Test tool

Abstract

The utility model belongs to the technical field of hot water equipment, and particularly discloses a testing tool which comprises an exhaust fume collecting hood, a flue gas sampling tube and a flue gas sensor, the exhaust fume collecting hood is provided with a fume inlet facing the combustor, and the exhaust fume collecting hood is provided with a plurality of installation structures. The flue gas sampling pipe is provided with a sampling hole, and the flue gas sampling pipe can be mounted on any mounting structure and conduct flue gas to the flue gas sensor; and when the smoke sampling pipe traverses the mounting structure, the sampling hole can traverse all fire holes of the combustor. According to the testing tool, by changing the position of the flue gas sampling pipe in the exhaust fume collecting hood, the flue gas values of the flue gas discharged from the fire holes at different positions in the combustor can be detected respectively, so that whether primary air or secondary air distribution of the combustor is reasonable or not is judged; and the improvement on the structures of the primary air hole and the secondary air hole of the gas water heater is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of hot water equipment technology, and in particular to a testing fixture. Background Technology

[0002] Gas water heaters use gas as fuel. A burner ignites a mixture of gas and air in the combustion chamber, producing high-temperature flue gas. This flue gas then exchanges heat with cold water in a heat exchanger to produce hot water. In partially premixed burners, the gas and required air are pre-mixed; this air is called primary air. The mixture then flows out of the burner orifice. After ignition, some of the gas burns first against the primary air, forming the flame core, also known as the inner cone. The remaining gas mixes with the combustion products and diffuses and re-burns with the surrounding air; this mixed air is called secondary air, and the resulting flame is commonly called the outer cone.

[0003] The distribution of primary and secondary air determines whether the gas can burn completely. Therefore, in the research and development of gas water heaters, determining whether the distribution of primary and secondary air is reasonable has become a key research focus. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a testing fixture for determining whether the primary and secondary air distribution of the burner in a gas water heater is reasonable.

[0005] The above-mentioned technical problems are solved by the following technical solutions:

[0006] The test fixture includes a smoke hood, a flue gas sampling tube, and a flue gas sensor; the smoke hood has a smoke inlet facing the burner of the gas water heater, and the smoke hood is provided with multiple mounting structures; the flue gas sampling tube has sampling holes, and the flue gas sampling tube can be installed on any of the mounting structures and conduct flue gas to the flue gas sensor; when the flue gas sampling tube traverses all the mounting structures, the sampling holes can traverse all the burner holes.

[0007] Compared with the prior art, the testing fixture described in this utility model has the following advantages:

[0008] The testing fixture provided by this utility model, by adjusting the position of the flue gas sampling pipe, can detect the flue gas value emitted from the flame holes within a corresponding range when the flue gas sampling pipe is installed in a certain installation structure. Based on the flue gas value, the range of flame holes with abnormalities can be determined, which helps to analyze whether the primary and secondary air distribution is reasonable, and thus improve the structure of the primary and secondary air holes on the burner. Furthermore, the above-mentioned testing fixture can also be used in the burner manufacturing process of gas water heaters to perform quality inspection on the actual machining dimensions of the burner flame holes, and to determine whether the corresponding flame holes meet the machining requirements based on abnormal flue gas values.

[0009] In one embodiment, the test fixture further includes a first sealing member, and a plurality of the first sealing members are detachably sealed to a portion of the sampling port of the flue gas sampling tube.

[0010] In one embodiment, the burner includes multiple burner units, each burner unit having multiple flame holes. The smoke hood has the same number of mounting structures as the burner units. These mounting structures are spaced apart along a distribution direction parallel to the multiple burner units, and each mounting structure is aligned one-to-one with each burner unit. The flue gas sampling pipe has sampling holes spaced apart, the same number as the flame holes on the burner units. The distance between adjacent sampling holes on the flue gas sampling pipe is the same as the distance between adjacent flame holes on the burner units. Alternatively, the burner includes multiple burner units, with multiple flame holes opened on each burner unit. The smoke collection hood is provided with an installation structure having the same number of flame holes as any one of the burner units. The multiple installation structures are spaced apart along a distribution direction perpendicular to the multiple burner units, and each installation structure is aligned one-to-one with each flame hole of the burner unit. The flue gas sampling pipe is provided with sampling holes spaced apart, having the same number as the number of burner units. The distance between adjacent sampling holes is the same as the distance between flame holes in a straight line between adjacent burner units.

