A kind of refrigeration system and pressure transducer thereof
Technical field
The utility model relates to refrigeration system technical field, particularly relates to a kind of refrigeration system and pressure transducer thereof.
Background technology
Pressure transducer is as the primary parts of pressure signal acquisition system, its principle of work is that the pressure signal of fluid is become electric signal by certain method migration, electric signal after treatment, as the input signal of control pressurer system, through the process of control system, realizes automatically controlling.At present, because of the particular requirement of pressure transducer use occasion, General Requirements pressure transducer should have good moistureproof and waterproof performance, otherwise once moisture or water enter its inside, pressure transducer will be caused to lose efficacy.
Please refer to Fig. 1, Fig. 1 is the structural representation of a kind of set-up mode of pressure transducer in prior art.
As shown in Figure 1, pressure enters from pressure inlets 100, after pressure signal experienced by pressure sensitive core body 200, be converted to electric signal, circuit part 400 is delivered to by guide pin 300, circuit part 400 pairs of signals carry out amplification process and temperature compensation, are delivered in control system by voltage signal by wire harness 500.
Wherein, seal glass 600 and pedestal 700 are sintered to fix necessarily, guide pin 300 is embedded with in seal glass 600, plastic casing 800 packs into pedestal 700 with its one end, and press-fit with it, form cavity 900 between, in cavity 900, inject sealant, to realize the sealing of pedestal 700 and plastic casing 800.
In existing structure, the ledge structure that pedestal 700 and plastic casing 800 assemble is interior step, and namely setting table stage structure on the inwall of pedestal 700, is then inserted in pedestal 700 by the end of plastic casing 800; As can be seen from Figure 1, pedestal 700 forms the invasive channel of water with the faying face of plastic casing 800, and plastic casing 800 is arranged on the top of pedestal 700, once the words having moisture to invade, due to the gravity effect of water, moisture is easy to flow into from top to bottom in cavity 900.
Moreover the bottom of the cavity 900 be made up of pedestal 700 and plastic casing 800 is also pressed with pad, causes sealant circulation passage too small, have impact on the filling of sealant, likely can poorly sealed reality, or there is pore etc.; Once when high/low temperature is expanded with heat and contract with cold, occur between pedestal 700 and sealant being separated, moisture just likely invades interiors of products along pedestal 700 and the jointing edge of plastic casing 800 from top to bottom, causes product failure, even cause dielectric voltage withstand bad, there is potential safety hazard.
In addition, if the edge of sealant and pedestal 700 combines loosely, being easy to cause pedestal 700 and plastic casing 800 to be thrown off, there is risk in intensity aspect.
Therefore, how designing a kind of pressure transducer, to improve its sealing property, effectively prevent moisture from invading, is the technical matters that those skilled in the art need solution at present badly.
Utility model content
The purpose of this utility model is to provide a kind of refrigeration system and pressure transducer thereof, and its sealing reliability is higher, can effectively prevent moisture from invading.
For solving the problems of the technologies described above, the utility model provides a kind of pressure transducer, the housing comprising pedestal and be tightly connected with it, the upper end of described pedestal has between outer land terrace, the lower end of described housing has interior step surface, described between outer land terrace and described interior step surface press-fit, to form cavity between described pedestal and described housing, be filled with sealant in described cavity.
Pressure transducer of the present utility model, pedestal is provided with between outer land terrace, housing is arranged interior step surface, then housing with its between outer land terrace compression fit on the between outer land terrace of pedestal, faying face is from bottom to top formed between the two on direction from outside to inside, because moisture can only immerse cavity along described faying face, even if then have moisture or water vapour in external environment condition, also can only invade along the rudimentary step of step surface, inside cavity can not be invaded from bottom to up, therefore said structure can effectively prevent moisture from invading, and then improve the sealing of pressure transducer, ensure that its reliability used, improve its intensity, prevent it to lose efficacy, extend its serviceable life.
Alternatively, also comprise and pad the insulation spacer that is contained on the bottom surface of described pedestal, the bottom surface of described pedestal is provided with groove along the outward flange of described insulation spacer, and described groove can be communicated with described cavity.
Alternatively, described groove stretches into the bottom of described insulation spacer with its inside, and its outside is protruding by the outward flange of described insulation spacer, to be communicated with described cavity.
