CN202974543U

CN202974543U - Pressure transmitter

Info

Publication number: CN202974543U
Application number: CN 201220651812
Authority: CN
Inventors: 徐才超; 周建平; 王俊
Original assignee: Zhejiang DunAn Hetian Metal Co Ltd
Current assignee: Zhejiang DunAn Hetian Metal Co Ltd
Priority date: 2012-12-03
Filing date: 2012-12-03
Publication date: 2013-06-05
Anticipated expiration: 2022-12-03

Abstract

The utility model discloses a pressure transmitter, including a shell and a pressure core body arranged in the shell. The pressure transmitter is characterized in that the shell comprises a step and an inner side wall, the upper end face of the pressure core body abuts against the lower end face of the step, gaps are formed between the inner side wall of the shell and the lower end face of the step of the shell and between the inner side wall of the shell and the outer side wall of the pressure core body, and the gaps are filled with a sealing material to realize sealing. According to the utility model, the sealing material is used for sealing and fixing the pressure core body and the shell of the pressure transmitter, so safety and reliability in the aspect of connection strength are obtained, and a phenomenon similar to leakage of an internal medium due to poor sealing performance caused by insufficient press mounting of a jump ring or rushing of components out of the shell under action of pressure is avoided; and the pressure transmitter provided by the utility model has the advantages of a simple assembling process and low accuracy requirements on parts and overcomes the problem of great difficulty in processing of parts in the prior art.

Description

A kind of pressure unit

Technical field

The utility model relates to Pressure Control Technology field, particularly a kind of pressure unit.

Background technology

Pressure unit be a kind of with medium (all kinds of flowable materials) pressure-acting on the core body circuit block, make pressure elements deform, thereby make the electric bridge that is etched on the pressure core body produce corresponding electric signal, then converted thereof into the Voltage-output signal of standard by modulate circuit.

Please refer to Fig. 1 and Fig. 2, Fig. 1 is the structural representation of a kind of typical pressure unit in prior art; Fig. 2 is pressure unit A shown in Figure 1 place partial enlarged drawing.

As depicted in figs. 1 and 2, this pressure unit mainly comprises shell 1 ＇, be located at pressure core body 2 ＇, O-ring seal 3 ＇, cage ring 4 ＇, jump ring 5 ＇, circuit block 6 ＇ and socket 7 ＇ of shell 1 ＇ inside, shell 1 ＇ is provided with base 11 ＇, offer medium inlet 12 ＇ on base 11 ＇, wherein O-ring seal 3 ＇, pressure core body 2 ＇, cage ring 4 ＇ press-fit in base 11 ＇, and 5 ＇ position by jump ring; O-ring seal 3 ＇, pressure core body 2 ＇, base 11 ＇ surround the cavity of connection medium import 12 ＇, and the sealing surface of cavity comprises the bottom surface of pressure core body 2 ＇, the trench bottom surfaces of base 11 ＇, O-ring seal 3 ＇, the groove external cylindrical surface of O-ring seal 3 ＇.

require to guarantee the permission decrement of O-ring seal 15% ~ 30% due to O-ring seal 3 ＇ butt-end packings, therefore the machining precision of each seal member just need be subjected to O-ring seal 3 ＇ to allow the compression quantitative limitation, general O-ring seal specification size is directly proportional to the decrement of O-ring seal, the O-ring seal specification is large, decrement is just large, and the O-ring seal specification is directly proportional to the volume of pressure unit, and volume affects cost, so the volume of the pressure variation device in existing market is generally less, thereby what use is all O-ring seals than small dimension, and than the O-ring seal decrement scope of small dimension, need by O-ring seal 3 ＇, pressure core body 2 ＇, cage ring 4 ＇, jump ring 4 ＇, the seal members such as base 11 ＇ are shared, this just makes the requirement on machining accuracy of each parts high, cause each component processing difficulty to increase, slip is high, production efficiency is low, production cost is high.

How therefore a kind of pressure unit be provided, and the processing technology of its inner components requires lower, and assemble flow is simple, is the problem that those skilled in the art need solution at present badly.

The utility model content

The purpose of this utility model is to provide a kind of pressure unit, and the processing technology of its parts requires lower, and assemble flow is simple.

For achieving the above object, the utility model provides a kind of pressure unit, comprise shell, be arranged at the pressure core body in described shell, it is characterized in that described shell comprises step and madial wall, the upper surface of described pressure core body and the lower surface of step against, form the gap between the lateral wall of the madial wall of described shell and shell step lower surface, pressure core body, be filled with sealing substance in described gap, form sealing.

Preferably, pressure unit also comprises air inlet base, the pad that is connected and fixed with shell, and described pad and pressure core body are set in turn in described shell from the bottom to top, and the upper surface of air inlet base is against the lower surface of pad.

Preferably, the hardness of described pad is less than the hardness of pressure core body.

Preferably, described sealing substance is nylon or epoxy resin.

Preferably, be connected and fixed by sealing substance between described pressure core body and shell.

Compared with prior art, pressure unit in the utility model seals fixation pressure core body and shell by sealing substance, safe and reliable on strength of joint, there is not the similar circlip press-loading bad phenomenon that causes interior media leakage or parts to go out under pressure shell of sealing property that makes not in place; And the utility model assembling process is simple, low to the accuracy requirement of spare and accessory parts.

In preferred version of the present utility model, between air inlet base and pressure core body, pad is set, can slow down the fashionable pressure core body vibrations that cause of tested pressure medium flow, prevent that simultaneously tested pressure medium flow to the gap between shell madial wall and pressure core body lateral wall, playing sealing function.

