Heater and ventilation device using the same

Abstract

This utility model provides a heater and a ventilation device using the same. The heater includes a heating part and a heat exchange part. The heating part is used to generate heat, and the heat exchange part forms a heat conduction with the heating part. The heat exchange part is used to exchange heat between the heating part and the air. The heating part includes a heating element group. At least a portion of the heating elements in the heating element group has a first step resistance, and at least another portion of the heating elements in the heating element group has a second step resistance. The first step resistance should be configured to be greater than the second step resistance.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a heater and a ventilation device using the same. Background Technology

[0002] Heaters can be used in ventilation equipment and are suitable for heating media, specifically gases such as air. Taking a PTC heater based on a positive temperature coefficient (PTC) material as an example, a PTC heater can only be used with one rated voltage. Therefore, heat exchange equipment equipped with a PTC heater can only be used under one rated voltage. When the operating voltage of the power supply scenario in which the heat exchange equipment is located does not meet the rated voltage, the performance of the heater will be limited, such as being unable to output warm air that meets the target temperature.

[0003] To address the aforementioned issues, input voltage conversion devices such as transformers are typically used to convert the operating voltage connected to the heater to its rated voltage. However, using voltage conversion devices increases the cost of the air supply system. Utility Model Content

[0004] In view of the above-mentioned technical problems, the present invention provides a heater and a ventilation device using the same, so as to at least partially solve the above problems.

[0005] This utility model provides a heater, including: a heating part and a heat exchange part, wherein the heating part is used to generate heat, the heat exchange part forms a heat conduction with the heating part, and the heat exchange part is used to exchange heat between the heating part and the air, the heating part includes a heating element group, at least a portion of the heating elements in the heating element group has a first step resistance, and at least another portion of the heating elements in the heating element group has a second step resistance; wherein the first step resistance is configured to be greater than the second step resistance.

[0006] In some illustrative embodiments, the heating element group includes a first heating element group and a second heating element group, which are arranged side by side along a first direction.

[0007] In some illustrative embodiments, the first heating element group includes at least one first heating element, and the second heating element group includes at least one second heating element; wherein the first heating element is adapted to the first rated voltage, the second heating element is adapted to the second rated voltage, and the first rated voltage is configured to be greater than the second rated voltage.

[0008] In some illustrative embodiments, the first heating element group has at least two first heating elements, which are arranged sequentially along a second direction, and the second direction forms an angle with the first direction.

[0009] In some illustrative embodiments, the first heating element group further includes at least one second heating element, which is arranged sequentially or alternately with the first heating element along a second direction, and the second direction forms an angle with the first direction.

[0010] In some illustrative embodiments, the first heating element group is provided with different numbers of the first heating elements and the second heating elements; or, the first heating element group is provided with the same number of the first heating elements and the second heating elements.

[0011] In some illustrative embodiments, the second heating element group has at least two second heating elements, which are arranged sequentially along a second direction, the second direction forming an angle with the first direction.

[0012] In some illustrative embodiments, the second heating element group further includes at least one of the first heating elements; the second heating elements and the first heating elements are arranged sequentially or alternately along a second direction, and the second direction forms an angle with the first direction.

[0013] In some illustrative embodiments, the second heating element group is provided with different numbers of the first heating element and the second heating element; or, the second heating element group is provided with the same number of the first heating element and the second heating element.

[0014] In some illustrative embodiments, the heating element group further includes at least one third heating element group; the third heating element group includes at least one of the first heating elements and / or at least one of the second heating elements.

[0015] In some illustrative embodiments, at least one of the first heating element group, the second heating element group, and the third heating element group further includes a dummy element; the dummy element is arranged at intervals from the first heating element and / or the second heating element along a second direction, and the second direction forms an angle with the first direction.

[0016] In some illustrative embodiments, the sum of the number of heating elements and the number of dummy elements in at least two of the first heating element group, the second heating element group, and the third heating element group is configured to be the same.

[0017] In some illustrative embodiments, at least one of the first heating element group, the second heating element group, and the third heating element group further includes a third heating element; the third heating element is arranged sequentially with the first heating element and / or the second heating element along a second direction, the second direction forming an angle with the first direction; wherein the third heating element has a third step resistor, the third step resistor being different from the first step resistor and the second step resistor.

[0018] In some illustrative embodiments, the total power of the heating element is configured as the sum of the power of each of the heating elements.

[0019] This utility model also provides a ventilation device, comprising: a basket; an air inlet disposed in the basket for supplying air in; an air outlet disposed in the basket for supplying air out; an air supply section disposed in the basket for guiding air through the air inlet to the air outlet; and a heater disposed upstream of the air outlet for heating the flowing air.

