JPH04121585U - flow adjustment valve - Google Patents

Abstract

(57) [Summary] [Purpose] To enable fine adjustment of small flow rates in an automatic liquid preparation device that supplies different liquids in set amounts into a container from multiple valves. [Structure] A valve body 9 with a valve seat 10 is provided at the bottom of the valve body 7 in which the stem 8 can be moved up and down, and a liquid supply port 11 is provided, and the inner surface is made into a cylindrical shape so that the stem 8 can be tightly fitted. The valve seat 10 has an inner circumferential end surface of a formed liquid outlet 12 opened at the lower end as a ground plane 13,
The cylindrical inner wall surface has a downwardly tapered inclined groove 1.
4, and a linear small-diameter groove 15 formed from the lower end of the groove 14 to the ground plane 13.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a flow rate adjustment valve, particularly for fine adjustment of small flow rates in automatic liquid preparation equipment. This relates to a valve that enables adjustment.

0002

[Conventional technology]

An automatic liquid preparation device consists of multiple fixed valves and a movable container. Ru. Each valve supplies liquid with different contents and a set supply amount. The container can be placed on a moving trolley and moved between each valve in turn. It is designed to stop below the set valve. Volume from each valve The amount of liquid supplied into the container differs depending on the valve, and the accuracy of the amount supplied is required. being sought after.

0003 Figures 7 and 8 show an example of a flow rate adjustment valve used in a conventional automatic liquid preparation device. The valve body 1 includes a stem 2, a valve body 4 including a valve seat 3 connected to the lower part, and a liquid supply. The basic configuration includes a feeding port 5. The stem 2, which has a tapered conical tip, can be moved up and down by a drive mechanism (not shown). The outer peripheral surface of the stem 2 and the valve seat 3, which can be tightly fitted to the stem 2, The flow area of the liquid supplied from the liquid supply port 5 is changed depending on the relative circumferential area with the inner circumferential surface. to adjust the flow rate of the liquid sent from the inlet port 5, and adjust the liquid flow at the tip of the valve seat 3. It is designed to be supplied from an outlet 6 into a container (not shown).

0004 In FIG. 7, the position of the stem 2 indicated by the chain line is the fully open state of the valve body 1; Further, the position shown by the solid line is a fully closed state. The position of the stem 2 shown in FIG. 8 is Although the liquid flow rate is maximized, the liquid flow rate is limited by the gap between the stem 2 and the valve seat 3. The ratio of the maximum flow rate and the minimum flow rate of the liquid is determined by the circumferential area of the This is the ratio between the position area and the area of E when fully open.

[0005]

[Problem that the idea aims to solve]

In the conventional valve described above, it is possible to adjust the flow rate of the liquid, but the valve body 1 The maximum and minimum flow rate ratio between the stem 2 and the valve seat 3 is about 1:150. It is difficult or impossible to make fine adjustments at low flow rates, and therefore multiple It is extremely difficult to always and accurately supply the amount of liquid from each valve to the container according to the set value. It was difficult. This invention was developed in consideration of the above-mentioned problems with the valves used in the conventional automatic liquid preparation equipment. We aim to provide a valve that allows fine adjustment of liquid flow rate at low flow rates. The target is

[0006]

[Means to solve the problem]

In order to achieve the above object, the present invention has developed a valve body in which the stem 8 can be moved up and down. A valve body 9 having a valve seat 10 is provided at the lower part of the body 7, and a liquid supply port 11 is provided. The valve seat 10 has a cylindrical inner surface so that the stem 8 can be tightly fitted into the valve seat 10, and the valve seat 10 is open at the lower end. The inner circumferential end surface of the liquid outlet 12 formed by , forming an inclined groove 14 that tapers downward, and extending from the lower end of the groove 14 to the ground plane 13. It is characterized in that a linear small-diameter groove 15 is formed over the entire length. Further, the inclined grooves 14 are formed symmetrically on both sides of the cylindrical inner wall surface, and the grooves on one side are formed symmetrically. It is characterized by having a small diameter groove 15 connected to the groove 14. Furthermore, this inclined groove 14 is formed on one side of the cylindrical inner wall surface, and this groove 14 is connected with a small diameter groove 15. . Furthermore, an elastic pressure contact material 16 is provided at the lower end of the stem 8, and the valve seat 10 is It is characterized in that it can be attached to and detached from the valve body 9.

