Nitrogen blowing needle assembly

Abstract

The utility model provides a nitrogen blowing needle assembly which comprises a mounting plate, a nitrogen blowing needle and a nitrogen blowing needle, the distribution strip is transversely arranged at one end of the bottom surface of the mounting plate, a plurality of L-shaped holes and a plurality of mounting seats are transversely formed in the distribution strip at intervals, each mounting seat is strip-shaped and is longitudinally arranged on the bottom surface of the mounting plate, a through hole is formed in each mounting seat, one end of each through hole is hermetically connected with a longitudinal opening of the corresponding L-shaped hole, and the other end of each through hole is closed; a plurality of vertical holes are distributed in the bottom surface of the mounting seat along the longitudinal direction, and filter discs are arranged in the vertical holes; the joint is in sealed connection with the vertical hole, and a connecting hole which is through up and down is formed in the joint; and the nitrogen blowing needle is communicated with the lower end of the connecting hole of the joint. According to the utility model, the filter disc is mounted, so that a certain gas buffer area is formed in the mounting seat, the gas is influenced by the resistance of the filter disc, and the gas flow at the outlet can be consistent with the gas flow velocity, thereby achieving the beneficial effects of easiness in use and replacement, small difference in nitrogen blowing parallelism and the like.

Description

Technical Field

[0001] The utility model relates to a concentrator, in particular to a parallel nitrogen blowing concentrator in a nitrogen blowing concentrator. Background Art

[0002] A nitrogen blowing concentrator is a commonly used device in a chemical laboratory. Usually, nitrogen is blown over the surface of a heated liquid sample to quickly volatilize the sample, so as to achieve the purpose of quickly concentrating the sample. It has the characteristics of time saving, convenient operation, and easy control. It is widely used in sample preparation in industries such as pesticide residue analysis, commodity inspection, food, environment, pharmacy, and biological products.

[0003] The nitrogen blowing concentrator usually uses a water bath for heating, and introduces an inert gas nitrogen through a nitrogen blowing needle to blow over the surface of the liquid sample. The nitrogen blowing needle is usually made of a stainless steel tube and is arranged in a circular or matrix shape, and can process multiple samples simultaneously. Due to the different capacities of the sample containers, when arranged in a matrix shape, the row spacing or column spacing of the nitrogen blowing needles should be quickly adjustable. In addition, in the arrangement and application, when the number of samples is different and the workstations cannot be fully occupied, the positions without samples can be quickly blocked and this position can be deactivated. In actual work, it is required that the nitrogen blowing efficiency should be consistent, that is, under the same working conditions, the remaining volume reached should be the same or remain in a small range. This is the key to the design of this type of instrument.

[0004] Regarding the problem of nitrogen blowing parallelism, in the prior art, experimental testing of actual parallelism or segmented nitrogen blowing needles are usually adopted. Experimental testing of actual parallelism is a process-based solution, that is, by actually testing the parallelism, classifying and selecting the concentration needles, and testing again. This method wastes a lot of manpower and material resources; another method is to adopt a segmented design, such as the design disclosed in the utility model patent CN205749088U for a parallel nitrogen blowing needle group, which uses two different needle tubes for welding. After the gas is buffered in the large inner diameter section, the gas flows out through the small inner diameter section. Although this method improves the actual nitrogen blowing parallelism to a certain extent, the qualified rate of the welding process is low and the processing process is complex. Therefore, subsequent processes are still required for testing and evaluation, which is not the optimal solution. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a nitrogen blowing needle assembly, reduce its process difficulty and processing cost, and solve the problem of nitrogen blowing parallelism.

[0006] In addition, on the basis of the above, the utility model also intends to solve the requirements for different spacings of different containers, and solve the problem of easy operation of blocking the nitrogen blowing needles when some concentration positions are not used.

[0007] The technical solution adopted by the utility model is as follows:

[0008] A nitrogen blowing needle assembly, characterized in that it comprises:

[0009] A mounting plate, arranged horizontally;

[0010] A distribution bar, arranged transversely at one end of the bottom surface of the mounting plate, with a plurality of L-shaped holes arranged at intervals in the transverse direction. Each L-shaped hole has a vertical opening and a longitudinal opening, and the vertical opening is connected to a quick connector;

[0011] A plurality of mounting seats corresponding to the positions of the plurality of L-shaped holes. Each mounting seat is strip-shaped and arranged longitudinally on the bottom surface of the mounting plate. The mounting seat has a through hole, one end of the through hole is hermetically connected to the longitudinal opening of the L-shaped hole, and the other end is closed. A plurality of vertical holes are machined longitudinally on the bottom surface of the mounting seat, and the plurality of vertical holes are all communicated with the through hole, and filter sheets are arranged in the vertical holes;

[0012] A connector, hermetically connected to the vertical hole, and there is a through hole penetrating up and down inside the connector;

[0013] A nitrogen blowing needle, communicated with the lower end of the through hole of the connector.

