JPS59105530A - Wax element type remote temperature detection transmission gear - Google Patents

Abstract

PURPOSE:To enable the generation of air pressure signal at a high accuracy by transmitting a displacement generated in a first diaphragm to a second diaphragm having one surface closed of a second capsule filled with a non-compressible material through a plunger. CONSTITUTION:A capsule 20 is securely wound and clamped on an outer end flange 19 of an upper guide cylinder 16 sandwitching a first diaphragm 22 between the flange 19 and a step end face 21 thereof 20 and is filled with a wax mixed with a heat conductive metal powder such as steel powder to form a humidity sensitive wax element. A second diaphragm 24 and a second capsule 25 are fastened on a lower guide cylinder 18 and the capsule 25 and a capillary tube 26 connected thereto are filled with a non-compressible fluid 28. Thus, an air pressure signal can be generated at a high accuracy by transmitting a displacement generated in the first diaphragm to the second diaphragm.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wax element type device used for transmitting temperature detection signals of fluids such as cooling water and lubricating oil in marine diesel engines, refrigerators, etc. to an air pressure converter for automatic temperature adjustment. The present invention relates to a remote temperature detection transmission device.

Figure 1 shows a conventional device that utilizes the thermal expansion of kerosene.
The protection tube 1 of the temperature measurement section is hermetically fixed in the fluid to be measured using the mounting bracket 2, and the temperature measurement tube 3 containing kerosene as a temperature-sensitive material is fixed inside the protection tube 1, and the linear displacement due to the volumetric expansion of the kerosene is fixed. is guided to the temperature control section 6 via the conduit 4 and the capillary serpentine tube 5. 7 is a ground plug, and 8 is a tap.

In the temperature control section 6, the expansion of the kerosene 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 based on the displacement, so that the tube 1
0 to send out an air pressure signal according to the thermal expansion. The air pressure 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 the indicating temperature needle.

However, the amount of linear expansion due to volumetric thermal expansion of kerosene is as low as about 1 mL 11 for a temperature change of 100° C. Therefore, a Bourdon tube with a complicated structure is required, which is disadvantageous in terms of cost and maintenance. - Since it is often difficult to adjust the automatic temperature controller for the fluid in a narrow ship or the like, the automatic temperature controller is installed at a location 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 a filling liquid in a tube and generating a pneumatic signal without using a Bourdon tube or bellows.

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

FIG. 2 shows the temperature measuring section, in which the flange 15 of the holding cylinder 14 is bolted to the mounting bracket 13 fixed to the flow pipe 12 of the temperature-measured fluid, and the tip of the holding cylinder 14 protruding into the flow pipe 12 is attached. The upper guide cylinder 16 is screwed and fixed to the holding tube 14, and the upper end of the lower guide cylinder 18 is screwed and fixed to the intermediate threaded part 17 of the holding tube 14. The first diaphragm 22 is sandwiched between the outer end flange 19 of the upper guide tube 16 and the stepped end surface 21 of the first capsule 20, and the capsule 20 is tightly wound and fixed around the flange 19. A temperature-sensitive wax element is constructed by filling wax 23 mixed with good quality metal powder such as copper powder. The second diaphragm 24 and the second capsule 25 are fixed to the lower guide tube 18 in the same manner as above, and the capsule 2
5, a capillary tube 26 and a capillary flexible tube 27 connected thereto are filled with an incompressible fluid 28 such as kerosene. A plunger 29 whose both ends are in sliding contact is provided in the upper and lower guide tubes 16.degree. 18, and the ends and the diaphragm 22. Hard rubber 30.30 to prevent damage to the diaphragm between '24 and
Charge. 31 is an O-ring.

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 phase transition temperature range between solid phase and liquid phase. A wax whose control temperature falls within the phase transition temperature range is used.

With the above structure, the volumetric thermal expansion of the wax 23 displaces the diaphragm 22, and this displacement displaces the diaphragm 24 via the hard rubber 30, 30 and the plunger 29, causing the incompressible fluid 28 to have approximately the same amount of displacement as the wax 23. give.

FIG. 3 shows the automatic temperature control section, and the outer cylinder 3 is attached to the mounting bracket 32.
The flange 34 of No. 3 is fixed with bolts, and the nozzle flapper type pneumatic converter 36 is fixed to the upper end of the support cylinder 35 which is threadedly connected to the upper end of the outer cylinder 33. The guide tube 38 is screwed into the lower narrow diameter part 37 of the outer tube 33, and the third capsule 39 and the third diaphragm 40 are fixed to the lower end of the guide tube 38 in the same way as in the capsule 25. The incompressible fluid 28 is filled into these connecting tubes and the capsule 39 by connecting to the capillary serpentine tube 26 through the capillary tube 26 .

A plunger 42 whose lower part slides inside the guide cylinder 38 inside the outer cylinder 33 , a spacer tube 43 whose upper end is screwed and fixed to the upper end of the outer cylinder 33 , a collar 44 of the plunger 42 and the lower surface of the spacer tube 43 A pair of spring receivers 45 are provided, and an outer coil spring 46 and an inner coil spring 47 are inserted between the spring receivers.
At the same time, the bolt 49 screwed and fixed to the upper end of the plunger 42 is fitted into the recess 52 of the flow joint 51 attached to the lower end of the rack 50 protruding from the pneumatic transducer 36. to prevent the plunger 42 from steadying.

The displacement of the incompressible fluid 28 displaces the diaphragm 40, which is transmitted through the hard rubber 48 to the plunger 42.
is displaced against the combined force of springs 46 and 47 which actuates a mechanism within pneumatic transducer 36 via rack 50 to produce a pneumatic signal from nozzle 53.

The pneumatic transducer 36 was filed in a patent application filed in 1986-140 by the present applicant.
No. 307, but since it has no direct relation 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 transition temperature range to convert the temperature of the temperature-measured fluid into mechanical displacement, and then fills this displacement into a connecting pipe such as a capillary corrugated pipe. The displacement is converted into fluid displacement and transmitted to the automatic temperature control unit at a remote point, where it is converted back into mechanical displacement to operate the pneumatic transducer. This has the advantage of being able to generate a pneumatic signal with high precision without using a Bourdon tube or a heros in the converter, and the automatic temperature control section can be provided at a location away from the engine etc. to facilitate adjustment.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a conventional device showing the temperature measuring section in longitudinal section, Fig. 2 is a longitudinal sectional view of the temperature measuring section of an embodiment of the present invention, and Fig. 3
The figure is also a longitudinal sectional view of the main part of the automatic temperature control section. 20...First capsule 22...First diaphragm 23...Wax 24...Second diaphragm 25...Second capsule 26.27.4T...Connecting pipe 27...・Incompressible fluid 29...Plunger 39...Third capsule 4o...Third diaphragm 36...Pneumatic conversion department agent Patent attorney Yujo - 1 other person Figure 1 161 2 Figure 0

Claims (1)

[Claims] The first stage of wax filling is performed in response to the temperature of the surrounding fluid to be measured.
The displacement generated in the first diaphragm that closes one side of the capsule is transmitted via the plunger to the second diaphragm that closes one side of the second capsule filled with incompressible fluid, and the displacement is transmitted to the second diaphragm. The displacement is transmitted to a third diaphragm that communicates with the second capsule through a connecting pipe and closes one side of a third capsule of the pneumatic converting section filled with the incompressible fluid together with the connecting pipe. Wax element type detection temperature remote transmission device.