[0007]

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. "First Example" 1 and 2 show an embodiment of the valve of the present invention, 7 is a valve body, 8 is a stem, 9 is the valve body, 10 is the valve seat, and 11 is the liquid supply port, which are common to conventional valves. It is something to do. The stem 8 can be moved up and down within the valve body 7 by a drive mechanism (not shown). Further, the valve seat 10 is integrally formed at the lower part of the valve body 9.

[0008] The valve seat 10 has a cylindrical inner surface so that the lower part of the stem 8 can be tightly fitted into the valve seat 10. The inner circumferential end surface of the liquid outlet 12 formed by opening at the lower end is used as the ground plane 13, and the cylindrical On both sides of the inner wall surface of the shape, there is an inclined groove 1 that tapers downward and has a rectangular cross section. 4 are formed symmetrically, and from the lower end of the inclined groove 14 on one side to the ground plane 13 is a straight line. It is characterized in that a small diameter groove 15 is formed. When viewed from the front, as shown in FIG. It has a downward triangular shape, and a linear groove 15 is formed at the lower end of the triangular shape. It becomes. However, if this triangular body is made into a rectangular body, and the bottom center of this rectangular body is The grooves 15 may be provided consecutively. Further, the inclined groove 14 has a rectangular cross section. Yes, but it can also be circular.

[0009] When the stem 8 is in the solid line position (O position), the valve is fully open, and the valve is in the O position. The stem 8 is then lowered, and the inclined groove 14 formed on the outer peripheral surface of the stem 8 and the valve seat 10 is removed. The flow rate gradually decreases as the relative circumferential area of , the flow rate is minimized by the outer circumferential surface of the lower part of the stem 8 entering the linear groove 15. (C position). Then, lower the stem 8 further and lower the lower end of the stem 8. When pressed against the ground surface 13 of the valve seat 10, the valve becomes fully closed (position D).

FIG. 3 shows the state of the stem 8 and the inclined groove 14 in the A position, and FIG. 4 similarly shows the state in the B position. Furthermore, FIG. 5 shows the positional relationship between the stem 8 and the linear groove 15 at the C position. As a result, it can be seen that as the stem 8 descends, the area with the inclined groove 14 becomes narrower, and becomes the minimum in terms of the positional relationship with the groove 15. In FIG. 3, if the distance between the stem 8 and the groove 14 is 4 mm, and the width distance of the groove 14 when viewed from the front is 10 mm, the area of the distance between the stem 8 and the groove 14 is 4 x 10 x 2 = 80 ^mm2. Become. In FIG. 4, if the interval between the stem 8 and the groove 14 is 2.5 mm, and the width interval of the groove 14 when viewed from the front is 5 mm, the area of the interval between the stem 8 and the groove 14 is 2.5 mm. 5 x 5 x 2 = 25 mm ² . Similarly, the distance between the stem 8 and the groove 14 is set to 0. 5 mm, and the width interval of the grooves 14 when viewed from the front is 1 mm, the interval area between the stem 8 and the grooves 14 is 0.5×1=0.5 mm ² . Furthermore, when the stem 8 is in the fully open position (O position), π/4 x 20 ² = 314 mm ² , the flow area ratio is 0.5:314, and the ratio of the minimum flow rate to the maximum flow rate is 1:500. . The numerical values shown above are just examples, and by changing each numerical value, valves of various sizes can be obtained.

[0011] Table 1 shows the flow rate curves when using the valve of the present invention and the conventional valve, where the two-dot chain line a indicates the conventional valve at a pressure of 0.2 Kg/ ^cm2 , and the solid line b indicates the same at a pressure of 0.2 Kg/cm2. The invented valve in ² , the dashed line c shows the flow rate curve of the invented valve at a pressure of 0.6 kg/cm ² , and the invented valve has a larger stroke at small flow rates than the conventional valve. It is shown that.

