CN222087457U - Water Bath Nitrogen Purification Apparatus - Google Patents

Abstract

The present application discloses a water bath nitrogen blowing instrument, which belongs to the technical field of nitrogen blowing instrument equipment. The water bath nitrogen blowing instrument includes a water bath main unit and a nitrogen blowing device. The water bath main unit is provided with a water bath room, an air outlet and an observation window. The water bath room is provided with a nitrogen blowing device. The nitrogen blowing device includes a sleeve rod and a rotary air valve. The fixed body of the rotary air valve is arranged on the outer periphery of the rotating body. The two are rotatably connected. A total air port is arranged on the outer periphery of the fixed body, and a first annular air chamber is arranged on the inner periphery. An air channel is arranged on the rotating body. The top of the shaft is connected to the fixed body, the rotating sleeve is rotatably connected to the shaft, and the top of the rotating sleeve is connected to the rotating body. The sample holder and the gas needle holder are both fixedly connected to the rotating sleeve. The sample holder is provided with multiple sample fixing ports. The gas needle holder is provided with a clamp at the corresponding position of the sample fixing port, and a gas needle is arranged in the clamp. The water bath nitrogen blowing instrument of the present application does not need to temporarily set the concentration process and lift the sample holder during the experiment. The nitrogen blowing device can be rotated at any time to observe the sample status.

Description

Water bath nitrogen blowing instrument

Technical Field

The application relates to the technical field of nitrogen blowing instrument equipment, in particular to a water bath nitrogen blowing instrument.

Background

The nitrogen blowing instrument is a conventional instrument for preparing concentrated samples in liquid phase, gas phase and mass spectrometry analysis experiments, is widely applied to industries of pesticide residues, commercial inspection, pharmacy, food, environment, biological products and the like, is generally divided into semi-automatic (disc type) and full-automatic (integrated type) according to the degree of automation of the instrument, can be used for concentrating sample tubes with different specifications at the same time, is flexible to combine, and can be used for carrying out nitrogen blowing concentration on a test tube, a centrifuge tube, a beaker and a heart bottle on the same sample support.

The existing disc type water bath nitrogen blowing instrument, such as CN114486473A of Chinese invention disclosure, discloses a nitrogen blowing instrument with an infrared sensing function, a sample support of the nitrogen blowing instrument is not rotatable, so that the concentration progress of different sample tubes is inconvenient to observe, the rotating sample support easily causes winding and knotting of an air supply tube of each nitrogen blowing channel, different nitrogen blowing channels are supplied with air by the same air source (air pressure intensity), and when a plurality of different samples are concentrated, the air flow intensity of a nitrogen blowing needle can be adjusted with few gears.

Disclosure of Invention

The application provides a water bath nitrogen blowing instrument, which can overcome at least one or more problems in the prior art.

According to the first aspect of the application, a water bath nitrogen blowing instrument is provided, the water bath nitrogen blowing instrument comprises a water bath main machine, a nitrogen blowing device and an air needle, a water bath room is arranged on one side of the top of the water bath main machine, the bottom of the water bath room is communicated with a water outlet on the water bath main machine, an air outlet communicated with an air source is further arranged on the top of the water bath main machine, a transparent observation window is arranged on the front surface of the water bath main machine at the water bath room, the nitrogen blowing device is arranged in the water bath room, and a plurality of sample tubes and the air needle can be placed on the nitrogen blowing device;

The nitrogen blowing device comprises a loop bar, a sample support, an air needle support and a rotary air valve, wherein:

The rotary air valve comprises a fixed body and a rotary body, wherein the fixed body is arranged on the periphery of the rotary body, the rotary body is rotationally connected with the fixed body, a total air port is arranged on the periphery of the fixed body, a first annular air chamber communicated with the total air port is arranged on the periphery of the fixed body, a second annular air chamber is arranged on the periphery of the rotary body at the position corresponding to the first annular air chamber, at least one air passage communicated with the bottom surface of the rotary body is arranged in the rotary body, and the top of the air passage is communicated with the second annular air chamber;

The loop bar comprises a shaft lever and a rotating sleeve, the bottom of the shaft lever is connected with the bottom of the water bath chamber, the top of the shaft lever is connected with a fixed body of the rotary air valve, the rotating sleeve is rotationally connected with the shaft lever, and the top of the rotating sleeve is connected with a rotating body of the rotary air valve;

The sample support and the air needle support are fixedly connected with the rotating sleeve, a plurality of sample fixing ports are formed in the sample support, a clamp holder is arranged on the air needle support at the position corresponding to the sample fixing ports, and an air needle is arranged in the clamp holder;

the main air port is communicated with the air outlet of the water bath main machine, and the air passage is communicated with the air needle through the air dividing device.

