JPH03153983A - Reversible valve - Google Patents

Abstract

PURPOSE:To control refrigerant circulation using one valve of simple construction by fixing two communication holes with possibility of communicating to one of the piston chambers in a valve element, and providing a passage to couple one of these communication holes with a pilot valve. CONSTITUTION:Two communication holes 2a, 2b are fixed to the lower side part and the bottom of a valve element 1. When current is fed to a solenoid, a pilot port 13b is opened by a ball 9b, and thereby refrigerant flows into the upper part of a piston 4 via said pilot port 13b and another 13a. The refrigerant in the upper part of piston depresses a sub-port valve 6, which is thus shut to stop the flow of refrigerant. Thus the circulation of refrigerant is controllable using one valve of simple construction.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to air conditioning equipment. The present invention relates to a reversible valve used in a multi-type heat pump, and particularly to a reversible valve for controlling the circulation of refrigerant to an indoor unit during cooling of one room of a multi-air conditioner and during the I11 room.

[Prior Art and Problems to be Solved by the Invention] Traditionally, a two-way valve or an electromagnetic double-controlled valve has been used in the area where the reversible valve of the present invention is to be used, but in a heat pump, Since the flow is reversed, a single electromagnetic two-way valve cannot control the flow in the opposite direction, so tf[
Two two-way valves were used to control the flow of refrigerant. In addition, when using an improved two-way valve, the flow of refrigerant in the main boat can be controlled with a single electromagnetic two-way valve, but if refrigerant flows in from the opposite direction, the main boat is closed, but Since the refrigerant flowing from the pilot boat to the upper part of the 70-boat flows into the forward direction side introduction pipe through the gap between the float and the body, the flow of refrigerant cannot be stopped. Furthermore, when a solenoid valve is used, a pipe that must always be at low pressure or a pipe that must always take in high pressure is required, and the installation position is determined naturally, and it is difficult to improve. However, the electromagnetic double-opening valve had problems such as a complicated structure and an expensive price.

[Means for Solving the Problems 1] The present invention satisfies the functions of a reversible valve and a double-stop valve by using a piston seal, and eliminates the need for a 1r1 pressure or low pressure outlet, thereby making it easier to handle the problem in relation to the compressor. The reversible valve eliminates restrictions on position and can control the circulation of the refrigerant with a single valve with a simple structure, making it possible to provide a reversible valve that is advantageous both in terms of space and time.

[Implementation VA1 Embodiments of the present invention will be described below with reference to the drawings.

In the reversible valve according to the present invention, two communication ports 2a and 2b are fixed to the lower side and the bottom of the valve body, respectively, and inside the valve body there are a piston 4, a sub-boat valve 6, and a spring 7. The piston assembly includes a guide 3 to which the seven-piece assembly is fixed, and a guide 5 provided with a sub-boat 6a. Pilot boat 13a, 13
b is the screw l- in the valve body, as shown in FIG.
The upper chamber and the pilot valve 14, the pilot valve 14
The capillary tube 10 is provided so as to communicate with the capillary tube 10. Further, the other end of the capillary tube 1o is connected to a conduction port 2b. A spring 8 is provided above the piston assembly within the valve body 1 so as to push the piston assembly downward. Pilot valve 14
Yes! 1) A spring 11 is inserted into the iron core 9a so as to push the movable iron core 9a in a direction away from the fixed iron core 12. At the end of the movable core 9a opposite to the spring 11, there is a capillary tube 10 and the movable core 9a.
Ball 9 for opening communication with the room containing a.
b is fixed.

When high-pressure refrigerant flows in from the communication port 2a, the refrigerant 1 flows into the lower part of the piston 4 in the valve body 1, passes through the sub-boat 6a, pushes up the sub-boat valve 6, flows into the upper part of the piston, and further pushes the pilot boat 13a. and flows into the chamber in which the movable iron core 9a of the pilot valve 14 is housed. When the solenoid coil S is de-energized, the movable core 9a is pushed downward by the action of the subring 11 within the pilot valve, and the ball 9b fixed to the tip opens the pilot boat 13b. The inside of the valve body 1 has the same pressure above and below the piston 4, and the piston assembly has communication ports 2a, 2.
It remains pressed down due to the pressure difference b and the action of the spring 80, and the flow of refrigerant stops. Here, the spring 11 can flow through the pilot boat 13a into the chamber in which the iJIrX core 9a of the pilot valve 14 is housed! 71 is selected to have a force greater than the force of the refrigerant that attempts to push up the bolt core 9a.

