JP2580210B2 - Five-way reversing valve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a five-way reversing valve with a defrosting valve used in a reversible refrigeration cycle of a cooling / heating switching type.

2. Description of the Related Art Conventionally, when removing frost adhering to an outdoor heat exchanger used as an evaporator during a heating operation of a reversible refrigeration cycle, the outdoor heat exchanger is operated by operating a switching valve to switch to a cooling operation. It is used as a condenser and is defrosted by its heat generation.

However, this method has drawbacks such as generation of loud noise due to the high pressure flow when the switching valve is operated, and switching to the cooling operation for a short time, so that the device cannot be operated efficiently.

Problems to be Solved by the Invention The present invention has been made by focusing on the above points,
In the operating state of the refrigeration cycle in the heating operation, the defrosting valve of the five-way switching valve is operated to send high-pressure gas to the outdoor heat exchanger for defrosting.

Means for Solving the Problems In order to achieve the above object, in the present invention, the inside of a cylindrical reversing valve body is partitioned into a high-pressure chamber and a pressure conversion chamber by a piston, and the high-pressure chamber is provided for a discharge pipe of a compressor. A connection port, a connection port for a suction pipe of the compressor, and a connection port for two heat exchanger conduits both indoor and outdoor with the connection port interposed therebetween; and two heat exchanger conduits from the connection port for the suction pipe A series of switching valve seats are provided over the connection port to the valve, a slide valve that slides on the switching valve seat is connected to the piston, and a pressure equalizing hole that connects the high pressure chamber and the pressure conversion chamber to the piston is formed. A pressure spring having a larger diameter than the pressure equalizing hole and connecting a conduit communicating with the suction side of the compressor to the pressure conversion chamber. In another conduit to A defrosting valve for providing a separate connection port to the other pressure conversion chamber and biasing the high pressure chamber by a spring between the other pressure conversion chamber and the high pressure chamber and opening and closing the another connection port in conjunction with the piston member A conduit communicating with the suction side of the compressor is connected to the other pressure conversion chamber, and a three-way solenoid valve is interposed between the two conduits communicating with the suction side of the compressor; During the operation, the pressure conversion chambers are connected to the suction side of the compressor.

In Figure 1 through Figure 4 embodiment, V ₁ is five-way reversing valve, V ₂ denotes a three-way solenoid valve.

Reference numeral 1 denotes a cylindrical reversing valve main body, and plugs are provided at both ends.
A few are provided. In the reversing valve body 1, the discharge pipe 5 of the compressor 4 is connected to one side of the peripheral surface, and two conduits 7, 8 are linked. The conduits 7, 8 are connected to an outdoor heat exchanger 9 and an indoor heat exchanger 10, which are used in reverse as a condenser or evaporator. The suction pipe 6 and the inner ends of the conduits 7 and 8 are the reversing valve body 1
The three through holes 11a, 11b,
11c, a series of smooth surfaces 11d inside the valve seat 11.
Is formed.

In reversing valve main body 1, a piston 12 is slidably provided in between the valve seat 11 and the stopper 3, which partitions the reversing valve body 1 into the high pressure chamber R ₁ and the pressure transducer chamber R _2. A compression spring 13 is provided between the piston 12 and the plug 3, and the piston 12
R Always biased in the ₁ direction. High pressure chamber R _{1 in} piston 12
And the equalizing hole 12a for always communicated is formed a pressure transducer chamber R _2, the plug 3 is connected to a conduit 14 having a larger pressure relief port 14a of the diameter than the homogeneous pressure hole 12a.

The conduit 14 is connected to port A of pilot three-way electromagnetic valve V _2, the port C of the pilot three-way electromagnetic valve V ₂ conduit 15 leading to the suction side 6 of the compressor 4 is connected.

A slide valve 16 having a communication lumen 16a is provided on the valve seat 11, and the slide valve 16 is connected to the piston 12 by a connecting rod 17. The slide valve 16 is moved to move the suction pipe 6 in the valve seat 11 through the lumen 16a.
Is selectively communicated with through holes 11b and 11c for conduits 7 and 8 to the heat exchangers on both sides thereof.

In the plug 2 side, located in the high-pressure chamber R ₁ cylinder 18
Piston 19 having a pressure equalization hole 19a is in the cylinder 18 is slidably provided, for partitioning the pressure transducer chamber R ₃ between the plug body 2 with is provided. The piston 19 abuts the stopper 18a is always urged high pressure chamber R ₁ direction by a compression spring 20 provided between the plug 2.