[0011] In one embodiment, the mounting structure includes a socket into which the flue gas sampling tube is inserted and removed; the testing fixture also includes a second sealing member, and a plurality of the second sealing members are detachably sealed in sockets other than the socket where the flue gas sampling tube is located.

[0012] In one embodiment, the first end of the flue gas sampling tube extends out of the smoke collection hood through the insertion hole and is open, and the flue gas sensor is located outside the smoke collection hood.

[0013] In one embodiment, the installation structure further includes a fixing head, the smoke collection hood includes a first wall panel and a second wall panel disposed opposite to each other, the insertion hole is opened on the first wall panel, the fixing head is disposed on the second wall panel, the fixing head corresponds one-to-one with each of the insertion holes and the fixing head has a slot on the side facing the insertion hole, the second end of the flue gas sampling tube is inserted into the slot, and / or the second end of the flue gas sampling tube is closed.

[0014] In one embodiment, the fixing head is adhered to the second wall panel.

[0015] In one embodiment, the second wall panel has a mounting hole, and the fixing head passes through the mounting hole.

[0016] In one embodiment, the fixing head includes a mounting part and a limiting part, the limiting part is axially connected to the mounting part, and the radius of the limiting part is larger than the radius of the mounting part. The slot is formed in the limiting part, and the mounting part is inserted into the mounting hole. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the test fixture for different installation structures when the flue gas sampling tube provided in this utility model is installed.

[0018] Figure 2 This is a partial cross-sectional view of the test fixture provided in the embodiments of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the smoke collection hood provided in the embodiments of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the flue gas sampling tube provided in the embodiments of this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the fixing head proposed in the embodiment of this utility model.

[0022] Label Explanation:

[0023] 1. Smoke hood; 11. Smoke inlet; 12. Smoke outlet; 13. Insertion hole; 14. Mounting hole; 15. First wall panel; 16. Second wall panel; 2. Flue gas sampling pipe; 21. Sampling hole; 3. Burner unit; 31. Flame hole; 4. Fixing head; 41. Mounting part; 42. Limiting part; 421. Slot. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] Whether the primary and secondary air distribution of a gas water heater burner is reasonable depends on the structure of the primary and secondary air holes, such as their distribution and size. When the primary or secondary air distribution is unreasonable, the burner is prone to producing carbon monoxide due to incomplete combustion. Therefore, by measuring the flue gas value discharged from each burner hole, it is possible to determine whether the primary or secondary air distribution of the burner is reasonable.

[0029] This embodiment proposes a testing fixture, including a smoke hood 1, a flue gas sampling tube 2, and a flue gas sensor. The smoke hood 1 has a smoke inlet 11 and a smoke outlet 12 on opposite sides. Multiple mounting structures are provided inside the smoke hood 1. The flue gas sampling tube 2 is detachably mounted on any mounting structure of the smoke hood 1 and transmits flue gas to the flue gas sensor (not shown in the figure). The flue gas sensor detects the flue gas value collected by the sampling tube 2. The sampling tube 2 has a sampling hole 21. When the sampling tube 2 traverses all mounting structures, the sampling hole 21 can traverse all the burner orifices 31. "The sampling hole 21 traverses all the burner orifices 31" means that the sampling hole 21 is aligned with all the burner orifices 31.

