JPH01312287A - Automatic temp. control valve - Google Patents

Abstract

PURPOSE:To have an automatic temp. control valve having quicker response than a conventional one driven through comparation of an aimed value with an actual measurement value by providing a set temp. control means utilizing a temp. response member such as bimetal and a computer. CONSTITUTION:A valve body 14 is operated by a temp. responsive member 24 such as bimetal stored in a valve chamber 3 such that fluid of which temp. is below a set temp. is discharged through a valve port 8. A temp. control means 16 for controlling this set temp. is coupled to the temperature respensive member 24. A drive means for driving this means 16 is controlled by a computer so that a desired fluid pressure and set temp. can be obtained.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a valve for controlling the temperature of a fluid, and the present invention relates to a valve for controlling the temperature of a fluid, and the present invention relates to a valve that controls the temperature of a fluid, and automatically drains fluid below a set temperature to the outside of the system so as to maintain the downstream side at a desired temperature. Regarding a temperature control valve for discharging air.

<Prior Art> Conventionally, automatic control valves have been used in such cases. Automatic control valves detect the controlled variable of the controlled object, compare it with the target value, make judgments based on deviations, and process commands in the form of signals to control operating parts such as electric motors and fluid actuators that operate the valve body. It is.

When used as a temperature control valve, the temperature on the primary side is detected by a temperature sensor, compared with a manually set target value through a setting mechanism, processed as a signal, and controlled by an actuator such as an electric motor to produce proportional, differential, Integral action, so-called P-I-
Perform D control.

<Problem to be solved by the invention> However, when performing P-I-D control as described in (a) above, it is difficult to determine the respective constants of P, I, and D to determine the amount of valve operation. This requires a high level of skill and experience. Furthermore, in this control method, the valve is operated while comparing the actual measured value so that it approaches the target value, so the response is very poor, and it takes a long time to reach the set temperature, or the temperature goes too far.

Furthermore, the automatic control valve described above is expensive. This is because the valve body must be operated directly and rapidly in small increments using an actuator such as an electric motor, which requires a high-output actuator and control equipment that performs compound signal processing.

Therefore, the technical problem of the present invention is to provide a temperature control valve that is quick in response and inexpensive using a simple control method.

<Means for Solving the Problems> The technical means of the present invention taken to solve the above problems is to form an inlet, a valve chamber, and an outlet in a valve casing, and to provide a valve port that communicates the valve chamber and the outlet. A temperature-responsive member such as a bimetal is housed in the valve chamber, and the valve means operates according to the surrounding fluid temperature, so that fluid below a set temperature passes through the valve port. a temperature-responsive member operatively connected to the valve means for discharging to an outlet; and a temperature-responsive member operably connected to the temperature-responsive member so as to adjust the set temperature. A driving means for driving the temperature adjusting means is attached, and the relationship between the fluid pressure and set temperature and the adjustment amount of the temperature adjusting means is stored in a computer equipped with a setting input means, and the desired fluid pressure and setting are inputted from the setting input means. When the temperature is input, the computer calculates the optimum adjustment amount for the temperature adjusting means, and the calculated adjustment amount drives the driving means.

Effect〉 The operation of the above technical means is as follows.

In the valve portion of the temperature control valve, a temperature-responsive member such as a bimetal built into the valve chamber expands and contracts depending on the temperature of the surrounding fluid, and the connected valve means opens and closes the valve port to discharge the fluid. For example, if a temperature-responsive member is configured to expand at high temperatures and contract at low temperatures, when the surrounding temperature drops, it will contract and open the valve opening, and at the same time, high-temperature fluid will flow into the valve chamber. It extends and closes the valve port, which is done continuously to maintain a constant fluid temperature.

The temperature at which the fluid is discharged can be arbitrarily determined by varying the pressing force of the temperature-responsive member toward the valve opening using the temperature adjusting means. In other words, there is a linear relationship between the set temperature and the adjustment amount of the temperature adjustment means.

