Heater efficiency testing device

Abstract

The utility model relates to the technical field of heater testing, in particular to a heater efficiency testing device which comprises a fan, a dust removal unit, an installation unit and a first detection unit, the dust removal unit comprises a first air duct pipe and a filtering structure, the filtering structure is arranged in the first air duct pipe, and the output end of the fan is communicated with one end of the first air duct pipe; the mounting unit is provided with a mounting cavity used for mounting a heater and allowing airflow to flow through, and the front end of the mounting unit communicates with the other end of the first air duct pipe; the first detection unit is communicated with the rear end of the installation unit, a first detection space for airflow to flow through is formed in the first detection unit, and a first temperature detection element and a first flow detection element are arranged in the first detection space. After air is input into the first air duct pipe through the fan, the filtering structure can filter dust in the air, the quantity of the dust entering the mounting unit is reduced, heat transferred to the dust by the heater is reduced, and the efficiency detection precision of the heater is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heater testing, in particular to a heater efficiency testing device. Background Art

[0002] Positive Temperature Coefficient (PTC) thermistor is a typical semiconductor resistor with temperature sensitivity. When the PTC thermistor is heated, its resistance value increases stepwise with the increase of temperature. When the PTC thermistor exceeds a certain temperature, the resistance value enters the transition zone and its surface temperature remains constant. The PTC heater that achieves the heating effect based on the constant temperature heating characteristics of the PTC thermistor has the characteristics of compact structure, no environmental pollution, high safety, high thermal efficiency and long service life, and is widely used in computers, communication equipment, battery packs, electric vehicles and other fields.

[0003] During the heating process of the PTC heater, due to the influence of the manufacturing process and materials used, there is a deviation between the actual heating efficiency and the theoretical efficiency, so it is necessary to test the actual heating efficiency of the PTC heater. The PTC heater heating test device currently used is easily affected by dust in the air during use, resulting in large measurement errors. Utility Model Content

[0004] The utility model aims to provide a heater efficiency testing device, which can reduce the influence of dust on the test result when testing the heating efficiency of the heater and improve the accuracy of the heater heating efficiency test.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A heater efficiency testing device comprises: a fan, a dust removal unit, a mounting unit, and a first detection unit; the dust removal unit comprises a first air duct pipe and a filter structure, the filter structure is arranged in the first air duct pipe, and the output end of the fan is connected to one end of the first air duct pipe; the mounting unit is provided with an installation cavity for mounting a heater and for airflow to flow through, and the front end of the mounting unit is connected to the other end of the first air duct pipe; the first detection unit is connected to the rear end of the mounting unit, and the first detection unit forms a first detection space for airflow to flow through, and a first temperature detection element and a first flow detection element are arranged in the first detection space.

[0007] Preferably, the heater efficiency testing device also includes a second detection unit, which is connected between the dust removal unit and the installation unit, and the second detection unit forms a second detection space for airflow to flow through, and a second temperature detection element and a second flow detection element are arranged in the second detection space.

[0008] Preferably, the dust removal unit comprises multiple layers of the filter structure, and the multiple layers of the filter structure are arranged in the first air duct at intervals along the air flow direction.

[0009] Preferably, the size of the filter units of each layer of the filter structure gradually decreases along the airflow direction.

[0010] Preferably, the heater efficiency testing device also includes an adjustment tube, the cross-sectional area of ​​the inlet of the adjustment tube is smaller than the cross-sectional area of ​​the outlet, the inlet end of the adjustment tube is connected to the output end of the fan, and the outlet end of the adjustment tube is connected to one end of the first air duct tube.

[0011] Preferably, the heater efficiency testing device also includes a rectification unit, which includes a second air duct pipe and a rectification structure, the second air duct pipe is connected between the first air duct pipe and the installation unit, the rectification structure is arranged in the second air duct pipe, and the rectification structure divides the space in the second air duct pipe to form a plurality of passages along the airflow direction.

[0012] Preferably, a plurality of the rectifying structures are arranged in the second air duct, and the plurality of the rectifying structures are arranged at intervals along the airflow direction. The plurality of passages included in each of the rectifying structures are arranged in parallel, and the passages formed by different rectifying structures are arranged at an angle.

[0013] Preferably, the heater efficiency testing device also includes a first exhaust duct, which is connected between the dust removal unit and the installation unit; and / or, the heater efficiency testing device also includes a second exhaust duct, which is connected between the installation unit and the detection unit; and / or, the heater efficiency testing device also includes a third exhaust duct, which is connected to the end of the detection unit.

