JPS59180194A - Fixed flow valve and stop valve with said valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a constant flow valve that has both excellent constant flow performance and low noise performance, and a wide valve that includes this valve.

Many types of constant flow valves have been proposed in the past, but most of them have been implemented using an elastic orifice with a flow hole in the center of an elastic body such as rubber. There are widely known ideas regarding the shape and structure of this elastic orifice, or ideas that combine a rectifier such as a needle with this elastic orifice.

A constant flow valve is a valve that has the function of automatically adjusting the flow rate passing through the constant flow valve to be almost constant even if the supply fluid pressure or the pressure difference before and after the constant flow valve changes. , in order to adjust the flow rate, it acts to narrow the flow path within the valve.

This throttling action causes cavitation, which results in increased noise, especially in the case of elastic orifices.
As the flow velocity increases across a range where there is a pressure difference, noise tends to increase.

A conventional example of the elastic orifice described above will be explained with reference to FIGS. 1 to 6.

Figures 1 to 4 show examples in which an elastic orifice 2 is installed in the main body 1, and the diameter d1 of the orifice hole becomes the diameter d2 at a pressure difference P1-P2, so that the flow path is restricted. Indicates the state in which the An increase in the pressure difference P, -P2 will increase the total flow velocity.Since the flow rate is (flow passage size) x (flow velocity), the flow passage size will increase in inverse proportion to the extent to which the flow velocity increases. The flow rate is kept constant for Hayashi and Kosure. Therefore,
With the structure shown in the same figure, if the shape, size, and custom rubber are effectively combined, the flow characteristics (2) required for a constant flow valve can be obtained as shown in FIG. 15.

However, when the flow velocity increases beyond a certain range of pressure difference P
Will it increase? Po.

As a measure against this noise, as shown in FIGS. 5 and 6, a constant flow valve using an elastic orifice is known in which a rectifier such as a needle 3 or a rectifier plate 4 is placed side by side.

However, as mentioned above, it is human nature that a constant flow valve with a simple structure that simultaneously exhibits constant flow performance and low noise has not yet been developed.

In view of the above-mentioned circumstances, the object of the present invention is to provide a new and useful constant flow valve that solves all of the conventional problems, and a stop valve with a 90% gold price.The present invention is characterized by: On the downstream side of the valve housing that forms part of the flow path or that fits into the flow path, an outlet is formed that is smaller in diameter than the inside diameter of the valve housing, and the inside of the valve housing is filled with rubber, etc. A valve body formed of an elastic body is slidably attached, and one or more communication holes are formed in the flow path direction in the valve body, and the communication holes are spaced apart from the center of the valve body. At the same time, when viewed from the direction of the flow path on the outlet side of the above-mentioned outlet location, the outlet is provided so that the outlet and a portion of the flow hole overlap, and furthermore, one side of the valve body and the diameter of the Another feature lies in the fact that a certain gap is formed between the valve body and the inner surface, and another feature resides in that the constant flow valve described above is provided at the discharge part or the inflow part of the tL valve body.

Embodiments of the present invention will be described in detail below based on the drawings. 7th
In the figures and FIG. 8, 10 is a valve housing, in particular 10a is a valve housing that partially and completely forms a pipe, a pipe joint, and a pulp flow path 11;
0b is a valve housing that is fitted into the flow path 12 and fixed by a coupling 13, and 14 is a valve housing whose diameter is reduced from the inner diameter of the valve housings 10a and 10b at a downstream position in the flow direction indicated by the arrow in the same figure. This is the outflow outlet formed by the reduced capital 15.

In the 10th poem 1, 16 is a valve body formed in a circle with an elastic body such as rubber, and this valve body 16 is detachably attached to a groove 17 formed on the inner peripheral surface of the valve housing 10. tB is formed, and 18 is one or two or more communication holes of the same diameter or different diameters formed in the circuit direction of the valve body 1G, and this communication hole 18 is located at a position apart from the center of the valve body 16. In addition to drilling in
The communication hole 18 is located at a position where the outlet 14 and the communication hole 18 partially overlap when viewed from the flow path direction, that is, a position where the communication hole 18 partially opens into the outlet 14. to form.

In FIG. 11, 19 is a gap formed between one side of the valve body 16 and the inner side of the reduced diameter portion 15; At the inner surface of the portion 15 or at the downstream position of the valve body 16, the contact surface 20 of a portion close to the outer periphery of the valve body 16 directly or in contact with the contact surface 20,
A gap 19 is formed radially inside the valve body 16.
Most of the flow holes 18 are provided so as to open into the gaps 19. In the figure, (A) to (D) show each example in which the gaps 19 are provided. A) is a gap 1 formed by a step formed on the inner surface of the reduced diameter portion 15 of the valve housing 10.
9. FIG. 11(b) shows a gap 19 due to a step formed on the valve body 16, and FIG. FIG. 11(d) shows examples of a gap 19 formed by interposing a washer 21 between the inner surface of the reduced diameter portion 15 of the valve housing 10 and one side of the valve body 16.