[0020] Based on the aforementioned heater and its associated ventilation equipment, the core of the heater is the heating element assembly. This assembly integrates two types of heating elements with different step resistances: some have a first step resistance, and others have a second step resistance. By flexibly configuring the number, arrangement, and combination of these heating elements with different step resistances, the heating element can adapt to different operating voltage conditions and precisely meet the total power requirements of each scenario. This design enables the heater and its associated ventilation equipment to operate stably over a relatively wide operating voltage range and consistently maintain their corresponding heating performance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a heater according to one illustrative embodiment of the present invention, showing a second embodiment;

[0022] Figure 2 This is a schematic diagram of the structure of a heater according to an illustrative embodiment of the present invention, showing a third embodiment;

[0023] Figure 3 This is a schematic diagram of the structure of a heater according to an illustrative embodiment of the present invention, showing a fourth embodiment;

[0024] Figure 4 This is a schematic diagram of the structure of a heater according to an illustrative embodiment of the present invention, showing the fifth embodiment;

[0025] Figure 5 This is a schematic diagram of the structure of a heater according to an illustrative embodiment of the present invention, showing the sixth embodiment;

[0026] Figure 6 This is a schematic diagram of the structure of a heater according to an illustrative embodiment of the present invention, showing the seventh embodiment;

[0027] Figure 7 This is a schematic diagram of the structure of a ventilation device according to an illustrative embodiment of the present invention, showing the eighth embodiment.

[0028] In the accompanying drawings, the meanings of the reference numerals are as follows:

[0029] 100. Heater; 110. Heating section; 111. First heating element group; 112. Second heating element group; 113. First heating element; 114. Second heating element; 115. Third heating element group; 116. Dummy element; 120. Heat exchange section;

[0030] 200. Ventilation equipment; 210. Casing; 220. Air supply unit; 221. Fan blade; 222. Motor; 223. Volute; 230. Air inlet; 240. Air outlet. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0032] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0033] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0034] When using expressions such as "at least one of A, B, and C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C. Similarly, when using expressions such as "at least one of A, B, or C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C.

[0035] The heating section and heat exchange section are the core parts of the heater. The heating section is the heat source of the heater and is suitable for generating heat. The heat exchange section forms a heat conduction with the heating section to exchange the heat generated by the heating section with the external gas medium (usually air), and finally achieves the heating of the target space.

[0036] In terms of the implementation of the heating element, electric heating is a common choice. Specifically, it can use a PTC heating element based on a positive temperature coefficient (PTC) material, which has self-limiting temperature characteristics. When the temperature of the PTC heating element reaches the minimum Curie temperature (critical point), the resistance of the PTC heating element will reach a step resistance (also known as high-resistance resistance or Curie resistance), and then increase sharply, thereby limiting the current and preventing overheating. However, the electrical characteristics of PTC heating elements currently on the market, when used in heaters, are optimized for specific rated voltages (e.g., 100V, 110V, 220V, or 240V), and therefore can only be adapted to this one operating voltage.

[0037] This limitation means that heaters equipped with PTC heating elements can only operate normally in electrical environments where their rated voltage matches. If the operating voltage of the environment differs from the rated voltage, the heater's performance will be significantly reduced. For example, when the operating voltage is lower than the rated voltage, the heater may not be able to provide enough heat to reach the user-set target temperature, resulting in an output warm air temperature that does not meet the user's needs.

[0038] In view of this, how to provide a heater that can operate over a wide voltage range and a ventilation device that uses it has become an urgent technical problem to be solved.

[0039] The following is combined Figures 1 to 6 The structure of the embodiments of this utility model will be described in detail below.

[0040] First Embodiment

[0041] This invention provides a heater 100, including a heating section 110 and a heat exchange section 120. The heating section 110 generates heat, and the heat exchange section 120 forms a heat conduction connection with the heating section 110, serving to exchange heat between the heating section 110 and the air. The heating section 110 includes a group of heating elements, at least a portion of which has a first stepped resistance, and at least another portion of which has a second stepped resistance. The first stepped resistance is configured to be greater than the second stepped resistance.

[0042] In some illustrative embodiments, heating elements with different step resistances (such as the first heating element 113 and the second heating element 114 described below) in the heating element group are adapted to different first rated voltages or second rated voltages. Specifically, this can be understood as at least two types of heating elements in the heating element group being configured with different step resistances (also referred to as high-resistance resistances). Given that the first rated voltage is greater than the second rated voltage, the first step resistance of the heating element adapted to the first rated voltage should be configured to be greater than the second step resistance of the heating element adapted to the second rated voltage. The heating elements include, but are not limited to, ceramic heating elements, specifically heating elements based on positive temperature coefficient (PTC) materials.

[0043] In this implementation, by configuring a heating element group consisting of at least two types of heating elements adapted to different rated voltages, the heater 100 can operate at a working voltage that meets either the first or second rated voltage. This allows the heater 100 to be adapted to a wider range of working voltages, thus expanding the power application scenarios of the heater 100.

[0044] When the first operating voltage of the power consumption scenario is close to or equal to the first rated voltage, the heating element in the heating element group that is adapted to the first rated voltage outputs rated power, while the heating element adapted to the second rated voltage is in an overvoltage state at this time, and therefore also outputs rated power. In this way, the heater 100 can operate at the first rated power matching the first operating voltage.

