Fast-response armored temperature sensor and liquid rocket

Abstract

The utility model provides a fast-response armored temperature sensor and a liquid rocket. The sensor comprises a shell (4), a protective sleeve (2) in threaded connection with one end of the shell (4), a measuring cable (7) penetrating through the shell (4), a switching terminal (3) arranged in the protective sleeve (2), a switching cable (10) and a temperature measuring element (1). The conversion terminal (3) is fixedly connected to the shell (4); one end of the conversion terminal (3) is connected with the measuring cable (7), and the other end of the conversion terminal (3) is connected with the upper end of the conversion cable (10); and the temperature measuring element (1) is connected with the lower end of the switching cable (10). The influence of the low temperature of the tail on the temperature measurement of the temperature measuring element after the tail of the temperature sensor is soaked in low-temperature liquid is avoided; and the temperature sensor can bear a high-pressure environment in a measured object.

Description

Technical Field

[0001] This utility model relates to the technical field of temperature sensor devices, specifically to a fast-response armored temperature sensor and a liquid rocket. Background Technology

[0002] Temperature sensors are used to measure the temperature of the surface of an object. Commonly used temperature sensors include thermocouple temperature sensors, platinum resistance temperature sensors, and thermistor temperature sensors. Depending on the measurement location, there are both surface-mount and insertion types available.

[0003] In liquid rockets, some temperature measuring points, in addition to needing to withstand high pressure, require the tail of the temperature sensor to be completely immersed in cryogenic liquid. The low temperature will be rapidly transferred from the metal part at the tail of the sensor along the metal shell to the end of the shell, affecting the temperature measurement of the temperature measuring element encapsulated inside the end of the metal shell.

[0004] In summary, the existing technology has the following problems: the temperature sensor measurement of existing liquid rockets is easily affected, resulting in inaccurate temperature measurement. Utility Model Content

[0005] This invention provides a fast-response armored temperature sensor, which solves the technical problem of how to improve the temperature measurement accuracy of existing liquid rocket temperature sensors.

[0006] To achieve the above objectives, this utility model proposes a fast-response armored temperature sensor, comprising:

[0007] The housing, the protective sleeve threaded to one end of the housing, the measuring cable passing through the housing, and the adapter terminal, adapter cable and temperature measuring element all disposed inside the protective sleeve;

[0008] The adapter terminal is fixedly connected to the housing;

[0009] One end of the adapter terminal is connected to the measuring cable, and the other end of the adapter terminal is connected to the upper end of the adapter cable; the temperature measuring element is connected to the lower end of the adapter cable.

[0010] Specifically, the adapter terminal includes: a body, a lead post penetrating the body, and a glass cavity that fixes the lead post within the body;

[0011] The lead post includes an upper lead post and a lower lead post; the upper lead post is connected to the measuring cable via fiber optic soldering; the lower lead post is connected to the adapter cable via fiber optic soldering.

[0012] Specifically, the housing and the adapter terminal are welded together to form a sealed cavity, which is filled with adhesive to fix the measuring cable.

[0013] Specifically, a first thread is provided on the lower middle part of the outer surface of the housing, and a third thread is provided on the bottom end of the outer surface of the housing;

[0014] The housing is connected to the protective sleeve via the third thread, and the housing is threadedly connected to the object under test via the first thread, so that at least a portion of the housing is fixed inside the object under test.

[0015] Specifically, the housing is provided with a sealing groove, which is located above the first thread, and the housing forms a seal with the object being tested using the sealing groove.

[0016] Specifically, the upper end of the housing is threaded with a pressure sleeve, and the measuring cable passes through the opening at the top of the pressure sleeve and is connected to the plug.

[0017] Specifically, a protective spring and a pressure ring are sequentially arranged inside the pressure sleeve, and the pressure sleeve is connected to the housing by threads to form an integral structure;

[0018] The protective spring is disposed on the upper part of the pressure ring, and the pressure ring is in contact with the top end of the housing.

[0019] Specifically, the protective spring is an integral structure, comprising an inner spring and an outer spring;

[0020] The diameter of the inner spring is larger than the diameter of the outer spring;

[0021] The diameter of the outer spring is smaller than the diameter of the opening at the top of the pressure sleeve.

[0022] Specifically, the protective sleeve has multiple through holes at one end near the temperature sensing element, and the multiple through holes are evenly distributed circumferentially.

[0023] On the other hand, this utility model provides a liquid rocket equipped with the aforementioned fast-response armored temperature sensor.

