JPH0410594B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wax element used to transmit a temperature detection signal of fluid such as cooling water or lubricating oil of a marine diesel engine or refrigerator to an air pressure converter for automatic temperature adjustment. This invention relates to a type remote temperature detection transmission device.

Figure 1 shows a conventional device that utilizes the thermal expansion of kerosene, in which a protection tube 1 of the temperature measuring section is hermetically fixed in the fluid to be measured using a mounting bracket 2, and kerosene is used as a temperature-sensitive material inside the protection tube 1. A temperature measuring tube 3 filled with a thermal expansion liquid such as mercury or mercury is fixed, and linear displacement due to volumetric expansion of the thermal expansion liquid is guided to a temperature adjustment section 6 via a conduit 4 and a capillary corrugated tube 5. 7 is a gland packing, and 8 is a screw plug. In the temperature control section 6, the expansion of the thermal expansion liquid introduced through the capillary flexible tube 5 is converted into displacement by the Bourdon tube, and the air pressure sent from the tube 9 is controlled by the displacement, and the air pressure is controlled from the tube 10 to the thermal expansion liquid. It sends out the corresponding air pressure signal. The air signal is used to adjust the opening of a valve (not shown) to control the flow rate of the temperature-measuring fluid, thereby maintaining the temperature-measuring fluid at a constant temperature. 11 is an indicating thermometer.

However, the amount of linear expansion due to volumetric thermal expansion of kerosene and mercury is as low as about 1 mm for a temperature change of 100°C, so conventional equipment requires a Bourdon tube with a complicated structure, which is disadvantageous in terms of cost and maintenance. . On the other hand, since it is often difficult to adjust the automatic temperature regulator of the fluid in a narrow space such as a ship, the automatic temperature regulator is provided at a position away from the temperature measuring section.

Therefore, the object of the present invention is to use wax as the temperature-sensitive material of the temperature measuring part, extract the large thermal expansion in the phase transition temperature range between the solid phase and the liquid phase as a linear displacement, and connect this displacement. It is an object of the present invention to provide a wax element type remote temperature detection and transmission device capable of transmitting a pneumatic signal to an automatic temperature control section through an incompressible filling liquid in a pipe and generating a pneumatic signal without using a Bourdon tube or bellows.

In the present invention, one side of a capsule filled with wax as a temperature-sensitive material is closed with a diaphragm, and the displacement of the diaphragm that occurs in response to the temperature of the surrounding fluid to be measured is transferred to a first cylinder filled with an incompressible fluid. The displacement of the plunger is transmitted to the plunger of the second cylinder of the pneumatic converting section, which communicates with the cylinder through a connecting pipe and is filled with the incompressible fluid together with the connecting pipe, and the displacement of the pneumatic converting section is transmitted to the plunger. It is characterized by being activated.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Illustrated embodiments of the invention will be described below. FIG. 2 shows a temperature measuring section, in which a mounting fitting 13 is fixed to a flow pipe 12 for the temperature-measured fluid, and a flange 15 of a holding cylinder 14 is bolted to this. The holding cylinder 14 protrudes into the flow pipe 12, and a guide cylinder 16 is screwed and fixed to the tip thereof. The holding cylinder 14 has a center hole 17 having approximately the same diameter as the inner diameter of the guide cylinder 16, with a lower half having a slightly larger diameter, and a threaded portion 19 of the first cylinder 18 inserted therein.
Screw and secure. Enlarged holes 20 and 21 are provided in two stages at the lower end of the holding cylinder 14, and the cylinder 1 is inserted into the hole 20.
The screw-in collar 22 of No. 8 is accommodated, and the hole 21 is
Inside, the cap nut 23 is screwed into the lower end threaded portion 24 of the cylinder 18 to seal the lower end of the cylinder 18. A protective tube 26 is screwed into a threaded portion 25 protruding from the cap nut 23, and a capillary tube 27 soldered through the cap nut 23 is connected to a capillary tube 50 of an automatic temperature control section to be described later by a capillary flexible tube 28.

