JPH0261473A - Four-way valve for reversible refrigerating cycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-way reversing valve used for switching between air conditioning and heating in a heating and cooling air conditioner.

As shown in the prior art publication No. 60-59876, the interior of the four-way valve is divided into a high pressure chamber and a chamber communicating with the suction side of the compressor by a piston provided with a slider valve at one end, and the communication passage is Cooling and heating are switched by opening and closing, but in this structure, a bleed boat is formed in the piston that communicates with the compartment, and when the communication path is opened, high pressure is generated through the bleed boat. The amount of refrigerant escaping to the suction side of the compressor is larger than the amount of refrigerant flowing in from the chamber to generate a differential pressure on both sides of the piston, and this differential pressure overcomes the spring pressure and moves the piston or slider valve. It is something.

f--Problem to be Solved by the Invention In the above prior art, the piston is provided with a bleed boat, and the amount of inflow from the high pressure side into the chamber partitioned from the high pressure chamber by the piston is greater than the amount of inflow from the high pressure side. Since the pressure is increased by increasing the pressure and the piston is moved based on this, there is a drawback that the switching operation becomes unstable.

The present invention focuses on the above-mentioned points and makes switching entirely by a pilot solenoid valve without providing a bleed port on the piston.

Means for Solving the Problems In order to achieve the above object, in the present invention, a cylindrical reversing valve main body is divided into a high pressure chamber and a pressure conversion chamber by a piston, and a connection to a discharge pipe of a compressor is provided in the high pressure chamber. a connection port for the suction pipe of the compressor, and a connection port for two heat exchanger conduits sandwiching the connection port, and a connection port for the two heat exchanger conduits from the connection port for the suction pipe to the connection port for the two heat exchanger conduits. a switching valve seat is provided, a slide valve that slides in contact with the switching valve seat is connected to the piston,
A spring is provided to urge the piston toward the high pressure chamber, and a configuration is adopted in which the pressure conversion chamber is selectively communicated with the high pressure side and the low pressure side via a pilot solenoid valve.

In the drawings of the embodiment, reference numeral 1 denotes a cylindrical reversing valve body, and plugs 2 and 3 are welded and fixed to both ends thereof. A discharge pipe 5 of a compressor 4 is connected to an example of the circumferential surface of the reversing valve main body 1,
Further, on the other side of the circumferential surface, in the axial direction, there is a suction pipe 6 of the compressor 4.
Two conduits 7.8 are connected between them. The conduits 7, 8 are connected to two heat exchangers 9, 10, indoor and outdoor, which are used reciprocally as condensers or evaporators. The inner ends of the suction pipe 6 and the conduit pipes 7 and 8 are connected to three through holes 11a, llb, and 11C of a switching valve seat 11 fixed in the reversing valve body 1, and a series of holes are provided inside the valve seat 11. A smooth surface lid is formed.

Inside the reversing valve body 1, a piston 12 is slidably provided between the valve seat 11 and the stopper 3, and divides the inside of the reversing valve body 1 into a high pressure chamber R1 and a pressure conversion chamber R2. piston 12
A compression spring 13 is provided between the piston 12 and the plug body 3.
is constantly biased in the direction of the high pressure chamber R1.

A conduit 14 is connected to the stopper 3, and the conduit 14 (port A)
communicates with pipe lines 16 and 17 (ports S and B) leading to the suction pipe 6 and discharge pipe 5 via a pilot solenoid valve 15.

A plunger pipe 19 is connected to the valve body 18 of the pilot solenoid valve 15, and an electromagnetic coil 20 is provided around the plunger pipe 19. A plunger 21 is always urged in the valve closing direction by a compression spring 23 interposed between the plunger 21 and the suction iron core 22. A ball valve 24 is fixed to the tip of the plunger 21 via a small rod portion 21a, and is selectively moved toward and away from opposing valve seats 1-25'a formed on the valve seat 25 and the partition member 25'. The pipe line 16 leading from the valve chamber 26 to the suction pipe 6 and the pipe line 17 leading to the discharge pipe 5 are opened and closed.

A slide valve 27 having a communication bore 27a is provided on the valve seat 11, and the slide valve 27 is connected to the piston 12 by a connecting rod 28. The slide valve 27 moves to the valve seat 1 through its inner cavity 27a.
The through hole 11a for the suction pipe 6 in 1 is alternatively communicated with the through holes 11b and IIC for the heat exchanger conduit 7.8 on both sides thereof.

