CN217443227U - Dissolubility total solid TDS probe - Google Patents

Abstract

This patent relates to a total solid TDS probe of solubility, includes: the probe comprises a probe, a probe support, a shell, a circular tube terminal, a wire, a terminal, a connector, a sheath, an insulating sleeve, epoxy resin and a thermistor. The utility model discloses a manufacturing process is: firstly, manufacturing a probe into a probe support, then reliably connecting the probe support, the thermistor and a wire, then filling the probe support, the thermistor and the wire into a shell, and then encapsulating epoxy resin to realize the first waterproof sealing of the probe; and then the electric wire at the tail part of the probe is encapsulated by a low-pressure injection molding process, so that secondary sealing is realized, and the purposes of centering the electric wire and beautifying the appearance are achieved. The utility model discloses a through twice sealed, thoroughly eliminate TDS probe infiltration hidden danger; meanwhile, the detection of two indexes of TDS and temperature is integrated to the adjacent position of one device, so that the temperature compensation of the detected TDS value is realized, the detection precision is improved, the installation space is saved, and the labor intensity is reduced.

Description

Dissolubility total solid TDS probe

Technical Field

The patent relates to the technical field of water quality testing, in particular to a dissolubility total solid TDS probe.

Background

Total soluble Solids (Solids dispersed Total, TDS) was used to characterize how many milligrams of soluble Solids were Dissolved in 1 liter of water. Generally, the greater the TDS value, the poorer the water quality, as the more total dissolved solids are contained in the water.

The TDS detection method specified in 'sanitary Standard for Drinking Water' 2001 in China is a weighing method, wherein the TDS detection method comprises a water-bath steaming method and a drying method, and the principle is that a water sample is dried at a certain temperature, and the quality of obtained solid residues is the total solid content dissolved in water, including inorganic salts and organic matters which are not easy to volatilize. The measuring method has the disadvantages that the sample is difficult to be dried to constant weight, and the sample is easily polluted by external environment (dust, carbon dioxide and the like) in the weighing process, so that the ideal effect is difficult to achieve, and the measuring deviation is large.

Soluble total solids include both organic and inorganic species. Conductivity values are generally used to determine the salt content of a solution, and normally the higher the conductivity, the higher the salt content. Thus, the value of the total dissolved solids TDS in water can be indirectly characterized by conductivity.

The conductivity measurement method can be divided into three methods according to the measured conductivity principle, which are respectively as follows: electrode type measurement, ultrasonic measurement, and electromagnetic measurement. The ultrasonic conductivity measurement principle is to measure the conductivity according to the characteristic that ultrasonic waves change in a solution. This measurement is not easy to implement in actual measurement, so it is not much used. The electromagnetic conductivity measurement method is to measure the induced current according to the electromagnetic induction principle, thereby obtaining the conductivity of the aqueous solution and realizing the measurement of the conductivity; the method is limited in that the measuring range is narrow, and the method is mainly used for measuring the aqueous solution with higher conductivity value. The actual measurement of the conductivity is now largely based on electrode measurements. The electrode type conductivity measuring method is to obtain the conductivity by measuring the equivalent resistance of the water solution. The method has a simpler measuring structure compared with the first two methods, so the method has lower cost and wide application.

The TDS value, by definition of TDS of total dissolved solids, does not change with changes in temperature. However, the change in temperature causes ionization degree, solubility, ion migration speed, viscosity, swelling degree, etc. of the electrolyte in the solution, and thus has a direct influence on the conductivity. Therefore, the influence of temperature must be considered when determining the TDS value using the conductivity, i.e., temperature compensation is performed on the TDS value, so that an accurate TDS value can be measured.

The existing soluble total solid TDS probe has the hidden trouble of water seepage caused by untight sealing between a metal probe and a plastic shell. TDS probe infiltration can increase water purification unit's safety risk, and water can flow to indoor from water purification unit when serious, causes life and loss of property to furniture.

In addition, in practical application, the total dissolved solids TDS probe is disposed on the raw water side of the waterway. Probes are subject to impurities in the water, soluble solids depositing on the probe surface after a period of use, causing probe misalignment.

