JPH0320706Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a flow control valve that is connected to a refrigerant circuit of a heating and cooling system and used to control the flow rate of refrigerant. Figure 1 shows a typical example of a heat pump system. In the figure, A is a variable capacity compressor, B is a four-way switching valve, C is an outdoor heat exchanger, D is a flow control valve, E is an indoor heat exchanger, F is an accumulator, G is a room temperature sensor, and H is a controller that changes the capacity of the compressor according to the temperature signal from the sensor G, and also controls the flow control valve D to an opening degree according to the capacity, and can also detect the valve position of the flow control valve D. It's becoming like that. This relationship is shown in the table below, and will be explained below based on this table.

[Table] Next, the operation of the above system will be explained. First, during cooling operation, the refrigerant discharged from the compressor A flows as shown by the solid arrow, and the high-temperature, high-pressure gas refrigerant discharged from the compressor A passes through the four-way switching valve B and is cooled by the outdoor heat exchanger C. , the pressure is further reduced by the flow rate control valve D, which is an expansion valve, and the gas flows into the indoor heat exchanger E. The indoor heat exchanger E heats the refrigerant, which turns it into a low-pressure gas refrigerant, which passes through the four-way switching valve B and is sucked into the compressor A via the accumulator F. When the above system is operated and the temperature is, for example, 29°C, the controller H controls the compressor A to have a capacity of 75% and a flow rate control valve opening of 75%. If the room temperature drops to 27°C from this state, the controller H will control the compressor A to have a capacity of 50% and a flow rate control valve opening of 50%. In other words, the height of the room temperature detected by the room temperature sensor G is regarded as the magnitude of the load, and the capacity of the compressor is varied according to the magnitude of the load, and the opening degree of the flow control valve is varied, thereby controlling the refrigerant in the compressor. The degree of throttling is appropriate depending on the discharge amount, and efficient cooling operation can be performed. In addition, in heating operation, by switching the four-way switching valve B, the operation is performed in the opposite direction to the above-mentioned operation.
That is, the refrigerant flows in the direction shown by the dotted line to perform heating. By the way, in the above system, a method has been used in which a proportional control valve such as an electromagnetic proportional valve or a pulse motor valve, or several capillary tubes having different flow path resistances are selected as the flow rate control valve D. In an electromagnetic proportional valve, the core moves against the spring force by varying the voltage applied to the electromagnetic coil that makes up the electromagnet, which causes the valve stem to approach or separate from the valve seat. A pulse motor valve rotates a rotating shaft in proportion to the number of pulses applied to the pulse motor, and converts this rotational force into linear motion to move the valve stem closer to the valve seat, or It is something that makes you go away. However, the electromagnetic proportional valve described above requires a precise structure to faithfully convert the input voltage into the valve opening degree, and must always be energized when controlling the valve, which reduces cost and energy savings. There was a problem. Further, in the case of the pulse motor valve, the valve structure is complicated, and the control of the valve is also considerably complicated, which poses a problem in terms of cost. Furthermore, the method of selecting a capillary tube has the advantage of not requiring special equipment, but it requires the use of several solenoid valves for selection, which poses problems in terms of cost and installation space. It was hot. The present invention was developed in view of the above points, and its purpose is to reduce costs with a simple structure, and to save energy since electricity is only applied when changing the opening degree of the valve. An object of the present invention is to provide a flow control valve that can achieve a An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. 1 is an excitation coil, 2 is a yoke into which the excitation coil 1 is fitted, and 3 is fixed to the yoke 2 with screws 4, and a plunger tube 5 inside the coil 1.
The suction element 6 inserted into the tube 5 is a plunger that is always biased in the valve closing direction by a spring 7, and the portion protruding from the tube 5 is a small diameter portion 6a. , and its tip is formed into a conical shape and serves as a valve portion 6b. Further, a pin 6c is fitted into the small diameter portion 6a. Reference numeral 8 denotes a valve body fitted to the outer periphery of the tube 5 protruding from the yoke 2, and includes an insertion hole 8a into which the small diameter portion 6a of the plunger 6 is inserted, and a fitting hole 8b into which the valve seat 9 is fitted. A horizontal hole 8c communicating with the insertion hole 8a is formed. A vertical hole 9a is formed in the valve seat 9, and the valve portion 6b of the plunger 6 faces one end of the vertical hole 9a. And this valve seat 9
The outflow pipe 10 is fitted into the horizontal hole 8c.
An inflow pipe 11 is fitted into the inflow pipe 11 . 12 is a stopper fixed in the valve body 8 in contact with the tube 5, and 13 is an annular guide fitted in the insertion hole 8a of the valve body 8 between the stopper 12 and the step 8d. The fixture has an annular recess 13a formed in the center of its inner peripheral surface. Reference numerals 14 and 15 designate annular first and second guides having sawtooth step portions 14a and 15a, which are fixed to the inner periphery of the guide fixture 13 at a predetermined interval. Note that the second guide 15 has sawtooth-shaped step portions 15a whose heights change sequentially, and step portions 15a of the same height.
