An instant heating device and an electronic toilet

Abstract

The present invention discloses an instant heating device and an electronic toilet. The instant heating device includes a housing and a heating element accommodated in the housing. A heating chamber is provided in the housing, and the heating chamber has a water outlet at its upper part. It is characterized in that: it further includes a first temperature controller for controlling the heating element to stop heating when the water temperature in the heating chamber reaches a preset temperature T1. A water storage part is formed in the heating chamber between the horizontal plane where the highest point of the heat transfer surface of the heating element is located and the water outlet. The volume V1 of the water storage part is not less than the volume V2 of the water reduced in the heating chamber within a time t, and the time t is the time required for the water inlet to suddenly stop until the first temperature controller stops the heating element from heating. This technical solution can ensure that the heating element will not be exposed above the water surface within the time t, avoiding dry burning and damage, and has a simple structure and low cost.

Description

Technical Field

[0001] The present invention relates to an instant heating device, in particular to an instant heating device applied to an electronic toilet. Background Art

[0002] Warm water washing is the most basic function of an electronic toilet. The common water heating methods for existing electronic toilets are storage heating type and instant heating type. Among them, instant heating has been gradually popularized and widely used due to its own advantages. Instant heating generally uses a ceramic heating tube. When the water temperature is too high, the ceramic heating tube will be stopped from heating by a temperature controller to avoid hot water contacting the human body. However, in the case of a sudden water supply interruption in the existing instant heating device, the ceramic heating tube may dry burn and be damaged. To solve this problem, a solution of a relay plus a dual NTC comparison circuit is generally adopted. The circuit involved in this solution is extremely complex, occupies a large space on the PCBA, and has a high cost. Summary of the Invention

[0003] In view of this, the present invention provides an instant heating device, which overcomes the deficiencies of the prior art described in the background art.

[0004] To achieve the above object, an instant heating device of the present invention includes a housing and a heating element received in the housing. A heating cavity is provided in the housing, and the heating cavity has a water outlet at its upper part. It is characterized in that: it further includes a first temperature controller for controlling the heating element to stop heating when the water temperature in the heating cavity reaches a preset temperature T1. A water storage part is formed in the heating cavity between the horizontal plane where the highest point of the heat transfer surface of the heating element is located and the water outlet. The volume V1 of the water storage part is not less than the volume V2 of the water reduced in the heating cavity within a time t, and the time t is the time required for the first temperature controller to stop the heating element from heating after the water supply suddenly stops.

[0005] Preferably, the volume V1 of the water storage part is 1.05 - 5 times the volume V2 of the water reduced in the heating cavity within the time t.

[0006] Preferably, the first temperature controller has a temperature sensing element disposed in the heating cavity, and the distance between the temperature sensing element and the outer peripheral surface of the heating element is 1 - 10 mm.

[0007] Preferably, the heating element has an inner peripheral surface and an outer peripheral surface, and the inner peripheral surface and the outer peripheral surface are respectively formed as an inner heat transfer surface and an outer heat transfer surface. Water flows into the heating cavity through heat transfer on the inner peripheral surface of the heating element, and the water in the heating cavity is heated through heat transfer on the outer peripheral surface of the heating element and then flows out from the water outlet.

[0008] Preferably, the heating element is located at a non - central position in the heating cavity in the vertical direction, but at the lower part of the heating cavity.

[0009] Preferably, the axis L1 of the heating element is parallel to the center line L2 of the heating chamber, and L2 is above L1.

[0010] Preferably, it further includes a mixing chamber communicated with the water outlet of the heating chamber, and the mixing chamber is horizontally arranged with the heating chamber.

[0011] Preferably, it further includes a mixing chamber, which includes a first chamber located above the heating chamber and a second chamber horizontally arranged with the heating chamber. The first chamber is communicated with the water outlet of the heating chamber, and the second chamber is communicated with the first chamber.

[0012] Preferably, it further includes a second thermostat for controlling the heating element to stop heating when the water temperature in the mixing chamber reaches a preset temperature T2, and T1 is greater than T2.

[0013] The present application further provides an electronic toilet, including the above-mentioned instant heating device for heating the flushing water of the electronic toilet.

