A scald-proof Kjeldahl nitrogen analyzer
By adopting a double-layer wall structure and a combination design of heat conductor sheet, thermal strip, arc-shaped scraper and pull rod in the test container of Kjeldahl nitrogen fixator, the scald and liquid dripping problems during the test container are solved, and the equipment is improved The stability and insulation effect ensure safe operation.
Patent Information
- Application Number
- CN202310035420.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-01-10
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2043-01-10
AI Technical Summary
The existing Kjeldahl nitrogen fixtures are prone to burn staff when taking the test container, and the acid remaining on the steam pipe may drip, causing safety hazards.
A test container with a double-layer wall structure was designed, with a heat conduction sheet and thermal strip between the inner layer and the outer layer, connected by elastic parts, arc-shaped scraper and tie rod structure for steam pipe cleaning to avoid heat transfer and liquid Drop, and use cooling tanks and wax sleeves to improve insulation effect.
It effectively prevents scalds when taking the test container, avoids dripping of residual liquid on the steam pipe, improves the stability and insulation effect of the test container, and reduces the safety risks of staff.
Smart Images
Figure CN115932152B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of Kjeldahl nitrogen analyzers, and in particular to a scald-proof Kjeldahl nitrogen analyzer. Background Art
[0002] The Kjeldahl method was established by Danish chemist Kjeldahl in 1883. It has now developed into macro, micro, and micro Kjeldahl methods and automatic nitrogen analyzer methods, and is a common method for analyzing the nitrogen content of organic compounds. The theoretical basis of the Kjeldahl method is that the nitrogen content in protein accounts for about 16% of its total mass (12%-19%). Therefore, by measuring the nitrogen content in a substance, the total protein content in the substance can be estimated (assuming that the nitrogen in the substance to be measured comes entirely from protein), that is, protein content = nitrogen content / 16%.
[0003] The Kjeldahl nitrogen determination principle requires three steps, namely digestion, distillation, and titration. During the digestion process, nitrogen-containing organic compounds (proteins) need to be heated together with concentrated sulfuric acid and a catalyst (copper sulfate or Kjeldahl digestion tablets) to decompose the protein, in which carbon and hydrogen are oxidized to carbon dioxide and water, while the organic nitrogen in the sample is converted to ammonia (NH3) and combines with sulfuric acid to form ammonium sulfate (NH4 + ). Distillation: Add NaOH to the diluted solution, distill to release NH3, condense and collect in boric acid solution. Titration: Titrate with a standard sulfuric acid solution of known concentration, calculate the nitrogen content based on the amount of hydrochloric acid consumed, and then multiply by the corresponding conversion factor to obtain the protein content.
[0004] Existing nitrogen analyzers are mainly heated by passing steam. After passing steam into the test container containing the sample, the generated gas is condensed through the distillation tube and the condenser tube and then enters the test container to obtain the test result with low-valent boric acid. Since the liquid needs to be heated for 0.5-1h after it becomes blue-green and clear during the heating process, the test container is made of glass tubes. When taking the test container, the surface temperature of the test container is high, which can easily burn the staff. At the same time, steam is passed into the test container through the steam pipe. When taking the test container, there may be residual acid on the steam pipe, which will drip onto the hands of the staff after the test container is taken down. Summary of the invention
[0005] The present invention aims to provide a scald-proof Kjeldahl nitrogen analyzer, which can avoid scalding when taking a test container.
[0006] The basic solution provided by the present invention is: a scald-proof Kjeldahl nitrogen analyzer, including a test container, the test container is a double-wall structure, including an outer layer, an inner layer and a middle cavity, a heat-conducting plate is provided in the middle cavity, the heat-conducting plate is connected to the inner wall of the outer layer through an elastic member, a heat-conducting strip is provided on the heat-conducting plate, the other end of the heat-conducting strip passes through the bottom of the test container, a steam pipe cleaning structure is provided at the bottle mouth of the test container, the steam pipe cleaning structure includes symmetrically arranged arc scrapers, a pull rod is provided on the side of the arc scraper plate close to the inner wall of the test container, the other end of the pull rod passes through the inner layer and the outer layer of the test container, and a stop block is provided at the end, and the part of the pull rod located in the middle cavity is fixedly connected to the heat-conducting plate.
