Current type starter

Abstract

The utility model mainly relates to the technical field of compressor control, and provides a current type starter in order to solve the problem that the current type starter is easily damaged due to impulse voltage and impulse current when the current type starter is disconnected from a starting winding of a compressor in the starting process of the compressor. Comprising a heavy punch starter, a starting capacitor, an NTC element and an X2 safety capacitor, an operation winding of the compressor is connected with one end of a coil of the heavy punch starter, the other end of the coil of the heavy punch starter is connected with a zero line end, and a static contact of the heavy punch starter is connected with a starting winding of the compressor. A movable contact of the heavy punch starter is sequentially connected with the NTC element and the starting capacitor and then connected with an external zero line end, a common end of the compressor is connected with an external live wire end, the X2 safety capacitor is connected with the NTC element and the starting capacitor in parallel, and current impact on a contact of the current type starter and impact on a starting winding coil of the compressor in the starting process of the compressor can be reduced.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of compressor control, and particularly relates to a current type starter. Background Art

[0002] Under normal circumstances, the current type starter is mainly applied to light commercial refrigeration compressors. Due to the application environment of the current type starter, the compressor and the current type starter are required to have the following characteristics:

[0003] 1. Under medium and high back pressure conditions, the compressor and the matched current type starter can start and operate quickly;

[0004] 2. The compressor and the matched current type starter can meet the functional requirements of frequent starting of refrigeration appliances;

[0005] 3. The compressor and the matched current type starter are safe and reliable in use.

[0006] As Figure 1 shown, the current type starter assists in starting and operating a commercial refrigeration compressor motor. The current type starter is connected in series with the running winding coil of the compressor motor; when the compressor motor is connected to the power supply and starts, the starting current of the compressor motor is relatively large at the moment of starting. The starting current generates an electromagnetic force through the coil on the current type starter, and the weight in the starter moves under the action of the electromagnetic force, so that the static contact of the weight starter is connected to the starting winding of the compressor, and the starting winding of the compressor is connected to the circuit, and the compressor starts to operate. When the rotational speed of the compressor motor continuously increases and reaches 75 - 80% of the synchronous speed, the starting current of the compressor motor gradually decreases, and the electromagnetic force generated by the coil on the starter can no longer hold the weight, and the weight drops and separates from the starting winding, so that the starting winding is disconnected from the circuit, and the current type starter completes the starting task.

[0007] When the moving contact of the current type starter just disconnects from the starting winding, the clearance limit is very small, and almost all the voltage of the circuit is applied between the contacts, which will form a very strong electric field. A large number of charged particles are formed between the electrodes, making the gas conductive to form a hot electron flow (i.e., arc), which will instantaneously generate an impact voltage and an impact current, easily causing an impact on the contacts and resulting in damage to the current type starter. At the same time, if the impact voltage is too high, the rated voltage of the starting capacitor will exceed the specified requirements and cannot meet the safety certification requirements. Content of the Utility Model

[0008] Technical Problem to be Solved by the Utility Model

[0009] The utility model provides a current type starter, aiming to solve the problem that the impact voltage and impact current when the current type starter disconnects from the starting winding of the compressor during the starting process of the compressor are likely to cause damage to the current type starter.

[0010] The technical solution adopted by the present utility model to solve the above technical problems

[0011] A current starter, including a weight starter, a starting capacitor, an NTC component and an X2 safety capacitor. The running winding of the compressor is connected to one end of the coil of the weight starter, the other end of the coil of the weight starter is connected to the zero line terminal, the static contact of the weight starter is connected to the starting winding of the compressor, and the moving contact of the weight starter is connected to the NTC component and the starting capacitor in sequence and then connected to the external zero line terminal. The common terminal of the compressor is connected to the external live line terminal. One end of the X2 safety capacitor is connected between the moving contact of the weight starter and the NTC component, and the other end of the X2 safety capacitor is connected to the zero line.

[0012] Furthermore, the current starter further includes a running capacitor, and the running capacitor is connected in series with the starting winding of the compressor.

[0013] Furthermore, the current starter further includes an overload protector, and the overload protector is connected in series with the common terminal of the compressor.