The water bath nitrogen blowing instrument provided by the embodiment of the application can rotate the nitrogen blowing device to observe the state of a sample at any time without suspending the concentration process and lifting the sample support in the experimental process, and the rotary air valve can keep the air outlet of the water bath host machine and the connecting pipe of the total air port of the rotary air valve stationary when the sample pipe and the air needle rotate, so that the pipe body is prevented from winding and knotting.

In one possible implementation mode, the bottom center of the rotating body is exposed, the loop bar penetrates through the center of the rotating body, the top of the shaft rod in the loop bar is detachably connected with the inner top surface of the fixed body, the top of the rotating sleeve in the loop bar is detachably connected with the center of the rotating body, the bottom of the shaft rod is spliced with the bottom surface of the water bath chamber, the bottom of the rotating sleeve is abutted against the bottom surface of the water bath chamber, and a rubber ring is arranged between the bottom of the rotating sleeve and the shaft rod. In the implementation mode, the shaft lever plays a supporting role on the fixed body of the rotary air valve, the rotary sleeve plays a main supporting role on the rotary body of the rotary air valve, and the rotary sleeve and the rotary body can rotate relative to the water bath main machine.

In one possible implementation manner, the first annular air chamber is horizontally and annularly arranged along the inner peripheral surface of the fixed body, a plurality of annular sealing bodies are arranged on the contact surface of the fixed body and the rotating body, the annular sealing bodies are annularly and circumferentially arranged on the inner wall of the fixed body, and the annular sealing bodies are arranged on the upper side and the lower side of the first annular air chamber. In this implementation, the annular sealing body communicates the first annular air chamber and the second annular air chamber which are disposed opposite to each other and seals them from the outside, so that when the rotating body rotates, the gas introduced from the gas inlet of the fixed body can be discharged from the gas passage of the rotating body.

In one possible implementation, the fixing body comprises a cylindrical shell and a cap-shaped top shell, the top of the cylindrical shell is fixedly connected with the top shell, bearings are arranged at the contact surfaces of the upper end and the lower end of the cylindrical shell and the rotating body, a limiting plate is arranged at the top of the rotating body, the diameter of the limiting plate is larger than the inner diameter of the bearing, and the bottom of the limiting plate is propped against the inner ring of the bearing positioned at the top. In the implementation mode, the split design of the limiting plate and the top shell is convenient for the installation of the bearing, and meanwhile, the limiting plate is propped against the bearing, so that the rotary body and the fixed body are prevented from being separated.

In one possible implementation manner, a plurality of total air ports are longitudinally arranged on the rotary air valve, each total air port is communicated with a combination of a first annular air chamber and a second annular air chamber, annular sealing bodies for sealing are arranged on the upper side and the lower side of each first annular air chamber, and each second annular air chamber is communicated with at least one air passage. In the implementation mode, each total air port can be communicated with an air outlet arranged on a water bath main machine, each air outlet can generate different air pressure intensities, and correspondingly, the air dividing device can output multiple paths of air with different air pressure intensities simultaneously, so that the air flow intensity adjustable gear of the air needle is increased, and each air needle can be provided with an independent flow regulating valve, thereby increasing the air flow intensity adjustable range of the air needle.

In one possible implementation, the sample support is disposed in the water bath chamber, the sample support includes a clamping frame and a bracket, the clamping frame is disposed at the top of the bracket, the sample fixing openings are uniformly distributed along the outer edges of the clamping frame, the periphery of the clamping frame is provided with elastic fixing bodies with elasticity at the sample fixing openings, and the top of the bracket is fixedly connected with the clamping frame through a plurality of upright posts. In this implementation, the elastic fixture may allow the sample holder to hold multiple types of sample tubes simultaneously.

