CN202083577U - Sealed sampler with dissolved oxygen probe - Google Patents

Abstract

The utility model discloses a sealed sampler with a dissolved oxygen probe. The sealed sampler comprises a cavity and the dissolved oxygen probe, wherein the cavity is provided with a water inlet and a water outlet, and is used for sealing and bearing pressure, the dissolved oxygen probe is fixed in the cavity, a gap is arranged between the dissolved oxygen probe and the inner wall of the cavity, a cable of the dissolved oxygen probe penetrates through the top of the cavity, the water inlet is arranged at the bottom of the cavity, and the water outlet is arranged at the top of the cavity. As the sealed design is adopted, water subjected to dissolved oxygen detection is prevented from decompression, and can be directly delivered into a pipe network; and moreover, sampled water is also prevented from being in contact with air, so that a more correct test result is ensured.

Description

A sealed sampler equipped with a dissolved oxygen probe

technical field

The utility model relates to the field of sampling equipment for on-line monitoring of water quality index dissolved oxygen in water supply pipelines, in particular to a sealed sampler equipped with a dissolved oxygen probe.

Background technique

Dissolved oxygen refers to molecular oxygen dissolved in water or solution, which is an indispensable condition for the survival of aquatic animals and aquatic plants. The dissolved oxygen in natural water is close to the saturation value. When the dissolved oxygen concentration is less than 3mg/L, the survival of fish will be affected. The reduction of dissolved oxygen in rivers, rivers and lakes is the main reason for the deterioration of water quality. The concentration of dissolved oxygen reflects the degree of water pollution, especially organic pollution. The determination of dissolved oxygen concentration is used in industry, medicine, environmental monitoring and aquaculture. It is one of the important indicators of the degree of water pollution.

The water transported to the user through the water supply network is closely related to human health, and dissolved oxygen is an important indicator of water quality. After being transported to the user terminal through the water supply network, the user uses the water for cooking, cooking and Drinking water is actually related to people's health and affects people's quality of life. Whether it is the monitoring of dissolved oxygen in the actual water supply network or in the simulated water supply network, it is very necessary.

In the prior art, when the waterworks detect the dissolved oxygen index of the outgoing water in the water supply pipeline, they all use the method of immersing the dissolved oxygen probe in the sampling water for detection, and then read the data through the connected transmitter. The dissolved oxygen probe used is commonly used, such as Hach’s dissolved oxygen probe, which is a long cylinder of about 15cm. Generally, the water sampler for the water supply pipeline is an open sampling water tank equipped with a branch connected to the water supply pipeline. The oxygen probe is placed in the water tank. If a dissolved oxygen probe such as Hach is used for detection, the water in the pipeline is drawn out through a small branch pipe and placed in an open water tank, and the probe is directly placed in the water tank for detection. Of course, there are water inlets and outlets in the water tank, and the water in the water tank always keeps the latest sampling water in the pipeline. However, since the water tank is open, it will come into contact with air, which will affect the dissolved oxygen index; at the same time, after the pressure is lost, the tested sampled water can only be wasted and drained. Therefore, there is a relatively large technical problem.

Contents of the invention

The utility model provides a sealed sampler equipped with a dissolved oxygen probe. Through the closed design, the water after the dissolved oxygen detection does not lose pressure, and can be directly circulated back to the water supply transportation pipe network. At the same time, the detection is also avoided. The water is in contact with the air, so that the water quality is not polluted and the test results are more correct.

A sealed sampler equipped with a dissolved oxygen probe, comprising a cavity with a water inlet and a water outlet for sealing pressure and a dissolved oxygen probe fixed in the cavity, the gap between the dissolved oxygen probe and the inner wall of the cavity There is a gap between them, the cable of the dissolved oxygen probe runs through the top of the chamber, the water inlet is located at the bottom of the chamber, and the water outlet is located at the top of the chamber.

