Automatic pressure relief microwave digestion vessel

Abstract

An automatic pressure relief microwave digestion tank, comprising a tank body, a tank cover is arranged on the tank body, a first pressure relief channel is arranged in the tank cover in the axial direction, a pressure relief fixing seat is arranged on the tank cover, a pressure relief valve core is arranged in the pressure relief fixing seat in the axial direction, a plug is fixedly connected to the lower end of the pressure relief valve core, the plug blocks the first pressure relief channel, a second pressure relief channel is arranged in the pressure relief valve core in the axial direction, and a spring is arranged between the plug and the pressure relief fixing seat. When the pressure in the tank body increases to a certain pressure value, the pressure on the plug is greater than the elastic force of the spring, the plug and the pressure relief valve core move upward, the spring is compressed, the contact surface of the plug and the first pressure relief channel is separated, the first pressure relief channel and the second pressure relief channel are communicated, and the gas is sprayed out in sequence through the first pressure relief channel and the second pressure relief channel. The pressure relief point is stable, convenient to use, and other parts are not damaged after pressure relief.

Description

Technical Field

[0001] This utility model relates to the field of physics, and more particularly to microwave digestion technology, specifically an automatic pressure relief microwave digestion vessel. Background Technology

[0002] Microwave digestion systems are widely used in sample pretreatment. However, during the digestion of certain samples, the pressure inside the microwave digestion vessel can be high, which can reduce the vessel's lifespan or even cause it to burst. To eliminate these risks, self-releasing digestion vessels have emerged in recent years. These vessels typically use a safety relief plate to control the pressure inside. In the event of overpressure, the safety relief plate breaks, separating the vessel lid from the digestion vessel and releasing the internal pressure, thus preventing the vessel from stretching or bursting. This pressure relief method has the following drawbacks. First, it requires the safety relief plate to have an accurate break point. If the break points of the safety relief plates are inconsistent, the digestion vessel may depressurize prematurely, leading to sample loss, or fail to depressurize at all, posing a risk of explosion. Accurate break points require high processing precision for the safety relief plate. Second, most safety relief plates are made of plastic, which will break after pressure relief and will also damage the skirt of the vessel lid, requiring replacement of both the safety relief plate and the vessel lid, increasing after-sales maintenance costs. Third, the breakage of the safety relief plate will lead to the failure of the entire experiment, resulting in a high risk of experimental failure. Utility Model Content

[0003] The purpose of this invention is to provide an automatic pressure relief microwave digestion vessel to solve the technical problems of inconsistent fracture points, damage to parts after pressure relief, and high risk of experimental failure in existing self-pressure relief digestion vessels.

[0004] This utility model provides an automatic pressure-relief microwave digestion vessel, including a vessel body, a vessel cover, a first pressure relief channel arranged axially in the vessel cover, a pressure relief fixing seat arranged on the vessel cover, the pressure relief fixing seat being fixedly connected to the vessel body, a pressure relief valve core passing through the pressure relief fixing seat axially, the pressure relief valve core and the pressure relief fixing seat forming an axial sliding pair, a plug being fixedly connected to the lower end of the pressure relief valve core, the plug being located on the lower side of the pressure relief fixing seat and sealing the first pressure relief channel, the upper end of the pressure relief valve core extending axially to the upper side of the pressure relief fixing seat, a second pressure relief channel arranged axially in the pressure relief valve core, the second pressure relief channel extending downward from the upper end of the pressure relief valve core and penetrating to the side of the plug, a spring being arranged between the plug and the pressure relief fixing seat, the spring biasing the plug downward.

[0005] Furthermore, it also includes a tank rack, in which the tank body is fixedly installed, and a pressure relief fixing seat is fixedly connected to the upper end of the tank rack.

[0006] Furthermore, a sealing sleeve is connected to the lower side of the pressure relief fixing seat, the lower end of the sealing sleeve is connected to the tank cover, the plug is located in the sealing sleeve, and an annular sealing soft structure is connected between the outer side of the upper end of the plug and the inner wall of the sealing sleeve.

[0007] Furthermore, the side of the plug is a conical surface or a cylindrical surface.

[0008] Furthermore, the spring is made of a metallic material.

[0009] Furthermore, the pressure relief fixing seat is provided with a cavity, the pressure relief valve core passes through the cavity of the pressure relief fixing seat, the spring is disposed in the cavity of the pressure relief fixing seat and sleeved on the outside of the pressure relief valve core, a steel sleeve is sleeved on the outside of the spring in the cavity of the pressure relief fixing seat, and an end cap is provided on the upper side of the spring. The end cap is fixedly connected to the steel sleeve and the pressure relief fixing seat. A push rod is provided between the spring and the plug, the push rod is sleeved on the outside of the pressure relief valve core, and a limiting block is sleeved on the outside of the push rod. The limiting block is fixedly connected to the pressure relief fixing seat.