A through hole 11f is formed in an extension of the valve seat 11, and a defrosting valve 2 that opens and closes the through hole 11f on the valve seat 11.
1 is provided and connected to the piston 19 by the connecting rod 22. A conduit 24 connected to a pipeline between the outdoor heat exchanger 9 and the throttle means 23 is connected to the through hole 11f, and the pressure conversion chamber R ₃
Port B of the pilot three-way solenoid valve V ₂ via the plug 2
A conduit 25 having the same pressure relief port 25a as described above is connected.

The three-way solenoid valve V ₂ is the solenoid coil 28 via the plunger tube 27 to the valve body 26 is coupled.

The port A the valve chamber R ₄ of the valve body, B, C is opened, the inner end of the port C is formed with a valve seat C '.

The plunger 29 is provided in the plunger tube 27, though the ball valve element 30 in the front end recess 29a of the plunger 29 is fixed to move the valve chamber R ₄ by the operation of the plunger 29, the plunger 29 the suction core 31 Compression spring provided between
The plunger 29 or the ball valve element 30 is constantly urged by the valve 32 in the direction to close the valve seat C '.

FIG. 1 shows a cooling operation state. That is, the pilot three-way electromagnetic valve V ₂ In the non-energized state, since the ball valve element 30 closes the port C, and five-way reversing valve V _1, pressure equalization hole 12
high pressure chamber R ₁ and the pressure transducer chamber R ₂ by a becomes the same pressure, thus forked-shaped end 17a of the piston 12 connecting rod 17 by a spring 13
Is pushed until it comes into contact with the cylinder 18, and the slide valve 16 communicates with the through hole 11a with the through hole 11c. Therefore, the refrigerant flows from the compressor 4 → the discharge pipe 5 → the conduit 7 → the outdoor heat exchanger 9 → the throttle. Means 23 → indoor heat exchanger 10 → conduit 8 → suction pipe 6 → circulates in the path of compressor 4.

Then, stop the cooling operation, the ball valve body 30 as described above to energize the pilot three-way electromagnetic valve V ₂ is opened to port C pressure relief port 14a, 25a communicates with the low pressure suction side of the compressor 4 . When the compressor 4 is started in this state, the high pressure in the pressure conversion chambers R ₂ and R ₃ starts flowing out to the suction side of the compressor 4.

In this state, in the pressure conversion chambers R ₂ and R ₃ , the refrigerant escapes from the pressure relief ports 14 a and 25 a to the suction side, and at the same time, the high pressure chamber R ₁
Refrigerant is supplied through more equalizing holes 12a, 19a, and at this time, the diameter of pressure release ports 14a, 25a is larger than the diameter of equalizing holes 12a, 19a, and the discharge amount is smaller than the supply amount of refrigerant. Because it ’s big
The pressure conversion chambers R ₂ and R ₃ have a lower pressure than the high pressure chamber R ₁ , and the chambers R ₁ and R 3
_A differential pressure that overcomes the elasticity of the compression springs 13 and 20 is generated between ₂ and R ₃ , and the piston 12 to the slide valve 16 start moving in the direction of the plug 3. Similarly, the piston 19 to the defrosting valve 21 move toward the plug 2.

After about 1 minute by energizing the pilot three-way electromagnetic valve V _2, the piston 12 through the slide valve 16 through hole 11a hole 1
The refrigerant is communicated to 1b, and the refrigerant flows from the compressor 4 → the discharge pipe 5 → the conduit 8 → the indoor heat exchanger 10 → the throttle means 23 → the outdoor heat exchanger 9 →
The operation shifts to a heating operation of circulating along the path of the pipe 7 → the suction pipe 6 → the compressor 4 (FIG. 2).

In the transition stages to the heating operation state, the pilot three-way solenoid valve V ₂ and not energized, the valve port C closes. In this case, the pressure difference or the like of the slide valve 16 and out to overcome the pressure of the pressure transducer chamber R ₂ side, including the compression spring 13 to secure the piston 12 to slide valve 16. On the other hand, the piston 19 to the defrosting valve 21 return to the valve closed position in FIG. 1 (FIG. 3).