[0007] The principle of the present invention is that a heat conducting sheet is arranged in the middle cavity of the test container with a double-wall structure, and a heat conducting strip is connected to the heat conducting sheet, so that the heat in the middle cavity is absorbed by the heat conducting sheet and the heat conducting strip. The heat conducting sheet and the outer wall of the test container are connected by an elastic member, and the arc scraper is connected with a pull rod. When in use, the pull rod is pulled to pass the steam pipe between the symmetrically arranged arc scrapers and extend into the test container. Since the steam pipe passes between the two arc scrapers, under the action of the steam pipe, the arc scraper moves toward the inner layer of the test container, and the pull rod moves outward. At the same time, since the part of the pull rod located in the middle cavity is connected to the heat conducting sheet, when the pull rod moves outward, the heat conducting sheet also moves toward the inner wall of the outer layer, close to the inner wall of the outer layer, and the temperature of the outer wall is transmitted to the outside through the heat conducting sheet and the heat conducting strip connected to the outside world, and at the same time, the arc scraper will be clamped under the reaction force of the spring. When the test container is removed, the arc scraper scrapes off the residual liquid on the steam pipe.
[0008] Compared with the existing technology, it has the following advantages:
[0009] 1. It can prevent workers from being scalded when removing the test container. By setting the test container as a double-wall structure, when taking the test container, hold the outer layer to reduce the heat felt when holding. At the same time, a heat conductive sheet is set in the middle cavity. After inserting the steam pipe, the heat conductive sheet is driven by the arc scraper to cling to the inner wall of the outer layer, absorb the heat at the outer layer, and further reduce the heat felt when holding. At the same time, when removing the test tube, the steam pipe loses its limit. Under the action of the spring, the heat conductive sheet is reset. When holding the test container, the heat conductive sheet is no longer close to the outer layer, preventing the heat on the heat conductive sheet from being transferred to the outer layer.
[0010] 2. Prevent residual solution on the steam pipe from dripping onto the hands of the staff when the test container is removed. By setting an arc scraper to clamp the steam pipe, the arc scraper will scrape off the solution on the surface of the steam pipe when the test container is removed, thereby preventing residual liquid from dripping when the test container is removed.
[0011] 3. Make the test container more stable. Under the reaction force of the spring, the arc scraper clamps the steam pipe, making the test container more stable.
[0012] 4. To achieve better thermal insulation effect in the test container, the test container is set to a double-wall structure, and the heat conductive sheet only absorbs the heat of the outer layer during heating, so that the inner layer can achieve better thermal insulation effect for the test container, thereby improving the heating effect and efficiency.
[0013] Furthermore, the thermally conductive bar includes a fixed thermally conductive bar and a movable thermally conductive bar, one end of the movable thermally conductive bar is connected to the thermally conductive sheet, the fixed thermally conductive bar passes through the bottom of the test container, a bar track is provided at the upper end of the fixed thermally conductive bar, and the other end of the movable thermally conductive bar is provided with a sliding sheet slidably connected to the bar track.
[0014] The thermally conductive strips include fixed thermally conductive strips and movable thermally conductive strips. The movable thermally conductive strips are fixedly connected to the thermally conductive sheet, and the movable thermally conductive strips are slidably connected to the fixed thermally conductive strips. When the arc-shaped scraper drives the thermally conductive sheet to move, it only drives the movable thermally conductive strips to move, but does not drive the fixed thermally conductive strips to move. The thermally conductive strips are arranged as movable thermally conductive strips and fixed thermally conductive strips, so that when the thermally conductive sheet drives the thermally conductive strips to move, they are connected to the outside world, and the fixed thermally conductive strips that transfer heat to the outside world do not move, thereby allowing the middle cavity to form a closed space.
[0015] Furthermore, it also includes a container fixing seat, the container fixing seat is provided with a container positioning groove, the container positioning groove is provided with a limiting member, the limiting member includes symmetrically arranged positioning blocks, the positioning blocks are provided with a fixing rod extending out of the container fixing seat, and the fixing rod is sleeved with a supporting spring.
[0016] When in use, the test container is fixed in the container positioning groove, and the lower part of the test container is clamped by the positioning block to fix the lower end of the test container, thereby improving the stability of the test container fixation.
[0017] Furthermore, a cooling groove is provided at the lower part of the container fixing seat, and a coolant is provided in the cooling groove. A fixing bar plug hole is provided at the bottom of the container fixing groove, and the fixing bar plug hole is connected to the cooling groove.
[0018] A cooling groove is opened at the lower part of the fixing seat, and a coolant is arranged in the cooling groove. The container fixing groove is opened with a fixing bar plug hole connected with the cooling groove, so that the fixed thermal conductive bar can be inserted into the cooling groove from the fixing bar plug hole. The heat of the fixed thermal conductive bar is absorbed by the coolant in the cooling groove, thereby further improving the efficiency of heat absorption.
