A fuse device for fireproof electro-hydraulic actuator

Abstract

A fuse device for a fireproof electro-hydraulic actuator. Relates to an electro-hydraulic actuator. It comprises a valve body, a reverse one-way valve, a two-way sealing piston and a fusible plug. A channel one is provided at the upper part of one end of the valve body, a channel two is provided at the middle part of the other end, a middle hole is provided in the middle of the valve body, and the channel one and the channel two are connected to the middle hole respectively; the reverse one-way valve is provided at the top of the middle hole, the fusible plug is provided at the bottom of the middle hole, and the channel one is connected to the chamber of the reverse one-way valve; the two-way sealing piston is movably provided in the middle hole and is located between the reverse one-way valve and the fusible plug. The two-way sealing piston comprises a piston body, an upper rod is provided at the top of the piston body and a lower rod is provided at the bottom. When a fusible body is provided in the fusible plug, the upper rod is used to contact the valve core in the reverse one-way valve, and the lower rod is used to contact the fusible body. The present invention is convenient to process and reliable to operate.

Description

Technical Field

[0001] The invention relates to an electro-hydraulic actuator, in particular to a fuse device for a fireproof electro-hydraulic actuator. Background Art

[0002] The electro-hydraulic actuator is a device that converts the standard input signal into a 0-degree to 90-degree angular displacement output torque or linear displacement output force corresponding to the input signal through electro-hydraulic conversion and hydraulic amplification. It has great advantages over traditional pneumatic actuators and electric actuators, with the characteristics of large stroke, large thrust or torque, fast response time, high sensitivity, and compact structure.

[0003] With the continuous development of the electro-hydraulic actuator industry, the petrochemical industry has higher and higher requirements for the safety of the electro-hydraulic actuator industry. In the event of a fire, the electro-hydraulic actuator is required to automatically perform safety actions to ensure safety. At present, during the use of electro-hydraulic actuators, the fusible plug completely melts at high temperature, causing the hydraulic oil to leak out, posing a safety hazard. Summary of the invention

[0004] In view of the above problems, the present invention provides a fuse device for a fireproof electro-hydraulic actuator which has a simple structure and improved safety.

[0005] The technical solution of the present invention is: comprising a valve body, a reverse one-way valve, a two-way sealing piston and a fusible plug, wherein a channel 1 is provided at the upper part of one end of the valve body, a channel 2 is provided at the middle part of the other end, a middle hole is provided in the middle of the valve body, and the channel 1 and the channel 2 are respectively connected to the middle hole;

[0006] The reverse check valve is arranged at the top end of the middle hole, the fusible plug is arranged at the bottom end of the middle hole, and the channel 1 is connected to the chamber of the reverse check valve;

[0007] The bidirectional sealing piston is movably arranged in the middle hole and is located between the reverse one-way valve and the fusible plug.

[0008] The bidirectional sealing piston comprises a piston body, wherein an upper rod is provided on the top of the piston body and a lower rod is provided on the bottom. When a fusible body is provided in the fusible plug, the upper rod is used to contact the valve core in the reverse one-way valve, and the lower rod is used to contact the fusible body.

[0009] A central hole is arranged in the middle of the fusible plug, an annular groove is arranged in the middle of the central hole, and the fusible body is located in the central hole and the annular groove.

[0010] The fusible plug is connected in the middle hole by threads.

[0011] The reverse one-way valve comprises a one-way valve body, the chamber is located in the middle of the one-way valve body, and the chamber comprises an upper chamber, a middle chamber and a lower chamber connected from top to bottom.

[0012] The valve core comprises a rod body, which is adaptively arranged in the middle cavity, and an upper rod head is arranged on the top of the rod body and a lower rod head is arranged on the bottom of the rod body.

[0013] The cross sections of the upper rod head and the lower rod head are both larger than the cross section of the middle cavity. The upper rod head is located in the upper cavity, and the lower rod head is located in the lower cavity.

[0014] A spring is sleeved on the rod body below the upper rod head, and the spring is located in the upper cavity;

[0015] The lower rod head is used for opening and closing the lower cavity, and the channel 1 is connected to the lower cavity.

[0016] The piston body is provided with a sealing ring on the annular surface.

[0017] The cross section of the piston body is larger than the cross section of the central hole.

[0018] The piston body is used to close the second channel.

[0019] In operation, the present invention provides a channel 1 and a channel 2 on both sides of the valve body, wherein the channel 1 is connected to the high-pressure hydraulic oil and the channel 2 is connected to the oil cylinder; a reverse check valve, a two-way sealing piston and a fusible plug are arranged in sequence from top to bottom in the middle hole of the valve body.

[0020] The hydraulic oil circuit is separated from the external air channel by a two-way sealing piston, achieving a self-sealing effect; it can automatically melt at high temperatures, allowing high-pressure hydraulic oil to automatically enter the cylinder to perform a safety function.

[0021] The invention is convenient to process and reliable to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention,

[0023] Figure 2 It is a schematic diagram of the action of the present invention,

[0024] Figure 3 It is a structural schematic diagram of a reverse check valve;

[0025] In the figure, 1 is the valve body, 11 is channel 1, 12 is channel 2, and 13 is the middle hole.

