CN203949896U - The automatic sampler of coulometry micro-water analyzer and injector sampling assemble - Google Patents

Abstract

The utility model discloses an automatic sample injector and a sampling assembly of the sample injector for a Coulomb method trace moisture measuring instrument. The automatic sample injector includes a pipetting gun, and the components in the pipetting gun include a push button, a piston rod, a casing, Piston, spring, tip unloading button, the bottom end of the housing is a gun head, and also includes the sampler sampling assembly described in any one of the following technical solutions of the sampler sampling assembly of the utility model; the sampler sampling assembly Includes suction tips and metal needles. The above-mentioned automatic sampler can pre-set the volume of the insulating oil to be pipetted, and only need to release the button to absorb the insulating oil, and press the button to release the insulating oil in two steps. The accuracy of the insulating oil volume is greatly affected. The sampler sampling component is used to cooperate with the pipette gun to form the insulating oil pipetting and sampling device in the coulometric trace moisture determination process. The metal needle is used to pierce the coulometric trace moisture. Silicone pad at the inlet of the moisture analyzer for direct sample injection.

Description

Automatic sampler and sampler sampling components of coulometric trace moisture analyzer

technical field

The utility model belongs to the technical field of electric power testing, is applied to the micromoisture measurement by coulometric method, and particularly relates to an automatic sample injector and a sampling component of the sample injector. the

Background technique

At present, power systems mainly use coulometric moisture analyzers to measure trace moisture in insulating oil. In the process of trace moisture measurement, it is necessary to pipette the insulating oil. The 1mL glass syringe is the main tool for pipetting insulating oil. It is used to accurately pipette a certain volume of insulating oil, and then puncture the coulometric trace moisture analyzer to inject samples. The silicone gasket sealed at the mouth is injected into the electrolytic cell for testing. However, in actual operation, glass syringes have the following problems: the line of sight of the tester must be kept at the same level as the position of the syringe scale, otherwise the injection volume will be too high or too low; manual operation of glass syringes requires high proficiency , Even small vibrations such as breathing and pulse and the temperature transmitted by the needle tube may affect the amount of sample injection; air bubbles are easy to enter when pipetting oil samples; repeated use of syringes leads to cross-contamination between different samples. These factors will affect the accuracy of pipetting the volume of insulating oil, and it is difficult to keep the same sample volume each time, which will cause errors in the measured value of the insulating oil's trace moisture, which makes it difficult for the test personnel to conduct the insulating oil trace moisture analysis test. Time consuming. the

Utility model content

The technical problem to be solved by the utility model is to provide an automatic sampler and sampler sampling assembly of a coulometric trace moisture analyzer. The automatic sample injector of the coulometric trace moisture analyzer provided by the utility model can be set in advance It is easy to pipette the volume of the insulating oil. When it is necessary to pipette the insulating oil for a trace moisture analysis test in the oil, you only need to release the button to absorb the insulating oil and press the button to release the insulating oil. The operation is simple and convenient. It can effectively reduce the large influence of small deviations of human operation on the accuracy of pipetting the volume of insulating oil, so as to solve the problem that the existing glass syringe has a large error in the process of pipetting the volume of insulating oil and affects the measured value of the trace moisture of the insulating oil. the

The utility model also provides a sample injector sampling assembly, which is used to cooperate with a pipette gun to form a pipetting and sampling device for insulating oil in the process of coulometric moisture measurement, which solves the problem that the pipette gun cannot penetrate The problem of direct sample injection through the silica gel pad at the sample port of the coulometric trace moisture analyzer, and the replaceable design avoids cross-contamination between different samples. the

The technical scheme of the sample injector sampling assembly disclosed by the utility model is:

It includes a suction head and a metal needle, and the metal needle is composed of a socket and a hollow needle tube connected to the lower end of the socket. The socket part of the gun head, the lower end of the cavity is installed on the socket, and the suction head is respectively airtightly connected with the hollow needle tube and the gun head, so as to keep the communication between the hollow needle tube and the gun head.

