JPS59103080A - Four-way switching valve - Google Patents

Abstract

PURPOSE:To prevent the titled valve from deforming due to high pressure gas or heat, by a method wherein the titled valve is made slidable unitrarily by forming seal parts on body ends and making a sliding valve hold and a connecting component provided with a groove in which a preventive device for turning is inserted is provided. CONSTITUTION:Both ends of a body 21 is sealed up tightly by a lid 26 provided with fluid ducts 25, 25'. An inlet tube 27 for a high pressure fluid, an outlet tube 28 for low pressure fluid and two directional control duct tubes 29, 29' are mounted on a body side face of the body 21. A connecting component 23 moves while making a sliding valve 22 addhere closely to an inner wall of the body through a fluid to be introduced into the fluid ducts 25, 25'. A prevention device 30 for turning is inserted into a groove 23a provided in a moving direction of the connecting component 23 so as not to shift a fluid duct position by the turning of the slide valve 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a four-way switching valve used in a reversible refrigeration cycle of an air conditioner or the like.

[Prior art]

FIG. 1 shows a conventional four-way switching valve structure. In this figure, the sliding body inside the valve body is in the center position, but the left and right end chambers 1a and lb, which are partitioned by the seal part 3 of the body 1, are opened by a fluid passage 5a by the action of a separately provided control valve (not shown). , the pressure is adjusted from 5b, and the sliding body in which the sliding valve 2, seal part 3, and connecting rod 4 are integrated is located on the left -! , or to the right, and directs the high-pressure, high-temperature gas flowing through the high-pressure pipe 6 to the conduit pipe 8 or the conduit pipe 9.
to form a passageway for outflow. At the same time, the high-pressure gas flowing out of the conduction pipe passes through the heat exchanger of the refrigeration cycle, returns as low-pressure low-temperature gas, and flows out through the low-pressure pipe 7 along the inner wall surface 10 of the slide valve 2. It becomes. 11 is a conduction hole, and 12 is a valve seat.

In this manner, the slide valve 2 and the seal portion 3 are made of synthetic resin or the like that has low frictional resistance and is easy to maintain airtightness in order to be able to operate under the pressure of high-pressure gas.

Generally, in a refrigeration cycle in which a four-way switching valve is used, the range of temperature conditions used is wide, and the state of the refrigerant (changes between gas and liquid) at the time of starting and stopping is also not constant. For this reason, if the inflowing high-pressure, high-temperature gas (sometimes liquid may be mixed in) is subjected to severe conditions, the sliding valve, seal portion, and connecting rod may be deformed by heat and pressure, causing malfunction. Further, in the conventional valve seat 12, the valve seat 12 is provided inside the body 1, and the valve seat 12 is provided inside the body 1.
Since the seat part 3 is constructed so that the conduit pipes 8'' and 9 can be switched and connected to the seat part 2, the connecting rod 4 is inserted into the body 1 and temporarily assembled, which makes assembly work difficult.

[Purpose of the invention]

The present invention has been made in view of the above points, and a first object of the present invention is to provide a four-way switching valve that is free from deformation due to high pressure gas pressure or heat.

A second object is to provide a four-way switching valve whose connecting member is easy to assemble.

[Summary of the invention]

In order to achieve the above object, the present invention includes a body of an inner cylinder whose both ends are sealed with a lid having a fluid passage, and a high-pressure fluid inlet passage and a low-pressure fluid outlet passage opened on the inner wall surface of the body, and two switching channels. a passage, a sliding valve having a space that allows the low-pressure fluid outlet passage and one switching passage to communicate with each other by sliding on the inner wall surface of the body; and a sealing portion formed at both ends to hold the sliding valve. A connecting member that slides together and has a groove for inserting a rotation prevention means, has a structure that does not deform due to high pressure gas pressure or heat, and has a structure that allows easy assembly of the connecting member. It is.

[Embodiments of the invention]

The present invention will be explained below with reference to an embodiment shown in FIGS. 3 to 5.

FIG. 3 shows the four-way valve structure of the present invention, in which 21 is a cylindrical body, 22 is a sliding valve, and 23 is a connecting member having seals 24 and 24' at both ends. Both ends of the body 21 are connected to the fluid passage 2.
It is sealed by a lid 26 with a diameter of 5.25'. A high-pressure fluid inlet pipe 27, a low-pressure fluid outlet pipe 28, and two switching passage pipes 29 and 29' are attached to the side surface of the body 21.

A connecting member holds the υ sliding valve 22 by alternately allowing high pressure fluid to flow into one side of the fluid passages 25 and 25' and conducting the other side to the low pressure side by a separately provided drive device (not shown). 23 moves while keeping the slide valve 22 in close contact with the inner wall of the body, and switches the passage of high and low pressure fluid.

In this case, as shown in FIG. 2, since the inner wall of the body is cylindrical, a groove 23 is provided in the direction of movement of the connecting member 23 to prevent the sliding valve 22 from rotating and shifting the fluid passage position.
A rotation prevention means 30 is inserted in a. The rotation prevention means 30 is inserted through the upper opening of the high-pressure fluid artificial pipe 27 after the connecting member 23 is assembled into the body, and is fixed by brazing the conductive pipe 31 at an appropriate position. The rotation prevention means 30 has a cylindrical shape so that the flow of fluid is not obstructed. As shown in FIG. 2, the body 21 is generally formed with a rising hole in the passage pipe mounting hole to increase the brazing joint area, but during this molding, the inner cylinder of the body is deformed and the tightness of the sliding valve 22 is affected. If damaged, fluid leaks from the high pressure side to the low pressure side, so there is a method of using a shaped cylindrical tube as shown in FIG. By using the body shown in FIG. 3, the mounting holes are simply drilled, and deformation of the sliding surface can be prevented.

〔Effect of the invention〕

Since the present invention is constructed as described above, there is no deformation due to high pressure gas or heat. Furthermore, the connecting member can be easily assembled. In addition, since the rotation prevention means is not pressed directly against the connecting member but slides on the side, wear and tear of the connecting member can be prevented and smooth sliding can be achieved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional four-way switching valve, FIG. 2 is a view taken in the direction of arrow A in FIG. A partial sectional view showing the internal structure of the fuselage in the center of the figure, and FIG. 5 is an external view of the fuselage material showing another embodiment. 21...Body 22...Sliding valve 23...Connection member 24...Seal portion 25...Fluid passage 26...Lid 27...High pressure fluid inlet pipe 2
8...Low pressure fluid outlet pipe 29...Switching passage pipe
30...Rotation prevention means 31...Condition management agent Patent attorney Usui 1) Effective)

Claims (1)

[Claims] A body of an inner cylinder whose both ends are sealed with a lid having a fluid passage, a high-pressure fluid artificial passage opened on the inner wall surface of the body, a low-pressure fluid outlet passage, two switching passages, and one low-pressure fluid outlet passage. A slide valve having a space for communicating the switching passage by sliding on the inner wall surface of the body, and a rotation prevention means formed with seal portions at both ends, holding the slide valve and sliding together, and inserting a rotation prevention means. A four-way switching valve consisting of a connecting member having a groove.