[0030] When using the above-mentioned testing fixture, the smoke inlet 11 of the smoke hood 1 should face the burner of the gas water heater, and the smoke hood 1 should be fixedly connected to the burner. When the flue gas sampling pipe 2 is installed on a certain mounting structure, it should be aligned with the flame holes 31 on the burner. This alignment continues until the flue gas sampling pipe 2 has traversed all mounting structures and all flame holes 31 of the burner. If the flue gas value collected by the flue gas sampling pipe 2 from the flame holes 31 is abnormal, it indicates that the design of the primary or secondary air holes is unreasonable. The location of the abnormal flame holes helps to deduce the unreasonable setting of the primary or secondary air holes. For example, the number of secondary or primary air holes near the abnormal flame holes on the burner may be too small, or the hole diameter may be too small. It is worth emphasizing that the above-mentioned testing fixture can also be applied to the burner manufacturing process of gas water heaters to inspect the actual machining dimensions of the burner's flame holes and determine whether the corresponding flame holes meet the machining requirements based on abnormal flue gas values.

[0031] Understandably, one or more flue gas sampling tubes 2 can be installed, with each flue gas sensor corresponding to a specific sampling tube 2 to improve flue gas detection efficiency. (Reference) Figure 4 As shown, the flue gas sampling pipe 2 has multiple sampling holes 21 spaced apart. When the flue gas sampling pipe 2 is installed in a certain mounting structure, the multiple sampling holes 21 are respectively opposite to multiple burner holes 31. At this time, if the flue gas sensor detects an abnormal flue gas value, it indicates that there is an abnormal burner hole among the multiple burner holes 31.

[0032] Based on this, if it is necessary to further narrow down the range of abnormal burner holes, the combustion water heater testing machine also includes a first sealing component (not shown in the figure). Multiple first sealing components can be detachably sealed to other sampling holes 21 except for the sampling hole 21 opposite to the target burner hole 31. This allows for the collection of flue gas values ​​only from the flue gas emitted from the target burner hole 31, thereby accurately identifying the abnormal burner hole 31. The first sealing component can be made of aluminum foil.

[0033] Specifically, the burner includes multiple burner units 3 with identical structures, arranged in parallel, and multiple flame holes 31 spaced apart along the length of each burner unit 3. Thus, the flame holes 31 on the burner are arranged in a rectangular array, such as... Figure 1 As shown, multiple burner units 3 are arranged along the width direction of the smoke collection hood 1. Figure 1 The burner units 3 are arranged in a front-to-back direction, and are respectively defined as row 1, row 2, ... from back to front. The flame holes 31 on the multiple burner units 3 are along the length of the smoke hood 1. Figure 1 The left and right directions are defined as 1 row of fire holes, 2 rows of fire holes, etc., respectively.

[0034] The smoke hood 1 is provided with the same number of installation structures as the burner unit 3. Multiple installation structures are arranged at intervals along the distribution direction parallel to the multiple burner units 3, and each installation structure is aligned with each burner unit 3. The flue gas sampling pipe 2 is provided with the same number of sampling holes 21 as the number of fire holes 31 on a single burner unit 3. The distance between adjacent sampling holes 21 on the flue gas sampling pipe 2 is the same as the distance between adjacent fire holes 31 on a single burner unit 3.

[0035] Alternatively, the smoke hood 1 may be provided with an installation structure having the same number of fire holes 31 as the burner unit 3. Multiple installation structures are spaced apart along a distribution direction perpendicular to the multiple burner units 3, and each installation structure is aligned with each fire hole 31 of the burner unit 3. The flue gas sampling pipe 2 is provided with sampling holes 21 having the same number as the burner unit 3 at intervals, and the distance between adjacent sampling holes 21 is the same as the distance between fire holes 31 in a straight line between adjacent burner units 3.

[0036] In actual processing, whether the installation structure is spaced apart along the distribution direction parallel to the multiple burner units 3 or spaced apart along the distribution direction perpendicular to the multiple burner units 3 can be adaptively selected based on the setting of other components of the test fixture, such as according to the distance between adjacent burner units 3 or the specific structure of the smoke hood 1.