[0014] For the nitrogen blowing needle assembly described above, wherein the middle part of the connector has an external hexagonal shape, and the bottom of the connector has a radially enlarged plane.

[0015] For the nitrogen blowing needle assembly described above, wherein one end of each vertical hole connected to the through hole of the mounting seat has a smaller diameter for tightly fitting the installation of the filter sheet, and the other end of the vertical hole has a larger diameter and is hermetically connected to the upper end of the connector through a thread.

[0016] For the nitrogen blowing needle assembly described above, wherein the nitrogen blowing needle is tubular, with a stepped shaft machined at the upper end and a conical shape at the lower end; the stepped shaft of the nitrogen blowing needle is tightly fitted and connected to the lower end of the through hole of the connector.

[0017] For the nitrogen blowing needle assembly described above, wherein the longitudinal opening is a smooth hole, and a sealing ring is arranged in the smooth hole. One end of the mounting seat is provided with a smooth shaft and forms a sealed connection with the smooth hole of the L-shaped hole through the sealing ring.

[0018] For the nitrogen blowing needle assembly described above, wherein a plurality of pin shafts are fixedly protruded downward at the other end of the bottom surface of the mounting plate. The plurality of pin shafts are opposite to the positions of the plurality of L-shaped holes, and the downward ends of the pin shafts are radially enlarged and in a stepped shape;

[0019] A variable-width groove is provided on the top surface of the other end of each mounting seat. The variable-width groove has a groove width that varies longitudinally for forming a mating connection with the pin shaft.

[0020] For the nitrogen blowing needle assembly described above, wherein the other end of the through hole is machined with internal threads for installing a needle group plug to close the other end of the through hole.

[0021] The nitrogen blowing needle assembly described above, wherein the lower end of the joint has an external thread for sealing connection with the needle plug; the lower end of the connection hole is a tapered hole that expands outward, and a tapered protrusion matching the tapered hole is machined at the center position of the needle plug, and an internal thread matching the external thread of the joint is also machined.

[0022] The nitrogen blowing needle assembly described above, wherein a mounting hole is machined at one end of the bottom of the mounting base away from the longitudinal opening, and a pull pin is mounted in the mounting hole by means of threading or a tight fit.

[0023] The nitrogen blowing needle assembly described above, wherein the quick connector vertically penetrates the mounting plate.

[0024] Since the filter is installed in the present utility model, a certain gas buffer zone is formed in the mounting base by the filter. Affected by the resistance of the filter, the gas flow rate and gas velocity at the outlet can be kept consistent, thus achieving beneficial effects such as easy use and replacement, and small difference in nitrogen blowing parallelism.

[0025] In addition, the distance between the distribution bar and the components on the mounting plate can be customized according to the container size to meet the requirements of different distances. Description of the Drawings

[0026] Figure 1 is a three-dimensional view of the overall structure of the present utility model.

[0027] Figure 2 is Figure 1 the side view of

[0028] Figure 3 is a longitudinal sectional view of the overall structure of the present utility model.

[0029] Figure 4 is a sectional view of the combined structure of the distribution bar and the mounting plate.

[0030] Figure 5 is a sectional view of the combined structure of the mounting base and its accessories.

[0031] Figure 6 is Figure 5 the partial enlarged view of

[0032] Figure 7 is the bottom view of the mounting base.

[0033] Figure 8 is the top view of the mounting base.

