JPS6037479A - Automatic temperature regulating valve - Google Patents

Abstract

PURPOSE:To regulate the rate of flow of a large scale by taking out the thermal expansion of wax as linear displacement and operating a plunger of a valve main body via incompressible fluid. CONSTITUTION:In correspondence to the temperature of fluie 5, the temperature of which is to be measured, surrounding heat sensing wax 43, the wsx 43 transforms from a solid phase into a liquid phase. When a diaphragm 42 is displaced by large thermal expansion of the wax 43 due to this phase transformation, the displacement of the diaphragm 42 is transmitted to incompressible fluid 44 via a hard rubber 49, a rod 48, and a plunger 47. And, owing to this fluid 44, a plunger 56 of a valve main body 21 is displaced, resisting a valve spring 61. This displacement of the plunger 56 displaces a valve rod 58 in order to regulate the flow rate of the fluid, the temperature of which is to be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is used to control the temperature of fluids such as engine cooling water and lubricating oil, heavy oil service tanks, supercharger air, boiler steam, and refrigerator Freon refrigerant. This invention relates to an automatic temperature control valve.

Figure 1 shows a conventional automatic temperature control valve, with temperature measuring part 1 and valve body 2.
It is composed of There is a temperature measurement tube 7 inside a protection tube 6 that is airtightly fixed in the vortex fluid to be measured in a flow pipe (not shown), and a liquid 8 such as kerosene, mercury, or fluorocarbon is sealed in the temperature measurement tube 7 as a temperature-sensitive material. has been done. When the temperature of the temperature-measuring fluid surrounding the protection tube 6 is transmitted to the temperature-measuring tube 7, a liquid 8 such as kerosene evaporates depending on the temperature of the temperature-measuring fluid, and the vapor pressure of this liquid 8 increases. is guided to the hollow case 12 of the valve body 2 through the flexible tube 9, the conduit 10, and the capillary tube 11. The steam pressure guided to the bellows gauge 12 of the valve body 2 acts on the bellows 13, displacing the bellows 13, displacing the valve stem 14 attached to the bellows 13 against the valve spring 15, and causing the valve to open. ] 6 to control the circulation of the fluid to be measured, thereby maintaining the temperature of the fluid to be measured at a constant temperature.

The conventional automatic temperature control valve described above has the following drawbacks.

Kerosene and water I used as temperature-sensitive material in temperature measuring part 1
+,! , because the vapor pressure of liquid 8 such as fluorocarbons is low,
1-The force that activates I3 is weak. Therefore, there is a big flow...
Problem 11 is applicable to large-diameter valves that control.

Furthermore, if the accuracy of the relationship between the salinity and vapor pressure of the liquid 8 such as kerosene is ill<<, the vapor pressure will vary greatly with respect to the measurement temperature. For this reason, the temperature adjustment is 1 degree worse, with an error of 20 degrees Celsius required.

In addition, when the protection tube [j is installed horizontally, the temperature measuring tube 7 is moved downward within the protection tube 6 by the flexible tube 9.
tl, the liquid 8 such as kerosene in the temperature measuring tube 7 will not flow into the conduit 10, but if it is attached upwards from the horizontal, the liquid 8 will flow into the conduit 10. Therefore, the ear R (=J' LJ) cannot be placed upward from the horizontal, and there are restrictions on the mounting orientation of the temperature measurement unit 1.

Also, due to the vapor pressure of the liquid 8, such as the bellows 13,
Therefore, a considerably large amount of liquid 8 is required to generate the required vapor pressure. Therefore, if the diameter of the temperature measuring tube 7 is made smaller, the length of the temperature measuring tube 7 will become longer.
Therefore, in the case of a small diameter flow pipe, the LJ must be installed vertically or horizontally at the bend of the flow pipe.
There are restrictions on the mounting location of the temperature measurement unit 1.

Furthermore, while the vapor of the liquid 8 such as kerosene is being led to the bellows 13, its state is likely to change depending on the surrounding atmosphere. Therefore, the length of the capillary tube 11 that guides the steam from the temperature measurement section 1 to the valve body 2 cannot be made long, and therefore the temperature measurement section 1 and the valve body 2 cannot be installed together.

In order to make the capillary tube 11 long, it is necessary to make the capillary tube 11 long so that the state of the steam does not change depending on the surrounding atmosphere.
This poses a problem, as appropriate protective measures must be taken to ensure that the

Moreover, the overall size is large, the structure is complicated, and the cost is high.