Disclosure of Invention

In view of this, the utility model provides a can satisfy simple accurate, real-time online, the strong operability's of TDS detection solubility total solid TDS probe, its characteristics: firstly, the TDS sensor and the temperature sensor are arranged in the same shell, so that simultaneous and same-position measurement of TDS and temperature of a measured liquid is realized, temperature deviation caused by different detection positions is reduced, and accurate compensation of temperature on a TDS value is realized; secondly, the TDS probe tail part of the utility model is plastically packaged by adopting a low-pressure injection molding process, so that the probe is integrally sealed, the water seepage hidden danger is eliminated, and meanwhile, the tail part electric wire can be centered and integrally beautiful; thirdly, the probe of the TDS sensor is exposed out of the shell of the sensor, and the root of the probe is provided with a cylindrical outer edge, so that the long-acting needle outlet length of the probe cannot be influenced by the deposition of impurities during long-time use, and further the testing precision cannot be influenced.

The utility model discloses a reach the technical scheme that above-mentioned purpose adopted and be:

a total dissolved solid TDS probe comprises a probe assembly, a wire assembly and a sheath, wherein the probe assembly comprises a probe, a probe bracket, a shell, a circular tube terminal, a thermistor, an insulating sleeve and encapsulated epoxy resin; drawing a wire assembly from within the probe assembly, the wire assembly including wires, terminals, and connectors; and packaging the tail part into a sheath by using a low-pressure injection molding process.

The probes are made of stainless steel or titanium alloy plates or bars which meet food-grade environmental protection requirements and are corrosion-resistant for a long time, and the probes are preferably arranged in pairs.

After the probe is processed and formed, the probe is used as an insert to form a probe support in an injection molding mode, and flanges are arranged on two sides of the probe support so that the probe support can be installed in the shell.

The electric wire is internally provided with four wire cores, and different wire cores are distinguished through different colors of the outer insulating layer.

One end of the round tube terminal is connected with a wire core in the wire in a crimping mode, the other end of the round tube terminal is sleeved with the insulating sleeve 9 and then inserted into a probe on the probe support, and the probe and the round tube terminal are reliably connected in a crimping mode, a welding mode and the like.

After the pins of the thermistor are sleeved with the insulating sleeve 9, the two pins are respectively and electrically connected with the wire core in the wire in a crimping or welding mode and the like.

The pipe diameter of the insulating sleeve 9 changes according to the different sizes of the pin of the thermistor and the wire core diameter, and the insulating sleeve is used for protecting the insulation between the pin of the thermistor and the insulation between the connecting points of the thermistor and the wire core.

The shell is cylindrical, and the shell bottom is provided with the through-hole that can pass TDS probe holder and the convex closure of installation thermistor.

The inner side wall of the shell is provided with a guide groove matched with the probe support and used for installing the probe support into the shell along the guide groove.

And the thermistor is arranged in the convex hull at the end part of the shell after the probe support is arranged in the shell.

And epoxy resin glue is filled in the shell filled with the probe support and the thermistor so as to realize waterproof sealing of the top end of the probe.

Belong to interference fit between TDS probe support and the shell through-hole, prevent that epoxy from oozing the shell when filling.

After the probe support and the thermistor are firmly electrically connected with the corresponding wire cores, the tail is packaged by using a low-pressure injection molding process, so that the tail is waterproof and the wire is centered.

Drawings

The present invention will be further described with reference to the accompanying drawings and examples.

Fig. 1 is a schematic diagram of a soluble total solid TDS probe according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a soluble total solid TDS probe according to an embodiment of the present invention.

Fig. 3 is a side view of a housing of a total dissolved solids TDS probe according to an embodiment of the present invention.

The numbering in FIG. 1 is as follows:

1. the probe comprises a probe, 2, a probe support, 3, a shell, 4, a circular tube terminal, 5, an electric wire, 6, a terminal, 7, a connector, 8, a sheath, 9, an insulating sleeve, 10, epoxy resin and 11, a thermistor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1-3, a soluble total solids TDS probe is embodied to include a probe assembly, a wire assembly and a sheath, the probe assembly including a probe 1, a probe holder 2, a housing 3, a round tube terminal 4, a thermistor 11, an insulating sleeve 9 and an encapsulating epoxy 10; drawing a wire assembly from within the probe assembly, the wire assembly comprising 5 wires, 6 terminals, and 7 connectors; and then packaging the tail part into 8 sheaths by using a low-pressure injection molding process.

The preferable TDS probes are made of stainless steel or titanium alloy plates or bars meeting food-grade environmental protection requirements and being capable of resisting corrosion for a long time, and are arranged in pairs.

The probe plate-like or rod-like material is preferably formed into a predetermined shape by a processing method such as punching or cutting.

After the preferred probe is processed and formed, the probe support is formed in an injection molding mode as an insert, and cylindrical plastic is arranged on the probe support to wrap the probe, so that the probe support is arranged in the shell.

