CN2900591Y

CN2900591Y - Washing machine using water draining electromagnet and its water draining electromagnet module

Info

Publication number: CN2900591Y
Application number: CN 200320118125
Authority: CN
Inventors: 区长钊
Original assignee: Jinling Electrical Co Ltd
Current assignee: Jinling Electrical Co Ltd
Priority date: 2003-11-17
Filing date: 2003-11-17
Publication date: 2007-05-16
Anticipated expiration: 2013-11-17

Abstract

A washing machine using dewatering electromagnet comprises a dewatering electromagnet assembly, wherein the washing machine is provided with an electric power device, a dewatering and eliminating device and a traction electromagnet, the electromagnet is connected with the electric power around the winding drive circuit to form a closed loop circuit, a PTC electric resistance is cascaded in the closed loop circuit, the closed loop circuit comprises a control switch, a PTC electric resistance and a current regulator, the AC input end of the current regulator is connected to the electric power device through the control switch and the PTC electric resistance, an absorbent circuit and a winding of D.C. electromagnet which keeps the circuit as the same winding are connected with the D.C. output end of the current regulator, the dewatering electromagnet assembly comprises a mounting unit and a PTC electric resistance, a current regulator, a D.C. electromagnet and an input connecting end which are fixed on the mounting unit, the PYC electric resistance is connected with a capacitor in parallel. The utility model overcomes the defects of the winding structure and the position switch of traditional D.C. dewatering electromagnet, absolves the disturbance of thyristor pressure regulating circuit, and makes the circuit performance better and cost less.

Description

Use the washing machine and the electromagnet to discharge water assembly thereof of electromagnet to discharge water

Technical field

The utility model relates to a kind of washing machine and electromagnet to discharge water assembly thereof that uses electromagnet to discharge water, and in International Patent Classification (IPC), classification belongs to D06F39/08 or F16K31/06.

Background technology

Use the washing machine of electromagnet to discharge water to have: draining valve, the electromagnet to discharge water (the following electromagnet that is called for short) of traction draining valve is to the control circuit of electromagnet output voltage; When opening draining valve, control circuit makes it to start adhesive to electromagnet output pick-up voltage; During draining valve is opened, keep voltage to electromagnet output, make it to keep attracting state.

The simplex winding alternating electromagnet that early stage washing machine uses AC power directly to power owing to have more serious electromagnetic noise and safety problem, changed the use electromagnetic for direct drainage into afterwards mostly.Its recent developments are found in the light industry standard QB/T2482-2000 of the People's Republic of China (PRC) " electromagnetic for direct drainage " of issue on June 13rd, 2000, " automatic washing machine principle and maintenance " (Fujian science tech publishing house 2000 January the 1st edition the 27th page): for washing machine as shown in Figure 1, it has the circuit of electromagnet to discharge water as shown in Figure 2 and control thereof; The coil of described electromagnet 14 comprises two windings---the adhesive winding L 1 in few number of turn thick line footpath and the maintenance winding L 2 that multiturn is counted fine line diameter; Establish the moving disconnected moving position switch S that declines that promotes by the armature adhesive in the electromagnet 14; Switch S is in parallel with maintenance winding L 2, is in closure state when the armature of electromagnet 14 discharges; Power electronics drive circuit 13 comprises bidirectional thyristor V1 and the rectifier bridge element V2 that uses as on-off switch.When electromagnet 14 adhesives start, switch S still is in closure state, under the control of single chip machine controlling circuit 2, alternating voltage from supply unit 11 is a DC voltage through bidirectional thyristor conducting and rectifier bridge element V2 rectification, all is applied to the enough big first absorbing current of formation on the adhesive winding L 1; Finish when changing hold mode in adhesive action, switch S is pushed to off-state by electromagnet armature, keep winding L 2 access circuits, the identical DC voltage of power electronics drive circuit 13 outputs is applied to adhesive winding L 1 and keeps making electric current be reduced to the maintenance electric current on the series circuit of winding L 2.According to the listed nominal parameter of QB/T2482, the specified maintenance electric current I of the electromagnet under the rated voltage _B0Much smaller than specified absorbing current I just _C0, be about the latter's 1/tens.There are the following problems for described washing machine:

