CN210670610U - Heating pipe and rail vehicle sanding system - Google Patents

Abstract

The utility model provides a heating pipe and rail vehicle sanding system, the heating pipe comprises a pipe body and a first insulating layer wrapped outside the pipe body, and a heating assembly is sleeved on the outer wall of the first insulating layer; a thin-walled tube is sleeved outside the heating assembly, an accommodating cavity is formed between the thin-walled tube and the heating assembly, a front end plug and a rear end plug are respectively arranged at the front end and the rear end of the accommodating cavity, and magnesium oxide powder is filled in the accommodating cavity; the rail vehicle sanding system comprises the heating pipe. Heating pipe, set gradually first insulation layer, heating element and magnesia powder from inside to outside between body and thin wall pipe, strengthened the resistance to pressure and the insulating nature of heating pipe greatly to improve safety in utilization and prolonged the life of heating pipe, also satisfied the heating pipe and used in severe cold environment, improved rail vehicle sanding system's security greatly.

Description

Heating pipe and rail vehicle sanding system

Technical Field

The utility model relates to a heating device technical field particularly, relates to a heating pipe and rail vehicle sanding system.

Background

When the locomotive is in operation, such as in rainy and snowy days and other weather, the friction force between the wheels of the locomotive and the track can be reduced, at the moment, the locomotive can sand grains are sprayed to the track by using the structures of the sand sprayer and the sand spraying heater, so that the friction force between the wheels of the locomotive and the track is increased, and the braking effect of the locomotive is improved. However, when the locomotive is in a severe cold area, the sand outlet can be frozen in severe cold weather, so that sand cannot be blown out, and at the moment, the sanding system needs to be heated for deicing to ensure the normal operation of the sanding system.

The heating pipe of the sanding heater generally adopts a resistance wire mode for heating, and the distance between the resistance wire of the heating pipe and the inner wall of the stainless steel sheath is very limited due to the limitation of the shape structure and the size. However, the heating tube in the prior art is affected by the distance and the size, so that the voltage resistance and the insulation performance of the heating tube are limited to a certain extent, the voltage resistance value and the insulation performance are not high, and the heating tube cannot meet the use requirement in a severe cold environment.

SUMMERY OF THE UTILITY MODEL

The utility model provides a problem that heating pipe withstand voltage value and insulating properties are not high.

In order to solve at least one of the above problems, the present invention firstly provides a heating pipe, which comprises a pipe body and a first insulating layer wrapped outside the pipe body, wherein a heating assembly is sleeved on an outer wall of the first insulating layer; the heating assembly is sleeved with a thin-walled tube, a cavity is specifically contained between the thin-walled tube and the heating assembly, a front end plug and a rear end plug are respectively arranged at the front end and the rear end of the cavity, and magnesium oxide powder is filled in the cavity.

Preferably, the heating assembly comprises a resistance wire and a magnesium tube, the resistance wire is wound outside the magnesium tube, and joints at two ends of the resistance wire are respectively connected with a first lead-out rod and a second lead-out rod.

Preferably, a first lead-out hole for the first lead-out rod to penetrate out and a second lead-out hole for the second lead-out rod to penetrate out are formed in the magnesium tube in the front-back direction, and the first lead-out hole and the second lead-out hole are separated by a certain distance.

Preferably, the rear end plug is provided with a first through hole in interference fit with the first lead-out rod and a second through hole in interference fit with the second lead-out rod, and the first through hole and the second through hole are separated by a certain distance.

Preferably, the resistance wire is further wrapped with a second insulating layer.

Preferably, a grounding wire is arranged between the first insulating layer and the tube body, and the grounding wire is tightly attached to the tube body.

Preferably, the first insulating layer comprises an insulating tape and a ceramic adhesive, the insulating tape is wound outside the tube body, and the ceramic adhesive is coated outside the insulating tape.

Compared with the prior art, the utility model provides a heating pipe sets gradually first insulation layer, heating element and magnesia powder from inside to outside between body and thin wall pipe, has strengthened the resistance to pressure and the insulating nature of heating pipe greatly to improve the safety in utilization and prolonged the life of heating pipe, also satisfied the heating pipe and used in severe cold environment, improved rail vehicle sanding system's security greatly.

Secondly, provide a rail vehicle sanding system, include above-mentioned heating pipe.

