JPS6159429B2 - - Google Patents

Description

Detailed Description of the Invention Generally, in a refrigeration cycle, etc., when the temperature of a cooler, etc. falls below a certain temperature, the flow of refrigerant to the cooler is controlled by a valve mechanism. In the valve mechanism, as shown in FIGS. 1 and 2, a valve body 3 for opening and closing a valve hole 2 of a fluid passage 1 is slidably mounted in a cylindrical body 4 that projects upward from the fluid passage 1. It is fixed to the lower end of the inserted movable iron core 5, and
A suction element 7 is attached to the upper part of the cylindrical body 4 via a biasing spring 6 that constantly biases the movable iron core 5 downward, and the upper surface of the suction element 7 is covered with an exterior body made of iron plate or the like. 8 and has a structure in which an electromagnetic coil 10 controlled by a temperature detection switch 9 is installed on the outer periphery of the cylindrical body 4, so that the temperature of the temperature detection part is high. , when the temperature detection switch 9 is OFF, the electromagnetic coil 10 is not energized and the movable iron core 5 is not energized by the energizing spring 6.
The valve body 3 at the lower end opens the valve hole 2 of the fluid passage 1. However, when the temperature detection switch 9 is turned on, the electromagnetic coil 10 is energized and the movable iron The core 5 is attracted toward the suction element 7 against the biasing spring 6, and the valve body 3 at the lower end thereof
moves upward to open the valve hole 2 of the fluid passage 1. However, in this type of valve mechanism, when the valve hole 2 of the fluid passage 1 is opened, the electrode coil 1 is always closed.
0, which requires unnecessary power consumption.

In addition, the permanent magnet attached to the valve rod is brought into direct contact with the temperature-sensitive magnetic material, and changes in the magnetism of the temperature-sensitive magnetic material are used to directly absorb or separate from the permanent magnet. However, in this type of magnet, the permanent magnet and the temperature-sensitive magnetic material are in direct contact, so if the temperature-sensitive magnetic material is placed in a high-temperature area, the heat of the high-temperature area will be It acts on the permanent magnet, and the magnetic force of the permanent magnet deteriorates, making the opening and closing operation of the valve body unstable, and high-temperature heat acts on the valve body through the valve body, valve rod, etc., causing the valve body to deteriorate. There is a drawback to doing so.

The present invention has been made in view of the above-mentioned matters, and it facilitates the incorporation of permanent magnets and temperature-sensitive ferrites, simplifies the assembly of valve mechanisms, and prevents adverse thermal effects on permanent magnets, valve bodies, etc. The purpose is to

Reference numeral 11 denotes a fluid passage having a valve hole 12, and a cylinder body 13 is integrally molded above the valve hole 12, and the cylinder body 13 has a movable iron core 15 having a recess 14 formed on its upper surface. is loaded so that it can slide up and down. 16 is a valve body attached to the lower end of this movable iron core 15, and when the movable iron core 15 moves up and down,
It opens and closes the valve hole 12 of the fluid passage 11. Reference numeral 17 denotes an attractor fixed to the upper part of the cylindrical body 13, and between the lower surface of the attractor 17 and the recess 14 of the movable iron core 15, there is provided a suction element for constantly urging the movable iron core 15 downward. A biasing spring 18 is inserted.
Reference numerals 19 and 20 denote sheathing bodies made of iron or the like fixed to the upper and lower parts of the cylinder 13. One end of the upper sheathing body 19 is tightly attached to the upper surface of the suction element 17, and the lower sheathing body 2
One end of the cylindrical body 13 is in close contact with the outer circumferential wall of the cylindrical body 13.
A permanent magnet 21 is inserted into the other ends of these exterior bodies 19 and 20, and the permanent magnet 21
Temperature-sensitive ferrite 22 is inserted further outwardly at appropriate intervals. This temperature-sensitive ferrite 2
2 detects the temperature and becomes a ferromagnetic material when the temperature is lower than the Curie point, and becomes a low magnetic material when the detected temperature is higher than the Curie point. The magnetic force applied from the permanent magnet 21 to the attractor 17 is controlled. That is, the temperature-sensitive ferrite 22
When the detected temperature does not exceed the Curie point, since the temperature-sensitive ferrite 22 is a ferromagnetic material, most of the magnetic flux from the permanent magnet 21 is distributed between the outer body 19 - the temperature-sensitive ferrite 22 - the outer body. 20, and almost no magnetic flux flows into the magnetic circuit from the exterior body 19 to the attractor 17 to the movable iron core 15 to the exterior body 20,
At this time, the suction force between the attractor 17 and the movable iron core 15 is smaller than the urging force of the urging spring 18, so the movable iron core 15 is pushed by the urging spring 18 and moves downward, and the valve body 16 closes the valve hole 12 of the fluid passage 11 (as shown in the third figure). Therefore, temperature-sensitive ferrite 22
When the temperature detected by the temperature-sensitive ferrite 22 exceeds the Curie point, the temperature-sensitive ferrite 22 rapidly changes from a ferromagnetic material to a low-magnetic material, and the magnetic circuit of the exterior body 19 - the temperature-sensitive ferrite 22 - the exterior body 20 changes. The state is almost equivalent to being cut off, or even if a magnetic circuit is formed, the magnetic flux passing through it is very small. Therefore, the magnetic circuit on the opposite side, that is, the exterior body 19
- Attractor 17 - Movable iron core 15 - Exterior body 20,
Most of the magnetic flux flows from the permanent magnet 21, and therefore, an attractive force greater than the biasing force of the biasing spring 18 acts between the movable iron core 15 and the attractor 17. The iron core 15 is the biasing spring 18
The valve element 16 opens the valve hole 12 of the fluid passage 11 (as shown in the fourth figure).

