JPH01141284A - Flow regulation valve - Google Patents

Abstract

PURPOSE:To control flow corresponding to variation of viscosity of oil by composing one of a pair of regulation springs functioning onto the opposite end faces of a valve body from shape memory alloy. CONSTITUTION:A tubular valve body 26 is fitted slidably over the central section of a valve guide 25. First inlet hole 23 and a valve insertion hole 22 are communicated under restricted state through an inclined groove 28 formed in the outer circumference of the valve body 26. Position of the valve body 26 is determined through balance of forces of a pair of regulation springs 34, 37 which energize the valve body 26 in the opposite directions. Since the spring 34 is composed of shape memory alloy for varying spring constant, flow of such as oil can be maintained constant regardless of temperature variation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a flow rate regulating valve used primarily to regulate the closing speed of a door closer.

BACKGROUND ART FIGS. 3 and 4 show the structure of a conventional door closer of this kind. In Figure 3, the closer body (1) is attached to the door, and at the tip of the arm (2) pivotally attached to the closer body (1),
One end of the connecting rod (3) is pivotally connected, and the other end of the connecting rod (3
) The other end is pivoted to the building side. Said arm (2)
is the main shaft (in Fig. 3) which is supported on the door closer body (1).
4). A pinion (5) formed on this main shaft (4) meshes with a rack (7) on the side of a piston (6) inserted into the closer body (1). When the door is opened, the arm (2) rotates, and as the arm (2) rotates, the main shaft (4) similarly rotates, and the piston is rotated through the pinion (5) and rank (7). (
6) to the right in the figure against the force of the spring (8).

Figure 3 shows the door opened and slid to the right. When the door is released from this state, the piston (7) is pushed back in the opposite direction by the force of the spring (8). This causes the arm (2) to pivot in the opposite direction and close the door. At that time, the oil filled in the closer body (1) flows from the chamber (9) on the opposite side to the spring (8) side of the piston (7) to the oil passage (10) also formed in the door closer body (1). ) into the spring-side chamber (11). In this conventional example, an adjusting screw (12) for changing the cross-sectional area of the oil passage (10) is provided at one location of the oil passage (10). By changing the penetration depth, it is possible to change the speed at which the oil flows, that is, the speed at which the door closes.

Problems to be Solved by the Invention Therefore, in the above-mentioned conventional door closer, the closing speed of the door closer can be changed by changing the oil flow speed, but this speed change also depends on changes in temperature. Due to the accompanying changes in the viscosity of the oil, it is difficult to maintain it constant throughout the year, and therefore the adjusting screw (12) must be adjusted seasonally. However, it is unreasonable to expect users to make this adjustment, and in the end, in the winter when the viscosity is high, the closing speed of the door becomes slow (and by forcing a door that is not working properly to close, it may cause oil leakage or other malfunctions in the door closer itself). At present, the closing speed becomes too fast due to the low viscosity during the summer, causing problems such as vibration and noise.

In addition, in order to solve this problem, the ultimate solution is to use an oil whose viscosity changes little with temperature, but such an oil with a constant viscosity has not actually been developed.

In view of the above problems, this invention provides a valve that can control the flow rate according to changes in the viscosity of oil due to seasonal temperature changes, and aims to eliminate the drawbacks of the door closer, etc. It has been done.

Means for Solving the Problems In order to achieve the above object, the present invention provides a valve guide (25) that is inserted into the valve insertion hole (22) so that its position in the insertion direction can be adjusted. A valve body (26) is fitted onto the outside so as to be freely movable, and a pair of adjustment springs (34) and (37) acting in mutually opposite directions in the sliding direction of the valve body are applied to both end surfaces of the valve body (26). The present invention is characterized in that at least one of the adjustment springs (34) and (37) is made of a shape memory alloy whose spring constant changes according to temperature changes.

Effect According to the configuration of the present invention, one of the springs (34) made of a shape memory alloy changes its spring constant depending on the temperature change, so the change in the spring constant is caused by oil etc. By adjusting the flow rate to match viscosity changes, the flow rate of oil, etc. can be kept constant regardless of temperature changes. The flow rate regulating valve of the present invention is applicable not only to the above-mentioned door closer but also to various hydraulic equipment and distribution devices for oil or other liquids. Furthermore, by adjusting the position of the valve guide (25) in the valve insertion hole (22), the initial setting of the flow rate of oil, etc. can be easily performed.

Embodiment In FIG. 0, which shows the structure when the oil flow 111 valve of the door closer is implemented in FIG. 1, a valve insertion hole (22) is formed in the door closer body (21) from its end. has been done. A pair of oil inlet holes (23) communicating with one chamber (9) side and the valve insertion hole (22) side of the same piston (7) as in FIG. )
(24) are formed at intervals in the sliding direction of the piston (7). (25) is a rod-shaped or pin-shaped valve guide, and a cylindrical valve body (26) is slidably fitted around the substantially central portion of this valve guide (25). This valve body (26) is connected to the valve guide (25) in this way.
The valve body (26) is inserted into the valve insertion hole (22) in a state in which it is externally fitted into the valve body (26). Population hole (23)
and the inside of the valve insertion hole (22) are communicated in a throttled state. Note that the other second artificial hole (24) communicates with the valve insertion hole (22) in such an unrestricted state.
(29) is an adjustment bolt screwed in by screwing the male thread (30) at the tip into the female thread formed on the mouth side of the valve insertion hole (22); Pol) (
The end of the valve guide (25) is inserted into the recess (31) formed from the inner end of the valve guide (29). In addition, in the groove (32) formed on the outside of this male thread part (30),
A sealing O-ring (33) is provided. The mouth end of the recess (31) of this adjustment bolt (29) is formed to have a large diameter, the bottom surface of this large diameter portion serves as one spring receiving surface, and the end surface of the valve body (26) and this spring receiving surface One adjustment spring (34) is interposed between them. On the other hand, the inner end of the valve guide (25) is formed with a large diameter to form a spring receiving surface (35) facing the other end surface side of the valve body (26). ) Another adjustment spring (37) is provided between the inner end surface and its spring receiving surface (35).