Next, when the solenoid coil is energized, the movable core 9a is attracted to the fixed core 12 against the force of the spring 11, and the ball 9b opens the pilot boat 13b.

Therefore, the refrigerant above the piston is transferred to the pilot boat 13.
a, 13b, and flows through the capillary tube 10 to the communication port 2b. Here, the opening cross-sectional area S1 of the sub-boat 6a, the opening cross-sectional area S2 of the pilot boats 13a and 13b, and the cross-sectional area S3 of the inner diameter of the capillary tube 10 have a mutual relationship such that Sl<82<83. Because of the appropriate selection, the flow rate flowing from the top of the piston through the pilot boats 13a, 13b and the capillary tube 1o to the communication port 2b is larger than the flow rate flowing from the bottom of the piston through the sub-boat 6a to the top of the piston. , the pressure at the top of the piston is low. Due to the pressure difference between the upper and lower parts of the piston, the piston assembly moves upward against the force of the spring 8, and as the contact between the guide 5 and the valve body 1 is released, the F part of the piston 4 is released from the communication port 2a. A refrigerant flow path leading to the conduction port 2b is formed through the room, and the refrigerant flows from the conduction port 2a to the conduction port 2b. When the solenoid S is de-energized, the ball 9b is
In order to close the pilot boat 13b and cut off the refrigerant flow path from the top of the piston to the communication port 2b, the pressure above and below the piston in the valve body becomes the same, and the piston assembly is pushed by the action of the spring 8. The guide 5 closes the boat on the side of the communication port 2b and stops the flow of refrigerant from the communication port 2a to the communication port 2b.

On the other hand, if high-pressure refrigerant flows in from the conduction [12b], the solenoid S is de-energized and the ball 9b is connected to the pilot boat 13.
When the refrigerant is being fed, the piston assembly is pushed up due to the pressure difference between the conduit port 2a side and the conduit port 2b side, and the refrigerant flows from the conduit port 2b to the conduit port 2a, and even after flowing into the lower part of the piston, the piston assembly The piston assembly remains pushed up by the force of the refrigerant flowing in, and the refrigerant continues to flow from the communication port 2b to the communication port 2a.

Next, when the solenoid is energized, the ball 9b opens the pilot boat 13b, thereby opening the capillary duplex 10 and the pilot boat 13b.

The refrigerant flows into the upper part of the piston 4 through 13a, and the piston assembly is pushed down due to the area ratio between the upper part of the piston and the boat on the side of the communication port 2b and the action of the spring 8.
The boat on the side of the communication port 2b is closed, and the flow of refrigerant from the lower part of the piston to the upper part of the piston is stopped because the high-pressure refrigerant in the upper part of the piston pushes down the sub-boat valve 6 and engages the sub-boat valve, and the flow of refrigerant is stopped. Stop.

With the above method, when the solenoid is energized, the conduction port 2a
A reversible valve can be formed such that the refrigerant flows from the conduction port 2b to the conduction port 2b, and when the solenoid is not energized, the refrigerant flows from the conduction port 2b to the conduction port 2a.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of a reversible valve according to the present invention. 1... Valve body, 2a, 2b... Conduction port, 3.5...
Guide, 4...Piston, 6...Sub boat valve, 6
a...Sub boat, 7...Spring, 8.11.
...Spring, 9a...Movable core, 9b...Ball, 10...Capillary duplex, 12...Fixed core, 13a, 13b...Pilot boat, 14...
・Pilot valve, S...Solenoid coil.

Claims (1)

[Claims] (1) In a reversible valve consisting of a valve body with a piston assembly inside, a pilot valve, and two communication ports in which the high-pressure port and low-pressure port are reversed, the two communication ports can communicate with one piston chamber within the valve body. the piston assembly has a passage communicating between the one piston chamber and the other piston chamber in the valve body, the other piston chamber in the valve body, the pilot valve, and the one piston. A reversible valve characterized in that it has a passage connecting the pilot valve and one of the two communication ports fixed so as to be able to communicate with the chamber.