Structure for fixing thermistor of catalytic combustion type industrial alarm

Abstract

The utility model discloses a thermistor fixing structure of a catalytic combustion type industrial alarm, comprising a sensor part which comprises a sensor fixing bottom shell and a fixing upper cover, and a first cavity is formed between the sensor fixing bottom shell and the fixing upper cover; the socket fixing cover is clamped above the sensor fixing bottom shell and is provided with a first through hole, and the sensor fixing bottom shell is provided with a second through hole corresponding to the first through hole; the probe bottom shell is sleeved on the socket fixing cover, the probe upper cover is sleeved outside the sensor fixing bottom shell and the fixing upper cover, the bottom of the probe bottom shell, the first through hole and the sensor fixing bottom shell form a second cavity, and the head of the thermistor is arranged in the second cavity and abuts against the inner wall of the probe shell. And the tail part of the thermistor is supported by the supporting piece so as to ensure that the thermistor is attached to the inner wall of the probe bottom shell and isolate the first chamber from the second chamber. The thermistor is effectively isolated from the first cavity where the sensor circuit board is located, so that the influence of the temperature of the sensor on the thermistor is reduced to the minimum, and the measurement precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of combustible gas detectors, in particular to a structure for fixing a thermistor of a catalytic combustion type industrial alarm. Background Art

[0002] In the industrial production process, catalytic combustion industrial alarms, as a combustible gas alarm, are increasingly used in industrial environments where combustible gases exist to conduct real-time monitoring and alarm of combustible gas concentrations in the industrial environment.

[0003] Existing catalytic combustion type industrial alarms usually include two types. One is a thermistor-free design. This type of alarm usually cannot perform real-time temperature compensation due to the lack of a thermistor, resulting in poor monitoring accuracy. The other type has a thermistor design, but in this type of alarm, the thermistor is often welded on the main control circuit board of the alarm. After temperature compensation, the main control circuit board transmits the signal to the probe circuit board through a wiring harness. When the sensor probe needs to be replaced, it is usually necessary to disassemble the alarm cover and remove the wires connected to the main control circuit board. Since the thermistor is welded on the main control circuit board, the thermistor cannot be replaced when the sensor probe is replaced. As a result, there is a difference between the temperature monitored by the thermistor and the actual gas temperature, resulting in inaccurate compensation. At the same time, in this type of alarm, the thermistor often does not have an independent chamber, and there is an impact of sensor temperature changes on the thermistor, resulting in a final decrease in accuracy. Therefore, there is an urgent need for a structure for fixing the thermistor of a catalytic combustion type industrial alarm. Utility Model Content

[0004] Aiming at the deficiencies existing in the prior art, the utility model provides a structure for fixing the thermistor of a catalytic combustion type industrial alarm.

[0005] The utility model discloses a structure for fixing thermistor of a catalytic combustion type industrial alarm, comprising a probe, wherein the probe comprises a probe shell, a socket part and a sensor part arranged inside the probe shell;

[0006] The sensor part comprises a sensor fixing bottom shell and a sensor fixing upper cover which are clamped together, and a first chamber for installing the sensor circuit board is formed between the sensor fixing bottom shell and the sensor fixing upper cover;

[0007] The socket portion comprises a socket fixing cover, the socket fixing cover is clamped on the top of the sensor fixing bottom shell, the socket fixing cover is provided with a first through hole, and the sensor fixing bottom shell is provided with a second through hole corresponding to the first through hole;

[0008] The probe housing includes a probe bottom shell and a probe upper cover which are clamped together. The probe bottom shell is sleeved on the socket fixing cover, and the probe upper cover is sleeved on the outer sides of the sensor fixing bottom shell and the sensor fixing upper cover. The bottom of the probe bottom shell, the first through hole and the upper surface of the sensor fixing bottom shell together constitute a second chamber for placing a thermistor. The head of the thermistor is placed in the second chamber and abuts against the bottom inner wall of the probe bottom shell. The pin end of the thermistor passes through the second through hole and is electrically connected to the sensor circuit board. The tail of the thermistor is supported by a support member, and the support member is used to ensure that the thermistor fits the inner wall of the probe bottom shell. The support member and the sensor fixing bottom shell are used to isolate the first chamber from the second chamber.

[0009] As a further improvement of the utility model, the socket part also includes a socket circuit board, and the socket circuit board is fixedly mounted on the socket fixing cover by bolts. The socket fixing cover is provided with an internal thread fixing column for mounting the socket circuit board.

