High-pressure adapter for an aluminum oil passage plate

Abstract

The utility model provides a kind of high-pressure adapter for aluminium oil circuit board, including aluminium oil circuit board and adapter body, aluminium oil circuit board has internal thread hole, its inside structure has the oil circuit that communicates with internal thread hole, adapter body includes: first cylindrical section, the middle position of its outer wall has first outer thread, for being connected with internal thread hole threadedly, the inside wall between the end outside wall of first cylindrical section and internal thread hole has spacing;Second cylindrical section, it is integrally connected with first cylindrical section, the middle position of its outer wall has second outer thread, the diameter of second cylindrical section is less than the diameter of first cylindrical section;Medium flow channel, along the axial direction of adapter body, sequentially through the inside of first cylindrical section and second cylindrical section.This utility model's high-pressure adapter reduces high-pressure stress area, i.e. increases the design thickness of first outer thread on first cylindrical section, to reduce stress, so that adapter can be installed on aluminium oil circuit board.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil line joint technical field, specifically, it displays a high pressure adapter for aluminium oil line board. BACKGROUND

[0002] The oil line board is a core hydraulic valve block assembly for controlling hydraulic oil flow direction, flow and pressure, and belongs to a standardized control element of an industrial hydraulic system, the main body of which can be made of steel or aluminium, and then integrated with elements such as a reversing valve and a safety valve through precision machining.

[0003] When the oil line board is integrated with external elements, a joint is usually used to connect the two parts.

[0004] At present, there are 150MPa quick connectors produced by multiple brands on the market, which are made of hardened steel and can usually be installed in cooperation with steel oil line boards. However, for aluminium oil line boards, the current high-pressure quick connectors cannot be well adapted to the aluminium oil line boards, and the connection stress is too large, which can cause deformation, cracking and other problems of the aluminium oil line board. INVENTION CONTENTS

[0005] The utility model aims to provide a high pressure adapter for aluminium oil line board, which can be fixed and installed without rotating the pressure gauge.

[0006] The technical scheme is as follows: A high pressure adapter for aluminium oil line board, comprising an aluminium oil line board and an adapter body, the aluminium oil line board has an internal screw hole, and an oil line is formed in the internal structure and communicates with the internal screw hole, the adapter body comprises: A first cylindrical section, the middle position of the outer wall of the first cylindrical section has a first external thread, which is used for threaded connection with the internal screw hole, and the outer side wall of the end of the first cylindrical section has a spacing with the inner side wall of the internal screw hole; A second cylindrical section, which is integrally connected with the first cylindrical section, the middle position of the outer wall of the second cylindrical section has a second external thread, and the diameter of the second cylindrical section is smaller than that of the first cylindrical section; A medium flow channel, which continuously penetrates through the inside of the first cylindrical section and the second cylindrical section along the axial direction of the adapter body.

[0007] In addition, according to the above-mentioned embodiments of the utility model, the following additional technical features can be provided: According to one embodiment of the utility model, the end of the first cylindrical section is provided with a recessed groove, the recessed groove surrounds the medium flow channel, and the inner diameter of the recessed groove is greater than the inner diameter of the medium flow channel. Ensure that the subsequent sealing ring has enough installation space.

[0008] Based on the technical scheme, the groove is filled with an O-shaped sealing ring. The sealing ring is deformed under pressure to tightly fill the gap between the groove and the end face of the internal thread hole, thereby achieving sealing and preventing high-pressure oil leakage.

[0009] According to an embodiment of the present application, the other side of the first cylindrical segment relative to the end thereof is provided with a screwing portion. The screwing portion can be a hexagonal head, a slot, an internal hexagon, etc., which provides a position for force exertion by a wrench or the like, so that the adapter can be easily and firmly screwed into the aluminum oil line plate, avoiding damage to other structures during installation.

