Microwave digestion tank

Abstract

The utility model relates to a microwave digestion tank which comprises an outer tank, an inner tank and a sealing plug, a spring plunger and a pressure relief block are sequentially arranged between the sealing plug and the inner tank, the spring plunger is arranged in the sealing plug, the pressure relief block is sleeved outside the inner tank, an inner tank cover is arranged between the pressure relief block and the inner tank, and the inner tank cover is sleeved outside the inner tank. An inner cone part is formed on the inner tank cover, and an outer cone part matched with the inner cone part is formed on the pressure relief block. The automatic pressure relief device effectively solves the problem of automatic pressure relief after the digestion tank reaches two megapascal, and is simple in structure and convenient to assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave digestion, in particular to a microwave digestion tank. Background Art

[0002] Microwave digestion method refers to an efficient sample pretreatment method that uses microwaves to heat the digestion solution (various acids, some alkali solutions and salts) and the sample in a closed digestion tank to quickly dissolve various samples under high temperature and high pressure conditions. It is widely used due to its advantages such as fast heating speed, uniform heating, small amount of reagents, low blank, energy saving and high efficiency, and easy automation.

[0003] At present, the digestion method of digestion tank on the market is to place the sample and reagent in the tank, and then perform microwave heating in the microwave digestion instrument. During the heating process, a chemical reaction occurs, causing the pressure and temperature inside the tank to continue to rise. When the pressure inside the tank reaches six MPa, it will automatically release the pressure. However, some samples can only be digested more fully under a specific low pressure of two MPa. Therefore, how to effectively solve the problem of automatic pressure release of the digestion tank after reaching two MPa is an important research topic. Utility Model Content

[0004] The purpose of the utility model is to provide a microwave digestion tank to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a microwave digestion tank, comprising an outer tank, an inner tank and a sealing plug, wherein a spring plunger and a pressure relief block are sequentially arranged between the sealing plug and the inner tank, the spring plunger is placed in the sealing plug, the pressure relief block is sleeved on the outside of the inner tank, an inner tank cover is arranged between the pressure relief block and the inner tank, an inner cone is formed on the inner tank cover, and an outer cone matching the inner cone is formed on the pressure relief block.

[0006] Optionally, a pressure conducting hole is formed on the inner tank cover, the lower opening of the pressure conducting hole faces the inner cavity of the inner tank, an internal pressure relief hole is provided above the pressure conducting hole, and the upper opening of the internal pressure relief hole is arranged on the upper cover surface of the inner tank cover.

[0007] Optionally, the pressure relief block comprises an upper block and a lower block, the diameter of the lower block is larger than that of the upper block, an external pressure relief hole is formed on the lower block near the upper block, and an exhaust hole is provided on the top of the upper block.

[0008] Preferably, the lower block is provided with an internal thread, and the inner tank is provided with an external thread matching the internal thread.

[0009] Preferably, the upper block and the lower block are integrally formed of plastic material.

[0010] Optionally, the lower end portion of the sealing plug abuts against the outer cone portion.

[0011] Optionally, the diameter of the pressure-conducting hole is smaller than the diameter of the internal pressure-relieving hole.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] It effectively solves the problem of automatic pressure relief after the digestion tank reaches 2 MPa, has a simple structure and is easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the explosion of the structure of the utility model;

[0015] Figure 2 for Figure 1 Structural schematic diagram of the middle pressure relief block;

[0016] Figure 3 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 4 for Figure 3 Schematic diagram of the structure of the middle inner tank cover;

[0018] Figure 5 for Figure 3 Schematic diagram of the structure of the middle pressure relief block. DETAILED DESCRIPTION

[0019] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0020] like Figures 1 to 5 As shown, a microwave digestion tank comprises an outer tank 6, an inner tank 5 and a sealing plug 1, wherein a spring plunger 2 and a pressure relief block 3 are sequentially arranged between the sealing plug 1 and the inner tank 5, wherein the spring plunger 2 is placed inside the sealing plug 1, and the pressure relief block 3 is sleeved outside the inner tank 5, and an inner tank cover 4 is arranged between the pressure relief block 3 and the inner tank 5, wherein an inner cone 303 is formed on the inner tank cover 4, and an outer cone 403 matching the inner cone 303 is formed on the pressure relief block 3. A pressure conducting hole 401 is formed on the inner tank cover 4, wherein the lower opening of the pressure conducting hole 401 faces the inner cavity of the inner tank 5, an inner pressure relief hole 402 is arranged above the pressure conducting hole 401, and the upper opening of the inner pressure relief hole 402 is arranged on the upper cover surface of the inner tank cover 4.

