Anti-backlash structure of safety valve

Abstract

The embodiment of the present invention relates to the field of bracket support technology, and provides an anti-recoil structure for a safety valve. The anti-recoil structure for a safety valve provided in the embodiment of the present invention includes: a piston rod, the piston rod is equipped with a support plate, and the support plate can be fixedly connected to the safety valve inlet pipe of the safety valve; a first oil cylinder, the first oil cylinder is sleeved on the rod body of the piston rod and the piston rod can be raised and lowered relative to the first oil cylinder, and a one-way valve is provided in the first oil cylinder, which can pass hydraulic oil into the area between the piston rod and the first oil cylinder as the piston rod rises. The anti-recoil structure for a safety valve provided in the embodiment of the present invention, by providing a one-way valve in the first oil cylinder, when the safety valve inlet pipe moves upward, the hydraulic oil enters the area formed by the bottom surface of the piston rod and the first oil cylinder through the one-way valve, so that the safety valve inlet pipe and the anti-recoil structure move synchronously without generating relative displacement, thereby making the discharge reaction force of the safety valve offset by the anti-recoil structure.

Description

Technical Field

[0001] The present invention relates to the technical field of bracket support, and in particular to an anti-recoil structure of a safety valve. Background Art

[0002] Safety valves are automatic valves designed to prevent pressure from exceeding a specified value by discharging the medium from the system. They are primarily used in boilers, pressure vessels, and pipelines to control pressure within a specified value, playing a crucial role in protecting personnel and equipment operations.

[0003] Steam systems are equipped with safety valves to protect high-temperature, high-pressure pipelines and equipment. When the safety valve discharges steam, the rapid flow of fluid within the pipeline generates a force on the discharge pipe. This force is transmitted to the safety valve through the discharge pipe and acts as a torque on the safety valve's interface flange and inlet pipe. When the safety valve discharges at high pressure and high flow, a significant torque is generated, necessitating the installation of an anti-recoil mechanism to offset the effects of the discharge reaction force.

[0004] Currently, anti-recoil structures generally utilize rigid supports. Since the discharge of a safety valve causes the temperature of the safety valve inlet pipe to rise, a long pipe can produce significant thermal displacement, while the support structure remains at a constant temperature. This can cause the safety valve to separate from the support structure. In this case, the support structure is unable to offset the reaction force of the safety valve, resulting in failure. The excessive discharge reaction force can cause pipeline deformation and damage to the safety valve flange, leading to steam leakage. Therefore, designing an anti-recoil structure for safety valves that can address support structure failure has become an urgent issue in the industry. Summary of the Invention

[0005] In order to solve the problem of support structure failure in the prior art, an embodiment of the present invention provides an anti-recoil structure for a safety valve.

[0006] According to one embodiment of the present invention, the anti-backlash structure of the safety valve includes: a piston rod, the piston rod is equipped with a support plate, and the support plate can be fixedly connected to the safety valve inlet pipe of the safety valve; a first oil cylinder, the first oil cylinder is sleeved on the rod body of the piston rod and the piston rod can be raised and lowered relative to the first oil cylinder, and a one-way valve is provided in the first oil cylinder, which can pass hydraulic oil into the area between the piston rod and the first oil cylinder as the piston rod rises.

[0007] According to one embodiment of the present invention, a partition is provided in the first oil cylinder, and the partition divides the chamber of the first oil cylinder into an upper chamber and a lower chamber that are connected to each other, wherein a first through hole is opened on one side wall of the upper chamber and the piston rod extends into the upper chamber, and a second through hole is opened on one side wall of the lower chamber.

[0008] According to one embodiment of the present invention, the one-way valve is provided on the partition plate and is located in the lower chamber, and the one-way valve can allow the hydraulic oil in the lower chamber to flow into the upper chamber.

[0009] According to one embodiment of the present invention, the anti-backlash structure of the safety valve further includes a second oil cylinder, which is sleeved outside the first oil cylinder and is connected to the first oil cylinder through the first through hole and the second through hole.

[0010] According to one embodiment of the present invention, a third through hole is formed on the side wall of the second oil cylinder at a position corresponding to the first through hole.

[0011] According to one embodiment of the present invention, the anti-backlash structure of the safety valve further includes a clamping bolt, which is movably disposed in the third through hole to connect or close the upper chamber of the first oil cylinder with the second oil cylinder.

[0012] According to one embodiment of the present invention, when the piston rod is in the ascending state, the one-way valve is opened and the clamping bolt is closed to disconnect the upper chamber and the second oil cylinder, so that the hydraulic oil enters the lower chamber from the second oil cylinder through the second through hole, and flows into the space of the upper chamber below the piston rod through the one-way valve.