[0010] As a further improvement of the utility model, one end of the top of the socket fixing cover is vertically raised upward to form a convex mounting portion, the bottom of the probe bottom shell is provided with a concave mounting portion for accommodating the convex mounting portion, and the convex mounting portion of the socket fixing cover is placed in the concave mounting portion;

[0011] The center of the convex mounting portion is provided with the first through hole penetrating downward in the vertical direction, and the bottom of the probe bottom shell, the first through hole and the upper surface of the sensor fixing bottom shell together constitute the second chamber for placing the thermistor head.

[0012] As a further improvement of the utility model, the support member includes a top block for thermistor and a spring for thermistor;

[0013] The top block for thermistor is adapted to the inner diameter of the first through hole, a center hole is provided at the center of the top block for thermistor for the pin of the thermistor to pass through, the bottom of the top block for thermistor is recessed inward to form an inner concave portion for placing the spring for the thermistor, and the inner concave portion is connected to the center hole, and the pin end of the thermistor passes through the center hole and the second through hole and is electrically connected to the sensor circuit board;

[0014] The thermistor spring is sleeved on the outside of the thermistor pin, and the upper end of the thermistor spring is placed in the inner concave portion, and the lower end of the thermistor spring is against the upper surface of the sensor fixing bottom shell.

[0015] As a further improvement of the utility model, the support member includes a top block for thermistor and a sponge for thermistor;

[0016] The top block for thermistor is placed at the tail of the thermistor, the sponge for thermistor is placed below the pad for thermistor and on the upper surface of the sensor fixed bottom shell, the top block for thermistor and the sponge for thermistor are both provided with a center hole for the pin end of the thermistor to pass through at the center, and the pin end of the thermistor passes through the center hole and the second through hole in sequence and then is electrically connected to the sensor circuit board;

[0017] The outer diameter of the thermistor sponge is matched with the inner diameter of the first through hole.

[0018] As a further improvement of the utility model, the support member includes a top block for thermistor, a spring for thermistor and a sheath for thermistor;

[0019] The sensor fixing bottom shell protrudes upwards corresponding to the position of the first through hole to form a first convex portion, the first convex portion is provided with the second through hole at the position corresponding to the first through hole, the first convex portion is sleeved inside the first through hole, and the outer side of the first convex portion is sleeved with the thermistor sheath;

[0020] The top block for thermistor is placed at the tail of the thermistor, and the bottom center of the top block for thermistor is convex downward to form a second convex portion, the thermistor spring is sleeved outside the second convex portion, and the bottom of the thermistor spring is against the upper surface of the first convex portion, and the top block for thermistor and the center of its second convex portion are both provided with a center hole for the pin end of the thermistor to pass through;

[0021] The outer diameters of the thermistor top block and the thermistor spring are matched with the inner diameter of the first through hole.

[0022] As a further improvement of the utility model, the support member includes a top block for thermistor, a spring for thermistor and a FEP transparent tube;

[0023] The top block for thermistor is placed at the tail of the thermistor, the FEP transparent tube is sleeved on the outside of the pin end of the thermistor, and the upper end of the FEP transparent tube is against the bottom of the top block for thermistor, and the lower end of the FEP transparent tube passes through the second through hole and then against the sensor circuit board, and the outer diameter of the FEP transparent tube is adapted to the inner diameter of the second through hole;

[0024] The thermistor spring is sleeved on the FEP transparent tube between the thermistor top block and the upper surface of the sensor fixing bottom shell.

[0025] As a further improvement of the utility model, the support member includes a FEP transparent tube;

[0026] The sensor fixing bottom shell protrudes upwards corresponding to the position of the first through hole to form a first convex portion, and the first convex portion is sleeved in the first through hole, and the center of the first convex portion is provided with the second through hole penetrating downwards;

[0027] The thermistor is placed in the second through hole in the first convex portion, the head of the thermistor is against the bottom inner wall of the probe bottom shell, the tail of the thermistor is sleeved with the FEP transparent tube, and the FEP transparent tube is sleeved on the outer side of the pin end of the thermistor in the vertical direction and passes through the second through hole;

[0028] The outer diameter of the FEP transparent tube is matched with the inner diameter of the second through hole.