16 and 17 show other embodiments of the invention, in which FIG. 16 is a sectional view of a stop valve having a constant flow valve fitted into a discharge flow path, and FIG. 17 is a cross-sectional view of a stop valve having a constant flow valve fitted into a discharge flow path FIG. 2 is a sectional view of a stop valve having a constant flow valve in which a part of the discharge flow path is a valve housing, in which the same parts as in the embodiment of the invention described above are designated by the same reference numerals, and overlapping parts will be omitted from description. In the figure, 22 is a stop valve body such as a gate valve, a globe valve, a ball valve, etc. (in this example, a ball valve is shown), and the discharge portion 23 of this stop valve body 22 is provided with the fixed flow valve of the invention described above.

Of these, FIG. 16 shows a pole fitted between the bottom cap (channel) 12 and the channel 12. 17 shows a case in which a part of the flow path (body cap) 11 of the ball valve 22 is used as the valve housing 10a.

In the figure, 24 is the body of the ball valve 22, 25 is a hole having a through hole 29, 26 is a valve stem, sif is a ball seat, and 28 is a valve handle.

Figures 16 and 17 are both examples in which a constant flow valve is provided at the outlet of the stop valve, but the constant flow valve may also be provided at the inlet side of the stop valve, and this is optional depending on the implementation. be.

Next, the effects of each of the above embodiments will be explained.

In FIG. 12, FIG. 12(A) shows a state where the pressure difference is small and the valve body 16 is hardly deformed;
Figure (c) shows a state in which the pressure difference is extremely large and the valve body 16 has reached its maximum deformation for flow rate adjustment, and figure (b) shows the state between (a) and (c), i.e. , shows a state in which the valve body 16 deforms according to the pressure difference and adjusts the flow rate.

Figures 13 (a), (b), and (c) are external views of the constant flow valves (a), (b), and (c) shown in Figure 12, respectively, viewed from the downstream side (right side of the figure). Figures (a), (b), and (c) are A-A, B-B, and B-B in Figure 12 (a), (b), and (c), respectively.
It is a half-cut sectional view of the CC cross section viewed in the arrow direction.

First, Figure 12 (a), Figure 13 (a), and Figure 14 (
In (a), the fluid flowing fc through the flow hole 18 of the valve body 16 reaches the gap 19 between it and the valve housing 10, and the flow that overlaps the flow outlet 14 with a part of the flow hole 18 is as follows. The flow directly flows from the outlet 14 to the downstream side and through the flow hole 18 covered by the reduced diameter part 15 hits the inner surface of the reduced diameter part 15 of the valve housing 10, and a part of the flow flows in the direction of the outlet 14. , and the other is the flow hole 18.
After flowing in the direction of the left and right gaps, it flows out through the outlet 14 to the downstream side.

Next, in FIGS. 12(b), 13(b), and 14(b), the valve body 16 is pushed by the fluid to the position shown in FIG. 12(b).
It is curved as shown in b) to narrow the gap 19 between the valve body 16 and the reduced diameter portion 15 of the valve housing 10. Communication hole 1 of valve body 16
The fluid flowing through 6 reaches the gap 19 between the valve housing 10 and
The flow in which the outflow port 14 and the communication hole 18 overlap flows directly downstream from the outflow port 14, while the flow in the communication hole 18 covered by the diameter reduction valve 15 hits the valve housing 10. , some of them face the direction of the outlet 14, and the others move to the left and right of the flow hole 18, and are directed toward the outlet 14 from the gap 19 between the valve body 16 and the valve housing 10.
flows downstream through the Since the gap 19 between the valve body 16 and the valve housing 10, especially the gap between the corner of the outlet 14 of the valve housing 10, is narrow, the amount that flows out from the gap is limited, and as the differential pressure increases, the gap increases. Even though it becomes narrower and the flow velocity increases, the flow rate does not increase.

Next, in FIGS. 12(C), 13(C), and 14(C), when the valve body 16 bends greatly and comes into contact with the corner of the outlet 14 of the valve housing 10, the valve The fluid flowing through the communication holes 18 of the body 16 flows out only from the part where the outlet 14 and the communication hole 18 overlap and form a mouth, while the fluid flowing through the communication hole 18 handled by the reduced diameter part 15 flows out. Even if it flows into the gap 19, it cannot flow out, and therefore, as shown in FIG.
3 and 14 (c) are the extreme states in which the flow rate can be adjusted to a constant flow rate.

Furthermore, the present invention was able to extremely effectively maintain the noise level at a low level, as shown by the solid line ``noise'' in Figure 15.

