Electric heater and electric water heater

Abstract

The present invention discloses an electric heater and an electric water heater. The electric heater comprises a flange, a first heating tube and a second heating tube. Both the first heating tube and the second heating tube are curved U-shaped structures. The first heating tube comprises a first straight section, a first inclined section and a second straight section connected by bending. The connection between the first heating wire and the first conductive lead rod is arranged at the first inclined section. The second heating tube is arranged above the first heating tube. The second heating tube comprises a third straight section, a second inclined section and a fourth straight section connected by bending. The connection between the second heating wire and the second conductive lead rod is arranged at the third straight section, which effectively avoids the bending connection between the third straight section and the second inclined section from being affected by the first heating tube, and effectively improves the service life of the second heating tube. When installing, the electric heater is arranged in the inner tank of the electric water heater, and the angle between the direction in which the first heating tube and the second heating tube are spaced and arranged side by side and the gravity direction of the inner tank is 25° to 32°.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and in particular to an electric heater and an electric water heater. Background Art

[0002] In order to improve the heating effect, the existing electric water heater generally adopts a U-shaped heating tube with a stepped bend, and is equipped with two U-shaped heating tubes. The two U-shaped heating tubes are divided into a heating tube 1 and a heating tube 2 arranged side by side with an upper and lower interval. In actual operation, the heating tube 1 and the heating tube 2, the parts of the heating tube 1, and the parts of the heating tube 2 will be affected by heat radiation to each other, resulting in excessively high local temperatures on the surface of the heating tube, reducing the service life of the heating tube, and even bursting and leakage of the tube. In particular, the upper bend of the heating tube 1 is particularly prone to local overheating and bursting; and the structure of the heating tube is not firm, and the two are prone to collision during transportation. Summary of the invention

[0003] The object of the present invention is to provide an electric heater and an electric water heater to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The technical solutions adopted to solve the above technical problems are:

[0005] First, the present invention provides an electric heater, which has an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other. The electric heater comprises: a flange, a first heating tube, and a second heating tube. The first heating tube is a first U-shaped structure that is bent. The tube bodies on both sides of the first heating tube are spaced apart along the Y-axis. The first U-shaped bent structure has a first connecting end and a first free end. The first U-shaped structure comprises a first straight segment, a first inclined segment, and a second straight segment that are bent and connected in sequence from the first connecting end to the first free end. The first straight segment and the second straight segment both extend along the X-axis. The first straight segment and the second straight segment are spaced apart in the Z-axis. Both ends of the first heating tube are arranged at the first connecting end. Both ends of the first heating tube are connected to the flange. First conductive lead rods are arranged in the tube bodies at both ends of the first heating tube, and first heating wires are arranged in the remaining tube bodies of the first heating tube. Both ends of the first heating wire are connected to the two first conductive lead rods respectively. The first heating wire is connected to the first conductive lead rods. The connection of the lead rod is arranged at the first inclined section; the second heating tube and the first heating tube are arranged at intervals in the Z-axis direction, the second heating tube is a curved second U-shaped structure, the tube bodies on both sides of the second heating tube are arranged at intervals along the Y-axis direction, the second U-shaped structure has a second connecting end and a second free end, the U-shaped curved structure includes a third straight line segment, a second inclined segment and a fourth straight line segment which are bent and connected in sequence from the second connecting end to the second free end, the third straight line segment is parallel to the first straight line segment, the second inclined segment is parallel to the first inclined segment, and the fourth straight line segment is parallel to the second straight line segment, both ends of the second heating tube are arranged at the second connecting end, both ends of the second heating tube are connected to the flange, second conductive lead rods are arranged in the tube bodies at both ends of the second heating tube, and second heating wires are arranged in the remaining tube bodies of the second heating tubes, both ends of the second heating wires are respectively connected to two second conductive lead rods, and the connection between the second heating wire and the second conductive lead rods is arranged at the third straight line segment.

[0006] It should be noted that the above-mentioned mutually orthogonal X-axis, Y-axis, and Z-axis are virtual technical features, which are mainly used to facilitate the description of various components.

[0007] The beneficial effect of the present invention is that when in use, the second inclined section and the first inclined section in this embodiment are both inclined from top to bottom, so that the first straight section is arranged above the horizontal plane where the second straight section is located, and the third straight section is arranged above the horizontal plane where the fourth straight section is located, thereby expanding the heating range of the electric heater and increasing the temperature rise rate. During heating, the two first conductive lead rods in the first heating tube and the two second conductive lead rods in the second heating tube are connected to the external power supply device, and the first heating wire and the second heating wire generate heat. Since the connection between the second heating wire and the second conductive lead rod is arranged in the third straight section, and the connection between the first heating wire and the first conductive lead rod is arranged in the first inclined section, the heat generated by the first heating tube can be avoided from being directly transferred upward to the bent connection between the third straight section and the second inclined section, thereby effectively avoiding the bending connection between the third straight section and the second inclined section from being affected by the first heating tube during the heating process, and effectively improving the service life of the second heating tube.

[0008] As a further improvement of the above technical solution, the first U-shaped structure also includes a fifth straight line segment connected to the second straight line segment in a U-shaped bend, the fifth straight line segment and the fourth straight line segment are arranged on the same straight line, and a fixing clamp is arranged between the end of the fifth straight line segment and the end of the fourth straight line segment.

[0009] The fifth straight line segment can improve the heating efficiency of the first heating tube, and can reduce the overall length of the electric heater, meeting the needs of smaller electric water heaters. When the flange is fixedly connected to the first connection end on the first heating tube and the second connection end on the second heating tube, a fixing clamp is also used to fix the first free end and the second free end, that is, the end of the fifth straight line segment is fixed to the end of the fourth straight line segment, thereby improving the structural firmness of the electric heater and avoiding collision between the first heating tube and the second heating tube during transportation and heating.

[0010] As a further improvement of the above technical solution, the fixing clamp includes an upper clamp body and a lower clamp body which are symmetrically connected in the Z-axis direction, and a first arc-shaped clamping portion is provided at both ends of the upper clamp body, and a second arc-shaped clamping portion is provided at both ends of the lower clamp body, and the end portion of the fifth straight line segment and the end portion of the fourth straight line segment are respectively clamped between each pair of the first clamping portion and the second clamping portion.

[0011] When installing the fixing clamp, the upper clamp body and the lower clamp body are symmetrically arranged in the Z-axis direction, and the end of the fifth straight line segment and the end of the fourth straight line segment are respectively matched with the two pairs of the first clamping part and the second clamping part. The upper clamp body and the lower clamp body are combined and fixed, so that the end of the fifth straight line segment and the end of the fourth straight line segment are respectively clamped between each pair of the first clamping part and the second clamping part, and the arc-shaped first clamping part and the arc-shaped second clamping part can match the circular tube body of the heating tube.

[0012] As a further improvement of the above technical solution, the upper clamp body is connected to the lower clamp body by welding. Welding can improve the stability and firmness of the connection between the upper clamp body and the lower clamp body.

[0013] As a further improvement of the above technical solution, the electric heater also includes a first blind tube extending along the X-axis, one end of the first blind tube is connected to the flange, the other end of the first blind tube extends to the outside of the bending point of the third straight line segment and the second inclined segment, the length of the first blind tube is greater than the length of the third straight line segment, and a first temperature probe is arranged at the other end of the first blind tube.

[0014] At this time, the first temperature probe is connected to the thermal circuit breaker, which can effectively monitor the rapid changes in internal temperature when the water heater is dry-burning. The first temperature probe quickly senses it and the thermal circuit breaker immediately cuts off the power.

[0015] As a further improvement of the above technical solution, the electric heater further includes a second blind tube extending along the X-axis, one end of the second blind tube is connected to the flange, the length of the second blind tube is less than the length of the first straight segment, and a second temperature probe is provided at the other end of the second blind tube. In this case, the second blind tube is provided below the third straight segment, the second temperature probe is connected to the whole machine display device, and the second temperature probe can effectively sense the temperature of the inner tank and will not be affected by the temperature overshoot caused by the excessively high local temperature of the heating tube.

[0016] As a further improvement of the above technical solution, the angle between the first straight section and the first inclined section is 100° to 155°. The establishment of this angle can not only satisfy the requirement that the heating tube is submerged as much as possible, but also ensure that when the heater is heating, the surface temperature of the heating tube in the second inclined section and the upper part of the first inclined section will not be affected by the lower part.

[0017] In addition, the present invention also provides an electric water heater, comprising the above-mentioned electric heater and an inner tank, wherein the electric heater is arranged in the inner tank, the flange is connected to the side wall of the inner tank, the direction of the X-axis is in the same direction as the horizontal direction, and the angle between the Z-axis and the gravity direction of the inner tank is 25° to 32°. The setting of this angle can make the surface temperature of the heating tube uniform without mutual influence. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the electric heater provided by the present invention;

[0020] Figure 2 yes Figure 1 A partial enlarged view in FIG.

[0021] Figure 3 This is a schematic diagram of an electric heater provided by the present invention, taken along the Y axis, of one embodiment thereof;

[0022] Figure 4 yes Figure 3 A partial enlarged view of B;

[0023] Figure 5 yes Figure 3 The local enlarged view C;

[0024] Figure 6 This is a schematic diagram of an electric heater provided by the present invention, when one embodiment thereof is installed in an inner tank, along the X-axis direction. DETAILED DESCRIPTION

[0025] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In the description of the present invention, if there are words such as "several", it means one or more, "more" means more than two, greater than, less than, exceed, etc. are understood as not including the number, and above, below, within, etc. are understood as including the number.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0029] Reference Figures 1 to 6The electric heater of the present invention is implemented as follows:

[0030] like Figure 1 and Figure 3 As shown, the electric heater has an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other. The electric heater of this embodiment includes a flange 600, a first heating tube 100, and a second heating tube 200, wherein the first heating tube 100 is a first U-shaped structure that is bent, and the tube bodies on both sides of the first heating tube 100 are arranged at intervals along the Y-axis direction. The first U-shaped bent structure has a first connecting end and a first free end. Specifically: the first U-shaped structure includes a first straight segment 110, a first inclined segment 120, and a second straight segment 130 that are bent and connected in sequence from the first connecting end to the first free end. The first straight segment 110 and the second straight segment 130 both extend along the X-axis direction, and the first straight segment 110 and the second straight segment 130 are arranged at intervals in the Z-axis direction. The two ends of the first heating tube 100 are arranged at the first connecting end, and the two ends of the first heating tube 100 are connected to the flange 600. Figure 4 As shown, first conductive lead rods 140 are provided in the tube bodies at both ends of the first heating tube 100, and first heating wires 150 are provided in the remaining tube bodies of the first heating tube 100. The two ends of the first heating wire 150 are respectively connected to the two first conductive lead rods 140. When in use, the first conductive lead rods 140 are connected to the power supply device, and the first heating wire 150 generates heat; and the connection between the first heating wire 150 and the first conductive lead rod 140 is provided at the first inclined section 120.

[0031] The second heating tube 200 and the first heating tube 100 are arranged at intervals in the Z axis. In this embodiment, the second heating tube 200 is arranged above the first heating tube 100. The second heating tube 200 is a curved second U-shaped structure. The tube bodies on both sides of the second heating tube 200 are arranged at intervals along the Y axis. The second U-shaped structure has a second connecting end and a second free end. Specifically: the U-shaped curved structure includes a third straight segment 210, a second inclined segment 220 and a fourth straight segment 230 that are bent and connected in sequence from the second connecting end to the second free end. The third straight segment 210 is parallel to the first straight segment 110, the second inclined segment 220 is parallel to the first inclined segment 120, and the fourth straight segment 230 is parallel to the second straight segment 130. Both ends of the second heating tube 200 are arranged at the second connecting end, and both ends of the second heating tube 200 are connected to the flange 600. Figure 5As shown, second conductive lead rods 240 are provided in the tube bodies at both ends of the second heating tube 200, and second heating wires 250 are provided in the remaining tube bodies of the second heating tube 200. The two ends of the second heating wire 250 are respectively connected to the two second conductive lead rods 240. When in use, the second conductive lead rods 240 are connected to the power supply device, and the second heating wire 250 generates heat, and the connection between the second heating wire 250 and the second conductive lead rod 240 is provided at the third straight line segment 210.

[0032] When in use, the second inclined section 220 and the first inclined section 120 are both inclined from top to bottom, so that the first straight section 110 is arranged above the horizontal plane where the second straight section 130 is located, and the third straight section 210 is arranged above the horizontal plane where the fourth straight section 230 is located, thereby expanding the heating range of the electric heater and increasing the speed of temperature rise. Specifically: the angle between the first straight section 110 and the first inclined section 120 is 100° to 155°. The establishment of this angle can not only meet the requirement of the heating tube to dive as much as possible, but also ensure that when the heater is heating, the surface temperature of the heating tube in the upper part of the second inclined section 220 and the first inclined section 120 will not be affected by the lower part.

[0033] Furthermore, the first U-shaped structure also includes a fifth straight segment 160 connected to the second straight segment 130 in a U-shaped bend. The fifth straight segment 160 and the fourth straight segment 230 are arranged on the same straight line. A fixing clamp 300 is arranged between the end of the fifth straight segment 160 and the end of the fourth straight segment 230. The fifth straight segment 160 can improve the heating efficiency of the first heating tube 100, and at the same time can reduce the overall length of the electric heater to meet the needs of smaller electric water heaters. When the flange 600 is fixedly connected to the first connecting end on the first heating tube 100 and the second connecting end on the second heating tube 200, the fixing clamp 300 is also used to fix the first free end and the second free end, that is, the end of the fifth straight segment 160 is fixed to the end of the fourth straight segment 230, thereby improving the structural firmness of the electric heater and avoiding collision between the first heating tube 100 and the second heating tube 200 during transportation and heating. Specifically: Figure 2As shown, the fixing clamp 300 includes an upper clamp body 310 and a lower clamp body 320 which are symmetrically connected in the Z-axis direction. A first arc-shaped clamping portion 311 is provided at both ends of the upper clamp body 310, and a second arc-shaped clamping portion 321 is provided at both ends of the lower clamp body 320. When installing the fixing clamp 300, the upper clamp body 310 and the lower clamp body 320 are symmetrically arranged at intervals in the Z-axis direction, and the end of the fifth straight line segment 160 and the end of the fourth straight line segment 230 are respectively matched with two pairs of the first clamping portion 311 and the second clamping portion 321. The upper clamp body 310 and the lower clamp body 320 are combined and fixed, so that the end of the fifth straight line segment 160 and the end of the fourth straight line segment 230 are respectively clamped between each pair of the first clamping portion 311 and the second clamping portion 321, and the first arc-shaped clamping portion 311 and the second arc-shaped clamping portion 321 can match the round tube body of the heating tube. In this embodiment, the upper clamp body 310 and the lower clamp body 320 are connected by welding. In other embodiments, other connection methods may be used.

[0034] Since the connection between the second heating wire 250 and the second conductive lead rod 240 is set at the third straight segment 210, and the connection between the first heating wire 150 and the first conductive lead rod 140 is set at the first inclined segment 120, it can prevent the heat generated by the first heating tube 100 from being directly transferred upward to the bent connection between the third straight segment 210 and the second inclined segment 220, thereby effectively preventing the bent connection between the third straight segment 210 and the second inclined segment 220 from being affected by the first heating tube 100 during the heating process, thereby effectively improving the service life of the second heating tube 200.

[0035] Furthermore, the electric heater also includes a first blind tube 400 and a second blind tube 500 both extending along the X-axis direction, one end of the first blind tube 400 is connected to the flange 600, and the other end of the first blind tube 400 extends to the outside of the bending point between the third straight segment 210 and the second inclined segment 220, the length of the first blind tube 400 is greater than the length of the third straight segment 210, and a first temperature probe is provided at the other end of the first blind tube 400. When in use, the first temperature probe is connected to the thermal circuit breaker, which can effectively monitor the rapid change of the internal temperature when the water heater is dry-burned. The first temperature probe quickly senses it, and the thermal circuit breaker immediately cuts off the power; and one end of the second blind tube 500 is connected to the flange 600, the length of the second blind tube 500 is less than the length of the first straight segment 110, and a second temperature probe is provided at the other end of the second blind tube 500. At this time, the second blind tube 500 is arranged below the third straight line segment 210, and the second temperature probe is connected to the whole machine display device. The second temperature probe can effectively sense the temperature of the inner tank and will not be affected by the temperature overshoot caused by the local excessive temperature of the heating tube.

[0036] In addition, this embodiment also provides an electric water heater, including the above-mentioned electric heater and an inner tank, wherein the electric heater is arranged in the inner tank, and the flange 600 is connected to the side wall of the inner tank, such as Figure 6 As shown, the direction of the X-axis is the same as the horizontal direction, and the angle between the Z-axis and the gravity direction of the inner pot is 25° to 32°. The setting of this angle can make the first heating tube 100 and the second heating tube 200 staggered from each other in a top view, and the heat from the first heating tube 100 will not be directly transferred to the second heating tube 200 when heating, so that the surface temperature of the heating tubes is uniform and will not affect each other.

