VOCs standard substance preparation device

Abstract

The utility model relates to a VOCs standard substance preparation device which comprises a pipetting cup, the bottom of the pipetting cup is conical, the bottom of the pipetting cup is fixedly communicated with a bottom pipe, an annular column is arranged in the middle of the bottom pipe, a cylinder capable of moving up and down is arranged in the annular column, an opening of the cylinder faces downwards, and a through hole is formed in the side face of the top of the cylinder. A connecting rod is fixed to the outer side of the annular column. The device is placed above a weighing container, VOCs compound raw materials are firstly poured into the pipetting cup of the device, the raw materials in the pipetting cup can enter the sliding pipe through the bottom pipe and are discharged into the weighing container through the bottom of the sliding pipe, and when the raw materials in the weighing container are about to reach a preset amount, the sliding pipe moves upwards, so that the VOCs compound raw materials can be weighed. The bottom pipe is blocked through the sliding pipe and the edge, the cylinder is made to move upwards, the through hole is made to communicate with the interior of the bottom pipe, raw materials in the bottom pipe can enter the cylinder through the through hole to be discharged into the weighing container, and small-flow discharging is conducted through the cylinder.

Description

TECHNICAL FIELD

[0001] The utility model relates to VOCs standard substance technology, especially a VOCs standard substance preparation device. BACKGROUND

[0002] The preparation of volatile organic compound series standard substance can improve the environmental monitoring technical level of China, provide more scientific and accurate support for environmental protection and human health, and promote green and sustainable development.

[0003] When preparing the volatile organic compound series standard substance, first, high-purity and pollution-free VOCs compounds are selected as raw materials, advanced purification technologies such as multi-stage distillation and chromatographic separation are used to ensure the purity of the raw materials, and then a measuring instrument is used to accurately prepare VOCs standard substances of different concentrations to ensure accurate concentration and uniform components.

[0004] At present, when preparing VOCs standard substance, it is not convenient to accurately control the amount of the weighed raw material during the accurate weighing and transfer of the raw material, and it is easy to weigh too much or too little, so there is a certain limitation, therefore, the utility model provides a VOCs standard substance preparation device which is convenient for accurately transferring the raw material during weighing to meet the existing needs. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a VOCs standard substance preparation device, which is used to solve the problem that it is not convenient to accurately control the amount of the weighed raw material during the accurate weighing and transfer of the raw material, and it is easy to weigh too much or too little.

[0006] In order to solve the above problems, the utility model provides a VOCs standard substance preparation device, which comprises a transfer pipette, the bottom of the transfer pipette is conical, a bottom pipe is fixedly connected to the bottom of the transfer pipette, an annular column is arranged in the middle of the bottom pipe, a cylinder which can move up and down is arranged in the annular column, the opening of the cylinder faces downward, a through hole is arranged in the side surface of the top of the cylinder, a connecting rod is fixed to the outside of the annular column, the free end of the connecting rod is fixedly connected with the inner wall of the bottom pipe, a sliding pipe is arranged in the bottom pipe, an edge is arranged at the top of the sliding pipe, the edge is in contact with the inner wall of the bottom pipe, and the sliding pipe can be sleeved on the annular column.

[0007] The VOCs standard substance preparation device provided by the utility model also has the following technical features:

[0008] Further, a thin pipe is arranged in the sliding pipe, the top of the thin pipe can abut against the bottom of the cylinder, a support rod is fixed to the outside of the thin pipe, the free end of the support rod is fixedly connected with the inner wall of the sliding pipe, and the thin pipe can be in communication with the inside of the cylinder.

[0009] Further, the annular column is provided with an annular groove, and a base plate located in the annular groove is fixed to the outer side of the cylinder.

[0010] Further, the bottom end of the thin tube extends out of the bottom of the sliding tube.

[0011] Further, the position height of the top end of the thin tube is lower than the position height of the upper surface of the sliding tube.

[0012] Further, the bottom end of the sliding tube extends out of one end of the bottom tube and is fixed with a support plate, and the outer side of the support plate is fixed with a screw sleeve which is threadedly connected with the outer side of the bottom tube.