[0014] Preferably, the heater efficiency testing device includes a first base, which is arranged at the bottom of the fan; and / or, the heater efficiency testing device also includes a second base, which is arranged at the bottom of the dust removal unit; and / or, the heater efficiency testing device also includes a third base, which is arranged at the bottom of the first detection unit.

[0015] Preferably, the heater efficiency testing device also includes a first thermal insulation layer, which is coated on the dust removal unit; and / or, the heater efficiency testing device also includes a second thermal insulation layer, which is coated on the mounting unit; and / or, the heater efficiency testing device also includes a third thermal insulation layer, which is coated on the first detection unit.

[0016] Beneficial effects of the utility model:

[0017] The utility model proposes a heater efficiency test device, which includes a fan, a dust removal unit, a mounting unit and a first detection unit. The output end of the fan is connected to the dust removal unit, the mounting unit and the first detection unit in sequence, and the fan can convey air; the dust removal unit can filter dust in the air to prevent dust from entering the mounting unit; the mounting cavity of the mounting unit is used to install the heater to be tested and to heat and circulate air; the first detection unit is provided with a first temperature detection element and a first flow detection element, which are respectively used to detect the temperature and flow of the heated air. After the air output by the fan passes through the dust removal unit, it is heated by the heater, and the temperature change and flow of the air are measured by the first temperature detection element and the first flow detection element respectively, and the energy transferred to the air by the heater is calculated and compared with the input energy of the heater, so as to detect the heating efficiency of the heater, reduce the influence of dust on the heater efficiency detection, and improve the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a heater efficiency testing device provided by the utility model;

[0019] Figure 2 It is a schematic diagram of a dust removal unit of a heater efficiency testing device provided by the utility model;

[0020] Figure 3 It is a schematic diagram of a first detection unit of a heater efficiency test device provided by the utility model;

[0021] Figure 4 It is a schematic diagram of a rectifier unit of a heater efficiency testing device provided by the utility model.

[0022] In the figure:

[0023] 1. Fan;

[0024] 2. dust removal unit; 21. first air duct; 22. filtering structure;

[0025] 3. Installation unit;

[0026] 4. First detection unit; 41. First detection space; 42. Third air duct; 421. Through hole; 43. Observation structure; 431. First part; 432. Second part; 433. Observation hole; 44. Protective plate;

[0027] 5. The second detection unit; 6. The adjustment tube;

[0028] 7. Rectification unit; 71. Second air duct; 72. Rectification structure; 721. Passage; 722. Rectification plate;

[0029] 8. Exhaust duct; 81. First exhaust duct; 82. Second exhaust duct; 83. Third exhaust duct;

[0030] 9. base; 91. first base; 92. second base; 93. third base; 94. fourth base; 100. electric heater. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions 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 cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figure 1As shown, the utility model proposes a heater efficiency test device, which includes a fan 1, a dust removal unit 2, a mounting unit 3 and a first detection unit 4. The dust removal unit 2 includes a first air duct pipe 21 and a filter structure 22, the filter structure 22 is arranged in the first air duct pipe 21, the output end of the fan 1 is connected to one end of the first air duct pipe 21, and the fan 1 is used to transport air into the first air duct pipe 21. The mounting unit 3 is provided with a mounting cavity for mounting a heater and for airflow to flow through, and the front end of the mounting unit 3 is connected to the other end of the first air duct pipe 21. The first detection unit 4 is connected to the rear end of the mounting unit 3, and the first detection unit 4 forms a first detection space 41 for airflow to flow through, and a first temperature detection element and a first flow detection element are arranged in the first detection space 41. In this embodiment, the first temperature detection element is a thermocouple sensor, and the first flow detection element is an air flow sensor.

[0035] When using the heater efficiency test device provided by the utility model, air is output by the fan 1, and the output air passes through the dust removal unit 2, the installation unit 3 and the first detection unit 4 in sequence. After the air enters the first air duct 21, the filter structure 22 can filter the dust in the air and reduce the amount of dust entering the installation unit 3 with the air. When the air enters the installation unit 3, the heater transfers heat to the air to heat the air. After the air is heated, the air flows into the first detection unit 4. The temperature and flow of the air are measured by the first temperature detection element and the first flow detection element respectively. The temperature of the air measured after turning on the heater is compared with the ambient temperature before turning on the heater to obtain the temperature change of the air. The output energy of the heater is calculated by combining the air flow through the heater obtained by measurement, and compared with the input energy of the heater to obtain the efficiency of the heater. Using the heater efficiency test device, the amount of dust in contact with the heater can be reduced, the heat transferred from the heater to the dust can be reduced, and the accuracy of the heater efficiency detection can be improved.