In the heating operation state, when the frost adhering to the outdoor heat exchanger 9, to open the port C as described above by energizing the pilot three-way electromagnetic valve V _2, while fixing the slide valve 16, for defrosting The valve 21 is opened, and high-pressure gas is sent from the conduit 24 to the outdoor heat exchanger 9 to perform defrosting. Detects the end of defrosting, when cut off the power supply to the pilot three-way electromagnetic valve V _2, defrosting valve 21 is closed (FIG. 4).

Advantageous Effects of the Invention As described above, the present invention divides the inside of a cylindrical reversing valve body into a high pressure chamber and a pressure conversion chamber by a piston, and connects the high pressure chamber with a connection port for a discharge pipe of a compressor and a suction port of a compressor. A connection port and a connection port for two heat exchanger conduits inside and outside the room are provided with the connection port interposed therebetween, and a series of switching valve sheets are provided from the connection port for the suction pipe to the connection port for the two heat exchanger conduits. The slide valve that slides on the switching valve seat is connected to the piston, a pressure equalizing hole that connects the high pressure chamber and the pressure conversion chamber is formed in the piston, and a spring that biases the piston in the high pressure chamber direction is provided. A conduit communicating with the suction side of the compressor having a pressure relief port having a diameter larger than that of the pressure equalizing hole is connected to the conversion chamber, and another connection port for another conduit leading to the outdoor heat exchanger is provided in the high pressure chamber. Provide other pressure conversion A piston member urged in the direction of the high-pressure chamber by a spring between the chamber and the high-pressure chamber, and a defrosting valve for opening and closing the other connection port in conjunction with the piston member; A three-way solenoid valve is interposed between the two conduits communicating with the suction side of the compressor, and the two pressure conversion chambers are connected to the compressor when the three-way solenoid valve operates. The defrosting of the outdoor heat exchanger can be performed while the heating operation is being performed, and the defrosting valve is operated by using the cooling / heating switching electromagnetic valve at this time. Since it can be operated, it has features that the operation is easy and the mechanism can be simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIGS. 2 to 4 are operating state diagrams of the same, and FIG. 5 is an enlarged sectional view of a defrosting valve portion. V ₁ … Five-way reversing valve, V ₂ … Three-way solenoid valve, 1… Reversing valve body, 4… Compressor, 5… Discharge pipe, 6… Suction pipe, 7, 8
... conduit, 9 outdoor heat exchanger, 10 indoor heat exchanger,
11 ... switching valve seat, 12 ... piston, 12a ... equalizing hole, 13 ... compression spring, 14 ... conduit, 14a ... pressure relief hole, 16 ... slide valve, 19 ... piston member, 20…
… Compression spring, 21 …… defrosting valve, 24 …… a separate conduit, R ₁ ……
High pressure chamber, R ₂ , R ₃ … Pressure conversion chamber.

Claims (1)

(57) [Claims] A cylinder-shaped reversing valve body is divided into a high-pressure chamber and a pressure conversion chamber by a piston, and the high-pressure chamber has a connection port for a discharge pipe of a compressor, a connection port for a suction pipe of the compressor, and the connection port. A connection port for the two heat exchanger conduits inside and outside the room is provided with the connection therebetween, and two connection ports for the suction pipe are provided from the connection port for the suction pipe.
A series of switching valve seats are provided across the connection ports for the heat exchanger conduits, a slide valve that slides on the switching valve seat is connected to the piston, and a pressure equalizing hole is formed in the piston to allow communication between the high-pressure chamber and the pressure conversion chamber. A spring for urging the piston toward the high pressure chamber is provided, and a conduit having a pressure relief port having a diameter larger than that of the pressure equalizing hole and communicating with the suction side of the compressor is connected to the pressure conversion chamber. A separate connection port for another conduit leading to the outdoor heat exchanger is provided in the room, and a piston member urged in the direction of the high-pressure chamber by a spring between the other pressure conversion chamber and the high-pressure chamber and the piston member are interlocked with the piston member. A defrosting valve for opening and closing another connection port is provided, a conduit communicating with the suction side of the compressor is connected to the other pressure conversion chamber, and between the two conduits communicating with the suction side of the compressor. With the three-way solenoid valve interposed, when the three-way solenoid valve operates Square reversible refrigeration cycle for five-way reversing valve, characterized in that to communicate with the suction side of the compressor pressure transducer chamber.