1, described switch is pushed into when disconnecting, the maintenance winding that the continuous current circuit of the big inductance DC current of adhesive winding is subjected to being connected intercepts, so that when release reaches the electromagnetic energy of joule level, produce quite high overvoltage, obvious damage switch contact and winding insulation need the performance of switch and winding is proposed higher requirement.Be limited to volume and cost, make this switch reach enough reliability and life-span suitable difficulty often; Bad as closure, when electromagnet starts in adhesive, keep winding to be connect people's circuit, thereby by the less current the same with keeping electric current down to can not adhesive; As disconnect bad; electromagnet is finished when changing hold mode in adhesive action; the voltage of power electronics drive circuit output still all is applied on the adhesive winding; thereby long-time passing through and the first the same bigger electric current of absorbing current; cause circuit overheated; as be not provided with holding circuit or it is malfunctioning, will burn the adhesive winding, even electrical fire will take place.Big or supply voltage is on the low side to wait accident outside the electromagnet so that normally adhesive and when switch is disconnected of electromagnet because tractive load becomes, even the situation of above-mentioned for a long time bigger electric current takes place in accident expansion.

2, electromagnet uses two sections winding constructions, and it keeps winding is the fine line diameter winding, and the material unit price is higher, and needs higher coiling and insulating treatment process requirement.When electromagnet was in hold mode, two sections quite big windings in series of line footpath gap flow through identical maintenance electric current, and to the adhesive winding, its current density is too low, and material is obviously wasted; To keeping winding, its current density is often higher, so that temperature rise is higher, influences safety and life-span.

For overcoming the problems referred to above, the applicant's the CN1393592 of Chinese patent application formerly " using the washing machine of electromagnetic for direct drainage " proposes to use the DC electromagnet of simplex winding, control is to the angle of flow of the bidirectional thyristor circuit of its power supply, make it output at first for the specified voltage of just inhaling, be reduced to specified maintenance voltage then.This method can overcome the disadvantage of the winding construction and the position switch of traditional electromagnetic for direct drainage, thereby improve reliability and reduce cost, but bidirectional thyristor phase-shift voltage regulating circuit can produce some electromagnetic interference to power supply, authenticate the EMC standard that relates to for implementing the 3C that comes into effect in August, 2003, need to replenish suitable filter circuit.In addition, this design also is not suitable for using motor-type cyclelog etc. that the washing machine of contact circuit control is arranged.

Summary of the invention

Technical problem to be solved in the utility model is: a kind of washing machine and electromagnet to discharge water assembly thereof that uses electromagnet to discharge water is provided, in the disadvantage of winding construction that overcomes traditional electromagnetic for direct drainage and position switch, can exempt the interference problem that the thyristor voltage regulation circuit produces, its circuit structure function and cost are better.

The technical solution of the utility model is a kind of washing machine that uses electromagnet to discharge water, has supply unit, and row/dewatering device reaches the electromagnet to its traction; The winding of electromagnet is access to supply unit through drive circuit, constitutes the closed-loop path; It is characterized in that: be in series with the PTC resistive element in the described closed-loop path.

The modular design of this technical scheme is: described closed-loop path comprises gauge tap, PTC resistance unit and rectifier; The ac input end of rectifier is access to supply unit through gauge tap and PTC resistive element; One attraction circuit and holding circuit are the DC electromagnet of same winding, and its winding is connected in the dc output end of described rectifier.

With the design concept that belongs to together of this modular design be, design the electromagnet to discharge water assembly that a kind of this washing machine of being more convenient for uses, comprise its a pair of input terminal, installed part and be fixed in PTC resistive element, rectifier, DC electromagnet and the described input terminal of this installed part; The ac input end of rectifier is access to described input terminal after the windings in series of PTC resistive element and DC electromagnet.

Further design is that described PTC resistive element is parallel with capacitor, and the cold-state resistance of design PTC resistive element is (5～10) % of D.C. resistance of the winding of DC electromagnet, the impedance of capacitor be DC electromagnet winding D.C. resistance (5～15) doubly.