[0024] The beneficial technical effects of the above-mentioned technical solution are as follows: This utility model uses an adapter terminal to place the internal temperature sensing element of the armored temperature sensor outside the housing, avoiding the influence of the low temperature at the tail of the temperature sensor on the temperature measurement of the sensing element after the tail is immersed in the cryogenic liquid. This solves the problem that temperature sensors in liquid rockets, whose tails need to be completely immersed in cryogenic liquid, cannot measure accurately. While solving the above problem, it can also adapt to high-pressure environments and applications requiring fast response, filling a gap in the industry. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a fast-response armored temperature sensor according to an embodiment of the present invention;

[0026] Figure 2 This is a cross-sectional structural diagram of the adapter terminal of a fast-response armored temperature sensor according to an embodiment of the present invention.

[0027] Figure 3 for Figure 2 A schematic diagram of AA;

[0028] Figure 4 This is a schematic diagram of the press assembly according to an embodiment of the present utility model.

[0029] Figure 5 This is a schematic diagram showing the connection between the adapter terminal and the measuring cable and the adapter cable in an embodiment of this utility model;

[0030] Figure 6 This is a cross-sectional structural diagram of the shell according to an embodiment of the present utility model;

[0031] Figure 7 This is a cross-sectional structural diagram of the pressure sleeve according to an embodiment of the present utility model;

[0032] Figure 8 This is a top view of the pressure sleeve according to an embodiment of the present utility model;

[0033] Figure 9 This is a schematic diagram of the protective spring according to an embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the pressure ring structure according to an embodiment of the present utility model.

[0035] Explanation of icon numbers:

[0036] 1. Temperature sensing element; 2. Protective sleeve; 3. Adapter terminal; 4. Housing; 5. Pressure sleeve; 6. Protective spring; 7. Measuring cable; 8. Pressure ring; 9. Adhesive; 10. Adapter cable; 21. Through hole; 30. Body; 31. Upper lead post; 32. Lower lead post; 33. Glass cavity; 41. Sealing groove; 42. First thread; 43. Second thread; 44. Third thread; 61. Outer spring; 62. Inner spring. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] This utility model embodiment provides a fast-response armored temperature sensor, such as... Figure 1 As shown, the sensor includes: a housing 4, a protective sleeve 2 threaded to one end of the housing 4, a measuring cable 7 passing through the housing 4, an adapter terminal 3 disposed inside the protective sleeve 2, an adapter cable 10, and a temperature sensing element 1. The adapter terminal 3 is fixedly connected to the housing 4, and the adapter terminal 3 is connected to the housing 4 by, for example, laser welding. One end of the adapter terminal 3 is connected to the measuring cable 7, and the other end of the adapter terminal 3 is connected to the upper end of the adapter cable 10. The temperature sensing element 1 is connected to the lower end of the adapter cable 10, and the temperature sensing element 1 and the adapter cable 10 are connected by, for example, soldering. The adapter terminal 3 significantly reduces the amount of low temperature transmitted from the metal part at the tail of the sensor along the housing 4 to the end of the housing, thus improving the accuracy of the measured temperature.

[0039] Among them, such as Figure 3 As shown, the adapter terminal 3 includes: a body 30, a lead post penetrating the body 30, and a glass cavity 33 that fixes the lead post within the body; the glass cavity 33 is filled with a glass medium, which tightly fills around the lead post, thus fixing the lead post. Figure 2 As shown, the lead post includes an upper lead post 31 and a lower lead post 32. Both the upper and lower ends of the lead post extend from the main body and the glass cavity 33. The upper lead post 31 is connected to the measuring cable 7 via fiber optic soldering; the lower lead post 32 is connected to the adapter cable 10 via fiber optic soldering. The measuring cable 7 and the adapter cable 10 are multi-core shielded cables, and their lengths can be freely adjusted according to the temperature sensor installation requirements and the distance between the temperature measurement points. Using an adapter glass terminal, the internal temperature sensing element of the armored temperature sensor is placed outside the armored housing, avoiding the influence of the low temperature at the tail of the temperature sensor on the temperature measurement of the sensing element after the tail is immersed in a low-temperature liquid.

[0040] After the housing 4 and the adapter terminal 3 are welded together, a sealed cavity is formed. The sealed cavity is filled with adhesive 9, which can fix the measuring cable 7. The filling adhesive 9 is a free-flowing adhesive FFOC that is injected into the housing 4 during the sensor assembly process. After injection, the adhesive 9 slowly solidifies to fix the relative position of the measuring cable 7 inside the housing 4.

[0041] like Figure 6 As shown, a first thread 42 is provided on the lower middle part of the outer surface of the housing 4, a second thread 43 is provided on the upper part of the outer surface of the housing 4, and a third thread 44 is provided on the bottom end of the outer surface of the housing 4. During assembly, the housing 4 is connected to the protective sleeve 2 through the third thread 44, and the housing 4 is threadedly connected to the object being measured through the first thread 42, so that at least a part of the housing 4 is fixed inside the object being measured, while the protective sleeve 2, the adapter cable 10, and the temperature measuring element 1 are all inside the object being measured.

