided between the plug seat and the valve body.

8. The structure of a transformer needle-type oil sampling valve according to claim 1, characterized in that, The valve cap has a square cross-section.

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