[0034] Description of the reference numerals: mounting plate 11; distribution bar 12; sealing ring 13; quick connector 14; pin 15; mounting base 21; optical axis 211; variable-width groove 212; needle group plug 22; filter 23; joint 24; nitrogen blowing needle 25; needle plug 26; pull pin 27. Detailed implementation mode

[0035] As Figures 1-8 shown, the utility model provides a nitrogen blowing needle assembly, including:

[0036] The mounting plate 11 is arranged horizontally and serves as a bearing foundation;

[0037] The distribution bar 12 is arranged transversely at one end of the bottom surface of the mounting plate 11. A plurality of L-shaped holes are arranged at intervals in the transverse direction (the interval can be customized according to different requirements of the container). Each L-shaped hole has a vertical opening and a longitudinal opening. The vertical opening is connected to a quick connector 14 vertically passing through the mounting plate 11. The longitudinal opening is a light hole, and a sealing ring 13 is arranged in the light hole;

[0038] A plurality of pin nails 15 opposite to the positions of the plurality of L-shaped holes are fixedly arranged at the other end of the bottom surface of the mounting plate 11 protruding downward. The downward end of the pin nail 15 radially expands to be stepped (or called T-shaped);

[0039] A plurality of mounting seats 21 opposite to the positions of the plurality of L-shaped holes. Each mounting seat 21 is strip-shaped and arranged longitudinally on the bottom surface of the mounting plate 11. One end of each mounting seat 21 is provided with a smooth shaft 211 and forms a sealed connection with the light hole of the L-shaped hole through the sealing ring 13. The top surface of the other end of each mounting seat 21 is provided with a variable-width groove 212. The variable-width groove 212 has a groove width that changes longitudinally for forming a mating connection with the pin nail 15; Before the smooth shaft 211 and the light hole are completely connected, the wider part of the variable-width groove 212 of the mounting seat 21 supplies the end of the pin nail 15 to enter. While the smooth shaft 211 and the light hole are completely connected, the end of the pin nail 15 enters the narrower part of the variable-width groove 212 of the mounting seat 21 and is longitudinally stuck and cannot be pulled out;

[0040] The mounting seat 21 has a through hole inside. One end of the through hole is communicated with the light hole of the L-shaped hole, and the other end is processed with internal threads to install the needle group plug 22, making the through hole a blind hole;

[0041] A plurality of vertical holes are processed longitudinally on the bottom surface of the mounting seat 21 (vertical holes with different pitches can be processed according to the size of the container). One end of each vertical hole connected to the through hole of the mounting seat 21 has a smaller diameter for tightly fitting the filter disc 23 to be installed. The other end of the vertical hole has a larger diameter and is hermetically connected to the upper end of the joint 24 through threads;

[0042] There is a connecting hole inside the joint 24 for hermetically connecting with the nitrogen blowing needle 25; For the convenience of plugging and unplugging, the middle part of the joint 24 has an external hexagonal shape, and the bottom of the joint 24 has a radially expanded plane;

[0043] The nitrogen blowing needle 25 is tubular, with a stepped shaft machined at the upper end and a conical shape at the lower end; the stepped shaft of the nitrogen blowing needle 25 is tightly and fittingly connected to the lower end of the connection hole of the connector 24.

[0044] In addition, the lower end of the connector 24 has an external thread for sealing connection with the needle plug 26; the lower end of the connection hole is a tapered hole that expands outward, and a tapered protrusion matching the tapered hole is machined at the central position of the needle plug 26, and an internal thread matching the external thread of the connector 24 is also machined. After removing the nitrogen blowing needle 25, when the needle plug 26 is screwed onto the connector 24, the tapered protrusion cooperates with the tapered hole to close the gas path of the connector 24.

[0045] Moreover, an installation hole (not communicating with the through hole inside the mounting seat 21) is machined at one end of the bottom of the mounting seat 21 away from the light hole, and a pull pin 27 is installed by means of threading or tight fitting. The pull pin 27 can be used for operations such as removing and replacing the nitrogen blowing needle 25 group.

[0046] When assembling the present utility model, the sealing ring 13 and the quick connector 2414 are respectively installed into the L-shaped holes of the distribution strip 12, and the distribution strip 12 is fixed to the mounting plate 11; a shaft pin is installed at the corresponding position of the mounting plate 11;

[0047] The pull pin 27 is installed into the installation hole of the mounting seat 21, and the filter disc 23 is pressed into the vertical hole of the mounting seat 21;

[0048] The nitrogen blowing needle 25 is installed onto the connector 24, and the connector 24 is installed into the vertical hole of the mounting seat 21 and tightened for sealing;

[0049] According to the sample position, the connector 24 at the position where concentration is not to be performed is blocked by using the needle plug 26 as needed; it should be noted that usually, the concentrator can control whether a group of nitrogen blowing needles 25 are ventilated by controlling the on-off of the solenoid valve. Therefore, when there are no samples in the entire group of nitrogen blowing needles 25, there is no need for blocking;