[0010] Based on the technical scheme, the second cylindrical segment is provided with a concave annular contraction portion at the position where the second cylindrical segment is connected to the screwing portion. This reduces the stress concentration at the connection between the screwing portion and the second cylindrical segment, preventing cracking from this position.

[0011] According to an embodiment of the present application, the end of the second cylindrical segment extends outward to form a tapered end with gradually narrowing diameter. When connecting to an external standard connector, it can be more easily introduced and aligned, improving assembly efficiency and connection accuracy.

[0012] According to an embodiment of the present application, the inner diameter of the medium flow channel is not less than the inner diameter of the oil line. This ensures that the flow channel inside the adapter is at least as large as the oil line inside the aluminum plate, avoiding the adapter becoming a throttling element, thereby minimizing the flow loss and pressure drop of hydraulic oil, and ensuring system efficiency.

[0013] Compared with the prior art, the adapter of the present application has the advantages that: by reducing the high-pressure stress area, i.e. increasing the design thickness of the first external thread on the first cylindrical segment, the stress is reduced, so that the adapter can be installed on the aluminum oil line plate, reducing the weight of the finished product and the difficulty of processing, and saving production costs. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The present application relates to an adapter for an aluminum oil line plate, and particularly relates to an adapter for an aluminum oil line plate. Figure 2 The present application relates to an adapter for an aluminum oil line plate, and particularly relates to an adapter for an aluminum oil line plate. Figure 3 The present application relates to an adapter for an aluminum oil line plate, and particularly relates to an adapter for an aluminum oil line plate. Corresponding marks in the drawings: 1-aluminum oil line plate, 2-adapter body; 11-oil line, 12-internal thread hole, 21-first cylindrical segment, 22-second cylindrical segment, 23-medium flow channel, 24-O-shaped sealing ring, 25-screwing portion, 26-annular contraction portion, 27-tapered end, 211-first external thread, 212-groove, 221-second external thread. DETAILED DESCRIPTION

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1 This utility model embodiment proposes a basic implementation method for a high-voltage adapter for an aluminum oil circuit board, see reference. Figure 1 and Figure 2 As shown, it includes an aluminum oil circuit board 1 and an adapter body 2.

[0017] The aluminum oil circuit board 1 is one of the core control valve blocks of the hydraulic system. In this embodiment, it is precision-machined from aluminum alloy and has complex oil passages 11 milled inside for the flow, distribution, and control of hydraulic oil. In the application scenario of this utility model, only a partial structure is shown. The oil circuit board 1 has specific internal threaded holes 12 machined on it, and the inner wall of the internal threaded holes 12 is machined with internal threads. The internal threaded holes 12 are connected to the internal oil passages 11, forming an interface for high-pressure fluid.

[0018] The adapter body 2 is preferably made of high-strength alloy steel to withstand ultra-high pressure (e.g., 150 MPa or higher) conditions. The adapter body 2, as a whole, mainly includes a first cylindrical section 21, a second cylindrical section 22, and a medium flow channel 23 running through them.

[0019] The first cylindrical section 21 is the part of the adapter body 2 that directly connects to the aluminum oil circuit board 1. A first external thread 211 is machined in the middle of its outer wall; that is, the tail end and head end of the first cylindrical section 21 do not have the first external thread, only the middle part does. The thread depth of this first external thread 211 has been specially increased to ensure a secure threaded connection with the internal threaded hole 12 on the aluminum oil circuit board 1.

[0020] The key design lies in, such as Figure 3As shown: After the first cylindrical section 21 is fully screwed into the internal threaded hole 12 through the first external thread 211, an annular gap is reserved between the outer wall of the end of the first cylindrical section 21 and the inner wall of the internal threaded hole 12. This gap design means that the end face of the first cylindrical section 21 (i.e., the end face facing the inside of the oil circuit board) only has a narrow annular area that actually contacts and bears pressure with the end face of the internal threaded hole of the oil circuit board, while the cylindrical side face of the first cylindrical section 21 (i.e., without threads) does not contact the side face of the internal threaded hole of the oil circuit board. This greatly reduces the effective area for bearing oil pressure. According to the fluid pressure calculation formula, force = pressure × area of ​​force. Under the condition that the system pressure is constant at ultra-high pressure, reducing the effective pressure-bearing area directly leads to a significant reduction in the total axial force acting on the adapter body.

