JPS61218883A - Four way type reversing valve for reversible refrigerating cycle - Google Patents

Abstract

PURPOSE:To produce a four way type reversing valve for reversible refrigerating cycle which has stabilized function and miniaturized dimensions by opening a pressure equalizing hole by means of a driving pin working in accordance with the motion of a plunger when a pressure relief hole has been closed. CONSTITUTION:When an electric current is sent to an electromagnetic closing valve 16, and a compressor 4 is actuated, a plunger 17 is attracted to cause a ball valve 18 to open a pressure relief valve hole 3a, and a pressure transducing chamber R2 therefore communicates with the lower pressure inlet side of the compressor 4. In this case, since a ball valve 12c comes into strong contact with a valve seat 12b to close a pressure equalizing hole 12a, differential pressure to overcome the elastic force of a compression spring 13 occurs between chambers R1, R2 to move a piston 12 or a slide valve 21 toward a plug body 3. A through hole 11a is connected with a through hole 11b through the slide valve 21. Since even low differential pressure can establish the transduced position of the piston or slide valve, this valve is suitable for a four way type valve for the defrosting circuit of hot gas bypass system.

Description

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

Conventional differential pressure-driven four-way reversing valves have a cylindrical reversing valve body that uses a pair of pistons to create a high-pressure chamber, a low-pressure chamber, and a pressure conversion chamber, or a high-pressure chamber and two pressure conversion chambers. In most cases, the pressure converting chamber is divided into chambers, and the pressure conversion chamber is switched by a pilot three-way solenoid valve or the like to move a piston or a valve body for switching a flow path connected to the piston.

In the above-mentioned conventional technology, both the reversing four-way valve and the pilot solenoid valve have complex structures and a large number of mutually communicating conduits, which is a bottleneck in miniaturizing the pilot solenoid valve. Since the control by operation involves passive pressure reduction and active pressurization of the pressure conversion chamber, it has disadvantages such as not being suitable for fine electronic control.

The present invention focuses on the above points, and divides the inside of the reversing valve body into two parts, a high pressure chamber and a pressure conversion chamber, by a piston, and opens and closes the pressure conversion chamber by an on-off valve to operate the piston or the flow path switching valve. By adopting a moving configuration, the structure can be simplified and downsized, and the on-off valve can be used to control the pressure conversion chamber by opening and closing the refrigerant flow in a fixed direction from the pressure conversion chamber to the suction side of the compressor. This allows for fine electronic control through operation.

. In order to achieve the above-mentioned object of controlling the air pressure, the present invention divides the inside of the cylindrical reversing valve body into a high pressure chamber and a pressure converting chamber by a single piston, and the high pressure chamber is connected to the discharge pipe of the compressor. A connection port, a connection port for the suction pipe of the compressor, and a connection port for two heat exchanger conduits across the connection port, and from the connection port for the suction pipe to the connection port for the two heat exchanger conduits. A series of switching valve seats is provided, a slide valve that is in sliding contact with the switching valve seat is connected to the piston, and a pressure equalizing hole is formed in the piston to communicate the high pressure chamber and the pressure conversion chamber, and the pressure equalizing hole is connected to the piston. A valve body that opens and closes is provided, a spring is provided that urges the piston toward the high pressure chamber, a pressure relief hole is provided in the pressure conversion chamber that communicates with the suction side of the compressor, and an on-off valve is provided in the pressure relief hole, and the heating In the operating state, the pressure relief hole is opened by the on-off valve, and the pressure equalization hole is closed by the valve body, and when the pressure relief hole is closed by the on-off valve from this state, the drive pin based on the action during plunging A configuration was adopted in which the pressure equalizing hole was opened by driving the valve body.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 denotes a cylindrical reversing valve body, and plugs 2 and 3 are soldered and fixed to both ends of the valve body. A discharge pipe 5 of a compressor 4 is connected to the plug body 2, and two conduits 7 are connected to the reversing valve body l with a suction pipe 6 of the compressor 4 in between in the axial direction.
, 8 are concatenated. The conduits 7, 8 are connected to two heat exchangers 9, 10 which are used reciprocally as condensers or evaporators. The inner ends of the suction pipe 6 and the conduits 7, 8 are connected to three through holes 11a of a switching valve seat 11 fixed in the reversing valve main body l;
llb and llc, and a series of smooth surfaces lid are formed inside the valve seat 11.

