JPS62246664A - Unitized digital valve - Google Patents

Abstract

PURPOSE:To make it possible to cope with a required bit number and a capacity by making the cross-sectional areas of orifices of multiple element valves constituting a block digital value in a plural number-th position a certain geometric progression. CONSTITUTION:A 4-bit block digital valve includes four pieces of element values, with cross-sectional areas of orifice holes of respective valve seats 4a through 4d of the element valves making a geometric progression of 1, 2, 4 and 8. Then the cross-sefctional areas of orifice holes of a 2nd block digital valve make a geometric progression of 16, 32, 64 and 128. And those of an X-th orifice holes make a geometric progression of (4X-4)th power of 2, (4X-3)th power of 2, (4X-2)th power of 2, and (4X-1)th power of 2. Of these groupes of block digital valves, a plurality of block digital valves in serial positions are taken out, and arranged in parallel as a unit. With this constitution, it is made possible to obtain a unitized single unit having a required number of bits and a required delivery.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to unitization of a binary digital valve, which is a type of control valve used for fluid process control.

[Conventional technology]

The binary digital valve is described in the literature (magazine "Instrument" 1985
Year, Volume 28, &1 2, PP26-30 and “Piping Technology J 1986, N(11., PP156-15
As described in 9), it consists of a plurality of element valves (temporarily N), and these element valves operate fully open or fully open, and the cross-sectional area ratio of the orifice that defines the flow path of each element valve is But, 2°: 2”: 22:..., 2M-
It is 1. This is also called an N-bit digital valve.

The resolution of this digital valve increases as the number of bits N increases, and highly accurate reproducibility of the digital valve opening is an inherent property of the digital valve, regardless of the number of bits N.

By the way, in actual use of digital valves, there are cases where a high resolution with a bit number N of 12 to 16 is required, and cases where a low resolution with N of around 3 is sufficient for the purpose of utilizing only high precision reproducibility. Exist widely. In order to meet these wide demands for N, it is uneconomical to prepare digital valves with bit numbers ranging from large to small.

For this reason, when the number of bits in high demand, for example N, is set to ]O, it is common to design a device that can actually be manufactured up to 12 bits. For this reason, for digital valves with a bit number N of 3 to 4, unnecessary element valves should be installed with their positions closed, and for digital valves with a bit number N of 13 to 16, a new design should be made. This was an uneconomical method that had to be taken.

[Problem that the invention seeks to solve]

As mentioned above, with traditional digital valves.

It is difficult to meet a wide range of requests for the number of bits and is uneconomical, and furthermore, when using a digital valve in actual piping, if there is an excess or deficiency in the 8-dimensional function of the digital valve, another method with 8-dimensional precision that can be adapted is used. The drawback was that the valve had to be replaced.

An object of the present invention is to provide a unitized digital valve that can accommodate the required number of bits and capacity and can be delivered economically and quickly.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention creates a group of N-bit binary digital valves as block digital valves, and creates a group of N-bit binary digital valves that constitutes the first block digital valve.
The cross-sectional areas of the orifices of the element valves (or a considerable number of them) follow the geometric progression 2° 2 + , 22.・・・
2 N-1, and the second one is the geometric progression 2 N
, 2 N + 1゜2N″2... 22
As N -1, the Xth one is
Geometric progression 2(X-1)N.

2 (X-1)N+1,2(X-11N+z,...
,,2(X-1)MIN-11, from the group of these block digital valves, take out a plurality of consecutive block digital valves, arrange them in parallel, and integrate them to form this set. However, a single unit can be used as a digital valve with the necessary number of bits and the necessary capacity.

〔Example〕

1 and 2 show a 4-bit block digital valve showing one embodiment of the present invention, FIG. 1 being a longitudinal sectional view thereof, and FIG. 2 being a lateral sectional view thereof. In FIGS. 1 and 2, 22 is the main body. The main body 22 has connection ports 14 at both ends, communication ports 8 inside them, flow channels inside them, and an upper fluid chamber and a lower fluid chamber partitioned by a partition wall 7 in the center.

In FIG. 1, the connection port 14 on the left side, its communication path 8, the flow path 10 on the left side and the lower fluid chamber are in communication, and the two-part fluid chamber is in communication with those on the right side. Further, in FIG. 2, the left and right communication passages 8 penetrate in the vertical direction in the figure.

