JP3011859B2 - Electric flow control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric flow control valve used for controlling a flow rate of a refrigerant used in a refrigeration cycle.

[0002]

2. Description of the Related Art A conventional motor-operated flow control valve disclosed in Japanese Patent Application Laid-Open No. 6-174129 has a primary port and a secondary port communicating with a valve chamber, and a communication valve port is provided in a secondary port side partition. A valve body, a valve body (needle valve) for controlling the flow rate of the liquid refrigerant flowing into the valve chamber of the valve body, a closed case fixed to an outer portion of the valve body, and disposed outside the case. A stepping motor having a stator coil and provided inside the case with a rotor that can be moved in the valve opening and closing direction rotated by energization of the stator coil and a screw feed action by the rotation of the rotor of the stepping motor; A valve actuating mechanism for opening and closing, the valve actuating mechanism having a female thread inside, a cylindrical bush fitted into the valve chamber opening of the valve body, and screwed into the bush female thread. Ryu Parts is composed of a center valve holder which is coaxially fixed to the rotor has a has a configuration obtained by holding the valve body to the valve holder.

[0003]

The conventional motor-operated flow control valve has no problem when only liquid refrigerant flows into the valve chamber of the valve body. However, when the valve element enters the valve port, there is no problem. When the gas-liquid mixed refrigerant of the gas refrigerant and the liquid refrigerant flows into the liquid refrigerant, the gas refrigerant enters the liquid refrigerant at the valve constriction portion to form bubbles, and when the liquid refrigerant containing the bubbles flows out of the main body valve opening, the liquid refrigerant However, there is a problem that the gas bubbles burst and generate noise. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described conventional problem, and an object of the present invention is to provide an electric flow control valve capable of suppressing generation of noise due to burst of bubble gas.

[0004]

In order to achieve the above object, a valve body A having a primary port Pa and a secondary port Pb communicating with the valve chamber 1 and having a communication valve port 3 in a secondary port side partition wall is provided. A valve body 5 for controlling the flow rate of the liquid refrigerant flowing into the valve chamber 1 of the valve body; and a closed case 6 fixed to an outer portion of the valve body A.
And a rotor 1 having a stator coil 9 disposed outside the case and having a position movable in a valve opening / closing direction rotated inside the case 6 by energization of the stator coil 9.
0, and a valve operating mechanism B for opening and closing the valve element 5 by a screw feed action by the rotation of the rotor of the stepping motor, and the valve operating mechanism B has a female screw portion 15a inside. A cylindrical bush 15 fitted into the valve chamber opening of the valve body A, and a male thread 16a screwed into the bush female thread 15a are fixed concentrically to the center of the rotor 10. And a valve holder 16 holding the valve element 5 in the valve holder 16.
A gas refrigerant passage 18 through which the gas refrigerant G in the gas-liquid mixed refrigerant flowing into the valve chamber 1 flows into the inner bottom space 7a of the case 6; A communication hole 19 through which the gas refrigerant G (indicated by a dotted line in FIG. 1) flowing into the portion 7a flows into the holder is provided, and the gas refrigerant G flowing into the holder is provided at a central portion of the valve body 5 through a secondary port. An outflow hole 20 for outflow to the Pb side is provided.

[0005]

According to the electric flow control valve having the above-described structure, the gas refrigerant G and the liquid refrigerant W (shown by solid lines in FIG. 1) are stored in the valve chamber 1 of the valve body A with the valve body 5 entering the valve port 3. When the gas-liquid mixed refrigerant flows in, the liquid refrigerant W flows out to the secondary port Pb side through the valve throttle portion, but the gas refrigerant G separated from the liquid refrigerant flow is the valve body A.
Gas refrigerant passage 18 → the inner bottom space 7a of the closed case 6 →
Through a gas flow path from the communication hole 19 of the valve holder 16 to the outflow hole 20 at the center of the valve body, the gas flows out from the valve body outflow hole 20 to the secondary port Pb side. For this reason, the conventional problem that the gas refrigerant G enters the liquid refrigerant W in the valve constriction portion and becomes bubbly and bursts does not occur, and generation of noise due to rupture of the bubble gas can be suppressed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to FIGS. In the figure, A is a valve body, having a primary port Pa for refrigerant inflow and a secondary port Pb for refrigerant outflow communicating with the valve chamber 1, and having a configuration in which a communication valve port 3 is provided in a secondary port side partition. Has become.