The preferred electric wire contains four sinle silks, and different sinle silks are distinguished through the colour difference of outer insulating layer.

One end of the optimized round tube terminal is connected with a wire core in the wire in a crimping mode, the other end of the optimized round tube terminal is sleeved with the insulating sleeve 9 and then inserted into a probe on the probe support, and the probe is reliably connected with the round tube terminal 4 in crimping, welding and other modes.

The pin of the preferred thermistor is sleeved with an insulating sleeve 9, and the pin is respectively and electrically connected with the wire core of the wire 5 in a crimping or welding mode and the like.

The pipe diameter of the preferred insulation sleeve 9 changes according to the different sizes of the pin of the thermistor and the wire core diameter, wherein the insulation sleeve 9 is used for ensuring the insulation between the pin of the thermistor, and the other insulation sleeve is used for ensuring the insulation between the connecting points of the thermistor and the wire core diameter.

The insulating sleeve 9 may be made of polyimide, teflon, or cross-linked polyethylene.

Preferably the end of the housing is provided with a through hole to mate with two cylindrical posts of the probe holder.

The end of the preferred housing is provided with a convex hull for mounting the thermistor.

After the preferred probe support is firmly electrically connected with the corresponding wire core, the TDS probes arranged in pairs penetrate through the through holes arranged in the shell and then are exposed out of the shell.

The preferred TDS probe is in interference fit with the through hole of the housing.

After the optimized thermistor is firmly connected with the corresponding wire core, the thermistor is arranged in a convex closure arranged at the end part of the shell.

The preferred epoxy resin is filled in the shell of the probe support, and after curing, the epoxy resin realizes the functions of connecting, fixing and sealing the probe support and the shell and preventing water seepage.

The encapsulation of carrying out the afterbody in low pressure injection mold is put into to preferred shell after filling the epoxy solidification, reaches that the whole second floor of probe is sealed, realizes preventing that the probe from seeping water, the electric wire is placed in the middle, the pleasing to the eye effect of appearance.

Based on the dissolved total solid TDS probe and the manufacturing method thereof described in the above embodiments, the manufacturing process includes: firstly, processing a stainless steel or titanium alloy plate or bar into a probe with a specified size and shape.

And step two, the probe is used as an insert to be molded into a probe bracket.

And step three, forming the shell through an injection molding process.

And fourthly, connecting one end of the circular tube terminal with a wire core in the wire in a crimping mode, and connecting the other end of the circular tube terminal with a probe on the injection molding support after the insulating sleeve is installed at the crimping position.

And fifthly, after the insulation sleeve is arranged on the pin of the thermistor, the pin of the thermistor is respectively and electrically connected with the wire core of the wire.

And step six, the probe support which completes the steps is arranged in the shell, and a cylindrical sheath arranged on the probe support is matched with a through hole arranged at the end part of the shell.

And step seven, filling epoxy resin between the shell and the probe support, and forming connection between the probe support and the shell and fixing, sealing and waterproofing of the thermistor after the epoxy resin is cured.

And step eight, putting the probe which is subjected to the steps into a low-pressure injection molding mold, and packaging the tail part of the probe by using a low-pressure injection molding process, so that the probe is waterproof in sealing, the electric wire is centered, and the whole body is attractive.

Claims (5)

1. A soluble total solid TDS probe, characterized by: the probe assembly comprises a probe, a wire assembly and a sheath, wherein the probe assembly comprises a probe, a probe bracket, a shell, a circular tube terminal, a thermistor, an insulating sleeve and encapsulated epoxy resin; drawing a wire assembly from within the probe assembly, the wire assembly including wires, terminals, and connectors; and packaging the tail part into a sheath by using a low-pressure injection molding process.

2. The TDS probe of claim 1, wherein the TDS probe and the temperature sensor are disposed on a same housing, wherein the TDS probes are disposed in pairs and exposed at one end of the housing; the thermistor is arranged in the convex hull at the end part of the shell.

3. The TDS probe of claim 1, wherein the probe holder is configured with a protrusion, and the protrusion is exposed at one end of the housing after the probe holder is mounted.

4. The TDS probe of claim 1, wherein the end of the housing is configured with a through hole and a convex hull, wherein the through hole is in interference fit with the probe holder, and the convex hull is used for installing the thermistor.

5. The TDS probe of claim 1, wherein the probe holder and the thermistor are encapsulated in epoxy glue and encapsulated by low pressure injection molding after being placed in the housing.

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