The sampling assembly of the sampler is used to cooperate with the pipette gun to form the insulating oil pipetting and sampling device in the coulometric moisture determination process. The silica gel pad at the inlet of the coulometric moisture analyzer acts as a seal to prevent atmospheric The moisture in the water enters the electrolytic cell and affects the determination. Therefore, directly opening the silica gel pad for sampling is prohibited by the test. The metal needle of the sampling component of the sampler is used to pierce the silica gel pad of the inlet of the coulometric moisture analyzer. , which solves the problem that the pipette gun cannot pierce the silica gel pad at the sample inlet of the coulometric moisture analyzer, so that samples can be injected directly; In the medical field, the tip socket at the upper end of the tip is used to seal the connection between the cavity and the tip. The cavity is used to temporarily store the insulating oil to be tested sucked by the hollow needle tube. At the same time, the replaceable design avoids cross-contamination between different samples . the

Further, the cavity is a hollow conical tube, and the cavity wall is made of polypropylene plastic material, and the socket part of the gun head is a rubber cylinder with a diameter slightly larger than the gun head, which is socketed on the gun head. The hollow conical tube is a general-purpose liquid storage cavity, which is convenient for manufacturing and processing. The polypropylene plastic material is easy to form, cheap, and cost-saving. The rubber sleeve socket is a commonly used airtight connection method. the

Further, the sampling assembly of the injector also includes a rubber sealing ring, the sealing ring is matched with a gun head socket, the cavity is a hollow tapered tube, and the gun head socket includes a sleeve extending from the upper end of the cavity. A sleeve connected to the outside of the sealing ring, the top end of the sleeve bears against the lower end surface of the housing, and the sleeve extends along the lower end surface of the housing with a supporting end surface. The hollow conical tube is a general-purpose liquid storage cavity for easy manufacturing and processing. The main function of the above-mentioned structure design of the tip socket is to use the support end surface to bear the pressure transmitted to the tip by the metal needle when piercing the silicone pad, so as to avoid the breakage of the needle. The piercing efficiency is improved during use, and the operation is convenient, and the sealing ring made of rubber ensures the sealing between the suction head and the gun head. the

Further, the support end surface exceeds the edge of the lower end surface of the housing, and a housing sleeve that is socketed on the housing extends from the support end surface. The design of the shell sleeve is beneficial to prevent unstable installation and deflection of the supporting end face during use. the

Further, the suction head is integrally formed of stainless steel. The stainless steel material is stronger and more durable, and it is easier to pierce the silicone pad. the

Further, the capacity of the cavity is 1 mL. The capacity is set in accordance with the common liquid volume for coulometric trace moisture determination, which is the same as the original 1mL syringe capacity, which can prevent the pipette from entering the pipette and protect the pipette from cross-contamination of multiple injections. for the preferred volume setting. the

Further, the length of the metal needle is 7-9cm. The length of the metal needle is 7-9cm, which is the best size for piercing through the silica gel pad and extending into the electrolyte, which is convenient for use. the

The utility model also includes an automatic sample injector for a coulometric trace moisture measuring instrument. button, the bottom of the shell is the gun head, and the pipette is the existing technology commonly used in the field of biochemistry to quantitatively pipette water and biochemical reagents. It is only limited to this; it also includes any one of the injector sampling components in the technical solutions of the above-mentioned injector sampling components of the present invention installed on the gun head. the

The pipetting gun described in the above scheme uses the principle of spring kinetic energy potential energy conversion, piston movement and air displacement, and the spring is controlled by pushing the button. The spring pushes the piston, and the piston moves in a fixed range in the piston sleeve to generate negative pressure and absorb liquid. When pipetting insulating oil, adjust the measuring range according to the measured volume, press the push button, the spring is compressed, the piston moves downward, and the air in the suction head is discharged. Insert the needle into the insulating oil, slowly release the push button, the spring recovers, the piston moves upward, and negative pressure is generated in the suction head, the insulating oil is automatically sucked through the needle and stored in the sampling component of the autosampler, wipe it with absorbent paper Remove insulating oil that may adhere to the surface of the needle. When conducting trace moisture analysis of insulating oil, the needle is pierced through the silica gel pad at the inlet of the coulometric trace moisture analyzer, and then the push button is pressed to the bottom to release the insulating oil to the electrolytic cell, and then the trace moisture in the oil is analyzed by coulometric titration. Replace disposable tips before each test to avoid cross-contamination between different samples. the

