JPH0511409Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an on-off valve that opens and closes fluid.

[Prior Art] A valve structure that reduces the travel distance of the valve body required to fully open the valve seat compared to conventional on-off valves having a circular valve seat has been developed since the beginning of the public sector.
It is publicly known from Publication No. 58-33334 and the like.

The above-mentioned known on-off valve has a large number of divided communication holes arranged in an annular manner, and is a valve in a movable iron core in order to allow fluid to flow to the center hole side of an annular valve body that opens and closes all of the divided communication holes. A flow path leading to the central hole is provided at the back of the body.

However, when a large number of divided communication holes are arranged in an annular manner in this way, when trying to increase the total flow rate of the on-off valve, the circle in which the divided communication holes are arranged becomes large, and the valve box becomes too large for the flow rate. Increases size within the valve seat surface.

In addition, in the above-mentioned on-off valve, a flow path for flowing fluid toward the center hole of the valve body is provided behind the valve body, which not only complicates the configuration of the valve body (movable iron core) but also The valve body or movable iron core becomes larger due to the flow path provided at the back, and the valve body becomes higher.
In this direction as well, there is a problem of increasing the size.

[Problem to be solved by the invention] The technical problem of the invention is to improve the flow path shape of the fluid in an on-off valve where the stroke of the valve element required to sufficiently open the valve seat is small, and to improve the flow path shape of the valve element. An object of the present invention is to obtain an on-off valve that can suppress the enlargement of the operating part side of the valve, thereby suppressing the enlargement of the valve box while increasing the total flow rate.

[Means for solving the problem] In order to solve the above problem, the on-off valve of the present invention is
In a poppet type on-off valve, a valve seat is provided around a flow path between an input port and an output port of a fluid in a valve body, and the valve seat is opened and closed by a valve element.
The technical measure adopted is to form the opening of the output side flow passage surrounded by the valve seat into a ring shape or an elongated rectangular shape, and to recess the input side flow passage through which fluid flows into this opening around the valve seat.

[Function] By forming the opening of the output side flow path surrounded by the valve seat in the on-off valve into an annular or elongated rectangular shape, the circumferential length of the valve seat opening is increased.
A large number of divided communication holes are arranged in an annular shape to reduce the stroke of the valve body necessary to fully open the valve seat.Similar to conventional on-off valves, the flow path is opened with a small stroke of the valve body. However, at the same time, it is possible to suppress the valve box from increasing in size toward the valve seat surface while increasing the total flow rate.

In addition, since the input side flow path that allows fluid to flow into the opening surrounded by the valve seat is recessed around the valve seat, it is compared to the case where a flow path that communicates with the center hole of the valve body is provided behind the valve body. This not only simplifies and miniaturizes the configuration of the valve body or its operating part, but also reduces the distance the valve body must move to fully open the valve seat, and reduces the height of the valve body. It can be made even lower, and the enlargement of the valve box is suppressed.

[Embodiment] Figures 1 to 3 show a first embodiment of the present invention, in which a valve box 1 is equipped with an input port 2 and an output port 3, and an annular narrow output side flow connecting both ports. Valve seats 6 and 7 are provided on the inner and outer peripheries of the opening of the passage 5.
is formed.

On the outside of the outer valve seat 6 on the outer periphery of the annular flow path 5, and on the inside of the inner valve seat 7 on the inner periphery, there are a first annular input flow path 8 and a second circular input flow path.
A flow path 9 is recessed so that both flow paths 8 and 9 communicate with the input port 2, and an annular flow path 5 between the outer valve seat 6 and the inner valve seat 7 communicates with the output port 3. There is.

The valve body 11 that contacts and separates from the valve seats 6 and 7 to open and close the flow path 5 is operated by electromagnetic force, mechanical force (not shown),
It is configured to be driven by an appropriate operating section operated by fluid pressure or the like.

In the first embodiment, the diameter of the outer valve seat 6 is
D ₁ and the diameter of the inner valve seat 7 is D ₂ , the opening area S _p of the flow path 5 is S _p = π/4 (D ₁ ² - D ₂ ² ), and the valve body 11 is separated from the valve seat. The flow path area between the valve body 11 on the valve seat and the valve body 11 when moved by distance x is the open area S ₁ between the first flow path 8 and the flow path 5 =
πD ₁ x and the open area between the second flow path 9 and the flow path 5
The sum of S ₂ =πD ₂ x is (S ₁ +S ₂ ).

On the other hand, the opening area of a valve seat with a circular opening of diameter d is Sd = π/4d ² , and if the amount of movement of the valve body sufficient to open the valve seat is a, then the flow path area on the valve seat is To make πda equal to the opening area Sd of the valve seat,
a=d/4.

Therefore, in the valve structure of the first embodiment, when determining x that satisfies S _p = S ₁ + S ₂ = Sd and comparing it with a, if x < a is obtained, the stroke is reduced by the above structure. You can see that it is getting smaller.

