High-precision lengthened temperature measuring probe

Abstract

The utility model belongs to the technical field of temperature sensors, and particularly relates to a high-precision lengthened temperature measuring probe. Comprising a shell and a fixing support, the fixing support is axially inserted into a shaft cavity of the shell, and two wires with cable bunches penetrating through the fixing support are pressed and fixed in the fixing support; heat-conducting glue is filled between the temperature measuring element and the measuring cylinder end of the shell, and the temperature measuring element is connected with a wire; the clamp and the sealing ring are axially arranged on the cable bundle in a sleeving mode and assembled in a shaft cavity, away from one end of the temperature measuring element, of the shell, the clamp is fixed to the cable bundle in a pressing connection mode, the lower end of the clamp abuts against the sealing ring, and the upper end of the clamp is fixed to the turnup portion of the shell in a pressing mode. According to the utility model, the lengthened temperature measuring probe can reach the center of a temperature field, and the response is fast and the precision is high.

Description

Technical Field

[0001] This utility model belongs to the field of temperature sensor technology, and specifically relates to a high-precision extended temperature probe. Background Technology

[0002] Temperature sensors are used to measure the temperature of various media. With the development of precision control, the requirements for temperature measurement accuracy are increasing. However, existing short temperature probes cannot directly reach the center of the temperature field, resulting in large temperature measurement deviations. At the same time, existing cable bundles are installed in the probe housing, and the cable outlet is sealed with adhesive. Under external force, the cable bundle is easily pulled off, causing relative sliding between the cable bundle and the housing, resulting in seal failure and poor product reliability. Utility Model Content

[0003] The purpose of this invention is to provide a high-precision extended temperature probe. The cable bundle tail is reinforced with a clamp to prevent it from being pulled apart by external force. A rubber sealing ring is used to improve the sealing reliability. The extended temperature probe ensures that it can reach the center of the temperature field, resulting in fast response and high accuracy.

[0004] To solve the above-mentioned technical problems, this utility model provides a high-precision extended temperature probe, including a housing, and further comprising:

[0005] A fixed bracket is axially inserted into the shaft cavity of the housing, and the two wires through which the cable bundle passes are pressed and fixed inside the fixed bracket;

[0006] The temperature sensing element is filled with thermally conductive adhesive between itself and the measuring cylinder end of the outer shell, and the temperature sensing element is connected to a wire.

[0007] The clamp and the sealing ring are respectively axially sleeved on the cable bundle and assembled in the housing cavity at the end away from the temperature measuring element. The clamp is fixed to the cable bundle by crimping. The lower end of the clamp abuts against the sealing ring, and the upper end is pressed and fixed against the flange of the housing.

[0008] Preferably, the outer casing includes: a measuring cylinder and a mounting cylinder base; the measuring cylinder and the mounting cylinder base are an integral structure, and the measuring cylinder is a long-shaft cylinder structure, and the outer wall of the mounting cylinder base is provided with connecting threads.

[0009] Preferably, the mounting base also includes an integrally fitted locking nut for tightening the temperature probe.

[0010] Preferably, the fixing bracket is a snap-fit ​​split shell structure.

[0011] Preferably, the temperature sensing element is a thermistor, and the two pins of the thermistor are connected to the two wires by crimping through terminals.

[0012] Preferably, the clamp includes a bushing and an abutment plate. The lower end of the bushing is provided with the abutment plate. The bottom of the abutment plate abuts against the sealing ring and simultaneously abuts against the stepped groove on the outer shell.

[0013] Preferably, the sealing ring includes an axial sealing portion and a radial sealing portion; the lower end of the axial sealing portion is smoothly connected to the radial sealing portion, the bottom of the radial sealing portion is mutually limiting and abutting with the stepped groove on the outer shell, the cross-section of the axial sealing portion is a rectangular structure, and the cross-section of the radial sealing portion is a spherical structure.

[0014] Preferably, it also includes a sheath, the lower end of which is fitted over the outside of the clamp and pressed and fixed against the flange of the outer shell, and the cable bundle passes through the shaft hole at the upper end of the sheath.

[0015] Preferably, it also includes a connector that is connected to a terminal of the cable bundle at the end furthest from the temperature sensing element.

