JPH0590058U - Digital valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve workability and assemblability of a digital valve without providing a valve seat member that determines the flow rate in the valve body. [Structure] An upstream liquid pool and a downstream liquid pool are laterally opposed to each other in the valve body, and an upward flow path communicating with the upstream liquid pool and a downward flow path communicating with the downstream liquid pool. Is formed by opening in the upper part of the main body, an orifice plate is installed in the opening of the downward flow path, and the element valve is connected and fixed thereon. The orifice plate is a digital valve in which ports are formed so that the cross-sectional area ratio becomes a geometric progression of 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a binary digital valve for adjusting a flow rate of a fluid such as air or water in general industry, and more particularly, to an improvement of a mounting structure of a valve seat portion of an element valve of the binary digital valve.

[0002]

[Prior Art]

A conventional binary digital valve is, for example, the one shown in FIG. 3 disclosed in Japanese Patent Laid-Open No. 63-96366. In this digital valve, an upstream flow path 8 communicating with the inflow port 10 of the valve body 1 and a downstream flow path 9 communicating with the outflow port 11 are arranged so as to face each other via a partition wall 13, and the upstream flow path 8 (N ≧ 2, N = 4 in the figure) element valves that connect and block 8 and the downstream side flow passage 9 are provided in the partition wall 13, and each of the element valves is provided in the partition wall 13. A tubular body 6 (valve seat member) is screwed into each of the through holes via an O-ring 12 to form a valve seat portion on the upper portion of the tubular body 6, and the valve body 3 facing the valve seat is planned. A spring 20 that is attached to the lower end of the jar 4 and urges the plunger 4 downward and a solenoid actuator 5 that drives the plunger 4 are provided in the upper drive mechanism. The above digital valve is generally provided with N (N ≧ 2) element valves, and the opening cross-sectional area ratio of the valve seat member of this element valve is equal to 2 ⁰ : 2 ¹ : 2 ² : 2N-1 and 2, etc. High-resolution flow rate control can be achieved by constructing a ratio sequence. Therefore, each element valve is ON-OFF controlled in which it is in a fully open or fully closed state without controlling the opening. That is, based on the digital signal from the controller that outputs a signal corresponding to the desired flow rate, the actuator of each element valve is ON-OFF driven to obtain the desired flow rate.

[0003]

[Problems to be solved by the device]

 In the digital valve thus configured, the hole of the cylinder body 6, that is, the opening cross-sectional area of the valve seat needs to be manufactured accurately and precisely, and this accuracy greatly affects the resolution of the digital valve. In order to solve this problem, it has been proposed to replaceably replace an orifice member precisely machined in a separate process in each cylindrical body 6 of each element valve. (Japanese Patent Laid-Open No. 3-33566) However, even in this case, since the cylindrical body 6 is fixed to the partition wall 13 by screwing, the screw is processed by aligning the axial center with the plunger 40 of the upper drive unit. The problem was that it was difficult. In addition, since the work of screwing the tubular body 6 into the partition wall 13 is actually a work of attaching it to a hard-to-see place in the inner part, a special jig is required and the work efficiency is extremely poor. On the contrary, the work of removing the cylindrical body or the orifice plate becomes more difficult. An object of the present invention is to solve the above problems, improve the workability and assembly of the digital valve, and provide a low-priced digital valve.

[0004]

[Means for Solving the Problems]

 Therefore, according to the present invention, an upstream liquid reservoir communicating with the inlet and a downstream liquid reservoir communicating with the outlet are horizontally arranged to face each other, and an upward flow passage communicating with the upstream liquid reservoir is provided. A valve body formed by opening a downward flow passage communicating with the downstream liquid pool at the upper part of the main body and a valve seat portion connecting the upward flow passage and the downward flow passage N (N ≧ 2) An element plate having an element valve of (1) is provided on the upper part of the valve body, and an n-th (2 ≦ n ≦ N) element valve is provided with a port which is 2n-1 times the minimum cross-sectional area of the flow path of the first element valve, A digital valve characterized in that it is provided by being sandwiched between a connection portion between one of the main body upper opening and the element valve, wherein the orifice plate has a downward flow passage opening and each element valve. It is desirable to sandwich it at the connection part with.

[0005]

[Action]

In the present invention, the opening cross section of the flow passage that determines the flow rate is formed by the port of the orifice plate provided at the connecting portion between the opening portion of the downward flow passage and the element valve to have the function. For example, of N (N ≧ 2) element valves, if the port cross-sectional area of the first orifice plate is 1, the valve seat cross-sectional area of the second element valve is neglected (however, at least both is larger than the orifice plate port.) and the port cross sectional area of the orifice plate and 2 ^1, and third valve members are also the port cross-sectional area of the orifice plate and 2 ^2, likewise N-th element The port cross section of the valve orifice plate is 2N-1. That is, the n-th (2≤n≤N) element valve is provided with an orifice plate having a port that is 2n-1 times the minimum cross-sectional area of the orifice flow path of the first element valve.

