CN2069551U - Double dial mechanical deformation type thermohydrograph - Google Patents

Abstract

The utility model discloses a double-needle mechanical deformation type thermohygrometer for simultaneously displaying environment temperature and humidity. A temperature needle is driven by a thermally-sensitive element. A humidity needle is driven by a humidity sensitive element. The utility model has the advantages of visual reading and convenient operation. Because two kernel components are both sensitive, the utility model has the advantages of high precision, simple structure, firmness, durability, and reasonable price.

Description

Two pointer mechanically deform formula thermohygrometers

The utility model is the mechanically deform formula thermohygrometer of a kind of pair of pointer, and the display environment temperature and humidity belongs to novel general instrument simultaneously.

The wet and dry bulb thermohygrometer of Chu Shouing is to produce difference by dry bulb and two thermometers of wet bulb in the market, reads this difference number, tables look-up and just can obtain the reading of humidity.This table is not directly perceived, and the water under glass bead also will often add, and promptly can not use below 0 ℃, and containing alkali impurity in the water also influences precision, and in addition, glass tube is frangible, and grade not attractive in appearance also is its shortcoming.Other has a kind of hair type thermohygrometer that is called, and is the simple pointer formula, is made up of hair, hairspring, pulley, set screw, central shaft, counterbalance weight, changes by the effects of humidity change hair length and comes rotating pointer.Like this, add water, shortcoming such as frangible, not directly perceived though overcome the wet and dry bulb thermohygrometer, complex structure, cost is higher, and precision is not high again.

The purpose of the utility model patent is the shortcoming that overcomes original thermohygrometer, develops a kind of reading intuitively, and is easy to use, and simple in structure, solid durable, the also rational product of cost.

Two pointer mechanically deform formula thermohygrometers as shown in Figure 1.The front intersects up and down for left and right two pointers, and each is irrelevant.The right side is a temperature pointer, points out the scale value of upper left side temperature; A left side is a humidity pointer, points out the scale value of upper right side humidity, and two pins are indication respectively simultaneously, also is that each is irrelevant.Front side view on Fig. 2 is expressed the gear train of two pointers, is fixed on the index dial, but also is two each incoherent constituting bodies.The kind of drive of two cover mechanisms is the same, and different are one is the thermal sensing element of temperature, and another is the humidity-sensitive element of humidity.

Respectively two cover systems are set forth below.

As shown in Figure 3, in the gear train of temperature, the parts of core are thermal sensing element [7], this is to be made by bimetallic material 5J18 or 5J19, be the volute spring of a balance-like, the outer end relative fixed is being adjusted on the support [5] inner concatenation pointer rotation axis [6], drive needle guard [1] and pointer [2] by rotation axis, swing in fixed hub [3].Temperature value and pointer displacement amount are curved line relations, and therefore, scale mark [4] also is one section curve, thereby realize the direct indication of ambient temperature value.

Thermal sensing element varies with temperature and the ultimate principle that produces mechanically deform is because bimetallic strip is combined into by two different metals, two kinds of metals respectively have its different thermal expansivity, when temperature raises or reduce, an elongation (or shortening) is more, one is then lacked, thereby generation flexural deformation, drive pointer and rotate.

As shown in Figure 5, in the gear train of humidity, the parts of core are humidity-sensitive element [14], and this is to be combined by two kinds of different materials, also is the volute spring of a balance-like, the outer end relative fixed is on [12], inner concatenation pointer rotation axis [13] when volute spring produces mechanically deform with the humidity variation, drives pointer rotation axis [13], drive needle guard [8] and pointer [9] by rotation axis, swing in fixed hub [10].Humidity value and pointer displacement amount also are curved line relations, and therefore, scale mark [11] also is one section curve, thereby realize the direct indication of ambient humidity value.

It is because the two-layer compound sheet is two kinds of different materials that humidity-sensitive element changes the ultimate principle that produces mechanically deform with humidity, and one side is an elastic alloy, and it is not out of shape with humidity basically, has elastic force to reset; Another side is a kind of elite macromolecular material, and it is to humidity sensitive, and humidity is in case change, it also produces mechanically deform thereupon, occurs expanding or shrinking, and is so just the same with bimetallic temperature sensor mechanical effect principle, also produce a kind of flexural deformation, variation occurs rotating.Good affinity is arranged between this kind macromolecular material and the elastic alloy, can bear cut, draw, strength such as stripping, put from this, also the structural behaviour of similar bimetallic strip.

In sum, as can be seen, this novel thermohygrometer is read directly perceived, and environment temperature and humidity come into plain view; Easy to use; Two kinds of core components are all very sensitive, the precision height; Simple in structure, solid durable.

Below to three pages of accompanying drawings note in addition:

Fig. 1,2 pairs of pointer mechanically deform formula thermohygrometer overall construction drawings

Fig. 3,4 temperature partial structure figure

Fig. 5,6 humidity partial structure figure

Embodiment 1 JWS-A type (1) product specification pattern: octagon 205 * 205 * 33 (mm) (2) measurement range: temperature-10 ℃～+ 40 ℃

Humidity 10%RH～90%RH (3) precision: below the temperature-10 ℃-10 ℃～+ 40 ℃+more than 40 ℃

± 2 ℃ ± 1.5 ℃ ± 2 ℃ humidity is below 40% 40%～75% 75% above in the time of 25 ℃ one-level secondary one-level secondary one-level secondary

±7％ ±10％ ±5％ ±7％ ±7％ ±10％

Claims (5)

1. two pointer mechanically deform formula thermohygrometer, comprise the dial plate, temperature pointer [2] and the humidity pointer [9] that have two scales of temperature and humidity, it is characterized in that temperature pointer rotated by the strain that thermal sensing element [7] produces, humidity pointer is rotated by the strain that humidity-sensitive element [14] produces.

2. as claimed in claim 1 pair of pointer mechanically deform formula Hygrothermograph is characterized in that making thermal sensing element [7] with the thermo-sensitive material hairspring, an end relative fixed, and a client link rotation axis [6] rotates in fixed hub [3].

3. as claimed in claim 1 pair of pointer mechanically deform formula Hygrothermograph is characterized in that thermo-sensitive material is a bimetallic strip, and model is 5J18 or 5J19.

4. as claimed in claim 1 pair of pointer mechanically deform formula Hygrothermograph is characterized in that the humidity-sensitive element [14] of humidity pointer drive mechanism with the hairspring shape, an end relative fixed, and an end connects rotation axis [13], rotates in fixed hub [10].

5. as claimed in claim 1 pair of pointer mechanically deform formula Hygrothermograph is characterized in that humidity-sensitive element is the two-layer compound sheet, and one side is an elastic alloy, and one side is a macromolecular material.

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