are formed opposite each other in symmetrical positions rotated by 180°. In addition, the first and second guides 14 and 15 have peak portions 14b and 15b on one side and valley portions 15c and 14c on the other side.
It is placed offset by a half pitch so as to correspond to the center of the . Then, this first guide 14 and the second guide
The pin 6c of the plunger 6 is located between the stepped portions 14a and 15a of the guide 15. Therefore, since the plunger 6 is pressed by the spring 7, the pin 6c is in contact with one of the step portions 15a of the second guide 15. Next, the operation will be explained based on the above structure. When current to the coil 1 is cut off, the valve portion 6b of the plunger 6 is pressed toward the valve seat 9 by the spring force of the spring 7. At this time, the pin 6c fixed to the plunger 6
contacting any of the valley portions 15c of the step portion 15a of No. 5,
The position of the plunger 6 is determined by the depth of the valley portion 15c, and therefore the gap between the valve portion 6b and the valve seat 9 is determined by this discharge amount. Next, when the controller H in the system shown in FIG. 1 outputs a valve opening signal, the controller H supplies current to the coil 1. When current flows through the coil 1, the plunger 6 is attracted against the spring force of the spring 7. When the plunger 6 is sucked, the pin 6c is attached to the first guide 14.
Therefore, the plunger 6 rotates as it rises (as shown in FIG. 2), and the pin 6c is located in the trough 14c, and the plunger 6 contacts the suction element 3. It will stop when it makes contact. Then, when the current to the coil 1 is cut off, the plunger 6 is pushed down by the spring force of the spring 7. When the plunger 6 is lowered, the pin 6c is attached to the stepped portion 15 of the second guide 15.
The plunger 6 comes into contact with the slope of the peak 15b at point a, and therefore the plunger 6 rotates as it descends, and the pin 6c
It stops when it is located at the trough 15c. here,
The trough 15c in which the pin 6c is located is formed in five stages, so if the previously located trough 15c is the lowest, it moves to the next second lowest trough 15c, and so on. It moves to the higher valleys 15c in sequence, and if it is located at the highest valley 15c, it moves to the lowest valley 15c. Further, when a signal to close the valve is output from the controller H, the above-described operation is repeated four times, and eventually the valve moves to the previous trough portion 15c. In addition, in the above-mentioned embodiment, explanation has been given of the control of the opening degree of the valve in five stages, but this is due to the step portions 14a, 15a of the first and second guides 14, 15.
By forming a large number of valve openings, the valve opening degree can be freely adjusted. As described above, the present invention biases the plunger in one direction by elastic force, and provides a first guide so that rotational force is applied to the plunger when the coil is energized, and also cuts off the energization to the coil. By providing a second guide that restricts the amount of movement of the plunger when the plunger is pressed by the elastic force, the valve body formed or attached to the lower end of the plunger and the valve body formed or attached to the lower end of the plunger each time the coil is energized. The gap between the opposing valve seat changes to increase or decrease in sequence, and therefore electricity is applied only when changing the opening degree of the valve, and no power is supplied in a stable state, making it possible to save energy. Since the structure is simple, it has the effect of reducing costs.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing a heat pump system.
Fig. 2 is a cross-sectional view of the flow control valve according to the present invention;
The figure is a perspective view of the first and second guides, and FIG. 4 is a developed view of the same. DESCRIPTION OF SYMBOLS 1... Coil, 6... Plunger, 6b... Valve part, 7... Spring, 9... Valve seat, 14... First guide, 15... Second guide.

Claims (1)

[Claims for Utility Model Registration] A valve body having an excitation coil, an inflow pipe and an outflow pipe attached to the lower end of the excitation coil, and a valve body that is inserted into the excitation coil so as to be movable up and down, and when the excitation coil is energized. a plunger that is attracted and whose tip portion faces into the valve body; an elastic body such as a spring that biases the plunger in a direction opposite to the suction direction; and a valve body formed at the lower end of the plunger; A flow control valve having a valve seat formed on the valve body at a position facing the valve body, comprising: a pin attached to a lower part of the plunger; When the plunger is attracted, the pin contacts the crest to rotate the plunger in one direction, and when the pin is located at the trough, the plunger stops moving. 1 guide, and the ridges and troughs of the stepped portion of the first guide are also arranged to be shifted by a half pitch so that the troughs and the ridges face each other, and the depth of the trough is When the plunger is lowered by the biasing force of the spring, the pin contacts the peak and rotates the plunger in the same direction as the rotation direction, so that the pin is located in the valley. a second guide formed with a serrated step portion that stops the movement of the plunger when the valve body is in a state where the pin is located at the deepest valley in the second guide; A flow control valve characterized in that it comes into contact with a seat and is fully closed.