In order to ensure the overall airtightness of the chamber, the chamber itself must be airtight, and the water outlet and water inlet of the chamber must also be connected to the water supply pipe network in a liquid-tight fit, and under the premise of airtightness, there must be no loss of pressure. This requires the cavity to be pressure-bearing. Generally, the water pressure in the water supply pipe network is between 3Mpa and 4Mpa, and the pressure of the cavity needs to be greater than 4Mpa. There is a gap between the dissolved oxygen probe and the inner wall of the cavity to ensure The incoming water samples that need to be detected can fully contact the dissolved oxygen probe, and ensure that the water samples can be smoothly circulated back to the water supply pipe network. The water inlet is located at the bottom of the cavity, and the water outlet is located at the top of the cavity, which is convenient for initialization. , the air in the sealed sampling container is discharged from the water outlet. During online detection, the sensor part of the dissolved oxygen probe (generally the dissolved oxygen sensor is located in the middle and lower part of the probe) is completely immersed in the sampling water, thus ensuring the accuracy of dissolved oxygen data detection. The received data is transmitted to the transmitter meter through the cable for display.

In order to reach the better utility model effect of the utility model, carry out further optimization:

The cavity is composed of an upper cavity and a lower cavity which are liquid-tightly matched. The combination of the upper chamber and the lower chamber is used to facilitate the installation of the dissolved oxygen probe. Since the chamber needs to pass water and ensure that the tested water sample does not lose pressure, the upper chamber and the lower chamber are required. The liquid-tight fit, the means to realize the liquid-tight fit can also adopt various methods, such as buckle, welding, etc., preferably, the upper cavity and the lower cavity cooperate with each other through threads, in order to increase the upper cavity and the lower cavity For the tightness of the cavity connection, a sealing gasket is provided between the upper cavity and the lower cavity.

In order to prevent the dissolved oxygen probe from being damaged due to its lack of fixation, the dissolved oxygen probe needs to be fixed, and the fixation can be made by making the cavity and the dissolved oxygen probe into one body. Preferably, the end of the dissolved oxygen probe connected with the cable passes through the fixing device fixed on the top of the cavity; the end of the dissolved oxygen probe connected with the cable is connected to the fixing device through a liquid-tight fit; the fixing device is connected to the cavity through a liquid-tight fit. The liquid sealing cooperation of the cavity, the fixing device and the cable end of the dissolved oxygen probe fully guarantees the overall sealing of the cavity, thereby providing favorable conditions for the utility model to realize that the water sample does not lose pressure after the dissolved oxygen detection.

The fixing device includes a T-shaped fixing frame with a rod passing through the top of the cavity and a lock nut threadedly engaged with the rod of the T-shaped fixing frame. The T-shaped fixing frame is provided with a through hole along its axial direction, The cable of the dissolved oxygen probe passes through the through hole. A sealing gasket is provided between the T-shaped fixing frame and the surface of the cavity. Generally, the end of the dissolved oxygen probe connected to the cable is a cylinder wrapped with the cable. The size of the cylinder is just matched with the through hole on the T-shaped fixing frame. The through hole of the T-shaped fixing frame can be threaded with the end of the dissolved oxygen probe connected to the cable. Mate connection.

Compared with the prior art, the utility model has the following advantages:

The utility model seals and fixes the dissolved oxygen probe in the pressure-bearing cavity, on the one hand, it ensures that the water to be tested is always in a closed environment, avoids contact with the air, and prevents secondary pollution of the air; In the process, the water to be tested entering the cavity has hydraulic pressure, and after passing through the sealed sampler equipped with dissolved oxygen probes, it can still ensure no loss of pressure, and can enter the water supply pipe network again, without wasting sampling water.

When the utility model is applied to the online detection of dissolved oxygen in the water quality simulation test system of the circulating water supply pipe network, it can further avoid the deviation of test data caused by supplementing a large number of fresh water samples to compensate for the loss of test water samples during the test system process.

The upper cavity and the lower cavity of the utility model adopt threaded cooperation with a sealing ring, which can facilitate the assembly and disassembly of the sealed sampler equipped with a dissolved oxygen probe and the sealed sampler equipped with a dissolved oxygen probe while ensuring sealing. overhaul.

