JPS61112871A - 4-way reverse rotating valve for reversible freezing cycle - Google Patents

Abstract

PURPOSE:To stabilize operation and perform fine control by sectioning the inside of a reverse rotating valve body into two chambers of a high pressure chamber and a pressure converting chamber by a piston and opening or closing the pressure converting chamber by a switch valve. CONSTITUTION:The inside of a cylindrical reverse rotating valve body 1 is sectioned into a high pressure chamber R1 and a pressure converting chamber R2 by a single piston 12. A slide valve 21 sliding to contact to a change-over valve seat 11 is connected to the piston 12 to form a uniform pressure hole 12a communicating always the high pressure chamber and the pressure converting chamber on the piston. A pressure relief hole 3a communicating to suction side of a compressor 4 is provided on the pressure converting chamber R2 and a switch valve 16 is provided on the relief hole, and the diameter of the pressure relief hole 3a is made larger than that of the uniform pressure hole 12a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a four-way reversing valve used for switching between cooling and heating in a dual-purpose air conditioner.

Conventional technology A conventional differential pressure-driven four-way reversing valve has three chambers: a high pressure chamber, a low pressure chamber, and a pressure conversion chamber, or a high pressure chamber and two pressure conversion chambers, using a pair of pistons or the like within the cylindrical reversing valve body. In most cases, 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.

Problems to be Solved In the above 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 downsizing 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 chambers, 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.

[Structure of the invention]

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 single piston, and a compressor discharge is connected to the high pressure chamber. A connection port for the pipe, 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. A series of switching valve seats are provided over the opening, a slide valve that slides on the switching valve seats is connected to the piston, a pressure equalizing hole is formed in the piston to constantly communicate the high pressure chamber and the pressure conversion chamber, and the piston is provided with a series of switching valve seats. A spring is provided to bias the pressure 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, an on-off valve is provided in the pressure relief hole, and the diameter of the pressure relief hole is adjusted to equalize the pressure. We adopted a configuration in which the hole is made larger than the diameter of the hole.

EXAMPLE An example 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 welded and fixed to both ends. A discharge pipe 5 of a compressor 4 is connected to the stopper body 2, and two conduits 7, 1, 2 and 3 are provided in the reversing valve body, sandwiching a suction pipe 6 of the compressor 4 in the axial direction.
8 are connected. 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, 1 of a switching valve seat 11 fixed in the reversing valve body 1.
．． 1b, 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 R1 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 toward the high pressure chamber R1. The piston 12 is formed with a pressure equalization hole 12a that constantly communicates the high pressure chamber R3 and the pressure conversion chamber R2, and the plug body 3 is formed with the pressure equalization hole 12a.
A pressure relief hole 3a having a larger diameter than the pressure relief hole 3a is formed, and a conduit I4 leading to the suction pipe 6 is connected to the pressure relief hole 3a.

An electromagnetic on-off valve 16 is attached to the plug body 3 via a plunger pipe 15, and a needle valve body 18 provided at the tip of the plunger 17 approaches and separates from a valve seat 3b provided in the middle of the pressure relief hole 3a to relieve the pressure. The hole 3a is opened and closed. Plunger 17
A compression spring 20 is provided between the needle valve body 18 and the suction core 19, and urges the needle valve body 18 in the direction of contacting the valve seat 3b.

On the valve seat 11, a slide 'luf' 21 having a communication lumen 21a is provided;
is connected to the piston 12 by a connecting rod 22. The slide valve 21 is moved 12 through its bore 21a to have a through hole 11a for the suction pipe 6 in the valve seat 11 and on both sides a through hole 11b for the heat exchanger conduit 7.8, II.
It communicates with C selectively.

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 needle valve body 18 closes the pressure relief hole 3a, so the high pressure chamber R8 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. The slide pulp 21 is pushed until it makes contact with the through hole 11a and the through hole 11c, so that the refrigerant flows through the compressor 4, the discharge pipe 5, and the conduit 7.
- Outdoor heat exchanger 9 - Throttling means 23 - Indoor heat exchanger 10 -
It circulates along the route of 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 attracted, the needle 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.