The present invention solves the above drawback 1-, and can provide a large-diameter automatic temperature control valve that can control a large amount of leakage. Attached posture, 11
[i] There is no restriction on the diameter of the flow pipe, and since the connecting pipe between the valve body and the temperature measuring part can be long, both can be installed remotely, and it is small and has a simple structure, with a low 1st I. The structure is characterized by a wax that expands in response to the salinity of the surrounding paleofluid, which displaces the diaphragm,
The displacement generated in this diaphragm is transmitted to the plunger of the first cylinder filled with incompressible fluid, and due to the displacement of this plunger, the first cylinder is communicated with the connecting pipe and the incompressible fluid is created between the first cylinder and the first cylinder. A plunger of a second cylinder filled with fluid is displaced against a valve spring, and the displacement of the plunger displaces the valve through the valve stem.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Illustrated embodiments of the invention will be described below.

FIG. 2 shows an automatic temperature control valve according to the present invention, with the measuring part 20
and a valve body 21. Flow pipe 4 for temperature measured fluid 5
A holding cylinder 23 that protrudes into the flow pipe 4 and is airtightly fixed by a fitting 22 fixed to the holding cylinder 23 has a guide cylinder 24 that is screwed into and fixed to the distal end of the holding cylinder 23 . The holding cylinder 23 is the guide cylinder 24
The center hole 25 has a diameter that is almost the same as the inner diameter of the first cylinder 26, and the upper half thereof has a slightly larger diameter, and the lower end threaded portion 27 of the first cylinder 26 is located here.
is screwed into place. Enlarged holes 28 and 29 are provided in two stages at the upper end of the holding cylinder 23, and the cylinder 2 is inserted into the hole 28.
6 is accommodated, and a cap nut 31 is screwed into the upper threaded portion 32 of the cylinder 26 in the hole 29, thereby sealing one end of the cylinder 26.

A protective tube 34 is screwed into a threaded portion 33 protruding from the cap nut 31, and a 1f hole is inserted through the cap nut 31 as a connecting tube to communicate the first cylinder 26 and a second cylinder 51, which will be described later.
The fl soldered capillary tube 35 (3fi is a flexible tube that covers the capillary tube 35) is penetrated and brazed to a cap nut 52 screwed into a second cylinder 51 of the valve body 21, which will be described later.

A diaphragm 42 is sandwiched between the tip flange 39 of the guide tube 24 and the end surface 41 of the stepped opening of the capsule 40, and the capsule 40 is tightly wound and fixed to the flange 39. Copper powder with good thermal conductivity is contained in the capsule 40. It is filled with wax 43 mixed with metal powder such as.

The wax 43 generally has a thermal expansion property that allows it to produce a large linear displacement in the phase transition temperature range between the solid phase and the liquid phase. Use a wax that falls within the transition temperature range.

The first cylinder 26 and capillary tube 35 are filled with an incompressible fluid 44 such as kerosene, mercury, or fluorocarbon, and the cylinder 26 is sealed with a plunger 47 equipped with an O-ring 45 and a Huck anopring 46. Ru. A rod 48 and hard rubber 49 are interposed between the plunger 47 and the diaphragm 42.

Therefore, when the diaphragm 42 is deformed due to thermal expansion of the wax 43, this deformation is transmitted to the plunger 47 via the hard rubber 49 for protecting the diaphragm and the rod 48, displacing the incompressible fluid 44.

On the other hand, the valve body 21 has a narrow diameter portion 5 at the negative end of the valve body 21.
A second cylinder 51 having the same structure as the cylinder 26 of the temperature measuring section 20 is fixed inside the temperature measuring section 20, and a cap nut 52 and a protective tube are attached to the upper end of the cylinder 51 in the same way as the temperature measuring section 20. 53 is attached, and the capillary tube 35 from the temperature measuring section 20 is penetrated and soldered to this cap nut 52. The second cylinder 51 is also sealed with a plunger 56 equipped with an O-ring 54 and a hack-up ring 55, and is filled with an incompressible fluid 44.

Therefore, the displacement of the plunger 47 of the temperature measuring section 20 is transmitted to the plunger 56 of the valve body 21 via the incompressible fluid 44.

A valve rod 58 having a valve 57 at its tip extends from the lower surface of the plunger 56 and passes through the inside of the valve body 21 .

Further, a valve spring 61 for biasing the plunger 56 is installed in the valve body 21 between a spring presser plate 59 fixed to one end of the valve stem 58 and an opposing fixed spring seat 60.