[0029] As a further improvement of the present invention, the sensor fixing bottom shell protrudes upward corresponding to the position of the first through hole to form a first convex portion, and the first convex portion is sleeved in the first through hole;

[0030] The center of the first convex portion is provided with the second through hole in a vertical direction downward, the thermistor is placed in the second through hole of the first convex portion, and the pin end of the thermistor passes through the second through hole and is electrically connected to the sensor circuit board;

[0031] The inner wall of the second through hole at one end close to the thermistor protrudes inward to form the support member matched with the tail of the thermistor, and the head of the thermistor is supported by the support member to fit with the bottom inner wall of the probe bottom shell.

[0032] As a further improvement of the utility model, the bottom of the sensor fixing bottom shell is surrounded by a plurality of buckles, and the upper inner side of the sensor fixing cover is surrounded by a plurality of slots matching with the buckles;

[0033] The sensor circuit board is detachably mounted on the sensor fixing bottom shell, the bottom of the sensor fixing bottom shell is sleeved on the inner side of the sensor fixing upper cover, and is buckled and connected with the sensor fixing upper cover through a plurality of buckles and slots.

[0034] Compared with the prior art, the beneficial effects of the utility model are:

[0035] The utility model forms a second chamber for placing a thermistor through the first through hole of the socket fixing cover, the upper surface of the sensor fixing bottom shell and the probe bottom shell, and the tail of the thermistor is supported by a support member. The arrangement of the support member not only ensures the close contact between the thermistor and the metal inner wall of the probe bottom shell, but also prevents the thermistor from being damaged due to excessive force. The arrangement of the second chamber can effectively isolate the head of the thermistor from the first chamber where the sensor circuit board is located, thereby minimizing the influence of the sensor temperature on the thermistor, improving the measurement accuracy and avoiding the problem of inaccurate temperature compensation.

[0036] The utility model sets a second chamber so that the probe part of the alarm is designed with a thermistor, which can accurately monitor the ambient temperature and perform accurate temperature compensation on the sensor. At the same time, the thermistor, sensor circuit board, sensor fixed bottom shell and sensor fixed upper cover in the utility model can form a whole. When replacing, the whole assembly can be unplugged and replaced with a new one. Compared with the existing design, the sensor and the thermistor can be replaced at the same time, and the socket part is always connected to the main control circuit board of the alarm, eliminating the action of opening the upper cover of the alarm, making replacement and maintenance more convenient, and ensuring the accuracy of the temperature monitored by the thermistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural explosion diagram of a structure for fixing the thermistor of a catalytic combustion type industrial alarm disclosed in an embodiment of the utility model;

[0038] Figure 2 It is a structural side sectional view of a structure for fixing a thermistor of a catalytic combustion type industrial alarm disclosed in the first embodiment of the utility model;

[0039] Figure 3 It is a structural side sectional view of a structure for fixing a thermistor of a catalytic combustion type industrial alarm disclosed in a second embodiment of the utility model;

[0040] Figure 4 It is a structural side sectional view of a structure for fixing a thermistor of a catalytic combustion type industrial alarm disclosed in a third embodiment of the utility model;

[0041] Figure 5 It is a structural side sectional view of a structure for fixing a thermistor of a catalytic combustion type industrial alarm disclosed in a third embodiment of the utility model;

[0042] Figure 6 It is a structural side sectional view of a structure for fixing a thermistor of a catalytic combustion type industrial alarm disclosed in a fourth embodiment of the utility model;

[0043] Figure 7It is a structural side sectional view of a structure for fixing a thermistor of a catalytic combustion type industrial alarm disclosed in a fourth embodiment of the utility model;

[0044] Figure 8 A structural side sectional view of a structure for fixing a thermistor of a catalytic combustion type industrial alarm disclosed in a fifth embodiment of the utility model;

[0045] Fig. 9 A structural side sectional view of a structure for fixing a thermistor of a catalytic combustion type industrial alarm disclosed in a fifth embodiment of the utility model;

[0046] Fig.10 It is a structural side sectional view of a structure for fixing a thermistor of a catalytic combustion type industrial alarm disclosed in a sixth embodiment of the utility model;

[0047] Fig.11 It is a structural side sectional view of a thermistor fixing structure of a catalytic combustion type industrial alarm disclosed in a sixth embodiment of the utility model.

