JPH04131737U - consumable thermocouple - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate the work of inserting a U-shaped tube into a housing with a thermocouple wire inserted therein, and to use only a small amount of refractory cement to fix the U-shaped tube. In particular, there is provided a consumable thermocouple which eliminates the possibility that both ends of the thermocouple wire may be short-circuited to each other within the housing. [Structure] The housing has a pair of through holes opened independently from each other, and each through hole has a U-shaped tube receiving hole and a support pin insertion hole communicating with each other, and the receiving hole A stopper member capable of supporting the end of the U-shaped tube is formed in the communicating portion of the through-hole, and an insulation guaranteeing portion is formed of an insulating heat-resistant material forming a housing between the pair of through-holes.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is a consumable heating device for measuring the temperature of molten metal by immersing it in molten metal. Regarding electrocouples.

0002

[Conventional technology]

Generally, conventional consumable thermocouples are made of a platinum-platinum rhodium alloy, as shown in Figure 6. Both ends of a quartz glass U-shaped tube 2 into which a thermocouple wire 1 made of gold or the like is inserted are connected to a housing. by inserting it into the internal space 4 of the cement 3 and filling the internal space 4 with the refractory cement 5. The U-shaped tube 2 is fixed in place.

0003 At this time, the lead-out ends 1a, 1a of the thermocouple wire 1 are connected to the support pins 7, 7. The support pins 7, 7 are connected to a synthetic resin connector connected to the housing 3. The refractory cement 5 is inserted through the insertion holes 9, 9 of the tar member 8, and the refractory cement 5 is passed through the inner space 4. By filling the insertion holes 9, 9 with the support pins 7, 7, the support pins 7, 7 can be fixed. I'm looking forward to it.

0004 The connector member 8, together with the housing 3, includes a protective tube 1 made of a paper tube. 0, and a plug provided at the tip of the holder (not shown) is inserted into the connector member 8. The plug can be attached and detached freely. Note that the tip of the housing 3 has a slag layer passing through it. Sometimes a metal melting cap 11 is attached to protect the thermocouple wire 1 and the U-shaped tube 2. Ru.

[0005]

[Problem that the idea aims to solve]

In the conventional consumable thermocouple described above, a U-shaped tube into which the thermocouple wire 1 is inserted is used. 2 to the housing 3, both ends of the U-shaped tube 2 are inserted into the internal space of the housing 3. The refractory cement 5 must be filled while the space 4 is held in place, and the operation work is difficult. Moreover, during curing until the refractory cement 5 is dried and solidified, Care must be taken to prevent the U-shaped tube 2 from moving in the cement due to external force, and The work is complicated.

[0006] In addition, when using alumina cement as the fireproof cement 5, the internal cavity It took a whole day and night to dry and cure the relatively large amount of cement that was filled in the There is a problem in terms of productivity.On the other hand, when using self-hardening zirconia cement, Workability can be improved without the need for dry curing, but it is generally expensive, so it is relatively difficult to If a large amount of cement is filled into the large internal space 4, the cost will be reduced. There is a problem with this.

[0007] Moreover, in the case of the zirconia cement mentioned above, it is highly reliable in terms of electrical insulation. Therefore, there is a risk that the lead-out ends 1a, 1a of the thermocouple wire 1 may be short-circuited through the cement. Therefore, it is not appropriate. On the other hand, in the case of the alumina cement mentioned above, dry curing is perfect. If so, electrical insulation can be expected, but in the unlikely event that moisture is trapped in the cement due to insufficient curing. If it remains, the drawn out ends 1a, 1a of the thermocouple element wire 1 may be easily short-circuited. There are some problems.

[0008] Furthermore, in conventional consumable thermocouples, the housing 3 is molded from synthetic resin. However, in the case of such synthetic resin housings, when immersed in molten metal, , the flange portion of the housing protruding from the tip of the protection tube 10 suddenly melts and burns. Because burning gas is generated and a so-called boiling phenomenon occurs near the U-shaped pipe 2, measurement is not possible. There is a problem of loss of temperature accuracy.

[0009]

[Means to solve the problem]

The present invention provides a consumable thermocouple that solves all of the conventional problems mentioned above. It is something that

0010 Therefore, the first method of this invention is to insert the thermocouple wire through the Insert both ends of the U-shaped tube into a housing made of insulated heat-resistant material, and attach the thermocouple wire to the housing. Connect the port pin and insert the support pin into the protection tube together with the housing. In a consumable thermocouple comprising: Has a pair of through holes, each through hole communicates the U-shaped tube receiving hole and the support pin insertion hole. In addition, the end of the U-shaped tube can be supported at the communication portion between the receiving hole and the insertion hole. A stopper portion with a function of The electrical insulation guarantee section is made of an insulating heat-resistant material.

[0011] In addition, the second means of the present invention is that the thermocouple wire is inserted into the U Insert both ends of the tube into a housing made of insulated heat-resistant material, and attach the support to the thermocouple wire. connects the support pin, holds the support pin, and includes the support pin. A resin cylindrical body constituting the connector is connected to the housing, and the cylindrical body is attached to the housing. In a consumable thermocouple that is inserted into a protective tube together with a housing, the housing is , has a pair of through holes that are opened independently of each other, and each through hole has a U-shaped tube receiving hole and The insertion hole of the support pin is configured to communicate with the insertion hole, and the communication portion between the receiving hole and the insertion hole is configured to communicate with the insertion hole of the support pin. constitutes a stopper part that can support the end of the U-shaped tube, and the pair of through holes The electrical insulation guarantee part is constructed by the insulating heat-resistant material that constitutes the housing between the parts. The cylindrical body is a cup that forms a hollow heat insulating space around the outer periphery of the support pin. The main feature is that it comprises a tap part.

0012

【Example】

Embodiments of the present invention will be described in detail below based on the drawings.

[0013] (First example) In the first embodiment shown in FIGS. 1 and 2, the housing 21 is made of ceramic or the like. It is made of a material that is electrically insulating and heat resistant, and is formed into a block shape. , and a flange 23 at the tip of the main body 22.

[0014] This housing 21 has a pair of through holes 24, 24 opened independently of each other. Each through hole 24 has a large diameter receiving hole 24a that opens at the distal end surface of the housing 21. and a small-diameter insertion hole that communicates with the receiving hole 24a and opens at the rear end surface of the housing 21. 24b. In the case of this first embodiment, the receiving hole 24a and the insertion hole 24b are In the stepped portions of different diameters, which are arranged with their centers offset from each other and which make both holes 24a and 24b communicate with each other. This constitutes a stopper portion 24c which will be described later.

[0015] A cylindrical body 25 is connected to the tail end of the housing 21, and the cylindrical body 25 is made of synthetic resin. A cup portion 26 and a cylindrical sleeve extending to the rear of the cup portion 26 are made of resin. The portion 27 is integrally molded. In the case of the illustrated example, the outer diameter of the cup portion 26 is It has approximately the same diameter as the outer diameter of the main body 22 of the housing, and has a cutter at the rear end of the main body 22 of the housing. It has a stepped convex seat 28 that is fitted into the opening edge of the tap portion 26.

[0016] The U-shaped tube 30 into which the thermocouple wire 29 is inserted is made of quartz tube. The ends are inserted into the receiving holes 24a, 24a of the housing 21.

[0017] The lead-out ends 29a, 29a of the thermocouple wire 29 are connected to support pins 32, 32. Then, each support pin 32 is inserted into the insertion hole 24b. This support pin 3 2 is also made of the same material as before, i.e. copper nickel conductor wire or pure copper conductor wire, and The drawn-out ends 29a, 29 of the thermocouple wire are attached to the flat part formed at the tip of the port pin 32. A is inserted into the insertion hole 24b with wires connected by spot welding etc., and each support The pin 32 is extended to the rear of the housing 21.

[0018] The rear extension portions of the support pins 32, 32 are the cup portions of the resin cylindrical body 25. 26 and is inserted through the through hole 33 formed at the bottom of the cup portion 26. It reaches the tube section 27. The rear extension portion 32a of one of the support pins 32 is a sleeve portion. 27 is fitted into a shallow groove 34a formed along the axial direction on the outer surface of the A bent portion that is bent so as to hold the rear end of the sleeve portion 27 at the rear end of the extension portion 32a. It has a section 35a. The rear extension portion 32b of the other support pin 32 is similarly The sleeve portion 27 is fitted into a shallow groove 34b formed on the outer surface of the sleeve portion 27. 7 from the rear end so as to hold the terminal end of the slit 36 formed in the shape of a notch. It has a bent portion 35b. Therefore, the bent portions 35a and 35b of the support pin A connector 37 is constituted by the sleeve portion 27 and the sleeve portion 27, and the connector has a holder (see Fig. A plug provided at the tip (not shown) is removably fitted.

[0019] When attaching the U-shaped tube 30 to the housing 21, both ends of the U-shaped tube 30 are are inserted into the receiving holes 24a, 24a. At the time of this insertion, place both ends of the U-shaped tube 30 with a stopper. Since it can be supported by the - portions 24c, 24c, positioning is easy.

[0020] When the U-shaped tube 30 is inserted, it is connected to the lead-out ends 29a, 29a of the thermocouple wire 29. The support pins 32, 32 are inserted into the insertion holes 24b, 24b. in this state , the through holes 24, 24 are filled with refractory cement 38. The fireproof cement 38 is It spreads from the receiving hole 24a to the insertion hole 24b and is dried and solidified. Therefore, the U-shaped tube 30 Both ends are securely held fixed within the receiving hole 24a by refractory cement 38. Moreover, the tip of the support pin 32 is a refractory material that has thinly flowed into the insertion hole 24b and solidified. It is fixedly held by cement 38. At this time, compared to the conventional structure, fireproof cement Since the filling amount of 38 is as small as possible, it is possible to use an expensive refractory cement 38. Even with the use of zirconia cement, the cost increase is negligible.

[0021] As mentioned above, the through holes 24, 24 are opened in the housing 21 independently of each other. Therefore, the housing 21 is formed between the pair of through holes 24, 24. The electrical insulation guarantee part 39 is made of an insulating heat-resistant material, for example, a ceramic material in the case of the example shown. is forming. Therefore, the lead-out ends 29a, 29a of the thermocouple wire 29 are connected to each other, and the pair The support pins 32, 32 are short-circuited at least within the through holes 24, 24. There is no risk of being forced to do so.

[0022] For this reason, for example, as the refractory cement 38, ceramics with poor electrical insulation properties may be used. There is no problem with short circuits even when using When using alumina cement, etc. that requires dry curing, in the unlikely event that curing is insufficient. Even if moisture remains, there is no risk of short circuit.

[0023] Therefore, the housing 21 and the cylindrical body 25 set as described above are attached to the paper tube. The protective tube 40 is inserted and fixed. At this time, the cup portion 26 of the cylindrical body 25 and The main body 22 of the housing 21 is adapted to the inner periphery of the protective tube 40, and the housing 2 One flange 23 is adapted to the tip of the protection tube 40. Furthermore, the housing 21 At the tip, there is a melting cap that protects the thermocouple wire 29 and the U-shaped tube 30 when passing through the slag layer. A cap 41 is attached.

[0024] According to the above configuration, the cup portion 26 of the cylindrical body 25 has a pair of support pins 32. , 32 is formed with a hollow heat insulating space 42. Therefore, when immersed in molten metal In this case, the heat transferred from the protection tube 40 to the cylindrical body 25 is directly transferred to the support pin 32. The heating of the support pin 32 can be prevented as much as possible. others Compensation of the support pin 32 and thermocouple wire 29 due to heating of the support pin 32 Temperature rise at the contact portion can be prevented as much as possible, and disturbances in temperature measurement accuracy can be prevented.

[0025] (Second example) In the second embodiment shown in FIG. 3, a pair of through holes are formed in the housing 21. 24, another configuration for 24 is shown. Therefore, for other configurations, It is similar to the first embodiment described above based on FIGS. 1 and 2, and is indicated by the same reference numerals. Therefore, the explanation will be omitted.