Preferably, the heating pipe is externally vulcanized and injection-molded with a rubber sleeve.

Preferably, the outer wall of the pipe body is provided with a plurality of grooves matched with the rubber sleeve.

Compared with the prior art, rail vehicle sanding system be the same with the advantage that above-mentioned heating pipe has for prior art, no longer describe herein.

Drawings

Fig. 1 is a cross-sectional view of a heating pipe according to an embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

FIG. 4 is an enlarged view of section C of FIG. 1;

fig. 5 is a side view of a rear end plug according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of the rear end plug according to the embodiment of the present invention.

Description of reference numerals:

the manufacturing method comprises the following steps of 1-a pipe body, 11-a groove, 2-a first insulating layer, 3-a heating assembly, 31-a first leading-out rod, 32-a second leading-out rod, 4-a thin-walled pipe, 5-a front end plug, 6-a rear end plug, 61-a first through hole, 62-a second through hole, 63-an inner hole, 7-magnesium oxide powder, 8-a second insulating layer, 9-a grounding wire and 10-a rubber sleeve.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

The locomotive is in severe cold district, and severe cold weather can freeze the sand outlet of sanding device, leads to the sand grain to be blown out, just needs to heat the deicing for sanding system through the sanding heater this moment, guarantees sanding system's normal operating. The heating pipe of the sanding heater is heated by adopting a resistance wire mode mostly, but the outer diameter of the vulcanized heating pipe is limited by the appearance structure and the size

On the premise of ensuring that the unilateral sizing material is 2mm, the outer diameter of the stainless steel thin-wall pipe on the outer layer is 24mm, the wall thickness of the stainless steel thin-wall pipe is 0.5mm, and by combining the sizes, the distance between the inner wall of the stainless steel thin-wall pipe and the resistance wire is less than 1mm, so that the distance between the resistance wire of the heating pipe and the inner wall of the stainless steel thin-wall pipe is very limited.

However, the heating tube in the prior art is affected by the distance between the resistance wire of the heating tube and the inner wall of the stainless steel thin-wall tube, so that the voltage resistance and the insulation performance of the heating tube are limited to a certain extent, the voltage resistance value of the heating tube can only reach 1500V generally, and the insulation performance in a cold state is not more than 200M Ω, so that the voltage resistance and the insulation performance are poor.

Therefore, the present invention provides a heating pipe, which is shown in fig. 1 to 3, and comprises a pipe body 1 and a first insulating layer 2 wrapped outside the pipe body 1, wherein the outer wall of the first insulating layer 2 is sleeved with a heating assembly 3; the heating assembly 3 overcoat is equipped with thin wall pipe 4, specifically holds the chamber between thin wall pipe 4 and the heating assembly 3, holds the front and back both ends in chamber and is equipped with front end cap 5 and rear end cap 6 respectively, and holds the intracavity and fill and have magnesium oxide powder 7.

The inner cavity of the pipe body 1 is used for conveying sand, one end of the pipe body 1 is communicated with a sand spreader (not marked in the figure), the other end of the pipe body is a sand outlet, the sand outlet is aligned with the position of a locomotive track to ensure that the sand in the sand spreader can be conveyed to a specified position, and when the sand is conveyed to the specified position, the friction between wheels of the locomotive and the track can be increased, so that the braking effect of the locomotive is improved. Preferably, the pipe body 1 is made of stainless steel, because stainless steel has better corrosion resistance and heat resistance, it is very suitable for the use environment of the sanding heater.

In this embodiment, in order not to affect the amount of sand to be transported, the heating element 3 for generating heat is selectively provided outside the pipe body 1, and therefore the first insulating layer 2 is provided between the heating element 3 and the pipe body 1 to ensure insulation of the pipe body 1. The first insulating layer 2 is wrapped up on the outer wall of the pipe body 1 in a winding manner in a sealing manner so as to ensure that the heating assembly 3 does not directly contact with the pipe body 1, thereby ensuring the insulativity of the pipe body 1.