[0014] Compared with the background technology, the technical solution of the present invention can ensure that the heating element will not be exposed above the water surface within time t, avoid dry burning and damage, and has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the overall structural schematic diagram of the instant heating device of the present invention;

[0016] Figure 2 is the side view of the overall structure of the instant heating device of the present invention;

[0017] Figure 3 is Figure 2 the A-A cross-sectional view of

[0018] Figure 4 is Figure 3 the B-B cross-sectional view of

[0019] Figure 5 is the cross-sectional view of another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0021] As Figures 1 to 4The instant heating device shown includes a housing 10, a heating element 20, and a first temperature controller 40. A heating chamber 30 is provided inside the housing 10, and the heating chamber 30 has a water outlet 31 at its upper part. The heating element 20 is housed inside the housing 10. In this embodiment, the heating element 20 is a cylindrical ceramic heating tube, and its inner peripheral surface 21 and outer peripheral surface 22 are respectively formed as an inner heat transfer surface and an outer heat transfer surface. Water flows into the inner peripheral surface 21 of the heating element and transfers heat into the heating chamber 30, and the water in the heating chamber 30 transfers heat through the outer peripheral surface 22 of the heating element and then flows out from the water outlet 31. A water storage part 32 is formed in the heating chamber 30 between the horizontal plane where the highest point of the heat transfer surface of the heating element (the outer peripheral surface 22 in this embodiment) is located and the water outlet 31. The first temperature controller 40 is used to control the heating element 20 to stop heating when the water temperature in the heating chamber 30 reaches a preset temperature T1, and the volume of the water storage part 32 is not less than the volume of the water reduced in the heating chamber within a time t, where the time t is the time (unit: second) required from the sudden stop of water inlet to the first temperature controller 40 stopping the heating of the heating element 20.

[0022] Specifically, the following parameters can be set for reference: η is the thermal efficiency (constant), P is the power (unit: watt / second), C is the specific heat capacity of water (C = 4200 joules / kg•°C), m is the mass (unit: kilogram), ΔT is the temperature rise (unit: °C), ρ is the density of water (ρ = 1 g / cm 3 = 10 -3 kg / cm 3 = 10 -3 kg / ml 3 ), V is the volume of water (unit: cm 3 ). The unit conversion involved: 1 kilowatt-hour = 3600000 joules, that is, 1 watt•second = 1 joule. Since η•P•t = C•m•ΔT = C•ρ•V•ΔT, so t = (C•ρ•V•ΔT) / (η•P). Thus, the volume of the water storage part can be calculated according to the size of the heating chamber. This is not limiting, and those skilled in the art can also obtain the volume of the water storage part by other means.

[0023] The first temperature controller 40 has a temperature sensing element 41 disposed in the heating chamber 30, and the distance L between the temperature sensing element 41 and the outer peripheral surface 22 of the heating element is preferably 1 - 10 mm. In this way, it can be ensured that the first temperature controller does not make a wrong judgment during the normal heating process of the instant heating device; at the same time, when the water inlet suddenly stops, the first temperature controller can quickly process the feedback and stop the heating of the heating element.

[0024] In order to make the volume of the heating chamber 30 relatively small while meeting the volume requirement of the water storage part 32, it is preferred that the axis L1 of the heating element 20 is parallel to the center line L2 of the heating chamber, and L2 is above L1. Taking the plane of the axis L1 of the heating element in the horizontal direction as the reference boundary, the volume of the cavity in the heating chamber above L1 is larger than the volume of the cavity below L1. Therefore, the heating element 20 is not located in the middle of the heating chamber 30 in the vertical direction, but is closer to the lower part of the heating chamber 30, and more water is retained above the heating element 20 than below it. When the water supply suddenly stops, the water vaporized by the heating element 20 can be quickly replenished.

[0025] The instant heating device further includes a second temperature controller 60 and a mixing chamber 50 communicated with the water outlet 31 of the heating chamber. The mixing chamber 50 and the heating chamber 30 are arranged transversely. The water outlet 31 of the heating chamber is preferably arranged at the top of the heating chamber. The second temperature controller 60 is used to stop the heating of the heating element 20 when the water temperature in the mixing chamber 50 reaches a preset temperature T2, so as to prevent the water with too high temperature from being sprayed onto the human body. Since the water temperature rising speed in the heating chamber 30 is higher than that in the mixing chamber 50, T1 is greater than T2 (for example, T1 is 65 °C and T2 is 45 °C). Thus, it can be avoided that under normal heating conditions, the first temperature controller 40 acts and causes a malfunction before the water temperature in the mixing chamber 50 reaches the scald protection temperature. The first temperature controller and the second temperature controller are preferably reset in a non-automatic reset manner, such as manual reset or power-off reset.

[0026] Under normal circumstances, water flows into the inner peripheral surface 21 of the heating element from the water inlet of the heating element 20 for heat transfer, and the water flowing out from the inner peripheral surface 21 of the heating element enters the heating chamber 30. The water in the heating chamber 30 is further heated through the outer peripheral surface 22 of the heating element. The heated water gradually fills the heating chamber 30, and then flows from the water outlet 31 at the top of the heating chamber to the mixing chamber 50 on the side of the heating chamber, and finally is supplied by the mixing chamber 50 to the spray rod of the electronic toilet for local cleaning of the human body.