On the other hand, the storage device in the computer stores the aforementioned fluid pressure, set temperature, and adjustment amount of the temperature adjustment means.
When the working fluid pressure and desired set temperature are inputted from the setting input means, an arithmetic unit in the computer calculates the optimum adjustment amount of the temperature adjusting means from the above relationship. A control signal based on the calculated adjustment amount is sent to the drive section to operate it, and the temperature adjustment means moves to a desired value and then stops. In order to move the drive means by the calculated adjustment amount and then stop the drive means, position detection means such as a potentiometer is used, or position control is performed using a stepping motor.

<Effect of the invention> The present invention produces the following unique effects.

The temperature control valve of the present invention is easy to control because there is no need to determine the constants of P, I, and D, and the control method does not involve operating the drive unit while comparing target values and actual values.
Since the drive unit is operated by the necessary amount all at once toward the target value, control with quick response is possible.

Further, once the initial setting is completed, the drive section does not have a chance to operate until the set temperature is changed next time, and the operation time is short, so the lifespan is much longer than that of an automatic control valve.

<Example> An example showing a specific example of the above technical means will be described. (
(See FIGS. 1 to 3) A lid member 2 is coupled to a main body 1 with bolts and nuts to form a valve casing having a valve chamber 3 therein.

A gasket 4 is interposed between the main body 1 and the lid member 2 to maintain airtightness. An inlet 5 communicates with the valve chamber 3 through a through hole 6, and an outlet lower communicates with the valve chamber 3 through a valve port 8. The valve port 8 is formed in a valve seat member 10 that is threadedly connected to the main body 1.

A gasket 11 is interposed between the main body 1 and the valve seat member 10 to maintain airtightness.

A screen 12 is arranged to regulate the flow direction of fluid flowing into the valve chamber 3 from the inlet 5 and to trap foreign matter in the fluid.

A connecting rod 13 is arranged opposite the valve port 8. A valve body portion 14 is integrally formed at the lower end of the connecting rod 13 . The upper end of the connecting rod 13 is displaceably fitted into a connecting rod fitting hole 17 of an adjusting rod 16 screwed to the lid member 2 so that it can be moved back and forth. The connecting rod fitting hole 17 is formed on the same axis as the valve port 8. Gaskets 15a and 15b provide airtightness between the lid member 2 and the adjustment rod 16.

The member 18 is used to tighten (pull and hold) with C interposed.

A snap ring 21 is attached to the center of the connecting rod 13 to serve as a spring holder. An intermediate member 23 having a cross-section shaped like a 0-shape and having a center hole and a flange 22 on the outside of the upper end is connected to the connecting rod 1 with the center hole.
3, the snap ring 21 is movably brought into contact with the lower end surface of the snap ring 21 and fitted.

Around the connecting rod 13, the lower end surface of the adjusting rod 16 and the intermediate member 2
A bimetal laminate 24 and a flat washer 25 are placed between the flange 22 of 3.
Place. The bimetal laminate 24 is a pair of bimetal disks 26 combined with different curved directions,
This is a stack of multiple pairs. A spacer 27 is interposed between each bimetal pair.

Inside the intermediate member 23, the snap ring 21 is inserted between the upper end surface of the snap ring 21 and the lower end surface of the flat washer 25 at the valve port 8.
A valve body biasing spring 29 is arranged to bias the valve body in the direction. A return spring 30 is disposed between the lower end surface of the flange 22 of the intermediate member 23 and the bottom wall of the valve chamber 3. In addition, reference number @31 is an erosion prevention member.

The fluid enters the valve chamber 3 from the inlet 5 through the through hole 6 and the screen 12, flows around the bimetal laminate 24, and flows out from the valve port 8 to the outlet lower. When the temperature of the surrounding fluid rises and the bimetal laminate 24 is heated to a high temperature, each bimetal disc 26 curves to a greater degree. 30
While compressing, it expands in the stacking direction. Accordingly, the intermediate member 23 and the connecting rod 13 are displaced in the direction of the valve port 8, the opening degree of the valve port 8 gradually becomes smaller, and finally the valve body portion 14 closes the valve port 8. This valve closed state is shown in FIG.