Meanwhile, in order to protect the heating assembly 3 from being damaged by external force, the thin-wall tube 4 is sleeved on the outer side of the heating assembly 3, a certain gap is kept between the thin-wall tube 4 and the heating assembly 3, namely, an accommodating cavity is formed between the thin-wall tube 4 and the heating assembly 3; the purpose that the chamber was held in the setting is in order to fill magnesia 7, magnesia 7 is an insulating material, and its heat conductivity is good, but the biggest shortcoming of magnesia 7 is easy moisture absorption, can lead to insulating properties to descend after the moisture, probably lead to electric short circuit to puncture when serious, consequently adopt in this embodiment to set up front end cap 5 and rear end cap 6 respectively at the front and back both ends that hold the chamber, front end cap 5 and rear end cap 6 have played the sealed effect that holds the chamber both ends open-ended to prevent that magnesia 7 from absorbing moisture to lose efficacy. The magnesia powder 7 is preferably an electrical grade high-temperature magnesia powder. The length of the thin-walled tube 4 in the front-back direction is larger than that of the heating assembly 3 in the front-back direction, so that a front end plug 5 and a rear end plug 6 are respectively installed in the front end and the rear end of the thin-walled tube 4, wherein the front end plug 5 and the rear end plug 6 are both rubber plugs which have certain elasticity, and the rubber plugs are in interference fit with the thin-walled tube 4, so that better insulation and sealing performance are achieved.

The material of the thin-wall pipe 4 is preferably stainless steel, because the stainless steel has better corrosion resistance and heat resistance, and the deformation resistance strength is higher; the wall thickness dimension range of the thin-walled tube 4 can be selected according to the actual application scenario. For an outer diameter of

The wall thickness of the thin-walled tube 4 is preferably in the range of 1mm to 3 mm. If the wall thickness is too small, the deformation resistance strength of the thin-wall tube 4 may not be enough, the thin-wall tube is easy to deform under stress, and the normal use of the heating assembly 3 is affected after deformation, and if the wall thickness is too large, the protective sleeve for protecting the heating tube may be thinned due to the limitation of the whole size of the heating tube during later vulcanization; the wall thickness of the preferable thin-wall pipe 4 is 2mm, and when the wall thickness is taken as the value, the thin-wall pipe 4 not only can ensure that the thin-wall pipe has certain deformation resistance, but also can meet the overall size requirement of the heating pipe.

The preferred shape of body 1 is cylindrical, and wherein, first insulating layer 2, heating element 3, thin wall tube 4 all are coaxial with body 1, and the purpose of design like this lies in for body 1 is heated more evenly, improves the heating efficiency of heating pipe.

The utility model provides a heating pipe sets gradually first insulation layer 2, heating element 3 and magnesia powder 7 from inside to outside between body 1 and thin wall pipe 4, has strengthened the resistance to pressure and the insulating nature of heating pipe greatly to improve the safety in utilization and prolonged the life of heating pipe, also satisfied the heating pipe and used in severe cold environment, improved rail vehicle sanding system's security greatly.

In some embodiments, as shown in fig. 3, the heating assembly 3 comprises a resistance wire and a magnesium tube, the resistance wire is wound on the outer wall of the magnesium tube, and a first lead-out rod 31 and a second lead-out rod 32 are respectively connected to two end joints of the resistance wire.

Wherein, the magnesium tube is subjected to high-temperature moisture removal before manufacture to prevent carbonization; the two end connectors of the resistance wire are respectively led into the same side position through the first lead-out rod 31 and the second lead-out rod 32 so as to facilitate the subsequent connection with an external power supply. The resistance wire will reserve certain length after the outer wall of winding at the magnesium pipe to guarantee that the follow-up draw of heating pipe back, the both ends of resistance wire and first draw forth excellent 31 and the second and draw forth excellent 32 contact that can also be reliable, thereby guarantee that heating element 3 can normally work. In addition, when the resistance wire is wound on the outer wall of the magnesium tube, a certain distance is kept between every two circles of resistance wire to prevent short circuit of money.

The utility model provides a heating pipe sets up the magnesium pipe for support the resistance wire, prevent the resistance wire short circuit of taking a contact, and the heat conduction of magnesium pipe is good, has strengthened heating element 3's heat conductivility, so that the heat of more effectual transmission resistance wire.