[0021] The second cylindrical segment 22 is connected to the first cylindrical segment 21 as a whole through an integral molding process (such as turning), ensuring structural strength and leak-free reliability. The diameter of the second cylindrical segment 22 is designed to be smaller than that of the first cylindrical segment 21, and a second external thread 221 is machined in the middle of its outer wall. This second external thread 221 is used to connect other high-pressure pipeline components. This design makes the adapter body 2 an adapter, with one end (the first cylindrical segment 21) securely connected to the aluminum oil circuit board 1 in a customized manner, and the other end (the second cylindrical segment 22) providing a standard interface compatible with existing high-pressure systems.

[0022] The medium flow channel 23 is a continuous, concentric through-hole running along the axial direction of the adapter body 2 through the interior of the first cylindrical section 21 and the second cylindrical section 22. It serves as the flow path for hydraulic oil, connecting the oil passage 11 inside the aluminum oil circuit board 1 with externally connected pipes or components. The minimum inner diameter of the medium flow channel 23 is set to be no less than the inner diameter of the oil passage 11 inside the aluminum oil circuit board 1. This means that the flow channel inside the adapter is not the narrowest part of the entire hydraulic system. This design prevents the adapter from becoming a throttling element, thereby minimizing hydraulic oil flow loss and pressure drop, and ensuring system efficiency.

[0023] Working principle: When the ultra-high pressure system is working, the high-pressure oil enters the medium flow channel 23 from the oil passage 11 of the aluminum oil circuit board 1. The oil pressure acts directly on the small-area annular pressure-bearing surface formed by the "spacing" at the end of the first cylindrical section 21, generating a relatively small total axial thrust. This thrust is transmitted through the adapter body 2 and is ultimately borne entirely by the thread meshing surface of the first external thread 211 and the internal thread hole 12. Since the diameter of the first external thread 211 is significantly increased, the total effective stress area of ​​its thread increases accordingly. According to the pressure formula, pressure = force / area, the pressure (i.e., stress) at the root of the thread is equal to the total axial thrust / the total effective stress area. Because the total axial thrust is reduced while the total effective stress area is increased, the stress borne by the thread of the aluminum oil circuit board is ultimately reduced to within the range that the aluminum alloy material can safely withstand.

[0024] Example 2 Based on the above embodiment 1, this embodiment further optimizes the sealing design to ensure absolute sealing reliability under ultra-high pressure conditions.

[0025] Combination Figure 1 As shown, in this embodiment, a recessed, annular groove 212 is machined at the middle position of the end face of the first cylindrical segment 21. This groove 212 surrounds the outlet of the medium flow channel 23, and its inner diameter is designed to be slightly larger than the inner diameter of the medium flow channel 23. The main function of this groove 212 is to accommodate the sealing element. The design of its inner diameter being larger than the flow channel's inner diameter ensures that the sealing element has sufficient installation space and will not be directly impacted or displaced by the high-pressure oil flow. It also provides space for the compression deformation of the sealing element.

[0026] An O-ring 24 is embedded in the groove 212. The O-ring 24 is preferably made of high-pressure resistant and oil-resistant rubber or polyurethane material. When the adapter body 2 is tightened on the aluminum oil circuit plate 1, the O-ring 24 is compressed between the end face of the groove 212 and the internal thread hole 12, undergoes elastic deformation, and tightly fills any possible micro gaps, thereby forming a reliable sealing protection.

[0027] Example 3 Based on Example 1 or Example 2, this example further optimizes the external structure of the adapter body to facilitate installation and improve long-term reliability.

