A pressure relief device and a pressure relief method

Abstract

This invention belongs to the field of hydraulic testing, specifically relating to a pressure relief device and method. One pressure relief device includes a bearing sleeve, a pressure relief cylinder, and a pressure relief screw. During pressure relief, the pressure relief cylinder is fitted onto the top end of a quick-connect coupling, and the bearing sleeve is fitted over the quick-connect coupling and the pressure relief cylinder. The bearing sleeve is threadedly connected to the pressure relief screw. By rotating the pressure relief screw, its end presses against the pressure relief cylinder, causing the pressure relief cylinder to push open the top end of the quick-connect coupling, thus releasing pressure. The pressure relief device of this invention, through the cooperation of the bearing sleeve, pressure relief cylinder, and pressure relief screw, can easily and quickly complete the pressure relief of the quick-connect coupling, offering the advantage of improved testing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic testing, specifically relating to a pressure relief device and a pressure relief method. Background Technology

[0002] In existing technologies, such as Figure 1 In the hydraulic system shown, multiple test tasks are performed simultaneously. To save test time, after each test task is completed, a new test task is to be performed. However, the test time for each task is different, resulting in some tasks being completed while others are not. If the machine is stopped (i.e., oil injection is stopped) to replace the completed test task with the new one, the ongoing test tasks will be interrupted, leading to poor test results and reduced test efficiency.

[0003] While existing technologies use shut-off valves to disconnect completed test tasks, which removes the quick connector from the test device, connecting the quick connector to the test device for the next test task is difficult due to the high-pressure fluid enclosed inside the quick connector. Furthermore, manually pressing the top of the quick connector to release pressure is also difficult because of the high-pressure fluid inside.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] To address the technical problems existing in the prior art, the present invention provides a pressure relief device and a pressure relief method. The pressure relief device of the present invention can easily and quickly complete the pressure relief of the quick connector through the cooperation of the bearing sleeve, the pressure relief cylinder and the pressure relief screw, which has the advantage of improving test efficiency.

[0006] This invention includes the following technical solutions: The first aspect of the present invention provides a pressure relief device, including a bearing sleeve, a pressure relief cylinder, and a pressure relief screw; during pressure relief, the pressure relief cylinder is sleeved on the top end of a quick connector, the bearing sleeve is sleeved on the quick connector and the pressure relief cylinder, the bearing sleeve is threadedly connected to the pressure relief screw, and by rotating the pressure relief screw, the end of the pressure relief screw squeezes the pressure relief cylinder, causing the pressure relief cylinder to push open the top end of the quick connector to achieve pressure relief.

[0007] Furthermore, the pressure relief cylinder is provided with a receiving groove for accommodating the top head and an oil unloading channel communicating with the receiving groove, and a push rod for squeezing the top head is provided in the receiving groove.

[0008] Furthermore, it also includes a spring and a pressure pad gap sleeve; during pressure relief, the pressure pad gap sleeve and the spring are sequentially sleeved outside the top head, and the spring extends into the receiving groove and is sleeved outside the top head; the pressure relief screw squeezes the pressure relief cylinder to push the top rod open, so that the oil in the quick connector flows out from the gap between the top head and the pressure pad gap sleeve.

[0009] Furthermore, the load-bearing sleeve is radially nested outside the pressure relief cylinder and the quick connector.

[0010] Furthermore, the inner wall of the load-bearing sleeve is provided with a boss structure that is compatible with the quick connector, and the load-bearing sleeve is connected to the quick connector through the boss structure.

[0011] Furthermore, the inner wall of the load-bearing sleeve and the outer wall of the pressure relief cylinder have both arc-shaped and straight-face fits.

[0012] Furthermore, the outer wall of the pressure relief cylinder includes a first straight surface, an arc surface, and a second straight surface connected in sequence.

[0013] Furthermore, the pressure relief screw is equipped with a handle.

[0014] A second aspect of the present invention provides a pressure relief method for a quick coupling, based on the pressure relief device described above, the pressure relief method comprising: Place the pressure relief sleeve over the quick connector, and then place the load-bearing sleeve over both the pressure relief sleeve and the quick connector. Rotate the clamping screw to press the top of the quick connector with the pressure relief cylinder until oil leakage occurs, then stop rotating the clamping screw; Wait for the oil pressure of the quick coupling to slowly drop to zero.

[0015] A third aspect of the present invention provides an online pressure relief method for a quick-connect coupling in a test hydraulic system, based on the pressure relief device described above, the pressure relief method comprising: Close the shut-off valve corresponding to the test device after the test is completed; Remove the quick connector from the test apparatus after the test is completed; Place the pressure relief sleeve over the quick connector, and then place the load-bearing sleeve over both the pressure relief sleeve and the quick connector. Rotate the clamping screw to press the top of the quick connector with the pressure relief cylinder until oil leakage occurs, then stop rotating the clamping screw; Wait for the oil pressure of the quick coupling to slowly drop to zero.