Preferably, the magnesium tube is provided with a first lead-out hole for the first lead-out rod 31 to penetrate out and a second lead-out hole for the second lead-out rod 32 to penetrate out in the front and back direction, the size of the first lead-out hole is slightly larger than the outer diameter of the first lead-out rod 31, and similarly, the size of the second lead-out hole is slightly larger than the outer diameter of the second lead-out rod 32, so that the lead-out rods can smoothly penetrate out of the lead-out holes, and the first lead-out hole and the second lead-out hole are arranged for ensuring that the first lead-out rod 31 and the second lead-out rod 32 can penetrate out of the inner cavity of the magnesium tube, so as to weaken the extrusion influence of the magnesium oxide powder 7 on the first lead-; the first hole of drawing forth and the second hole of drawing forth are separated by certain distance, and the position of drawing forth the hole with the second is first to be stagger setting each other promptly to effectively prevent that first stick 31 and the second of drawing forth from taking the line each other and the short circuit, guarantee heating element 3's safety in utilization.

Since the first lead-out rod 31 and the second lead-out rod 32 are both led out from the rear side of the heating assembly 3, as shown in fig. 5 and 6, the rear end plug 6 is provided with a first through hole 61 in interference fit with the first lead-out rod 31 and a second through hole 62 in interference fit with the second lead-out rod 32, the first through hole 61 and the second through hole 62 are separated by a certain distance, and a sufficient deformation space is reserved for the first lead-out rod 31 and the second lead-out rod 32, so that when the tail ends of the first lead-out rod 31 and the second lead-out rod 32 are connected with an external power supply, the first lead-out rod 31 and the second lead-out rod 32 cannot touch each other to cause short circuit. Preferably, the first lead-out hole and the second lead-out hole are respectively communicated with the first through hole 61 and the second through hole 62, and the positions of the first lead-out hole and the second lead-out hole are matched with each other, so that the first lead-out rod 31 and the second lead-out rod 32 can smoothly penetrate out of the rear end plug 6; the first through hole 61 and the second through hole 62 are preferably spaced apart from each other by a distance sufficient to ensure that the first lead-out rod 31 and the second lead-out rod 32 are not short-circuited by wiring after the first through hole 61 is rotated by 120 ° around the central axis of the tube body 1 and the position of the second through hole 62 is exactly coincident with the position of the first lead-out rod 31 and the second lead-out rod 32 are connected with an external power supply.

Because magnesia powder 7 is the more dry graininess object, extrude the resistance wire easily and lead to the resistance wire to warp when magnesia powder 7 receives external force, if the resistance wire warp seriously, finally probably lead to the resistance wire to take the short circuit, consequently preferred, as shown in figure 2, the outer parcel of resistance wire has second insulating layer 8, second insulating layer 8 twines on the outer wall of magnesium pipe and covers the resistance wire, reach the purpose that prevents resistance wire and magnesia powder 7 direct contact, thereby guarantee that heating element 3 can normally work.

As shown in fig. 1 to 3, the length of the first insulating layer 2 in the front-rear direction is greater than the length of the heating element 3 in the front-rear direction, so as to prevent the heating element 3 from directly contacting the pipe body 1, thereby effectively preventing the pipe body 1 from generating a leakage phenomenon.

For safety, as shown in fig. 3, a ground wire 9 is provided between the first insulating layer 2 and the pipe 1, and the ground wire 9 is wound around and fixed to the pipe 1 with the first insulating layer 2. The position of the grounding wire 9 and the positions of the first leading-out rod 31 and the second leading-out rod 32 are respectively staggered, so that the three are prevented from being mutually connected and short-circuited. In this embodiment, as shown in fig. 5, the grounding wire 9 is led out from the inner hole 63 of the rear end plug 6, and the led-out position is preferably selected to be located at a middle position between the first through hole 61 and the second through hole 62, so that after the grounding wire 9, the first lead-out rod 31 and the second lead-out rod 32 are connected with an external power supply, the three are not in a short circuit, and the safety and stability of the electric heating are ensured.

In some embodiments, the first insulating layer 2 includes an insulating tape wound around the tube 1 and a ceramic paste coated outside the insulating tape. The insulating tape is made of polyimide tape, which is one of organic polymer materials with the best comprehensive performance, resists high temperature of more than 400 ℃, and has high insulating performance. The first insulating layer 2 made of the insulating tape and the ceramic adhesive has relatively high insulating property and heat resistance.