[0042] The housing 4 is provided with a sealing groove 41, which is above the first thread 42. A sealing gasket can be provided in the sealing groove 41. The housing 4 forms a seal with the object being tested by squeezing the sealing gasket in the sealing groove 41.

[0043] like Figure 7 , Figure 8 As shown, a pressure sleeve 5 is threadedly connected to the upper end of the housing 4, and the housing 4 is connected to the pressure sleeve 5 via a second thread 43. The connection between the pressure sleeve 5 and the housing 4 is improved by applying adhesive and chamfering to the threads. Specifically, before the connection, the threads of the pressure sleeve 5 and the housing 4 are coated with thread-locking agent (i.e., applied adhesive). After the threads are tightened, chamfering is performed through a pre-reserved chamfering hole in the pressure sleeve 5. During assembly, a protective spring 6 and a pressure ring 8 are sequentially assembled inside the pressure sleeve 5, and then the pressure sleeve 5 is threadedly connected to the housing 4 to form an integrated structure. The measuring cable 7 passes through the opening at the top of the pressure sleeve 5 and connects to the plug, which connects to the rear-end measurement and acquisition system. The protective spring 6 is located on the upper part of the pressure ring 8, and the pressure ring 8 contacts the top of the housing 4.

[0044] like Figure 4 As shown, the protective spring 6 is an integral structure, which includes an inner spring 62 and an outer spring 61;

[0045] like Figure 9 As shown, the diameter of the inner spring 62 is larger than the diameter of the outer spring 61; the diameter of the outer spring 61 is smaller than the diameter of the opening at the top of the pressure sleeve 5.

[0046] The inner spring 62 is the lower half of the protective spring 6, and the outer spring 61 is the upper half of the protective spring 6; the diameter of the upper half of the protective spring 6 is smaller than the diameter of the hole at the top of the pressure sleeve 5.

[0047] The protective sleeve 2 has multiple through holes 21 at the end near the temperature sensing element 1, and these through holes 21 are evenly distributed circumferentially. This allows the temperature sensing element 1 to quickly and fully contact the object being measured, improving the product response time. Preferably, the diameter of the through holes is 1mm, 2mm, or 3mm.

[0048] After the temperature sensor is installed, the internal pressure of the adapter terminal 3 near the temperature sensing element 1 is the same as the internal pressure of the object being measured; the internal pressure of the adapter terminal 3 near the housing 4 is the same as the external pressure of the object being measured. The pressure-bearing components mainly include: the adapter terminal 3, the housing 4, and the weld between the adapter terminal 3 and the housing 4. The strength of these pressure-bearing components must meet 1.2 to 1.5 times the working pressure of the object being measured. The temperature sensor can withstand a high-pressure environment inside the object being measured; currently, the pressure resistance of the product used on rockets has been verified to 40 MPa gas.

[0049] This utility model embodiment provides a fast-response armored temperature sensor, such as... Figure 2As shown, this utility model uses an adapter terminal to place the internal temperature sensing element of the armored temperature sensor outside the housing, avoiding the influence of the low temperature at the tail of the temperature sensor on the temperature measurement of the sensing element after the tail of the temperature sensor is immersed in the low temperature liquid. It solves the problem that temperature sensors in liquid rockets that need to be completely immersed in the low temperature liquid at the tail cannot measure correctly. Under the premise of solving the above problems, it can also adapt to the use of high pressure environment and fast response requirements, filling a gap in the industry.

[0050] This utility model embodiment also provides a liquid rocket equipped with the aforementioned fast-response armored temperature sensor. For example... Figure 1 As shown, the armored temperature sensor mainly consists of a temperature sensing element 1, a protective sleeve 2, an adapter terminal 3, a housing 4, a pressure sleeve 5, a protective spring 6, a measuring cable 7, a pressure ring 8, a housing filling adhesive, and an adapter cable 10.

[0051] like Figure 5 As shown, adapter terminal 3 has built-in lead posts, which are soldered to measuring cable 7 and adapter cable 10. Adapter terminal 3 is laser-welded to housing 4. Figure 4 As shown, a protective spring 6 and a pressure ring 8 are sequentially assembled inside the pressure sleeve 5. The outer spring 61 of the protective spring 6 protrudes from the pressure sleeve 5. The pressure sleeve 5 and the housing 4 are connected by threads to form an integral structure. The bottom of the protective spring 6 is pressed tightly against the pressure ring 8, and the bottom of the pressure ring 8 is pressed tightly against the top of the housing 4. Figure 10 This is a side sectional view of the pressure ring 8, which is pressed onto the top of the housing 4, and its shape matches the top of the housing 4. The outer side of the housing 4 is provided with external threads, and the housing 4 is threadedly connected to the object being tested through the first thread 42. The housing 4 uses the sealing groove 41 to compress the sealing gasket with the object being tested to achieve structural sealing.

