CN2241335Y

CN2241335Y - Water sample thermostat

Info

Publication number: CN2241335Y
Application number: CN 95219532
Authority: CN
Inventors: 江浩
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-08-31
Filing date: 1995-08-31
Publication date: 1996-11-27
Anticipated expiration: 2005-08-31

Abstract

The utility model relates to a water sample thermostat which is suitable for analyzing and processing the water sample in a power plant. The water sample thermostat is characterized in that the roginal edge of a transformer B1 is connected in series with a thyristor. Both ends of the thyristor are bridged with a triggering circuit which is composed of a capacitor C1 and a potentiometer W1 which are connected in series. The contact point of a temperature relay JT, the contact point of a temperature limiting relay JC, and the contact point of a cooling water relay JS are mutually connected in series to be bridged between the triggering circuit and the control pole of the thyristor. The auxiliary edge of the transformer B1 is connected with both ends of the power supply of a thermopile P through a rectify and voltage stabilizing circuit. The cooling surface of the thermopile P contacts the wall of the box of a heat exchanger. The utility model has thermostat temperature of water sample and simple control circuits.

Description

The sample water thermostat

The utility model relates to a kind of thermostat of test specimens water.

In the prior art, occasions such as generating plant need be carried out online sample analysis to its carbonated drink, and this just need provide continuous constant temperature water sample.Be extensive use of freon refrigeration equipment at present sample water is cooled off, its equipment volume is big, the control of the temperature of sample water is inaccurate.

The purpose of this utility model is to provide a kind of available semiconductor cooler that sample water is carried out the sample water thermostat that constant temperature is handled.

The technical solution of the utility model is: transformer B1 is in series with controllable silicon SCR on the former limit; between the negative electrode of controllable silicon SCR and the anode there be by capacitor C 1 cross-over connection; the capacitance-resistance phase shift trigger circuit that potentiometer W1 is composed in series; thermorelay normally closed contact JT; thermoelectric pile overheat protective relay normally closed contact JC; after connecting mutually, thermoelectric pile chilled water water cut-off protection relay normally closed contact JS is connected across between the slider and the controllable silicon SCR control utmost point of potentiometer W1; the secondary of transformer B1 is connected on the both ends of power of thermoelectric pile P after by rectification and mu balanced circuit, and the huyashi-chuuka (cold chinese-style noodles) of thermoelectric pile P contacts with the tank wall of heat exchanger.

The utility model compared with prior art has following advantage:

(1). thermoelectric pile (being semiconductor cooler) is when cooling off heat exchanger, need cool off with chilled water its thermal effect face, burn out to prevent that thermoelectric pile is overheated, so when chilled water cutout or thermoelectric pile are overheated, the normally closed contact of JS and JC relay is opened, make the control utmost point of controllable silicon SCR lose trigger pip, not conducting of controllable silicon SCR, thermoelectric pile can quit work.

(2). when the temperature of sample water arrived the control temperature of setting, the JT normally closed contact was opened, and controllable silicon SCR loses trigger pip and not conducting equally, thermoelectric pile dead electricity and stop to cool off sample water.

(3). the control electrode current of controllable silicon SCR is little, and employed relay rated current is little, and control circuit is simple.

The utility model will be further described below in conjunction with drawings and Examples:

Accompanying drawing 1 is circuit theory diagrams of the present utility model;

Accompanying drawing 2 is the circuit theory diagrams of the control circuit relevant with JT, JC, JS;

Accompanying drawing 3 is the structure cut-open view of heat exchanger of the present utility model;

Accompanying drawing 4 is the pipeline of the chilled water of monitoring semiconductor cooler use.

