JPS6078174A - Four-way selector valve - Google Patents

Abstract

PURPOSE:To perform a stable operation without producing an intermediate stop phenomenon, by forming a low pressure fluid passage in a slide valve, interconnecting it in sliding on a body inner wall, in a deviated position toward its movement. CONSTITUTION:A low pressure fluid passage 3'a interconnected to either of a low pressure fluid outlet pipe 7 or a select passage pipe 8 or 9 is formed in a slide valve 3'. This low pressure fluid passage 3'a is formed in an unbalanced position in a moving direction, namely, a deviated position in a longitudinal direction. Therefore, pressure balance at both sides of the slide valve 3' due to a bypass phenomenon is in no case produced whereby it comes into a state of being unbalanced by dint of dynamic pressure in a fluid. As a result, an intermediate stop phenomenon is thoretically preventable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a four-way switching valve, and particularly to a four-way switching valve suitable for use in piping of a reversible refrigeration cycle such as an air conditioner.

[Background of the invention]

Four-way switching valves are used in the piping that makes up the reversible refrigeration cycle of heat pump air conditioners for cooling and heating.
This valve is used to switch the flow of refrigerant depending on the purpose of cooling or heating.

First, let's look at Figures 1 and 2 for general four-way switching valves.
This will be explained with reference to the figures.

FIG. 1 is a sectional view of a general four-way switching valve, and FIG. 2 is a sectional view taken along the line A-A in FIG.

In the figure, 1 is a body, which is a cylindrical container whose both ends are closed with a lid 1a having a fluid passage (not shown). A high-pressure fluid inlet pipe 6 for a high-pressure fluid inlet passage is provided that opens on the inner wall surface of the central portion of the body 1, and 5 is a rotation stopper. A low pressure fluid outlet pipe 7 relating to a low pressure fluid outlet passage is provided on the opposite side. Reference numeral 8.9 denotes switching passage pipes related to the switching passage, which are provided on both sides of the low pressure fluid outlet pipe 7. 3 is a sliding valve, and the sliding valve 3 is in contact with the inner wall of the body 1 with a semicircular arc-shaped outer periphery, and the low-pressure fluid outlet pipe 7 and the switching passage pipe are connected to the surface facing the low-pressure fluid outlet pipe 7. 8
, 9, that is, a low pressure fluid passage 3a is formed.

Reference numeral 2 denotes a connecting member, which is provided with seals 4 at both ends, holds the sliding valve 3 together, and is moved by fluid pressure from both ends of the body 10, although detailed illustrations and explanations are not provided.

In the four-way switching valve configured as described above, when the low pressure fluid outlet pipe 7 and the switching passage pipe 9 are now communicated via the low pressure fluid passage 3a, the other switching passage pipe 8 becomes an outlet passage for high pressure fluid. That is, high-pressure refrigerant gas or the like flows from the high-pressure fluid inlet pipe 6 through the fluid passage 2a to the switching passage pipe 8, and low-pressure refrigerant or the like flows from the switching passage pipe 9 to the low-pressure fluid passage 3.
a to a low-pressure fluid outlet pipe 7.

The operation and problems of fluid passage switching in a conventional four-way switching valve constructed as described above will be explained with reference to FIG. 4.

FIG. 4 is an operational diagram of a sliding valve of a conventional four-way switching valve.

In the figure, the rectangular portion indicates the above-mentioned slide valve 3, and the elongated section shown in the center of the rectangle indicates the above-mentioned low-pressure fluid passage 3a provided in the slide valve 3.

The slide valve 3 moves as shown in (a) to (e) to switch the fluid passage.

In the embodiment (a), the above-described low pressure fluid outlet pipe 7 and the switching passage pipe 9 communicate with each other via the low pressure fluid passage 3a, and the switching passage pipe 8
This shows the state in which the pipe serves as an outlet pipe for high-pressure fluid.

The mode (e) is a state in which the fluid passages are switched, the low pressure fluid outlet pipe 7 and the switching passage pipe 8 communicate with each other via the low pressure fluid passage 3a, and the switching passage pipe 9 becomes an outlet pipe for high pressure fluid. It shows.

When the slide valve moves to the position (C) (hereinafter referred to as the intermediate position), the high-pressure fluid passes through the hatched passage and bypasses into the low-pressure fluid passage. At this time, the high and low pressures are momentarily balanced, so the balance of the VC sliding valve 3 is maintained, resulting in a phenomenon in which the valve stops at this intermediate position. When this phenomenon of intermediate stoppage of the four-way valve occurs, the flow path switching of the refrigeration cycle is not performed, resulting in poor performance and a very serious problem such as burnout of the compressor.

[Purpose of the invention]

The present invention was made in order to solve the problems of the prior art, and it is possible to stabilize the fluid path without causing an intermediate stop phenomenon by hitting the fluid passage switching trap of a four-way switching valve adopted in piping that constitutes a reversible refrigeration cycle. The purpose of this invention is to provide a highly reliable four-way switching valve that performs the following operations.

