CN112943993B

CN112943993B - Cylindrical pressure relief device

Info

Publication number: CN112943993B
Application number: CN202110293505.1A
Authority: CN
Inventors: 李曜; 李兵; 闫泽; 莫继学; 刘申; 唐灵奇
Original assignee: Shenzhen Graduate School Harbin Institute of Technology
Current assignee: Shenzhen Graduate School Harbin Institute of Technology
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2022-12-30
Anticipated expiration: 2041-03-18
Also published as: CN112943993A

Abstract

The invention provides a cylindrical pressure relief device, which comprises a high-pressure tank body, a valve mechanism and an SMA control mechanism, wherein the valve mechanism comprises a valve body, a valve core, a spring, a rubber plug and a sealing cap; the valve body is arranged on the high-pressure tank body and is connected with the high-pressure tank body in a sealing way, a channel is formed in the valve body, the inlet end of the channel is communicated with the inside of the high-pressure tank body, and the outlet end of the channel is communicated with the outside; the valve core penetrates through the channel, the spring is sleeved on the valve core, the connecting end of the valve core penetrates out of the channel and is positioned in the high-pressure tank body, and the fixed end of the valve core can move towards the connecting end of the valve core to compress the spring; a connecting hole is formed in the connecting end of the valve core; the sealing cap is arranged at the connecting end of the valve core, the rubber plug is arranged on the sealing cap, the connecting end of the valve core penetrates out of the rubber plug and is connected to the sealing cap, the valve core and the rubber plug are in sealing fit, and the rubber plug can be inserted into the channel from the inlet end of the channel and seals the channel; the invention has the advantages of small volume and high integration level.

Description

Cylindrical pressure relief device

Technical Field

The invention relates to a pressure relief device for controlling the on-off of gas between high-pressure tank bodies through a circuit, in particular to a cylindrical pressure relief device.

Background

The electromagnetic valve is an industrial device controlled by electromagnetism, is an automatic basic element for controlling fluid flow, belongs to an actuator, is not limited to hydraulic pressure and pneumatics, and is used for adjusting the direction, the flow rate, the speed and other parameters of a medium in an industrial control system.

The solenoid valve can be matched with different circuits to realize expected control, and the control precision and flexibility can be ensured. There are many types of solenoid valves, with different solenoid valves functioning at different locations in the control system. The electromagnetic valve is normally open and normally closed, a valve core (piston plug) of the normally open electromagnetic valve is opened when the electromagnetic coil is electrified, and a valve core (piston plug) of the normally closed electromagnetic valve is opened when the electromagnetic coil is electrified, so that the state of the valve core (piston plug) after the position is changed needs to be kept, and a coil needs to be continuously electrified; the opening and the resetting of the traditional electromagnetic valve are realized by the elasticity of a spring, but the force of the spring is nonlinear, and the opening and the closing speeds of a valve core (a piston plug) are relatively slow due to the addition of other external factors, so that the opening and the closing speeds of the valve core are difficult to meet the requirements on some precise equipment.

The electromagnetic valves attract the valve bodies to move by electrifying the electromagnets so as to control the on-off of the pipelines, and all the electromagnetic valves need to be provided with electromagnets with relatively large volumes based on the characteristics of the electromagnetic valves, so that the electromagnetic valves occupy physical space and cannot be suitable for working in a high-pressure tank body with high requirement on air tightness, and particularly, an electrifying loop of the traditional electromagnetic valve is complex; in addition, because the working environment is a high-pressure environment, the transmission electromagnetic valve cannot provide large acting force required when the transmission electromagnetic valve is opened.

Shape Memory Alloy (SMA) materials can be used as actuators because of their shape memory effect, SMA actuators have the advantages of simple structure, large driving force, high power to weight ratio, rapid response, etc., and have found a great number of applications in practice, particularly in aircraft wing variant structures.

Based on the above, the invention provides a pressure relief device for performing pressure relief on a high-pressure gas tank based on SMA electrification control.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a cylindrical pressure relief device which has the advantages of small volume and high integration level.

In order to achieve the above object, the present invention provides a cylindrical pressure relief device, comprising:

a high pressure tank body;

a valve mechanism capable of performing pressure relief of the high-pressure tank body;

and

the SMA control mechanism can control the valve mechanism to act so as to release the pressure of the high-pressure tank body;

the valve mechanism comprises a valve body, a valve core, a spring, a rubber plug and a sealing cap;

the valve body is arranged on the high-pressure tank body and is connected with the high-pressure tank body in a sealing way, a channel is formed in the valve body, the inlet end of the channel is communicated with the inside of the high-pressure tank body, and the outlet end of the channel is communicated with the outside;

the valve core penetrates through the channel, the spring is sleeved on the valve core, the connecting end of the valve core penetrates out of the channel and is positioned in the high-pressure tank body, and the fixed end of the valve core can move towards the connecting end of the valve core to compress the spring;

a connecting hole is formed in the connecting end of the valve core;

the sealing cap is arranged at the connecting end of the valve core, the rubber plug is arranged on the sealing cap, the connecting end of the valve core penetrates out of the rubber plug and is connected to the sealing cap, the valve core and the rubber plug are in sealing fit, and the rubber plug can be inserted into the channel from the inlet end of the channel and seals the channel;

wherein SMA control mechanism is located the pressure tank internally, and it includes SMA wire, fixed plate and bracing piece, and the fixed plate passes through the bracing piece and connects and support on the valve body, and the one end of SMA wire is connected on the fixed plate, and the other end passes connecting hole back connection on the fixed plate, and the control is carried out the shrink of SMA wire taut to the circular telegram of SMA wire, and the pulling case drives the rubber buffer and removes in order to open the passageway.