[0048] In the figure:

[0049] 1. Probe bottom shell; 2. Probe upper cover; 3. Socket fixing cover; 31. Protruding mounting portion; 32. First through hole; 4. Sensor fixing bottom shell; 41. First convex portion; 42. Second through hole; 5. Sensor fixing upper cover; 6. Socket circuit board; 7. Sensor circuit board; 8. Thermistor; 9. Top block for thermistor; 10. Spring for thermistor; 11. Sponge for thermistor; 12. Sheath for thermistor; 13. FEP transparent tube; 100. Second chamber; 200. First chamber. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment 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.

[0051] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0052] In the description of the present invention, it is also necessary to explain 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, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected 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.

[0053] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0054] like Figure 1 As shown, according to a structure for fixing the thermistor of a catalytic combustion type industrial alarm disclosed in the utility model, the probe includes a probe housing, a socket portion and a sensor portion placed inside the probe housing; wherein the sensor portion includes a sensor fixing bottom shell 4 and a sensor fixing upper cover 5 which are clamped together up and down, and a first chamber 200 for installing a sensor circuit board 7 is formed between the sensor fixing bottom shell 4 and the sensor fixing upper cover 5; the socket portion includes a socket fixing cover 3, the socket fixing cover 3 is clamped on the top of the sensor fixing bottom shell 4, a first through hole 32 is provided on the socket fixing cover 3, and a second through hole 42 is provided on the sensor fixing bottom shell 4 corresponding to the first through hole 32; the probe housing includes a probe bottom shell 1 and a probe fixing cover 5 which are clamped together up and down. The head cover 2 and the probe bottom shell 1 are sleeved on the top of the socket fixing cover 3, the probe upper cover 2 is sleeved on the outer sides of the sensor fixing bottom shell 4 and the sensor fixing upper cover 5, the bottom of the probe bottom shell 1, the first through hole 32 and the upper surface of the sensor fixing bottom shell 4 together constitute a second chamber 100 for placing the thermistor 8, the head of the thermistor 8 is placed in the second chamber 100 and against the bottom inner wall of the probe bottom shell 1, the pin end of the thermistor 8 passes through the second through hole 42 and is electrically connected to the sensor circuit board 7, the tail of the thermistor 8 is supported by a support member, the support member is used to ensure that the thermistor 8 fits against the inner wall of the probe bottom shell 1, and the support member and the sensor fixing bottom shell 4 are used to isolate the first chamber 200 from the second chamber 100.

[0055] In this embodiment, a second chamber 100 for placing the thermistor 8 is formed by the first through hole 32 of the socket fixing cover 3, the upper surface of the sensor fixing bottom shell 4 and the probe bottom shell 1, and the tail of the thermistor 8 is supported by a support member. The setting of the support member not only ensures the close contact between the thermistor 8 and the metal inner wall of the probe bottom shell 1, but also prevents the thermistor 8 from being damaged due to excessive force. The setting of the second chamber 100 can effectively isolate the head of the thermistor 8 from the first chamber 200 where the sensor circuit board 7 is located, thereby minimizing the influence of the sensor temperature on the thermistor 8, improving the measurement accuracy and avoiding the problem of inaccurate temperature compensation.

[0056] Specific:

[0057] like Figure 1 As shown, in the above embodiment, preferably, the socket part further includes a socket circuit board 6, and the socket circuit board 6 is fixedly mounted on the socket fixing cover 3 by bolts, and the socket fixing cover 3 is provided with an internal thread fixing column for mounting the socket circuit board 6. During actual installation, the socket circuit board 6 is fixedly mounted on the socket fixing cover 3, and the fixing holes on the socket circuit board 6 are aligned with the internal thread fixing columns in the socket fixing cover 3, and the bolts pass through the fixing holes and the internal thread fixing columns in sequence, so as to complete the detachable connection between the socket circuit board 6 and the socket fixing cover 3.

[0058] In the above embodiment, preferably, one end of the top of the socket fixing cover 3 vertically protrudes upward to form a convex mounting portion 31, and the bottom of the probe bottom shell 1 is provided with a concave mounting portion for accommodating the convex mounting portion 31, and the convex mounting portion 31 of the socket fixing cover 3 is placed in the concave mounting portion; the center of the convex mounting portion 31 is provided with a first through hole 32 penetrating downward in the vertical direction, and the bottom of the probe bottom shell 1, the first through hole 32 and the upper surface of the sensor fixing bottom shell 4 together constitute a second chamber 100 for placing the head of the thermistor 8.