Embodiment: referring to accompanying drawing 1, form controllable silicon phase shift trigger circuit by capacitor C 1, potentiometer W1, resistance R 2, can behind left end input AC sine wave signal, produce trigger pip and make silicon symmetrical switch SCR conducting, to the former limit of transformer B1 output AC signal.Resistance R 3, capacitor C 2 formed surge voltage absorbing circuits, in controllable silicon SCR conducting or when closing, absorbs the back-emf of transformer B1.On the secondary of transformer B1, diode D1, D2, D3, D4 form bridge rectifier circuit, by providing DC voltage to thermoelectric pile P after capacitor C 3 filtering, for it heat exchanger are freezed.When the temperature of controlled sample water arrived setting value, relay J T normally closed contact disconnected, and is same, when if cutout of the chilled water of thermoelectric pile or thermoelectric pile are overheated, corresponding relays normally closed contact JC and JS also open, and controllable silicon SCR is quit work, and thermoelectric pile also quits work after losing power supply.The relay coil control circuit of JT, JS, JC relay normally closed contact can be designed to multiple, and accompanying drawing 2 promptly is one of embodiment wherein.In the accompanying drawing 2, the voltage after the transformer B2 step-down carries out voltage stabilizing by IC1 (model 7512) integrated package of pressure-stabilizing behind rectification, filtering circuit, and the relay road provides direct supply backward.RT2 is a thermistor, be arranged at the thermal effect face place of thermoelectric pile, thermoelectric pile is warm more, and its resistance is more little, correspondingly IC2 (dual time base circuit of model NE556) 6 pin current potential step-downs, when its current potential during less than 1/3VCC, 5 pin output high level, overtemperature relay coil JC must conduct, and its corresponding contact JC is opened, thermoelectric pile P is quit work, treat to rework again after its cooling.When the chilled water of thermoelectric pile stopped, RS resistance was equivalent to disconnect, and the 8 pin current potentials of IC2 descend, when dropping to less than 2/3VCC, and 9 pin of IC2 output high level, it is electric that relay coil JS is got, and its corresponding contact JS opens, and thermoelectric pile P quits work.When any of relay coil JS, JC get electric after, corresponding normally opened contact JC, JS closure in the accompanying drawing 2, making by IC3 (model is identical with IC2) is to lead the audio signal generator work of forming, and sends chimes of doom by loudspeaker Y.The sample water controller is detected sample water by the XMTD2002 temperature controller, and its thermistor Rt1 is arranged in the sample water, and when the sample coolant-temperature gage was lower than setting value, the JT normally closed contact was opened, and control thermoelectric pile P quits work.Heat exchanger is a water tank type in the accompanying drawing 3, form by sample water rising pipe [1], casing [2], sample water water inlet pipe [3], described sample water water inlet pipe [3] is positioned at casing [2] inner chamber bottom than short and its mouth of pipe, described sample water rising pipe [1] is positioned at casing [2] inner chamber top than long and its mouth of pipe, the chill surface of thermoelectric pile P directly contacts with the tank wall of casing [2], and the sample water in the inner chamber is cooled off.Because above-mentioned structure can make sample water carry out sufficient heat interchange in casing [2], make sample water that sufficient heat exchanger time be arranged in cooling procedure on the one hand, make cooling effect very good.The volumetric flow rate of water tank capacity and sample water per minute has bigger volumetric ratio on the other hand, thereby the drift of sample water leaving water temperature is reduced greatly, has improved the precision of constant temperature.Referring to accompanying drawing 4, sample water is flowed into by inlet [4], is flowed out by outlet [6].The probe that insulate with metallic matrix is located to be provided with in sensor holder [5] and [7], probe lead is connected to the RS two ends of accompanying drawing 2 respectively, during the chilled water proper flow, because the electric conductivity of water, make the resistance (being RS) that forms a low resistance between two probes, this resistance makes the 8 pin current potentials of IC2 be higher than 2/3VCC, and 9 pin of IC2 are drawn low level, not adhesive of relay J S.When chilled water stopped, the two ends that are equivalent to RS in the accompanying drawing 2 disconnected, and then JS gets electric adhesive.

Claims

1. sample water thermostat; it is characterized in that: transformer B1 is in series with controllable silicon SCR on the former limit; between the negative electrode of controllable silicon SCR and the anode there be by capacitor C 1 cross-over connection; the capacitance-resistance phase shift trigger circuit that potentiometer W1 is composed in series; thermorelay normally closed contact JT; thermoelectric pile overheat protective relay normally closed contact JC; after connecting mutually, thermoelectric pile chilled water water cut-off protection relay normally closed contact JS is connected across between the slider and the controllable silicon SCR control utmost point of potentiometer W1; the secondary of transformer B1 is connected on the both ends of power of thermoelectric pile P after by rectification and mu balanced circuit, and the huyashi-chuuka (cold chinese-style noodles) of thermoelectric pile P contacts with the tank wall of heat exchanger.

2. sample water thermostat according to claim 1, it is characterized in that: described heat exchanger is a water tank type, form by sample water rising pipe [1], casing [2], sample water water inlet pipe [3], described sample water water inlet pipe [3] is positioned at casing [2] inner chamber bottom than short and its mouth of pipe, and described sample water rising pipe [1] is positioned at casing [2] inner chamber top than long and its mouth of pipe.