CN2494961Y

CN2494961Y - External balance internal temperature-sensing thermal expansion valve

Info

Publication number: CN2494961Y
Application number: CN 01260199
Authority: CN
Inventors: 邓永林; 阎敏
Original assignee: 邓永林
Current assignee: Zhejiang Chunhui Intelligent Control Co Ltd
Priority date: 2001-09-24
Filing date: 2001-09-24
Publication date: 2002-06-12
Anticipated expiration: 2011-09-24

Abstract

The utility model discloses an external balance internal temperature-sensing thermal expansion valve of the evaporation compressed refrigeration equipment, which is particularly applicable to automotive air-conditioning, frequency-conversion air-conditioning and fixed-frequency air-conditioning. A cone-shape sealed loop made of non-mental material and a dish-shape spring are arranged on the upper part of a valve needle. The airproofing between a gas cavity and a liquid cavity of the external balance internal temperature-sensing thermal expansion valve is realized through the flexibility of the dish-shape spring. At the same time, the friction between the cone-shape sealed loop made of non-mental material and the valve body is small. The utility model has a good adjustment performance and sensitivity.

Description

Thermal expansion valve with external balance and internal temp sensing

The design is a kind of thermal expansion valve with external balance and internal temp sensing that is used for steam pressure type refrigerating plant, is specially adapted to air conditioning for automobiles, convertible frequency air-conditioner and fixed frequency air conditioner.

Known thermal expansion valve with external balance and internal temp sensing, the sealing between its gas, the sap cavity adopt the metal needle to cooperate with the high-accuracy of metal valve body opening, and only so still there is certain internal leakage in pipe inevitably.Because needle must keep flexible displacement in valve body hole in adjustment process, therefore, must there be slight clearance to exist between needle and the valve body hole, and the pressure of sap cavity is higher than air cavity, the liquid refrigerant of sap cavity is under action of pressure, gap evaporation around air cavity leaks and transmitting bar by metal needle and metal valve body opening, by the heat transfer of transmitting bar cold is passed to bellows, the temperature that bellows is experienced is lower than the actual temperature of the gaseous refrigerant of flowing through, cause the aperture of valve less than normal even close, so it is high that the quality of fit of needle and valve body hole requires, difficulty of processing is very big.

It is almost nil and regulate the sensitive thermal expansion valve with external balance and internal temp sensing processed of being easy to again that the design's task provides a kind of internal leakage.

Following technical scheme can be finished the task that the design proposes.

Known thermal expansion valve with external balance and internal temp sensing is by bellows, transmit bar, valve body, needle, steel ball, compositions such as spring, the design is characterised in that a conical seal ring and a disk spring are arranged at needle top, the cylindrical of conical seal ring contacts with the valve body macropore, effect at disk spring is issued to radial seal, conical seal ring top compresses the annular end face of needle and conical seal ring and disk spring to reach axial seal, guarantee the concentricity and the perpendicularity of conical seal ring and valve body macropore by certain length of fit of needle and valve body aperture by the pressure that screws of clamp nut.Conical seal ring is nonmetallic materials.

Accompanying drawing has been described the design's a embodiment, and the design is further described.

Fig. 1 is the cutaway view of thermal expansion valve with external balance and internal temp sensing;

Fig. 2 is the cutaway view of conical seal ring;

Fig. 3 is a refrigerating system figure.

Shown in Figure 1:

1, bellows 2, valve body 3, transmission bar 4, clamp nut 5, disk spring 6, conical seal ring 7, needle 8, valve seat 9, steel ball 10, steel ball seat 11, spring.

Thermal expansion valve with external balance and internal temp sensing shown in Figure 1, liquid refrigerant enters the bottom of valve from inlet, circular passage throttling expansion between steel ball 9 and valve seat 8, flow to conical seal ring 5 and radial seal place of valve body 2 macropores and the annular end face and the conical seal ring 5 of needle 7 by the fit clearance between needle 7 and valve body 2 apertures, axial seal place of disk spring 6, because the sealing function at above-mentioned two places, make liquid refrigerant can not flow into the air cavity on valve top, thereby assurance bellows 1 can be experienced the actual temperature that enters the gaseous refrigerant of air cavity from air inlet, makes the aperture of valve remain on analog value.

Shown in Figure 3:

31, compressor 32, condenser 33, dry reservoir 34, thermal expansion valve with external balance and internal temp sensing 35, evaporimeter.

Its course of work is: the gaseous refrigerant after compressed machine 31 compressions enters dry reservoir 33 through condenser 32 condensations becoming liquid refrigerant, liquid refrigerant enters wherein by the inlet of thermal expansion valve with external balance and internal temp sensing 34 bottoms, enter evaporimeter 35 evaporations through throttling expansion, gaseous refrigerant after the evaporation enters through the air inlet on thermal expansion valve with external balance and internal temp sensing 34 tops, make bellows experience the temperature of gaseous refrigerant, get back to compressor 31 from the gas outlet outflow on top and finish circulation.When the load of evaporimeter 35 reduces, the temperature of gaseous refrigerant of thermal expansion valve with external balance and internal temp sensing 34 of flowing through decreases, the temperature that bellows 1 is experienced is also along with decline, pressure in the bellows 1 is along with reduction, steel ball 9 under the effect of spring 11, needle 7, conical seal ring 5 and transmission bar 3 are to top offset, circular passage sectional area between steel ball 9 and the valve seat 8 reduces, the liquid refrigerant that enters evaporimeter 35 reduces, otherwise, when the load of evaporimeter 35 increases, the flow through gaseous refrigerant increase in temperature of thermal expansion valve with external balance and internal temp sensing 34, the temperature that bellows 1 is experienced rises, pressure in the bellows 1 increases, and the liquid refrigerant that enters evaporimeter 35 is increased.

As mentioned above, thermal expansion valve with external balance and internal temp sensing 34 needle 7, conical seal ring 5 etc. in adjustment process will produce displacement, should have excellent sealing performance between sap cavity and the air cavity simultaneously, otherwise will be as previously mentioned, make bellows 1 can not experience the actual temperature of gaseous refrigerant, cause aperture less than normal or close, make the refrigeration system cisco unity malfunction.

Among the embodiment shown in the design, the conical seal ring 5 that nonmetallic materials are made is under the effect of disk spring 6, not only can guarantee the sealing property between gas, the sap cavity but also can guarantee that conical seal ring 5 moves flexibly along valve body 2 macropores in the adjustment process, make bellows 1 can experience the actual temperature of the gaseous refrigerant of flowing through, guarantee the operate as normal of refrigeration system and the raising of efficient.

Claims

1, a kind of thermal expansion valve with external balance and internal temp sensing is made up of bellows, transmission bar, valve body, needle, steel ball, spring etc., and the design is characterised in that: a conical seal ring and a disk spring are arranged at needle top.

2, thermal expansion valve with external balance and internal temp sensing according to claim 1, its feature are that also conical seal ring is nonmetallic materials.