For an outer diameter of

The thickness of the first insulating layer 2 and the second insulating layer 8 is in the range of 0.2mm to 0.5mm, and if the thickness is too small, the insulation is affected, but due to the limitation of size, if the thickness is too large, the overall assembly of the heating tube is affected. Preferably, the thickness value of the first insulating layer 2 and the second insulating layer 8 is 0.3mm, and when the thickness value is taken, the heating tube can have high insulating property, and the size limit requirement of the whole structure can be met.

As shown in FIG. 2, the filling thickness of the magnesia powder 7 in the radial direction is a, the distance from the inner wall of the thin-walled tube 4 to the first insulating layer 2 is b, and the requirement that a/b is not less than 0.25 and not more than 0.5 is satisfied, if the value of a/b is too small, the overall insulating effect of the heating tube is affected, and if the value of a/b is too large, the requirement of the overall size limitation of the heating tube cannot be satisfied. Preferably, a/b is 0.3, and when the value is taken, the heating tube can have strong insulation and meet the size limitation requirement of the whole structure.

A rail vehicle sanding system comprises the heating pipe.

The utility model provides a rail vehicle sanding system sets gradually first insulation layer 2, heating element 3 and magnesia powder 7 from inside to outside between body 1 and thin wall pipe 4, has strengthened the resistance to pressure and the insulating nature of heating pipe greatly to the safety in utilization has been improved and the life of heating pipe has been prolonged.

In some embodiments, as shown in fig. 1 and 4, the rubber sleeve 10 is vulcanized and injection-molded outside the heating tube, and the material of the rubber sleeve 10 is high-temperature silicone rubber, which has high heat resistance and insulation.

In addition, as shown in fig. 4, the outer wall of the pipe body 1 is provided with a plurality of grooves 11 matched with the rubber sleeve 10, in this embodiment, the grooves 11 are annular grooves, and the grooves 11 are used for effectively bonding the rubber sleeve 10 to the stainless steel pipe body 1 when the rubber sleeve 10 is vulcanized and molded, so that the overall sealing degree is improved.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.

Claims (10)

1. The heating pipe is characterized by comprising a pipe body (1) and a first insulating layer (2) wrapped outside the pipe body (1), wherein a heating assembly (3) is sleeved on the outer wall of the first insulating layer (2); the heating assembly (3) is sleeved with a thin-walled tube (4), a cavity is specifically contained between the thin-walled tube (4) and the heating assembly (3), a front end plug (5) and a rear end plug (6) are respectively arranged at the front end and the rear end of the cavity, and magnesium oxide powder (7) is filled in the cavity.

2. The heating pipe according to claim 1, wherein the heating assembly (3) comprises a resistance wire and a magnesium pipe, the resistance wire is wound outside the magnesium pipe, and two end connectors of the resistance wire are respectively connected with a first lead-out rod (31) and a second lead-out rod (32).

3. The heating pipe of claim 2, wherein the magnesium pipe is provided with a first lead-out hole for the first lead-out rod (31) to pass through and a second lead-out hole for the second lead-out rod (32) to pass through in the front-back direction, and the first lead-out hole and the second lead-out hole are arranged at intervals.

4. The heating tube according to claim 2, characterized in that the rear end plug (6) is provided with a first through hole (61) which is in interference fit with the first lead-out rod (31) and a second through hole (62) which is in interference fit with the second lead-out rod (32), and the first through hole (61) and the second through hole (62) are arranged at intervals.

5. The heating tube according to claim 2, characterized in that a second insulating layer (8) is wrapped around the resistance wire.

6. The heating tube according to any of claims 1 to 5, characterized in that a grounding wire (9) is provided between the first insulating layer (2) and the tube body (1), and the grounding wire (9) is tightly attached to the tube body (1).

7. The heating tube according to any of claims 1 to 5, characterized in that the first insulating layer (2) comprises an insulating tape and a ceramic glue, the insulating tape is wound outside the tube body (1), and the ceramic glue is coated outside the insulating tape.

8. A rail vehicle sanding system comprising the heating tube of any of claims 1-7.

9. Rail vehicle sanding system according to claim 8, wherein the heating tube is over-moulded with a rubber sleeve (10).

10. A rail vehicle sanding system according to claim 9, wherein the outer wall of the tubular body (1) is provided with a plurality of grooves (11) cooperating with the rubber sleeve (10).

Images