The above-mentioned automatic sampler can pre-set the volume of the insulating oil to be pipetted. When it is necessary to pipette the insulating oil for a trace moisture analysis test in the oil, just release the button to absorb the insulating oil, and press the button to release the insulating oil in two steps. The operation is simple and convenient. It can effectively reduce the large influence of small deviations of human operation on the accuracy of pipetting the volume of insulating oil, so as to solve the problem that the existing glass syringe has a large error in the process of pipetting the volume of insulating oil and affects the measured value of the trace moisture of the insulating oil. Although the pipette gun wherein is the prior art, it is usually only used for reagent pipetting in the biochemical field. The reagents usually pipetted include water and biological reagents, which are seldom used for pipetting insulating oil. , especially the pipetting of insulating oil in coulometric micromoisture determination experiments is usually carried out with a syringe. The pad cannot be directly used for sampling of insulating oil. It can only be used for pipetting and sampling of insulating oil in coulometric micromoisture determination experiments in conjunction with the following sampling components of the sampler. A range of beneficial effects including accuracy. the

Description of drawings

Fig. 1 is the structural diagram of the embodiment 1 of the autosampler of coulometric trace moisture measuring instrument described in the utility model;

Fig. 2 is the structural diagram of embodiment 1 of sampling assembly of the injector described in the utility model;

Fig. 3 is a structural diagram of Embodiment 2 of the sampling assembly of the injector described in the present invention.

The marks in the attached drawings and the names of the corresponding components:

1-Push button 2-Piston rod 3-Shell 4-Piston 5-Spring 6-Tip removal button 7-Suction head 71-Cavity 72-Tip socket 721-Support end face 722-Shell sleeve 8-Metal needle 81 -socket 82-hollow needle tube 9-sealing ring

Detailed ways

The utility model will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto. the

The utility model also includes a sample injector sampling assembly, as shown in Fig. 2 and Fig. 3 respectively, embodiment 1 and embodiment 2 of the injector sampling assembly, its structure can be summarized as follows, including a suction head 7 and a metal needle 8, The metal needle 8 is composed of a socket 81 and a hollow needle tube 82 connected to the lower end of the socket. The suction head 7 includes a hollow cavity 71, and the top of the cavity 71 extends from the tip 31 of the socket pipette. The gun head sleeve part 72, the lower end of the cavity 71 is installed on the socket 81, and the suction head 7 is airtightly connected with the hollow needle tube 82 and the gun head 31 respectively, so as to keep the connection between the hollow needle tube and the gun head. the

The sampling assembly of the sampler is used to cooperate with the pipette gun to form the insulating oil pipetting and sampling device in the coulometric moisture determination process. The silica gel pad at the inlet of the coulometric moisture analyzer acts as a seal to prevent atmospheric The moisture in the water enters the electrolytic cell and affects the determination. Therefore, directly opening the silica gel pad for sampling is prohibited by the test. The metal needle of the sampling component of the sampler is used to pierce the silica gel pad of the inlet of the coulometric moisture analyzer. , which solves the problem that the pipette gun cannot pierce the silica gel pad at the sample inlet of the coulometric moisture analyzer, so that samples can be injected directly; In the medical field, the tip socket at the upper end of the tip is used to seal the connection between the cavity and the tip. The cavity is used to temporarily store the insulating oil to be tested sucked by the hollow needle tube. At the same time, the replaceable design avoids cross-contamination between different samples . the

As shown in Figure 2, the more specific structure of the first embodiment of the sampling assembly is that the cavity 71 is a hollow tapered tube, the cavity wall is made of polypropylene plastic material, and the diameter of the tip sleeve 72 is slightly larger than that of the tip. The rubber barrel is sleeved on the gun head 31. The hollow conical tube is a general-purpose liquid storage cavity, which is convenient for manufacturing and processing. The polypropylene plastic material is easy to form, cheap, and cost-saving. The rubber sleeve socket is a commonly used airtight connection method. the