Therefore, since the structure is such that a permanent magnet and a temperature-sensitive ferrite are juxtaposed to an exterior body that is formed protruding from the side of the cylinder and forms a magnetic circuit together with the attractor and the movable iron core, the permanent magnet and the temperature-sensitive ferrite are juxtaposed. It is extremely easy to incorporate the temperature-sensitive ferrite, making it extremely easy to assemble the valve mechanism. In addition, it is possible to create a distance between the temperature-sensitive ferrite and the permanent magnet, which allows the permanent magnet and valve mechanism to be easily assembled. It is possible to prevent adverse thermal effects from temperature-sensitive ferrite on the body, etc.

The present invention moves the movable iron core up and down by controlling the magnetic flux from the permanent magnet passing through the movable iron core and the attractor using a temperature-sensitive ferrite as described above,
Since the valve hole in the fluid passage is opened and closed by the valve body, there is no need to apply current to the electromagnetic coil to maintain the open or closed state of the valve as in the conventional method. It is extremely economical, operates reliably, has very few failures, and indirectly controls the magnetic force applied to the attractor and movable iron core from the permanent magnet, making it possible to incorporate permanent magnets and temperature-sensitive ferrite. This is extremely easy to do, and since the temperature-sensitive ferrite and the permanent magnet can be separated, the temperature detected by the temperature-sensitive ferrite will not adversely affect the permanent magnet, valve body, etc. Therefore, it is possible to achieve many remarkable effects, such as preventing the opening and closing operation of the valve body from becoming unstable due to the inferior magnetic force of the permanent magnet, and preventing the valve body from deteriorating due to heat.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the conventional valve mechanism when the valve is closed, Fig. 2 is a longitudinal cross-sectional view of the same valve mechanism when the valve is open, and Fig. 3 is a longitudinal cross-sectional view of the valve mechanism of the present invention when the valve is closed. , FIG. 4 shows a longitudinal sectional view of the same valve mechanism when the valve is open. 11: fluid passage, 12: valve hole, 15: movable iron core, 16: valve body, 17: suction element, 18: biasing spring, 21: permanent magnet, 22: temperature-sensitive ferrite.

Claims (1)

[Claims] 1. In a valve mechanism used for opening, closing, or converting a gas or liquid flow path, a valve body inserted into a fluid passage, a movable iron core that moves the valve body,
A suction element that attracts the movable iron core, an urging spring that constantly biases the movable iron core in a direction away from the suction element, a cylindrical body that houses the movable iron core, the suction element, and the urging spring; an exterior body that protrudes from the side of the cylindrical body and forms a magnetic circuit together with the attractor and the movable iron core; a permanent magnet that is provided within the exterior body and applies magnetic force to the attractor and the movable iron core; It is placed in parallel to the outside of the permanent magnet, changes to a ferromagnetic material or a low magnetic material at the Curie point by sensing temperature, and controls the magnetic force applied from the permanent magnet to the attractor by this change. A valve mechanism characterized by being equipped with a temperature-sensitive ferrite that moves a valve body.