[0026] 2 is a reverse one-way valve, 21 is a chamber, 211 is an upper chamber, 212 is a middle chamber, 213 is a lower chamber, 22 is a valve core, 221 is a rod body, 222 is an upper rod head, 223 is a lower rod head, 23 is a one-way valve body, 24 is a spring,

[0027] 3 is a two-way sealing piston, 31 is a piston body, 32 is an upper rod, 33 is a lower rod,

[0028] 4 is a fusible plug, 41 is a fusible body, 42 is a center hole, 43 is an annular groove, and 5 is a sealing ring. DETAILED DESCRIPTION

[0029] The present invention Figure 1-3 As shown, it comprises a valve body 1, a reverse one-way valve 2, a two-way sealing piston 3 and a fusible plug 4. A channel 11 is provided at the upper part of one end of the valve body 1, and a channel 2 12 is provided at the middle part of the other end. A middle hole 13 is provided in the middle of the valve body, and the channel 1 and the channel 2 are respectively connected to the middle hole;

[0030] The reverse check valve 2 is arranged at the top end of the middle hole, the fusible plug 4 is arranged at the bottom end of the middle hole, and the passage 1 is connected to the chamber 21 of the reverse check valve; in case of fire, high pressure oil enters the chamber, thereby pushing the valve core;

[0031] The bidirectional sealing piston 3 is movably arranged in the middle hole and is located between the reverse one-way valve and the fusible plug. The bidirectional sealing piston is used to seal the middle hole.

[0032] In operation, the present invention provides a channel 1 and a channel 2 on both sides of the valve body, wherein the channel 1 is connected to the high-pressure hydraulic oil and the channel 2 is connected to the oil cylinder; a reverse check valve, a two-way sealing piston and a fusible plug are arranged in sequence from top to bottom in the middle hole of the valve body.

[0033] Under normal conditions, the hydraulic oil circuit and the external air channel are isolated by a two-way sealing piston, achieving self-sealing effect; it can automatically melt at high temperatures, allowing high-pressure hydraulic oil to automatically enter the cylinder to perform safety functions.

[0034] like Figure 2 As shown in the figure, in the event of a fire, the fusible material in the fusible plug melts, and the high-pressure hydraulic oil passes through the reverse one-way valve and pushes the two-way sealing piston to move toward the fusible plug. Due to the sealing effect of the two-way sealing piston, the high-pressure hydraulic oil will not flow out of the valve body and can only enter the cylinder and push the cylinder to perform the specified safety action, thereby realizing the function of the electro-hydraulic actuator to automatically perform safety actions in a fire environment. The arrow in the figure represents the flow direction of the high-pressure hydraulic oil.

[0035] The bidirectional sealing piston 3 includes a piston body 31, an upper rod 32 is provided on the top of the piston body, and a lower rod 33 is provided on the bottom. When a fusible body is provided in the fusible plug, the upper rod is used to contact the valve core 22 in the reverse one-way valve, and the lower rod is used to contact the fusible body 41.

[0036] In this way, in the sealed state, the upper rod is used to contact the valve core in the reverse one-way valve (ie, contact the lower rod head), and the lower rod is used to contact the fusible body.

[0037] A central hole 42 is provided in the middle of the fusible plug 4 , an annular groove 43 is provided in the middle of the central hole, and the fusible body is located in the central hole and the annular groove.

[0038] In this way, the tightness of the filled fusible body is improved, which is convenient and reliable. The fusible body can be selected from materials with corresponding melting temperatures according to actual working conditions.

[0039] The fusible plug 4 is connected in the middle hole by threads.

[0040] By adjusting the screw-in depth of the thread, the force of the two-way sealing piston on the reverse one-way valve is ensured, thereby ensuring that the reverse one-way valve can seal the high-pressure hydraulic oil and prevent the high-pressure hydraulic oil from entering the cylinder under accident-free conditions, thus avoiding the problem of the cylinder being unable to stay in place due to leakage of the reverse one-way valve under normal circumstances.

[0041] The reverse one-way valve comprises a one-way valve body 23, the chamber 21 is located in the middle of the one-way valve body 23, and the chamber comprises an upper chamber 211, a middle chamber 212 and a lower chamber 213 which are connected from top to bottom.

[0042] The valve core 22 includes a rod body 221, which is adaptively arranged in the middle cavity, and an upper rod head 222 is arranged on the top of the rod body and a lower rod head 223 is arranged on the bottom of the rod body.

[0043] The cross-sections of the upper rod head 222 and the lower rod head 223 are both larger than the cross-section of the middle cavity. The upper rod head 222 is located in the upper cavity 211, and the lower rod head 223 is located in the lower cavity 213.

[0044] A spring 24 is sleeved on the rod body below the upper rod head, and the spring is located in the upper cavity;

[0045] The lower rod head 223 is used to open and close the lower cavity, and the channel 11 is connected to the lower cavity 213.