[0036] like Figure 2 As shown, in order to improve the filtering accuracy of the dust removal unit 2, a multi-layer filtering structure 22 is provided in the dust removal unit 2, and the multi-layer filtering structure 22 is arranged in the first air duct 21 at intervals along the airflow direction to achieve multi-layer filtering of the air. Preferably, the size of the filtering unit of each layer of the filtering structure 22 is gradually reduced along the airflow direction, so that smaller dust can be isolated from the heater step by step, further improving the measurement accuracy. In some embodiments, a filter net is used as the filtering structure 22, and in some other embodiments, the filtering structure 22 can also be set as filter cotton or the like.

[0037] Further, an electric heater 100 is provided outside the installation unit 3, and the electric heater 100 is electrically connected to the heater in the installation unit 3, and the electric heater 100 is used to heat the heater. Specifically, a high temperature resistant sealing ring is provided at the connection between the heater and the installation unit 3, which can prevent air leakage and reduce heat loss. Preferably, the installation unit 3 can be selected according to heaters of different sizes and models to expand the scope of application of the heater efficiency measuring device. In some embodiments, the heater is a PTC heater, and in some other embodiments, the heater can also be a flange heater, a pipe heater or other types of heaters.

[0038] like Figure 3 As shown, the first detection unit 4 also includes a third air duct pipe 42 for forming a first detection space 41, and a through hole 421 is provided on the third air duct pipe 42, and the first detection unit 4 also includes an observation structure 43 covering the through hole 421, and the observation structure 43 includes a first part 431 covering the through hole 421 and a second part 432 arranged at an angle to the first part 431, and an observation hole 433 is provided on the first part 431, through which the conditions of the first temperature detection element and the first flow detection element in the first detection space 41 can be observed. As a specific embodiment, the third air duct pipe 42 is a square barrel structure, and the third air duct pipe 42 is provided with four through holes 421, and the four through holes 421 are respectively arranged on the four wall surfaces of the third air duct pipe 42, one of the four through holes 421 is covered by the observation structure 43, and the remaining three through holes 421 are covered by a protective plate 44, and the protective plate 44 is connected to the outer wall of the third air duct pipe 42. In some embodiments, the observation structure 43 and the protection plate 44 are both connected to the outer wall of the third air duct 42 through a first connecting member circumferentially arranged in the through hole 421, and the first connecting member may include a first bolt and a first nut.

[0039] Furthermore, the heater efficiency test device further includes an adjustment tube 6, the cross-sectional area of ​​the inlet of the adjustment tube 6 is smaller than the cross-sectional area of ​​the outlet, the inlet end of the adjustment tube 6 is connected to the output end of the fan 1, and the outlet end of the adjustment tube 6 is connected to one end of the first air duct tube 21. Generally, the cross-sectional area of ​​the output end of the fan 1 is smaller than the cross-sectional area of ​​the dust removal unit 2, and cannot be directly matched and connected, so it is necessary to set the adjustment tube 6, the inlet end of the adjustment tube 6 can match the output end of the fan 1, and the outlet end of the adjustment tube 6 matches the cross-sectional area of ​​the dust removal unit 2, so the output end of the fan 1 can be connected to the dust removal unit 2 through the adjustment tube 6. In this embodiment, the adjustment tube 6 is a special-shaped rubber tube, the cross-sectional area of ​​the inlet of the adjustment tube 6 is circular, and the cross-sectional area of ​​the outlet of the adjustment tube 6 is square.

[0040] Further, refer to Figure 1 and Figure 4The heater efficiency test device further includes a rectifying unit 7, which includes a second air duct 71 and a rectifying structure 72. The second air duct 71 is connected between the dust removal unit 2 and the mounting unit 3. The rectifying structure 72 is arranged in the second air duct 71. The rectifying structure 72 divides the space in the second air duct 71 into a plurality of passages 721 along the air flow direction, so that the air is more evenly distributed in the second air duct 71, thereby reducing the adverse effects of the unevenness of the air on the test results. In this embodiment, the rectifying structure 72 includes a plurality of rectifying plates 722, which are arranged at intervals perpendicular to the air flow direction.