As shown in Fig. 3, the more specific structure of Embodiment 2 of the sampling assembly is that the sampling assembly of the injector also includes a rubber sealing ring 9, the sealing ring 9 is socketed with the gun head 31, and the cavity 71 is Hollow conical tube, the gun tip sleeve portion 72 includes a socket sleeve extending from the upper end of the cavity 71 and sleeved outside the sealing ring 9, the top end of the socket sleeve withstands the lower end surface of the shell 3, and the socket sleeve A supporting end surface 721 extends along the lower end surface 32 of the housing. The hollow conical tube is a general-purpose liquid storage cavity for easy manufacturing and processing. The main function of the above-mentioned structure design of the tip socket is to use the support end surface to bear the pressure transmitted to the tip by the metal needle when piercing the silicone pad, so as to avoid the breakage of the needle. The piercing efficiency is improved during use, and the operation is convenient, and the sealing ring made of rubber ensures the sealing between the suction head and the gun head. the

As shown in FIG. 3 , the more specific structure of Embodiment 2 of the sampling assembly is that the support end surface 721 exceeds the edge of the lower end surface 32 of the casing, and a casing sleeve 722 that is sleeved on the casing 3 extends from the support end surface 721 . The design of the shell sleeve is beneficial to prevent unstable installation and deflection of the supporting end face during use. the

As shown in Fig. 3, the more specific structure of the sampling assembly Example 2 is that the metal needle 8 includes a socket 81, the hollow needle tube 82 is made of stainless steel, and the suction head 7 is integrally formed of stainless steel. The stainless steel material is stronger and more durable, and it is easier to pierce the silicone pad. the

In Examples 1 and 2 of the sampling assembly, the volume of the cavity 71 is 1 mL. The capacity is set in accordance with the common liquid volume for coulometric trace moisture determination, which is the same as the original 1mL syringe capacity, which can prevent the pipette from entering the pipette and protect the pipette from cross-contamination of multiple injections. for the preferred volume setting. In Examples 1 and 2 of the sampling assembly, the length of the metal needle 8 is 7-9 cm. The length of the metal needle is 7-9cm, which is the best size for piercing through the silica gel pad and extending into the electrolyte, which is convenient for use. the

Embodiment 1 of the automatic sample injector that the utility model comprises is, as shown in Figure 1, comprises pipette gun, and the parts in pipette gun comprise push button 1, piston rod 2, housing 3, piston 4, spring 5, Unloading tip button 6, the bottom end of housing 3 is gun head 31, and the pipetting gun is the existing technology that is commonly used in the biochemical field to quantitatively pipette water and biochemical reagents. The prior art should not be limited thereto; it also includes the sampler sampling assembly described in any one of the technical solutions of the above-mentioned injector sampling assembly of the utility model. the

The pipetting gun described in the above scheme uses the principle of spring kinetic energy potential energy conversion, piston movement and air displacement, and the spring is controlled by pushing the button. The spring pushes the piston, and the piston moves in a fixed range in the piston sleeve to generate negative pressure and absorb liquid. When pipetting insulating oil, adjust the measuring range according to the measured volume, press the push button, the spring is compressed, the piston moves downward, and the air in the suction head is discharged. Insert the needle into the insulating oil, slowly release the push button, the spring recovers, the piston moves upward, and negative pressure is generated in the suction head, the insulating oil is automatically sucked through the needle and stored in the sampling component of the autosampler, wipe it with absorbent paper Remove insulating oil that may adhere to the surface of the needle. When performing trace moisture analysis of insulating oil, the needle is pierced through the silica gel pad at the inlet of the coulometric trace moisture analyzer, and then the push button is pressed to the bottom to release the insulating oil to the electrolytic cell, and then the trace moisture in the oil is analyzed by coulometric titration. Replace disposable tips before each test to avoid cross-contamination between different samples. the

