CN202949666U

CN202949666U - Instrument plastic casing capable of being sealed from the outside efficiently

Info

Publication number: CN202949666U
Application number: CN 201220581272
Authority: CN
Inventors: 李新兴; 方欣
Original assignee: QINGDAO HIWITS METER CO Ltd
Current assignee: QINGDAO HIWITS METER CO Ltd
Priority date: 2012-11-07
Filing date: 2012-11-07
Publication date: 2013-05-22
Anticipated expiration: 2022-11-07

Abstract

The utility model provides an instrument plastic casing capable of being sealed from the outside efficiently. The instrument plastic casing can enable the inside and outside atmosphere to be balanced for a long time, and an upper cover and a lower cover of the instrument plastic casing are easy to connect and convenient to maintain. The instrument plastic casing capable of being sealed from the outside efficiently comprises a casing upper cover, a casing lower cover, a casing screw, a screw sealing ring, an annular sealing ring, a circuit part, a ventilating valve and cable sealing rings. The casing upper cover is directly formed in injection mode and comprises a screw hole position, a screw sealing ring positioning groove and an annular sealing ring positioning groove; the casing lower cover is directly formed in injection mode and comprises a screw hole position corresponding to the casing upper cover, a position screw pillar for the circuit part, a cable sealing ring hole position and a ventilating valve hole position; and the ventilating valve has the function of enabling the air to be bidirectional and enabling the moisture to be unidirectional. By means of combined functions of five sealing rings, a plurality of cable sealing rings, the ventilating valve and the screw, the protective level of the casing having the circuit part can reach IP67 continuously.

Description

A kind of and extraneous efficient sealed instrument plastic casing

Technical field

The utility model relates to field of sealing technology, particularly a kind of and extraneous efficient sealed instrument plastic casing.

Background technology

Because needs are placed on enclosure interior with circuit, therefore this housing is comprised of two parts at least.By two or the housing that forms of multi-part more, if will realize waterproof and dustproof, the moisture-proof function of circuit part, present mode has following four kinds: (1) seals by the fixing mode of O-ring seal attachment screw; (2) increased a seal isolation chamber on the basis of first kind of way; (3) water-proof silica-gel layer or three anti-paints will be coated with on circuit; (4) after circuit is placed inside, that housing is fully integrally welded with ultrasonic technology.

The first sealing means, can play waterproof effect in short time, classification of waterproof can reach IP54 at most, but As time goes on, variation along with ambient pressure and enclosure interior temperature, different from the ratio that expands with heat and contract with cold of screw due to housing, screw diminishes gradually to the snap-in force of housing, and the sealing between housing is destroyed; In addition, O-ring seal is easily affected by environment, occur aging, thereby strengthened the degree of seal break-off between housing.Can realize therefore the first sealing means reaches sealing in a short time, but can not guarantee long-time sealing.

The second sealing means, although increased isolated chambers on the first sealing means, though can not solve the sealing after the first kind of way passage of time, infeasible equally.

The third sealing means, because circuit part is covered by water-proof silica-gel layer or three anti-paints, can reach sealing, in case but equipment breaks down, need repairing, need after breakdown of coating, could change top components and parts, complex process, and also may have simultaneously destroyed possibility of circuit board when destroying coating, so also infeasible.

The 4th kind of sealing means, similar with the third sealing means, can only be used for disposable products, can not carry out follow-up maintenance and maintenance.

Summary of the invention

In order to solve above technical problem, the utility model proposes a kind of and extraneous efficient sealed instrument plastic casing, can make the inside and outside atmospheric pressure of housing keep permanent balance, avoid housing to change because bearing positive and negative pressure the phenomenon generation that causes continuous damage between the housing upper and lower covers; And upper and lower covers of the present invention connects simple, convenient for maintaining.

