JPS6318062B2 - - Google Patents

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, 1 are partitioned by the seal attachment part 3 of the body 1.
In b, the pressure is adjusted from the fluid passages 5a and 5b by the action of a separately provided control valve (not shown), and the sliding body in which the sliding valve 2, seal mounting part 3, and connecting rod 4 are integrated is located on the left side. Alternatively, it moves to the right and switches the high-pressure, high-temperature gas flowing in from the high-pressure pipe 6 to the conduit pipe 8 or the conduit pipe 9 to form a path for outflow. At the same time, the high-pressure gas flowing out from the conduit pipe passes through the heat exchanger of the refrigeration cycle, returns as low-pressure low-temperature gas, and flows out from the low-pressure pipe 7 along the inner wall surface 10 of the slide valve 2. ing. 11 is a conduction hole, 1
2 is a valve seat.

In this manner, the slide valve 2 and the seal mounting 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. Therefore, under severe conditions of inflowing high-pressure, high-temperature gas (sometimes liquid may be mixed in), the sliding valve, seal mounting portion, and connecting rod may be deformed by heat and pressure, causing malfunction. In addition, in the conventional valve 3-1-12, the valve 3-1-12 is first fixed in the body 1, and the conduit pipe 8 or 9 is connected to the connection hole of the seat 12 from outside the body. 3 is assembled after the connecting rod 4 assembled integrally with the sliding valve 2 is inserted into the body 1, which makes the assembly work difficult.

As related to these,
150660 etc.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a four-way switching valve that does not undergo deformation due to high gas pressure or heat, can provide reliable sealing, and has a connecting member that can be easily assembled.

[Summary of the invention]

In order to achieve the above object, the present invention includes a cylindrical body whose both ends are closed with a lid having a fluid passage, a high-pressure fluid inlet passage opened on the inner wall surface of the body, and a low-pressure fluid outlet passage, and two switching channels. a passage, a slide valve that slides and communicates with the low-pressure fluid outlet passage and one switching passage within the body; seal mounting portions are formed at both ends and the slide valve is held and slid together; In the four-way switching valve having a movable connecting member, the connecting member is an integrally molded connecting member including a seal mounting portion, and is prevented from rotating by a rotation preventing means provided on the body. A sliding valve, which is separate from the connecting member and has a semi-circular sliding surface, is fitted into the recess provided in the center of the connecting member so as to receive gas pressure on the back surface, and the sliding valve is inserted into the recess provided in the center of the connecting member to receive high pressure gas pressure or It has a structure that does not deform due to heat and can be reliably sealed, and also has a structure that allows easy installation of the connecting member.

[Embodiments of the invention]

The present invention will be explained below with reference to an embodiment shown in FIGS. 3 and 4.

FIGS. 3 and 4 show cross-sectional views of the four-way valve structure of the present invention, where 21 is a cylindrical body, 22 is a semi-circular cross-section and forms a recess that serves as a fluid passage, and the connecting member is It is molded from another material, such as synthetic resin. Reference numeral 23 designates an integrally molded connecting member having seal attachment portions 24, 24' at both ends. The slide valve 22 is loosely fitted into a recess provided in the center of the connecting member 23. Both ends of the body 21 are sealed by a lid 26 with fluid passages 25, 25'. A high-pressure fluid inlet pipe 27, a low-pressure fluid outlet pipe 28, and two switching passage pipes 29, 29' are attached to the side surface of the body 21. fluid passage 25,
25' has a separate drive device (not shown)
As a result, the high-pressure fluid alternately flows into one side and the other side conducts to the low-pressure side, so that the connecting member 23 holding the sliding valve 22 moves while keeping the sliding valve 22 in close contact with the inner wall of the fuselage, and high-pressure fluid flows into the other side. Switch the passage.

The force that brings the sliding valve 22 into close contact with the inner wall of the body is caused by the pressure of the high-pressure gas that has flowed into the body 21 acting on the back surface of the sliding valve 22 at the step between the connecting member 23 and the sliding valve 22 as shown in FIG. This occurs when high-pressure gas eventually flows into the gap between the two. Furthermore, when the connecting member 23 moves, as shown in FIG.
A rotation prevention means 30 is inserted into a groove 23a provided in the moving direction of the rotation prevention means 30. The rotation prevention means 30
After the connecting member 23 is assembled into the body, it is inserted from the upper opening of the high-pressure fluid inlet pipe 27, and is fixed by brazing the conductive pipe 31 at an appropriate position. The above-mentioned connecting member 23 is assembled into the body 21 in that the sliding part is not a flat surface and a circular part of the seal attachment part as in the conventional case, but is entirely circular and is formed concentrically with the circular diameter of the body 21. It is very easy to insert. Moreover, since the rotation prevention means is not pressed directly against the connecting member but slides on the side surface, wear and damage to the connecting member can be prevented and smooth sliding can be achieved. The rotation prevention means 30 has a cylindrical shape so that fluid flow is not obstructed. As shown in FIG. 4, 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 cylindrical tube formed as shown in FIG. 5. By using the body shown in FIG. 5, the mounting holes are simply drilled, and deformation of the sliding surface can be more reliably 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.

[Brief explanation of the drawing]

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. 1, Fig. 3 is a sectional view showing the structure of the four-way switching valve main body of the present invention, and Fig. 4 is a sectional view of a conventional four-way switching valve. 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 attachment part, 25...Fluid passage, 26...
Lid, 27...High pressure fluid inlet pipe, 28...Low pressure fluid outlet pipe, 29...Switching passage pipe, 30...Rotation prevention means, 3
1... Conduction pipe.

Claims (1)

[Claims] 1. A cylindrical body whose both ends are sealed with a lid having a fluid passage, a high-pressure fluid inlet 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 four-way switching valve comprising a slide valve that slides and communicates with the switching passage within the body, and a connecting member that has seal mounting portions formed at both ends and that holds the slide valve and slides integrally with the slide valve. , the connecting member is an integrally molded connecting member including a seal attachment portion, and is prevented from rotating by a rotation prevention means provided on the body, and a recess provided in the center of the connecting member. A four-way switching valve characterized in that a sliding valve having a semi-circular sliding surface, which is separate from the connecting member, is fitted into the back surface so as to receive gas pressure.