Outer end flange 29 of guide tube 16 and capsule 30
The diaphragm 32 is sandwiched between the diaphragm 32 and the flange 29, and the capsule 30 is wound and fixed to the flange 29, and the capsule 30 is filled with wax 33 mixed with metal powder such as copper powder, which has good thermal conductivity. Constitutes a warm wax element. Wax generally has such a large thermal expansion property that it causes a linear displacement of 10 mm for a temperature change of 10°C in the range of phase transition temperature between solid phase and liquid phase. It is assumed that a wax is used in which the control temperature of the hot fluid falls within the range of the phase transition temperature.

The cylinder 18, the capillary tube 27, and the capillary flexible tube 28 are filled with an incompressible fluid 34 such as kerosene or mercury, and the cylinder 18 is sealed by a plunger 35. 36 and 37 are O-rings and back-up springs.

When the diaphragm 32 deforms due to the thermal expansion of the wax 33, this deformation is transmitted to the plunger 35 via the hard rubber 38 and rod 39 for protecting the diaphragm, causing the incompressible fluid 34 to undergo a displacement approximately equal to that of the wax 33. give.

Figure 3 shows the automatic temperature control section, and the wall mounting bracket 4
A nozzle flapper type pneumatic converter 42 is fixed to a wall using a bolt 41 and a bolt 41, and the upper end of a support cylinder 45 is screwed into a fixing fitting 44 fixed to the converter 42 with a bolt 43. Lower semi-thin diameter portion 46 of support tube 45
A second cylinder 47 having the same structure as the first cylinder 18 is fixed therein, and a capillary tube is attached to the lower end of the cylinder 47 with a cap nut 48 and a threaded part 49 in the same manner as in the first cylinder 18. 50 and connect the capillary tube 50 to the capillary flexible tube 28.
Connect to.

The second cylinder 47 is also sealed by the plunger 51 and filled with an incompressible fluid 34 , and the displacement of the plunger 35 is transmitted to the plunger 51 via the incompressible fluid 34 .

A pair of spring receivers 53 vertically spaced apart by a spring 52 are fitted into the support tube 45, and the lower spring receiver 53
is brought into pressure contact with the upper end of the plunger 51 via the washer 54, and the lower end of the rack 55 which passes through both the upper and lower spring receivers 53 and projects from the pneumatic pressure converter 42 is brought into contact with the plunger 51 through the washer 54. Therefore, the displacement of the plunger 51 is easily 5
A mechanism within the pneumatic pressure converter 42 is actuated via the nozzle 56, thereby controlling the temperature of the fluid to be measured using the pneumatic signal generated from the nozzle 56.

The pneumatic transducer 42 was filed in a patent application filed in 1983 by the present applicant.
140307 (see Japanese Unexamined Patent Publication No. 140307), but since it is not directly related to the present invention, detailed explanation will be omitted.

As described above, the present invention utilizes the large thermal expansion property of wax in the phase change temperature range to convert the temperature of the fluid to be measured into a mechanical displacement, and then converts this displacement into a mechanical displacement generated by a cylinder and a plunger. Since the flow displacement of the compressible fluid is transmitted to the pneumatic transducer at a remote point, the amount of transmitted displacement is large, and it is possible to generate a pneumatic signal with high precision without using a Bourdon tube or bellows in the pneumatic transducer. In addition, it has the effect of easily causing a large flow displacement in the incompressible fluid even under high pressure, and the automatic temperature adjustment section is provided at a location away from the engine etc. to facilitate adjustment. I can do it.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of a conventional device showing a temperature measuring section in longitudinal section, Fig. 2 is a longitudinal sectional view of a temperature measuring section according to an embodiment of the present invention, and Fig. 3 is a schematic diagram of the automatic temperature control section. FIG. 18...first cylinder, 28...connecting pipe, 30...
Capsule, 32...Diaphragm, 34...Incompressible fluid, 35...Plunger, 47...Second cylinder, 51...Plunger.

Claims (1)

[Claims] 1 Transmit the displacement generated in the diaphragm that closes one side of the wax-filled capsule in response to the temperature of the surrounding fluid to be measured to the plunger of the first cylinder filled with the incompressible fluid, and transmit the displacement of the plunger to the first cylinder. The air pressure is transmitted to a plunger of a second cylinder of the pneumatic converting unit which communicates with the cylinder through a connecting pipe and is filled with the incompressible fluid together with the connecting pipe, and operates the pneumatic converting unit by displacement of the plunger. Wax element type remote temperature detection transmission device.