Patent GB-751518-A (GB)
Title: Improvements in or relating to apparatus for measuring the quantity of heat consumedin a hot water heating plant
IPC: G01K17/14
Filed: 1954-03-12
Abstract: 751,518. Integrating-apparatus. COMPAGNIE POUR LA FABRICATION DES COMPTEURS ET MATERIAL D'USINES A GAZ. March 12, 1954 [April 24, 1953], No. 7306/54. Addition to 714,874. Class 106 (4). [Also in Group XX] The multiplying and integrating mechanism of the parent Specification is adapted for measuring the heat supplied by a hot water system, means are added for finding the difference of temperature in inlet and outlet and for modifying operation when the difference is in exceptional circumstances, outside certain limits, compensation for changes of density and in viscosity is made in the design and calibration of the apparatus and the temperature difference, flow and heat supplied are all shown on a single dial. As, shown, Fig. 1, shafts 30 and 1 are both driven from the shaft 101 of a hot water meter 100, the cams 25, 26 on wheels 28, 31 are driven in the same direction from the shaft 30 while their relative position is determined through the planet-wheel 36 by the angular setting of shaft 37 in accordance with the temperature difference in ducts 66, 71, Fig. 2, and the counter 10 is driven from the shaft 1 in each revolution thereof by an amount determined by the cams 25, 26 in their action on the pawl and rocker device with differential gearing 5, 6. Thermometric elements 63, 68 are connected by capillary tubes 64, 69 to bulbs 65, 70 in the ducts 66, 71 and, through forked rods 62, 67 and pivot pins 59, 60, position a rocking lever 58 formed with a slot 61. The lever 58 carries an adjustable bar 55 formed with a pin 54, working in a slot 57, for pivotally connecting the lever 58 to a forked rod 21 pivoted at its other end to a member 51 with rod portion 52 to which is clamped by a screw 49 a fork 48 connected by a shaft 50 to a sector 47 engaging a pinion 45 adjustably connected by a screw 46 to a hub 44 of a drum 42 mounted on the shaft 37 and formed with a lug 40 supporting a movable abutment 41 in the path of a lug 39 mounted on an arm 38 fast with the shaft 37. A spiral spring 43, secured at one end to the hub 44 and at the other to the lug 39, urges the latter into contact with the abutment 41. As shown in Fig. 3c, the cam 26 is riveted to the wheel 31 and carries fixed dogs 112, 113 and 114 extending toward the cam 25 which is pivoted at 109, Fig. 3a, to the wheel 28 and carries a fixed dog 111 extending towards the cam 26. The dog 111 is linked to a dog 116 on the wheel 28 by a spring 115. In operation the counter 10 is influenced by the position of cam 26 relative to cam 25 which is determined by the devices 63, 68 in accordance with the temperature difference between ducts 66, 71. If the difference is exceptionally small, the cam 26 approaches the cam 25 until the dog 113 of cam 26 engages the dog 111 of cam 25 and rocks the latter about pin 109 retracting it against spring 115 so that only cam 26 acts on the plate 18 and the counter stops until the temperature difference increases and the cam 25 is allowed to rock into operative position again. If the difference is exceptionally great the cam 26 nearly overtakes the cam 25 but is prevented by the dog 112 engaging the dog 111 and this maximum displacement between the cams continues, the reaction being transmitted to the spring 43 does not inhibit the action of the differencing device. Indications of flow by needles 107, 108 driven from the meter 100, of heat from the counter 10 and temperature difference from the drum 42 may all be given on a single dial. The elements 63, 68 need not be identical, differences in strokes of rods 62, 67 being taken up by suitably adjusting the position of pin 54. In calibrating the apparatus the drum 42 is arranged to read temperature differences correctly while the cams 25, 26 are relatively disposed to allow for changes of density and viscosity as well as temperature difference. The plate 18 is adapted to rock with a movement whose amplitude is limited by a slot whose opposite edges bear alternately against an abutment 20 which is preferably a screw-threaded rod terminating in a frustum of a cone where it contacts the plate 18 for the purpose of adjusting the amplitude.