Therefore, only one model of each element valve including the valve seat portion, the valve element and the actuator portion is required, and the flow rate control can be solved by replacing each orifice plate. Further, the valve body may be formed by simply drilling the upstream and downstream liquid pools and the upward and downward flow paths, and the orifice plate port can be precisely processed in a separate process. Further, even if assembled, the workability is extremely good because the element valve is simply assembled by sandwiching the orifice plate in the downward flow passage opening of the valve body.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a digital valve having four element valves, showing only the first element valve 2a in cross section. FIG. 2 is a sectional view taken along the line AA of FIG. In the following description, there are four element valves 2a, 2b, 2c, 2d, but only the first element valve 2a will be described, and the same will be omitted hereinafter. The valve body 1 is a rectangular block made of metal, and an upstream liquid pool 8 communicating with the inflow port and a downstream liquid pool 9 communicating with the outflow port 11 are arranged horizontally as shown in FIG. An upward flow path 61, which is formed facing each other and communicates with the upstream liquid pool, and a downward flow path 62, which communicates with the downstream liquid pool, are formed in the upper part of the main body by opening. The element valve 2a in the upper part of the valve body has a flow passage 21 communicating with the upward flow passage 61 and a flow passage 22 communicating with the downward flow passage 62 therein, through the valve seat portion of the partition wall. Are connected.

The actuator drive unit is composed of the seat valve body unit 3 that abuts against the valve seat seat contact unit 41, the plunger 40, the solenoid 5, and the pressing spring 20 as in the conventional case. When assembling and connecting the valve body 1 and the element valve 2a described above, the orifice plate 30 is fitted through the gasket 31 into the step groove formed in the opening portion of the downward flow passage 62, and the element valve 2a is placed above the orifice plate 30. It is sandwiched via a sealing member and is connected and fixed to the valve body with a bolt member or the like. The port cross-sectional area of the orifice plate 30 is smaller than the opening cross-sectional area of the valve seat portion 33 of the element valve 2a, and the cross-sectional area corresponds to the minimum flow rate unit of the entire digital valve. Hereinafter, the port cross-sectional area of the orifice plate attached to the second element valve 2b is smaller than the cross-sectional area of the valve seat and is twice the port cross-sectional area of the orifice plate 30, and the third element valve 2c is also four times the same. The four-element valve 2d is eight times larger.

As another embodiment, the opening cross-sectional area of the valve seat portion can be directly configured as an orifice without providing the orifice plate of the first element valve. However, in this case, it is necessary to prepare two types of element valves, the second, third, and fourth element valves, which are the same as the first element valve below. Further, if the orifice plate is provided not at the opening of the downward flow passage but at the opening of the upward flow passage, the flow rate characteristic is slightly inferior, but the object of the present invention can be achieved.

[0010]

[Effect of the device]

 According to the present invention, machining of the valve body is simplified and facilitated, and machining and mounting of the orifice plate is facilitated. Moreover, since it is sufficient to prepare one model of each element valve, it is highly producible for mass production, and it is possible to provide an inexpensive digital valve as a whole.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a digital valve according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a vertical sectional view showing an example of a conventional digital valve.

[Explanation of symbols]

 1 Valve Main Body 2a First Element Valve 8 Upstream Liquid Reservoir 9 Downstream Liquid Reservoir 7 Port 33 Valve Seat 61 Upward Flow Path 62 Downward Flow Path 30 Orifice Plate

Claims (2)

[Scope of utility model registration request] 1. An upstream liquid reservoir communicating with the inlet and a downstream liquid reservoir communicating with the outlet are arranged laterally opposite to each other, and an upward flow passage communicating with the upstream liquid reservoir, and the downstream. N (N ≧ 2) N valves (N ≧ 2) for communicating and closing the valve main body formed by opening a downward flow passage communicating with the side liquid reservoir in the upper portion of the main body and the valve seat portion connecting the upward flow passage and the downward flow passage. An element valve is provided on the upper part of the valve body, and the n-th valve (2 ≦ n ≦
N) In the element valve, an orifice plate having a port that is 2n-1 times the minimum cross-sectional area of the flow path of the first element valve is provided at one of the openings at the upper part of the main body and the connection portion between the element valve. A digital valve characterized by being sandwiched. 2. The digital valve according to claim 1, wherein the orifice plate is provided so as to be sandwiched between a connecting portion between the opening of the downward flow passage and the element valve.