[0059] In the above embodiment, preferably, the side wall of the socket fixing cover 3 is symmetrically provided with two slide grooves along the vertical direction. During actual assembly, when the socket fixing cover 3 is placed above the sensor fixing bottom shell 4, the bottom of the socket fixing cover 3 is placed in the sensor fixing bottom shell 4, and the top of the sensor fixing bottom shell 4 is symmetrically provided with blocks that cooperate with the above-mentioned two slide grooves. The socket fixing cover 3 and the sensor fixing bottom shell 4 complete the assembly work through the cooperation of the blocks and the slide grooves.

[0060] In the above embodiment, preferably, a plurality of buckles are arranged around the bottom of the sensor fixed bottom shell 4, and a plurality of slots matching with the buckles are arranged around the upper inner side of the sensor fixed upper cover 5; the sensor circuit board 7 is detachably mounted on the sensor fixed bottom shell 4, and the bottom of the sensor fixed bottom shell 4 is sleeved on the inner side of the sensor fixed upper cover 5, and is buckled and connected with the sensor fixed upper cover 5 through a plurality of buckles and slots.

[0061] Embodiment 1:

[0062] like Figure 2 As shown, in this embodiment, the support member includes a top block 9 for thermistor and a spring 10 for thermistor; wherein, the top block 9 for thermistor is placed at the tail of the thermistor 8 and fits with the inner wall of the first through hole 32 of the socket fixing cover 3, and a center hole for the pin end of the thermistor 8 to pass through is provided in the center of the top block 9 for thermistor in the vertical direction downward, and the bottom of the top block 9 for thermistor is recessed inward to form an inner concave portion for placing the thermistor spring 10, and the inner concave portion is connected to the center hole, and the pin end of the thermistor 8 passes through the center hole and the second through hole 42 and is electrically connected to the sensor circuit board 7.

[0063] In the above embodiment, preferably, the thermistor spring 10 is sleeved on the pin end of the thermistor 8, and the upper end of the thermistor spring 10 is placed in the inner recess, and the lower end of the thermistor spring 10 is against the upper surface of the sensor fixed bottom shell 4. In this embodiment, the head of the thermistor 8 is supported by the thermistor top block 9 and the thermistor spring 10 to fit with the metal inner wall of the probe bottom shell 1 to more accurately monitor the ambient temperature; the thermistor top block 9 and the thermistor spring 10 are used to adjust the gap between the thermistor 8 and the metal inner wall of the probe bottom shell 1 so that the two fit more closely.

[0064] In the above embodiment, preferably, the top block 9 for thermistor is adapted to the inner diameter of the first through hole 32 .

[0065] Embodiment 2:

[0066] like Figure 3 As shown, in this embodiment, the support member includes a top block 9 for thermistor and a sponge 11 for thermistor; wherein, the top block 9 for thermistor is placed at the tail of the thermistor 8, the sponge 11 for thermistor is placed below the cushion block 9 for thermistor, and the sponge 11 for thermistor is fitted with the inner wall of the first through hole 32 of the socket fixing cover 3, and the centers of the top block 9 for thermistor and the sponge 11 for thermistor are both provided with a center hole for the pin end of the thermistor 8 to pass through, and the pin end of the thermistor 8 passes through the center hole and the second through hole 42 in sequence and is electrically connected to the sensor circuit board 7.

[0067] In this embodiment, the head of the thermistor 8 is supported by thermistor top block 9 and thermistor sponge 11 to fit with the metal inner wall of the probe bottom shell 1 to more accurately monitor the ambient temperature; the thermistor top block 9 and thermistor sponge 11 are used to adjust the gap between the thermistor 8 and the metal inner wall of the probe bottom shell 1 so that the two fit more closely.

[0068] In the above embodiment, preferably, the outer diameter of the thermistor sponge 11 is matched with the inner diameter of the first through hole 32 .

[0069] Embodiment 3:

[0070] like Figure 4-5 As shown, in this embodiment, the support member includes a top block 9 for thermistor, a spring 10 for thermistor and a sheath 12 for thermistor; wherein, the sensor fixing bottom shell 4 protrudes upward corresponding to the position of the first through hole 32 to form a first convex portion 41, and the first convex portion 41 is vertically downwardly provided with a second through hole 42 that passes through the first chamber 200 corresponding to the position of the first through hole 32; the first through hole 32 of the socket fixing cover 3 is arranged in a stepped shape, and the inner diameter of the upper end of the first through hole 32 is smaller than the inner diameter of the lower end thereof, and the inner diameter of the lower end of the first through hole 32 is larger than the outer diameter of the first convex portion 41.