[0016] By adopting the above technical solution, the present invention has the following advantages: 1. The pressure relief device of the present invention can easily and quickly complete the pressure relief of the quick connector through the cooperation of the bearing sleeve, pressure relief cylinder and pressure relief screw, which has the advantage of improving test efficiency.

[0017] 2. By further setting the gap between the spring and the pressure pad, the oil outflow channel is reduced, which means that the oil encounters great damping when it leaks out. This makes the oil leakage speed quite slow, reducing the impact force of the oil on the hydraulic seal ring inside the quick connector, protecting the hydraulic seal ring, avoiding damage to the hydraulic seal ring, and thus improving the service life of the quick connector.

[0018] 3. The pressure relief method of the present invention allows the quick connector to be smoothly reconnected to the test device when it is used again after depressurization.

[0019] 4. The pressure relief method of the present invention can relieve pressure on the quick connector without affecting other tests and without shutting off the oil source system pressure. After pressure relief, the quick connector can be quickly connected to other test devices for testing; it has the advantage of improving test efficiency.

[0020] 5. The pressure relief device of the present invention is easy to operate and has high safety.

[0021] 6. The pressure relief device of the present invention can smoothly relieve pressure with quick connectors, which facilitates the connection and installation of related oil circuits.

[0022] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention can be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the experimental hydraulic system in the background art; Figure 2 This is a schematic diagram of a pressure relief device according to an embodiment of the present invention; Figure 3 This is an exploded view of a pressure relief device according to an embodiment of the present invention; Figure 4 This is a cross-sectional view of a pressure relief device according to an embodiment of the present invention; Figure 5 This is a cross-sectional view of the pressure relief cylinder in an embodiment of the present invention; Figure 6This is a top view of the pressure relief cylinder in an embodiment of the present invention; In the diagram, 10-load-bearing sleeve, 11-boob structure, 20-pressure relief cylinder, 21-receiving groove, 22-oil unloading channel, 23-top rod, 24-first straight surface, 25-arc surface, 26-second straight surface, 30-pressure relief screw, 40-spring, 50-pressure pad gap sleeve, 60-quick connector, 61-top head. Detailed Implementation

[0025] The following description provides many different embodiments or examples for implementing various features of the invention. The elements and arrangements described in the specific examples below are only for concise expression of the invention and are merely examples, not intended to limit the invention.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The first aspect of this embodiment provides a pressure relief device, combined with Figures 2-4 As shown, it includes a load-bearing sleeve 10, a pressure relief cylinder 20, and a pressure relief screw 30. During pressure relief, the pressure relief cylinder 20 is sleeved on the top end 61 of the quick connector 60, the load-bearing sleeve 10 is sleeved on the quick connector 60 and the pressure relief cylinder 20, and the load-bearing sleeve 10 is threadedly connected to the pressure relief screw 30. By rotating the pressure relief screw 30, the end of the pressure relief screw 30 squeezes the pressure relief cylinder 20, causing the pressure relief cylinder 20 to push open the top end 61 of the quick connector 60 to achieve pressure relief.

[0028] In some embodiments, combined with Figure 5 As shown, the pressure relief cylinder 20 is provided with a receiving groove 21 for accommodating the top head 61 and an oil unloading channel 22 communicating with the receiving groove 21. The receiving groove 21 is provided with a push rod 23 for squeezing the top head 61.

[0029] In this embodiment, the quick connector 60 has a short service life. Specifically, during depressurization, oil flows out from the gap between the top head 61 and the quick connector 60, causing a strong impact on the hydraulic seal ring inside the quick connector 60, which easily damages the hydraulic seal ring. Therefore, in some embodiments, combined with... Figure 4As shown, it also includes a spring 40 and a pressure pad gap sleeve 50. During pressure relief, the pressure pad gap sleeve 50 and the spring 40 are sequentially sleeved on the outside of the top head 61, and the spring 40 extends into the receiving groove 21 and is sleeved on the outside of the top head 61. The pressure relief screw 30 squeezes the pressure relief cylinder 20, causing the push rod 23 to push open, allowing the oil in the quick connector 60 to flow out from the gap between the top head 61 and the pressure pad gap sleeve 50. There is a small gap between the top head 61 and the pressure pad gap sleeve 50. When the top head 61 opens to release oil, the oil leaks outward through this small gap with a large damping effect, resulting in a very small oil flow rate and a large pressure before the top head 61. This makes the pressure difference before and after the top head 61 very small, thereby greatly reducing pressure impact and protecting the hydraulic seal ring.