In one possible implementation, the elastic fixing body is an annular spring, the whole circumference is arranged on the periphery of the clamping frame, the clamping frame is a double-layer plate, and the annular spring is arranged between the double-layer plate. In this implementation, a simple and practical elastic fixing body design scheme is provided.

In one possible implementation manner, the air needle support is arranged above the sample support, the air needle support comprises an air distribution device and a tray frame, a through hole is formed in the tray frame at a position corresponding to the upper part of the sample fixing port, and a clamp holder capable of elastically clamping the air needle is arranged on the through hole. In the implementation mode, the clamp holder is convenient to use, can quickly adjust the height of the air needle, and has a clamping effect on the air needle.

In one possible implementation manner, the top surface of the gas distributing device is provided with a plurality of gas distributing inlets, one gas distributing inlet extends downwards in the gas distributing device and is communicated with a plurality of gas distributing outlets on the side surface of the gas distributing device, each gas distributing inlet is provided with a gas valve switch, the air passage outlet of the rotary gas valve is connected with the gas valve switch through a gas distributing pipe, and the gas distributing outlet of the gas distributing device is connected with the gas needle through a gas distributing pipe. In the implementation mode, the gas distribution device can divide the gas sent out by the gas channel of the rotary gas valve into multiple paths to be sent into the gas needle, and when multiple paths of gas sources with different gas pressure intensity are connected to the rotary gas valve, the rotary gas valve can send the gas sources with different gas pressure intensity into the gas needle in a branching way, so that the adjustable range of the gas flow intensity of the gas needle is increased.

It should be noted that the above various possible implementations may be combined on the premise that the schemes are not contradictory.

Drawings

Fig. 1 is a schematic structural diagram of a water bath nitrogen blowing instrument provided by an embodiment of the application.

Fig. 2 is a rear view of a nitrogen blower in a water bath according to an embodiment of the present application.

Fig. 3 is a schematic view of the nitrogen blowing apparatus of fig. 1.

Fig. 4 is a cross-sectional view of the nitrogen blowing apparatus of fig. 1.

Fig. 5 is a cross-sectional view of a rotary gas valve of the nitrogen blowing apparatus of fig. 1.

Reference numerals illustrate:

10. The water bath main machine comprises a water bath chamber, a water outlet, a water inlet, a water outlet, a 15 observing window, a 16 control screen, a 20 nitrogen blowing device, a 21 sleeve rod, a 211 shaft rod, a 2111 shaft rod fixing end, a 2112 shaft rod connecting end, a 212 rotary sleeve, a 2121 rotary rod fixing end, a 22 sample support, a 221 clamping frame, a 2211 sample fixing port, a 2212 elastic fixing body, a 222 bracket, a 2221 upright post, a 23 gas needle support, a 231 gas distributing device, a 2311 gas distributing inlet, a 2312 gas distributing outlet, a 232 tray frame, a 2321 clamp, a 233 gas needle, a 2331 gas blowing rod, a 2332 gas blowing needle, a 24 rotary gas valve, a 241 fixing body, a 2411 cylinder shell, a 24111 gas inlet, a 24112 first annular gas chamber, a 24113 annular sealing body, a 24114 bearing, a 2412 top shell, a 242 rotary body, a 2421 second annular gas chamber, a 2422 gas chamber, a 2423 gas distributing plate, a 30 gas pipe, a gas distributing pipe, a 50 gas pipe, a 52 gas pipe and a 60 gas distributing pipe.

Detailed Description

The present application will now be described with reference to the accompanying drawings, which illustrate several embodiments of the application. It will be understood, however, that this application may be embodied in many different forms and is not limited to the embodiments described below, which in fact are intended to provide a more complete disclosure of the application and to fully illustrate the scope of the application to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide yet additional embodiments.

It should be understood that throughout the drawings, like reference numerals refer to like elements. In the drawings, the size of certain features may be modified for clarity. The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. All terms (including technical and scientific terms) used in the specification have the meanings commonly understood by one of ordinary skill in the art unless otherwise defined. Well-known functions or constructions may not be described in detail for brevity and/or clarity.

As used in this specification, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. The use of the terms "comprising," "including," and "containing" in the specification mean that the recited features are present, but that one or more other features are not excluded. The use of the phrase "and/or" in the specification includes any and all combinations of one or more of the associated listed items.