[0027] When a sudden water supply stop occurs during the heating process, since the water temperature in the heating chamber will not reach T1 instantaneously, the first temperature controller will not stop heating the heating element instantaneously. At this time, the heating chamber 30 is still full of water, and the heating element 20 will continue to heat until the temperature sensing element detects that the water temperature in the heating chamber 30 reaches T1, and the first temperature controller stops heating the heating element 20. During the heating time t of the heating element 20, the water near the heating element 20 in the heating chamber 30 is first vaporized, and then replenished by the water above the heating element 20, resulting in a decrease in the water level in the heating chamber 30. To ensure that the heating element 20 is always immersed in the stored water in the heating chamber 30 to avoid damage to the heating element due to dry burning, the volume V1 of the water storage part should not be less than the volume V2 of the water reduced in the heating chamber during the time t. The volume V1 of the water storage part is preferably (1.05 - 5)V2.

[0028] Such asFigure 5 As shown, in another embodiment, the mixing chamber includes a first chamber 51 located above the heating chamber and a second chamber 52 arranged horizontally with respect to the heating chamber. The first chamber 51 is communicated with the water outlet 31 of the heating chamber, and the second chamber 52 is communicated with the first chamber 51. Since the first chamber 51 is provided, by setting the size of the water outlet 31, when the water level in the heating chamber 30 drops, the water in the first chamber 51 can, to a certain extent, supplement the heating chamber 30. Therefore, the volume of the heating chamber 30 can be appropriately reduced. Thus, the following design can also be made: the axis L1 of the heating element 20 coincides with the center line L2 of the heating chamber, that is, the heating element 20 is located in the middle of the heating chamber 30 in the vertical direction.

[0029] Although the above description is directed to a heating element that transfers heat through its inner and outer surfaces, it can be understood that the present invention is also applicable to other types of heating elements.

[0030] The principles and preferred embodiments of the present invention have been described above. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept herein through the above teachings or the techniques or knowledge in related fields. And any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. An instant heating device, comprising a housing and a heating element received in the housing. A heating chamber is provided in the housing, and the heating chamber has a water outlet at its upper part; characterized in that: It further includes a first temperature controller for controlling the heating element to stop heating when the water temperature in the heating cavity reaches a preset temperature T1. A water storage part is formed in the heating cavity between the horizontal plane where the highest point of the heat transfer surface of the heating element is located and the water outlet. The volume V1 of the water storage part is not less than the volume V2 of the water reduced in the heating cavity within a time t, where the time t is the time required from the sudden stop of water inlet to the first temperature controller stopping the heating element from heating. The heating element is located at a non - central position in the vertical direction in the heating cavity, but at the lower part of the heating cavity.

2. The instant heating device according to claim 1, characterized in that: The volume V1 of the water storage part is 1.05 - 5 times the volume V2 of the water reduced in the heating cavity within the time t.

3. The instant heating device according to claim 1, characterized in that: The heating element has an inner circumferential surface and an outer circumferential surface, and the inner circumferential surface and the outer circumferential surface are respectively formed as an inner heat transfer surface and an outer heat transfer surface. Water flows into the inner circumferential surface of the heating element for heat transfer into the heating cavity, and the water in the heating cavity is heat - transferred through the outer circumferential surface of the heating element and then flows out from the water outlet.

4. The instant heating device according to claim 3, characterized in that: The first temperature controller has a temperature - sensing element arranged in the heating cavity, and the distance between the temperature - sensing element and the outer circumferential surface of the heating element is 1 - 10 mm.

5. The instant heating device according to claim 3, characterized in that: The axis L1 of the heating element is parallel to the center line L2 of the heating cavity, and L2 is above L1.

6. The instant heating device according to claim 1, characterized in that: It further includes a mixing cavity communicated with the water outlet of the heating cavity, and the mixing cavity is horizontally arranged with the heating cavity.

7. The instant heating device according to claim 1, characterized in that: It further includes a mixing cavity, which includes a first cavity located above the heating cavity and a second cavity horizontally arranged with the heating cavity. The first cavity is communicated with the water outlet of the heating cavity, and the second cavity is communicated with the first cavity.

8. The instant heating device according to claim 6 or 7, characterized in that: It further includes a second temperature controller for controlling the heating element to stop heating when the water temperature in the mixing cavity reaches a preset temperature T2, and T1 is greater than T2.

9. An electronic toilet, characterized in that: It includes an instant - heating device according to any one of claims 1 - 8 for heating the flushing water of the electronic toilet.

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