JPH0366984A - Valve device - Google Patents

Abstract

PURPOSE:To reduce the number of parts so as to improve assembling work performance by interposing the peripheral part of a thick irregular-shaped diaphragm directly between a housing and a casing. CONSTITUTION:The peripheral part 24a of a diaphragm 24 bakingly integrated with a valve body 22 is interposed between a case 5 and a housing 1 as well as formed into thick irregular shape. This peripheral part 24a seals between the case 5 and the housing 1, thereby unnecessitating the existing seal. Moreover, a snap-fit part 23f is locked into a locking hole 21, so that the diaphragm 24 is prevented from being pushed out onto the side of a first and a second by-pass passages 3, 4, thereby obviating the existing plate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a valve device that suppresses abnormal pressure rise in an intake passage upstream of a throttle valve, which occurs during deceleration when the throttle valve closes, for example.

[Conventional technology]

Fig. 2 is a sectional view of the main part of a supercharging pressure control valve device as an example of a conventional valve device. ) are first and second bypass passages that communicate with an intake passage (not shown) formed inside the air intake passage.

(5) is attached to the housing (1) via a bolt (not shown).
(5a) is a bent part bent on the periphery of the case (5), (6) is sandwiched between the case (5) and the housing (1), and both (5), (1) A rubber seal that seals between the
) is sandwiched between the diaphragm (7) and the seal (6) and prevents the diaphragm (7> from being pushed toward the first and second bypass passages (3) and (4) by a spring (13>, which will be described later). A prevention plate (8) is a valve seat formed on the end face of the second bypass passage (4), (9> is a resin valve body baked into the diaphragm (7), (1)
0) is in contact with the valve seat (8) and is connected to the second bypass passage (4).
(11) is a cylindrical holder provided in the case (5) (12> is a support that can freely slide on the inner peripheral wall of this holder (11>), (13) is a support ( 12) and the holder (11), and (14) is a nipple provided at the upper part of the case (5) and communicating with the downstream side of a throttle valve (not shown).

Next, the operation of the boost pressure control valve device configured as described above will be explained. In a car and under high-load operating conditions, the throttle valve is close to the fully open state, and due to the supercharging effect of the supercharger fan (not shown), both the intake passage and the intake passage downstream of the throttle valve are at a high temperature. The diaphragm (7) is in a positive pressure state, and the spaces on both sides of the diaphragm (7) are at the same positive pressure.As a result, the diaphragm (7) has a spring (13
) acts on the valve body (9) in the valve closing direction, the seal portion (10) comes into contact with the valve seat portion (8), and the valve body (9> is in a completely closed state).

When the above-mentioned medium and high load operation changes to deceleration operation where the throttle valve suddenly closes, the pressure in the intake passage downstream of the throttle valve changes to high negative pressure, and the inside of the case (5) becomes high negative pressure. Further, as long as the fan is rotating, the pressure inside the second bypass passage (4) increases and becomes a high positive pressure, and as a result, the valve body (9) opens against the elastic force of the spring (13), and the pressure increases. Pressurized air circulates between the first bypass passage (3) and the second bypass passage (4), and pressure increase on the upstream side of the throttle valve is prevented.

[Problem to be solved by the invention]

In the conventional boost pressure control valve device configured as described above, a seal (6) must be provided between the case (5) and the housing (1) to maintain sealing performance, and therefore parts There were problems in that the number of points increased and the workability of attaching the case (5) to the housing (1) deteriorated.

The present invention has been made to solve these problems, and aims to provide a valve device that can reduce the number of parts and improve assembly workability.

[Means to solve the problem]

In the valve device according to the present invention, the peripheral edge of a thick, uneven diaphragm is directly sandwiched between a housing and a case.

[Effect]

In this invention, the periphery of the diaphragm maintains a seal between the housing and the case. .

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
The same or corresponding parts as in the figures are given the same reference numerals, and the explanation thereof will be omitted.

In the figure, (20) is a bottomed cylindrical support, (2
1) is a locking hole formed on the bottom of the support (20),
22) has a wedge-shaped snap fit part (2
3), the resin valve body (24) is a diaphragm that is integrated with the valve body (22), and the peripheral edge (24a) of this diaphragm (24) is connected to the case (5) and the housing (24). 1>, and is thick and has an uneven shape.

In the boost pressure control valve device configured as described above, the peripheral edge (24 m) of the diaphragm (24) seals between the case (5) and the housing (1), and the conventional seal (6)
becomes unnecessary. In addition, since the snap-fit portion (23) is locked in the locking hole (21), the diaphragm (24)
is prevented from being pushed out to the first and second bypass passages (3), (4), and the conventional plate (2) becomes unnecessary.

In the above embodiment, a supercharging pressure control valve device was explained as the valve device, but the present invention is of course not limited to this, and the passage is controlled by a valve body interlocked with a diaphragm operated by a pressure difference between the compartments. It can be applied to a valve device that shuts off.

〔Effect of the invention〕

As explained above, in the valve device of the present invention, the peripheral edge of the thick, uneven diaphragm is directly sandwiched between the housing and the case, thereby reducing the number of parts and improving assembly workability. There is an effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention, and FIG. 2 is a sectional view showing an example of a conventional boost pressure control valve device. In the figure, (1) is the housing, (3) is the first bypass passage, (4) is the second bypass passage, (5) is the case, (22) is the valve body, (24> is the diaphragm, and (24) is the case.
a) is the periphery. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] The device includes a housing in which a fluid passage is formed, a case attached to the housing, a diaphragm provided in the case, and a valve body attached to the diaphragm to shut off the passage by the operation of the diaphragm. In the valve device according to the present invention, the peripheral edge of the diaphragm is directly sandwiched between the housing and the case, and is thick and has an uneven shape.