In the description, an element is referred to as being "on," "attached" to, "connected" to, "coupled" to, "contacting" or the like another element, and the element may be directly on, attached to, connected to, coupled to or contacting the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly on," "directly attached to," directly connected to, "directly coupled to," or "directly contacting" another element, there are no intervening elements present.

In one aspect, referring to fig. 1 and 2, fig. 1 and 2 show structures of a water bath nitrogen blower at different angles, the water bath nitrogen blower includes a water bath main unit 10, a nitrogen blowing device 20, an air needle 233 and other accessories, the water bath main unit 10 includes a water bath chamber 11, a water outlet 12, an air inlet 13, an air outlet 14, an observation window 15 and a control screen 16, one side of the top of the water bath main unit 10 is provided with the water bath chamber 11, the water bath chamber is concentrated by the water bath chamber 11, the air inlet 13 connected with an air source is arranged at the back of the water bath main unit 10, the air outlet 14 of the air source is arranged at the top of the water bath main unit 10, a transparent observation window 15 is arranged on the water bath main unit 10 at the water bath chamber 11, when the nitrogen blowing device 20 rotates in the water bath chamber 11, the sample state can be observed through the transparent observation window 15 without suspending the concentration progress or lifting a sample support 22, the bottom of the water bath main unit 11 is communicated with the water outlet 12 at the back of the water bath main unit 10, the top of the water bath main unit 10 is provided with the control screen 16 near the water bath chamber 11, and the control screen 16 is mainly used for controlling the temperature and nitrogen blowing time.

The nitrogen blowing device 20 can be provided with a plurality of sample tubes and gas needles 233, and is used for distributing nitrogen blowing channels to be connected with the gas needles 233, the nitrogen blowing device 20 is arranged in the water bath chamber 11 and can rotate on the water bath main machine 10, and the nitrogen blowing device is specifically:

Referring to fig. 2 and 3, fig. 2 and 3 show different angles of the nitrogen blowing device 20, the device includes a loop bar 21, a sample holder 22, a gas needle holder 23, and a rotary gas valve 24, wherein:

The sleeve rod 21 comprises a shaft rod 211 and a rotating sleeve 212, a shaft rod fixing end 2111 at the bottom of the shaft rod 211 is fixedly inserted into the bottom of the water bath chamber 11, a shaft rod connecting end 2112 at the top of the shaft rod 211 is in threaded connection with the inner top surface of the fixing body 241 of the rotary air valve 24, but the sleeve rod is not limited to be fixed in a threaded connection mode;

The rotating sleeve 212 is sleeved on the outer periphery of the shaft 211 and is rotationally connected with the shaft 211, the bottom of the rotating sleeve 212 can fall on the top surface of the shaft fixing end 2111 of the shaft 211 (as shown in fig. 4) or can fall on the inner bottom surface of the water bath 11, and the rotating sleeve fixing end 2121 at the top of the rotating sleeve 212 is in threaded connection with the center of the rotating body 242 of the rotary air valve 24, but is not limited to being fixed in a threaded connection mode.

In practical application, in order to avoid water inflow between the rotating sleeve 212 and the shaft 211, a rubber ring 60 is disposed between the bottom of the rotating sleeve 212 and the shaft 211, and the rubber ring 60 seals the gap between the rotating sleeve 212 and the shaft 211, but does not affect the rotation of the rotating sleeve 212 around the shaft 211.

The sample support 22 is fixed on the periphery of the rotating sleeve 212 (fastened by bolts) and is arranged in the water bath 11, the sample support 22 comprises a clamping frame 221 and a bracket 222, the clamping frame 221 is arranged at the top of the bracket 222, a plurality of uniformly distributed sample fixing holes 2211 are formed in the periphery of the clamping frame 221, elastic fixing bodies 2212 with elasticity are arranged at the positions of the sample fixing holes 2211 on the periphery of the clamping frame 221, when a sample tube is inserted into the sample fixing holes 2211, the elastic fixing bodies 2212 are pressed against the periphery of the sample tube to play a role in stabilizing, the elastic fixing bodies 2212 shown in fig. 4 are annular springs, the whole periphery of the clamping frame 221 is arranged on the periphery of the clamping frame 221, the number of the sample fixing holes 2211 is twelve, the clamping frame 221 is in a double-layer plate structure, and the annular springs are placed on a plate structure positioned at the bottom layer;

The top of the bracket 222 is fixedly connected with the clamping frame 221 through a plurality of stand columns 2221, the length of the stand columns 2221 is smaller than that of the sample tube, a plurality of holes for water leakage are formed in the bracket 222, and after the sample tube is inserted into the sample fixing hole 2211, the bottom of the sample tube falls on the bracket 222.

