JPS59117965A - Four-way switching valve - Google Patents

Abstract

PURPOSE:To switch a path in a simple structure by conducting one-side airtight chamber to low pressure side to cause a slider to suck and conducting to high pressure side to balance pressure and returning the slider by a pressure spring force. CONSTITUTION:A high-pressure gas inlet path 2, a low-pressure gas outlet path 3 and two switching paths 4, 5 are connected with one another by a valve body 1. A sliding valve 6 forms a circular-arc contact surface 6a having a suitable width, which is brought into contact with the inner wall surface 1a of the body 1, thereby forming a space 7, so that the low-pressure gas outlet path 3 is connected with either the switching path 4 or 5. A coupling member 8 has a seal portion 9 on one side thereof and a guide hole 11 for a shaft 10 of a turning preventing means on the other end thereof. An airtight chamber 15 having a pressure spring 13 built-in on one of the body is adapted to conduct high-pressure gas through a three-way solenoid 16 to be balanced with high pressure in the body 1. Subsequently, when an electric current is applied to a coil 23 of the three-way solenoid valve 16, a switching valve 20 changes a path as shown by an arrow to conduct the airtight chamber 15 with the low-pressure path 3.

Description

[Detailed description of the invention] [Invention θ') Field of application] The present invention relates to a four-way switching valve used in a nitrogen conditioner or a reversible refrigeration cycle of a refrigerator [Prior art] Conventional four-way switching valve This is a system in which a switching action is performed by connecting one of the airtight chambers at both ends of the body separated by the sealing members of a sliding body having a pair of sealing members to the high-pressure side and the other to the low-pressure side. However, the dimensional accuracy of the inner cylinder of the fuselage needs to be improved in order to ensure airtightness in the seal part.
In addition, the structure of the sealing member is complicated, resulting in high production costs. Furthermore, in order to carry out the above-mentioned switching action, it is necessary to use a special four-way valve as the operating solenoid valve, and the assembly of the conductive pipe is complicated, resulting in high cost and poor reliability.

[Purpose of the invention]

The object of the present invention is to provide a sealing section only on one side, and conduct the airtight chamber on one side to the low pressure side to cause the sliding body to perform a suction operation, or conduct to the high pressure side to balance the pressure.
It is an object of the present invention to provide a four-way switching valve with a simple structure that performs a passage switching action by returning to its original position using a pressing spring force.

[Summary of the invention]

The feature of this four-way switching valve is that although the pressing spring force must be greater than the frictional resistance of the sliding body, it can be set appropriately small because it is not related to the fluctuating gas pressure. Therefore, the suction force that overcomes the spring force is generated with a small difference in output, and the operation can be performed reliably. Therefore, during operation, the spring force acts as a buffer, and the collision force of the seal member against the lid is small, resulting in good υ reliability.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Reference numeral 1 denotes a cylindrical body, in which a high-pressure gas artificial passage 2, a low-pressure gas outlet passage 3, and two switching passages 4.5 are connected to each other so as not to protrude into the inner wall surface 1a of the body. Reference numeral 6 denotes a sliding valve, which is made of a material such as synthetic resin that has good sliding properties. The sliding valve 6 has a contact surface 6a of an appropriate width that contacts the inner wall surface 1a of the body 1, and the contact surface 6a is formed in an arc shape to form a space 7. When the slide valve 6 moves to either the left or right side, the low pressure gas outlet passage 3 and either the switching passage 4 or 5 open into the space 7 and communicate with the space 7. 8 is a connecting member with a seal portion 9 on one side;
The other end has a guide hole 11 for the shaft 10 of the rotation prevention means and is formed to cover the entire slide valve 6 so as to protect the slide valve 6 from high pressure gas. 12 is a gas vent hole. The shaft 10 is provided at a position off the center of the body 1 to prevent rotation of the connecting member 8 and to prevent the space 7 of the sliding valve 6 from coming out of each passage of 3.4.5. There is. Reference numeral 13 denotes a pressure spring, which is incorporated in an airtight chamber 15 between the seal portion 9 and the lid 14, and the inner side 14a of the lid 14 is a spring receiver. Reference numeral 16 designates a three-way solenoid valve for operation, in which a high-pressure gas conduit 17, a low-pressure gas conduit 18, and a conduit 19 extending through the lid and opening into the airtight chamber 15 are connected, and a switching valve 20
, plunger 21 that holds the switching valve 20, and suction element 22.
and a coil 23.

