CN209264127U - A kind of sealing structure of thermocouple output end - Google Patents

Abstract

The utility model discloses a kind of sealing structures of thermocouple output end, it is characterized in that, including the end cap and cavity being coupled, the inside of the end cap and cavity forms the cavity for accommodating thermocouple output end, first through hole is provided on the end cap, the hot end of the thermocouple is stretched out outside the end cap by the first through hole, the second through-hole is provided on the cavity, the lead-out wire of the thermocouple is stretched out outside the cavity by second through-hole, the pressure gauge for detecting the cavity pressure is provided on the cavity, it is sealed between the end cap and the cavity by the first sealing structure, it is sealed between the thermocouple and the end cap by second seals structure, it is sealed between the lead-out wire of the thermocouple and the cavity by third sealing structure, the beneficial effects of the utility model are: passing through multi-sealed knot Structure realizes effective sealing to thermocouple output end.

Description

A kind of sealing structure of thermocouple output end

Technical field

The utility model relates to temperature sensor technology fields, more particularly to a kind of sealing structure of thermocouple output end.

Background technique

Thermocouple is common temperature element in temperature measuring instrument, it directly measures temperature, and temperature signal is converted At thermo-electromotive force signal, the temperature of measured medium is converted by electric meter.Thermocouple is stable with performance, structure is simple, Using the features such as safety and low cost, temperature-measuring range is wide, it is widely used in the fields such as Industry Control, petrochemical industry.

The installation of TC need to be isolated its output end (terminals), especially high temperature, high pressure when measurement equipment to be checked Or in the detection environment of high humility, if do not carried out closed, isolation to output end, biggish safety can be generated in use Hidden danger.

Utility model content

In view of the above technical problems, the purpose of the utility model is to provide a kind of sealing structures of thermocouple output end, lead to It crosses multi-sealing structure effectively to seal the output end of thermocouple, overcomes above-mentioned the deficiencies in the prior art.

In order to achieve the above objectives, the technical solution that the utility model uses is: providing a kind of thermocouple output end Sealing structure, which is characterized in that including the end cap and cavity being coupled, the end cap and inside cavity are formed for accommodating heat The cavity of the output end of galvanic couple is provided with first through hole on the end cap, and the hot end of the thermocouple passes through the first through hole It stretches out outside the end cap, the second through-hole is provided on the cavity, the lead-out wire of the thermocouple is stretched by second through-hole Out outside the cavity, the pressure gauge for detecting the cavity pressure, the end cap and the cavity are provided on the cavity Between by the first sealing structure seal, between the thermocouple and the end cap by second seals structure sealing, the heat It is sealed between the lead-out wire of galvanic couple and the cavity by third sealing structure.

Preferably, first sealing structure includes the first boss being arranged on the end cap, the first boss Circumferentially arranged first external screw thread in periphery, the lower part of the cavity inner wall are provided in first cooperated with first external screw thread Screw thread, the cavity are installed in the first boss by first internal screw thread and the first external screw thread.

Preferably, the second seals structure is bite type sealing structure, the including being set to the end cap upper surface Two boss and the first cutting ferrule being sheathed on the thermocouple, the center of the second boss correspond to first through hole and are arranged the Three through-holes, circumferentially arranged second external screw thread in periphery of the second boss correspond to third through-hole on first cutting ferrule and are arranged Fourth hole, the hot end of the thermocouple passes sequentially through fourth hole, third through-hole and first through hole and is pierced by the end cap, described The inner wall of first cutting ferrule is provided with the second internal screw thread with second external screw thread cooperation, the second boss and the first cutting ferrule it Between the first elastic seal ring is set, by first cutting ferrule is tightened in the second boss can be achieved the thermocouple with The sealing of the end cap upper surface.