[0041] Preferably, continue to refer to Figure 4 , a plurality of rectifying structures 72 are arranged in the second air duct 71, and the plurality of rectifying structures 72 are arranged at intervals along the airflow direction, and a plurality of passages 721 included in each rectifying structure 72 are arranged in parallel, and the passages 721 formed by different rectifying structures 72 are arranged at an angle, so that the rectified air can be evenly diverted in different directions. In this embodiment, two rectifying structures 72 are arranged in the second air duct 71, and the rectifying plates 722 in the two rectifying structures 72 are perpendicular to each other, so that the passages 721 formed by the two rectifying structures 72 are perpendicular to each other. In some other embodiments, more rectifying structures 72 may be arranged in the second air duct 71, and the passages 721 formed by different rectifying structures 72 may also be arranged at 45°, 60° or other angles.

[0042] As a preferred embodiment, the heater efficiency test device can also be provided with a second detection unit 5, the second detection unit 5 is connected between the dust removal unit 2 and the installation unit 3, the second detection unit 5 forms a second detection space for airflow to flow through, and a second temperature detection element and a second flow detection element are arranged in the second detection space. The second detection unit 5 has the same structure as the first detection unit 4, and will not be described in detail here. The first detection unit 4 and the second detection unit 5 can compare the temperature change of the air within a certain range before and after the heater and the change of the air flow through the heater, thereby further reducing the measurement error.

[0043] Furthermore, the heater efficiency test device may also be provided with an exhaust duct 8, through which the spacing distances between the above-mentioned functional units are adjusted, and the installation positions of the various components are adaptively adjusted according to the installation environment. Optionally, the exhaust duct 8 may include a first exhaust duct 81, which is connected between the dust removal unit 2 and the installation unit 3; the exhaust duct 8 may also include a second exhaust duct 82, which is connected between the installation unit 3 and the detection unit 4; the exhaust duct 8 may also include a third exhaust duct 83, which is connected to the end of the detection unit 4. Of course, the number and position of the exhaust ducts 8 in the heater efficiency test device can be adaptively adjusted.

[0044] Further, the heater efficiency test device further includes a base 9, and optionally, the base 9 may include a first base 91, which is connected to the bottom of the fan 1 and is used to limit the vibration of the fan 1; the base 9 may also include a second base 92, which is arranged at the bottom of the dust removal unit 2 and is used to fix the dust removal unit 2; the base 9 may also include a third base 93, which is arranged at the bottom of the first detection unit 4. The base 9 may also be arranged at the bottom of the exhaust pipe 8, etc., and multiple bases 9 may also be arranged simultaneously in the heater efficiency test device.

[0045] Furthermore, the heater efficiency test device further includes an insulation layer, and optionally, the insulation layer may include a first insulation layer, the first insulation layer is coated on the dust removal unit 2; the insulation layer may also include a second insulation layer, the second insulation layer is coated on the installation unit 3; the insulation layer may also include a third insulation layer, the third insulation layer is coated on the first detection unit 4. Of course, the heater efficiency test device may wrap the outer walls of the second detection unit 5, the adjustment tube 6, the rectification unit 7, and the exhaust pipe 8 with insulation layers to reduce heat loss in the pipeline.

[0046] Continue to refer to Figure 1 As a specific implementation, the heater efficiency detection device sequentially connects the fan 1, the adjustment tube 6, the dust removal unit 2, the first exhaust duct 81, the rectifier unit 7, the second detection unit 5, the installation unit 3, the second exhaust duct 82, the first detection unit 4, and the third exhaust duct 83 along the first direction, and the dust removal unit 2, the first exhaust duct 81, the rectifier unit 7, the first detection unit 4, the installation unit 3, the second exhaust duct 82, the second detection unit 5, and the third exhaust duct 83 are all square structures. The above-mentioned components are connected by a second connecting member arranged circumferentially around the first direction. In some embodiments, the second connecting member can be a bolt and nut connection. Of course, in some other embodiments, it can also be connected in the form of buckle connection. A first base 91 is set at the bottom of the fan 1. The first base 91 is connected to the fan 1 by a third connecting member, and the bottom of the first base 91 is fixed on the workbench. A second base 92 is set at both ends of the dust removal unit 2, a third base 93 is set between the rectification unit 7 and the second detection unit 5, and a fourth base 94 is set at the end of the third exhaust port 83. The second base 92, the third base 93 and the fourth base 94 can be connected to the bottom of other components through a fourth connecting member, and can also be set between other components and connected by a second connecting member.