[0013] The device has the following beneficial effects: the device is placed above the weighing container, the VOCs compound raw material is first poured into the pipette of the device, the raw material in the pipette can enter the sliding tube through the bottom tube, and is discharged into the weighing container through the bottom of the sliding tube; when the raw material in the weighing container is about to reach the predetermined amount, the sliding tube is moved upward, the bottom tube is blocked by the sliding tube and the edge, and the cylinder is moved upward, so that the through hole is communicated with the bottom tube, the raw material in the bottom tube can enter the cylinder through the through hole and be discharged into the weighing container, small flow discharge is realized through the cylinder, the amount of discharged material is accurately controlled, the amount of weighed raw material is accurately controlled, and overweighing or underweighing is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a perspective view of the embodiment of the utility model;

[0015] Figure 2 is a main view of the broken section of the embodiment of the utility model;

[0016] Figure 3 is a structure schematic view of the embodiment of the utility model in which the bottom tube is blocked and closed;

[0017] Figure 4 is the structure schematic view of the embodiment of the utility model Figure 2 in which A is enlarged; DETAILED DESCRIPTION

[0018] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0019] For example, Figures 1 to 4In the embodiment of the VOCs standard substance preparation device shown in the utility model, the VOCs standard substance preparation device comprises a transfer pipette 1, the bottom of the transfer pipette 1 is conical, a bottom pipe 2 is fixedly connected to the bottom of the transfer pipette 1, an annular column 3 is arranged in the middle of the bottom pipe 2, a cylinder 4 that can move up and down is arranged in the annular column 3, the opening of the cylinder 4 faces downward, a through hole 5 is arranged in the side of the top of the cylinder 4, a connecting rod 6 is fixed to the outside of the annular column 3, the free end of the connecting rod 6 is fixedly connected to the inner wall of the bottom pipe 2, a sliding pipe 7 is arranged in the bottom pipe 2, an edge 8 is arranged at the top of the sliding pipe 7, the edge 8 is in contact with the inner wall of the bottom pipe 2, and the sliding pipe 7 can be sleeved on the annular column 3.When the purified VOCs compound raw material is weighed and accurately prepared into VOCs standard substances with different concentrations, a certain amount of VOCs compound raw material needs to be weighed, the existing raw material transfer device for pouring the VOCs compound raw material into a weighing container is not convenient to adjust the discharging flow rate, which can easily result in overweighing or underweighing, and the utility model places the device above the weighing container, pours the VOCs compound raw material into the transfer pipette 1 of the device first, the raw material in the transfer pipette 1 can enter the sliding pipe 7 through the bottom pipe 2 and be discharged into the weighing container through the bottom of the sliding pipe 7, when the raw material in the weighing container is about to reach the predetermined amount, the sliding pipe 7 is moved upward, the bottom pipe 2 is blocked by the sliding pipe 7 and the edge 8, the cylinder 4 is moved upward, the through hole 5 is in communication with the bottom pipe 2, the raw material in the bottom pipe 2 can enter the cylinder 4 through the through hole 5 and be discharged into the weighing container, the small-flow discharging is realized through the cylinder 4, so that the amount of discharged raw material can be accurately controlled, and the amount of weighed raw material can be accurately controlled, thereby avoiding overweighing or underweighing.

[0020] In an embodiment of the present application, preferably, a thin pipe 9 is arranged in the sliding pipe 7, the top of the thin pipe 9 can abut against the bottom of the cylinder 4, a support rod 10 is fixed to the outside of the thin pipe 9, the free end of the support rod 10 is fixedly connected to the inner wall of the sliding pipe 7, the thin pipe 9 can be in communication with the inside of the cylinder 4, the upward movement of the sliding pipe 7 can drive the thin pipe 9 to move upward and abut against and communicate with the bottom of the cylinder 4, the upward movement of the cylinder 4 is driven, the through hole 5 is in communication with the bottom pipe 2, and the raw material in the cylinder 4 can be discharged into the weighing container through the thin pipe 9.

[0021] In an embodiment of the present application, preferably, an annular groove is arranged in the annular column 3, a backing plate 11 is fixed to the outside of the cylinder 4 in the annular groove, the upper side of the backing plate 11 is connected to the annular column 3 through a spring, so that when the thin pipe 9 moves downward, the cylinder 4 can be reset under the action of the spring.

[0022] In an embodiment of the present application, preferably, the bottom end of the thin pipe 9 protrudes from the bottom of the sliding pipe 7, so that the small-flow raw material can be discharged from the bottom end of the thin pipe 9.