[0013] According to one embodiment of the present invention, when the piston rod is in a descending state, the one-way valve is closed and the clamping bolt is opened to connect the upper chamber and the second oil cylinder, so that the hydraulic oil flows back from the upper chamber to the second oil cylinder through the first through hole.

[0014] According to one embodiment of the present invention, the support plate and the piston rod are connected via fasteners.

[0015] According to one embodiment of the present invention, the rod shaft of the piston rod is constructed into a first rod shaft and a second rod shaft with different diameters, wherein the diameter of the second rod shaft is larger than the diameter of the first rod shaft, and the outer wall of the second rod shaft is sealed with the inner wall of the first oil cylinder.

[0016] The anti-backlash structure of the safety valve provided in an embodiment of the present invention employs a one-way valve disposed within the first oil cylinder. When the safety valve inlet pipe moves upward, hydraulic oil enters the area formed by the piston rod bottom and the first oil cylinder through the one-way valve. This allows the safety valve inlet pipe and the anti-backlash structure to move synchronously without relative displacement, thereby offsetting the discharge reaction force of the safety valve. The anti-backlash structure of the safety valve provided in an embodiment of the present invention is suitable for use in situations where the safety valve discharge steam has high temperature, high pressure, high discharge flow, or a long safety valve inlet pipe, significantly improving the performance of the anti-backlash structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic structural diagram of an anti-backlash structure of a safety valve provided in an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A partial enlarged view of .

[0020] Description of reference numerals:

[0021] 1-first oil cylinder; 2-second oil cylinder; 3-tightening bolt; 4-one-way valve; 5-piston rod; 6-support plate; 7-fastener; 8-safety valve inlet pipe; 9-partition; 11-first through hole; 12-second through hole; 21-third channel; 51-first rod shaft; 52-second rod shaft. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0024] In addition, in the description of the present invention, unless otherwise specified, "multiple", "multiple roots", and "multiple groups" mean two or more, and "several", "several roots", and "several groups" mean one or more.

[0025] Now refer to Figure 1 and Figure 2 It should be understood that the following description is merely an illustrative embodiment of the present invention and does not constitute any particular limitation to the present invention.

[0026] like Figure 1 As shown, in one embodiment of the present invention, the anti-backlash structure of the safety valve includes: a first oil cylinder 1, a one-way valve 4, a piston rod 5 and a support plate 6. Specifically, the rod body of the piston rod 5 is sleeved in the first oil cylinder 1 and can move up and down along the inner wall of the first oil cylinder 1. A support plate 6 is installed on the flange of the piston rod 5, and the support plate 6 is fixedly connected to the safety valve inlet pipe 8 of the safety valve. When the safety valve is exhausted, the temperature of the safety valve inlet pipe 8 rises, resulting in thermal displacement, and the safety valve inlet pipe 8 moves upward, driving the support plate 6 to move upward. The support plate 6 drives the piston rod 5 to move upward, and the discharge reaction force of the safety valve is transmitted to the piston rod 5 through the support plate 6.

[0027] The first oil cylinder 1 is filled with hydraulic oil, and a one-way valve 4 is provided in the first oil cylinder 1. The one-way valve 4 only allows the hydraulic oil to flow upward through the one-way valve 4. When the piston rod 5 moves upward under the drive of the safety valve inlet pipe 8, the hydraulic oil flows through the one-way valve 4 and flows upward into the area formed by the bottom of the piston rod 5 and the first oil cylinder 1. When the safety valve inlet pipe 8 stops moving, the area formed by the bottom surface of the piston rod 5 and the first oil cylinder 1 is filled with hydraulic oil, and the hydraulic oil cannot flow downward and cannot be compressed under the action of the one-way valve 4, and the piston rod 5 cannot move downward, thereby achieving synchronous movement of the piston rod 5 and the safety valve inlet pipe 8 without generating relative displacement. The discharge reaction force is offset by the anti-recoil structure, thereby ensuring the normal operation of the anti-recoil structure and not being separated from the safety valve inlet pipe 8.

[0028] Furthermore, in one embodiment of the present invention, the first oil cylinder 1 is a cylindrical structure.

[0029] Furthermore, in one embodiment of the present invention, the support plate 6 is fixed to the safety valve inlet pipe 8 by welding. It should be understood that the shape of the first oil cylinder 1 and the connection between the support plate 6 and the safety valve inlet pipe 8 are merely illustrative and do not constitute any particular limitation to the present invention.

