CN2166439Y

CN2166439Y - High precision accuracy differential BOD determinating instrument

Info

Publication number: CN2166439Y
Application number: CN 93215940
Authority: CN
Inventors: 郭朝勇
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-15
Filing date: 1993-06-15
Publication date: 1994-05-25
Anticipated expiration: 2003-06-15

Abstract

The utility model relates to a high precision differential pressure type BOD measuring instrument which is composed of a BOD sample culture bottle 1, a sealing cover 2, a flexible pipe interface cap 5, an atmospheric pressure reference pipe 7, a scale indication plate 8, a glass pipe 9, a connecting flexible pipe 10, etc. The high precision differential pressure type BOD measuring instrument is characterized in that the bottle mouth of the BOD sample culture bottle 1 is stuck with a plastic joint 3 with adhesive agent; the glass pipe 9 and the atmospheric pressure reference pipe 7 are connected with a U-shaped pipe. The utility model overcomes the disadvantages existing in the prior art that the bottle mouth of the culture bottle is easily damaged, and the seal is poor. The measuring precision can be enhanced.

Description

High precision accuracy differential BOD determinating instrument

The utility model belongs to a kind of environment monitor, particularly about the biochemical oxygen demand (BOD) analyzer of water pollution.

An important indicator of Environmental Water pollution monitoring is so-called biochemical oxygen demand (BOD) (BOD), for measuring this index, generally adopt differential pressure type BOD analyzer in the prior art, according to its measuring principle, influencing its physical factor of measuring precision generally has two, and the one, the seal degree and the internal volume error of totally-enclosed sample culturing system; The one, the sensitivity of differential pressure measurement system.And in the prior art, totally-enclosed sample culturing system comprises: glass BOD sample culturing bottle, hose connection cap and gland bonnet etc., with gland bonnet hose connection cap and glass culture flask bottleneck are compressed a sealing of formation sample culturing system, so require glass culture flask bottleneck smooth, smooth and regular, ridge is vertical etc., but as glassware, reach these and require relatively difficulty, particularly when scrubbing bottle, easily bottleneck is frustrated and collapse, the easier leakage that causes closed system has influenced the precision of measuring; The differential pressure measurement system comprises hose, glass bend pipe, atmospheric pressure reference pipe (being commonly called as the mercury bottle) and scale indicator board etc., glass tube is the L type with connecting of atmospheric pressure reference pipe, because there is an angle in the connecting mode of L type, make the constricted flow of mercury, also influenced the precision of measuring.

The purpose of this utility model is exactly at the problem in the above-mentioned prior art, and a kind of BOD sample culturing bottle of easy sealing is provided; Also the glass bend pipe is improved simultaneously.

The purpose of this utility model is achieved in that

A kind of high precision differential pressure type BOD analyzer, by BOD sample culturing bottle 1, gland bonnet 2, hose connection cap 5, formations such as atmospheric pressure reference pipe 7, scale indicator board 8, glass bend pipe 9 and hose 10 is characterized in that on the bottleneck of culture flask 1 with the bonding adapter of plastic 3 of bonding agent.

Because joint 3 is that plastics are made, make smooth, smooth and regular easily, then bonding with combining of glass bottle opening by bonding agent, guarantee sealing, particularly when scrubbing bottle, bottleneck is not easy to frustrate and collapses, and simultaneously the screw thread of adapter of plastic 3 can Precision Machining, guarantee and being sealed and matched of gland bonnet 2, realized the seal request of totally-enclosed sample culturing system.

Embodiment of the present utility model is described as follows in conjunction with the accompanying drawings together:

Fig. 1, be the structural representation of present embodiment.

High precision differential pressure type BOD analyzer as among the figure is bonded with adapter of plastic 3 on the bottleneck of BOD sample culturing bottle 1, and adapter of plastic 3 is provided with the interior ring 31 that blocks bottleneck, carbon dioxide absorption cup 6 also block be put in the ring 31 on; Hose connection cap 5 is pressed on the adapter of plastic 3 by gland bonnet 2, is provided with filter 4 between hose connection cap 5 and the culture flask 1; Hose 10 connects with glass bend pipe 9, and the lower end of glass bend pipe 9 connects with atmospheric pressure reference pipe 7, and the glass bend pipe of this connection place is U type pipe 91, be connected to atmospheric pressure reference pipe 7 under, to improve the sensitivity of measuring; Atmospheric pressure reference pipe 7 is provided with the transparent window 71 of spying out, so that whether sealing water is dry in the observation tube, prevents the mercury vapour contaminated environment.In addition, also indicate the mark 11 of its volume parameters on the BOD culture flask.

The high precision differential pressure type BOD analyzer of embodiment is work like this, the water sample and the aerobic microbiological of certain volume are put in the BOD sample culturing bottle 1, screwing hermetic lid 2, make the temperature and time intracellular metabolic of microorganism in regulation, in the consume water and the bottle in an airborne oxygen, the carbon dioxide that metabolism is emitted is then absorbed by the NaOH in the carbon dioxide absorption cup 6, just produced a negative pressure like this in the culture flask, connect with atmospheric pressure reference pipe 7 by adapting pipe 10 and glass bend pipe 9, mercury column in the glass bend pipe 9 is risen, and read the partial pressure of oxygen reduction, thereby calculate its oxygen utilization from scale indicator board 8.

Technique scheme of the present utility model is compared with the prior art: its dead band only is 133Pa, and existing technology is 400-532Pa, and its error of indication is less than 2.5%, and the error of indication of existing technology is 5%.

Claims

1, a kind of high precision differential pressure type BOD analyzer, constitute by BOD sample culturing bottle 1, gland bonnet 2, hose connection cap 5, atmospheric pressure reference pipe 7, scale indicator board 8, glass tube 9 and hose 10 etc., it is characterized in that on the bottleneck of BOD sample culturing bottle 1 with the bonding adapter of plastic 3 of bonding agent.

2, a kind of BOD analyzer as claimed in claim 1 is characterized in that the interior ring 31 that blocks bottleneck is arranged on the adapter of plastic 3.

3, a kind of BOD analyzer as claimed in claim 1 is characterized in that the glass tube 9 and the connection place of atmospheric pressure reference pipe 7 are U type pipe 91, be connected to atmospheric pressure reference pipe 7 under.

4, a kind of BOD analyzer as claimed in claim 1 is characterized in that being provided with filter 4 between hose connection 5 and the BOD sample culturing bottle 1.

5, a kind of BOD analyzer as claimed in claim 1 is characterized in that atmospheric pressure reference pipe 7 is provided with the transparent window 71 of spying out.

6, a kind of BOD analyzer as claimed in claim 1 is characterized in that BOD sample culturing bottle 1 is marked with the mark 11 of its volume parameters.