Preferably, the thermocouple is mounted on measurement equipment to be checked by the end cap, is arranged on the measurement equipment to be checked Thermocouple mounting hole, the hot end of the thermocouple be inserted into after the thermocouple mounting hole by bite type sealing structure and it is described to Detection device sealing, the medial surface of the measurement equipment to be checked are arranged third boss, the center setting of the third boss with it is described The fourth hole of thermocouple mounting hole connection, the circumferentially arranged third external screw thread in periphery of the third boss, the thermocouple Hot end insertion fourth hole after be arranged the second cutting ferrule of one with third boss cooperation, the second cutting ferrule inner wall is arranged There is the third internal screw thread with the cooperation of third external screw thread, the second elastic seal ring be set between second cutting ferrule and third boss, The sealing of the thermocouple Yu the measurement equipment to be checked can be achieved on the third boss by the way that second cutting ferrule to be tightened in.

Preferably, threaded mounting hole is set on the end cap, and the end cap is installed on measurement equipment to be checked by bolt.

Preferably, the third sealing structure includes explosion-proof gland head, and the lead-out wire of the thermocouple passes through described explosion-proof Gland head is installed on the second through-hole.

Preferably, control valve is installed between the cavity and the pressure gauge.

Preferably, first elastic seal ring and the second elastic seal ring are carbon seal ring.

The beneficial effects of the utility model are: realizing effective sealing to thermocouple output end by multi-sealing structure.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of one preferred embodiment of the utility model；

Specific embodiment

The preferred embodiment of the utility model is described in detail with reference to the accompanying drawing, so that the advantages of the utility model It can be easier to be readily appreciated by one skilled in the art with feature, to make the protection scope of the utility model apparent clear Define.

Referring to Fig. 1, the utility model embodiment includes:

A kind of sealing structure of thermocouple output end, including the end cap 2 and cavity 3 being coupled, the end cap 2 and cavity 3 inside form the cavity for accommodating the output end 101 of thermocouple, are provided with first through hole, the thermocouple on the end cap 2 Hot end 102 stretched out outside the end cap 2 by the first through hole, the second through-hole, the thermocouple are provided on the cavity 3 Lead-out wire 103 stretched out outside the cavity 3 by second through-hole, be provided on the cavity 3 for detecting the cavity The pressure gauge 6 of pressure, installs control valve 7 between the cavity 3 and the pressure gauge 6, the end cap 2 and the cavity 3 it Between sealed by the first sealing structure, first sealing structure includes the first boss being arranged on the end cap 2, described the Circumferentially arranged first external screw thread in periphery of one boss, the lower part of 3 inner wall of cavity is provided with matches with first external screw thread The first internal screw thread closed, the cavity 3 are installed in the first boss by first internal screw thread and the first external screw thread, institute It states and is sealed between thermocouple and the end cap 2 by second seals structure, the second seals structure is bite type sealing structure, Including being set to the second boss of 2 upper surface of end cap and the first cutting ferrule 4 being sheathed on the thermocouple, described second is convex The center of platform corresponds to first through hole setting third through-hole, circumferentially arranged second external screw thread in periphery of the second boss, Corresponded on first cutting ferrule 4 third through-hole setting fourth hole, the hot end 102 of the thermocouple pass sequentially through fourth hole, Third through-hole and first through hole are pierced by the end cap 2, and the inner wall of first cutting ferrule 4 is provided with to be cooperated with second external screw thread The second internal screw thread, first elastic seal ring is set between the second boss and the first cutting ferrule 4, by by first cutting ferrule 4 are tightened in the sealing that the thermocouple Yu the end cap 2 can be achieved in the second boss, install the to be detected of the thermocouple Thermocouple mounting hole is set in equipment 8, the thermocouple be inserted into after measurement equipment 8 to be checked by bite type sealing structure with it is to be detected Equipment 8 is sealed, and the third boss including being set to 8 medial surface of measurement equipment to be checked, the center of the third boss is set Set the fourth hole being connected to the thermocouple mounting hole, the circumferentially arranged third external screw thread in periphery of the third boss, institute Second cutting ferrule 9 cooperated with third boss, second cutting ferrule are arranged after stating the insertion of hot end 102 fourth hole of thermocouple 9 inner walls are provided with the third internal screw thread with the cooperation of third external screw thread, and the second bullet is arranged between second cutting ferrule 9 and third boss Property sealing ring, can be achieved the thermocouple and measurement equipment 8 to be checked by the way that second cutting ferrule 9 to be tightened on the third boss Sealing, sealed between the lead-out wire 103 and cavity 3 of the thermocouple by third sealing structure, the third sealing structure Including explosion-proof gland head 5, the lead-out wire 103 of the thermocouple is installed on the second through-hole by the explosion-proof gland head 5.