[Table 1]

0012 “Second Example” Figure 6 shows another embodiment of the present invention, in which the same parts as above are given the same reference numbers. I am using it. In this embodiment, the lower end of the stem 8 is made of synthetic resin with appropriate elasticity. It is characterized in that the contact material 16 is provided in a removable manner. Having this configuration Therefore, the pressure welding material 16 is in close contact with the ground surface 13 of the valve seat 10, and liquid leakage is prevented when the valve seat is fully closed. This can be prevented. In addition, as shown in FIG. 6, the valve seat 10 is made separately from the valve body 9, and the valve seat 10 is If it is removable from the valve seat 10, it is easy to process and form the inner peripheral surface of the valve seat 10 and the grooves 14 and 15. And it can be done precisely. In each of the above embodiments, the inclined grooves 14 are provided symmetrically on both sides of the valve seat 10. Although the groove 14 has been described above, the groove 14 may be provided only on one side, and the groove 14 may have a straight groove 15 It is sufficient to set the .

[0013]

[Effect of the idea]

According to the present invention described above, the inner surface is made cylindrical, and the inner periphery of the liquid outlet 12 is A downwardly inclined groove 14 is formed on the inner circumferential wall surface of the valve seat 10 whose end surface is the ground plane 13. At the same time, a linear groove 15 is formed from this groove 14 to the ground plane 13. When the liquid is supplied from the liquid supply port 11, the stem 8 is lowered and the inclined groove 1 The flow rate can be adjusted by gradually changing the circumferential area between 4 and the outer circumferential surface of stem 8. Ru. The minimum flow rate is adjusted by the relative circumferential area between the outer circumferential surface of the stem 8 and the linear groove 15. It is possible to control and adjust small flow rates accurately and with high precision. It is. Therefore, the valve of the present invention allows liquids with different components to be determined from multiple valves. It is most suitable for use in an automatic liquid preparation device that supplies liquids by volume into containers. If an elastic pressure contact material 16 is provided at the tip of the stem 8, the contact surface with the valve seat 10 can be improved. The pressure increases and liquid leakage can be completely prevented. Furthermore, if the valve seat 10 is made detachable from the valve body 9, processing of the valve seat 10, This improves the precision of formation and is convenient for maintenance, inspection, and cleaning of the valve body 9.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view showing one embodiment of the valve of the present invention.

FIG. 2 is an explanatory diagram showing a cross section taken along line XX in FIG. 1;

FIG. 3 is an explanatory view of the stem in the A position in FIGS. 1 and 2, viewed from a plane.

FIG. 4 is an explanatory view of the stem at position B in FIGS. 1 and 2, viewed from a plane.

FIG. 5 is an explanatory diagram of the stem in the C position seen from a plane in FIGS. 1 and 2;

FIG. 6 is an explanatory cross-sectional view showing another embodiment of the valve of the present invention.

FIG. 7 is an explanatory cross-sectional diagram showing fully open and fully closed states of a conventional valve.

FIG. 8 is an explanatory cross-sectional view showing a low flow rate state in a conventional valve.

[Explanation of symbols]

1 Valve body 2 stem 3 Valve seat 4 Valve body 5 Liquid supply port 6 Liquid outlet 7 Valve body 8 Stem 9 Valve body 10 Valve seat 11 Liquid supply port 12 Liquid outlet 13 Ground plane 14 Slanted groove 15 Straight groove 16 Pressure welding material

Claims (5)

[Scope of utility model registration request] 1. A valve body 7 with a stem 8 movable up and down is provided with a valve body 9 having a valve seat 10 and a liquid supply port 11 at the bottom of the valve body 7, the inner surface of which is cylindrical so that the stem 8 can be tightly fitted into the valve body 7. The valve seat 10 has a ground surface 13 on the inner circumferential surface of the liquid outlet 12 formed by opening at the lower end, and a downwardly tapered inclined groove 14 on the cylindrical inner wall surface.
, and a linear small-diameter groove 15 is formed from the lower end of the groove 14 to the ground plane 13. 2. The flow rate regulating valve according to claim 1, wherein the inclined grooves 14 are formed symmetrically on both sides of the cylindrical inner wall surface, and a small diameter groove 15 is connected to the groove 14 on one side. 3. The flow rate regulating valve according to claim 1, wherein the inclined groove 14 is formed on one side of the cylindrical inner wall surface, and a small diameter groove 15 is connected to this groove 14. 4. The flow rate regulating valve according to claim 1, further comprising an elastic pressure contact material 16 provided at the lower end of the stem 8. 5. The flow rate regulating valve according to claim 1, wherein the valve seat (10) is detachably attached to the valve body (9).