[0016] Preferably, the outer casing is made of a thermally conductive metal casing.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] This invention adds a clamp to the tail of the cable bundle, which is crimped and fixed to the cable bundle. Under external force, the cable bundle will not be pulled out, preventing the wire from detaching from the temperature sensing element due to pulling. A rubber sealing ring is used to improve sealing reliability, and an extended temperature probe ensures it reaches the center of the temperature field measurement area, resulting in fast response and high accuracy. Furthermore, because the temperature probe is extended, the wire is also extended. Since the wire is relatively soft, it is difficult to insert it into the housing. Therefore, a fixing bracket is added to facilitate the insertion of the wire into the housing for installation. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a high-precision extended temperature probe according to this utility model.

[0020] Figure 2 This is a structural diagram of the probe housing in this utility model.

[0021] Figure 3 This is a cross-sectional view of the probe housing in this utility model. Figure 1 .

[0022] Figure 4This is a cross-sectional view of the probe housing in this utility model. Figure 2 .

[0023] Figure 5 This is a structural diagram of the fixed bracket in this utility model.

[0024] In the diagram: 1-Outer shell, 11-Measuring cylinder, 12-Mounting cylinder base, 13-Flanged part, 14-Connecting thread, 15-Locking nut, 16-Step groove one, 17-Step groove two, 2-Fixed bracket, 3-Cable bundle, 31-Wire, 4-Temperature measuring element, 5-Clamp, 51-Shaft sleeve, 52-Abutment plate, 6-Sealing ring, 61-Axial sealing part, 62-Radial sealing part, 7-Sheath, 8-Connector. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0026] like Figures 1-5 As shown, this embodiment of the present invention provides a high-precision extended temperature probe, including a housing 1, and further comprising:

[0027] The fixing bracket 2 is axially inserted into the shaft cavity of the outer shell 1, and the two wires 31 passing through the cable bundle 3 are pressed and fixed inside the fixing bracket 2. As the probe is lengthened, the wires 31 will also be lengthened. Since the wires 31 are made of soft material, they are difficult to insert into the outer shell 1. Therefore, the fixing bracket 2 is added to facilitate installation.

[0028] The temperature sensing element 4 is filled with thermally conductive adhesive between itself and the measuring cylinder 11 end of the outer shell 1. The thermally conductive adhesive is made of a medium with a high thermal conductivity. The temperature sensing element 4 is connected to the wire 31. The temperature of the measuring area is conducted to the temperature sensing element 4 through the measuring cylinder 11 end and the thermally conductive adhesive. The temperature sensing element 4 can quickly sense the temperature in a short time and has a fast response.

[0029] The clamp 5 and the sealing ring 6 are respectively axially sleeved on the cable bundle 3 and assembled in the axial cavity of the outer shell 1 at the end away from the temperature measuring element 4. The clamp 5 is fixed to the cable bundle 3 by crimping to prevent external force from pulling, which could cause the connection point between the wire 31 and the temperature measuring element 4 to loosen or detach, thus shortening the service life. The lower end of the clamp 5 abuts against the sealing ring 6, and the upper end is pressed and fixed against the flange 13 of the outer shell 1, so that it is assembled and fixed with the outer shell 1 to ensure the overall stability of the structure. By designing the sealing ring 6, the phenomenon of sealing failure that is easily caused by the use of existing glue sealing methods can be avoided.

[0030] The outer casing 1 includes a measuring cylinder 11 and a mounting cylinder base 12. The measuring cylinder 11 and the mounting cylinder base 12 are integral structures, and the measuring cylinder 11 is a long shaft cylinder structure to realize an extended probe that can reach the center of the temperature field to be measured. The outer wall of the mounting cylinder base 12 is provided with a connecting thread 14 to facilitate threaded installation into the reserved shaft hole in the area to be measured.

[0031] The mounting base 12 also includes an integrally fitted locking nut 15, which is used to tighten the temperature probe by wrench.

[0032] The fixing bracket 2 is a snap-fit ​​split shell structure, which facilitates the disassembly and insertion of two wires 31, and fixes and presses the two wires 31 through the shaft holes in the fixing bracket 2 respectively.

[0033] The temperature sensing element 4 is a thermistor. The two pins of the thermistor are connected to the two wires 31 by crimping through the terminals. The thermistor has the advantages of high accuracy and fast measurement response.

[0034] The clamp 5 includes a bushing 51 and an abutment plate 52. The lower end of the bushing 51 is provided with the abutment plate 52, the bottom of which abuts against the sealing ring 6 and simultaneously limits and abuts against the stepped groove 16 on the outer casing 1. The bushing 51 is pressed and fixed to the cable bundle 3 by a pressing process, while the abutment plate 52 is used to limit and fix the clamp 5 to the stepped groove 16.

[0035] The sealing ring 6 includes an axial sealing part 61 and a radial sealing part 62. The lower end of the axial sealing part 61 is smoothly connected to the radial sealing part 62. The bottom of the radial sealing part 62 is limited and abuts against the stepped groove 17 on the outer shell 1. The cross-section of the axial sealing part 61 is rectangular, and the cross-section of the radial sealing part 62 is spherical. It also includes a sheath 7. The lower end of the sheath 7 is fitted over the clamp 5 and pressed and fixed against the flange 13 of the outer shell 1. The upper end of the sheath 7 has a shaft hole through which the cable bundle 3 passes. This rubber sealing ring 6 has good sealing performance. The sealing ring 6 seals the cable bundle 3 and the outer shell 1. The sheath 7 is made of plastic and has anti-bending protection. When the cable bundle 3 is bent by external force, the sheath 7's positioning prevents the cable bundle 3 from being misaligned with the sealing ring 6, and also does not affect the compression of the sealing ring 6.

[0036] It also includes connector 8, which is connected to the terminal of cable bundle 3 at the end away from the temperature sensing element 4. The thermistor converts the measured temperature into a resistance value, and outputs the resistance value signal to the processing chip on the external temperature sensor through the wire 31 of cable bundle 3 and connector 8.

[0037] The outer casing 1 is made of a thermally conductive metal casing, preferably a copper metal casing with high thermal conductivity.

[0038] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A high-precision extended temperature probe, comprising a housing (1), characterized in that, Also includes: A fixed bracket (2) is axially inserted into the shaft cavity of the outer shell (1), and the two wires (31) through which the cable bundle (3) passes are pressed and fixed inside the fixed bracket (2); The temperature measuring element (4) is filled with thermally conductive adhesive between itself and the measuring cylinder (11) end of the outer shell (1), and the temperature measuring element (4) is connected to the wire (31); The clamp (5) and the sealing ring (6) are respectively axially sleeved on the cable bundle (3) and assembled in the axial cavity of the outer shell (1) at the end away from the temperature measuring element (4). The clamp (5) is fixed to the cable bundle (3) by crimping. The lower end of the clamp (5) abuts against the sealing ring (6) and the upper end is pressed and fixed against the flange (13) of the outer shell (1).

2. The high-precision extended temperature probe as described in claim 1, characterized in that, The outer casing (1) includes: a measuring cylinder (11) and a mounting cylinder seat (12); the measuring cylinder (11) and the mounting cylinder seat (12) are an integral structure, and the measuring cylinder (11) is a long shaft cylinder structure, and the outer wall of the mounting cylinder seat (12) is provided with connecting threads (14).

3. The high-precision extended temperature probe as described in claim 2, characterized in that, The mounting base (12) also includes an integrally fitted locking nut (15) for tightening the temperature probe.

4. A high-precision extended temperature probe as described in claim 2, characterized in that, The fixed bracket (2) is a snap-fit ​​split shell structure.

5. A high-precision extended temperature probe as described in claim 1, characterized in that, The temperature measuring element (4) is a thermistor, and the two pins of the thermistor are connected to the two wires (31) by crimping through terminals.

6. The high-precision extended temperature probe as described in claim 1, characterized in that, The clamp (5) includes a bushing (51) and an abutment plate (52). The lower end of the bushing (51) is provided with the abutment plate (52). The bottom of the abutment plate (52) abuts against the sealing ring (6) and simultaneously abuts against the stepped groove (16) on the outer shell (1).

7. A high-precision extended temperature probe as described in claim 1, characterized in that, The sealing ring (6) includes an axial sealing part (61) and a radial sealing part (62); the lower end of the axial sealing part (61) is smoothly connected to the radial sealing part (62), and the bottom of the radial sealing part (62) is limited and abutted against the stepped groove (17) on the outer shell (1). The cross-section of the axial sealing part (61) is a rectangular structure, and the cross-section of the radial sealing part (62) is a spherical structure.

8. A high-precision extended temperature probe as described in claim 1, characterized in that, It also includes a sheath (7), the lower end of which is fitted over the outside of the clamp (5) and pressed and fixed against the flange (13) of the outer shell (1), and the cable bundle (3) passes through the shaft hole at the upper end of the sheath (7).

9. A high-precision extended temperature probe as described in any one of claims 1 to 8, characterized in that, It also includes a connector (8) that is connected to the terminal of the cable bundle (3) at the end away from the temperature sensing element (4).

10. A high-precision extended temperature probe as described in any one of claims 1 to 8, characterized in that, The outer casing (1) is made of a thermally conductive metal casing.

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