[Summary of the invention]

The four-way switching valve according to the present invention has a body including a high-pressure fluid inlet passage, a low-pressure fluid outlet passage, and two switching passages that are opened on an inner wall surface, and one of the low-pressure fluid outlet passages and one of the switching passages. A four-way switching valve comprising a slide valve equipped with a low-pressure fluid passage that slides and communicates with the inner wall of the body, and a connecting member that holds the slide valve integrally and moves within the body, When switching the switching passage as the valve slides, the direction of movement of the low pressure fluid passage provided in the sliding valve is adjusted so that the flows of high and low pressure fluids in the sliding valve are not balanced on the left and right sides of the sliding valve. It is formed at a position shifted from the position shown in FIG.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained in accordance with the above-mentioned figures 1 and 2.
This will be explained with reference to FIGS. 3 and 5.

FIG. 3 is a perspective view of a slide valve of a four-way switching valve according to an embodiment of the present invention, and FIG. 5 is an operational view of the slide valve. In the figures, the same reference numerals as in FIGS. 1.2.4 indicate parts equivalent to those of the prior art.

In FIG. 3, the sliding valve 3' has a space communicating with either the low pressure fluid outlet pipe 7 or the switching passage pipe 8.9 shown in FIGS. 1 and 2, that is, a low pressure fluid passage 3'a is formed. has been done. The low-pressure fluid passage 3/a is located at an unbalanced position in the direction of movement of the working valve, that is, at a position offset in the longitudinal direction;
In this example, if the dimensions of the lands that slide against the inner wall of the fuselage 1 are 11 and 12, then #+>j? z.

The fluid passage switching function of a four-way switching valve incorporating such a sliding valve element is explained with reference to FIG. 5. In FIG. 5, 3' is a sliding valve, 3'a is a low pressure fluid passage, jl'1,1
The dimensions of the two-legged land are shown, and the sliding valve 3' is (a
') to (e') to switch the fluid passage.

At the position (a'), the slide valve 3' communicates the low-pressure fluid outlet pipe 7 with one switching passage pipe 9, and the other switching passage pipe 8 serves as an outlet for high-pressure fluid. When the four-way switching valve operates, the slide valve moves from position (a') to position (e'), and the two switching passages, high-pressure fluid outlet and low-pressure fluid inlet, are switched, thereby switching the fluid flow path. Change. At this intermediate position (e') during operation, the bypass from the high-pressure side to the low-pressure side occurs from the diagonally shaded passage, but the bypass passage is only on one side of the slide valve 3', and the slide valve due to the bypass phenomenon There is no pressure balance between the left and right sides, and a cyan balance state occurs due to the dynamic pressure of the fluid. Therefore, in principle, the intermediate stop phenomenon can be prevented.

As described above, according to this embodiment, it is possible to prevent the intermediate stop phenomenon of the four-way switching valve, and to provide a highly reliable four-way switching valve.

In particular, this example has no drawbacks in terms of cost or manufacturing, and is extremely practical.

Note that the present invention is not limited to the four-way switching valve having the structure shown in FIGS. 1 and 2, but is general-purpose within the range of four-way switching valves that can be expected to have similar effects.

〔Effect of the invention〕

As described above, according to the present invention, when switching the fluid passage of a four-way switching valve adopted in piping constituting a reversible refrigeration cycle, it is possible to achieve reliable operation with no intermediate stoppage phenomenon and stable operation. It is possible to provide a high-performance four-way switching valve.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a general four-way switching valve, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a sliding view of a four-way switching valve according to an embodiment of the present invention. FIG. 4 is a perspective view of a valve train, FIG. 4 is an operational diagram of a sliding valve of a conventional four-way switching valve, and FIG. 5 is an operational diagram of a sliding valve of a four-way switching valve according to an embodiment of the present invention. 1...Body 2...Connecting member 3'...Sliding valve 3
'a...Low pressure fluid passage 6...High pressure fluid inlet pipe 7.
...Low pressure fluid outlet pipe 8,9...Switching passage tube 3 box 3'

Claims (1)

[Claims] 1. A body provided with a high-pressure fluid inlet passage, a low-pressure fluid outlet passage, and two switching passages opened on an inner wall surface, and the low-pressure fluid outlet passage and one of the switching passages being slid on the inner wall of the body. In a four-way switching valve comprising a sliding valve having a low-pressure fluid passage that communicates with each other, and a connecting member that holds the sliding valve integrally and moves within the body, the switching passage that accompanies the sliding movement of the sliding valve. When switching, the low pressure fluid passage provided in the slide valve is formed at a position shifted in the direction of movement so that the flows of high and low pressure fluids in the slide valve are not balanced on the left and right sides of the slide valve. A four-way switching valve characterized by: