Heating pipe

Abstract

The utility model relates to a heating pipe which comprises a pipe body, a sealing piece and first filler, the pipe body is provided with an inner cavity, the first filler is located in the inner cavity, the pipe body is provided with a contraction part, and the contraction part extends from a body of the pipe body to the center of a pipe opening of the pipe body in the radial direction of the pipe body; the sealing piece is provided with a step wall, the step wall is located in the inner cavity, in the length direction of the pipe body, the first filler is farther from the end of the pipe body than the step wall, the projection of the wall corresponding to the pipe opening of the pipe body in the length direction of the pipe body is located on the step wall, and in the length direction of the pipe body, the step wall abuts against the contraction part in a sealed mode. Due to the fact that the projection, in the length direction of the pipe body, of the wall corresponding to the pipe opening of the pipe body is located on the step wall, and the step wall abuts against the contraction part in a sealed mode, the sealing piece is limited and prevented from being separated from the pipe body, the pipe opening of the pipe body is sealed through the contraction part and the sealing piece, and therefore the structure corresponding to the sealing is simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heating pump, in particular to a heating pipe for a heating pump of a dishwasher. BACKGROUND

[0002] The inside of the heating pipe needs to be filled with insulating filler, which is mostly magnesium oxide powder. The heating pipe needs to be provided with a sealing structure to prevent leakage of the magnesium oxide powder. In the related art, the sealing structure is implemented by using ceramic particles, AB glue and sealing silica gel. Long-term heat curing of the AB glue and the sealing silica gel is required during sealing, and thus the sealing structure has many components. SUMMARY

[0003] To solve at least one of the above technical problems, the following technical solutions are provided:

[0004] A heating pipe, comprising a pipe body, a sealing member and a first filler, the pipe body has an inner cavity, the first filler is located in the inner cavity, an end portion of the pipe body has a contraction portion, the contraction portion extends from the body of the pipe body along a radial direction of the pipe body towards a center of a pipe opening of the pipe body, the sealing member has a stepped wall, the stepped wall is located in the inner cavity, along a length direction of the pipe body, the first filler is farther away from the end portion of the pipe body than the stepped wall, a wall corresponding to the pipe opening of the pipe body is projected along the length direction of the pipe body and located on the stepped wall, along the length direction of the pipe body, the stepped wall is in sealing abutment with the contraction portion.

[0005] Since the wall corresponding to the pipe opening of the pipe body is projected along the length direction of the pipe body and located on the stepped wall, and the stepped wall is in sealing abutment with the contraction portion, the position of the sealing member is limited, and the sealing member is prevented from coming out of the pipe body. Moreover, the pipe opening of the pipe body is sealed by the contraction portion and the sealing member, and thus the structure corresponding to the sealing is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 A perspective view of an embodiment of the present application;

[0007] Figure 2 A front view of the heating pipe; Figure 1

[0008] A top view of the heating pipe; Figure 3 Figure 1

[0009] Figure 4 A sectional view along line A-A of the heating pipe; Figure 3

[0010] A perspective view of the sealing member and the guide rod; Figure 5 Figure 1 A perspective view of the sealing member and the guide rod;​​​

[0011] Figure 6 For Figure 5 Enlarged schematic view of the central region C;

[0012] Figure 7 For Figure 4 Enlarged schematic view of the central region B;

[0013] Figure 8 Schematic view of another embodiment of the application.

[0014] Reference signs:

[0015] 1, tube body; 2, sealing element; 3, first filler; 4, lead bar; 5, heating wire;

[0016] 10, inner cavity; 11, constricted portion; 12, main body portion; 13, bent portion; 14, flange; 21, stepped wall; 22, first accommodating passage; 23, first sub-portion; 24, second sub-portion;

[0017] 111, first connecting section; 112, mating section; 1121, first mating wall; 131, main body section; 132, second connecting section; 133, first cross section; 41, connecting portion; 42, anti-rotation portion; 421, protrusion. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0019] The heating tube in the present application is mainly used in a heating pump in a dishwasher. The heating pump has a heating disc, and the body of the heating tube is embedded in the heating disc to heat the fluid in the inner cavity of the heating pump through the heating disc.

[0020] As Figures 1-7As shown, a heating tube comprises a tube body 1, a sealing member 2 and a first filler 3, the first filler 3 is an insulating filler, in this embodiment, it is magnesium oxide powder. The tube body 1 has an inner cavity 10, the first filler 3 is located in the inner cavity 10, the tube body 1 has a contraction part 11, the contraction part 11 extends from the body of the tube body 1 to the center of the tube opening of the tube body 1 along the radial direction of the tube body 1; the sealing member 2 has a stepped wall 21, the stepped wall 21 is located in the inner cavity 10, along the length direction of the tube body 1, the first filler 3 is away from the end of the tube body 1 than the stepped wall 21, the wall corresponding to the tube opening of the tube body 1 is located in the stepped wall 21 along the length direction of the tube body 1, along the length direction of the tube body 1, the stepped wall 21 is sealed and abuts with the contraction part 11. When assembling, the first filler 3 is filled in the inner cavity 10 first, then the sealing member 2 is assembled inward, and the end of the tube body is processed to form the contraction part 11. The sealing member 2 extrudes the first filler 3 to the inner cavity 10, the first filler 3 has a reverse force on the sealing member 2, and the contraction part 11 limits the sealing member 2 to prevent it from coming out of the inner cavity 10 of the tube body 1.

[0021] Since the wall corresponding to the tube opening of the tube body 1 is located in the stepped wall 21 along the length direction of the tube body 1, and the stepped wall 21 is sealed and abuts with the contraction part 11, the limiting of the sealing member 2 is realized, and the tube opening of the tube body 1 is sealed through the contraction part and the sealing member 2, so that the structure corresponding to the sealing is simplified. Moreover, the process of realizing the contraction is simple, so as to be beneficial to processing. Since the stepped wall 21 is sealed and abuts with the contraction part 11, it can also prevent water vapor and the like from entering the inner cavity 10 from the tube opening to improve electrical safety.

[0022] In this embodiment, the sealing member 2 is made of insulating material, specifically, ceramic; in some embodiments, the sealing member 2 can also be made of other materials with insulation and certain hardness.

[0023] The contraction part 11 comprises a first connecting section 111 and a matching section 112, the first connecting section 111 is connected with the matching section 112 and the body of the tube body 1 respectively; the inner diameter of the first connecting section 111 gradually decreases from the body of the tube body 1 to the direction of the contraction part 11; along the length direction of the tube body 1, the matching section 112 is sealed and abuts with the stepped wall 21. The first connecting section 111 is curvedly arranged, and plays a transition and connection role between the matching section 112 and the body of the tube body 1.

[0024] The matching section 112 has a first matching wall 1121 which is matched with the step wall 21. In the embodiment, the first matching wall 1121 is perpendicular to the axial direction of the pipe opening of the pipe body 1, and in some embodiments, the first matching wall 1121 is substantially perpendicular to the axial direction of the pipe body 1. In this way, in the length direction of the pipe body 1, part of the sealing piece 2 is located between the first filler 3 and the first matching wall 1121, and the first matching wall 1121 plays a limiting role on the sealing piece 2, preventing the sealing piece 2 from coming out, and the first matching wall 1121 is perpendicular or substantially perpendicular to the axial direction of the pipe opening of the pipe body 1, so on the one hand it is convenient for the first matching wall 1121 to be matched with the step wall 21, and on the other hand it can reduce the force applied to the sealing piece 2 in the radial direction of the sealing piece 2, thereby reducing the possibility of damage to the sealing piece 2.

[0025] In the embodiment, the surface corresponding to the first matching wall 1121 is a plane, and the surface corresponding to the step wall 21 is also a plane, and the first matching wall 1121 is matched with the step wall 21 in a plane-to-plane manner, which is convenient for processing and also helps to ensure the reliability of sealing and limiting.

[0026] The sealing piece 2 has a first sub-portion 23 and a second sub-portion 24, the outer diameter of the first sub-portion 23 is smaller than the outer diameter of the second sub-portion 24, and at least part of the first sub-portion 23 is located outside the inner cavity 10; at least part of the second sub-portion 24 is located in the inner cavity 10, and the second sub-portion 24 is tightly matched with the wall corresponding to the inner cavity 10; in the embodiment, the second sub-portion 24 is entirely located in the inner cavity 10, and the step wall 21 is located between the first sub-portion 23 and the second sub-portion 24. The second sub-portion 24 is tightly matched with the wall corresponding to the inner cavity 10, which is conducive to limiting the sealing piece 2 on the one hand, and on the other hand, it is conducive to reducing the leakage of the first filler 3 through the gap between the sealing piece 2 and the wall corresponding to the inner cavity 10.

[0027] The pipe body 1 includes a main body portion 12 and a bent portion 13, the bent portion 13 is located at both ends of the main body portion 12, and the included angle corresponding to the connection between the bent portion 13 and the main body portion 12 is greater than zero. The heating pipe has a lead rod 4, which is made of conductive material, specifically conductive metal; the lead rod 4 is provided in the sealing piece 2, and at least part of the sealing piece 2 is located in the part of the inner cavity 10 corresponding to the bent portion 13, and the contraction portion 11 is located at the end of the bent portion 13 away from the main body portion 12. The lead rod 4 is used to connect an external circuit (such as a power supply, etc.), and the bent portion 13 is different from the main body portion 12 in the first plane, which facilitates increasing the distance between the lead rod 4 and the main body portion 12, because the lead rod 4 needs to be connected with the external circuit, and maintaining a distance can improve safety.

[0028] The bending part 13 comprises a main body segment 131 and a second connecting segment 132, one end of the second connecting segment 132 is connected with the main body part 12, and the other end of the second connecting segment 132 is connected with the main body segment 131; the second connecting segment 132 is bent and arranged, and a first cross section 133 is defined, the first cross section 133 passes through the connecting position of the main body segment 131 and the second connecting segment 132 (the first cross section 133 is perpendicular to the length direction of the main body segment 131); along the length direction of the main body segment 131, the lead rod 4 is farther away from the first cross section 133 than the second connecting segment 132. In the manufacturing process, the heating pipe is obtained by being bent multiple times in a vertical state, and here, along the length direction of the main body segment 131, the lead rod 4 is farther away from the first cross section 133 than the second connecting segment 132, so that the distance between the end of the lead rod 4 and the wall corresponding to the inner cavity 10 can be ensured, the risk of shortening the distance between the lead rod 4 and the wall corresponding to the inner cavity 10 after the bending process is reduced, and thus the pressure resistance is ensured and the electrical safety is improved.

[0029] The heating pipe further comprises a heating wire 5, the heating wire 5 is located in the inner cavity 10, and the two ends of the heating wire 5 are respectively connected with the two lead rods 4 (in this application, the number of the lead rods 4 is two), specifically welded to realize electrical connection; the first filler 3 covers the heating wire 5, and the two ends of the heating wire 5 are respectively connected with the lead rods 4. The heating wire 5 is arranged inside to generate heat, and the first filler 3 covers the heating wire 5, so that the creepage distance between the heating wire 5 and the inner wall of the pipe body 1 is increased, and thus the pressure resistance is improved.

[0030] The sealing element 2 has a first containing channel 22 penetrating through the body thereof in the radial direction, and part of the lead rod 4 is located in the first containing channel 22, the two ends of the lead rod 4 are respectively exposed at the two ends of the first containing channel 22, one end of the lead rod 4 is located in the inner cavity 10 and connected with the heating wire 5, and the other end of the lead rod 4 is used for electrical connection with an external circuit (such as a power supply).

[0031] The lead rod 4 has a connecting part 41 and an anti-rotation part 42, the connecting part 41 is connected with the heating wire 5, specifically welded to realize electrical connection; the connecting part 41 and the anti-rotation part 42 are located in the inner cavity 10, along the axial direction of the sealing element 2, the anti-rotation part 42 is located between the connecting part 41 and the sealing element 2, and the first filler 3 covers the anti-rotation part 42. Along the length direction of the pipe body 1, the anti-rotation part 42 is located between the connecting part 41 and the sealing element 2, which is conducive to ensuring the contact area of the anti-rotation part 42 and the first filler 3 and improving the friction between the anti-rotation part 42 and the first filler 3, so as to ensure the reliability of anti-rotation.

[0032] The anti-rotation part 42 has a protruding part 421, the protruding part 421 extends from one end of the anti-rotation part 42 to the other end of the anti-rotation part 42 along the axial direction of the lead rod 4; the protruding part 421 is located on the outer peripheral wall of the lead rod 4, and the protruding part 421 is uniformly distributed along the outer peripheral direction of the lead rod 4.

[0033] Since the convex portion 421 is located on the outer peripheral wall of the guide rod 4, and the convex portion 421 extends from one end of the anti-rotation portion 42 to the other end of the anti-rotation portion 42 along the axial direction of the guide rod 4; and since the first filler 3 covers the anti-rotation portion 42, that is, the first filler 3 covers the convex portion 421, the convex portion 421 cooperates with the first filler 3 to reduce the possibility of rotation of the guide rod 4. In some embodiments, the anti-rotation portion 42 can also be provided with anti-skid lines or other rough surfaces that are beneficial to increase friction.

[0034] Figure 8 Another embodiment is shown, in which,

[0035] The wall corresponding to the inner cavity 10 has a flange 14 located on the inner wall corresponding to the bending portion 13. Along the length direction of the pipe body 1, the flange 14 is closer to the main body portion 12 of the pipe body 1 than the contraction portion 11, and the flange 14 is tightly fitted with the second sub-portion 24. The flange 4 can be a continuous one around the outer periphery of the second sub-portion 24, or can be a plurality of discrete and uniformly distributed convex points around the outer periphery of the second sub-portion 24. In this embodiment, the flange 14 can be formed by spinning the outer part of the pipe body. By tightly fitting the second sub-portion with the flange 14, an acting force can be applied to the sealing member 2 in the radial direction, thereby achieving the limiting effect of the sealing member, and reducing the risk of movement of the sealing member in the pipe body. When the flange 14 is a continuous one around the outer periphery of the second sub-portion 24, the flange 14 can also play a role in hindering the first filler 3 from leaking out of the gap between the sealing member 2 and the wall corresponding to the inner cavity 10. When the flange 14 is a plurality of discrete and uniformly distributed convex points around the outer periphery of the second sub-portion 24, the first filler 3 can also be extruded into the inner cavity 10 through the space between the convex points when the sealing member 1 is assembled into the inner cavity 10, thereby reducing the resistance of the sealing member 2 to move into the inner cavity 10.

[0036] The above-described embodiments only express several embodiments of the present application, which are described in more detail and in more detail, but cannot be understood as limiting the scope of the patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of changes, modifications, replacements and variations can be made, which are within the scope of protection of the present application.

Claims

1. A heating tube comprising a tube body (1), a sealing member (2) and a first filler (3), the tube body (1) having an inner cavity (10), the first filler (3) being located in the inner cavity (10), characterized in that, the tube body (1) has a contraction portion (11) extending from the body of the tube body (1) along the radial direction of the tube body (1) towards the center of the tube mouth of the tube body (1); the sealing member (2) has a stepped wall (21) located in the inner cavity (10), along the length direction of the tube body (1), the first filler (3) is farther away from the end of the tube body (1) than the stepped wall (21), the projection of the wall corresponding to the tube mouth of the tube body (1) along the length direction of the tube body (1) is located on the stepped wall (21), and along the length direction of the tube body (1), the stepped wall (21) is in sealing abutment with the contraction portion (11).

2. The heating tube according to claim 1, characterized in that the contraction portion (11) comprises a first connecting section (111) and a matching section (112), the first connecting section (111) is connected with the matching section (112) and the body of the tube body (1) respectively; the inner diameter of the first connecting section (111) gradually decreases from the main body of the tube body (1) towards the contraction portion (11); along the length direction of the tube body (1), the matching section (112) is in sealing abutment with the stepped wall (21).

3. The heating tube of claim 2, wherein the matching section (112) has a first matching wall (1121) which is in close contact with the stepped wall (21), and the first matching wall (1121) is perpendicular or substantially perpendicular to the axial direction of the tube mouth of the tube body (1).

4. The heating tube of claim 1 wherein, the sealing member (2) has a first sub-portion (23) and a second sub-portion (24), the outer diameter of the first sub-portion (23) is smaller than that of the second sub-portion (24), and at least part of the first sub-portion (23) is located outside the inner cavity (10); at least part of the second sub-portion (24) is located in the inner cavity (10), and the second sub-portion (24) is tightly fitted with the wall corresponding to the inner cavity (10); or, the wall corresponding to the inner cavity (10) has a flange (14) which is tightly fitted with the second sub-portion (24).

5. The heating tube according to any one of claims 1 to 4, characterized in that the tube body (1) comprises a main body portion (12) and a bent portion (13), the bent portion (13) is located at both ends of the main body portion (12), and the included angle corresponding to the connection between the bent portion (13) and the main body portion (12) is greater than zero; the heating tube has a lead rod (4) which is provided in the sealing member (2), at least part of the sealing member (2) is located in the part of the inner cavity (10) corresponding to the bent portion (13), and the contraction portion (11) is located at the end of the bent portion (13) which is relatively far away from the main body portion (12).

6. The heating tube of claim 5 wherein, The bending part (13) comprises a main body section (131) and a second connecting section (132), one end of the second connecting section (132) is connected with the main body part (12), and the other end of the second connecting section (132) is connected with the main body section (131); The second connecting section (132) is bent and defines a first cross section (133) passing through the connection between the main body section (131) and the second connecting section (132); Along the length direction of the main body section (131), the guide rod (4) is farther away from the second connecting section (132) than the first cross section (133).

7. The heating tube according to any one of claims 1 to 4, wherein The heating pipe further comprises a guide rod (4) and a heating wire (5), the guide rod (4) is arranged in the sealing element (2), the heating wire (5) is arranged in the inner cavity (10), the first filler (3) covers the heating wire (5), and both ends of the heating wire (5) are connected with the guide rod (4).

8. The heating tube of claim 7, wherein The sealing element (2) has a first containing channel (22) penetrating the body in the radial direction, part of the guide rod (4) is located in the first containing channel (22), both ends of the guide rod (4) are exposed at both ends of the first containing channel (22), and one end of the guide rod (4) is located in the inner cavity (10) and connected with the heating wire (5).

9. The heating tube of claim 8, wherein The guide rod (4) has a connecting part (41) and an anti-rotation part (42), the connecting part (41) is connected with the heating wire (5), the connecting part (41) and the anti-rotation part (42) are located in the inner cavity (10), along the axial direction of the sealing element (2), the anti-rotation part (42) is located between the connecting part (41) and the sealing element (2), and the first filler (3) covers the anti-rotation part (42).

10. The heating tube of claim 9, wherein The anti-rotation part (42) has a convex part (421) extending from one end of the anti-rotation part (42) to the other end of the anti-rotation part (42) along the axial direction of the guide rod (4); The convex part (421) is located on the outer peripheral wall of the guide rod (4), and the convex part (421) is uniformly distributed along the peripheral direction of the guide rod (4).

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