Since high-pressure gas is conducted through 16 three-way solenoid valves, it is balanced with the high pressure inside the body 1, and the force of the pressure spring 13 causes the sliding valve 6 to connect the switching passage 5 and the low-pressure gas outlet passage 3. It is in a position to communicate. Next, Fig. 2e shows the case where the coil 23 of the three-way electromagnetic valve 16 is energized, and when the attractor 22 is excited and the plunger 21 is operated to attract, the switching valve 20 conducts the airtight chamber 15 and the low pressure +ljl path. Therefore, the airtight chamber is on the low pressure side, and the slide valve 6 is
moves to line I to communicate the switching passage 4 with the low pressure gas outlet passage 3, and switches the passages as shown by the arrow.

According to the above embodiment, from the high pressure gas inlet passage /+ii
The structure is such that the connecting member 8 protects the cold tofu gas from directly hitting the sliding valve 6 and the sealing part 9, preventing deformation even if discharge impact pressure from the compressor is applied. It has the effect of In addition, even if high-temperature gas flows in, it will hit the metal connecting member and prevent direct contact with the sliding valve 6 and seal part 9, which are made of synthetic resin, etc., thereby preventing heat deformation and deterioration. There is. The seat part is a connecting member 8
Because of the structure, the dimensional accuracy of the inner wall 1a of the fuselage, which maintains airtightness, can be easily processed by finishing only the area where the seat part slides, and since there is only one seat member, the number of parts can be reduced. can be reduced.

In addition, according to this embodiment, the other side of the connecting member 8 can be used as a movement prevention means, since there is no need to assemble the sheet member, and assembly is facilitated. Since the operating mechanism uses a pressure spring 13, the impact force on the lid during operation can be reduced by the buffering action of the pressure spring. Furthermore, the internal members can be assembled outside the fuselage and inserted into the fuselage, and the lid for sealing the fuselage can be attached to only one side, which facilitates manufacturing.

The operating solenoid valve only needs to adjust the pressure in one airtight chamber, so it can be a three-way valve, simplifying the structure and improving υ reliability.

〔Effect of the invention〕

According to the present invention, it is possible to obtain a four-way switching valve having a simple Y structure and having high reliability, which is constructed as described above.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the structure of the four-way switching valve of the present invention, Figure 2 is a sectional view showing the structure of the four-way switching valve of the present invention;
The figure is a structural sectional view showing a state when the operating solenoid valve of the four-way switching valve of the present invention is energized. 1... Body 2... High pressure gas artificial passage 3... Low pressure gas outlet passage 4... Switching passage 5... Other switching passage 6... Sliding valve 7... Sliding valve space
8...Connecting part 9...Seal part 10...Shaft
11... Guide hole 12... Gas vent hole 13...
Oshisho spring 14... Lid 15... Airtight chamber 16...
- Solenoid valve 17... High pressure gas conduit pipe 18... Low pressure gas conduit pipe 19... Conduit pipe 20... Switching valve 2
1...Plunger 22...Attractor 23■・Coil

Claims (1)

[Scope of Claims] 1. An inner cylinder body having a pressure gas artificial passage, a low pressure gas outlet passage, and two switching passages; a sliding valve having a beam that slides and communicates with each other; a connecting member that forms a sealing portion on one side and covers the entire sliding valve; a means for preventing rotation of the connecting member; and a connecting member partitioned by the sealing portion. A four-way switching valve with a structure in which one side of the body is sealed with a spring member that pushes up the seal part and a lid with a conduction pipe. 2. Claim 1 in which the sliding valve is a synthetic resin member
Four-way switching valve as described in section. 3. The four-way switching valve according to claim 1, wherein one side of the body is sealed by plastically processing the end of the body. 4. The four-way switching valve according to claim 1, wherein the operating solenoid valve is a three-way valve.