[0019] Furthermore, an arc-shaped groove that passes through the fixed block in the vertical direction is opened on the opposite side of the symmetrically arranged positioning block, and also includes a wax sleeve that cooperates with the arc-shaped groove. The wax sleeve can be sleeved on the arc-shaped groove, and a hemispherical groove is provided on the wax sleeve. When the test container is placed on the hemispherical groove, the fixed thermal conductive strip is located above the fixed strip socket.
[0020] The symmetrically arranged positioning blocks are provided with arc grooves, and a wax sleeve is sleeved on the arc grooves. The wax sleeves are provided with hemispherical grooves. Initially, the pull sleeves on the two positioning blocks are made to abut against each other to form a spherical groove, and the test container is placed on the spherical groove. The spherical groove lifts the bottom of the test container. At this time, the fixed heat-conducting strip is located above the cooling groove and does not absorb heat through the coolant. After heating begins, as the temperature rises, the wax sleeve in contact with the bottom of the test container gradually melts. During the melting of the wax sleeve, the test container gradually moves downward. When the wax sleeve is completely melted, the arc groove clamps the test container under the action of the support spring, and the position of the test container remains fixed. At this time, the fixed heat-conducting strip is inserted into the cooling groove to absorb heat through the coolant. Thus, in the initial stage of heating, the cooling liquid is not used for cooling, and the heat preservation in the test container during the heating process is ensured. The melting of the wax sleeve progresses with time. After heating for a certain period of time, the wax sleeve is completely melted, and the fixed heat-conducting strip is inserted into the cooling groove and begins to cool down through the coolant, that is, after heating for a certain period of time, the heat absorption efficiency needs to be improved before the test container is removed.
[0021] Furthermore, the middle cavity is filled with inert gas.
[0022] Inert gas is filled into the middle cavity to improve the thermal insulation of the middle cavity, thereby improving the thermal insulation effect of the inner layer.
[0023] Furthermore, the heat conducting sheet is located at the upper part of the middle cavity, and a gripping portion is provided at the middle part of the outer layer of the test container. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is a structural schematic diagram of a first embodiment of a scald-proof Kjeldahl nitrogen analyzer of the present invention;
[0025] Figure 2 It is a schematic diagram of the partial enlarged structure of A in the first embodiment of a scald-proof Kjeldahl nitrogen analyzer of the present invention;
[0026] Figure 3 It is a schematic diagram of the partial enlarged structure of the B portion in the first embodiment of the scald-proof Kjeldahl nitrogen analyzer of the present invention;
[0027] Figure 4 This is a schematic diagram of the structure of a container fixing seat in a second embodiment of a scald-proof Kjeldahl nitrogen analyzer of the present invention;
[0028] Figure 5The figure is a schematic diagram of the top view of the structure of the limiter in the second embodiment of the scald-proof Kjeldahl nitrogen analyzer of the present invention. DETAILED DESCRIPTION
[0029] The following is further described in detail through specific implementation methods:
[0030] The marks in the drawings of the specification include: test container 1, inner layer 11, outer layer 12, middle cavity 13, arc scraper 21, pull rod 22, block 23, heat conductive sheet 31, movable heat conductive strip 321, fixed heat conductive strip 322, bar track 323, spring 4, gripping portion 5, container fixing seat 6, cooling groove 61, container positioning groove 7, fixing strip socket 71, positioning block 8, wax sleeve 81, hemispherical groove 811, arc groove 82, fixing rod 9, support spring 91.
[0031] Embodiment 1 is basically as shown in the attached Figure 1 As shown:
[0032] A scald-proof Kjeldahl nitrogen analyzer includes a test container 1. The test container 1 is a double-wall structure, including an inner layer 11 and an outer layer 12. In this embodiment, the inner layer 11 and the outer layer 12 of the test container 1 are both made of glass. There is a middle cavity 13 between the inner layer 11 and the outer layer 12. The middle cavity 13 is filled with an inert gas, which is helium in this embodiment. A gripping portion 5 is provided in the middle of the test container 1.
[0033] The mouth of the test container 1 is symmetrically provided with a steam pipe cleaning structure, such as Figure 2 As shown, the steam pipe cleaning structure includes an arc scraper 21, a pull rod 22, and a stopper 23, wherein the railing 22 penetrates the inner layer 11, the middle cavity 13, and the outer layer 12 of the test container 1. The contact parts of the pull rod 22 with the inner layer 11 and the outer layer 12 are sealed by a sealing rubber ring to ensure the airtightness of the middle cavity 13. The stopper 23 is fixedly connected to one end of the pull rod located outside the outer layer 12, and the arc scraper 21 is fixedly connected to one end of the pull rod 22 located inside the inner layer 11, and the arc surface is coaxial with the bottle mouth of the test container 1.
[0034] like Figure 2 As shown, a heat conducting sheet 31 is provided in the middle cavity 13, and the heat conducting sheet 31 is fixedly connected to the inner wall of the outer layer 12 through the spring 5, and the heat conducting sheet 31 is fixedly connected to the bottom of the portion of the gear lever 23 located in the middle cavity 13, and a heat conducting strip is fixedly connected to the bottom of the heat conducting sheet 31, and the lower end of the heat conducting strip passes through the inner layer 11, the middle cavity 13 and the outer layer 12 at the bottom of the test container 1, and the portion where the heat conducting strip contacts the inner layer 11 and the outer layer 12 is also sealed by a sealing rubber ring. The heat conducting sheet 31 and the heat conducting strip are both made of metal heat conducting material, specifically copper in this embodiment.
[0035] like Figure 3As shown, the heat conducting strip includes a movable heat conducting strip 321 and a fixed heat conducting strip 322. The movable heat conducting strip 321 is fixedly connected to the bottom of the heat conducting sheet 31. The upper end of the fixed heat conducting strip 322 is provided with a bar track 323. The two ends of the bar track 323 are respectively fixedly connected to the inner layer 11 and the outer layer 12. The lower end of the movable heat conducting strip 321 is slidably connected to the bar track 323. The lower end of the fixed heat conducting strip 322 penetrates the inner layer 11, the middle cavity 13 and the outer layer 12 at the bottom of the test container 1.
[0036] The specific implementation process is as follows:
[0037] When in use, pull the stopper 23 to insert the steam pipe into the test container 1, then release the stopper 23, the arc surface of the arc scraper 21 fits with the steam pipe, and the arc scraper 21 arranged symmetrically clamps the steam pipe. At the same time, due to the insertion limit of the steam pipe, the arc scraper is closer to the inner layer 11, so that the pull rod 22 moves outward, and the part of the gear lever 23 located in the middle cavity 13 is fixedly connected to the heat conductive sheet 31, so that the heat conductive sheet 31 is closely attached to the inner wall of the outer layer 12 under the drive of the gear lever 23, so that the heat of the outer layer 12 is absorbed by the heat conductive sheet 31. When the heat conductive sheet 31 moves, it drives the movable heat conductive strip 321 to move, and the movable heat conductive strip 321 slides in the bar guide 323, and the fixed heat conductive strip 322 does not move. The heat of the outer layer 12 is transferred out through heat conduction of the heat conductive sheet 31 , the movable heat conductive sheet 321 and the fixed heat conductive sheet 322 , thereby reducing the heat of the outer layer 12 of the test container 1 and preventing the staff from being burned when taking the test container 1 .
[0038] After the test is finished, when the test container 1 is removed, the residual liquid on the steam pipe is scraped off by the arc scraper 21 to prevent the residual liquid on the steam pipe from dripping on the hands of the staff when the test container 1 is removed. At the same time, the steam pipe is no longer limited, and under the action of the spring, the heat conducting sheet 31 is reset and no longer closely adheres to the outer layer 12.
[0039] Embodiment 2
[0040] The difference between this embodiment and the first embodiment is that in this embodiment, a container fixing seat is also included, as shown in FIG. Figure 4 As shown, it also includes a container fixing seat 6, a container positioning groove 7 is opened at the upper end of the container fixing seat 6, a cooling groove 61 is opened at the lower part of the container fixing seat 6, and a coolant is arranged in the cooling groove 61. In this embodiment, the coolant is specifically cold water.
[0041] A limiting member is provided in the container positioning groove 7, such as Figure 5As shown, the limiting member includes a symmetrically arranged positioning block 8, on which a fixing rod 9 extending outside the container fixing seat 6 is provided, and a supporting spring 91 is sleeved on the fixing rod 9. Two fixing bar insertion holes 71 are provided at the bottom of the container fixing groove 7, and the size and distance of the fixing bar insertion holes 71 correspond to the fixed heat conductive strip 322 on the test container. The fixing bar insertion holes 71 are connected to the cooling groove 61.
[0042] Combination Figure 5 On the opposite side of the symmetrically arranged positioning block 8, an arc groove 82 is provided which penetrates the fixing block 8 in the vertical direction, and also includes a wax sleeve 81 which cooperates with the arc groove. The wax sleeve 81 can be sleeved on the arc groove 82. A hemispherical groove 811 is provided on the wax sleeve 81. The test container 1 is prevented from being on the hemispherical groove 811. The fixed heat conductive strip 322 is located above the cooling groove 61.
[0043] The specific implementation process is as follows:
[0044] When in use, the wax sleeves 81 are sleeved on the symmetrically arranged fixing blocks 8. The wax sleeves 81 are disposable. The wax sleeves 81 on the two fixing blocks 8 are abutted against each other. The hemispherical grooves 811 on the two wax sleeves 81 form a spherical groove. The bottom of the test container 11 is placed on the spherical groove.
[0045] As the solution in the test container 1 is heated, the wax sleeve 81 gradually melts, and the test container 1 gradually moves downward. When the test container passes through the wax sleeve 81, the fixed heat-conducting strip 322 is inserted into the fixed strip insertion hole 71. At this time, the wax sleeve 81 sleeved on the fixed block 8 has not completely melted. As time goes by, the remaining part of the wax sleeve 81 melts. Under the lubrication of the melted wax oil, the test container 1 continues to move downward. When the wax sleeve 81 is completely melted, under the action of the support spring 91, the arc groove 82 of the fixed block 8 clamps the test container 1, and the test container 1 no longer moves downward. At this time, the fixed heat-conducting strip 322 is inserted into the cooling groove 61 through the fixed strip insertion hole 71, and begins to cool down through the coolant, that is, after heating for a certain time, it is necessary to improve the heat absorption efficiency before removing the test container.
[0046] Embodiment 3
[0047] The difference between this embodiment and the first embodiment is that the movable heat conductive strip is a bimetallic strip bent toward the inner layer, the bimetallic strip is a memory metal, and when the bimetallic strip is bent, it does not contact the bar track, and when the bimetallic strip is vertical, it contacts the bar track.
[0048] At room temperature, the bimetallic strip bends and does not contact the fixed heat-conducting strip. When the temperature rises, the bimetallic strip contacts the fixed heat-conducting strip. At low temperatures, it is separated from the strip track in a bent state. As the heated metal temperature rises, the expansion coefficients of the inner and outer metal layers are different, forming a tendency to bend outward, thus becoming straight and contacting the strip track, improving the heat dissipation efficiency. The heat dissipation rate can be adaptively adjusted through the bimetallic strip.
[0049] The above are only embodiments of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field know all the common technical knowledge in the technical field to which the invention belongs before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. A scald-proof Kjeldahl nitrogen analyzer, characterized in that: A test container is included, wherein the test container is a double-wall structure, including an outer layer, an inner layer and a middle cavity, a heat conducting sheet is provided in the middle cavity, the heat conducting sheet is connected to the inner wall of the outer layer through an elastic member, a heat conducting strip is provided on the heat conducting sheet, the other end of the heat conducting strip passes through the bottom of the test container, a steam pipe cleaning structure is provided at the mouth of the test container, the steam pipe cleaning structure includes a symmetrically arranged arc scraper, a pull rod is provided on one side of the arc scraper close to the inner wall of the test container, the other end of the pull rod passes through the inner layer and the outer layer of the test container, and a stopper is provided at the end of the other end, and the part of the pull rod located in the middle cavity is fixedly connected to the heat conducting sheet; The heat-conducting strip includes a fixed heat-conducting strip and a movable heat-conducting strip, one end of the movable heat-conducting strip is connected to the heat-conducting sheet, the fixed heat-conducting strip runs through the bottom of the test container, the upper end of the fixed heat-conducting strip is provided with a bar track, and the other end of the movable heat-conducting strip is provided with a sliding sheet slidably connected to the bar track; It also includes a container fixing seat, the container fixing seat is provided with a container positioning groove, the container positioning groove is provided with a limiting member, the limiting member includes a symmetrically arranged positioning block, the positioning block is provided with a fixing rod extending outside the container fixing seat, and the fixing rod is sleeved with a supporting spring; A cooling groove is provided at the bottom of the container fixing seat, and a coolant is provided in the cooling groove. A fixing bar plug hole is provided at the bottom of the container positioning groove, and the fixing bar plug hole is connected to the cooling groove. An arc-shaped groove which passes through the positioning block in the vertical direction is opened on the opposite side of the symmetrically arranged positioning block, and also includes a wax sleeve which cooperates with the arc-shaped groove. The wax sleeve can be sleeved on the arc-shaped groove, and a hemispherical groove is provided on the wax sleeve. When the test container is placed on the hemispherical groove, the fixed thermal conductive strip is located above the fixed strip plug hole.
2. The anti-scalding Kjeldahl nitrogen analyzer according to claim 1, characterized in that: The middle cavity is filled with inert gas.
3. The anti-scalding Kjeldahl nitrogen analyzer according to claim 1, characterized in that: The heat conducting sheet is located at the upper part of the middle cavity, and a gripping portion is provided at the middle part of the outer layer of the test container.