[0037] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An electric heater, characterized in that: The electric heater has an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other, and the electric heater comprises: Flange (600); The first heating tube (100) is a first U-shaped structure that is bent. The tube bodies on both sides of the first heating tube (100) are arranged at intervals along the Y-axis. The first U-shaped structure has a first connecting end and a first free end. The first U-shaped structure comprises a first straight segment (110), a first inclined segment (120) and a second straight segment (130) that are bent and connected in sequence from the first connecting end to the first free end. The first straight segment (110) and the second straight segment (130) both extend along the X-axis. The first straight segment (110) and the second straight segment (130) are arranged at intervals along the Z-axis. The first heating tube (100) is provided with two ends thereof at the first connection end, the two ends thereof are connected to the flange (600), first conductive lead rods (140) are provided in the tube bodies at both ends of the first heating tube (100), and a first heating wire (150) is provided in the remaining tube body of the first heating tube (100), the two ends of the first heating wire (150) are respectively connected to the two first conductive lead rods (140), and the connection between the first heating wire (150) and the first conductive lead rod (140) is provided in the first inclined section (120); The second heating tube (200) is arranged at intervals from the first heating tube (100) in the Z-axis direction. The second heating tube (200) is a curved second U-shaped structure. The tube bodies on both sides of the second heating tube (200) are arranged at intervals in the Y-axis direction. The second U-shaped structure has a second connecting end and a second free end. The second U-shaped structure comprises a third straight segment (210), a second inclined segment (220) and a fourth straight segment (230) which are bent and connected in sequence from the second connecting end to the second free end. The third straight segment (210) is parallel to the first straight segment (110). The second inclined segment (220) is parallel to the first inclined segment (12 0), the fourth straight line segment (230) is parallel to the second straight line segment (130), both ends of the second heating tube (200) are arranged at the second connecting end, both ends of the second heating tube (200) are connected to the flange (600), second conductive lead rods (240) are arranged in the tube bodies at both ends of the second heating tube (200), and a second heating wire (250) is arranged in the remaining tube body of the second heating tube (200), both ends of the second heating wire (250) are connected to two second conductive lead rods (240), and the connection between the second heating wire (250) and the second conductive lead rod (240) is arranged in the third straight line segment (210); The first U-shaped structure further comprises a fifth straight segment (160) connected to the second straight segment (130) in a U-shaped bend, the fifth straight segment (160) and the fourth straight segment (230) being arranged on the same straight line, and a fixing clip (300) being arranged between the end of the fifth straight segment (160) and the end of the fourth straight segment (230); The included angle between the first straight section (110) and the first inclined section (120) is 100° to 155°.

2. An electric heater according to claim 1, characterized in that: The fixing clamp (300) comprises an upper clamp body (310) and a lower clamp body (320) which are symmetrically connected in the Z-axis direction; arc-shaped first clamping portions (311) are provided at both ends of the upper clamp body (310); arc-shaped second clamping portions (321) are provided at both ends of the lower clamp body (320); and the end of the fifth straight line segment (160) and the end of the fourth straight line segment (230) are respectively clamped between each pair of the first clamping portions (311) and the second clamping portions (321).

3. An electric heater according to claim 2, characterized in that: The upper clamping body (310) and the lower clamping body (320) are connected by welding.

4. An electric heater according to claim 1, characterized in that: The electric heater further comprises a first blind tube (400) extending along the X-axis direction, one end of the first blind tube (400) being connected to the flange (600), the other end of the first blind tube (400) extending to the outside of a bend between the third straight segment (210) and the second inclined segment (220), the length of the first blind tube (400) being greater than the length of the third straight segment (210), and a first temperature probe being arranged at the other end of the first blind tube (400).

5. The electric heater according to claim 1, characterized in that: The electric heater further comprises a second blind tube (500) extending along the X-axis direction, one end of the second blind tube (500) being connected to the flange (600), the length of the second blind tube (500) being shorter than the length of the first straight segment (110), and a second temperature probe being arranged at the other end of the second blind tube (500).

6. An electric water heater, characterized in that: It comprises the electric heater as claimed in any one of claims 1 to 5, and also comprises an inner tank, wherein the electric heater is arranged in the inner tank, the flange (600) is connected to the side wall of the inner tank, the direction of the X-axis is in the same direction as the horizontal direction, and the angle between the Z-axis and the gravity direction of the inner tank is 25°~32°.

Images