Reference numeral 5 denotes a valve body for controlling the flow rate of the liquid refrigerant flowing into the valve chamber 1 of the valve body A, M denotes a stepping motor, and the stepping motor M is a secondary port Pb of the valve body A.
And a stator coil 9 disposed outside of the sealed case, the valve being rotated by energization of the stator coil 9 inside the case 6. The rotor 10 is configured to be movable in the opening and closing directions.

The closed case 6 comprises a lower lid 7 and a can 8, and the rotor 10 comprises a sleeve 11 made of synthetic resin.
And a cylindrical permanent magnet 12 integrally inserted and fixed to the outside of the sleeve, and a central shaft 13 for rotatably and vertically moving the rotor 10 on a can bearing 14 is fixed to the sleeve 11. ing.

Reference numeral B denotes a valve operating mechanism for opening and closing the valve element 5 by a screw feed action caused by the rotation of the rotor of the stepping motor M. Cylindrical bush 15 to be fitted to
And a cylindrical valve holder 16 having a male screw portion 16a screwed into the bush female screw portion 15a and concentrically embedded and fixed in the center of the rotor 10 (sleeve 11). The valve body 5 is fitted into a lower end opening of the valve body 16.

The screw length of the female screw portion 15a and the male screw portion 16a is set to be the same as or slightly longer than the opening / closing stroke of the valve body 5. When the valve body 5 is fully opened, the holder male screw portion 16a is moved from the bush female screw portion 15a. A return spring 17 supported at the rear end of the sleeve is incorporated in the outer periphery of the rotor center shaft 13 so as to be disengaged.

When the valve body 5 is closed, the return spring 17 separates from the can bearing 14 as shown in FIG. 1, and when the valve body 5 is fully opened, it comes into contact with the can bearing 14 as shown in FIG. The rotor 10 and the valve holder 16 are urged in a direction in which the male screw portion 16a of the holder meshes with the female screw portion 15a of the bush.

In the present invention, the gas refrigerant passage 1 through which the gas refrigerant G in the gas-liquid mixed refrigerant flowing into the valve body A into the valve body A flows into the inner bottom space 7 a of the case 6.
And a communication hole 19 having a hole diameter of about 1 to 2 mm capable of gas-liquid separation for allowing the gas refrigerant G flowing into the space 7a to flow into the holder at an exposed portion in the case of the valve holder 16; Outflow hole 20 for allowing gas refrigerant G flowing into holder 16 to flow out to secondary port Pb side at the center of valve body 5
Is provided.

With this configuration, the gas-liquid mixed refrigerant of the gas refrigerant G and the liquid refrigerant W flows into the valve chamber 1 of the valve body A just before the valve is fully closed as shown in FIG. In this case, the liquid refrigerant W flows out to the secondary port Pb side through the valve throttle portion as shown by the solid line in FIG. 1, but the gas refrigerant G separated from the liquid refrigerant flow is the gas refrigerant passage 18 of the valve body A → the sealed case. 6, inner bottom space 7a → communication hole 19 of valve holder 16 → outflow hole 2 at the center of valve body
The gas flows out from the valve body outflow hole 20 to the secondary port Pb side through the gas flow path 0 as shown by the dotted line in FIG.