The air needle support 23 is fixed on the periphery of the rotating sleeve 212 (fastened by bolts) and is arranged above the sample support 22, the air needle support 23 comprises an air distributing device 231 and a tray frame 232, a through hole is formed in the tray frame 232 at a position corresponding to the position above the sample fixing port 2211, a clamp holder 2321 capable of elastically clamping the air needle 233 is arranged on the through hole (the clamp holder 2321 is in the prior art), the clamp holder 2321 can be pressed to release the clamp of the air needle 233, so that the distance from the air needle 233 to a sample tube can be adjusted, the clamp plate on the clamp holder 2321 is released, and the clamp holder 2321 can clamp the air needle 233 under the action of spring force in the clamp holder 2321 to play a role in fixing;

The top of the tray frame 232 can be integrally formed with the air distribution device 231, the top surface of the air distribution device 231 is provided with a plurality of air distribution inlets 2311, one air distribution inlet 2311 extends downwards in the air distribution device 231 and is communicated with a plurality of air distribution outlets 2312 on the side surface of the air distribution device 231, each air distribution inlet 2311 is provided with an air valve switch 30, each air distribution outlet 2312 is provided with a shortcut plug, in fig. 3, the air distribution device 231 is provided with four air distribution inlets 2311, each air distribution inlet 2311 is communicated with three air distribution outlets 2312 nearest to the air distribution inlet 2311, and thus one air valve switch 30 can control the air flow on/off of three air needles 233.

The air needle 233 comprises a blowing rod 2331 and a blowing needle 2332, wherein the top of the blowing rod 2331 is provided with a quick connector, the bottom of the blowing rod 2331 is detachably connected with the blowing needle 2332, the quick connector at the top of the blowing rod 2331 is connected with the quick connector of an air distribution outlet 2312 through an air pipe 52, twelve paths of air distribution outlets 2312 are arranged, and twelve corresponding air needles 233 are arranged.

The conventional nitrogen blowing device 20 can rotate around the water bath host 10, but an air supply pipe (in the application, the main air pipe 50) connected to the nitrogen blowing device 20 can be wound and knotted, so the application provides a rotary air valve 24 which can not drive the main air pipe 50 to rotate in the rotating process of the nitrogen blowing device 20, referring to fig. 5, fig. 5 shows a structure of the rotary air valve 24, the rotary air valve 24 comprises a fixed body 241 and a rotary body 242, the fixed body 241 is arranged on the periphery of the rotary body 242 and is rotationally connected with the rotary body 242, the bottom center of the rotary body 242 is exposed, a sleeve rod 21 passes through the center of the rotary body 242, a top fixed end 2111 of a shaft 211 of the sleeve rod 21 is in threaded connection with the inner top surface of the fixed body 241, a top rotating sleeve fixed end 2121 of the sleeve rod 21 is in threaded connection with the center of the rotary body 242, and the shaft 211 is fixedly connected with the water bath chamber 11, namely the shaft 211 and the fixed body 241 is fixedly connected with the water bath host 10, the main air valve 24 is rotationally connected with the rotary body 241, a main air port 24111 is arranged on the periphery of the fixed body 241, a first annular air chamber 24112 is arranged on the inner periphery of the fixed body 241, a plurality of annular air chambers 2422 are correspondingly arranged on the annular air chambers 2421 and are correspondingly arranged on the annular air chambers 2422, and the annular air chambers 2421 are correspondingly communicated with the inner surfaces of the annular air chambers 2421 and 2422.

In order to maintain the air tightness of the first annular air chamber 24112 and the second annular air chamber 2421, a plurality of annular sealing bodies 24113 are provided on the contact surface of the fixed body 241 and the rotating body 242, the annular sealing bodies 24113 are distributed at the top and bottom of the first annular air chamber 24112, and specifically, the annular sealing bodies 24113 are disposed on the inner wall of the fixed body 241 in an annular whole circumference.