The technical solution of the utility model is utilized the positive temperature coefficient resistor characteristic of the PTC resistive element that seals in the electromagnet current supply circuit dexterously, when starting, electromagnet has lower cold-state resistance, most supply voltage is landed in electromagnet, form enough first absorbing currents; Higher hot resistance is changed in the rising of along with self temperature then, and most supply voltage is landed in self, provides less maintenance electric current to electromagnet.A PTC resistive element so just can be equivalent to the applicant's the thyristor voltage regulation circuit that formerly Chinese patent application proposed, replace maintenance winding L 2 and moving disconnected declining in the prior art electromagnet to move the effect of position switch S, to use the electromagnet of simplex winding, simplified structure reduces cost and improves reliability.Because the PTC resistive element is changed into the process of higher hot resistance by lower cold-state resistance, the variation of circuit parameter is the dull continuous function of time, so do not have the step process in the circuit working of the technical solution of the utility model, and the alternating current in each cycle is complete sine wave, this just can not produce relevant overvoltage and electromagnetic interference, thereby improves reliability and Electro Magnetic Compatibility.Compare with the filter circuit that IGCT phase-shift voltage regulating circuit need replenish, the PTC resistive element that this scheme relates to and the cost of capacitor can be lower.The winding of DC electromagnet is access to power supply after a bigger and reliable impedance series connection, high-power short circuit problem can not take place, safeguard measures such as built-in thermal cut-off that can prior art, thereby simplified structure and reducing cost.This scheme also can not used IGCT, thereby both is fit to the computer washing machine, and also suitable use motor-type cyclelog etc. has the washing machine of contact circuit control.

To the PTC resistive element of shnt capacitor, can select its higher hot resistance parameter.At this moment, mainly provide the maintenance electric current, can lower the energy consumption of circuit by capacitor.

The integrated of production is convenient in the design of electromagnet to discharge water assembly, and helps exchanging with driving element such as tractizer, especially is fit to the non-computer washing machine and uses.

Description of drawings

The following drawings is used to illustrate embodiment of the present utility model:

Fig. 1 is prior art and each embodiment washing machine structure sketch map of the utility model.

Fig. 2 is the electromagnet and the control circuit figure thereof of prior art washing machine.

Fig. 3 is the electromagnet and the control circuit figure thereof of the utility model the 1st embodiment washing machine.

Fig. 4 is the electromagnet and the control circuit figure thereof of the utility model the 2nd embodiment washing machine.

The specific embodiment

The mechanical basic structure of a kind of washing machine of prior art as shown in Figure 1, steel ladle 1 rotation are provided with the washtub that is provided with impeller 2 freely in the inner bottom part rotation dehydration barrel 3 of holding concurrently freely, hang in body of the washing machine 5 by suspender 4; Motor and transmission mechanism 7 thereof are located at the bottom of steel ladle 1, transmission of power to impeller 2 and the washtub dehydration barrel 3 of holding concurrently; Water system 8 supplies water in washtub is held concurrently dehydration barrel 3, and draining valve 9 is subjected to electromagnet 14 tractions, the discharges such as washings in the washing and dewatering bucket 3.This is a kind of typical case's formation of impeller-type automatic washing machine.But do not limit is pulsator washing machine, also can be agitator type washing machine or tumbling-box washing machine.In addition, but also interlock traction speed-reducing clutch of electromagnet 14 make washing machine carry out draining and dehydration simultaneously, or draw speed-reducing clutch separately, make the washing machine transmission system enter the dehydration running, start electronic draining pump draining simultaneously.

The washing machine of the utility model the 1st embodiment and the 2nd embodiment, be on the basis of the mechanical basic structure of washing machine as shown in Figure 1, electromagnet 14 is changed into the electromagnet 114 of the utility model the 1st embodiment or the electromagnet to discharge water assembly 214 of the 2nd embodiment, and Fig. 2 control circuit is done as Fig. 3 or improvement shown in Figure 4.

The electromagnet of the utility model the 1st embodiment washing machine and control circuit thereof are as shown in Figure 3, the coil of electromagnet 114 has only a winding L, be to remove with the product (hereinafter to be referred as original product) that prior art accord with Q B/T2482 requires to keep winding and position switch to constitute, L i.e. the adhesive winding L 1 of original product as shown in Figure 2; Use the power electronics drive circuit of changing a social system on the washing machine computer control panel of DC electromagnet 113 in prior art, it comprises original only as the bidirectional thyristor V1 of on-off switch use and the single chip machine controlling circuit 12 and the rectifier bridge element V2 of trigger electrode connection thereof, and the winding L of electromagnet 114 is connected in the dc output end of rectifier bridge element V2; But the ac input end at rectifier bridge element V2 is access in the closed-loop path of the power supply terminal 11 on the computer control panel through the major loop of bidirectional thyristor V1, in the junction of the main electrode of the ac input end of rectifier bridge element V2 and bidirectional thyristor V1, insert the combination in parallel of a PTC resistive element R and capacitor C.Certainly, this parallel connection combination also can be inserted between original other connection in described closed-loop path.In addition, also shnt capacitor C not on the PTC resistive element R, the PTC resistive element of shnt capacitor C can also not insert the dc output end of rectifier bridge element V2.