[0071] During actual installation, the socket fixing cover 3 is placed above the sensor fixing bottom shell 4, and the first protrusion 41 of the sensor fixing bottom shell 4 is placed on the large-diameter end of the first through hole 32 of the socket fixing cover 3, and the outer periphery of the first protrusion 41 is provided with a thermistor sheath 12, and the setting of the thermistor sheath 12 can effectively fill the gap between the first protrusion 41 and the inner wall of the first through hole 32, the head of the thermistor 8 is placed on the small-diameter end of the first through hole 32, and the tail of the thermistor 8 is vertically downwardly installed with a thermistor top block 9 and a thermistor spring 10 in sequence, the bottom center of the thermistor top block 9 protrudes downward to form a second protrusion, the outer side of the second protrusion is provided with a thermistor spring 10, and the bottom of the thermistor spring 10 is against the upper surface of the first protrusion 41, and the thermistor top block 9 and the center of its second protrusion are both provided with a center hole for the pin end of the thermistor 8 to pass through.

[0072] In the above embodiment, preferably, the outer diameters of the thermistor top block 9 and the thermistor spring 10 are matched with the inner diameter of the small-diameter end of the first through hole 32 .

[0073] In the above embodiment, the thermistor 8 is closely attached to the metal inner wall of the probe bottom shell 1 by the thermistor top block 9 and the thermistor spring 10, thereby achieving real-time monitoring of the ambient temperature. In addition, the second chamber 100 surrounded by the sensor circuit board fixing bottom shell 2, the thermistor sheath 12, and the thermistor top block 9 is isolated from the first chamber 200 where the sensor circuit board 7 is located, thereby minimizing the influence of the heat conduction of the sensor on the thermistor 8.

[0074] Embodiment 4:

[0075] like Figure 6-7As shown, in this embodiment, the support member includes a top block 9 for thermistor, a spring 10 for thermistor and a FEP transparent tube 13; wherein, the top block 9 for thermistor is placed at the tail of the thermistor 8, the FEP transparent tube 13 is sleeved on the outer side of the pin end of the thermistor 8, and the upper end of the FEP transparent tube 13 is against the bottom of the top block 9 for thermistor, the lower end of the FEP transparent tube 13 passes through the second through hole 42 and then abuts on the sensor circuit board 7, and the spring 10 for thermistor is sleeved on the FEP transparent tube 13 between the top block 9 for thermistor and the upper surface of the sensor fixed bottom shell 4.

[0076] In the above embodiment, the thermistor top block 9 and the thermistor spring 10 are used to closely fit the thermistor 8 to the metal inner wall of the probe bottom shell 1, thereby achieving real-time monitoring of the ambient temperature. In addition, the second chamber 100 formed by the sensor fixing bottom shell 4 and the FEP transparent tube 13; the thermistor top block 9 and the probe bottom shell 1 are isolated from the first chamber 200 where the sensor circuit board is located, thereby minimizing the influence of the heat conduction of the sensor on the thermistor 8.

[0077] In the above embodiment, preferably, the outer diameter of the FEP transparent tube 13 is matched with the inner diameter of the second through hole 42 .

[0078] Embodiment 5:

[0079] like Figure 8-9 As shown, in this embodiment, the support member includes a FEP transparent tube 13; wherein the sensor fixing bottom shell 4 protrudes upward corresponding to the position of the first through hole 32 to form a first convex portion 41, and the first convex portion 41 corresponds to the position of the first through hole 32 and is vertically downwardly provided with a second through hole 42 that penetrates the first chamber 200.

[0080] During actual installation, the socket fixing cover 3 is placed above the sensor fixing bottom shell 4, and the first protrusion 41 of the sensor fixing bottom shell 4 is sleeved in the first through hole 32 of the socket fixing cover 3, the thermistor 8 is placed in the second through hole 42 in the first protrusion 41, the head of the thermistor 8 is against the bottom inner wall of the probe bottom shell 1, and the tail of the thermistor 8 is sleeved with an FEP transparent tube 13, which is sleeved on the outer side of the pin end of the thermistor 8 in the vertical direction and penetrates the second through hole 42 to set

[0081] In the above embodiment, preferably, the outer diameter of the FEP transparent tube 13 is matched with the inner diameter of the second through hole 42 .