[0046] An upper chamber, a middle chamber and a lower chamber are connected in the one-way valve body to facilitate the placement of the upper rod head, the rod body and the lower rod head of the valve core. A spring is also provided under the upper rod head to facilitate the resetting of the valve core. Channel one is connected to the lower chamber to facilitate pushing the lower rod head and then driving the valve core to move, thereby realizing the oil inlet action, which is convenient and reliable.

[0047] In the application of the one-way valve body, the center hole can be connected by threads for easy disassembly and assembly.

[0048] The piston body is provided with a sealing ring 5 on the annular surface.

[0049] In this way, the sealing performance of the middle hole is improved by providing a sealing ring.

[0050] The cross section of the piston body 4 is larger than the cross section of the center hole 42. In this way, after the fusible body melts, the lower rod extends into the center hole, and the piston body can be reliably positioned on the fusible plug to avoid falling from the center hole, thereby preventing the hydraulic oil from leaking.

[0051] The piston body 31 is used to close the second channel 12. In this way, under normal conditions, the piston body can be used to close the second channel, and cooperate with the reverse one-way valve to further achieve the disconnection between the first channel and the second channel. When a fire occurs, the piston body moves to achieve the connection between the first channel and the second channel.

[0052] The present invention realizes complete isolation of hydraulic oil from the outside air, thereby preventing the expansion of fire caused by leakage of hydraulic oil; the material of the fusible material in the fusible plug can be replaced according to different requirements of users to achieve automatic resetting requirements at different temperatures; the fusible plug and the piston are adjustable, thereby ensuring that the force acting on the valve core of the reverse one-way valve is adjustable, ensuring that the force acting on the valve core of the reverse one-way valve can be adjusted with the pressure, and improving the service life of the reverse one-way valve.

[0053] Regarding the contents disclosed in this case, there are a few points that need to be explained:

[0054] (1) The drawings of the embodiments disclosed in this case only involve the structures involved in the embodiments disclosed in this case. Other structures can refer to the general design;

[0055] (2) In the absence of conflict, the embodiments and features of the embodiments disclosed in this case may be combined with each other to obtain new embodiments;

[0056] The above are only specific implementation methods disclosed in this case, but the protection scope of the present disclosure is not limited thereto. The protection scope disclosed in this case should be based on the protection scope of the claims.

Claims

1. A fuse device for a fireproof electro-hydraulic actuator, characterized in that: It includes a valve body, a reverse one-way valve, a two-way sealing piston and a fusible plug, wherein the upper part of one end of the valve body is provided with a channel 1, the middle part of the other end is provided with a channel 2, the middle of the valve body is provided with a middle hole, and the channel 1 and the channel 2 are respectively connected to the middle hole; The reverse check valve is arranged at the top end of the middle hole, the fusible plug is arranged at the bottom end of the middle hole, and the channel 1 is connected to the chamber of the reverse check valve; The bidirectional sealing piston is movably arranged in the middle hole and is located between the reverse one-way valve and the fusible plug; The bidirectional sealing piston comprises a piston body, an upper rod is provided on the top of the piston body, and a lower rod is provided on the bottom of the piston body. When a fusible body is provided in the fusible plug, the upper rod is used to contact the valve core in the reverse one-way valve, and the lower rod is used to contact the fusible body. The piston body is used to close the second channel; Channel 1 is connected to high-pressure hydraulic oil, and channel 2 is connected to the oil cylinder; Under normal conditions, the hydraulic oil circuit is isolated from the external air channel by a two-way sealing piston; under high temperature, high-pressure hydraulic oil automatically enters the cylinder.

2. A fuse device for a fireproof electro-hydraulic actuator according to claim 1, characterized in that: A central hole is arranged in the middle of the fusible plug, an annular groove is arranged in the middle of the central hole, and the fusible body is located in the central hole and the annular groove.

3. A fuse device for a fireproof electro-hydraulic actuator according to claim 1 or 2, characterized in that: The fusible plug is connected in the middle hole by threads.

4. A fuse device for a fireproof electro-hydraulic actuator according to claim 1, characterized in that: The reverse one-way valve comprises a one-way valve body, the chamber is located in the middle of the one-way valve body, and the chamber comprises an upper chamber, a middle chamber and a lower chamber connected from top to bottom. The valve core comprises a rod body, which is adaptively arranged in the middle cavity, and an upper rod head is arranged on the top of the rod body and a lower rod head is arranged on the bottom of the rod body. The cross sections of the upper rod head and the lower rod head are both larger than the cross section of the middle cavity. The upper rod head is located in the upper cavity, and the lower rod head is located in the lower cavity. A spring is sleeved on the rod body below the upper rod head, and the spring is located in the upper cavity; The lower rod head is used for opening and closing the lower cavity, and the channel 1 is connected to the lower cavity.

5. A fuse device for a fireproof electro-hydraulic actuator according to claim 1, characterized in that: The piston body is provided with a sealing ring on the annular surface.

6. A fuse device for a fireproof electro-hydraulic actuator according to claim 1, characterized in that: The cross section of the piston body is larger than the cross section of the central hole.

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