[0030] It should be noted that in the above structure, the spring 40, the pressure pad gap sleeve 50, and the positioning cylinder can be separate components, and then assembled according to the above structure during use. Preferably, one axial end of the spring 40 is welded and fixed inside the receiving groove 21, and the spring 40 is sleeved outside the top rod 23; the other axial end of the spring 40 is welded and connected to the pressure pad gap sleeve 50, and the spring 40 is sleeved outside the pressure pad gap sleeve 50.

[0031] In some embodiments, combined with Figure 4 As shown, the shape of the pressure pad gap sleeve 50 is adapted to the shape of the top head 61.

[0032] In some embodiments, combined with Figure 2 , Figure 3 As shown, the load-bearing sleeve 10 is radially nested outside the pressure relief cylinder 20 and the quick connector 60. This facilitates the assembly and disassembly of the pressure relief device and has the advantage of improving pressure relief efficiency.

[0033] In some embodiments, combined with Figure 4 As shown, the inner wall of the load-bearing sleeve 10 is provided with a boss structure 11 that is adapted to the quick connector 60. The load-bearing sleeve 10 is connected to the quick connector 60 through the boss structure 11. The boss connector of the load-bearing sleeve 10 is connected in the groove of the quick connector 60 itself, thereby obtaining a reliable load support part and avoiding relying on other surrounding parts for force. This cleverly reduces the size and weight of the device, while greatly improving the convenience of assembly.

[0034] In some embodiments, the inner wall of the load-bearing sleeve 10 and the outer wall of the pressure relief cylinder 20 have an arc surface 25 fit and a straight surface fit. This prevents the positioning cylinder from rotating inside the load-bearing sleeve 10 when the pressure relief screw is rotated, which would cause the positioning cylinder to wear the end of the quick connector 60 top piece. It also prevents the tightening torque of the entire pressure relief device from being unstable during the tightening operation.

[0035] In some embodiments, combined with Figure 6 As shown, the outer wall of the pressure relief cylinder 20 includes a first straight surface 24, an arc surface 25, and a second straight surface 26 connected in sequence. The positioning cylinder and the load-bearing sleeve 10 are automatically centered through the arc surface 25, ensuring that the positioning cylinder and the load-bearing sleeve 10 are coaxial; at the same time, the first straight surface 24 and the second straight surface 26 connected to the arc surface 25 can ensure that the positioning cylinder will not rotate inside the load-bearing sleeve 10 when it is subjected to the torque of the pressure relief screw 30, thereby ensuring that the positioning cylinder will not wear the end face of the top head 61 of the quick connector 60, and improving the stability during the tightening operation.

[0036] Preferably, the arc surface 25 is a cylindrical surface; the pressure relief cylinder 20 and the load-bearing sleeve 10 are fitted together by forming the arc surface 25 through the cylindrical surface. It is worth noting that in this embodiment, the fit between the arc surface 25 of the pressure relief cylinder 20 and the load-bearing sleeve 10 can be either surface-to-surface contact or surface-to-surface non-contact. In the surface-to-surface non-contact structure, there is a gap between the inner cylindrical surface of the load-bearing sleeve 10 and the cylindrical surface of the positioning cylinder. This ensures that the load-bearing sleeve 10, under pressure, moves downwards coaxially with the axis of the quick connector 60, avoiding an unbalanced state. The flat fit between the pressure relief cylinder 20 and the load-bearing sleeve 10 is preferably a surface-to-surface contact fit.

[0037] In some embodiments, combined with Figures 2-4 As shown, the positioning cylinder is provided with a countersunk hole that matches the diameter of the pressure relief screw, so as to constrain the pressure relief screw to press on the center of the positioning cylinder, thereby ensuring good loading.

[0038] In some embodiments, combined with Figures 2-4 As shown, the pressure relief screw 30 is equipped with a handle. Preferably, the handle is a long handle design, which makes the tightening operation easier and facilitates control of tightening torque and small feed rate.

[0039] The pressure relief screw uses the smallest possible thread size to ensure sufficient tightening force, thus reducing the tightening torque required. The thread also features a fine pitch, allowing for a smaller feed rate at the same rotation angle, resulting in excellent micro-opening control.

[0040] The second aspect of this embodiment provides a pressure relief method for a quick connector 60, implemented based on the pressure relief device described above, the pressure relief method comprising: The pressure relief cylinder 20 is fitted over the quick connector 60, and the load-bearing sleeve 10 is fitted over the pressure relief cylinder 20 and the quick connector 60. Rotate the clamping screw to press the top 61 of the quick connector 60 with the pressure relief cylinder 20 until oil leakage occurs, then stop rotating the clamping screw; Wait for the oil pressure at quick coupling 60 to slowly drop to zero.