[0082] In the above embodiment, the thermistor 8 is directly supported and fitted to the inner wall of the probe bottom shell 1 by the FEP transparent tube 13, so as to realize real-time monitoring of the ambient temperature. In addition, the second chamber 100 surrounded by the sensor fixed bottom shell 4, the FEP transparent tube 13, and the probe bottom shell 1 is isolated from the first chamber 200 where the sensor circuit board is located, so as to minimize the influence of the heat conduction of the sensor on the thermistor 8.

[0083] Embodiment 6:

[0084] like Figure 10-11 As shown, in this embodiment, the sensor fixing bottom shell 4 protrudes upwards corresponding to the first through hole 32 to form a first convex portion 41, and the first convex portion 41 corresponds to the first through hole 32 and is vertically downwardly provided with a second through hole 42 that penetrates the first chamber 200.

[0085] During actual installation, the socket fixing cover 3 is placed above the sensor fixing bottom shell 4, and the first protrusion 41 of the sensor fixing bottom shell 4 is sleeved in the first through hole 32 of the socket fixing cover 3, the thermistor 8 is placed in the second through hole 42 in the first protrusion 41, the head of the thermistor 8 is against the bottom inner wall of the probe bottom shell 1, and the tail of the thermistor 8 is supported by a support member, which is formed by the inner wall of the second through hole 42 near one end of the thermistor 8 protruding inward to form a support portion adapted to the tail of the thermistor, and the pin end of the thermistor 8 passes through the second through hole 42 and is electrically connected to the sensor circuit board 7.

[0086] In the above embodiment, the thermistor 8 is supported and fitted to the inner wall of the probe bottom shell 1 by the support member formed by the support portion in the sensor fixing bottom shell 4, thereby realizing real-time monitoring of the ambient temperature. In addition, the second chamber 100 surrounded by the sensor fixing bottom shell 4 and the probe bottom shell 1 is isolated from the first chamber 200 where the sensor circuit board is located, thereby minimizing the influence of the heat conduction of the sensor on the thermistor 8.

[0087] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A structure for fixing thermistor of a catalytic combustion type industrial alarm, comprising a probe, characterized in that: The probe comprises a probe housing, a socket portion and a sensor portion disposed inside the probe housing; The sensor part comprises a sensor fixing bottom shell and a sensor fixing upper cover which are clamped together, and a first chamber for installing a sensor circuit board is formed between the sensor fixing bottom shell and the sensor fixing upper cover; The socket portion comprises a socket fixing cover, the socket fixing cover is clamped on the top of the sensor fixing bottom shell, the socket fixing cover is provided with a first through hole, and the sensor fixing bottom shell is provided with a second through hole corresponding to the first through hole; The probe housing includes a probe bottom shell and a probe upper cover which are clamped together. The probe bottom shell is sleeved on the socket fixing cover, and the probe upper cover is sleeved on the outer sides of the sensor fixing bottom shell and the sensor fixing upper cover. The bottom of the probe bottom shell, the first through hole and the upper surface of the sensor fixing bottom shell together constitute a second chamber for placing a thermistor. The head of the thermistor is placed in the second chamber and abuts against the bottom inner wall of the probe bottom shell. The pin end of the thermistor passes through the second through hole and is electrically connected to the sensor circuit board. The tail of the thermistor is supported by a support member, and the support member is used to ensure that the thermistor fits the inner wall of the probe bottom shell. The support member and the sensor fixing bottom shell are used to isolate the first chamber from the second chamber.

2. The structure according to claim 1, characterized in that: The socket part also includes a socket circuit board, and the socket circuit board is fixedly mounted on the socket fixing cover by means of bolts. An internal thread fixing column for mounting the socket circuit board is arranged in the socket fixing cover.

3. The structure according to claim 2, characterized in that: One end of the top of the socket fixing cover is vertically raised upward to form a convex mounting portion, and the bottom of the probe bottom shell is provided with a concave mounting portion for accommodating the convex mounting portion, and the convex mounting portion of the socket fixing cover is placed in the concave mounting portion; The center of the convex mounting portion is provided with the first through hole penetrating downward in the vertical direction, and the bottom of the probe bottom shell, the first through hole and the upper surface of the sensor fixing bottom shell together constitute the second chamber for placing the thermistor head.

