JPH01114676A - Method of driving direct acting type electromagnetic changeover valve - Google Patents

Abstract

PURPOSE: To operate a switching valve surely by setting the total conduction time at the time of switching the position from cooling operation to heating operation longer than that at the time of switching the position from heating operation to cooling operation. CONSTITUTION: A long pulse of 1 sec is applied at the time of switching the position from cooling operation to heating operation and a short pulse of 100 mscc is applied at the time of switching the position from heating operation to cooling operation. Since the total conduction time of a four-way valve at the time of switching the position from cooling operation to heating operation is set longer than that at the time of switching the position from heating operation to cooling operation, the valve can be driven with a strong force and since the four-way valve is conducted for a long time, it can be operated surely even if it does not operate well at first.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method for driving a direct-acting electromagnetic switching valve used in an air conditioner that can switch between cooling operation and heating operation. It is.

(Prior Art) Heat pump air conditioners are generally known as air conditioners that can switch between cooling operation and heating operation. This heat pump air conditioner is composed of a refrigeration circuit as shown in FIG. This circuit consists of indoor heat exchanger 11
The expansion valve 12, the outdoor heat exchanger 13, and the four-way valve 14 constitute a closed circuit in this order, and the other two boats of the four-way valve 14 are connected to the discharge side and suction side of the compressor 15, respectively. There is. Note that the reference numeral 16 in the figure is an electromagnetic two-way valve.

In such a configuration, during cooling operation, the valve body of the four-way valve 14 is positioned as shown in FIG. 5. Then, the refrigerant is transferred to the compressor 15, the four-way valve 14, the outdoor heat exchanger 13, the expansion valve 12, the indoor heat exchanger 11, and the four-way valve 14.
, compressor 15 in this order for cooling. In addition, when performing heating operation, the positions of the four-way valves are changed and the refrigerant is transferred to the compressor 15, the four-way valve 14, the indoor heat exchanger 11, and the expansion valve 12.
, outdoor heat exchanger 13, four-way valve 14, and compressor 15 in this order to perform heating. FIGS. 6 and 7 show a three-way valve whose main parts are the same as the four-way valve 14 shown in FIG. 5. This three-way valve has a main body 21, a compressor discharge pipe attached vibe 22, a compressor suction pipe attached vibe 23, an outdoor heat exchanger side attached vibe 24, and an indoor heat exchanger side attached pipe 2.
5 is provided, and the plunger 27 is driven by applying DC pulse power to the electromagnetic coil 26, and a slider 28 provided at the tip of the plunger 27 is moved to switch the circuit. FIG. 6 shows the case of cooling operation, in which the refrigerant from the compressor flows into the main body 21 from the compressor discharge pipe attachment vibe 22, is discharged from the outdoor heat exchanger side attachment pipe 24, and goes to the outdoor heat exchanger. Sent. Further, the refrigerant from the indoor heat exchanger flows from the indoor heat exchanger-side attached vibe 25 through the slider 28 into the compressor suction pipe attached vibe 23, and is sent to the compressor. On the other hand, FIG. 7 shows the case of heating operation, and the refrigerant from the compressor flows into the main body 21 through the compressor discharge pipe attachment vibe 22, is discharged through the indoor heat exchanger side attachment pipe 25, and is discharged from the indoor heat exchanger. sent to. Further, the refrigerant from the outdoor heat exchanger flows from the outdoor heat exchanger side attachment pipe 24 through the slider 28 into the compressor suction pipe attachment vibe 23, and is sent to the compressor.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional method, there is a problem that malfunctions tend to occur when switching the switching valve from the cooling operation position to the heating operation position in winter. was there. That is, the refrigeration circuit contains refrigeration oil, and this refrigeration oil naturally enters the valve together with the refrigerant. However, the viscosity of this refrigerating machine oil decreases at low temperatures.

As a result, the movement of the valve deteriorates, making it impossible to reliably switch the valve.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a method for driving a direct-acting electromagnetic switching valve that can reliably switch the valve.

[Structure of the invention]

(Means for Solving the Problems) The present invention has been made to solve the above problems, and is a direct-acting electromagnetic switching valve for switching between heating operation and cooling operation in a refrigeration circuit of an air conditioner. In the drive method, when switching from the cooling operation position to the heating operation position, the total energization time applied to the direct-acting electromagnetic switching valve is changed from the heating operation position to the cooling operation position. It is characterized by being longer than the total energization time applied to the valve.