[0030] According to the above embodiments, the anti-backlash structure of the safety valve provided by the embodiments of the present invention utilizes a one-way valve disposed within the first oil cylinder. When the safety valve inlet pipe moves upward, hydraulic oil enters the area formed by the bottom surface of the piston rod and the first oil cylinder through the one-way valve. This allows the safety valve inlet pipe and the anti-backlash structure to move synchronously without relative displacement, thereby offsetting the discharge reaction force of the safety valve. The anti-backlash structure of the safety valve provided by the embodiments of the present invention is suitable for use in situations where the safety valve discharge steam has high temperature, high pressure, high discharge flow, or a long safety valve inlet pipe, significantly improving the performance of the anti-backlash structure.

[0031] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, a partition 9 is provided within the first cylinder 1. Specifically, the partition 9 separates the chamber of the first cylinder 1 into an upper chamber and a lower chamber that are interconnected. A one-way valve 4 is provided on the partition 9 and is located within the lower chamber, allowing hydraulic oil in the lower chamber to flow into the upper chamber through the one-way valve 4. The piston rod 5 is sleeved within the upper chamber, and when the piston rod 5 moves upward under the drive of the safety valve inlet pipe 8, the hydraulic oil in the lower chamber can flow into the upper chamber through the one-way valve 4. A first through hole 11 is provided on one sidewall of the upper chamber, and a second through hole 12 is provided on one sidewall of the lower chamber. The first through hole 11 is used when the piston rod 5 descends, for example, to drain the hydraulic oil from the lower chamber; when the piston rod 5 ascends, the second through hole 12 is used to introduce hydraulic oil into the lower chamber. This process will be described in more detail below with reference to the accompanying drawings.

[0032] In one embodiment of the present invention, the safety valve's anti-backlash structure also includes a second cylinder 2. Specifically, the second cylinder 2 is sleeved outside the first cylinder 1 and coaxially arranged with the first cylinder 1. Hydraulic oil is contained in the second cylinder 2. The second cylinder 2 communicates with the first cylinder 1 via a first through-hole 11 and a second through-hole 12. When the piston rod 5 moves upward, the hydraulic oil in the second cylinder 2 enters the lower chamber of the first cylinder 1 through the second through-hole 12, and then flows from the lower chamber into the upper chamber through the one-way valve 4.

[0033] Optionally, in one embodiment of the present invention, the second oil cylinder 2 is also a cylindrical structure.

[0034] It should be noted that the first through hole 11 and the second through hole 12 may be located on the same side of the first oil cylinder 1 or on different sides.

[0035] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the anti-backlash structure of the safety valve further includes: a clamping bolt 3. Specifically, a third through hole 21 is provided on the side wall of the second oil cylinder 2 at a position corresponding to the first through hole 11, and the clamping bolt 3 is movably disposed in the third through hole 21. When the piston rod 5 moves upward, the one-way valve 4 opens, and the clamping bolt 3 moves from the third through hole 21 to the first through hole 11, and passes through the third through hole 21 and closes the first through hole 11, so that the upper chamber of the first oil cylinder 1 is not connected to the second oil cylinder 2, and the hydraulic oil enters the lower chamber from the second oil cylinder 2 through the second channel 12, and flows through the one-way valve 4 into the area formed by the bottom surface of the piston rod 5 and the first oil cylinder 1 in the upper chamber.

[0036] When the safety valve returns to its seat, the tightening bolt 3 is removed from the first through hole 11. At this time, the one-way valve 4 is closed, and the upper chamber of the first oil cylinder 1 is connected to the second oil cylinder 2 through the first through hole 11. The hydraulic oil flows through the first through hole 11 and flows back from the upper chamber to the second oil cylinder 2. The piston rod 5 can move downward in the first oil cylinder 1. At this time, the safety valve inlet pipe 8 can also fall back to its original position.

[0037] It should be noted that the movement of the clamping bolt 3 from the third through hole 21 to the first through hole 11 can be achieved by rotating the clamping bolt 3 from the third through hole 21 to the first through hole 11, or by directly inserting the clamping bolt 3 from the third through hole 21 into the first through hole 11. The above descriptions are only two embodiments that can implement the technical solution of the present invention, and other embodiments that can implement the technical solution of the present invention are also within the scope of the present invention.

[0038] like Figure 1 As shown, in one embodiment of the present invention, the support plate 6 and the piston rod 5 are connected by a fastener 7. Alternatively, in one embodiment of the present invention, the fastener 7 is a bolt and a nut.