[0010] Furthermore, a protective cover is fitted on the upper side of the pressure relief fixing seat on the outside of the pressure relief valve core.

[0011] Furthermore, a sealing ring is provided between the upper end of the pressure relief valve core and the pressure relief fixing seat.

[0012] Compared with existing technologies, this invention offers significant and positive advantages. When the pressure inside the tank increases to a certain value, causing the pressure on the plug to exceed the spring force, the plug and pressure relief valve core move upwards, compressing the spring and causing the plug to disengage from the contact surface of the first pressure relief channel. This connects the first and second pressure relief channels, allowing gas to be ejected sequentially through both channels. This invention provides a stable pressure relief point, is easy to use, does not damage other parts after pressure relief, has low maintenance costs, and allows for resealing of the digestion tank via spring reset after the pressure inside the tank decreases, thereby reducing experimental risks. Attached Figure Description

[0013] Figure 1 This is a cross-sectional schematic diagram of an automatic pressure-relief microwave digestion vessel according to the present invention.

[0014] Figure 2 for Figure 1 A magnified view of a portion of the image. Detailed Implementation

[0015] The present invention will be further described below with reference to embodiments, but the present invention is not limited to these embodiments. Any similar variations using the present invention should be included within the protection scope of the present invention. The use of directions such as up, down, front, back, left, right, center, inside, and outside in the present invention is only for the convenience of clear description and is not intended to limit the technical solution of the present invention.

[0016] like Figures 1-2 As shown, this utility model provides an automatic pressure relief microwave digestion vessel, including a vessel body 1, a vessel cover 2 on the vessel body 1, a first pressure relief channel 3 arranged axially in the vessel cover 2, a pressure relief fixing seat 4 on the vessel cover 2, the pressure relief fixing seat 4 being fixedly connected to the vessel body 1, a pressure relief valve core 5 passing through the pressure relief fixing seat 4 axially, the pressure relief valve core 5 and the pressure relief fixing seat 4 forming an axial sliding pair, a plug 6 being fixedly connected to the lower end of the pressure relief valve core 5, the plug 6 being located on the lower side of the pressure relief fixing seat 4 and sealing the first pressure relief channel 3, the upper end of the pressure relief valve core 5 extending axially to the upper side of the pressure relief fixing seat 4, a second pressure relief channel 7 arranged axially in the pressure relief valve core 5, the second pressure relief channel 7 extending downward from the upper end of the pressure relief valve core 5 and penetrating to the side of the plug 6, a spring 8 being arranged between the plug 6 and the pressure relief fixing seat 4, the spring 8 biasing the plug 6 downward.

[0017] The lid 2 is used to seal the tank 1. During the digestion experiment, the gas pressure inside the tank 1 is transmitted to the plug 6 through the first pressure relief channel 3 on the lid 2. When the pressure inside the tank 1 increases to a certain value, causing the pressure on the plug 6 to exceed the elastic force of the spring 8, the plug 6 and the pressure relief valve core 5 move upward, the spring 8 compresses, causing the plug 6 to disengage from the contact surface of the first pressure relief channel 3, and the first pressure relief channel 3 and the second pressure relief channel 7 connect. Gas is then ejected through the first pressure relief channel 3 and the second pressure relief channel 7 in sequence to release pressure. After pressure relief, the pressure inside the tank 1 decreases, the spring 8 returns to its original position, pushing the plug 6 and the pressure relief valve core 5 downward, and the plug 6 seals the first pressure relief channel 7. The pressure threshold for pressure relief of the digestion tank can be adjusted by adjusting the stiffness or compression of the spring 8.

[0018] The pressure relief point of this invention is stable and easy to use. It will not damage other parts after pressure relief, and the maintenance cost is low. Furthermore, after the pressure in the tank 1 decreases, the digestion tank can be resealed by the spring 8, thereby reducing experimental risks.

[0019] Furthermore, it also includes a tank rack 9, in which the tank body 1 is fixedly installed, and the pressure relief fixing seat 4 is fixedly connected to the upper end of the tank rack 9.

[0020] Furthermore, a sealing sleeve 10 is connected to the lower side of the pressure relief fixing seat 4. The lower end of the sealing sleeve 10 is connected to the tank cover 2. The plug 6 is located in the sealing sleeve 10. An annular sealing soft structure 11 is connected between the outer side of the upper end of the plug 6 and the inner wall of the sealing sleeve 10. The annular sealing soft structure 11 and the sealing sleeve 10 are used to prevent corrosive gas from entering the inner cavity of the pressure relief fixing seat 4 and corroding the spring 8 during pressure relief. The annular sealing soft structure 11 is a soft structure to facilitate the up and down movement of the plug 6 and can be made of polytetrafluoroethylene (PTFE).