Alternatively, the outside of described groove extends out to the inwall of described pedestal, and is outwards continued to extend by the inwall of described pedestal, to form ring groove in the bottom of described pedestal.
Alternatively, the bottom of described pedestal also has ring groove, and described ring groove is communicated with described cavity.
Alternatively, also comprise pressure sensitive core body and treatment circuit, the bottom frit of described pedestal is fixed with seal glass, and in described seal glass, intercalation has guide pin, and the lower end of described guide pin is connected with described pressure sensitive core body, and described treatment circuit is accessed in upper end.
The utility model also provides a kind of refrigeration system, comprises the pressure transducer described in above-mentioned any one.
Because refrigeration system of the present utility model has the pressure transducer described in above-mentioned any one, therefore the technique effect that the pressure transducer described in above-mentioned any one produces all is applicable to refrigeration system of the present utility model, repeats no more herein.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of set-up mode of pressure transducer in prior art;
Fig. 2 provides by the utility model the structural representation of pressure transducer in a kind of embodiment;
Fig. 3 is the close-up schematic view of part A in Fig. 2;
Fig. 4 provides by the utility model the structural representation of pressure transducer in another kind of embodiment;
Fig. 5 is the close-up schematic view of part B in Fig. 4.
In Fig. 1:
Pressure inlets 100, pressure sensitive core body 200, guide pin 300, circuit part 400, wire harness 500, seal glass 600, pedestal 700, plastic casing 800, cavity 900
In Fig. 2-5:
Pedestal 1, between outer land terrace 11, groove 12, ring groove 13, housing 2, interior step surface 21, cavity 3, insulation spacer 4, pressure sensitive core body 5, treatment circuit 6, seal glass 7, guide pin 8, wire harness 9, pressure inlets 10
Embodiment
Core of the present utility model is to provide a kind of refrigeration system and pressure transducer thereof, and its sealing reliability is higher, can effectively prevent moisture from invading.
The utility model provides a kind of pressure transducer, the housing 2 mainly comprising pedestal 1 and be tightly connected with it, forms airtight cavity 3 between the two, filling sealing agent in this cavity 3, to realize the positiver sealing of pedestal 1 and housing 2, can the circuit part processed voltage (namely hereinafter described treatment circuit 6) and the wire harness 9 etc. be connected with outside be built in cavity 3, then by the sealed bottom of pedestal 1, and respond to core body 5 at the bottom Bonding pressure of pedestal 1, the pressure signal sensed is converted to electric signal, then the electric signal of pressure sensitive core body 5 is received by conducting parts such as guide pin 8 grade, and be passed to the circuit part be built in cavity 3, by circuit part, amplification process and temperature compensation are carried out to signal, then by process after signal transmission to wire harness 9, and then be passed to control system by wire harness 9, to realize the automatic control of pressure.
In order to make those skilled in the art person understand the utility model scheme better, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Please refer to Fig. 2-5, in pressure transducer of the present utility model, the upper end of pedestal 1 and the lower end of housing 2 are tightly connected, then can arrange corresponding step end face in the position of both correspondences, so that both realize reliable sealing.
Described upper and lower orientation when normally using with pressure transducer is reference herein, and under the direction on ground is, the direction away from ground is upper; Described inside and outside with the axis of pedestal 1 and housing 2 for reference, in the direction of both axis is, the direction away from both axis is outward.
Particularly, the upper end of pedestal 1 can arrange between outer land terrace 11, and namely the outer wall of pedestal 1 upper end is inwardly recessed setting, so as with not recessed part forming station stage structure, make the upper end of pedestal 1 form between outer land terrace 11; Correspondingly, the inwall of housing 2 lower end can be recessed, thus the part not recessed with upper end forms interior step surface 21, as shown in Figure 3 and Figure 4.By said structure, the lower end of housing 2 is pressed on step surface in it 21 on the between outer land terrace 11 of pedestal 1 upper end, both compression fit, forms cavity 3, then filling sealing agent in cavity 3 jointly to enclose, and realizes being tightly connected of pedestal 1 and housing 2.