Description of drawings

Fig. 1 is the structural representation of a kind of typical pressure unit in prior art;

Fig. 2 is the partial enlarged drawing at pressure unit A shown in Figure 1 place;

Fig. 3 is the structural representation of a kind of embodiment of pressure unit provided by the utility model;

Fig. 4 is the structural representation of shell shown in Figure 3;

Fig. 5 is pressure core schematic diagram shown in Figure 3;

Fig. 6 is pressure unit B shown in Figure 3 place partial enlarged drawing.

Embodiment

Core purport of the present utility model is providing a kind of pressure unit, and the processing technology of its parts requires lower, and assemble flow is simple.

For making those skilled in the art better understand the technical solution of the utility model, the utility model is described in further detail with the structural representation of embodiment by reference to the accompanying drawings.

Please refer to Fig. 3, Fig. 4, Fig. 5 and Fig. 6, Fig. 3 is the structural representation of a kind of embodiment of pressure unit provided by the utility model; Fig. 4 is the structural representation of shell shown in Figure 3; Fig. 5 is pressure core schematic diagram shown in Figure 3; Fig. 6 is pressure unit B shown in Figure 3 place partial enlarged drawing.

Pressure unit of the present utility model comprises that inside has the shell 1 of cavity structure, air inlet base 2, pad 3, pressure core body 4 formations, its housing 1 is welded and fixed with air inlet base 2, pad 3 and pressure core body 4 are fitted in shell 1 from down to up successively, and the upper surface of air inlet base 2 is against the lower surface of pad 3.unlike the prior art be, present embodiment has been abandoned and has been adopted jump ring 5 ＇ (see figure 1)s to carry out the method for axial location in existing mode, replace is at interior step 11 and the madial wall 12 of arranging of shell 1, make the lower surface 111 of step 11 be resisted against the upper surface 41 of pressure core body 4, there is the gap between the madial wall 12 of shell 1 and the lateral wall 42 of pressure core body 4, be filled with sealing substance 5 in the gap, sealing substance 5 is full of shell 1 madial wall 12, the space that shell 1 step 11 lower surfaces 111 and pressure core body 4 lateral walls 42 surround, make shell 1 and pressure core body 4 form sealing, shell 1 cavity is divided into the pressure chamber of two not conductings, sealing substance 5 plays fixation simultaneously, make pressure core body 4 be fixedly connected with shell 1, described sealing substance 5 can but be not limited to nylon, epoxy resin, can be to form sealing by conversion modalities, the material that solidifies.

The mounting means of its housing 1, sealing substance 5 and pressure core body 4 is specially:

1, the upper surface 41 of pressure core body 4 and lower surface 111 press seals of shell 1 step 11;

2, the sealing substance 5 of liquid state or powdery is filled the space that shell 1 madial wall 12, shell 1 step 11 lower surfaces 111 and pressure core body 4 lateral walls 42 surround;

3, make the sealing substance 5 of liquid state or powdery solidify by techniques such as heating, oven dry.

After sealing substance 5 solidified, sealing substance 5 and shell 1 step 11 lower surfaces 111, pressure core body 4 lateral surfaces 42, that shell 1 medial surface 12 forms sealing was fixing.

Because sealing substance 5 is to fill with the form of liquid state or powdery, therefore as long as guarantee to fill fully, evenly, can play sealing effectiveness, and the gap length between shell 1 madial wall 12 and pressure core body 4 lateral walls 42 is irrelevant, therefore lower for the dimension precision requirement of

shell

1 and 4 liang of parts of pressure core body, reduce cost, improved efficient.

Owing to adopting sealing substance 5 fixing seals, reduce the seal members such as cage ring 4 ＇, jump ring 5 ＇ with respect to prior art simultaneously, therefore reduced cost.

After shell 1, sealing

substance

5 and 4 sealings of pressure core body are fixing, between pressure core body 4 and air inlet base 2, pad 3 is set, main sealing and the antihunt action of rising of this pad 3, shell 1 and air inlet base 2 are welded and fixed.When tested pressure medium is flowed into by air inlet base 2, act on pressure core body 4, pressure core body 4 can shake, pad 3 has been avoided the direct contact between pressure core body 4 and air inlet base 2, slow down the vibrations of pressure core body 4, therefore the hardness of pad 3 is less than the hardness of pressure core body 4, pad 3 has stoped tested pressure medium flow to the gap between shell 1 madial wall 12 and pressure core body 4 lateral walls 42 simultaneously, in the situation that sealing substance 5 plays sealing function, play multi-sealed effect.

The above is only preferred implementation of the present utility model; should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims

1. pressure unit, comprise shell, be arranged at the pressure core body in described shell, it is characterized in that described shell comprises step and madial wall, the upper surface of described pressure core body and the lower surface of step against, form the gap between the lateral wall of the madial wall of described shell and shell step lower surface, pressure core body, be filled with sealing substance in described gap, form sealing.

2. pressure unit according to claim 1, it is characterized in that: described pressure unit also comprises air inlet base, the pad that is connected and fixed with shell, described pad and pressure core body are set in turn in described shell from the bottom to top, and the upper surface of air inlet base is against the lower surface of pad.

3. pressure unit according to claim 2, it is characterized in that: the hardness of described pad is less than the hardness of pressure core body.

4. the described pressure unit of according to claim 1 to 3 any one, it is characterized in that: described sealing substance is nylon or epoxy resin.

5. the described pressure unit of according to claim 1 to 2 any one, is characterized in that: be connected and fixed by sealing substance between described pressure core body and shell.