[0045] When the second operating voltage in another power consumption scenario is close to or equal to the second rated voltage (i.e., lower than the first rated voltage), the heating elements in the heating element group adapted to the second rated voltage output at rated power, while the heating elements adapted to the first rated voltage are in an undervoltage state and therefore output at a lower power than rated power. Therefore, by designing the number of heating elements in the heating element group adapted to different rated voltages (i.e., the first rated voltage and the second rated voltage), the heater 100 can operate at the second rated power matching the second operating voltage. In this way, without the need for voltage conversion components (such as transformers), the heater 100 and the ventilation equipment 200 configured with the heater 100 can maintain their corresponding heating performance within a relatively wide operating voltage range.

[0046] It should be noted that, while the heating elements adapted to the second rated voltage are under overvoltage when operating at the first voltage, due to the self-limiting temperature characteristics of PTC material, when these heating elements reach the minimum Curie temperature (critical point), their resistance will reach a step resistance (also known as high-resistivity resistance or Curie resistance). That is, the minimum resistance at the resistance jump at the minimum Curie temperature (critical point) is still much higher than the low-resistivity resistance at low temperatures. Therefore, the current to these heating elements can be limited by their step resistance, maintaining a constant surface temperature. This prevents the heating elements from being damaged due to overvoltage or from overheating.

[0047] According to an embodiment of the present invention, the heating element group of the heater 100 includes a first heating element group 111 and a second heating element group 112, which are arranged side by side along a first direction. The first direction can be understood as... Figures 1 to 6 The up and down directions are shown.

[0048] In some illustrative embodiments, the heating elements in the first heating element group 111 and the heating elements in the second heating element group 112 are arranged side by side at intervals along a first direction to form air circulation channels on both sides of the first heating element group 111 and the second heating element group 112. Furthermore, a heat exchange section 120 is disposed in the aforementioned air circulation channels.

[0049] In some illustrative embodiments, the heat exchange section 120 includes, but is not limited to, employing a heat exchanger. Specifically, the heat exchange section 120 has terminals and abuts against corresponding first heating element group 111 and / or second heating element group 112 via these terminals to facilitate heat conduction. This increases the heat exchange area of ​​the heating element 110, allowing the heat generated by the heating element 110 to be transferred to the heat exchange section 120, and ensuring sufficient heat exchange between the air flowing through the airflow channel and the heat exchange section 120, thereby generating hot air (i.e., hot airflow) that flows directionally from the air inlet side to the air outlet side of the airflow channel.

[0050] In some illustrative embodiments, the heat exchanger used in the heat exchange section 120 includes, but is not limited to, fins, and can be made of aluminum, copper, or any other material with good thermal conductivity. Taking the finned heat exchange section 120 as an example, multiple fins extend along the airflow channel, specifically in a second direction, which forms an angle with the first direction, for example, 60°, 70°, 80°, 90°, 100°, 110°, or any other arbitrary angle. More specifically, the fins include, but are not limited to, flat fins, corrugated fins, spiral fins, staggered fins, and other fin structures and combinations thereof. The second direction can be understood as... Figures 1 to 6The left and right directions are shown. In the following embodiments, they will also be in the following manner. Figures 1 to 6 As shown, the first and second orthogonal directions are explained.

[0051] In some illustrative embodiments, the first heating element group 111 and the second heating element group 112 can be electrically connected by being connected in series or in parallel.

[0052] According to an embodiment of the present invention, the first heating element group 111 includes at least one first heating element 113, and the second heating element group 112 includes at least one second heating element 114. The first heating element 113 is adapted to a first rated voltage, and the second heating element 114 is adapted to a second rated voltage, wherein the first rated voltage is configured to be greater than the second rated voltage.

[0053] In some illustrative embodiments, the first rated voltage includes, but is not limited to, being configured as 240V, 220V, and any other voltage. Similarly, the second rated voltage includes, but is not limited to, being configured as 110V, 100V, and any other voltage.

[0054] According to an embodiment of the present invention, the first heating element group 111 has at least two first heating elements 113, which are arranged sequentially along a second direction, and the second direction forms an angle with the first direction.

[0055] According to an embodiment of the present invention, the second heating element group 112 has at least two second heating elements 114, which are arranged sequentially along a second direction, and the second direction forms an angle with the first direction.

[0056] According to an embodiment of the present invention, the total power of the heating section 110 is configured as the sum of the power of each heating element.

[0057] In some illustrative embodiments, the total power of the heating element 110 can be understood as the sum of the power of each heating element. Specifically, for the first heating element 113 and the second heating element 114, it can be understood as follows: [Equation 1]

[0058] W 总 = W1×n+ W2×m Equation 1

[0059] In Equation 1, W 总 W1 represents the total power of the heating element 110, W2 represents the power of each first heating element 113, W2 represents the power of each second heating element 114, n represents the number of first heating elements 113, and m represents the number of second heating elements 114.

[0060] In some illustrative embodiments, the first heating element group 111 includes a plurality of first heating elements 113, and the second heating element group 112 includes a plurality of second heating elements 114. To ensure that the heating section 110 having the first heating element group 111 and the second heating element group 112 can operate at the rated power corresponding to different operating voltages, the specific number of the first heating elements 113 and the second heating elements 114 needs to be designed to configure an appropriate number of first heating elements 113 and second heating elements 114, i.e., n and m.