Inside the reversing valve body 1, a piston 12 is slidably provided between the valve seat 11 and the stopper 3,
The interior is divided into a high pressure chamber R3 and a pressure conversion chamber R2. A compression spring 13 is provided between the piston 12 and the stopper 3, and the piston 12 is always biased in the high pressure chamber R+ direction. A pressure equalizing hole 12a is formed in the piston 12 to communicate the high pressure chamber R3 and the pressure conversion chamber R2, and a ball valve 12c is provided which approaches and separates from a valve seat 12b on the high pressure chamber R side of the pressure equalizing hole 12a.

A pressure relief hole 3a is formed in the plug body 3, and a conduit 14 leading to the suction pipe 6 is connected to the pressure relief hole 3a.

An electromagnetic on-off valve 16 is attached to the stopper 3 via a plunger pipe 15, and a ball valve 1 is provided at the tip of the plunger 17.
8 approaches and separates from a valve seat 3b provided in the middle of the pressure relief hole 3a to open and close the pressure relief hole 3a. A compression spring 20 is provided between the plunger 17 and the suction core 19, and the ball valve 1
8 is biased in the direction of contacting the valve seat 3b.

The pressure relief hole 3a passes from the pressure conversion chamber R2 side through the through hole 3a+ on the outer peripheral side of the plug body 3, and connects to the electromagnetic on-off valve 16 in the plug body 3.
It reaches the side valve chamber 30, and communicates with the aforementioned conduit 14 from the valve seat 3b, through the central through hole 3a of the plug body 3, and from the radial through hole 3a.

In the plug body 3, a slider 24 is provided to be slidable in the axial direction on the guide pipe portion 3d on the side of the pressure conversion chamber R2, and a through hole 24a is formed in the slider 24, and a piston 12 is formed in the center of the slider 24. The ball valve 12 enters the pressure equalization hole 12a.
A driving pin 25 is provided to forcibly open the valve c.

A connecting pin 26 is slidably provided on the stopper 3 in the axial direction, and the connecting pin 26 transmits the operation of the plunger 17 to the slider 24 when the plunger 17 is not energized.

A slide valve 21 having a communication bore 21a is provided on the valve seat 11, and the slide valve 21 is connected to the piston 12 by a connecting rod 22. The slide valve 21 moves to the valve seat 11 through its inner cavity 21a.
The through holes 11a for the suction pipes 6 are alternatively communicated on both sides with the through holes 11b, llc for the heat exchanger conduits 7.8.

In the above configuration, FIG. 1 shows the cooling operation state. That is, the electromagnetic on-off valve 16 is in a non-energized state and the plunger 17 is not energized.
is pushed by the spring 20 and the ball valve body 18 closes the pressure relief hole 3a, so the high pressure chamber R9 and the pressure conversion chamber R2 have the same pressure due to the pressure equalization hole 12a, and therefore the piston 12 is pressed against the valve seat 11 by the spring 13. Pushed until they touch,
Since the slide valve 21 allows the through hole 11a to communicate with the through hole 11c, the refrigerant flows through the compressor 4 - discharge pipe 5 - conduit 7 -
It circulates along the route of outdoor heat exchanger 9 - throttling means 23 - indoor heat exchanger l〇 - conduit 8 - suction pipe 6 - compressor 4.

Next, when the electromagnetic on-off valve 16 is energized and the compressor 4 is started, the plunger 17 is sucked, the ball valve body 18 opens the pressure relief hole 3a, and the low pressure on the suction side of the compressor 4 is passed through the pressure conversion chamber R2. communicate with.