According to another embodiment of the invention, the passage has a stepped shape with a connecting wall located in a direction non-parallel to a center line of the passage, the valve core has a drum portion at a middle portion thereof, and both ends of the spring abut against the drum portion and the connecting wall, respectively.

According to another embodiment of the invention, the spring is a conical spring with a large end and a small end.

According to another embodiment of the invention, the fixed end of the valve core is provided with a guide sheet/plate for keeping the position of the central line of the valve core unchanged, and a plurality of guide sheets/plates are distributed in an array by taking the central line of the valve core as the center.

According to another embodiment of the invention, at least one sealing ring is arranged at the joint of the valve body and the high-pressure tank body.

According to another embodiment of the invention, the rubber stopper has a conical portion which can be inserted into the channel and a cylindrical portion which can close the channel, the cylindrical portion being connected to the sealing cap.

According to another specific embodiment of the present invention, the SMA control mechanism further includes two conductive plates and two conductive columns, the conductive columns are connected to the high-voltage tank, and the conductive plates are connected to the conductive columns and the ends of the SMA wires.

According to another specific embodiment of the present invention, the SMA control mechanism further includes two half-moon plates, the two half-moon plates are not in contact with each other, and the two conductive plates are respectively connected to the different conductive pillars through different half-moon plates.

According to another embodiment of the present invention, the conductive sheet is a copper conductive sheet, the conductive post is a copper bolt, and the half-moon plate is a copper plate.

The invention has the following beneficial effects:

the pressure relief device is integrally a cylindrical mechanism, has small volume, can be suitable for pressure relief operation under small volume (micro size), has the advantages of compact structure and high integration level, can be directly connected with a pipeline through threads, has more stable structure, and can perform pressure relief under specific conditions.

The present invention will be described in further detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic view of the overall structure of the pressure relief device of the present invention;

FIG. 2 is a schematic view of the internal structure of the pressure relief device of the present invention;

FIG. 3 is a schematic diagram showing an SMA control mechanism in a pressure relief device of the present invention;

fig. 4 is a schematic view, partially in cross-section, of a pressure relief device of the present invention.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention, taken in conjunction with the accompanying drawings and detailed description, is set forth below. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

Example 1

The present embodiment provides a cylindrical pressure relief device, as shown in fig. 1-4, comprising a high pressure tank 10, a valve mechanism 20, and an SMA control mechanism 30.

The valve mechanism 20 comprises a valve body 21, a valve core 22, a spring 23, a rubber plug 24 and a sealing cap 25;

the valve body 21 is arranged on the high-pressure tank 10 and is connected with the high-pressure tank 10 in a sealing manner, at least one sealing ring 11, for example, two sealing rings 11, are arranged at the joint of the valve body 21 and the high-pressure tank 10, specifically, the valve body 21 is matched with the high-pressure tank 10 through threads, and the sealing rings 11 can be used for limiting threaded engagement and can also be used for forming sealing after the threads on the valve body 21 are engaged with the threads on the high-pressure tank 10; a channel 26 is formed in the valve body 21, the inlet end of the channel is communicated with the inside of the high-pressure tank body 10, and the outlet end of the channel 26 is communicated with the outside;

the valve core 22 penetrates through the channel 26, the spring 23 is sleeved on the valve core 22, the connecting end of the valve core 22 penetrates out of the channel 26 and is positioned in the high-pressure tank 10, and the fixed end of the valve core 22 can displace towards the connecting end to compress the spring 23;

a connecting hole 27 is arranged at the connecting end of the valve core 22;

further, the passage 26 has a stepped shape, a connecting wall 28 is provided in the passage 26 in a direction non-parallel to the center line of the passage 26, a drum 29 is provided in the middle of the spool 22, and both ends of the spring 23 abut against the drum 29 and the connecting wall 28, respectively.

Still further, the spring 23 is a conical spring 23 with a large end and a small end.

The sealing cap 25 is arranged on the connecting end of the valve core 22, the rubber plug 24 is arranged on the sealing cap 25, the connecting end of the valve core 22 penetrates out of the rubber plug 24 and is connected to the sealing cap 25, the valve core 22 and the rubber plug 24 are in sealing fit, and the rubber plug 24 can be inserted into the channel 26 from the inlet end of the channel 26 and close the channel 26;

wherein the rubber stopper 24 has a tapered portion 241 capable of being inserted into the passage 26 and a cylindrical portion 242 capable of closing the passage 26, the cylindrical portion 242 being connected with the sealing cap 25.