[0037] In this embodiment, the mounting structure is spaced apart along the distribution direction perpendicular to the multiple burner units 3. Taking the detection of one row and one column of flame holes 31 as an example, the flue gas sampling pipe 2 is installed on the mounting structure corresponding to the one column of flame holes. Before installation, the sampling hole 21 opposite to the one row and one column of flame holes 31 is blocked, so that the abnormality of the one row and one column of flame holes 31 can be detected.

[0038] Table 1. Flue gas distribution of a group of burners tested using the test fixture.

[0039]

[0040] As shown in Table 1, the tested group of burners includes 6 burner units 3, each of which has 8 flame holes 31. The CO concentration in the flue gas discharged from the first flame hole of the 6th row of burner units is too high, indicating that there is an abnormality in the flame hole or the primary or secondary air hole near the flame hole.

[0041] Table 2 shows the flue gas distribution of another set of burners tested with the test fixture.

[0042]

[0043]

[0044] As shown in Table 2, the tested group of burners also included 6 burner units 3. Each burner unit 3 was provided with 8 flame holes 31. The CO concentration of the flue gas discharged from the first flame hole, the second flame hole of the second row of burner units, and the second flame hole of the third row of burner units was too high, indicating that there was an abnormality in the above flame holes or the primary or secondary air holes near the above flame holes.

[0045] To facilitate the installation and removal of the flue gas sampling tube 2, the installation structure includes a socket 13 into which the flue gas sampling tube 2 is inserted and removed. It should be noted that when testing the target flame hole 31, all sockets 13 except the one into which the flue gas sampling tube 2 is inserted must be sealed to prevent flue gas leakage. Of course, during normal use of the smoke hood 1, all sockets 13 are sealed. In addition, the testing fixture also includes a second sealing element (not shown in the figure) for sealing the sockets 13; the second sealing element can also be made of aluminum foil.

[0046] Specifically, in order to avoid the flue gas sensor being in the high-temperature environment inside the smoke collection hood 1 and to extend the service life of the flue gas sensor, the flue gas sensor is located outside the smoke collection hood 1, and the first end of the flue gas sampling tube 2 passes through the insertion hole 13 and is set open to conduct flue gas to the flue gas sensor.

[0047] refer to Figure 3 As shown, the smoke hood 1 includes a first wall panel 15 and a second wall panel 16 arranged opposite to each other. The insertion hole 13 is opened on the first wall panel 15. The installation structure also includes a fixing head 4, which corresponds to each insertion hole 13. The fixing head 4 is provided with a slot 421 for inserting the second end of the smoke sampling tube 2. In addition to fixing the smoke sampling tube 2, the fixing head 4 can also limit the depth of the smoke sampling tube 2 inserted into the smoke hood 1 so that the unblocked sampling hole 21 on the smoke sampling tube 2 is aligned with the target fire hole 31.

[0048] Specifically, the fixing head 4 is bonded to the second wall panel 16 with high-temperature sealant. In order to improve the connection stability between the fixing head 4 and the second wall panel 16, the second wall panel 16 is provided with a mounting hole 14, and the fixing head 4 passes through the mounting hole 14.

[0049] refer to Figure 5 As shown, the fixing head 4 includes a mounting portion 41 and a limiting portion 42. Both the limiting portion 42 and the mounting portion 41 are circular and axially connected. The radius of the mounting portion 41 is the same as the radius of the mounting hole 14, while the radius of the limiting portion 42 is larger than the radius of the mounting portion 41. A slot 421 is formed in the limiting portion 42. When the fixing head 4 is assembled onto the second wall panel 16, the mounting portion 41 is inserted into the mounting hole 14, and high-temperature sealant is applied to the end where the limiting portion 42 connects to the mounting portion 41.

[0050] In other embodiments, the mounting structure may also be a slot provided on the first wall panel 15 and the second wall panel 16, with the flue gas sampling pipe 2 being inserted into the slot.