[0028] See Figure 2As shown, a screwing part 25 is provided on the first cylindrical section 21 on the opposite side from its end (installation end). This screwing part 25 can take various forms, such as two parallel planes milled into the outer wall of the cylinder for easy wrench clamping, or machined into a standard hexagonal or square head shape, or having a slotted, Phillips, or internal hexagonal hole formed on the end face. The screwing part 25 provides a structure specifically for applying force with tools, allowing installers to easily and forcefully screw the adapter body 2 into the internal threaded hole 12 of the aluminum oil circuit board 1 using standard tools such as wrenches and sockets, achieving the specified preload torque. This avoids directly clamping the second cylindrical section 22 or the threaded portion during installation, preventing damage to these precision structures.

[0029] At the point where the second cylindrical section 22 meets the screwing part 25, a concave annular contraction section 26 is provided. This groove-shaped structure has the following beneficial effects: First, it forms a smooth transition area between the stress point of the screwing part 25 and the narrow-diameter second cylindrical section 22, which can significantly reduce stress concentration at the connection. Under ultra-high pressure cyclic load, sharp right-angle transitions are prone to becoming the initiation point of fatigue cracks, while the arc transition of the annular contraction section 26 can evenly distribute the stress, greatly improving the fatigue strength and service life of the adapter body 2.

[0030] The end of the second cylindrical section 22, which is the end used to connect to the external standard connector, extends outward and is machined into a tapered end 27 with a gradually narrowing diameter. This tapered end 27 can be a conical guide structure. When it is necessary to connect the external quick connector or pipeline to the adapter of this utility model, this conical guide surface can easily guide the inner hole of the mating part or the sealing ring, achieving quick and accurate alignment and insertion. This avoids problems such as seal damage, thread scratches, or installation difficulties caused by misalignment, and improves the efficiency and success rate of on-site assembly.

[0031] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A high-voltage adapter for an aluminum oil circuit board, comprising an aluminum oil circuit board (1) and an adapter body (2), wherein the aluminum oil circuit board (1) has an internal threaded hole (12) and its internal structure has an oil passage (11) communicating with the internal threaded hole (12), characterized in that, The adapter body (2) includes: The first cylindrical segment (21) has a first external thread (211) at the middle position of its outer wall for threaded connection with the internal threaded hole (12), and there is a gap between the outer wall of the end of the first cylindrical segment (21) and the inner wall of the internal threaded hole (12). The second cylindrical segment (22) is integrally formed with the first cylindrical segment (21), and has a second external thread (221) in the middle of its outer wall. The diameter of the second cylindrical segment (22) is smaller than that of the first cylindrical segment (21). The medium flow channel (23) continuously passes through the interior of the first cylindrical section (21) and the second cylindrical section (22) along the axial direction of the adapter body (2).

2. The high-pressure adapter for an aluminum oil circuit board according to claim 1, characterized in that, A recessed groove (212) is provided at the middle position of the end of the first cylindrical segment (21). The groove (212) surrounds the medium flow channel (23), and the inner diameter of the groove (212) is larger than the inner diameter of the medium flow channel (23).

3. A high-voltage adapter for an aluminum oil circuit board according to claim 2, characterized in that, The groove (212) is filled with an O-ring (24).

4. A high-voltage adapter for an aluminum oil circuit board according to claim 1, characterized in that, A screwing part (25) is provided on the other side of the first cylindrical segment (21) relative to its end.

5. A high-voltage adapter for an aluminum oil circuit board according to claim 4, characterized in that, The second cylindrical segment (22) is provided with a concave annular contraction section (26) at the position where it connects with the screwing part (25).

6. A high-voltage adapter for an aluminum oil circuit board according to claim 1, characterized in that, The end of the second cylindrical segment (22) extends outward to form a gradually narrowing end (27).

7. A high-voltage adapter for an aluminum oil circuit board according to claim 1, characterized in that, The inner diameter of the medium flow channel (23) is not less than the inner diameter of the oil passage (11).

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