[0061] The following description uses a first rated voltage of 220V and a second rated voltage of 110V as an example. It should be noted that the first and second rated voltages are illustrative and can be any other voltage value.

[0062] When the first operating voltage in a power consumption scenario is close to the first rated voltage, it can be understood that the first operating voltage is 220V. The heater 100 operates under the first rated voltage condition and needs to reach the first rated total power. The first rated total power can be an empirical value and / or a calculated value, for example, W. 总 =2600W.

[0063] Under the premise of constant airflow velocity, based on the aforementioned first and second rated voltages, in this power consumption scenario, the first operating voltage meets the first rated voltage and is higher than the second rated voltage. Therefore, both the first heating element 113 and the second heating element 114 can operate at their rated power under the first operating voltage. For example, W1 = 120W and W2 = 120W. Based on Equation 1 above, Equation 2 can be obtained:

[0064] 2600W = 120W × n + 120W × m (Equation 2)

[0065] Similarly, when the second operating voltage in a power consumption scenario is close to the second rated voltage, it can be understood as the second operating voltage being 100V. The heater 100 operates under the second rated voltage condition and needs to reach the second rated total power. Here, the second rated total power can be an empirical value and / or a calculated value, for example, W. 总 =1650W, this value is obtained based on the carrying capacity of the wires (or wires) in the household circuit, such as the preset current value (specifically it can be 10A, 15A, 20A and other arbitrary values).

[0066] Based on the aforementioned first and second rated voltages, in this power consumption scenario, the second operating voltage does not meet the first rated voltage. Therefore, the first heating element 113 will operate under an undervoltage condition, for example, W1 = 43W. The second operating voltage meets the second rated voltage; therefore, the second heating element 114 will operate at its rated power under this second operating voltage, for example, W2 = 120W. Based on Equation 1 above, Equation 3 can be obtained:

[0067] 1650W = 43W × n + 120W × m (Equation 3)

[0068] Based on Equations 2 and 3 above, we can obtain n≈12.34, m≈9.33.

[0069] Therefore, n and m can be rounded, such as:

[0070] For n=12, m=9; n=13, m=9, etc., the specific values ​​of n and m should be chosen such that equation 3 above is less than or equal to 1650W, while equation 2 above is also less than or equal to 2600W (the rated total power under the corresponding rated voltage). In other words, the preferred number of heating elements should simultaneously satisfy both power requirements.

[0071] Taking n=12 and m=9 as an example, the first heating element group 111 can be configured to have 12 first heating elements 113, and the second heating element group 112 can be configured to have 9 second heating elements 114.

[0072] In this embodiment, by configuring the number of the first heating elements 113 (i.e., m) and / or the number of the second heating elements 114 (i.e., n), the heating element groups (i.e., the first heating element group 111 and the second heating element group 112) in the heating section 110 can be configured with a suitable number of first heating elements 113 and second heating elements 114, thus achieving wide voltage matching for the aforementioned 220V and 110V operating voltages. This allows the heater 100 to adapt to a wider range of operating voltages without the need for voltage conversion accessories, thereby expanding the power application scenarios of the heater 100. It should be understood that the embodiments of this utility model are not limited thereto.

[0073] For example, the number of the first heating element 113 and / or the second heating element 114 can also be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 and other arbitrary values.

[0074] For example, the first heating element 113 and / or the second heating element 114 are also arranged in groups, and each group can have 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and any other number of heating elements.

[0075] In some illustrative embodiments, at least two first heating elements 113 may be arranged continuously along the second direction, or they may be arranged at intervals. Similarly, at least two second heating elements 114 may be arranged continuously along the second direction, or they may be arranged at intervals.

[0076] In some other illustrative embodiments, the first heating element group 111 and / or the second heating element group 112 further include a third heating element. The third heating element is arranged sequentially with the first heating element 113 and / or the second heating element 114 along a second direction, the second direction forming an angle with the first direction. The third heating element has a third step resistor, which is different from the first and second step resistors.

[0077] Similar to the above embodiments, the third heating element with a third step resistance can be adapted to a third rated voltage. The specific adaptation method is similar to the above embodiments, and therefore will not be repeated. That is, the heater 100, which is simultaneously equipped with the first heating element 113, the second heating element 114, and the third heating element, can be further adapted to three different rated voltages, namely the first rated voltage, the second rated voltage, and the third rated voltage, thus allowing the heater 100 to be used within a wider voltage range.

[0078] Second Embodiment

[0079] Reference Figure 1 As shown, in some other embodiments, the number of first heating elements 113 is configured to be the same as the number of second heating elements 114, such as m=n=7.

[0080] The first motor heating element group and the second heating element group 112 can then be arranged side by side along the first direction. Specifically, the seven first heating elements 113 in the first heating element group 111 can be arranged sequentially along the second direction. Similarly, the seven second heating elements 114 in the second heating element group 112 can also be arranged sequentially along the second direction.

[0081] In this embodiment, by arranging the first heating element 113 and the second heating element 114 as described above, the overall lengths of the first heating element group 111 and the second heating element group 112 are approximately the same. Thus, when the heater 100 operates at either the first or second rated power, the length of the airflow channel is approximately similar, ensuring sufficient heat exchange in both cases.