[0026] In the first embodiment, as shown in FIG. 2(B), one of the through holes 24 is A row of receiving holes 24a and insertion holes 24b and a row of receiving holes 24a and insertion holes of the other through hole 24. The rows of through holes 24b are all arranged in a line on the diameter line of the housing 21. Although the configuration is illustrated, in this second embodiment, as shown in FIG. 3(B), one of the through holes is The rows of receiving holes 24a and insertion holes 24b of the holes 24 are arranged on one side of the diameter line of the housing 21. The receiving hole 24a of the other through hole 24 and the insertion hole 2 4b with a phase of 1 relative to the center of the housing 21 with respect to the one through hole 24. They are arranged parallel to each other and deviated from each other by 80 degrees to the other side of the diameter line.

[0027] Therefore, according to the configuration of the second embodiment, compared to the configuration of the first embodiment, It is now possible to reduce the diameter of the housing 21, making the device more compact. This is advantageous when

[0028] (Third example) The third embodiment illustrated in FIG. 4 corresponds to the cylindrical body 25 in the first embodiment described above. It does not have any members to do so. In addition, this third embodiment has a housing as shown in FIG. 4(B). The through hole 24 of the ring 21 has a small diameter insertion hole 2 within the circumference of the large diameter receiving hole 24a. 4b is placed. Therefore, regarding other configurations, please refer to Figures 1 and 2. It is the same as the first embodiment described above and is indicated by the same reference numeral, so the explanation will be omitted. do.

[0029] In this third embodiment, a refractory cement 38 is inserted into the insertion hole 24b of the housing 21. The support pins 32, 32 fixedly held via the rear extensions 32a, 32b is extended straight, and compensation conductors 43, 43 are connected to the extended ends. For this reason By making the cylindrical body 25 described above unnecessary, the entire device can be manufactured at low cost. I can do that.

[0030] (Fourth example) In the first to third embodiments described above, the housing 21 is directly inserted into the protection tube 40. However, in the fourth embodiment shown in FIG. It is indirectly inserted into the tube 40 via an adapter 44.

[0031] That is, FIG. 5(A) shows a case with a cylindrical body 25 as in the first and second embodiments. An embodiment in which the housing 21 is inserted into a large-diameter protection tube 40 via an adapter 44 is shown. FIG. 5(B) shows a housing 2 without a cylindrical body as in the third embodiment. 1 is inserted into a large-diameter protection tube 40 via an adapter 44.

[0032] In both cases of FIGS. 5(A) and 5(B), the adapter 44 is made of heat-resistant material such as ceramic. A hole 45 is molded from the housing 21 into which the main body 22 of the housing 21 is inserted, and the housing 2 1 and a recess 46 for receiving the flange 23 of the housing. 21 is fixed with fireproof cement 47.

[0033] According to this fourth embodiment, the device of the present invention including the housing 21 can be made of a specific size. Even if it is uniformly prepared as a Since it can be inserted into all types of protective tubes 40, the versatility of the device of the present invention is enhanced. It has the advantage of being achievable.

[0034]

[Effect of the idea]

According to the present invention as set forth in claim 1, the through holes 24, 24 of the housing 21 are mutually connected. The receiving hole 24a of the U-shaped tube 30 and the insertion hole 24 of the support pin 32 are opened independently. Since the structure is formed by communicating with the refractory cement 38 As a result, it is possible to use as little amount as possible, resulting in low cost and fireproof cement. Even if dry curing of 38 times is required, productivity can be improved by shortening the curing period. Wear.

[0035] Moreover, the end of the U-shaped tube 30 is supported in the communication portion between the receiving hole 24a and the insertion hole 24b. Since the stopper portion 24c that allows the U-shaped tube 30 to be inserted into the receiving hole 24 is formed. When inserting the fireproof cement into the hole and fixing it by filling it with the refractory cement 38, By positioning the U-shaped tube 30 using the upper part 24c, the work is made easier. You can make it look like that.