(38) is the inner end of the valve guide (25) and the valve insertion hole (22).
) This is a compression spring for initial settings inserted between the back wall and the back wall.

An oil outlet hole (41) is formed from a hollow portion (39) opened from the back wall of the valve insertion hole (22) toward the chamber (11) on the other side of the piston (7).

In the above, due to the balance of the forces of the pair of adjustment springs (34) and (37) which urge the valve body (26) in opposite directions on both ends of the valve body (26), the valve body (26) will be determined, thereby determining the open area of the throttle passage (40) between the first inlet hole (23) and the valve insertion hole (22). In this embodiment, these adjustment springs (34
) At least one of the springs (37), for example the spring (34) on the left side of the figure, is formed of a shape memory alloy whose spring constant changes depending on temperature changes. At this time, the other adjustment spring (37) may be a normal spring, and in this case functions as one bias spring. In addition,
Communication between the inside of the valve insertion hole (22) and the outlet hole (41) is performed through a gap between the outer periphery of the valve guide (25) and the valve insertion hole (22).

In the above configuration, the piston (7) slides in conjunction with the opening and closing of the door, as in FIG. 3, and when the door closes, the piston (7) slides to the left. At this time, both the first and second artificial holes (23) and (24) communicate with the valve insertion hole (22), and both of these inlet holes (23)
) (24) Second artificial hole (24) that does not have a particular aperture
Through the side, the oil in chamber (9) moves to the opposite chamber (11) side. When the piston (7) reaches the position indicated by the two-dot chain line in the figure, for example, the second inlet hole (24) that is not constricted is closed by the piston (7), so that the chamber (9) is closed. The oil inside is drained from the first inlet hole (23
) side, the amount of oil discharged is significantly reduced, the movement speed of the piston (7) is reduced, and the door is closed slowly. The amount of oil that escapes from the first artificial hole (23) through the aperture when the door is closed varies greatly depending on the viscosity of the oil. On the other hand, in the summer, the viscosity is lower, so it closes faster. Therefore, if the adjustment spring (37) made of the above-mentioned shape memory alloy is set to a spring constant commensurate with the change in flow rate caused by the change in viscosity, the open area of the aperture can be made smaller in the summer when the viscosity is low. It is automatically adjusted to increase in winter when the viscosity increases, so there is no need to make any special adjustments.

FIG. 2 shows a graph showing the spring characteristics of the spring (34) made of the shape memory alloy. This graph shows a length of 2.2 mm in the high temperature range. The length of the spring is set to be ! This figure shows the results of measuring the reaction force F when compressed to , along with the temperature change. As can be seen from this figure, the spring (34) made of a shape memory alloy is set so that its spring constant increases as its temperature increases.

In this graph, the side indicated by the black circle is when the temperature is rising, and the side indicated by the white circle is when the temperature is decreasing, and there is a slight hysteresis. For those who do not, there is no problem at all.

In the embodiment shown in FIG. 1, the outer periphery of the valve body (26) is made small in diameter corresponding to the end of the second artificial hole (24) on the valve insertion hole (22) side, and an annular slit is formed on the outer periphery. (42) is formed, and oil flows into the valve insertion hole (22) through this slit (42). On the other hand, the first artificial hole (23)
The outlet part on the valve insertion hole (22) side is connected to this insertion hole (22).
) has a large inner diameter, and similarly has an annular slit (43
) is provided, and the slit (43) communicates with the inclined groove (28). The aperture (40) is located between the inclined groove (28) and the slit (43).
) is configured.

Effects of the Invention As described above, according to the present invention, even if the viscosity of oil changes depending on temperature changes, the flow rate can be kept constant by changing the spring constant of the spring made of a shape memory alloy. This has the effect of making it possible to obtain a flow rate regulating valve that always maintains a constant flow rate without having to make special flow rate adjustments in response to temperature changes. In this invention, since the valve body is slidably fitted onto the valve guide, the position of the valve body with respect to the valve insertion hole, that is, the aperture area, can be set by adjusting the insertion depth of the valve guide. This has the effect of making it easy to initialize the flow rate.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the flow rate regulating valve of the present invention, FIG. 2 is a graph showing changes in the spring constant of a shape memory alloy spring due to temperature changes, and FIG. 3 is an external view of a conventional door closer.
FIG. 4 is a longitudinal sectional view of the door closer as well. (22)...Valve insertion hole, (25)...Valve guide, (
26)... Valve body, (34) (37)... Adjustment spring. Patent Applicant Sekisui House Co., Ltd. Agent Patent Attorney Hisayuki Tarumoto Figure 2 5 JLIL (0C)

Claims (1)

[Claims] 1. A valve body is slidably fitted onto a valve guide inserted into a valve insertion hole so that its position in the insertion direction can be freely adjusted, and a valve body is fitted on both end faces of the valve body. A flow rate regulating valve, characterized in that a pair of regulating springs acting in opposite directions of movement are energized, and at least one of the regulating springs is made of a shape memory alloy whose spring constant changes according to temperature changes. . 2. Screw the valve guide directly into the mouth of the valve insertion hole, or
Alternatively, the valve guide is held by a bolt screwed into its mouth, and a compression spring is interposed between the inner end of the valve guide and the back wall of the valve insertion hole. valve.