[0041] The third aspect of this embodiment provides an online pressure relief method for a quick coupling 60 of a test hydraulic system, implemented based on the pressure relief device described above, the pressure relief method comprising: Close the shut-off valve corresponding to the test device after the test is completed; Remove the quick connector 60 from the test apparatus after the test is completed; The pressure relief cylinder 20 is fitted over the quick connector 60, and the load-bearing sleeve 10 is fitted over the pressure relief cylinder 20 and the quick connector 60. Rotate the clamping screw to press the top 61 of the quick connector 60 with the pressure relief cylinder 20 until oil leakage occurs, then stop rotating the clamping screw; Wait for the oil pressure at quick coupling 60 to slowly drop to zero.

[0042] The pressure relief method in this embodiment avoids the need to reduce the total oil source pressure when connecting the quick connector 60 under high pressure, thereby avoiding affecting other test tasks and improving the work efficiency during multi-task tests.

[0043] The terms "first," "second," etc., used in the specification and claims of this invention are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0044] All terms used in this invention (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0045] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressure relief device, characterized in that, It includes a pressure-bearing sleeve (10), a pressure-relief cylinder (20), and a pressure-relief screw (30). When relieving pressure, the pressure-relief cylinder (20) is sleeved on the top end (61) of the quick connector (60), the pressure-bearing sleeve (10) is sleeved on the quick connector (60) and the pressure-relief cylinder (20), the pressure-bearing sleeve (10) is threaded to the pressure-relief screw (30), and by rotating the pressure-relief screw (30), the end of the pressure-relief screw (30) squeezes the pressure-relief cylinder (20), so that the pressure-relief cylinder (20) pushes open the top end (61) of the quick connector (60) to achieve pressure relief.

2. The pressure relief device according to claim 1, characterized in that, The pressure relief cylinder (20) is provided with a receiving groove (21) for accommodating the top head (61) and an oil unloading channel (22) communicating with the receiving groove (21). The receiving groove (21) is provided with a push rod (23) for squeezing the top head (61).

3. A pressure relief device according to claim 2, characterized in that, It also includes a spring (40) and a pressure pad gap sleeve (50); when depressurization occurs, the pressure pad gap sleeve (50) and the spring (40) are sequentially sleeved outside the top head (61), and the spring (40) extends into the receiving groove (21) and is sleeved outside the top head (61); the pressure relief screw (30) squeezes the pressure relief cylinder (20) so that the top rod (23) pushes the top rod (23) open, so that the oil in the quick connector (60) flows out from the gap between the top head (61) and the pressure pad gap sleeve (50).

4. A pressure relief device according to claim 1, characterized in that, The load-bearing sleeve (10) is radially nested outside the pressure relief cylinder (20) and the quick connector (60).

5. A pressure relief device according to claim 4, characterized in that, The inner wall of the load-bearing sleeve (10) is provided with a boss structure (11) that is compatible with the quick connector (60). The load-bearing sleeve (10) is connected to the quick connector (60) through the boss structure (11).

6. A pressure relief device according to any one of claims 1-5, characterized in that, The inner wall of the load-bearing sleeve (10) and the outer wall of the pressure relief cylinder (20) have an arc surface (25) fit and a straight surface fit.

7. A pressure relief device according to claim 6, characterized in that, The outer wall of the pressure relief cylinder (20) includes a first straight surface (24), an arc surface (25), and a second straight surface (26) connected in sequence.

8. A pressure relief device according to claim 1, characterized in that, The pressure relief screw (30) is equipped with a handle.

9. A method for relieving pressure using a quick-connect coupling, characterized in that, Based on a pressure relief device according to any one of claims 1-8, the pressure relief method includes: The pressure relief cylinder (20) is fitted over the quick connector (60), and the load-bearing sleeve (10) is fitted over the pressure relief cylinder (20) and the quick connector (60); Rotate the clamping screw to press the pressure relief cylinder (20) against the top (61) of the quick connector (60) until oil leakage occurs, then stop rotating the clamping screw; Wait for the oil pressure of the quick coupling (60) to slowly drop to zero.

10. A method for online pressure relief of a test hydraulic system using a quick-connect coupling, characterized in that, Based on a pressure relief device according to any one of claims 1-8, the pressure relief method includes: Close the shut-off valve corresponding to the test device after the test is completed; Remove the quick connector (60) from the test apparatus after the test is completed; The pressure relief cylinder (20) is fitted over the quick connector (60), and the load-bearing sleeve (10) is fitted over the pressure relief cylinder (20) and the quick connector (60); Rotate the clamping screw to press the pressure relief cylinder (20) against the top (61) of the quick connector (60) until oil leakage occurs, then stop rotating the clamping screw; Wait for the oil pressure of the quick coupling (60) to slowly drop to zero.

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