[0082] Third Embodiment

[0083] According to an embodiment of the present invention, the first heating element group 111 further includes at least one second heating element 114. The second heating element 114 and the first heating element 113 are arranged sequentially or alternately along a second direction, and the second direction forms an angle with the first direction. Sequential arrangement can be understood as at least two first heating elements 113 and / or at least two second heating elements 114 being arranged continuously, and alternating arrangement can be understood as at least one second heating element 114 (or first heating element 113) being disposed between at least two first heating elements 113 (or second heating elements 114).

[0084] Reference Figure 2 As shown, in some other embodiments, the number of first heating elements 113 is configured to be different from the number of second heating elements 114, such as m=6, n=10.

[0085] Since the number of second heating elements 114 is configured to be greater than the number of first heating elements 113, as in the arrangement of the second embodiment, the length of the second heating element group 112 will be greater than the length of the first heating element group 111, thus wasting the limited space of the heater 100.

[0086] Therefore, a portion of the second heating element 114 can be disposed within the first heating element group 111 to maintain the overall length of the first heating element group 111 and the second heating element group 112 being approximately the same.

[0087] Similarly, refer to Figure 3 As shown in the embodiment of the present invention, the second heating element group 112 further includes at least one first heating element 113. The second heating element 114 and the first heating element 113 are arranged sequentially or alternately along a second direction, and the second direction forms an angle with the first direction.

[0088] When the number of first heating elements 113 is configured to be greater than the number of second heating elements 114, some of the first heating elements 113 may also be disposed in the second heating element group 112 to maintain the overall length of the first heating element group 111 and the second heating element group 112 being approximately the same.

[0089] Fourth embodiment

[0090] According to an embodiment of the present invention, the first heating element group 111 is provided with different numbers of first heating elements 113 and second heating elements 114. Alternatively, the first heating element group 111 is provided with the same number of first heating elements 113 and second heating elements 114.

[0091] According to an embodiment of the present invention, the second heating element group 112 is provided with different numbers of the first heating element 113 and the second heating element 114; or, the second heating element group 112 is provided with the same number of the first heating element 113 and the second heating element 114.

[0092] Reference Figure 3 As shown, similar to the second embodiment described above, when the number of the first heating elements 113 is configured to be the same as the number of the second heating elements 114, such as m=n=8, this fourth embodiment adopts an arrangement method different from the second embodiment described above.

[0093] In some illustrative embodiments, the first heating element group 111 includes both a first heating element 113 and a second heating element 114. Specifically, the first heating element 113 and the second heating element 114 are arranged alternately and at intervals along a second direction in the first heating element group 111. Similarly, the first heating element 113 and the second heating element 114 in the second heating element group 112 are also arranged alternately and at intervals along a second direction.

[0094] Furthermore, in addition to the above-described embodiment in which a second heating element 114 (or a first heating element 113) is provided between two adjacent first heating elements 113, two, three, or any other number of second heating elements 114 (or first heating elements 113) may also be provided between two adjacent first heating elements 113 (or second heating elements 114).

[0095] In this implementation, the spaced and alternating arrangement means that, along the airflow direction in the air circulation channel, the air passes through the first heating element 113 and the second heating element 114 spaced and alternatingly. This ensures that the uniformity of air heating is maintained regardless of whether the heater 100 operates at its first rated power or its second rated power.

[0096] Fifth embodiment

[0097] Reference Figure 4 As shown, in some other embodiments, the first heating element group 111 and the second heating element group 112 may each have a first heating element 113 and a second heating element 114. Specifically, a plurality of first heating elements 113 in the first heating element group 111 and the second heating element group 112 are arranged at one end of the heating element group, while a plurality of second heating elements 114 may be arranged at the other end of the heating element group.

[0098] In this embodiment, the first heating element 113 and the second heating element 114 can be arranged in a concentrated manner within the heating element to adapt to uneven airflow through the air circulation channel. For example, it can be applied in the application scenario of multi-blade centrifugal fan blade 221.

[0099] Sixth Embodiment

[0100] According to an embodiment of the present invention, the heating element group further includes at least one third heating element group 115. The third heating element group 115 includes at least one first heating element 113 and / or at least one second heating element 114.

[0101] Reference Figure 5 As shown, when the number of first heating elements 113 and second heating elements 114 configured in the first embodiment is large, the overall length of the heater 100 is limited. Therefore, configuring only the first heating element group 111 and the second heating element group 112 cannot accommodate all the heating elements. To address this, a third heating element group 115 can be added. This third heating element group 115 can be configured according to the actual number of first heating elements 113 and second heating elements 114, so that the overall length of the third heating element group 115 is approximately the same as that of the first heating element group 111 and / or the second heating element group 112.

[0102] In this embodiment, the distribution of heating elements is more uniform through the third heating element group 115. The first heating elements 113 (and second heating elements 114) in the first heating element group 111 and the second heating element group 112 are, but are not limited to, arranged in the same order. The third heating element group 115 can be disposed between the first heating element group 111 and the second heating element group 112.