(Function) In the present invention, the total energization time when switching from the cooling operation position to the heating operation position is made longer than the total energization time when switching from the heating operation position to the cooling operation position. The valve can be driven with a strong force, and even if the valve is difficult to operate at the time of energization, it can be operated reliably afterwards because the valve is energized for a long time. Therefore, when switching the switching valve from the cooling operation position to the heating operation position in winter, even if the viscosity of the refrigeration oil in the refrigeration circuit decreases,
The valve can be operated reliably to perform switching.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 4. These figures show pulses applied to the four-way valve 14 provided in the refrigeration circuit of the air conditioner as shown in FIG.

FIG. 1 shows the pulses applied when switching from the cooling operation position to the heating operation position. In this case, 5 to 10 continuous pulses are applied.

FIG. 2 shows pulses when switching from the heating operation position to the cooling operation position, and in this case, only one pulse is applied. In this way, the number of pulses when switching from cooling to heating is made greater than the number of pulses when switching from heating to cooling.

Similar to FIG. 1, FIG. 3 shows pulses when switching from the cooling operation position to the heating operation position, and in this case, a long pulse of 1 second is applied. Similar to FIG. 2, FIG. 4 shows pulses when switching from the heating operation position to the cooling operation position, and in this case, a short pulse of 100 m5ec is applied.

In this way, the length of the pulse when switching from cooling to heating is made longer than the length of the pulse when switching from heating to cooling.

As described above, in these embodiments, the total energization time applied to the four-way valve when switching from the cooling operation position to the heating operation position is different from the total energization time applied to the four-way valve when switching from the heating operation position to the cooling operation position. Since the total energization time is longer than the total energization time, the valve can be driven with a strong force, and even if the valve is difficult to operate at the time of energization, since it is energized for a long time, it can be operated reliably afterwards.

Therefore, when switching the four-way valve from the cooling operation position to the heating operation position in winter, even if the viscosity of the refrigerating machine oil in the refrigerant decreases, the valve can be reliably operated and switched.

In the above embodiments, switching of a four-way valve is described, but the present invention is not limited to this, and any direct-acting switching valve may be used.

Further, the number of pulses and the length of energization are not limited to those described above, and the outside temperature may be detected by a sensor or the like, and the number of pulses and the energization time may be changed accordingly.

〔Effect of the invention〕

As explained above, according to the present invention, the total energization time when switching from the cooling operation position to the heating operation position is made longer than the total energization time when switching from the heating operation position to the cooling operation position. from,
In addition to being able to drive the valve with strong force, even if the valve is difficult to operate at the time of energization, it is energized for a long time, so
After that, it can be operated reliably, and therefore, when switching the switching valve from the cooling operation position to the heating operation position in winter, the effect can be obtained that the valve can be operated and switched reliably.

[Brief explanation of the drawing]

1 to 4 are diagrams showing an embodiment of the present invention, in which FIG. 1 is a diagram showing a large number of pulses applied to the switching valve when switching from the cooling position to the heating position, Figure 2 shows the pulses applied to the switching valve when switching from the heating position to the cooling position, and Figure 3 shows the long pulses applied to the switching valve when switching from the cooling position to the heating position. Figure shown, 4th
The figure shows the pulses applied to the switching valve when switching from the heating position to the cooling position.
The figure shows an example of the refrigeration circuit of an air conditioner. Figures 6 and 7 are cross-sectional views of an example of the electromagnetic switching valve. Figure 6 is a diagram showing the state during cooling operation. FIG. 3 is a diagram showing the state of heating operation. 14...Four-way valve. Applicant's agent Mr. Sato

Claims (1)

[Claims] In a method for driving a direct-acting electromagnetic switching valve for switching between heating operation and cooling operation in a refrigeration circuit of an air conditioner, an electric current is applied to the direct-acting electromagnetic switching valve when switching from a cooling operation position to a heating operation position. A method for driving a direct-acting electromagnetic switching valve, characterized in that the total energizing time to be applied to the direct-acting electromagnetic switching valve is longer than the total energizing time applied to the direct-acting electromagnetic switching valve when switching from a heating operation position to a cooling operation position.