Reference numeral 62 denotes a zero point adjustment screw, which expands and contracts the valve stem 58 to displace the position of the valve 57 and adjust the zero point of the temperature. Reference numeral 63 indicates a temperature zero point indicating scale, and reference numeral 64 indicates an indicator needle attached to the valve stem 58. Although the valve body 21 is shown as a two-way valve that adjusts fluid drainage at the outlet, it can of course also be a one-way valve, in which case the total flow area is constant at all positions of the valve.

Next, the effect will be explained.

The wax 43 changes from a solid phase to a liquid phase depending on the quality of the temperature-measuring fluid 5 surrounding the heat-sensitive wax 43.

Due to the large thermal expansion of the wax 43 due to this phase change,
When the diaphragm 42 is displaced, the other diaphragm 42
The displacement of hard rubber 49, rod 4B, and plunger 4
7 to the incompressible fluid 44, and this incompressible fluid causes the plunger 56 of the valve body 21 to be displaced against the valve spring 61. This displacement of the plunger 56 displaces the valve stem 58, and the opening degree of the valve 57 at the tip is adjusted, thereby controlling the flow rate of the temperature-measuring fluid, thereby maintaining the temperature-measuring fluid 5 at a constant temperature.

Therefore, the present invention has the following effects.

Wax is used as a temperature-sensitive material in the crystal measuring part, and the large thermal expansion in the phase transition temperature range between the solid phase and liquid phase is extracted as a linear displacement, and the plunger of the valve body is moved through the incompressible fluid to N. Because of this, the plunger can be moved with a large force (3 to 5 times that of conventional valves) due to the large thermal expansion force of the wax from the solid phase to the liquid phase. You can move a valve of 1 yen,
An automatic temperature regulating valve capable of controlling large flow rates can be obtained.

In addition, since the relationship between the temperature of the wax and the amount of thermal expansion between the solid phase and the liquid phase is highly accurate, there is little variation in the thermal expansion with respect to the measurement temperature, and therefore there is little error (compared to the conventional 1
15 to 1/4) Enables temperature adjustment.

Further, since the wax is blocked by a diaphragm, there is no problem even if the temperature measuring section is attached to the flow pipe with the wax facing upward, and there are no restrictions on the spraying position of the temperature measuring section.

Furthermore, since a wax that transitions from a solid phase to a liquid phase is used, even a small amount of wax generates a large expansion force. For this reason,
The capsule filled with wax is compact, so the insertion part of the temperature measurement part into the flow pipe can be short. Therefore, it can be installed in a small-diameter flow pipe without any problems, and there are no restrictions on the diameter of the /If, 1ffi pipe or the installation location.

In addition, since the linear displacement due to wax expansion is transmitted to the plunger of the valve body using an incompressible fluid, the connecting pipe filled with incompressible fluid between the temperature measuring part and the valve body is lengthened. However, it does not cause any problems and is not affected by the surrounding atmosphere. Therefore, the temperature measuring section and the valve body can be installed remotely by lengthening the connecting pipe.

Moreover, the overall size can be made small, the structure is simple, and the cost is low.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional example, and FIG. 2 is a sectional view showing an embodiment of the present invention. 4... Flow pipe, 5... Fluid to be measured, 20... Temperature measuring section, 21... Valve body, 23... Holding cylinder, 24
...Guide tube, 26...First cylinder, 31.5
2... Bag nut, 34.53... Protection tube, 35.
...Capillary tube, 36...Serpentine tube, 40...Capsule, 42...Diaphragm, 43...Wax,
44... Incompressible fluid, 47.56... Plunger, 48... Rod, 49... Hard rubber, 51...
・Second cylinder, 57...valve, 58...valve stem,
61... Valve spring, 62... Zero point adjustment screw. Agent Patent Attorney Ken Okabe −

Claims (1)

[Claims] A diaphragm is displaced by a wax that expands in response to the temperature of the surrounding hot fluid, and the displacement caused in the diaphragm is transmitted to a plunger of a first cylinder filled with an incompressible fluid, and the displacement of this plunger causes A plunger of a second cylinder communicated with the first cylinder through a connecting pipe and filled with an incompressible fluid between the first cylinder and the first cylinder is displaced against a valve spring, and the displacement of the plunger causes a flow of air to flow through the valve stem. An automatic temperature control valve characterized by displacing the valve.