Therefore, since D ₁ ² −D ₂ ² = d ² from S _p = Sd, by setting D ₂ = n・d (n > 0), the amount of movement of the valve body to obtain a flow path area equal to the above Sd is When calculating x, D ₁ ² = d ² (n ² + 1) D ₁ = d√ ² + 1, and on the other hand, from S ₁ + S ₂ = S _p , x = (D ₁ − D ₂ )/4. Therefore, by substituting D ₁ and D ₂ into this, we obtain ∴x=d/4(√ ² +1−n) (1).

Then, taking the ratio of x in the above equation (1) to the above a, it becomes x/a=√ ² +1−n (2).

Since the right side of equation (2) is smaller than 1 when n>0, x<a, and when S _p and Sd are equal, the larger n is, in other words, the larger D ₂ becomes, and the valve becomes smaller. The longer the length in the circumferential direction compared to the width of the seat x
The value of becomes smaller. Therefore, the valve of the first embodiment is
The travel distance of the valve body can be reduced compared to a valve having a circular valve seat.

In addition, the first flow path 8 communicating with the input port 2
Both of the second flow path 9 are recessed around the valve seats 6 and 7 on the valve seat side of the valve body 11 and do not pass through the operation section side of the valve body 11, so that the valve body 11 and the operation section are not connected to each other. The height of the valve box is lower and can be installed in a lower height location.

4 and 5 show a second embodiment of the present invention, in which the same parts as in the first embodiment are given the same reference numerals.

In this second embodiment, the opening of the flow path 17 surrounded by the valve seat 15 is formed into an elongated rectangular shape, and the inflow flow path 16 recessed in the outer periphery of the valve seat 15 communicates with the input port 2. and the outflow passage 1 in the valve seat 15
7 communicates with the output port 3.

In the second embodiment, if the length of the long side of the valve seat 15 is l, the length of the short side is m, and the movement distance of the valve body 11 sufficient to open the valve seat 15 is x, then the opening of the valve seat 15 is The area S _p and the opening area S ₁ between the valve body 11 on the valve seat 15 are as follows: S _p =l·m, S ₁ =2(l+m)x.

On the other hand, the opening area S _s of a square valve seat is S _s = m ² since l = m, and the distance a the valve body moves enough to open this valve seat is a = m ² /2 (m + m). = m/4.

Next, in the second embodiment, the length l of the long side is l=
When n m (n>1), the moving distance x of the valve body to obtain an area equal to the above S _s is x=m ² /2 (nm + m) = m/2 (n + 1), so The ratio of x and a is determined from the above two equations as follows: x/a=2/n+1 (3).

In formula (3), when n>1, x/a<1, and the larger n is, the more rectangular the valve seat 1 becomes.
The value of x becomes smaller as the length l of the long side becomes larger and narrower than the length m of the short side of 5. Therefore, in the valve of the second embodiment, the moving distance of the valve body can be reduced compared to a valve having a square valve seat.

Further, the inflow channel 16 is recessed around the valve seat 15 on the valve seat side of the valve body 11, and the fluid does not pass through the operating section side of the valve body 11. The valve box and the operating section can be brought closer to each other, and the height of the valve box is further reduced, allowing the valve box to be installed in a low-height location.

[Effects of the invention] The on-off valve of the present invention increases the circumference of the valve seat opening by forming the opening of the flow path surrounded by the valve seat into an annular or elongated rectangular shape. Since the fluid flows in from the entire circumference of the seat opening, a large number of divided communication holes are arranged in an annular manner to reduce the stroke of the valve body required to fully open the valve seat. Compared to this, it is possible to suppress the valve box from increasing in size in the direction of the valve seat surface while increasing the total flow rate.

In addition, since the flow path for fluid to flow in and out of the opening surrounded by the valve seat is recessed around the valve seat, it is compared to the conventional example in which a flow path is provided behind the valve body to communicate with the center hole of the valve body. This not only simplifies and miniaturizes the configuration of the valve body or its operating part, but also reduces the distance the valve body must move to fully open the valve seat, and reduces the height of the valve body. It is possible to further lower the valve body and suppress the increase in size of the valve box.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the main parts of the first embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A of Fig. 1, Fig. 3 is a sectional view taken along the line B-B of Fig. 1, and Fig. 4 is A plan view showing the main parts of the second embodiment of the present invention, FIG. 5 is A-A in FIG.
FIG. 1... Valve box, 2... Input port, 3... Output port, 6, 7, 15... Valve seat, 5, 8, 9, 1
6, 17...flow path, 11...valve body.

Claims (1)

[Scope of utility model registration request] In a poppet-type opening/closing valve in which a valve seat is provided around a flow path between both ports in a valve box equipped with a fluid input port and an output port, and the valve seat is opened and closed by a valve body, the valve seats 6 and 7 , 15 are formed into an annular or elongated rectangular shape, and input side channels 8, 9, 16, which allow fluid to flow into these openings, are formed around the valve seat. An on-off valve characterized by being recessed.