In the present embodiment, the fixed end of the valve core 22 is located outside the channel 26, and the fixed end of the valve core 22 is provided with a plurality of guide pieces/plates 221 arranged along the central line direction of the valve core 22, so as to ensure that the central line position of the valve core 22 does not change in the sliding process, i.e. the valve core slides linearly.

The SMA control mechanism 30 is located in the high-pressure tank 10, and includes an SMA wire 31, a fixing plate 32 and three support rods 33, the fixing plate 32 is connected to and supported on the valve body 21 through the support rods 33, one end of the SMA wire 31 is connected to the fixing plate 32, the other end of the SMA wire 31 passes through the connecting hole 27 and then is connected to the fixing plate 32, the SMA wire 31 is controlled to be electrified to contract and tighten the SMA wire 31, and the valve core 22 is pulled to drive the rubber plug 24 to move to open the channel 26.

Specifically, the SMA control mechanism 30 further includes two conductive sheets 34, two conductive columns 35, and two half-moon plates 36, wherein the two half-moon plates 36 form a circular ring, and the two half-moon plates 36 are not in contact with each other to form a set with the

conductive sheets

34 and 35 and form a passage, the conductive sheets 34 are copper conductive sheets 34, the conductive columns 35 are copper bolts, and the half-moon plates 36 are copper plates.

The conducting column 35 is connected to the high-voltage tank 10, the meniscus 36 is supported in the high-voltage tank 10 through the conducting column 35, and the conducting sheet 34 is connected with the meniscus 36 and the end part of the SMA wire 31.

The high-pressure tank 10 in this embodiment is provided with an inlet 12, and is communicated with an external device through the inlet 12 to perform pressure relief on-off control.

In this embodiment, the SMA wire 31 is energized through the conductive post 35, the meniscus 36 and the conductive sheet 34 (the current corresponding to different wire diameters is different, for example, the SMA wire 31 with a wire diameter of 0.3mm, the current is set to 1.5A, adaptive design and adjustment can be performed according to specific requirements), the SMA wire 31 is energized to generate heat and heat, and is contracted and tensioned to generate tensile force, the sealing cap 25 and the valve element 22 are pulled to move toward the high-pressure tank 10, and the rubber plug 24 is pulled by the moving sealing cap 25 and the valve element 22 to open the inlet of the passage 26, so as to achieve the purpose of pressure relief.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that changes may be made without departing from the scope of the invention, and it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Claims

1. A cylindrical pressure relief device, comprising:

a cylindrical high-pressure tank;

a valve mechanism capable of performing pressure relief of the high-pressure tank;

and

a connecting hole is formed in the connecting end of the valve core;

the sealing cap is arranged at the connecting end of the valve core, the rubber plug is arranged on the sealing cap, the connecting end of the valve core penetrates out of the rubber plug and is connected to the sealing cap, the valve core is in sealing fit with the rubber plug, and the rubber plug can be inserted into the channel from the inlet end of the channel and seals the channel; the rubber plug is provided with a conical part which can be inserted into the channel and a cylindrical part which can close the channel, and the cylindrical part is connected with the sealing cap;

wherein SMA control mechanism is located the pressure tank is internal, and it includes SMA wire, fixed plate and bracing piece, the fixed plate passes through the bracing piece is connected and is supported on the valve body, the one end of SMA wire is connected on the fixed plate, the other end passes connect behind the connecting hole on the fixed plate, control is right the circular telegram of SMA wire goes on the shrink of SMA wire is taut, the pulling the case drives the rubber buffer removes in order to open the passageway.

2. The cylindrical pressure relief device of claim 1, wherein the passage is stepped with a connecting wall in a direction non-parallel to a center line of the passage, the valve spool has a drum in a middle portion thereof, and both ends of the spring abut against the drum and the connecting wall, respectively.

3. The cylindrical pressure relief device of claim 2, wherein the spring is a conical spring with a large end and a small end.

4. The cylindrical pressure relief device according to claim 2, wherein the fixed end of the spool is provided with a guide plate for maintaining the position of the center line of the spool, and a plurality of guide plates are arrayed around the center line of the spool.

5. The cylindrical pressure relief device of claim 1, wherein at least one sealing ring is provided at the junction of the valve body and the high pressure tank.

6. The column pressure relief device according to any of claims 1 to 5, wherein said SMA control mechanism further comprises two conductive pieces and two conductive posts, said conductive posts are connected to said high-voltage tank, and said conductive pieces are connected to said conductive posts and ends of said SMA wire.

7. The cylindrical pressure relief device according to claim 6, wherein said SMA control mechanism further comprises two half-moon plates, wherein said two half-moon plates are not in contact with each other, and said two conductive strips are connected to different conductive posts through different said half-moon plates, respectively.

8. The cylindrical pressure relief device according to claim 7, wherein said conductive piece is a copper conductive piece, said conductive post is a copper bolt, and said half-moon plate is a copper plate.