In order to reduce the resistance of the nitrogen blowing device 20 to rotate, a plurality of bearings 24114 are further disposed on the contact surface of the fixed body 241 and the rotating body 242, and in fig. 5, the bearings 24114 are disposed on the inner walls of the top and bottom of the cylinder shell 2411 of the fixed body 241, for this purpose, it is to be noted that, in order to facilitate assembling the bearing 24114, the fixed body 241 includes a cylinder shell 2411 and a cap-shaped top shell 2412, the cylinder shell 2411 and the top shell 2412 are connected by bolts, a limiting plate 2423 is disposed on the top of the rotating body 242, the diameter of the limiting plate 2423 is larger than the inner diameter of the bearing 24114, and the bottom of the limiting plate 2423 can abut against the inner ring of the bearing 24114 located on the top.

In application, four air passages 2422 are arranged on the fixed body 241, the air outlet end of each air passage 2422 is connected with a quick connector, the air outlet 14 of the water bath main machine 10 and the total air outlet 24111 of the rotary air valve 24 are respectively provided with a quick connector, the air outlet 14 of the water bath main machine 10 is connected with the total air outlet 24111 of the rotary air valve 24 through the total air pipe 50, and the air outlet end of the air passage 2422 of the rotary air valve 24 is connected with the air inlet end of the air valve switch 30 through the air distribution pipe 51.

The connection scheme is as follows:

The main water bath machine 10 is fixedly connected with a sleeve rod 21 (a shaft lever 211), a rotary air valve 24 (a fixed body 241) and a main air pipe 50;

The rotary connection with the water bath main machine 10 comprises a sleeve rod 21 (a rotary sleeve 212), a rotary air valve 24 (a rotary body 242), a sample support 22 and an air needle support 23;

therefore, the nitrogen blowing device 20 can be rotated at any time to observe the state of the sample without suspending the concentration process and lifting the sample support 22 during the experiment.

The rotary air valve 24 provided by the application can keep the total air pipe 50 still when the nitrogen blowing device 20 drives the sample pipe and the air needle 233 to rotate, and the total air pipe 50 is prevented from winding and knotting, and the additionally obtained technical effects are as follows:

The rotary air valve 24 may be longitudinally provided with a plurality of total air ports 24111, each total air port 24111 is communicated with a first annular air chamber 24112 and a second annular air chamber 2421, the first annular air chamber 24112 and the second annular air chamber 2421 which are communicated with different total air ports 24111 are independent and are not communicated, each corresponding first annular air chamber 24112 is sealed and isolated by a plurality of annular sealing bodies 24113, each second annular air chamber 2421 is communicated with at least one independent air passage 2422, and thus, each total air port 24111 can be communicated with an air outlet 14 arranged on a water bath host 10, each air outlet 14 can generate different air pressure intensities, correspondingly, the air dividing device 231 can output multiple air with different air pressure intensities simultaneously, so that the adjustable gear of the air flow intensity of the air needle 233 is increased, and each air needle 233 can be provided with an independent flow regulating valve, thereby increasing the adjustable range of the air flow intensity of the air needle 233.

The water bath host 10 is in the prior art, and various data in various sensor detection experiments can be added, so that the water bath nitrogen blowing instrument is intelligent.

Although exemplary embodiments of the present application have been described, it will be understood by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present application without departing from the spirit and scope of the application. Accordingly, all changes and modifications are intended to be included within the scope of the present application as defined by the appended claims. The application is defined by the following claims, with equivalents of the claims to be included therein.

Claims (9)

1. The utility model provides a water bath nitrogen blows appearance, includes water bath host computer, nitrogen and blows device and gas needle, water bath host computer top one side is equipped with the water bath room, and water bath room bottom communicates with the outlet on the water bath host computer, and water bath host computer top still is equipped with the gas outlet with the air supply intercommunication, is equipped with transparent observation window in water bath room department on the water bath host computer is positive, be equipped with nitrogen in the water bath room and blow the device, nitrogen has placed a plurality of sample tubes and gas needle on blowing the device, a serial communication port, nitrogen blows the device and includes loop bar, sample support, gas needle support and rotatory pneumatic valve, wherein:

The rotary air valve comprises a fixed body and a rotary body, wherein the fixed body is arranged on the periphery of the rotary body, the fixed body is rotationally connected with the rotary body, a total air port is arranged on the periphery of the fixed body, and a first annular air chamber communicated with the total air port is arranged on the periphery of the fixed body;