The cable end of the dissolved oxygen probe of the utility model is fixed on the top by a fixing device, and the T-shaped fixing frame of the fixing device, the lock nut, the sealing washer and the cable end of the dissolved oxygen probe are well matched with each other, and the The dissolved oxygen probe is fixed and the wires attached to the dissolved oxygen probe are smoothly exported. On the one hand, the assembly and disassembly of the sealed sampler equipped with the dissolved oxygen probe is very convenient, and the replacement of the dissolved oxygen probe is also very convenient. On the other hand, the same It well realizes that the water to be tested does not lose pressure and ensures that the water to be tested is not subjected to secondary pollution by air.

The utility model sets the position of the water outlet and the water inlet of the water to be tested, which facilitates the discharge of the air in the sealed sampler equipped with the dissolved oxygen probe. The sampled water is in full contact with the dissolved oxygen probe to ensure the accuracy of the final dissolved oxygen data.

Description of drawings

Fig. 1 is a half-sectional view of a sealed sampler equipped with a dissolved oxygen probe of the present invention.

Detailed ways

As shown in Figure 1, it is a schematic diagram of a half-section structure of a sealed sampler equipped with a dissolved oxygen probe of the present invention. The sealed sampler equipped with a dissolved oxygen probe includes a cavity body provided with a water inlet 8 and a water outlet 9 and fixed in the cavity The dissolved oxygen probe 3 in the body (using the Hach LDO dissolved oxygen probe), the cavity can also be an integrally formed closed cavity. Considering factors such as installation and maintenance, the cavity adopts a cylindrical upper cavity 1 A combined cavity composed of a cylindrical lower cavity 2, the material of the upper cavity 1 and the lower cavity 2 can be acrylonitrile-styrene-butadiene copolymer (ABS) resin material, the upper cavity 1 The upper chamber 1 and the lower chamber 2 have an open end connected to each other. The connection between the upper chamber 1 and the lower chamber 2 should adopt a liquid-tight fit to ensure no water leakage and no loss of pressure. The liquid-tight fit can be threaded fit. The upper chamber The area of the opening end of 1 is slightly larger than the opening end of the lower cavity 2, and the inner wall of the opening end of the upper cavity 1 is provided with a thread and the outer wall of the opening end of the lower cavity 2 is provided with a thread that matches the thread of the upper cavity 1 Realize the liquid seal between the upper chamber 1 and the lower chamber 2, forming a sealed space that does not allow water to flow out. In order to further improve the sealing performance, a rubber gasket 4 is provided between the upper chamber 1 and the lower chamber 2, and the rubber gasket 4 passes through the lower chamber. The top surface of 2 presses the rubber gasket 4 against the inner wall of the upper chamber 1.

Another way to realize the thread fit between the upper chamber 1 and the lower chamber 2 is: the area of the opening end of the lower chamber 2 is slightly larger than the opening end of the upper chamber 1, and the inner wall of the opening end of the lower chamber 2 is provided with threads and The outer wall of the opening end of the upper chamber 1 is provided with a thread that matches the thread of the upper chamber 1 to realize the liquid seal between the upper chamber 1 and the lower chamber 2, forming a sealed space that does not allow water to flow out. In order to further improve the sealing performance, A rubber gasket 4 is provided between the upper chamber 1 and the lower chamber 2 , and the rubber gasket 4 is pressed against the inner wall of the lower chamber 2 through the top surface of the upper chamber 1 .

