Seal structure and a temperature expansion valve
A sealing structure and sealing surface technology, which is applied in the field of temperature expansion valves, can solve problems such as misalignment, failure to maintain sealing, and misalignment of sealing surfaces to achieve the effect of ensuring sealing
Active Publication Date: 2015-04-08
SAGINOMIYA SEISAKUSHO INC
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- Description
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- Application Information
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Problems solved by technology
[0008] As in Patent Document 1, in a temperature expansion valve, only the outer threaded part and the inner threaded part are used to screw the cover and the valve housing of the diaphragm device to ensure mutual airtightness. The cylindrical part of the holder part) is deformed due to the pressure increase in the pressure equalization chamber, and the contact surface (sealing surface) between the lower end of the cylindrical part and the stepped part is misaligned, and there is a problem that the airtightness cannot be maintained.
Also, if both sealing surfaces are tapered as in Patent Document 2, there is a similar problem that the sealing surfaces are displaced when one of the cylindrical parts is deformed.
Method used
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Embodiment Construction
[0028] Embodiments of the sealing structure and the temperature expansion valve of the present invention will be described below with reference to the drawings. figure 1 is a partially enlarged cross-sectional view of the temperature expansion valve of the embodiment, figure 2 It is an enlarged cross-sectional view of main parts of the first embodiment showing the sealing structure of the temperature expansion valve of the embodiment, image 3 It is an enlarged cross-sectional view of a main part of the second embodiment showing the sealing structure of the temperature expansion valve of the embodiment, Figure 4 It is an enlarged cross-sectional view of a main part of a third embodiment showing a sealing structure of a temperature expansion valve according to an embodiment, Figure 5 It is a longitudinal sectional view of the temperature expansion valve of embodiment.
[0029] The temperature expansion valve of this embodiment has a brass valve case 10 and a diaphragm devi...
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Between the sealed valve housing (10) and the diaphragm assembly (20) of a seal structure and a temperature expansion valve of the present invention, a high tightness can be obtained even when the pressure rise. An external threaded portion (11) and a stepped portion (12) is formed in the outer periphery of a first cylindrical portion (1) of the valve housing. An internal threaded portion (21) is formed in the inner circumference of a second cylindrical portion (2) of the lower cap (20b) of the diaphragm assembly. Projecting strips (22) are formed on the opening end portion (2A) of the second cylindrical portion. The opposed surfaces of the stepped portion are respectively used as a first sealing surface (12A) and a second sealing surface (22A). The area of the second sealing surface is allowed to be smaller than the area of the first sealing surface. For example, the second sealing surface is made to be a flat surface perpendicular to an axis (L), and the first sealing surface is made to be a conical surface. Inward stress is generated at the opening end portion of the second cylindrical part by using the thrust generated by the tightening of the second cylindrical portion and the first cylindrical portion.
Description
technical field [0001] The present invention relates to forming an external thread on the outer periphery of one of two cylindrical parts and forming an internal thread on the inner periphery of the other cylindrical part, and combining the external thread and the internal thread to combine the two cylindrical parts, And, in the device element in which the fluid is filled in the cylindrical part, there is a sealing structure that seals the joint portion of the two cylindrical parts, and a temperature expansion valve using the sealing structure. Background technique [0002] Conventionally, as a temperature expansion valve, there is, for example, a temperature expansion valve disclosed in JP-A-9-79703 (Patent Document 1). The thermal expansion valve (thermal expansion valve) of Patent Document 1 is provided with a temperature-sensing cylinder attached to the outlet pipe of the evaporator, and a diaphragm device (unit part 4') communicating with the temperature-sensing cylinde...
Claims
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IPC IPC(8): F16K27/00F25B41/06
Inventor 高田裕正别所直登
Owner SAGINOMIYA SEISAKUSHO INC