This is because, as shown in the conventional examples shown in Figures 1 to 4, the high-speed flow flowing out of the orifice is blown into the secondary piping with a relatively large volume, causing cavity condensation. In the invention, the flow directly flows from the flow port 18 through the flow port 14, which exits from the same flow hole 18, hits the valve housing 10, immediately changes direction to the flow port 14, and becomes a high-speed flow under the influence of the flow. Furthermore, from the flow hole 18 to the valve housing 1
0, the flow that entered the left and right gaps 19 of the circulation hole 18 flows out from the gap 19 toward the center of the flow path, and the kneaded flows interact with each other to reliably prevent the occurrence of cavitation. , the noise level is extremely low.

Further, since the valve body 16 is detachably provided in the valve housing 10, the valve body 16 having the desired communication hole 18 can be installed using the rotary valve housing 10.
can be replaced as appropriate, so several levels of flow rates can be reliably obtained.

Further, since the constant flow valve described above is provided at the discharge section 23 or the inflow section of the stop valve main body 22, it is possible to obtain a stop valve that can adjust the flow rate to a constant flow rate and maintain a low level of noise.

As is clear from the above, according to the present invention, it is possible to provide a constant flow valve that has both constant flow performance and low noise performance, and a stop valve that includes this constant flow valve.

Note that the constant flow valve of the present invention can be widely applied not only to valves but also to pipes, pipe joints, and the like.

[Brief explanation of the drawing]

Figures 1 (A), (B) to Figure 4 (A), (B) show conventional examples, including a state in which an elastic orifice is attached to the valve body and a state in which the flow path is constricted. Cross-sectional diagrams shown respectively,
5 and 6 show conventional examples, and are cross-sectional views showing a state in which a needle and a rectifier such as a rectifier plate are placed side by side with a constant flow valve using an elastic orifice, and FIGS. The figures show an embodiment of the present invention, and FIG. 7 is a cross-sectional view of a constant flow valve in which part of the pipe, pipe joint, pulp, etc. forming the flow path is used as the valve housing, and FIG. 8 is a cross-sectional view of the flow path. Figure 9 is a side view of Figure 8, and Figure 10 (
A), (B), and (C) are side views showing each example of the valve body according to the present invention, and Fig. 11 (A), (B), (C), and (D).
12A and 12B are cross-sectional views showing examples of the gap formed between one side of the valve body and the inner side of the reduced diameter part of the outlet.
, (c) is a sectional view showing the deformed state of the gap and the valve body in the present invention, FIG. 13(a) is a side view of FIG. 12(a),
Figure 13 (B) is a side view of Figure 12 (B), Figure 13 (C) is a side view of Figure 12 (C), and Figure 14 (1) is a side view of Figure 12 (I). ), Fig. 14 (b)
are sectional views taken along line B-B in Figure 12 (B) and Figure 14 (C).
, is a sectional view taken along the line C-C in FIG. 12(c), and FIG. 15 is a chart showing the flow rate characteristics and noise state of the constant flow valve in the present invention in comparison with a conventional example. 16 and 17 show embodiments of other inventions.
The figure is a cross-sectional view of a stop valve having a constant flow valve fitted into a discharge flow path, and FIG. be. 10 (10a, 10b)...Valve housing 11, 12...Flow path 14...Outlet port 15...Reduced diameter portion 16...Valve body 18...Flow hole 19...Gap 22 ...Stop valve body 23...Discharge part Patent applicant Hayashi Shiki Company Kitazawa Valve Agent Patent attorney Tetsuo Kobayashi Fig. 15 Fig. 16 Fig. 520- Fig. 17

Claims (2)

[Claims] (1) A full-length outlet with a smaller diameter than the inner diameter of the valve housing on the downstream side of the valve housing that forms part of the flow path or that fits into the flow path;
The entire valve body made of an elastic material such as rubber is removably attached inside the valve housing, and this valve body has one or more communication holes formed in the direction of the flow path. The communication hole is arranged at a distance from the center of the valve body, and is provided so that the above-mentioned outlet is partially overlapped with the flow hole when viewed from the direction of the flow path of the outflow rotor 1j, and further A constant flow valve, characterized in that a constant gap is formed between one side surface of the diameter-reduced portion and the inner surface of the diameter-reduced portion. (2) The valve housing, which is formed of a part of the flow path, is formed with an outlet that is smaller in diameter than the inside diameter of the valve housing on the downstream side of the valve housing that fits into the flow path, and the inside of the valve housing is made of rubber. A valve body k made of an elastic body such as
M is removably attached, and this valve body is fully formed with one or more communication holes in the direction of the flow path, and the communication holes are arranged at a distance from the center of the valve body, and the above-mentioned The outlet is provided so that -m of the outlet and the flow hole overlap when viewed from the direction of the flow path on the outlet side, and a constant distance is provided between the one force side of the valve body and the inner side of the reduced diameter portion. 1. A stop valve having a constant flow valve with a gap formed therein, characterized in that the valve is provided at the discharge part or inflow part of a stop valve main body made of gate pulp, globe pulp, ball pulp, etc.