In FIG. 1, ] 1 is the lid of the main body 22 and the lid bolt 1
3 to the main body 22.

In FIG. 1, each of the four element valves is composed of a solenoid actuator 1, a plunger 2, a valve body 3 attached to the tip of the plunger 2, and a valve seat 5 having an orifice hole 4.

The solenoid actuator I, the plunger 2, and the valve body 3 attached to the plunger 2 are installed on the lid 11, and the valve seat having the orifice hole 4 is installed on the partition wall 7 of the main body 22. Each of the four element valves has its own valve seat 4a~
The cross-sectional area of the orifice hole 4d is a geometric progression 1, 2.4-.
8. Each element valve is normally in a closed state with the plunger 2 being pushed downward by the spring 6 and the valve body 3 being pressed against the valve seat 5. Solenoid actuator 1
When energized, the electromagnetic force overcomes the resistance of the spring 6, and the plunger 2 is opened in two parts. The opening degree of the block digital valve is determined by the combination of opening and closing of the element valves.

Next, the second block digital valve has the same structure as the first one described above, but the orifice hole 4
The cross-sectional area of the isopore number sequence 1.6, 32°64, ]28, and that of the Xth orifice hole 4 is 24x
-', 24x-'', 24x-''124 is -1.

Here, each block digital valve has a rectangular parallelepiped main body, and is arranged in parallel so that its communication passages 8 communicate with each other, and their contact surfaces have the same size and the inter-face dimension is constant.

FIG. 3 is a plan view in which three block digital valves shown in FIGS. 1 and 2 are assembled in parallel and integrated into a unit. In Figure 2, block digital valve 19A, same 1
9B and 19C are integrally connected with a connecting bolt 15 and communicate with each other through a communication path 8, and unnecessary connection ports 14 are closed with plugs 16. In addition, one end of the block digital valve has one of its communication paths 8 closed, or a block digital valve in the end is used as a communication path with only one side open from the beginning, as shown in FIG. The O-ring 17 is used to prevent internal fluid from leaking from the communication path 8 to the outside. The pipe 18 may be connected to any of the block digital valves 1.9A and 198.19 (7:).

In Fig. 2, the orifice cross-sectional area of the element valve of the block digital valve 19A is an isopore number sequence of 1°2.4.8;
9B is 16.32,64°128, and 1.9C is 25
6,5] 2,1024°2048, the unitized digital valve thus connected and integrated is equivalent to a 12-bit digital valve.

When you want to increase the valve capacity, for example, the orifice cross-sectional area of the element valve is equal to 4096°8192, +6.
384. This is achieved by adding block digital valve D (not shown) of :32768 and removing A. If you want to set the number of bits to a value that is not a multiple of 4, for example 0 bits, you can close the two unnecessary element valves or divide the large-diameter element valve to create the block digital valve C shown in Figure 2. The orifices are in sequence, 1.28, 128, 25
This can also be achieved by using 6,256 units and interlocking two units at the same time.

Figure 3 shows an example in which the communication path 8 is not provided and the connection is made to the header 21 via the joint 20, which is a method suitable for cases where a large number of block digital valves are combined or when the diameter of the pipe 22 is large. .

Figures 5 and 6 show block digital valves when the orifice cross-sectional area is increased, and the contact surfaces and dimensions between the surfaces of each block digital valve are constant, and among the dimensions of other surfaces, Figures 5 and 6 This is an example in which the vertical dimension in the figure is increased.

Figure 5 shows the orifices arranged in parallel.
FIG. 6 shows the arrangement of the large diameter orifice.

In the embodiments described above, a 4-bit block digital valve has been shown, but it goes without saying that 2-bit, 3-bit, or 5-bit valves can also be integrated or unitized using the same concept. In addition, it is practically possible to form units with combinations of different numbers of bits, such as 2 bits and 4 bits, or 3 bits and 6 bits. Furthermore, when changing the capacity of the unitized digital valve, the orifice cross-sectional area in the first block digital valve should be changed from equal hole number sequence 1°2.4.8 to 4.8, 16.32.
16.32, that of the second block digital valve to
It is also practical to sequentially shift the positions by two ranks from 64°128 to 64,128,256,512.