At this time, the ball valve 12c comes into contact with the valve seat 12b and closes the pressure equalizing hole 12a, so the compression spring 13
A differential pressure is generated which overcomes the elasticity of the piston 12 and the slide valve 21 move in the direction of the stopper 3 as shown in FIG. Then, since the slide valve 21 allows the through hole 11a to communicate with the through hole 11b, the refrigerant flows through the compressor 4-
Discharge pipe 5 - conduit 8 - indoor heat exchanger 10 - throttle means 23 -
The air circulates through the outdoor heat exchanger 9 - conduit 7 -> suction pipe 6 -> compressor 4, resulting in heating operation.

To convert from heating operation to cooling operation, when the electromagnetic on-off valve 16 is de-energized as shown in FIG.
8 closes the pressure relief hole 3a and drives the slider 24 via the connecting pin 26, whereby the slider 2
The driving pin 25 of No. 4 drives the ball valve 12C of the piston 12 to open the pressure equalizing hole 12a, so the pressure in the chambers R, R1 becomes the same, and the compression spring 13 moves the piston 12 to the slide valve 21 to the position shown in FIG. and enters cooling operation mode.

〔Effect 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 single piston, and the high pressure chamber has a connection port for the discharge pipe of the compressor and a connection port for the suction pipe of the compressor. A connection port and a connection port for two heat exchanger conduits are provided across the connection port, 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 that slides in contact with the switching valve seat is connected to the piston, a pressure equalizing hole is formed in the piston to communicate the high pressure chamber and the pressure conversion chamber, and a valve body is provided to open and close the pressure equalizing hole, and the piston is connected to the slide valve. A spring biased toward the high pressure chamber is provided, a pressure relief hole communicating with the suction side of the compressor is provided in the pressure conversion chamber, and an on-off valve is provided in the pressure relief hole, and the on-off valve releases the pressure during heating operation. While the hole is opened, the pressure equalization hole is closed by the valve body, and when the pressure relief hole is closed by the on-off valve from this state, the valve body is driven by the drive pin based on the operation of the plunger to close the pressure equalization hole. Because it is made in such a way that it opens,
The structure can be greatly simplified to stabilize the operation and achieve miniaturization, and the electronic system allows fine control, and in particular, the conversion position of the piston or slide valve can be determined even with low differential pressure. It is suitable as a four-way valve for a hot gas bypass type defrost circuit.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an embodiment of the present invention in a cooling operation state, Fig. 2 is a cross-sectional view of the same heating operation state as above, and Fig. 3 is a cross-sectional view of essential parts when switching from heating operation to cooling operation. It is. DESCRIPTION OF SYMBOLS 1...Reversing valve body, R,...High pressure chamber, R2...Pressure variable wheel, 11...Switching valve seat, 12...Piston, 12a...Pressure equalization hole, 12c...・Valve body, 13・
...Compression spring, 3a...Pressure relief hole, 16...Opening/closing valve, 17...Plunger, 25...Drive pin.

Claims (1)

[Claims] The cylindrical reversing valve body is divided into a high pressure chamber and a pressure conversion chamber by a single piston, and the high pressure chamber has a connection port for the compressor's discharge pipe, a connection port for the compressor's suction pipe, and a connection port between the two. and a series of switching valve seats extending from the connection port for the suction pipe to the connection port for the two heat exchanger conduits,
A slide valve that slides in contact with the switching valve seat is connected to the piston, a pressure equalizing hole is formed in the piston to communicate the high pressure chamber and the pressure conversion chamber, and a valve body is provided for opening and closing the pressure equalizing hole. A spring is provided to bias the material toward the high pressure chamber.
A pressure relief hole communicating with the suction side of the compressor is provided in the pressure conversion chamber, and an on-off valve is provided in the pressure relief hole, and in the heating operation state, the on-off valve opens the pressure relief hole, and the valve body equalizes the pressure. For a reversible refrigeration cycle, the hole is closed, and when the pressure relief hole is closed by the on-off valve from this state, the valve body is driven by a drive pin based on the operation of a plunger to open the pressure equalization hole. Four-way reversing valve.