[0014] The beneficial effects of the present utility model

[0015] For the current starter described in the present utility model, on the basis of setting the NTC component and the starting capacitor in series, an X2 safety capacitor is connected in parallel, which can effectively reduce the current impact on the contacts of the current starter when the current starter is disconnected from the starting winding of the compressor, improve the safety and reliability of the components of the current starter during the starting process of the compressor, and at the same time can reduce or limit the impact of the starting current of the compressor motor on the motor winding coil within a short time, reduce the current density of the winding coil, and improve the reliability of the motor operation. Description of the drawings

[0016] Figure 1 It is a schematic structural diagram of the existing current starter described in the background technology;

[0017] Figure 2 It is a schematic structural diagram of a current starter described in the present utility model;

[0018] Reference numerals: 1 - weight starter, 2 - compressor winding, 3 - NTC component, 4 - starting capacitor, 5 - running capacitor, 6 - overload protector, 7 - X2 safety capacitor. Detailed implementation manners

[0019] The structure of a current starter described in the present utility model is as Figure 2 shown, including a weight starter 1, a starting capacitor 4, an NTC component 3, a running capacitor 5, an overload protector 6 and an X2 safety capacitor 7; Figure 2In the middle compressor winding 2, the left side is the compressor starting winding and the right side is the compressor running winding. One end of the coil of the weight starter 1 is connected to the running winding through the jack M, and the other end of the coil of the weight starter 1 is connected to the neutral line. The static contact of the weight starter 1 is connected to the starting winding of the compressor through the jack S. The moving contact of the weight starter 1 is connected to the NTC component 3. The NCT component 3 is connected to the starting capacitor 4 through the 187 terminal and then connected to the external neutral line terminal through the 250 terminal. The external live wire terminal is connected to the common terminal of the compressor through the jack C. The NTC component 3 and the starting capacitor 4 are connected in series and then connected in parallel with the X2 safety capacitor 7. One end of the X2 safety capacitor 7 is connected to the front end of the NTC component 3 through the 187 terminal and the other end is connected to the neutral line.

[0020] In order to improve the stability of the circuit operation, the current starter described in the present utility model further includes a running capacitor 5, and the running capacitor 5 is connected in series with the compressor starting winding through the 250 terminal; at the same time, an overload protector 6 is also provided at the common terminal of the compressor.

[0021] When the current starter is powered on, the static contact of the weight starter 1 rises and is connected to the compressor starting winding, and the current starter is turned on. At this time, the starting capacitor 4 and the NTC component 3 are connected in series and then connected in parallel with the X2 safety capacitor 7 and connected to the compressor motor starting winding, and the compressor starts and runs. After the compressor starts and runs for a period of time, the running current decreases, and the electromagnetic force is not enough to hold the weight starter 1. The static contact of the weight starter 1 is disconnected from the compressor starting winding. The NTC component 3 and the X2 safety capacitor 7 suppress the surge impact, can reduce the current impact on the contacts of the current starter, and at the same time reduce the impact of the compressor motor starting current on the motor starting winding coil and the current density; after the current starter is disconnected from the compressor starting winding, the starting of the compressor is completed and it enters the normal operation state.

Claims

1. A current starter, comprising a weight starter, a starting capacitor, and an NTC component. The running winding of the compressor is connected to one end of the coil of the weight starter, the other end of the coil of the weight starter is connected to the zero line terminal, the static contact of the weight starter is connected to the starting winding of the compressor, the moving contact of the weight starter is connected to the NTC component and the starting capacitor in sequence and then connected to the external zero line terminal, and the common terminal of the compressor is connected to the external live line terminal. It is characterized in that, It also includes an X2 safety capacitor, one end of the X2 safety capacitor is connected between the moving contact of the weight starter and the NTC component, and the other end of the X2 safety capacitor is connected to the neutral line terminal.

2. The current starter according to claim 1, characterized in that, It also includes a running capacitor, and the running capacitor is connected in series with the starting winding of the compressor.

3. The current starter according to claim 1 or 2, characterized in that, It also includes an overload protector, and the overload protector is connected in series with the common terminal of the compressor.

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