The dissolved oxygen probe 3 can be directly fixed on the top of the cavity by integral molding, and the cable of the dissolved oxygen probe is directly led out from the top surface of the cavity. It is fixed on the top of the cavity by a fixing device. The fixing device includes a T-shaped fixing frame 5 and a lock nut 6 that is threaded. Through hole (not marked), the area of this through hole is greater than the area of the cross-section of the bar 51 of the fixed mount 5, less than the area of the cross-section of the head 52 of the fixed mount 5, through the T-shaped fixed mount 5 and the locking The cooperation of the nut 6 enables the head 52 of the T-shaped fixing frame 5 to be effectively supported on the top of the upper chamber 1. There are two ways for the T-shaped fixing frame 5 to cooperate with the locking nut 6, one is the T-shaped fixing frame 5 The head 52 of one is on the outside of the cavity, and the lock nut 6 is on the inside of the cavity; the other is that the head 52 of the T-shaped fixing frame 5 is on the inside of the cavity, and the lock nut 6 is on the outside of the cavity. A rubber washer 7 is arranged between the T-shaped fixing frame 5 and the surface of the cavity to increase the sealing performance. The T-shaped fixed frame 5 is provided with a threaded through hole 53 along its axial direction, and one end 31 of the dissolved oxygen probe 3 connected with the cable 32 is a cylinder wrapped around the cable 32. The hole is matched, the dissolved oxygen probe 3 is connected with the cable 32 and one end 31 passes through the thread that is matched with the thread of the through hole 53 of the T-shaped fixing frame 5, and the dissolved oxygen probe 3 is connected with the cable 32 and one end 31 rolls. After the material is glued, the thread fit connection is carried out, and the cable 32 wrapped in the middle is also smoothly exported from the through hole 53 of the T-shaped fixing bracket 5 .

The position of the water inlet 8 is lower than the water outlet 9, which can ensure that the error between the detected dissolved oxygen data and the actual dissolved oxygen data is smaller. When the water inlet 8 is set at the bottom of the cavity, the water outlet 9 is set at the top of the cavity When other conditions remain unchanged, the accuracy of the detection data can be guaranteed to the greatest extent. The water inlet 8 and the water outlet 9 are respectively connected with a hose quick connector 11.

The water to be tested is connected to the water supply pipe network through the hose quick connector 10, monitored and analyzed by the dissolved oxygen probe 9, and the data is transmitted to the display instrument through the cable 32, and then goes out from the hose quick connector 11, and the water that goes out is still It can be returned to the circulating water supply pipeline network to avoid secondary pollution and pressure loss of the water to be tested.

Claims (8)

1. sealing sampler that dissolved oxygen probe is housed, it is characterized in that, comprise the cavity that is used for seal and pressure bearing that is provided with water inlet and water delivering orifice and be fixed in the interior dissolved oxygen probe of cavity, leave the space between described dissolved oxygen probe and the cavity inner wall, the cable penetration cavity top of described dissolved oxygen probe, described water inlet is positioned at the bottom of cavity, and described water delivering orifice is positioned at the top of cavity.

2. the sealing sampler that dissolved oxygen probe is housed according to claim 1 is characterized in that, described cavity is made up of upper cavity and lower chamber that liquid sealing cooperates.

3. the sealing sampler that dissolved oxygen probe is housed according to claim 2 is characterized in that described upper cavity and lower chamber cooperatively interact by screw thread.

4. the sealing sampler that dissolved oxygen probe is housed according to claim 2 is characterized in that, is provided with packing washer between described upper cavity and the lower chamber.

5. the sealing sampler that dissolved oxygen probe is housed according to claim 1 is characterized in that, cable one end that is connected with of described dissolved oxygen probe is fixed on the cavity top by stationary installation; Described dissolved oxygen probe be connected with cable one end and stationary installation is connected by liquid sealing; Described stationary installation and cavity are connected by liquid sealing.

6. the sealing sampler that dissolved oxygen probe is housed according to claim 5, it is characterized in that, described stationary installation comprise bar portion run through the cavity top T shape fixed mount and with the bar portion of T shape fixed mount set nut by threaded engagement, described T shape fixed mount is axially arranged with through hole along it, and the cable of described dissolved oxygen probe passes described through hole.

7. the sealing sampler that dissolved oxygen probe is housed according to claim 6 is characterized in that, the through hole of described T shape fixed mount is connected by threaded engagement with cable one end that is connected with of dissolved oxygen probe.

8. according to claim 6 or the 7 described sealing sampler that dissolved oxygen probe is housed, it is characterized in that, be provided with packing washer between the surface of described T shape fixed mount and cavity.

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