[0103] In some illustrative embodiments, the first heating element group 111, the second heating element group 112, and the third heating element group 115 are connected in parallel. For example, by controlling the circuit, the heating of the first heating element group 111 is turned on, while the heating of the second heating element group 112 and the third heating element group 115 is turned off to achieve low-level heating; or the heating of the first heating element group 111 is turned off, while the heating of the second heating element group 112 and the third heating element group 115 is turned on to achieve medium-level heating; or the heating of all three heating elements is turned on to achieve high-level heating.

[0104] It should be noted that, in addition to using the third heating element group 115, Figure 5 In addition to the arrangement shown which only has the second heating element 114, only the first heating element 113 can be arranged, or the first heating element 113 and the second heating element 114 can be doped together.

[0105] Seventh Embodiment

[0106] According to an embodiment of the present invention, at least one of the first heating element group 111, the second heating element group 112, and the third heating element group 115 further includes a dummy piece 116. The dummy piece 116 is arranged at intervals from the first heating element 113 and / or the second heating element 114 along a second direction, and the second direction forms an angle with the first direction.

[0107] According to an embodiment of the present invention, the sum of the number of heating elements and dummy elements 116 in at least two of the first heating element group 111, the second heating element group 112 and the third heating element group 115 is configured to be the same.

[0108] Reference Figure 6 As shown, in some other embodiments, the first heating element group 111 may include, but is not limited to, having 7 heating elements, and the second heating element group 112 may have 8 heating elements. This embodiment can be used when the air blowing onto the heater 100 is concentrated in the middle of the heater 100.

[0109] Furthermore, to ensure the assembly and overall integrity of the heater 100, an assembly defect may occur if the number of heating elements in the first heating element group 111 is different from the number of heating elements in the second heating element group 112. Therefore, when the first heating element group 111 has 7 heating elements and the second heating element group 112 has 8 heating elements, a non-heat-generating dummy piece 116 can be used. That is, the dummy piece 116 has the same shape as the heating elements but does not generate heat. This ensures that the first heating element group 111 and the second heating element group 112 have the same length, thereby ensuring the overall integrity of the heater 100.

[0110] Based on similar utility model concepts, in the second to seventh embodiments, the heater 100 has similar or the same features as the first embodiment described above, and also has similar or the same functions based on these features, therefore, it will not be described again.

[0111] Eighth embodiment

[0112] Based on the overall utility model concept, and referring to Figure 7 As shown, this utility model also provides a ventilation device 200, including a basket 210 and a heater 100. The basket 210 has an air inlet 230, an air outlet 240, and an air supply section 220. The air inlet 230 is disposed in the basket 210 for supplying air. The air outlet 240 is disposed in the basket 210 for supplying air. The air supply section 220 is disposed inside the basket 210 for guiding air through the air inlet 230 to the air outlet 240. The heater 100 can be any of the heaters described in the first to seventh embodiments above.

[0113] In some illustrative embodiments, the housing 210 serves as the mounting base for the ventilation device 200 and forms the outer contour of the ventilation device 200. Specifically, the housing 210 includes, but is not limited to, being configured as a hollow cuboid structure, the interior of which is suitable for housing the air supply section 220 and other components.

[0114] In some illustrative embodiments, the basket 210 is provided with an air inlet 230 and an air outlet 240. Specifically, the air inlet 230 is located on the basket 210. In other embodiments, the air inlet 230 may also be located outside the basket 210 and connected to the basket 210 via a pipe. Similarly, the air outlet 240 is also located on the basket 210. In other embodiments, the air outlet 240 may also be located outside the basket 210 and connected to the basket 210 via a pipe.

[0115] In some illustrative embodiments, the air supply section 220 is disposed within the housing 210 and located downstream of the air inlet 230 and upstream of the air outlet 240, for supplying air from the air inlet 230 to the air outlet 240. Specifically, the air supply section 220 includes, but is not limited to, a fan blade 221, a motor 222, and a volute 223. The volute 223 connects the air inlet 230 and the air outlet 240, for supplying air from the air inlet 230 to the air outlet 240. The fan blade 221 is disposed within the volute 223, and the motor 222 is connected to the fan blade 221 for driving the fan blade 221 to rotate.

[0116] In some illustrative embodiments, the air inlet 230, volute 223, fan blades 221, and air outlet 240 form an airflow path for supplying air to the target space. The motor 222 drives the fan blades 221 to rotate. Air, driven by the fan blades 221, enters the housing 210 from the air inlet 230, then enters the volute 223 and fan blades 221, and is finally blown out to the target space through the air outlet 240. The fan blades 221 may include, but are not limited to, centrifugal fan blades 221. In other embodiments, the fan blades 221 may also be axial flow or cross-flow fan blades 221, or other types of fan blades. When the fan blades 221 are of other types, the volute 223 may be omitted, or other types of airflow path walls may be used.

[0117] Based on this, the heater 100 is installed inside the basket 210 and located upstream of the air outlet 240. After the air enters the basket 210 through the air inlet 230, it can pass through the heater 100 and the air outlet 240 in sequence, so that the airflow output through the air outlet 240 is heated hot air (i.e., hot airflow).