The sleeve rod comprises a shaft rod and a rotating sleeve, wherein the bottom of the shaft rod is connected with the bottom of the water bath chamber, and the top of the shaft rod is connected with a fixed body of the rotary air valve;

The sample support and the air needle support are fixedly connected with the rotating sleeve, a plurality of sample fixing ports are formed in the sample support, a clamp holder is arranged on the air needle support at the position corresponding to the sample fixing ports, and an air needle is arranged in the clamp holder;

The main air port is communicated with an air outlet of the water bath main machine, and the air passage is communicated with an air needle through an air dividing device;

The rotary air valve can keep the air outlet of the water bath host and the connecting pipe of the total air port of the rotary air valve stationary when the sample pipe and the air needle rotate.

2. The nitrogen blowing instrument for water bath according to claim 1, wherein the bottom center of the rotating body is exposed, the loop bar penetrates through the center of the rotating body, the top of the shaft bar in the loop bar is detachably connected with the inner top surface of the fixed body, the top of the rotating sleeve in the loop bar is detachably connected with the center of the rotating body, the bottom of the shaft bar is spliced with the bottom surface of the water bath chamber, the bottom of the rotating sleeve is abutted against the bottom surface of the water bath chamber, and a rubber ring is arranged between the bottom of the rotating sleeve and the shaft bar.

3. The nitrogen blowing instrument for water bath according to claim 1, wherein the first annular air chamber is horizontally and annularly arranged along the inner peripheral surface of the fixed body, a plurality of annular sealing bodies are arranged on the contact surface of the fixed body and the rotating body, the annular sealing bodies are annularly and circumferentially arranged on the inner wall of the fixed body, and the annular sealing bodies are arranged on the upper side and the lower side of the first annular air chamber.

4. The nitrogen blowing instrument for water bath according to claim 1, wherein the fixed body comprises a cylindrical shell and a cap-shaped top shell, the top of the shell is fixedly connected with the top shell, bearings are arranged at the contact surfaces of the upper end and the lower end of the shell and the rotating body, a limiting plate is arranged at the top of the rotating body, the diameter of the limiting plate is larger than the inner diameter of the bearing, and the bottom of the limiting plate is propped against an inner ring of the bearing positioned at the top.

5. The nitrogen blowing instrument for water bath according to claim 1, wherein a plurality of total air ports are longitudinally arranged on the rotary air valve, each total air port is communicated with a combination of a first annular air chamber and a second annular air chamber, annular sealing bodies for sealing are arranged on the upper side and the lower side of each first annular air chamber, and each second annular air chamber is communicated with at least one air passage.

6. The nitrogen blowing instrument for water bath according to claim 1, wherein the sample support is disposed in the water bath chamber, the sample support comprises a clamping frame and a bracket, the clamping frame is disposed at the top of the bracket, the sample fixing openings are uniformly distributed along the outer edge of the clamping frame, an elastic fixing body with elasticity is disposed at the periphery of the clamping frame at the sample fixing opening, and the top of the bracket is fixedly connected with the clamping frame through a plurality of upright posts.

7. The nitrogen blowing instrument of claim 6, wherein the elastic fixing body is an annular spring, the annular spring is arranged on the periphery of the clamping frame in the whole periphery, the clamping frame is a double-layer plate, and the annular spring is arranged between the double-layer plate.

8. The nitrogen blowing instrument for water bath according to claim 1, wherein the air needle support is arranged above the sample support, the air needle support comprises an air dividing device and a tray frame, a through hole is arranged on the tray frame at a position corresponding to the upper part of the sample fixing port, and a clamp holder capable of elastically clamping the air needle is arranged on the through hole.

9. The nitrogen blowing instrument for water bath according to claim 1, wherein the top surface of the gas dividing device is provided with a plurality of gas dividing inlets, one gas dividing inlet extends downwards in the gas dividing device and is communicated with a plurality of gas dividing outlets on the side surface of the gas dividing device, each gas dividing inlet is provided with a gas valve switch, the gas passage outlet of the rotary gas valve is connected with the gas valve switch through a gas dividing pipe, and the gas dividing outlet of the gas dividing device is connected with a gas needle through a gas dividing pipe.