In the utility model, the position that pedestal 1 and housing 2 assemble is set between outer land terrace 11, when then it coordinates with housing 2, housing 2 outside, pedestal 1 is interior, housing 2 is sleeved on the outside of pedestal 1, on direction from outside to inside, form faying face from bottom to top between the two, this faying face also forms the invasive channel of moisture, if then there is moisture to invade, also can invade from outside to inside along faying face, but because faying face extends from bottom to top on direction from outside to inside, under gravity, moisture has the trend moved downward, if then the hypersynchronous of moisture is less than the position of faying face, substantially cavity 3 cannot be invaded inner, thus effectively prevent moisture from invading.When moisture cannot invade cavity 3, pressure transducer has good moistureproof and waterproof performance, and its usability is better, and has good sealing property, thus avoids pressure transducer to lose efficacy, and extends its serviceable life; Because moisture cannot invade cavity 3 inside substantially, also would not affect the insulativity of cavity 3 inside, avoid occurring defective insulation, improve safety in utilization.
The housing 2 of the application can adopt plastic casing 2, to play the effect with external insulation, avoids the normal use affecting pressure transducer.
On the basis of the above, the application can also arrange insulation spacer 4, and this insulation spacer 4 can be arranged on the bottom surface of pedestal 1, then on the bottom surface of pedestal 1, can arrange groove 12 along the outward flange of insulation spacer 4, and groove 12 is communicated with cavity 3, as shown in Figure 3 and Figure 4.
Adopt said structure, the bottom of pedestal 1 is provided with groove 12, and groove 12 is connected with cavity 3, insulation spacer 4 is avoided to be closed by the bottom space of pedestal 1, the volume that whole groove 12 surrounds all may be used for filling sealing agent, thus increases the free air space bottom pedestal 1, so that sealant effectively can fill the bottom space of pedestal 1, avoid occurring pore, improve sealing reliability.
In prior art, the cavity 3 formed after pedestal 1 is connected with housing 2 is in the vertical direction substantially in straight-tube shape, and the cavity of housing 2 has identical volume substantially with the cavity of pedestal 1, in the utility model, due to the setting of pedestal 1 bottom groove 12, the volume that groove 12 is enclosed also forms a part for cavity on pedestal 1, thus add pedestal 1 part enclose the volume of cavity, whole cavity 3 is made to present lower structure upper and lower greatly, in cavity 3 during filling sealing agent, sealant can spread towards the lower cavity that volume is relatively large, the pressure of lower cavity is sharply reduced, and then downward " attractive force " is produced to the housing 2 being in top, external pressure is made to compress downward housing 2 in other words, the housing 2 of auxiliary upper is pressed on pedestal 1 securely, improve both connection reliability, avoid Joint failure and affect sealing.
Moreover, by the step-like faying face of housing 2 and pedestal 1 to the inwall of pedestal 1, the bottom surface then arrive pedestal 1 forms circulation passage during moisture intrusion, when the bottom surface of pedestal 1 arranges groove 12, extend the volume bottom pedestal 1, form the flow pipe that " caliber " increases gradually; From capillary action, this structure is equivalent to increase caliber, to reduce the capillary force that moisture invades, thus plays certain damping action to moisture, stops moisture to invade cavity 3 further.
Wherein, the version of groove 12 is various, and it has structure and can not limit, can groove 12 ringwise, or the structure such as U-shaped groove 12, as long as can be communicated with cavity 3.
Groove 12 can be arranged along the edge of insulation spacer 4, and is divided into inside and outside according to the relation with insulation spacer 4; The bottom of insulation spacer 4 can be stretched in the inside of groove 12, outside protruding by the outward flange of insulation spacer 4, thus is communicated with cavity 3, as shown in Figure 3.
Further, the utility model can also arrange ring groove 13 in the bottom of pedestal 1, as shown in Figure 3 and Figure 5, inwall bottom pedestal 1 can be recessed, to form ring groove 13 along the circumference of pedestal 1, ring groove 13 can be communicated with cavity 3, with the passage gaps bottom extension base 1, be conducive to the filling of sealant.