[0047] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A heater efficiency testing device, characterized in that: include: Fan (1); A dust removal unit (2), the dust removal unit (2) comprising a first air duct pipe (21) and a filtering structure (22), the filtering structure (22) being arranged in the first air duct pipe (21), and the output end of the fan (1) being connected to one end of the first air duct pipe (21); An installation unit (3), the installation unit (3) being provided with an installation cavity for installing a heater and for allowing airflow to flow through, and a front end of the installation unit (3) being connected to the other end of the first air duct tube (21); A first detection unit (4), the first detection unit (4) is connected to the rear end of the mounting unit (3), the first detection unit (4) forms a first detection space (41) for air flow to flow through, and a first temperature detection element and a first flow detection element are arranged in the first detection space (41).

2. The heater efficiency testing device according to claim 1, characterized in that: The heater efficiency testing device further comprises a second detection unit (5), wherein the second detection unit (5) is connected between the dust removal unit (2) and the mounting unit (3), and the second detection unit (5) forms a second detection space for airflow to flow through, and a second temperature detection element and a second flow detection element are arranged in the second detection space.

3. The heater efficiency testing device according to claim 1, characterized in that: The dust removal unit (2) comprises multiple layers of the filter structure (22), and the multiple layers of the filter structure (22) are arranged in the first air duct (21) at intervals along the air flow direction.

4. The heater efficiency testing device according to claim 3, characterized in that: The size of the filter unit of each layer of the filter structure (22) gradually decreases along the airflow direction.

5. The heater efficiency testing device according to claim 1, characterized in that: The heater efficiency testing device further comprises an adjustment tube (6), the cross-sectional area of ​​the inlet of the adjustment tube (6) being smaller than the cross-sectional area of ​​the outlet, the inlet end of the adjustment tube (6) being connected to the output end of the fan (1), and the outlet end of the adjustment tube (6) being connected to one end of the first air duct tube (21).

6. The heater efficiency testing device according to claim 1, characterized in that: The heater efficiency testing device also includes a rectification unit (7), the rectification unit (7) including a second air duct pipe (71) and a rectification structure (72), the second air duct pipe (71) being connected between the first air duct pipe (21) and the mounting unit (3), the rectification structure (72) being arranged in the second air duct pipe (71), and the rectification structure (72) dividing the space in the second air duct pipe (71) into a plurality of passages (721) along the air flow direction.

7. The heater efficiency testing device according to claim 6, characterized in that: A plurality of the rectifying structures (72) are arranged in the second air duct (71); the plurality of rectifying structures (72) are arranged at intervals along the airflow direction; the plurality of passages (721) included in each rectifying structure (72) are arranged in parallel; and the passages (721) formed by different rectifying structures (72) are arranged at an angle.

8. The heater efficiency testing device according to claim 1, characterized in that: The heater efficiency testing device further comprises a first exhaust duct (81), wherein the first exhaust duct (81) is connected between the dust removal unit (2) and the mounting unit (3); And / or, the heater efficiency testing device further comprises a second exhaust duct (82), wherein the second exhaust duct (82) is connected between the mounting unit (3) and the detection unit (4); And / or, the heater efficiency testing device further comprises a third exhaust duct (83), wherein the third exhaust duct (83) is connected to the end of the detection unit (4).

9. The heater efficiency testing device according to claim 1, characterized in that: The heater efficiency testing device comprises a first base (91), wherein the first base (91) is arranged at the bottom of the fan (1); And / or, the heater efficiency testing device further comprises a second base (92), wherein the second base (92) is arranged at the bottom of the dust removal unit (2); And / or, the heater efficiency testing device further comprises a third base (93), and the third base (93) is arranged at the bottom of the first detection unit (4).

10. The heater efficiency testing device according to claim 1, characterized in that: The heater efficiency testing device further comprises a first thermal insulation layer, wherein the first thermal insulation layer is coated on the dust removal unit (2); And / or, the heater efficiency testing device further comprises a second thermal insulation layer, wherein the second thermal insulation layer is coated on the mounting unit (3); And / or, the heater efficiency testing device further comprises a third thermal insulation layer, wherein the third thermal insulation layer covers the first detection unit (4).

Images