In the above configuration, FIG. 1 shows the non-energized state and the cooling operation state, in which the ball valve 24 is in contact with the valve seat 25 of the pilot solenoid valve 15, and the ports B-+S, A-3
is closed.

When the compressor 4 is operated in this state, the refrigerant is transferred from the compressor 4→
It circulates along the path of reversing valve zero body 1 → outdoor heat exchanger 9 → throttle 29 → indoor heat exchanger 10 → reversing valve body 1 → compressor 4. At this time, the high pressure refrigerant is transferred from the discharge pipe 5 to the pilot solenoid valve 15.
is introduced into the pressure conversion chamber R2 of the valve body 1 through port B-A of
There is no differential pressure between the two sides, and the piston 12 to the slide valve 27 maintain the same position.

Next, when the pilot solenoid valve 15 is energized and the compressor 4 is started, the ball valve 24 opens the valve seat 25 and closes the valve seat 25'a, opens ports A→S, and opens the pressure conversion chamber R2. The pressure becomes low, and the differential pressure generated between the chambers R, , R overcomes the compression spring I3, and the piston I2 to the slide valve 27 start moving rightward in the drawing (FIG. 2).

In this state, when the movement of the piston 12 to the slide valve 27 is completed, the slide valve connects the through hole 11a to the suction pipe 6 with the through hole 11b to the conduit pipe 7 of the outdoor heat exchanger 9.
The refrigerant is passed through the compressor 4 → reversing valve body 1 → indoor heat exchanger 10 → throttle 29 → outdoor heat exchanger 9 → reversing valve body 1 →
(Figure 3) Effects of the Invention As described above, the present invention divides the inside of the cylindrical reversing valve body into a high pressure chamber and a pressure conversion chamber by a piston. The high pressure chamber is provided with a connection port for the discharge pipe of the compressor, a connection port for the suction pipe of the compressor, and a connection port for two heat exchanger conduits sandwiching the connection port.
A series of switching valve seats are provided over the connection ports for the heat exchanger conduits, a slide valve that is in sliding contact with the switching valve seats is connected to the piston, and a spring is provided for biasing the piston toward the high pressure chamber; Since the pressure conversion chamber is configured to selectively communicate with the high pressure side and the low pressure side via the pilot solenoid valve, the switching operation can be stabilized while simplifying the structure of the four-way reversing valve. .

[Brief explanation of the drawing]

Figures 1 (a) and (b) are a sectional view (a) showing the cooling operation state of an embodiment of the present invention and a sectional view (b) of the pilot solenoid valve, and Figures 2 (a) and (b) are Figure 3 (a) and (b) are cross-sectional views of the pilot solenoid valve when switching from cooling operation to heating operation (a) and cross-sectional views of the pilot solenoid valve. (b). DESCRIPTION OF SYMBOLS 1... Reversing valve main body, 4... Compressor, 5... Discharge pipe, 6... Suction pipe, 7, 8... Heat exchanger conduit, 9,
10... Heat exchanger, 11... Valve seat for switching, 1
2...Piston, R1...High pressure chamber, R2...Pressure conversion chamber, 13...Compression spring, 15...Pilot T
i 611 valve. ■ (B) (B) 2nd day) Figure taken (B) Figure procedure amendment (voluntary) November 24, 1999 Director General of the Patent Office Yoshi 1) Moon Yi 1, 1 ■ Cow's Roar 063 Patent Application No. 210624 2, Name of the invention: Four-way valve for reversible refrigeration cycle 3, Relationship to the amended case Patent applicant address: 2-55-5 Wakamiya, Nakano-ku, Tokyo Name: Saginomiya Seisakusho Co., Ltd. 4, Agent Number of inventions increased by 6° amendment (a) (b) (b) Ge) Figure 2

Claims (1)

[Claims] The cylindrical 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 the discharge pipe of the compressor, a connection port for the suction pipe of the compressor, and two ports sandwiching the connection port. and a connection port for the heat exchanger conduit,
A series of switching valve seats is provided from the connection port for the suction pipe to the connection port for the two heat exchanger conduits, and a slide valve in sliding contact with the switching valve seat is connected to the piston, and the piston is directed toward the high pressure chamber. A biasing spring is provided,
A four-way valve for a reversible refrigeration cycle, characterized in that a pressure conversion chamber is selectively communicated with a high pressure side and a low pressure side via a pilot solenoid valve.