4. The structure according to claim 1, characterized in that The support member includes a top block for thermistor and a spring for thermistor; The top block for thermistor is adapted to the inner diameter of the first through hole, a center hole is provided at the center of the top block for thermistor for the pin of the thermistor to pass through, the bottom of the top block for thermistor is recessed inward to form an inner concave portion for placing the spring for the thermistor, and the inner concave portion is connected to the center hole, and the pin end of the thermistor passes through the center hole and the second through hole and is electrically connected to the sensor circuit board; The thermistor spring is sleeved on the outside of the thermistor pin, and the upper end of the thermistor spring is placed in the inner concave portion, and the lower end of the thermistor spring is against the upper surface of the sensor fixing bottom shell.

5. The structure according to claim 1, characterized in that The support member includes a top block for thermistor and a sponge for thermistor; The top block for thermistor is placed at the tail of the thermistor, the sponge for thermistor is placed below the pad for thermistor and on the upper surface of the sensor fixed bottom shell, the top block for thermistor and the sponge for thermistor are both provided with a center hole for the pin end of the thermistor to pass through at the center, and the pin end of the thermistor passes through the center hole and the second through hole in sequence and then is electrically connected to the sensor circuit board; The outer diameter of the thermistor sponge is matched with the inner diameter of the first through hole.

6. The structure according to claim 1, characterized in that The support member includes a top block for thermistor, a spring for thermistor and a sheath for thermistor; The sensor fixing bottom shell protrudes upwards corresponding to the position of the first through hole to form a first convex portion, the first convex portion is provided with the second through hole at the position corresponding to the first through hole, the first convex portion is sleeved inside the first through hole, and the outer side of the first convex portion is sleeved with the thermistor sheath; The top block for thermistor is placed at the tail of the thermistor, and the bottom center of the top block for thermistor is convex downward to form a second convex portion, the thermistor spring is sleeved outside the second convex portion, and the bottom of the thermistor spring is against the upper surface of the first convex portion, and the top block for thermistor and the center of its second convex portion are both provided with a center hole for the pin end of the thermistor to pass through; The outer diameters of the thermistor top block and the thermistor spring are matched with the inner diameter of the first through hole.

7. The structure according to claim 1, characterized in that The support member includes a top block for thermistor, a spring for thermistor and a FEP transparent tube; The top block for thermistor is placed at the tail of the thermistor, the FEP transparent tube is sleeved on the outside of the pin end of the thermistor, and the upper end of the FEP transparent tube is against the bottom of the top block for thermistor, and the lower end of the FEP transparent tube passes through the second through hole and then against the sensor circuit board, and the outer diameter of the FEP transparent tube is adapted to the inner diameter of the second through hole; The thermistor spring is sleeved on the FEP transparent tube between the thermistor top block and the upper surface of the sensor fixing bottom shell.

8. The structure according to claim 1, characterized in that The support member includes a FEP transparent tube; The sensor fixing bottom shell protrudes upwards corresponding to the position of the first through hole to form a first convex portion, and the first convex portion is sleeved in the first through hole, and the center of the first convex portion is provided with the second through hole penetrating downwards; The thermistor is placed in the second through hole in the first convex portion, the head of the thermistor is against the bottom inner wall of the probe bottom shell, the tail of the thermistor is sleeved with the FEP transparent tube, and the FEP transparent tube is sleeved on the outer side of the pin end of the thermistor in the vertical direction and passes through the second through hole; The outer diameter of the FEP transparent tube is matched with the inner diameter of the second through hole.

9. The structure according to claim 1, characterized in that The sensor fixing bottom shell protrudes upwards corresponding to the position of the first through hole to form a first convex portion, and the first convex portion is sleeved in the first through hole; The center of the first convex portion is provided with the second through hole in a vertical direction downward, the thermistor is placed in the second through hole of the first convex portion, and the pin end of the thermistor passes through the second through hole and is electrically connected to the sensor circuit board; The inner wall of the second through hole at one end close to the thermistor protrudes inward to form the support member matched with the tail of the thermistor, and the head of the thermistor is supported by the support member to fit with the bottom inner wall of the probe bottom shell.

10. The structure according to claim 1, characterized in that The bottom of the sensor fixing bottom shell is surrounded by a plurality of buckles, and the upper inner side of the sensor fixing upper cover is surrounded by a plurality of slots matching with the buckles; The sensor circuit board is detachably mounted on the sensor fixing bottom shell, the bottom of the sensor fixing bottom shell is sleeved on the inner side of the sensor fixing upper cover, and is buckled and connected with the sensor fixing upper cover through a plurality of buckles and slots.

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