[0021] in, Figure 4 The inner cone and Figure 5The outer cones in the tank are machined to fit each other to achieve sealing of the digestion tank, so as to avoid the contact surface not fitting when the pressure is too high, resulting in uneven pressure release or early pressure release. The lower end surface of the sealing plug 1 abuts against the top surface of the spring plunger 2 to generate tension.

[0022] The diameter of the pressure-conducting hole 401 is smaller than the diameter of the inner pressure-releasing hole 402. The bottom of the pressure-conducting hole and the inner tank form a trumpet-shaped structure, and the pressurized gas in the inner tank can be easily gathered in the pressure-conducting hole. Since the diameter of the pressure-conducting hole is small, the pressure of the pressurized gas is further increased, so that it is easier to spray upward. When the pressurized gas enters the inner pressure-releasing hole, since the diameter of the inner pressure-releasing hole is larger than that of the pressure-conducting hole, the pressure of the pressurized gas will drop moderately, which can prevent the outer cone from generating excessive pressure and avoid pushing the sealing plug open.

[0023] In one embodiment, the pressure relief block 3 includes an upper block 31 and a lower block 32 , the diameter of the lower block 32 is larger than that of the upper block 31 , an external pressure relief hole 302 is formed on the lower block 32 near the upper block 31 , and an exhaust hole 301 is provided on the top of the upper block 31 .

[0024] Preferably, the lower block 32 is provided with an internal thread, and the inner tank 5 is provided with an external thread matching the internal thread. The upper block 31 and the lower block 32 can be integrally formed of plastic material. The pressure relief block and the inner tank are connected by threaded connection, which can fully ensure that the digestion tank will not leak gas, and at the same time make the connection between the two stable and will not loosen when the gas is deflated.

[0025] It should be noted that, because the liquid in the digestion tank is usually a strong acid or a strong base, only PFA (perfluoroalkoxy resin) or PTFE (polytetrafluoroethylene) can be used to make the inner tank. The outer tank is mostly made of PEEK (polyetheretherketone).

[0026] like Figure 5 As shown, the lower end of the sealing plug 1 abuts against the outer cone 403 .

[0027] Before use, install the spring plunger 2 into the sealing plug 1, and then press the sealing plug 1 into the upper block of the pressure relief block 3; press the inner tank cover 4 onto the inner tank 5; then screw the pressure relief block 3 onto the inner tank 5; finally, put the above assembled components into the outer tank 6.

[0028] During use, when the pressure in the digestion tank is 2 MPa, the pressure steam in the digestion tank can be released from the exhaust hole 301. When the pressure increases further, the pressure steam will be introduced into the internal pressure relief hole 402 through the pressure conducting hole 401. As the pressure increases, the outer cone 303 will be pushed upward, and then the pressure steam will be discharged from the external pressure relief hole 302, thereby achieving pressure release.

[0029] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", "left and right", "front and back", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0031] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A microwave digestion tank, comprising an outer tank (6), an inner tank (5) and a sealing plug (1), characterized in that: A spring plunger (2) and a pressure relief block (3) are provided in sequence between the sealing plug (1) and the inner tank (5); the spring plunger (2) is placed inside the sealing plug (1); the pressure relief block (3) is sleeved on the outside of the inner tank (5); an inner tank cover (4) is provided between the pressure relief block (3) and the inner tank (5); an inner cone (303) is formed on the inner tank cover (4); and an outer cone (403) matching the inner cone (303) is formed on the pressure relief block (3).

2. The microwave digestion tank according to claim 1, characterized in that: A pressure-conducting hole (401) is formed on the inner tank cover (4), the lower opening of the pressure-conducting hole (401) faces the inner cavity of the inner tank (5), an internal pressure-releasing hole (402) is provided above the pressure-conducting hole (401), and the upper opening of the internal pressure-releasing hole (402) is arranged on the upper cover surface of the inner tank cover (4).

3. The microwave digestion tank according to claim 1, characterized in that: The pressure relief block (3) comprises an upper block (31) and a lower block (32); the diameter of the lower block (32) is larger than that of the upper block (31); an external pressure relief hole (302) is formed on the lower block (32) near the upper block (31); and an exhaust hole (301) is provided on the top of the upper block (31).

4. A microwave digestion tank according to claim 3, characterized in that: The lower block (32) is provided with an internal thread, and the inner tank (5) is provided with an external thread matching the internal thread.

5. A microwave digestion tank according to claim 3, characterized in that: The upper block (31) and the lower block (32) are integrally formed of plastic material.

6. A microwave digestion tank according to claim 2, characterized in that: The diameter of the pressure-conducting hole (401) is smaller than the diameter of the internal pressure-relieving hole (402).

7. The microwave digestion vessel according to claim 1, characterized in that: The lower end portion of the sealing plug (1) abuts against the inside of the outer cone (403).

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