[0118] Depending on the different air supply sections 220, the airflow and velocity will have different characteristics. Therefore, the airflow and velocity in different parts of the volute 223 may be uneven. Taking the air supply section 220 using a multi-bladed centrifugal fan 221 as an example, the airflow is often smaller on the side of its tongue (usually a disc or a plate with an arc structure that extends into the initial airflow channel of the volute 223, with a through hole in the center of the tongue) and larger on the side away from the tongue. This will result in uneven airflow through the heater 100.

[0119] Based on the characteristics of the heating section 110 (i.e., PTC heating section 110) configured in the heater 100 in the first to seventh embodiments described above, the resistance of the first heating element 113 and the second heating element 114 increases with increasing temperature. When the minimum Curie temperature (critical point) is reached, the first heating element 113 and the second heating element 114 reach their respective step resistances, at which point the resistance of the first heating element 113 and the second heating element 114 changes abruptly. However, after the first heating element 113 and the second heating element 114 reach the minimum Curie temperature, as the temperature further increases, the resistance of the first heating element 113 and the second heating element 114 continues to increase significantly. Therefore, the total power of the heating section 110 will differ from the sum of the rated power of each heating element, where the sum of the rated power of each heating element can be understood as the target power.

[0120] Based on this, to compensate for the difference between the total power of the heating unit 110 and the target power (i.e., the sum of the rated power of each heating element), it can be achieved by adding or removing the first heating element 113 and / or the second heating element 114. However, this configuration method results in discontinuous power compensation. For example, in the first embodiment described above, the first heating element 113 has a power of 120W at a working voltage of 220V and a power of 43W at a working voltage of 100V. If the first heating element 113 is added, the rated total power of the heating unit 110 can only be increased in stages of 120W / 43W. Therefore, it is difficult to achieve precise adjustment.

[0121] Based on this, the total power of the heating unit 110 can be adjusted by arranging at least one of the first heating element group 111, the second heating element group 112, and the third heating element group 115 in a position with a larger or smaller air volume, based on the flow difference within the housing 210.

[0122] When the heating element group (i.e., at least one of the first heating element group 111, the second heating element group 112, and the third heating element group 115) is in a position with a large airflow, the large airflow through the heating section 110 and the heat exchange section 120 per unit time allows more heat to be carried away. This lowers the temperature of the heating section 110 (and the heat exchange section 120), making it more difficult for it to reach the minimum Curie temperature; consequently, the resistance of the heating section 110 can be lower than the step resistance (also known as the high-resistance state resistance), allowing the heating section 110 to operate at a power level higher than its rated power. This increases the total power of the heating section 110.

[0123] Conversely, when the heating element group (i.e., at least one of the first heating element group 111, the second heating element group 112, and the third heating element group 115) is in a position with low airflow, the airflow through the heating section 110 and the heat exchange section 120 per unit time is small, thus carrying away less heat. This raises the temperature of the heating section 110 (and the heat exchange section 120), making it easier to reach the minimum Curie temperature; consequently, the resistance of the heating section 110 can reach a step resistance (also known as a high-resistance state), causing the heating section 110 to operate below its rated power. This reduces the total power of the heating section 110.

[0124] The following description uses a first rated voltage of 220V and a second rated voltage of 110V as an example. It should be noted that the first and second rated voltages are illustrative and can be any other voltage value.

[0125] For example, under the first rated voltage (i.e., 220V), the total power of the heating element 110 is 75W higher than expected. At this time, the first heating element 113 corresponds to a power of 120W at an airflow of 180m³ / h and 101W at an airflow of 100m³ / h; while the second heating element 114 corresponds to a power of 123W at an airflow of 180m³ / h and 105W at an airflow of 100m³ / h. The actual power of the first heating element 113 and the second heating element 114 under the aforementioned airflow conditions includes, but is not limited to, calculated values ​​and / or empirical values, which can be obtained by looking up tables.

[0126] Based on this, simply adjust any two first heating elements 113 and any two second heating elements 114 from the first position with an airflow of 180 m³ / h to the second position with an airflow of 100 m³ / h. At this time, the total power of the heating unit 110 decreases by 2 × (120-101) + 2 × (123-105) = 74 W, thus getting closer to the target power of each heating element.

[0127] Similarly, under the first rated voltage condition, the total power of the heating element 110 is 75W lower. At this time, the first heating element 113 has a power of 120W at an airflow of 180m³ / h and 101W at an airflow of 100m³ / h; while the second heating element 114 has a power of 123W at an airflow of 180m³ / h and 105W at an airflow of 100m³ / h.

[0128] Based on this, simply adjust any two first heating elements 113 and any two second heating elements 114 from the second position with an airflow of 100 m³ / h to the first position with an airflow of 180 m³ / h. At this time, the total power of the heating unit 110 increases by 2 × (120-101) + 2 × (123-105) = 74 W, thus getting closer to the target power of each heating element.

[0129] Therefore, when the total power of the heating unit 110 is greater than the target power, the heating element (i.e., the first heating element 113 and / or the second heating element 114) located at the first position with high unit air volume can be moved to the second position with low unit air volume. Of course, it is also possible to adjust this by adding more heating elements.