[0039] like Figure 1 As shown, in one embodiment of the present invention, the shaft of the piston rod 5 is constructed into a first shaft 51 and a second shaft 52 of different diameters. Specifically, the second shaft 52 is connected to the lower portion of the first shaft 51, and the diameter of the second shaft 52 is larger than that of the first shaft 51. The outer wall of the second shaft 52 is sealed against the inner wall of the first cylinder 1 to ensure that hydraulic oil does not leak through the gap between the shaft of the piston rod 5 and the inner wall of the first cylinder 1 during the upward and downward movement of the piston rod 5.

[0040] The following Figure 1The illustrated embodiment is used as an example to explain in detail the working principle of the anti-backlash structure of the safety valve of the present invention.

[0041] When the safety valve is exhausting, the temperature of the safety valve inlet pipe 8 rises, generating thermal displacement, and the safety valve inlet pipe 8 moves upward, driving the support plate 6 to move upward, and the support plate 6 drives the piston rod 5 to move upward, and the discharge reaction force of the safety valve is transmitted to the piston rod 5 through the support plate 6.

[0042] The hydraulic oil in the second oil cylinder 2 enters the lower chamber of the first oil cylinder 1 through the second through hole 12, and then enters the upper chamber of the first oil cylinder 1 through the one-way valve 4. At this time, the tightening bolt 3 closes the first through hole 11, and the hydraulic oil moves upward as the piston rod 5 moves upward, entering the area formed by the bottom of the piston rod 5 and the first oil cylinder 1. When the safety valve inlet pipe 8 stops moving, the area formed by the bottom surface of the piston rod 5 and the first oil cylinder 1 is filled with hydraulic oil, and the hydraulic oil cannot flow downward and cannot be compressed under the action of the one-way valve 4, and the piston rod 5 cannot move downward, so that the piston rod 5 and the safety valve inlet pipe 8 can move synchronously without generating relative displacement. The discharge reaction force is offset by the anti-recoil structure, thereby ensuring the normal operation of the anti-recoil structure and will not be separated from the safety valve inlet pipe 8.

[0043] When the safety valve returns to its seat, the connection between the clamping bolt 3 and the first through hole 11 is disconnected, and the hydraulic oil in the area formed by the bottom surface of the piston rod 5 in the upper chamber and the first oil cylinder 1 flows back to the second oil cylinder 2 through the first through hole 11. At this time, the one-way valve 4 is closed, and the piston rod 5 can move downward in the first oil cylinder 1. At this time, the safety valve inlet pipe 8 can also fall back to its original position.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An anti-backlash structure of a safety valve, characterized in that: include: A piston rod, wherein the piston rod is provided with a support plate, and the support plate can be fixedly connected to the safety valve inlet pipe of the safety valve; a first oil cylinder, the first oil cylinder being sleeved on the rod body of the piston rod and the piston rod being able to rise and fall relative to the first oil cylinder, the first oil cylinder being provided with a one-way valve capable of passing hydraulic oil into the area between the piston rod and the first oil cylinder as the piston rod rises; A partition is provided in the first oil cylinder, the partition dividing the chamber of the first oil cylinder into an upper chamber and a lower chamber that are connected to each other, wherein a first through hole is provided on one side wall of the upper chamber and the piston rod extends into the upper chamber, and a second through hole is provided on one side wall of the lower chamber; the one-way valve is provided on the partition and located in the lower chamber, and the one-way valve can allow the hydraulic oil in the lower chamber to flow into the upper chamber; a second oil cylinder, the second oil cylinder being sleeved outside the first oil cylinder and being connected to the first oil cylinder through the first through hole and the second through hole; a third through hole being formed on a side wall of the second oil cylinder at a position corresponding to the first through hole; A clamping bolt, which is movably arranged in the third through hole to connect or close the upper chamber of the first oil cylinder with the second oil cylinder. When the piston rod is in the rising state, the one-way valve is opened and the clamping bolt is closed to disconnect the upper chamber and the second oil cylinder, so that the hydraulic oil enters the lower chamber from the second oil cylinder through the second through hole, and flows into the space below the piston rod in the upper chamber through the one-way valve; when the piston rod is in the descending state, the one-way valve is closed and the clamping bolt is opened to connect the upper chamber and the second oil cylinder, so that the hydraulic oil flows back from the upper chamber to the second oil cylinder through the first through hole.

2. The anti-backlash structure of the safety valve according to claim 1, characterized in that: The support plate is connected to the piston rod via a fastener.

3. The anti-backlash structure of the safety valve according to claim 1, characterized in that: The piston rod has a first shaft and a second shaft having different diameters. The diameter of the second shaft is larger than that of the first shaft, and the outer wall of the second shaft is sealed with the inner wall of the first oil cylinder.

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