220 volts of present embodiment washing machine power supply rated voltages, about 90 ohm of the resistance of the winding L of electromagnet 114, the cold-state resistance of the PTC resistive element R that selects for use is 8 ohm, hot resistance is 20000 ohm (during shnt capacitors) or 1000 ohm when shnt capacitor (not), 0.2～1 second start-up time, about 10 seconds of hot resetting time; Capacitor C can adopt common ac motor metallic film capacitor, and price is cheaper and reliable, and capacitance is 3 microfarads, 250 volts of rated voltages.

The PTC resistive element of above parameter can be selected for use from existing product (as field-discharge resistance, fuse etc. certainly resets) catalogue or be customized.Longer as hot resetting time, be preferably in the program of control row/dehydration of prior art single chip machine controlling circuit 12, electromagnet is replenished the delayed startup step of uncapping and resetting.This step is with respect to prior art, also can avoid frequently uncapping impact damage and noise to washing machine transmission mechanism and circuit.

The electromagnet of the utility model the 2nd embodiment washing machine and control circuit thereof as shown in Figure 4, the difference of itself and the 1st embodiment is:

---designed the electromagnet to discharge water assembly 214 that a kind of washing machine of being more convenient for uses, PTC resistive element R, capacitor C, rectifier bridge element V2 and the part of DC electromagnet except that armature have been encapsulated in the plastic insulation box of a band installation foot; The plastic insulation box is provided with 2 binding posts, and ac input end of rectifier bridge element V2 connects wherein 1 binding post, and another ac input end is through the parallel connection of PTC resistive element R and capacitor C 1 binding post in addition that is connected;

---the washing machine that electromagnet to discharge water assembly 214 is installed is to use the cyclelog 213 that meets the machinery industry standard JB/T8968-1999 of the People's Republic of China (PRC) " the motor-type cyclelog of family expenses and similar applications ".The binding post of electromagnet to discharge water assembly 214 is access to supply unit 11 through the control of the draining in the cyclelog 213 contact K.

Above embodiment and the applicant formerly Chinese patent application proposed replaces the maintenance winding L 2 in traditional DC electromagnet the same with the effect of the moving disconnected moving position switch S that declines with the thyristor voltage regulation circuit, employed is the basic DC electromagnet of transforming the simplex winding that forms with the original product, the feasibility that also exists magnetic circuit, winding volume and line footpath to reduce, by the electromagnetism optimal design, can reach reduced volume and further reduce cost.

Claims

1, a kind of washing machine that uses electromagnet to discharge water has supply unit (11), and row/dewatering device (9) reaches the electromagnet (114,214) to its traction; The winding of electromagnet (L) is access to supply unit (11) through drive circuit (113,213), constitutes the closed-loop path; It is characterized in that: be in series with PTC resistive element (R) in the described closed-loop path.

2, washing machine according to claim 1 is characterized in that:

---described closed-loop path comprise gauge tap (V1, K), PTC resistive element (R) and rectifier (V2); (V1 K) is access to supply unit (11) with PTC resistive element (R) to the ac input end of rectifier (V2) through gauge tap;

---an attraction circuit and holding circuit are the DC electromagnet of same winding, and its winding (L) is connected in the dc output end of described rectifier (V2).

3, the electromagnet to discharge water assembly (214) that uses on a kind of washing machine as claimed in claim 2, comprise its a pair of input terminal, installed part and be fixed in PTC resistive element (R), rectifier (V2), DC electromagnet and the described input terminal of this installed part; The ac input end of rectifier (V2) is access to described input terminal after winding (L) series connection of PTC resistive element (R) and DC electromagnet.

4, the described electromagnet to discharge water assembly of washing machine according to claim 2 or claim 3 (214) is characterized in that: described PTC resistive element (R) also is parallel with capacitor (C).

5, the described electromagnet to discharge water assembly of washing machine according to claim 2 or claim 3 (214), it is characterized in that: described PTC resistive element (R) also is parallel with capacitor (C), and the cold-state resistance of PTC resistive element (R) is (5～10) % of D.C. resistance of the winding (L) of DC electromagnet, the impedance of capacitor (C) be DC electromagnet winding (L) D.C. resistance (5～15) doubly.