[0023] In one embodiment of the present application, preferably, the position height of the top end of the thin tube 9 is lower than the position height of the upper surface of the sliding tube 7, so as to facilitate the sealing of the bottom tube 2 by the sliding tube 7 and the edge 8, and the device is in a closed state when the thin tube 9 is not in contact with the bottom of the cylinder 4, and the raw material cannot flow.

[0024] In one embodiment of the present application, preferably, the bottom of the sliding tube 7 is fixed with a support plate 12 at one end of the bottom tube 2, the outer side of the support plate 12 is fixed with a screw sleeve 13, the screw sleeve 13 is screwed with the outer side of the bottom tube 2, and the sliding tube 7 can be moved up and down by rotating the screw sleeve 13.

[0025] In use, the device can be placed above the weighing container through the bracket structure, the VOCs compound raw material is first poured into the pipette 1 of the device, the raw material in the pipette 1 can enter the sliding tube 7 through the bottom tube 2, and is discharged into the weighing container through the bottom of the sliding tube 7, when the raw material in the weighing container is about to reach the predetermined amount, the screw sleeve 13 can drive the sliding tube 7 to move upward, the sliding tube 7 and the edge 8 seal the bottom tube 2, the thin tube 9 moves upward with the sliding tube 7, and the thin tube 9 is in contact with the bottom of the cylinder 4 and communicates, the cylinder 4 is driven to move upward, the through hole 5 communicates with the bottom tube 2, the raw material in the bottom tube 2 can enter the cylinder 4 through the through hole 5, and the raw material in the cylinder 4 can be discharged into the weighing container through the thin tube 9, so that the small flow discharge is realized through the cylinder 4 and the thin tube 9, thereby facilitating the accurate control of the amount of discharged material, and further facilitating the accurate control of the amount of weighed raw material, and avoiding overweighing or underweighing, when the amount is sufficient, the device is moved to one side, and the screw sleeve 13 is rotated, so that the sliding tube 7 and the thin tube 9 move downward, so that the device is in a state that the sliding tube 7 and the edge 8 seal the bottom tube 2, and the thin tube 9 is not in contact with the bottom of the cylinder 4, at this time, the device is closed.

[0026] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A VOCs standard substance preparation device, comprising a pipette (1), characterized in that, The bottom of the pipette (1) is conical. The bottom of the pipette (1) is fixedly connected to the bottom tube (2). The middle part of the bottom tube (2) is provided with an annular column (3). Inside the annular column (3) is a cylinder (4) that can move up and down. The opening of the cylinder (4) faces downward. A through hole (5) is opened on the side of the top of the cylinder (4). A connecting rod (6) is fixed on the outside of the annular column (3). The free end of the connecting rod (6) is fixedly connected to the inner wall of the bottom tube (2). A sliding tube (7) is provided inside the bottom tube (2). The top of the sliding tube (7) is provided with an edge (8). The edge (8) contacts the inner wall of the bottom tube (2). The sliding tube (7) can be fitted onto the annular column (3).

2. The VOCs standard substance preparation apparatus according to claim 1, characterized in that: The sliding tube (7) is provided with a thin tube (9), the top of the thin tube (9) can abut against the bottom of the cylinder (4), a support rod (10) is fixed on the outside of the thin tube (9), the free end of the support rod (10) is fixedly connected to the inner wall of the sliding tube (7), and the thin tube (9) can communicate with the inside of the cylinder (4).

3. The VOCs standard substance preparation apparatus according to claim 2, characterized in that: The annular column (3) has an annular groove inside, and a pad (11) located in the annular groove is fixed on the outside of the cylinder (4). The upper side of the pad (11) is connected to the annular column (3) via a spring.

4. The VOCs standard substance preparation apparatus according to claim 2, characterized in that: The bottom end of the thin tube (9) extends out of the bottom of the sliding tube (7).

5. The VOCs standard substance preparation apparatus according to claim 2, characterized in that: The height of the top of the thin tube (9) is lower than the height of the upper surface of the sliding tube (7).

6. The VOCs standard substance preparation apparatus according to claim 1, characterized in that: The bottom of the sliding tube (7) is fixed with a support plate (12) extending out of the bottom tube (2). A screw sleeve (13) is fixed on the outside of the support plate (12). The screw sleeve (13) is threadedly connected to the outside of the bottom tube (2).

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