The technical solution of the utility model is achieved in that

A kind of and extraneous efficient sealed instrument plastic casing comprises: case top lid 8, housing lower cover 16, housing screw 1, screw sealing ring 3, O-ring seal 5, cable sealing ring 9, circuit part 13 and the vent valve 20 that air is two-way, steam is unidirectional; The direct injection mo(u)lding of described case top lid 8 comprises the screw hole position, comprises screw sealing ring location notch 2, O-ring seal location notch 4 on the screw hole position; The direct injection mo(u)lding of described housing lower cover 16 comprises corresponding with case top lid 8 screw hole position 11, circuit part dog screw post 14, cable sealing annular distance position 18, ventilative valve opening position 17.

Alternatively, also comprise Waterproof push-button plug 7.

Alternatively, endoporus with the corresponding size of cable is arranged on described cable sealing ring 9.

Alternatively, described screw sealing ring 3 entirely is embedded in screw sealing ring location notch 2.

Alternatively, described O-ring seal 5 entirely is embedded in O-ring seal location notch 4.

Alternatively, described cable sealing ring 9 entirely is embedded into cable sealing 18 places, annular distance position.

Alternatively, described vent valve 20 is tightened in 17 places, ventilative valve opening position by vent valve screw 19, and vent valve 20 circuit part 13 is dorsad installed.

Alternatively, described circuit part 13 is arranged on the circuit part dog screw post 14 of housing lower cover 16 by circuit part screw 15.

Alternatively, described case top lid 8 is tightened by housing screw 1 with housing lower cover 16.

The beneficial effects of the utility model are:

(1) can be placed on water below 1 meter and guarantee not intake in interior 2 hours, circuit part shows without any abnormal;

(2) dismounting, easy to maintenance really reaches the function of degree of protection IP67.

Description of drawings

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the utility model and extraneous efficient sealed instrument plastic casing upper cover exploded view;

Fig. 2 is the utility model and extraneous efficient sealed instrument plastic casing lower cover exploded view;

Fig. 3 is design sketch after the utility model is assembled with extraneous efficient sealed instrument plastic casing.

Symbol description:

1. housing screw 2. screw sealing ring location notch 3. screw sealing ring 4. O-ring seal location notchs

5. O-ring seal 6. button plug location notch 7. button plug 8. case top lid

9. cable sealing ring 10. battery compartment 11. housing lower cover screw hole 12. batteries

13. circuit part 14. circuit part dog screw post 15. circuit part screw 16. housing lower covers

17. ventilative valve opening position 18. cables sealing annular distance position 19. vent valve screw 20. vent valves

21. cable

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.

Of the present utility model and extraneous efficient sealed instrument plastic casing, case top lid is through the Shooting Technique single injection-molded, and this upper cover contains four screw holes, 4 screw sealing ring location notchs and 1 ring packing groove that is used for locating O-ring seal; The housing lower cover is through the Shooting Technique single injection-molded, and should under cover and contain 4 screw hole positions corresponding with upper cover, 1 ventilative valve opening position, several cables sealing annular distance positions and protruding with ring packing corresponding to upper cover, with reach and upper cover between closely cooperate; Cable passes cable sealing ring endoporus and is connected with circuit board; Vent valve is screwed on ventilative valve opening, and vent valve has the function that air is two-way, steam is unidirectional; Upper lower casing is tightened with lower casing after passing upper casing and 4 screw sealing rings with 4 screws; By above 5 road sealing rings, some cable sealing rings, vent valve and screw synergy, make the degree of protection of the housing that contains circuit part can continue to reach IP67.

In conjunction with Fig. 1-Fig. 3, the utility model can be applied to the calorimeter field, mainly be used as the waterproof and dampproof of calorimeter, comprise case top lid 8, housing lower cover 16, housing screw 1, screw sealing ring 3, O-ring seal 5, button plug 7, cable sealing ring 9, battery 12, circuit part 13, circuit part screw 15, vent valve screw 19, vent valve 20 and cable 21.