Regarding actuators, in the embodiments described above, solenoid actuators have been described as examples, but air cylinders, hydraulic cylinders, motor drives, shape memory alloys, P
It goes without saying that devices using piezoelectric materials such as ZT also fall within the scope of the present invention.

〔Effect of the invention〕

In the unitized digital valve according to the present invention, firstly, a unitized digital valve having the required number of pins can be easily obtained. In particular, it can easily handle everything from small-bit unitized digital valves of 3 to 4 bits to large-bit unitized digital valves of 14 to 16 bits. Second
If capacity is insufficient after piping is installed, the control valve can be easily modified to the optimal capacity by replacing, adding, or removing the block digital valve.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a 4-bit block digital valve that is an embodiment of the present invention, FIG. 2 is a cross-sectional view of the same 4-bit block digital valve as in FIG. 1, and FIG. Figure 2 is a partial cross-sectional view showing an example of unitizing the block digital valve, Figure 4 is a partial cross-sectional view of an example of unitizing the block digital valve and connecting it to a header, and Figure 5 is a partial cross-sectional view of an example of unitizing the block digital valve and connecting it to a header. FIG. 6 is a cross-sectional view of an example in which the capacity of the block digital valve is increased, and is a cross-sectional view showing another example of FIG. 5. 18-1d... Solenoid actuator, 2...
Plunger, 3... Valve body, 4a-4d... Orifice hole, 5a-5d... Valve seat, 6 River spring, 7.
・Partition wall, 8... Communication path, 9... Connection bolt through hole,
10... Channel, 11... Lid, 12... Seal,
13... Lid bolt, 14... Connection port, 15...
Connection bolt, 16... plug, 17... 0 ring,
1.8...Pipe, 19A-19C...Block digital valve, 20...Joint, 21...Header, Procedural amendment 61, 6.6 Showa year, month, day, 1988 patent application No. 89. t) Name of invention No. 3 Relationship with the case of the person who amended the unitized digital valve Patent applicant address 2-1-2 Marunouchi, Chiyoda-ku, Tokyo Subject of the amendment Contents of the amendment 1, Scope of claims in the specification Correct as follows. 1. An N-bit (N22) binary digital valve is defined as a block digital valve, and the block digital valve is a set of N element valves constituting the ix-th (X≧2) block digital valve. The cross-sectional area of the orifice is 6 rows 2 (X-υ
N, 2(X-1)Nsu7, 2(X-1
) NF2, 00. ,,． 2α-1) Wf(N-
A unitized digital valve characterized by Q. 2. The Detailed Description of the Invention column in the specification should be corrected as follows. (1) "Figure 2" on page 7, line 12 of the specification is corrected to "Figure 3." (2) In the same book, page 7, line 18, "in the end" is corrected to "for the end." (3) "Figure 3" in the second line of page 9 of the same book is corrected to "Figure 4." (4) Same book, page 9, line 5 [pipe 22]
Correct it with J. (5) On page 9, line 10 of the same book, ``Figures 5 and 6'' is corrected to ``Figures 1 and 2''. 3. Figures 1 and 2 of the drawings attached to the specification are corrected as shown in the attached sheet. That’s all 2.

Claims (1)

[Claims] 1. An N-bit (N≧2) binary digital valve is used as a block digital valve, and the block digital valves are assembled into a unit to form an X-th (X≧2) block digital valve. The cross-sectional area of the orifice of the N element valves is a geometric progression 2^(^X^-^1^)^N, 2
^(^X^-^1^)^N^+^1, 2^(^X^-^
1^)^N^+^2,..., 2^(^X^-^1^)^
A unitized digital valve characterized by being N^+^ (^N^-^1^). 2. The unit according to claim 1, wherein the outer shape of the main body of the block digital valve is substantially a rectangular parallelepiped, and the dimensions between the faces and the dimensions of the surfaces of the main bodies of the block digital valves that gather and contact each other are constant. digital valve. 3. The unitized digital valve according to claim 2, characterized in that a fluid communication passage connecting adjacent block digital valves is provided on a side surface of the block digital valve body.