[0130] Furthermore, under the second rated voltage (i.e., 110V), the total power of the heating element 110 is 80W too high. At this time, the first heating element 113 corresponds to a power of 43W at an airflow of 180m³ / h, while the second heating element 114 corresponds to a power of 124W at the same airflow. Therefore, while maintaining the position of the heating elements, the total power of the heating element 110 can be adjusted by replacing the second heating element 114 with the first heating element 113. In this case, the total power of the heating element 110 decreases by 124-43=81W, thus bringing it closer to the target power of each heating element.

[0131] Similarly, under the second rated voltage (i.e., 110V), the total power of the heating element 110 is 80W lower than expected. At this time, the first heating element 113 corresponds to a power of 43W at an airflow of 180m³ / h, while the second heating element 114 corresponds to a power of 124W at the same airflow. Therefore, while maintaining the position of the heating elements, the total power of the heating element 110 can be adjusted by replacing the first heating element 113 with the second heating element 114. In this case, the total power of the heating element 110 increases by 124-43=81W, thus bringing it closer to the target power of each heating element.

[0132] Similarly, when the total power of the heating element 110 is lower than the target power, the total power of the heating element 110 can be made closer to the target power by replacing the first heating element 113 with the second heating element 114.

[0133] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the directions in the accompanying drawings and are not intended to limit the scope of protection of this utility model. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding this utility model.

[0134] The embodiments of this utility model have been described above. However, these embodiments are merely illustrative and not intended to limit the scope of this utility model. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. For example, in addition to the third heating group, a fourth and fifth heating group can be provided according to actual conditions. The scope of this utility model is defined by the appended claims and their equivalents. Without departing from the scope of this utility model, those skilled in the art can make various substitutions and modifications, all of which should fall within the scope of this utility model.

Claims

1. A heater comprising: A heating section and a heat exchange section, wherein the heating section generates heat, and the heat exchange section conducts heat to the heating section, and the heat exchange section exchanges heat between the heating section and air, characterized in that... The heating element includes a group of heating elements, at least a portion of which have a first step resistance, and at least another portion of which have a second step resistance. The first step resistor should be configured to be larger than the second step resistor.

2. The heater of claim 1, wherein The heating element group includes a first heating element group and a second heating element group, which are arranged side by side along a first direction.

3. The heater of claim 2, wherein, The first heating element group includes at least one first heating element, and the second heating element group includes at least one second heating element; The first heating element is adapted to a first rated voltage, the second heating element is adapted to a second rated voltage, and the first rated voltage is configured to be greater than the second rated voltage.

4. The heater of claim 3, wherein, The first heating element group has at least two first heating elements, which are arranged sequentially along a second direction, and the second direction forms an angle with the first direction.

5. The heater of claim 3, wherein The first heating element group also has at least one second heating element, which is arranged sequentially or alternately with the first heating element along a second direction, and the second direction forms an angle with the first direction.

6. The heater of claim 5, wherein, The first heating element group is equipped with different numbers of first heating elements and second heating elements; Alternatively, the first heating element group may be configured with the same number of first heating elements and second heating elements.

7. The heater of claim 3, wherein The second heating element group has at least two second heating elements, which are arranged sequentially along a second direction, and the second direction forms an angle with the first direction.

8. The heater of claim 3, wherein The second heating element group also has at least one of the first heating elements; The second heating element and the first heating element are arranged sequentially or alternately along the second direction, and the second direction forms an angle with the first direction.

9. The heater of claim 8, wherein, The second heating element group is configured with different numbers of the first heating element and the second heating element; Alternatively, the second heating element group may be configured with the same number of the first heating elements and the second heating elements.

10. The heater of any one of claims 2 to 9, wherein, The heating element group also includes at least one third heating element group; The third heating element group includes at least one of the first heating elements and / or at least one of the second heating elements.

11. The heater of claim 10, wherein, At least one of the first heating element group, the second heating element group, and the third heating element group further includes a dummy element; The dummy piece is arranged sequentially with the first heating piece and / or the second heating piece along the second direction, and the second direction forms an angle with the first direction.

12. The heater of claim 11, wherein, The sum of the number of heating elements and the number of dummy elements in at least two of the first heating element group, the second heating element group, and the third heating element group is configured to be the same.

13. The heater of claim 10, wherein, At least one of the first heating element group, the second heating element group, and the third heating element group further comprises a third heating element; The third heating element is arranged sequentially with the first heating element and / or the second heating element along the second direction, and the second direction forms an angle with the first direction. The third heating element has a third step resistor, which is different from the first step resistor and the second step resistor.

14. The heater of claim 1, wherein, The total power of the heating element is configured as the sum of the power of each heating element.

15. A ventilation device, characterized in that include: basket; An air inlet is provided in the housing to allow air to enter; An air outlet is provided on the basket body for supplying air out. An air supply unit, located inside the basket, is used to guide air from the air inlet to the air outlet; The heater as described in any one of claims 1 to 14, wherein the heater is located upstream of the air outlet and is used to heat the flowing air.

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