When the temperature of the fluid in the valve chamber 3 decreases, the bimetal laminate 2
4 is pushed back via the intermediate member 23 by the return spring 30 because the bending force becomes smaller. Along with this, the intermediate member 2
3 and the connecting rod 13 are displaced in a direction away from the valve port 8, the valve port 8 is opened, and the fluid in the valve chamber 3 flows out to the outlet lower again.

In this way, fluid below the set temperature is automatically drained.

The set temperature can be adjusted by moving the adjustment rod 16 forward and backward. That is, if the adjusting rod 16 is screwed in, the set temperature (temperature of the fluid to be discharged) will be lowered, and if it is screwed up, the set temperature will be raised. This has a linear relationship as shown in Figure 3, and once the working fluid pressure and set temperature are determined, the adjustment amount of the adjustment rod is determined according to the figure.

On the other hand, in the driving section, the upper flange 35 of the lid member 2 and the flange 36 of the actuator section 37 are attached with bolts and nuts via a heat insulating material 38. The actuator section 37 is a motor 39. It consists of a potentiometer 40, a reducer 41, and electronic parts for driving a motor (not shown).

The output shaft 42 of the speed reducer 41 is spline connected to the adjustment rod 6. In this spline fitting part, rollers 43a and 43b are provided on a roller shaft passing through the output shaft 42 in the radial direction, and the upper part of the adjustment rod 16 is formed into a cylindrical shape, and a groove 44 is formed in the axial direction in the cylindrical part. The rollers 43a and 43b are fitted into the grooves. Therefore, when the output shaft rotates left and right, the rollers 43a and 43b engage with the groove 44 to transmit the rotation to the adjustment rod 16. The adjustment rod 16 is displaced in the axial direction due to the screw connection with the lid member 2, but the displacement is absorbed by sliding in the groove 44. Part numbers 45 and 46 are thrust bearings.

The computer in the controller 47 has the following information as shown in FIG.
The relationship between the fluid pressure and set temperature and the adjustment amount of the adjustment rod 16 is stored. Therefore, when the fluid pressure and set temperature are input from the setting input device 48, the adjustment amount of the adjustment rod 16 is calculated in the controller 47 from the relationship shown in FIG. 3 stored above.

The motor 39 is driven by a control signal based on the calculated adjustment amount. The displacement of the adjustment rod 16 is detected by the potentiometer 40, and if this signal matches the calculated control signal, the motor 39 is stopped.

If even more precise control is required, the temperature inside the valve 3 should be detected with a temperature sensor and constantly compared with the target value, and if a deviation occurs, it should be determined according to the relationship shown in Figure 3. It is possible to perform a correction operation by recalculating the adjustment amount of the adjustment rod.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of an embodiment of the temperature control valve of the present invention, and FIG. 3 is a diagram showing the relationship between the pressure and set temperature of the temperature control valve and the adjustment m of the control rod. 1: Main body 2: M member 3: Valve 5: Lower part: Outlet 8: Valve port 10: Valve seat member 13: Connecting rod 14: Valve body part
16: Adjustment rod 24: Bimetal laminate 37: Actuator section 39: Motor 42: Output shaft

Claims (1)

[Claims] 1. An inlet, a valve chamber, and an outlet are formed in the valve casing, a valve port is provided to communicate the valve chamber and the outlet, a valve means is arranged to open and close the valve port, and a temperature-responsive member such as a bimetal is installed in the valve chamber. a temperature-responsive member operatively connected to the valve means to operate in response to the ambient fluid temperature thereof and to discharge fluid below the set temperature to the outlet through the valve port to adjust said set temperature; A temperature control valve operatively connecting a temperature control means to the temperature responsive member is provided with a drive means for driving the temperature control means, and a drive means for driving the temperature control means is installed to control the adjustment amount of the temperature control means between the fluid pressure and the set temperature. By storing the relationship in a computer equipped with a setting input means, and inputting the desired fluid pressure and set temperature from the setting input means, the computer calculates the optimum adjustment amount of the temperature adjustment means, and the calculated adjustment amount is calculated by the computer. 1. An automatic temperature control valve characterized in that the driving means is driven by a certain amount.