In a kind of embodiment, groove 12 and ring groove 13 can be distinguished setting, as shown in Figures 2 and 3.Ring groove 13 can be arranged on the top of groove 12, groove 12 can be inwardly recessed along the bottom surface of pedestal 1, and its outer edge can not with the wall contacts of pedestal 1, only groove 12 is limited within the scope of the bottom surface of pedestal 1, and does not exceed the bottom surface of pedestal 1 or overlap with the outer edge of pedestal 1 bottom surface.Meanwhile, ring groove 13 can offering a little more than the position of pedestal 1 bottom surface or the position substantially concordant with the bottom surface of pedestal 1, and as shown in Figure 3, with the radial width bottom extension base 1, the lower cavity body 3 increasing pedestal 1 amasss.Obviously, in the present embodiment, ring groove 13 is all communicated with cavity 3 with groove 12, and three forms the packing space of whole sealant jointly, and wherein, ring groove 13 and groove 12 are interconnected by cavity 3.
In another embodiment, ring groove 13 directly can also be communicated with groove 12, as shown in Figure 4 and Figure 5.Can continue externally to outer the inwall extending to pedestal 1 directly by groove 12, then continued to stretch out by the inwall of pedestal 1, make the inwall of pedestal 1 recessed and form ring groove 13, groove 12 then on pedestal 1 bottom surface is extended to the edge of pedestal 1 bottom surface always by insulation spacer 4, then be communicated with the ring groove 13 be concavely formed by pedestal 1 inwall, form whole channel-shaped structure, to be communicated with cavity 3 one.
Adopt said structure, ring groove 13 is connected with groove 12, directly groove 12 can be extended to form ring groove 13, both are offered together, and then simplifies processing technology, reduce processing cost; When ring groove 13 is directly communicated with groove 12, there is not entity part between the two, further expanded the volume of whole groove structure, effectively increase the overall volume of cavity 3 and groove structure, namely the packing space of sealant is promoted largely; On the other hand, when ring groove 13 is directly communicated with groove 12, lower space can be increased largely, structure upper and lower greatly under both and cavity 3 are formed jointly, as mentioned above, when lower space is larger, auxiliary pressuring action can be played to housing 2, and then improve the bond strength of sealant and pedestal 1, improve the connection reliability of pedestal 1 and housing 2.
In addition, the utility model can also comprise pressure sensitive core body 5 and treatment circuit 6, as shown in Figure 2 and Figure 4, can at the bottom frit fixing seal glass 7 of pedestal 1, then intercalation guide pin 8 in seal glass 7, the lower end of guide pin 8 is connected with pressure sensitive core body 5, upper end access treatment circuit 6.
In detail, can also on treatment circuit 6 rat tail 9, and housing 2 is stretched out in the end of wire harness 9, so that wire harness 9 can be connected with external control system; The lower end of pressure sensitive core body 5 can also arrange pressure inlets 10.When pressure enters from pressure inlets 10, after pressure sensitive core body 5 senses pressure signal, be converted to electric signal, and this signal is passed to treatment circuit 6 by guide pin 8, treatment circuit 6 pairs of signals carry out amplification process and temperature compensation, then by wire harness 9, voltage signal is delivered in external control system, to realize automatically controlling by external control system.
It should be noted that, for ease of describing, cavity 3 described herein refers to the hollow cavity 3 formed after pedestal 1 is connected with housing 2, not included in the space that the channel-shaped structures such as the groove 12 that pedestal 1 is offered and ring groove 13 increase, to distinguish with both; Certainly, this difference is only for convenience, does not represent groove 12, there are barrier parts between ring groove 13 and cavity 3, and three is actually connection, and as shown in Figure 2-5, three forms the integral-filled chamber of sealant jointly.
The utility model also provides a kind of refrigeration system, and this refrigeration system comprises the pressure transducer described in above-mentioned arbitrary embodiment, to detect pressure, realizes the pressure automatic control of system.As the refrigeration system of air-conditioning, refrigerator and handpiece Water Chilling Units etc.
Certainly, pressure transducer of the present utility model can also be applied to the source pump of air-conditioning, refrigerator and handpiece Water Chilling Units etc.
Further illustrate, the parts of refrigeration system, source pump etc. are more, and the structure of all parts is all comparatively complicated, has only been described in detail its pressure transducer herein, and other are not use up part and refer to prior art, repeat no more herein.
Above refrigeration system provided by the utility model and pressure transducer thereof are described in detail.Apply specific case herein to set forth principle of the present utility model and embodiment, the explanation of above embodiment just understands core concept of the present utility model for helping.Should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also carry out some improvement and modification to the utility model, these improve and modify and also fall in the protection domain of the utility model claim.