[0052] When using an armored temperature sensor, the temperature sensor with a high-pressure polyethylene protective sleeve 2 is inserted into the object being measured, so that the part below the sealing groove 41 of the housing 4 is inside the object being measured.

[0053] Because the diameter of the lower half of the protective spring 6 is larger than the diameter of the upper half, and the diameter of the upper half is smaller than the diameter of the opening at the top of the pressure sleeve 5, the upper half of the assembled protective spring 6 protrudes from the top of the pressure sleeve 5. This protruding protective spring 6 restricts the movement of the measuring cable 7, preventing it from bending and being damaged. The lower half of the protective spring 6 presses against the bottom pressure ring 8 within the pressure sleeve 5, thus pressing the pressure ring 8 against the top of the housing 4.

[0054] In addition, a sleeve and adhesive are added to the solder joints of the temperature sensing element 1 and the adapter cable 10 to increase reliability; the solder joints of the adapter terminal 3 and the measuring cable 7 and the adapter cable 10 are also sleeved and coated with adhesive to increase reliability.

[0055] The above are merely illustrative embodiments of this utility model and are not intended to limit the scope of this utility model. Since the various components of this utility model can be combined with each other without conflict, any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A fast-response armored temperature sensor, characterized in that, include: The housing (4), the protective sleeve (2) threaded to one end of the housing (4), the measuring cable (7) passing through the housing (4), and the adapter terminal (3), adapter cable (10) and temperature measuring element (1) all located inside the protective sleeve (2); The adapter terminal (3) is fixedly connected to the housing (4); One end of the adapter terminal (3) is connected to the measuring cable (7), and the other end of the adapter terminal (3) is connected to the upper end of the adapter cable (10); the temperature measuring element (1) is connected to the lower end of the adapter cable (10).

2. The fast-response armored temperature sensor according to claim 1, characterized in that, The adapter terminal (3) includes: a body (30), a lead post penetrating the body (30), and a glass cavity (33) that fixes the lead post in the body; The lead post includes an upper lead post (31) and a lower lead post (32); the upper lead post (31) is connected to the measuring cable (7) by fiber optic soldering; the lower lead post (32) is connected to the adapter cable (10) by fiber optic soldering.

3. The fast-response armored temperature sensor according to claim 1, characterized in that, The housing (4) is welded to the adapter terminal (3) to form a sealed cavity, which is filled with adhesive (9) to fix the measuring cable (7).

4. The fast-response armored temperature sensor according to claim 1, characterized in that, The lower middle part of the outer surface of the housing (4) is provided with a first thread (42), and the bottom end of the outer surface of the housing (4) is provided with a third thread (44); The housing (4) is connected to the protective sleeve (2) via the third thread (44), and the housing (4) is threadedly connected to the object under test via the first thread (42), so that at least a portion of the housing (4) is fixed inside the object under test.

5. A fast-response armored temperature sensor according to claim 4, characterized in that, The housing (4) is provided with a sealing groove (41), which is located above the first thread (42). The housing (4) forms a seal with the object under test by means of the sealing groove (41).

6. A fast-response armored temperature sensor according to claim 1, characterized in that, The upper end of the housing (4) is threaded with a pressure sleeve (5), and the measuring cable (7) passes through the opening at the top of the pressure sleeve (5) and is connected to the plug.

7. A fast-response armored temperature sensor according to claim 6, characterized in that, The pressure sleeve (5) is provided with a protective spring (6) and a pressure ring (8) in sequence inside. The pressure sleeve (5) and the housing (4) are connected by threads to form an integral structure. The protective spring (6) is disposed on the upper part of the pressure ring (8), and the pressure ring (8) is in contact with the top end of the housing (4).

8. A fast-response armored temperature sensor according to claim 7, characterized in that, The protective spring (6) is an integral structure, which includes an inner spring (62) and an outer spring (61); The diameter of the inner spring (62) is larger than the diameter of the outer spring (61); The diameter of the outer spring (61) is smaller than the diameter of the opening at the top of the pressure sleeve (5).

9. A fast-response armored temperature sensor according to claim 1, characterized in that, The protective sleeve (2) has multiple through holes at one end near the temperature measuring element (1), and the multiple through holes are evenly distributed circumferentially.

10. A liquid rocket, characterized in that, It is equipped with a fast-response armored temperature sensor as described in any one of claims 1-9.

Images