The volume of the liquid to be pipetted can be set in advance for the above-mentioned automatic sampler. When it is necessary to pipette the insulating oil for a trace moisture analysis test in the oil, you only need to release the button to absorb the insulating oil, and press the button to release the insulating oil in two steps. easy and convenient. It can effectively reduce the large influence of small deviations of human operation on the accuracy of pipetting the volume of insulating oil, thereby solving the problem that the large error in the process of pipetting the volume of insulating oil with the existing glass syringe affects the measured value of the trace moisture of the insulating oil. Although the pipette gun wherein is the prior art, it is usually only used for reagent pipetting in the biochemical field. The reagents usually pipetted include water and biological reagents, which are seldom used for pipetting insulating oil. , especially the pipetting of insulating oil in coulometric micromoisture determination experiments is usually carried out with a syringe. The pad cannot be directly used for sampling of insulating oil. It can only be used for pipetting and sampling of insulating oil in coulometric micromoisture determination experiments in conjunction with the following sampling components of the sampler. A range of beneficial effects including accuracy. the

The foregoing are the preferred embodiments of the present utility model. If the preferred implementations in each preferred embodiment are not obviously self-contradictory or based on a certain preferred implementation, each preferred implementation can be combined and used in any combination. , the embodiments and the specific parameters in the embodiments are only for clearly expressing the utility model verification process of the utility model, and are not used to limit the scope of patent protection of the utility model, and the scope of patent protection of the utility model is still defined by its claims The book shall prevail, and all equivalent structural changes made by using the description of the utility model and the contents of the accompanying drawings shall be included in the protection scope of the utility model in the same way. the

As mentioned above, the utility model can be better realized. the

Claims (8)

1. The sampler sampling assembly is characterized in that it includes a suction head (7) and a metal needle (8), and the metal needle (8) is composed of a socket (81) and a hollow needle tube (82) connected to the lower end of the socket, The tip (7) includes a hollow cavity (71), and the upper part of the cavity (71) extends a tip socket (72) for socketing the tip (31) of the pipette gun. The cavity The lower end of the body (71) is installed on the socket (81), and the suction head (7) is airtightly connected with the hollow needle tube (82) and the gun head (31) respectively, so as to keep the connection between the hollow needle tube and the gun head. 2. The sampling assembly of the injector according to claim 1, further characterized in that, the cavity (71) is a hollow conical tube, the cavity wall is made of polypropylene plastic material, and the tip socket (72) What is the diameter is larger than the rubber barrel sleeve of gun head on the gun head (31). 3. The sampling assembly of the injector according to claim 1, characterized in that the sampling assembly of the injector also includes a rubber sealing ring (9), and the sealing ring (9) matches the gun head (31) Socket, the cavity (71) is a hollow tapered tube, the gun tip socket (72) includes a sleeve extending from the upper end of the cavity (71) and socketed outside the sealing ring (9), the The top end of the sleeve bears against the lower end surface of the housing (3), and the sleeve extends along the lower end surface (32) of the housing with a supporting end surface (721). 4. The sampling assembly of the injector according to claim 3, further characterized in that, the support end surface (721) exceeds the edge of the lower end surface (32) of the housing, and the sleeve housing (32) extends on the support end surface (721). ) of the housing sleeve (722). the 5. The sampling assembly of the injector according to claim 3, further characterized in that, the suction head (7) is integrally formed of stainless steel. 6. The sampling assembly of the injector according to any one of claims 1-5, further characterized in that the volume of the cavity (71) is 1 mL. 7. The sampling assembly of the injector according to any one of claims 1-5, further characterized in that the length of the metal needle (8) is 7-9 cm. 8. The automatic sampler of the coulometric trace moisture analyzer, including the pipette gun, the parts in the pipette gun include push button (1), piston rod (2), housing (3), piston (4), spring ( 5), the button for unloading the tip (6), the bottom end of the shell (3) is the gun head (31), which is characterized in that it also includes a gun head (31) as described in any one of claims 1-5. Injector sampling components described above.