As a result, in the pressure conversion chamber R2, the refrigerant escapes from the pressure relief hole 3a to the suction side, and at the same time, the refrigerant is supplied from the high pressure chamber R through the pressure equalization hole 12a, and at this time, the diameter of the pressure relief hole 3a is equalized. Since the diameter of the pressure hole 12a is larger and the amount of refrigerant discharged is larger than the amount of refrigerant supplied, the pressure conversion chamber R2 becomes low pressure, and a pressure difference that overcomes the elasticity of the compression spring 13 is generated between the chambers R and R2. As shown in FIG. 2, the piston 12 to the slide valve 21 move in the direction of the stopper 3. The slide valve 21 is connected to the through hole Lla through the through hole 11.
b, so the refrigerant flows between the compressor 4 and the discharge pipe 5.
- Conduit 8 - Indoor heat exchanger 10 - Throttle means 23 - Outdoor heat exchanger 9 - Conduit 7 - Suction pipe 6 - Compressor 4 and circulates through the path to perform heating operation.

After a certain period of time after the switching movement of the piston 12 to the valve body 21, the differential pressure normally reaches 2 kg/CI+! The electromagnetic on-off valve 16 is brought into a non-energized state at the point in time when it exceeds the front and back.

In this state, the slide valve 21 is pressed and fixed to the valve seat 11 due to the differential pressure between the low pressure inside the communication lumen 21a of the slide valve 21 and the high pressure outside the slide valve 21, and the elasticity of the compression spring 13 Win and hold the position.

When the compressor 4 is stopped by the thermostat, the electromagnetic on-off valve 16 is energized to open the pressure relief hole 3a to forcibly equalize the pressure, shorten the pressure equalization time, and switch to the cooling state by the elasticity of the compression spring 13. After quickly switching to the cooling state during the heating operation in this way, the defrosting operation is performed in response to the defrosting start signal.

〔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 connection ports for the two heat exchanger conduits are provided between the connection ports, and a series of switching valve seats is provided from the connection port for the suction pipe to the connection ports for the two heat exchanger conduits, and A slide valve plate that slides on the switching valve seat is connected to an 8-piston, a pressure equalizing hole is formed in the 8-piston to constantly communicate the high pressure chamber and the pressure conversion chamber, and a spring biases the piston toward the high pressure chamber. established,
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 diameter of the pressure relief hole is formed to be larger than the diameter of the pressure equalization hole. Therefore, the structure can be greatly simplified, the operation can be stabilized, and the device can be downsized, and it has the advantage of being able to perform fine control using an electronic system.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a diagram showing the same operating state. 1... Reversing valve body, R1... High pressure chamber,
R2...Pressure conversion chamber, 3a...Pressure relief hole, 4...Compressor, 5...Discharge pipe,
6... Suction pipe, 7, 8... Heat exchanger conduit, 11... Switching valve seat, 12...
... Piston, 12a... Pressure equalization hole, 13...
...Spring, 16...Opening/closing valve, 21...
・Slide valve. Procedural amendment (voluntary) December 7, 1980 Manabu Shiga, Commissioner of the Patent Office1, Myogyu indication Patent Application No. 232932 of 19822, Title of invention Four-way reversing valve for reversible refrigeration cycle 3, Amendment Dealing with the cattle who do this Patent applicant address: 2-55-5 Wakamiya, Nakano-ku, Tokyo Name: Saginomiya Seisakusho Co., Ltd. 4 Contents of amendment by agent (Japanese Patent Application No. 59-232932) Specification No. 6
In the third line of the page, the phrase "by movement 12" is corrected to "by movement."

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 the connection port is sandwiched between the high pressure chamber and the compressor discharge pipe. and a connection port for the two heat exchanger conduits, and a series of switching valve seats 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 constantly communicate the high pressure chamber and the pressure conversion chamber, and a spring is provided to bias the piston 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 the diameter of the pressure relief hole is formed to be larger than the diameter of the pressure equalization hole. A four-way reversing valve for reversible refrigeration cycles.