Particularly, the direct injection mo(u)lding of case top lid 8 comprises the screw hole position, comprises screw sealing ring location notch 2, button plug location notch 6, O-ring seal location notch 4 on the screw hole position; The direct injection mo(u)lding of housing lower cover 16 comprises corresponding with case top lid 8 screw hole position 11, circuit part dog screw post 14, battery compartment 10, cable sealing annular distance position 18, ventilative valve opening position 17; Vent valve 20 has the function that air is two-way, steam is unidirectional; Button plug 7 is the Waterproof push-button plug; Endoporus with cable 21 corresponding sizes is arranged on cable sealing ring 9; What screw sealing ring 3 was smooth is embedded in screw sealing ring location notch 2; What O-ring seal 5 was smooth is embedded in O-ring seal location notch 4; What button plug 7 was smooth is embedded in button plug location notch 6; The cable that is embedded into that cable sealing ring 9 is smooth seals 18 places, annular distance position; Vent valve 20 is tightened in 17 places, ventilative valve opening position by vent valve screw 19, and vent valve 20 circuit part 13 is dorsad installed; Circuit part 13 is arranged on the circuit part dog screw post 14 of housing lower cover 16 by circuit part screw 15; Battery 12 is embedded in the battery compartment 10 of housing lower cover 16, and is connected with circuit part 13; Cable 21 is connected with circuit part 13 after passing cable sealing ring 9 endoporus; Case top lid 8 is tightened by housing screw 1 with housing lower cover 16.

Of the present utility model and extraneous efficient sealed instrument plastic casing can be placed on water below 1 meter to be guaranteed not intake in interior 2 hours, and circuit part shows without any abnormal, and dismounting, easy to maintenance, really reached the function of degree of protection IP67.

The above is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.

Claims

One kind with extraneous efficient sealed instrument plastic casing, it is characterized in that, comprising: case top lid (8), housing lower cover (16), housing screw (1), screw sealing ring (3), O-ring seal (5), cable sealing ring (9), circuit part (13) and the vent valve (20) that air is two-way, steam is unidirectional;

Directly injection mo(u)lding of described case top lid (8) comprises the screw hole position, comprises screw sealing ring location notch (2), O-ring seal location notch (4) on the screw hole position;

Directly injection mo(u)lding of described housing lower cover (16) comprises the screw hole position (11) corresponding with case top lid (8), circuit part dog screw post (14), cable sealing annular distance position (18), the valve opening position (17) of breathing freely.
2. as claimed in claim 1 and extraneous efficient sealed instrument plastic casing, is characterized in that, also comprises Waterproof push-button plug (7).
3. as claimed in claim 1 and extraneous efficient sealed instrument plastic casing, is characterized in that the endoporus with the corresponding size of cable is arranged on described cable sealing ring (9).
4. as claimed in claim 1 and extraneous efficient sealed instrument plastic casing, is characterized in that, described screw sealing ring (3) entirely is embedded in screw sealing ring location notch (2).
5. as claimed in claim 1 and extraneous efficient sealed instrument plastic casing, is characterized in that, described O-ring seal (5) entirely is embedded in O-ring seal location notch (4).
6. as claimed in claim 1 and extraneous efficient sealed instrument plastic casing, is characterized in that, described cable sealing ring (9) entirely is embedded into cable sealing annular distance position (18) and locates.
7. as claimed in claim 1 and extraneous efficient sealed instrument plastic casing, is characterized in that, described vent valve (20) is tightened in ventilative valve opening position (17) by vent valve screw (19) and locates, and vent valve (20) circuit part (13) is dorsad installed.
8. as claimed in claim 1 and extraneous efficient sealed instrument plastic casing, is characterized in that, described circuit part (13) is arranged on the circuit part dog screw post (14) of housing lower cover (16) by circuit part screw (15).
9. as claimed in claim 1 and extraneous efficient sealed instrument plastic casing, is characterized in that, described case top lid (8) is tightened by housing screw (1) with housing lower cover (16).