[0021] Furthermore, the side surface of the plug 6 is a conical surface or a cylindrical surface.

[0022] Furthermore, the spring 8 is made of metal, which is not affected by the plastic deformation of elastic materials, and the pressure relief point is more stable.

[0023] Furthermore, the pressure relief fixing seat 4 is provided with a cavity, the pressure relief valve core 5 passes through the cavity of the pressure relief fixing seat 4, the spring 8 is disposed in the cavity of the pressure relief fixing seat 4 and sleeved on the outside of the pressure relief valve core 5, a steel sleeve 12 is sleeved on the outside of the spring 8 in the cavity of the pressure relief fixing seat 4 and an end cap 13 is provided on the upper side of the spring 8, the end cap 13 is fixedly connected to the steel sleeve 12 and the pressure relief fixing seat 4, a push rod 14 is provided between the spring 8 and the plug 6, the push rod 14 is sleeved on the outside of the pressure relief valve core 5, a limiting block 15 is sleeved on the outside of the push rod 14, and the limiting block 15 is fixedly connected to the pressure relief fixing seat 4.

[0024] Spring 8 is made of metal and has a spiral structure, making it prone to arcing in microwave environments. End cap 13 and steel sleeve 12 are both made of metal and are interference-fitted. When assembled, end cap 13 and steel sleeve 12 form a cutoff waveguide that encloses spring 8 within steel sleeve 12, preventing microwaves from entering steel sleeve 12 and thus solving the arcing problem of spring 8.

[0025] Furthermore, a protective cover 16 is fitted on the upper side of the pressure relief fixing seat 4 on the outside of the pressure relief valve core 5 to prevent the spring 8 from being corroded.

[0026] Furthermore, a sealing ring 17 is provided between the upper end of the pressure relief valve core 5 and the pressure relief fixing seat 4.

Claims

1. An automatic pressure-relief microwave digestion vessel, comprising a vessel body, wherein a lid is provided on the vessel body, characterized in that, A first pressure relief channel is provided axially in the tank cover. A pressure relief fixing seat is provided on the tank cover and is fixedly connected to the tank body. A pressure relief valve core is inserted axially in the pressure relief fixing seat. The pressure relief valve core and the pressure relief fixing seat form an axial sliding pair. A plug is fixedly connected to the lower end of the pressure relief valve core. The plug is located on the lower side of the pressure relief fixing seat and seals the first pressure relief channel. The upper end of the pressure relief valve core extends axially to the upper side of the pressure relief fixing seat. A second pressure relief channel is provided axially in the pressure relief valve core. The second pressure relief channel extends downward from the upper end of the pressure relief valve core and passes through the side of the plug. A spring is provided between the plug and the pressure relief fixing seat. The spring biases the plug downward.

2. The automatic pressure-relief microwave digestion vessel according to claim 1, characterized in that, It also includes a tank rack, in which the tank body is fixedly installed, and a pressure relief fixing seat is fixedly connected to the upper end of the tank rack.

3. The automatic pressure-relief microwave digestion vessel according to claim 1, characterized in that, The lower side of the pressure relief fixing seat is connected to a sealing sleeve, the lower end of the sealing sleeve is connected to the tank cover, the plug is located in the sealing sleeve, and an annular sealing soft structure is connected between the outer side of the upper end of the plug and the inner wall of the sealing sleeve.

4. The automatic pressure-relief microwave digestion vessel according to claim 1, characterized in that, The side of the plug is a conical surface or a cylindrical surface.

5. The automatic pressure-relief microwave digestion vessel according to claim 1, characterized in that, The spring is made of metal.

6. The automatic pressure-relief microwave digestion vessel according to claim 5, characterized in that, The pressure relief fixing seat has a cavity, the pressure relief valve core passes through the cavity of the pressure relief fixing seat, the spring is set in the cavity of the pressure relief fixing seat and sleeved on the outside of the pressure relief valve core, a steel sleeve is sleeved on the outside of the spring in the cavity of the pressure relief fixing seat, and an end cap is set on the upper side of the spring. The end cap is fixedly connected to the steel sleeve and the pressure relief fixing seat. A push rod is set between the spring and the plug. The push rod is sleeved on the outside of the pressure relief valve core, and a limiting block is sleeved on the outside of the push rod. The limiting block is fixedly connected to the pressure relief fixing seat.

7. The automatic pressure-relief microwave digestion vessel according to claim 1, characterized in that, The upper side of the pressure relief fixing seat is fitted with a protective cover on the outside of the pressure relief valve core.

8. The automatic pressure-relief microwave digestion vessel according to claim 1, characterized in that, A sealing ring is provided between the upper end of the pressure relief valve core and the pressure relief fixing seat.

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