[0051] To prevent flue gas from flowing out from the first end of the flue gas sampling tube 2 and affecting the detection results, the second end of the flue gas sampling tube 2 is sealed. The flue gas enters the flue gas sensor from the first end of the flue gas sampling tube 2 to realize the detection of the flue gas value.

[0052] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0053] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A testing fixture, characterized in that, The test fixture includes: A smoke hood (1) has a smoke inlet (11) facing the burner of a gas water heater, and the smoke hood (1) is provided with multiple mounting structures; A flue gas sampling tube (2) having a sampling hole (21) and capable of being installed on any of the aforementioned mounting structures; The flue gas sensor is connected to the flue gas sensor by the flue gas sampling tube (2); When the flue gas sampling pipe (2) traverses all of the mounting structures, the sampling hole (21) can traverse all the burner holes (31).

2. The test fixture according to claim 1, characterized in that, The test fixture also includes a first sealing element, and a plurality of the first sealing elements are detachably sealed to a portion of the sampling port (21) of the flue gas sampling tube (2).

3. The testing fixture according to claim 1, characterized in that, The burner includes multiple burner units (3), each burner unit (3) is provided with multiple fire holes (31), the smoke hood (1) is provided with the same number of mounting structures as the burner units (3), the multiple mounting structures are spaced apart along the distribution direction parallel to the multiple burner units (3), and each mounting structure is aligned with each burner unit (3) one to one, the flue gas sampling pipe (2) is provided with the same number of sampling holes (21) as the fire holes (31) on the burner unit (3), and the distance between adjacent sampling holes (21) on the flue gas sampling pipe (2) is the same as the distance between adjacent fire holes (31) on a single burner unit (3); Alternatively, the burner includes multiple burner units (3), with multiple fire holes (31) opened on each burner unit (3). The smoke hood (1) is provided with an installation structure having the same number of fire holes (31) as any of the burner units (3). The multiple installation structures are spaced apart along a distribution direction perpendicular to the multiple burner units (3), and each installation structure is aligned with each fire hole (31) of the burner unit (3). The flue gas sampling pipe (2) is provided with sampling holes (21) spaced apart, having the same number as the number of the burner units (3). The distance between adjacent sampling holes (21) is the same as the distance between fire holes (31) on the same straight line between adjacent burner units (3).

4. The testing fixture according to any one of claims 1-3, characterized in that, The mounting structure includes a socket (13), into which the flue gas sampling tube (2) is inserted and installed; the testing fixture also includes a second sealing member, and a plurality of the second sealing members are detachably sealed in sockets (13) other than the socket (13) where the flue gas sampling tube (2) is located.

5. The testing fixture according to claim 4, characterized in that, The first end of the flue gas sampling tube (2) extends out of the smoke collection hood (1) through the insertion hole (13) and is set open. The flue gas sensor is set outside the smoke collection hood (1).

6. The testing fixture according to claim 4, characterized in that, The installation structure also includes a fixing head (4). The smoke hood (1) includes a first wall panel (15) and a second wall panel (16) arranged opposite to each other. The insertion hole (13) is opened on the first wall panel (15). The fixing head (4) is arranged on the second wall panel (16). The fixing head (4) corresponds one-to-one with each of the insertion holes (13) and the fixing head (4) has a slot (421) on the side facing the insertion hole (13). The second end of the flue gas sampling tube (2) is inserted into the slot (421); and / or, the second end of the flue gas sampling tube (2) is closed.

7. The test fixture according to claim 6, characterized in that, The fixing head (4) is bonded to the second wall panel (16).

8. The test fixture according to claim 6, characterized in that, The second wall panel (16) has an installation hole (14) and the fixing head (4) passes through the installation hole (14).

9. The test fixture according to claim 8, characterized in that, The fixing head (4) includes a mounting part (41) and a limiting part (42). The limiting part (42) is axially connected to the mounting part (41), and the radius of the limiting part (42) is greater than the radius of the mounting part (41). The slot (421) is opened in the limiting part (42), and the mounting part (41) is inserted into the mounting hole (14).

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