For this reason, the conventional problem that the gas refrigerant G enters the liquid refrigerant W at the valve throttle portion and becomes ruptured in the form of bubbles does not occur, and the generation of noise due to the rupture of bubble gas is suppressed. Can be. Such an effect is supported by the noise level measurement results shown in FIGS.

FIG. 3 is an operation explanatory view showing the result of measurement of the noise level by the conventional motorized flow control valve, in which the noise level is taken in the vertical direction and the noise frequency is taken in the horizontal direction. From the measurement results shown in FIG. 3, it can be seen that the noise level is 50 dB in the state immediately before the valve is fully closed and the frequency is in the range of 11 to 18 KH, and high noise is generated.

FIG. 4 is an operation explanatory view showing the result of measurement of the noise level by the motorized flow control valve of the present invention. As in FIG. 3, the noise level is taken in the vertical direction and the frequency of the noise is taken in the horizontal direction. . According to the measurement results shown in FIG. 4, the noise level is about 45 dB in the state immediately before the fully closed state (frequency range of 11 to 18 KH) with the valve opening reduced, and the noise is about 5 dB compared to the conventional electric flow control valve. You can see that it is going down.

[0017]

The motor-operated flow control valve of the present invention is provided with the gas refrigerant passage 18, the communication hole 19, and the outflow hole 20 in the valve body A, the valve holder 16 and the valve body 5 as described above. This eliminates the conventional problem that the gas refrigerant G enters the liquid refrigerant W at the valve constriction portion and becomes bubbly in the form of a bubble, thereby suppressing the generation of noise due to the rupture of the bubble gas.

[Brief description of the drawings]

FIG. 1 is a central vertical sectional view showing an electric flow control valve according to an embodiment of the present invention in a state immediately before closing.

FIG. 2 is a central longitudinal sectional view showing the control valve by opening (fully opening).

FIG. 3 is an operation explanatory view showing a measurement result of a noise level by a conventional electric flow control valve.

FIG. 4 is an operation explanatory diagram showing a measurement result of a noise level by the electric flow control valve of the present invention.

[Explanation of symbols]

A: valve body, 1: valve chamber, Pa: primary port, Pb: secondary port,
3 ... communication valve port, 5 ... valve body, M ... stepping motor, 6
... closed case, 7a ... inner bottom space of the case, 9 ... stator coil, 10 ... rotor, B ... valve operating mechanism, 15 ... cylindrical bush, 15a ... bush female screw part, 16 ... valve holder, 16a ... holder male screw G, gas refrigerant, W: liquid refrigerant, 18: gas refrigerant passage, 19: communication hole, 20: gas refrigerant outlet hole.

Claims (2)

(57) [Claims] 1. A valve body having a primary port and a secondary port communicating with a valve chamber and having a communication valve port on a secondary port side partition, and a flow rate control of a liquid refrigerant flowing into the valve chamber of the valve body. A valve body, a sealed case fixed to an outer portion of the valve body, and a stator coil disposed outside the case. The valve body is positioned inside the case in a valve opening and closing direction rotated by energization of the stator coil. A stepping motor provided with a movable rotor, and a valve operating mechanism for opening and closing the valve element by a screw feed action by rotation of the rotor of the stepping motor, the valve operating mechanism having a female screw portion inside; A cylindrical bush fitted into the valve chamber opening of the valve body;
A valve holder having a male screw portion screwed to the bush female screw portion and fixed concentrically to the center of the rotor, and the valve body is held by the valve holder. A gas refrigerant passage for allowing the gas refrigerant in the gas-liquid mixed refrigerant that has flowed into the valve chamber to flow into the inner bottom space of the case, and flows into the space at an exposed portion of the valve holder in the case; And a communication hole through which the supplied gas refrigerant flows into the holder, and an outflow hole through which the gas refrigerant flowing into the holder flows out to the secondary port side at the center of the valve body. Control valve. 2. The electric flow control valve according to claim 1, wherein the gas-liquid mixed refrigerant flows into the valve chamber while the valve element enters the valve port.