[0050] Align the optical axis 211 of the mounting seat 21 with the light hole of the distribution strip 12 and insert it. After contacting the sealing ring 13, slightly lift the mounting seat 21 upward. The pin 15 enters the widened groove 212 of the mounting seat 21, and continue to push it inward to lock the optical axis 211 with the light hole, and lock the widened groove 212 of the mounting seat 21 with the pin 15, so that the mounting seat 21 cannot fall off. The elasticity of the sealing ring 13 and the resulting frictional force can prevent the optical axis 211 from slipping out under the use pressure.

[0051] Since the present utility model is equipped with the filter disc 23, the filter disc 23 forms a certain gas buffer zone inside the mounting seat 21. Affected by the resistance of the filter disc 23, the gas flow rate and gas velocity at the outlet can be kept consistent, thus achieving beneficial effects such as easy use and replacement, and small difference in nitrogen blowing parallelism.

Claims

1. A nitrogen blow needle assembly, characterized in that: include: The mounting plate is arranged horizontally; A distribution strip is arranged at one end of the bottom surface of the mounting plate in the transverse direction, and has a plurality of L-shaped holes arranged at intervals in the transverse direction, each L-shaped hole has a vertical opening and a longitudinal opening, and the vertical opening is connected to a quick-connect connector; A plurality of mounting seats located opposite to the plurality of L-shaped holes, each mounting seat being strip-shaped and arranged longitudinally on the bottom surface of the mounting plate, a through hole being provided inside the mounting seat, one end of the through hole being sealed and connected to the longitudinal opening of the L-shaped hole, and the other end being closed, a plurality of vertical holes being arranged longitudinally on the bottom surface of the mounting seat, the plurality of vertical holes being connected to the through hole, and a filter disc being arranged in the vertical hole; A joint is sealed and connected to the vertical hole, and has a connecting hole extending vertically therein; A nitrogen blowing needle is connected with the lower end of the connecting hole of the joint.

2. The nitrogen blow needle assembly according to claim 1, characterized in that: The middle part of the joint is an outer hexagonal shape, and the bottom of the joint is provided with a radially enlarged plane.

3. The nitrogen blow needle assembly according to claim 1, characterized in that: One end of each vertical hole connected to the through hole of the mounting seat has a smaller diameter for the filter disc to be installed in a tight fit, and the other end of the vertical hole has a larger diameter and is sealed and connected to the upper end of the joint through threads.

4. The nitrogen blow needle assembly according to claim 1, characterized in that: The nitrogen blowing needle is tubular, with a stepped shaft processed on the upper end and a conical lower end; the stepped shaft of the nitrogen blowing needle is tightly matched and connected with the lower end of the connecting hole of the joint.

5. The nitrogen blow needle assembly according to claim 1, characterized in that: The longitudinal opening is a light hole, a sealing ring is arranged in the light hole, an optical axis is provided at one end of the mounting seat and a sealing connection is formed with the light hole of the L-shaped hole through the sealing ring.

6. The nitrogen blow needle assembly according to claim 1, characterized in that: A plurality of pins are fixed on the other end of the bottom surface of the mounting plate so as to protrude downward, the plurality of pins are opposite to the plurality of L-shaped holes, and the downward ends of the pins are radially enlarged to be stepped; A variable width groove is provided on the top surface of the other end of each mounting seat. The variable width groove has a groove width that varies along the longitudinal direction and is provided to form a matching connection with the pin.

7. The nitrogen blow needle assembly according to claim 1, characterized in that: The other end of the through hole is processed with an internal thread to install a needle group plug to close the other end of the through hole.

8. The nitrogen blow needle assembly according to claim 1, characterized in that: The lower end of the connector has an external thread for sealing connection with a needle plug; the lower end of the connection hole is an outwardly expanded conical hole, the center of the needle plug is processed with a conical protrusion matching the conical hole, and is also processed with an internal thread matching the external thread of the connector.

9. The nitrogen blow needle assembly according to claim 1, characterized in that: A mounting hole is processed at one end of the bottom of the mounting seat away from the longitudinal opening, and a pull pin is installed in the mounting hole by using a thread or a tight fit.

10. The nitrogen blow needle assembly according to claim 1, characterized in that: The quick-connect connector passes vertically through the mounting plate.

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