[0036] Furthermore, a housing 21 is formed between the pair of independent through holes 24, 24. Since the electrical insulation guarantee part 39 is formed of an insulating heat-resistant material, Even if the thermocouple wire 38 is not reliable in terms of electrical insulation, the lead-out end of the thermocouple wire 29 There is a risk of short circuit between 29a and 29a and between support pins 32 and 32. However, it is possible to provide a highly reliable device. As a result, various fire-resistant cement It is advantageous in that it expands the selection range from the Even when using fire cement, it is not necessary to ensure complete curing. , which is advantageous in that productivity can be improved.

[0037] Furthermore, since the housing 21 is made of an insulating and heat-resistant material, it can be replaced with a conventional synthetic resin material. Unlike housings, boiling does not occur when immersed in molten metal, and it is safe. You can expect highly accurate temperature measurement results.

[0038] According to the present invention as set forth in claim 2, in addition to the above effects, the connector 37 has A resin cylindrical body 25 forms a hollow heat insulating space around the support pins 32, 32. 42, so that when immersed in the molten metal, the outside The conduction of heat from the cup portion 26 to the support pins 32, 32, which is heated by the cup portion 26, is prevented as much as possible. By stopping the support pins 32, 32, the support pins and the thermocouple wire are heated. It is possible to prevent temperature rise at the connection part with 29, resulting in highly accurate and stable temperature measurement. You can expect fruit.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 shows a housing used in the first embodiment of the present invention, in which (A) is a perspective view of the housing and a cylindrical body, and (B) is a bottom view of the housing.

FIG. 3 shows a second embodiment of the present invention, in which (A) is a longitudinal sectional view showing the whole, and (B) is a bottom view of the housing.

FIG. 4 shows a third embodiment of the present invention, in which (A) is a longitudinal sectional view showing the whole, and (B) is a bottom view of the housing.

FIG. 5 shows a fourth embodiment of the present invention, (A) is a longitudinal sectional view showing an example in which the device of the first or second embodiment is inserted into a protection tube via an adapter, (B) FIG. 7 is a longitudinal cross-sectional view showing an example in which the device of the third embodiment is inserted into a protection tube via an adapter.

FIG. 6 is a vertical cross-sectional view showing a conventional structure.

[Explanation of symbols]

21 Housing 24 Through hole 24a Receiving hole 24b Insertion hole 24c Stopper part 25 Cylindrical body 26 Cup part 29 Thermocouple wire 30 U-shaped tube 32 Support pin 32a Rear extension 32b Rear extension 37 Connector 38 Fireproof cement 39 Electrical Insulation Guarantee Department 40 Protection tube 44 Adapter

Claims (2)

[Scope of utility model registration request] 1. Both ends of a U-shaped tube into which a thermocouple wire has been inserted are inserted into a housing made of an insulating and heat-resistant material, a support pin is connected to the thermocouple wire, and the support pin is attached to the protective tube together with the housing. In the expendable thermocouple, the housing has a pair of through holes opened independently from each other, and each through hole communicates with a U-shaped tube receiving hole and a support pin insertion hole. At the same time, a stopper part that can support the end of the U-shaped tube is formed in the communication part between the receiving hole and the insertion hole, and electrical insulation is provided between the pair of through holes by an insulating and heat-resistant material that forms the housing. A consumable thermocouple comprising a guarantee part. 2. Both ends of a U-shaped tube into which the thermocouple wire is inserted are inserted into a housing made of an insulated heat-resistant material, a support pin is connected to the thermocouple wire, and the support pin is held and the A consumable thermocouple, in which a resin cylindrical body including a support pin and constituting a connector is connected to the housing, and the cylindrical body is inserted into a protection tube together with the housing, wherein the housings are independent of each other. The receiving hole of the U-shaped tube and the insertion hole of the support pin are configured to communicate with each through hole. A stopper portion capable of supporting the end portion is configured, and an electrical insulation guarantee portion is configured by an insulating and heat-resistant material constituting a housing between a pair of through holes, and the cylindrical body is hollow around the outer periphery of the support pin. A consumable thermocouple characterized by comprising a cup portion that forms a heat-insulating space having a shape.