The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in Other related technical areas are also included in the patent protection scope of the utility model.

Claims (9)

1. a kind of sealing structure of thermocouple output end, which is characterized in that including the end cap and cavity being coupled, the end cap The cavity for accommodating the output end of thermocouple is formed with inside cavity, first through hole, the thermoelectricity are provided on the end cap Even hot end is stretched out outside the end cap by the first through hole, and the second through-hole is provided on the cavity, the thermocouple Lead-out wire is stretched out outside the cavity by second through-hole, and the pressure for detecting the cavity pressure is provided on the cavity Power table is sealed by the first sealing structure between the end cap and the cavity, is passed through between the thermocouple and the end cap Second seals structure sealing, is sealed between the lead-out wire of the thermocouple and the cavity by third sealing structure.

2. a kind of sealing structure of thermocouple output end according to claim 1, which is characterized in that the first sealing knot Structure includes the first boss being arranged on the end cap, and circumferentially arranged first external screw thread in periphery of the first boss is described The lower part of cavity inner wall is provided with the first internal screw thread with first external screw thread cooperation, and the cavity passes through spiral shell in described first Line and the first external screw thread are installed in the first boss.

3. a kind of sealing structure of thermocouple output end according to claim 1, which is characterized in that the second sealing knot Structure is bite type sealing structure, including be set to the second boss of the end cap upper surface and be sheathed on the thermocouple the One cutting ferrule, the center of the second boss correspond to first through hole setting third through-hole, and the periphery of the second boss is along week To the second external screw thread is arranged, third through-hole setting fourth hole is corresponded on first cutting ferrule, the hot end of the thermocouple is successively It is pierced by the end cap by fourth hole, third through-hole and first through hole, the inner wall of first cutting ferrule is provided with and described Two external screw threads cooperation the second internal screw thread, the first elastic seal ring is set between the second boss and the first cutting ferrule, pass through by First cutting ferrule is tightened in the sealing that the thermocouple Yu the end cap upper surface can be achieved in the second boss.

4. a kind of sealing structure of thermocouple output end according to claim 1, which is characterized in that the thermocouple passes through The end cap is mounted on measurement equipment to be checked, and thermocouple mounting hole, the hot end of the thermocouple are arranged on the measurement equipment to be checked It is sealed after being inserted into the thermocouple mounting hole by bite type sealing structure and the measurement equipment to be checked, the measurement equipment to be checked Third boss is arranged in medial surface, and the fourth hole being connected to the thermocouple mounting hole, institute is arranged in the center of the third boss State the circumferentially arranged third external screw thread in periphery of third boss, be arranged after the hot end insertion fourth hole of the thermocouple one with Second cutting ferrule of the third boss cooperation, the second cutting ferrule inner wall are provided with and spiral shell in the third of third external screw thread cooperation The second elastic seal ring is arranged between second cutting ferrule and third boss in line, described by the way that second cutting ferrule to be tightened in The sealing of the thermocouple Yu the measurement equipment to be checked can be achieved on third boss.

5. a kind of sealing structure of thermocouple output end according to claim 1, which is characterized in that be arranged on the end cap Threaded mounting hole, the end cap are installed on measurement equipment to be checked by bolt.

6. a kind of sealing structure of thermocouple output end according to claim 1, which is characterized in that the third sealing knot Structure includes explosion-proof gland head, and the lead-out wire of the thermocouple is installed on the second through-hole by the explosion-proof gland head.

7. a kind of sealing structure of thermocouple output end according to claim 1, which is characterized in that the cavity with it is described Control valve is installed between pressure gauge.

8. a kind of sealing structure of thermocouple output end according to claim 3, which is characterized in that first elasticity is close Seal is carbon seal ring.

9. a kind of sealing structure of thermocouple output end according to claim 4, which is characterized in that second elasticity is close Seal is carbon seal ring.