Adjustable solid engine sensor fixing device

Abstract

The invention belongs to the technical field of solid engine propellant burning rate testing, and particularly relates to an adjustable solid engine sensor fixing device. The invention provides an adjustable solid engine sensor fixing device. The adjustable solid engine sensor fixing device comprises a sensor positioning module, a sensor limiting module, a spring fixing module, a spring and a pressing plate. The contact state of the sensor and the solid engine is fixed through the elastic force generated by compression of the spring, and the contact stress of the sensor and the solid engine can be adjusted according to the design state of the solid engine, so that the sensor and the engine are consistent in state in the test run process of the solid engine; the problem of instant separation between the ultrasonic probe and the outer wall of the shell in the engine test process is solved, and the working state of the solid engine is accurately monitored.

Description

Technical Field

[0001] The invention belongs to the technical field of solid engine propellant burning rate testing, and in particular relates to an adjustable solid engine sensor fixing device. Background Art

[0002] Solid engines provide power for missile weapon systems through the thrust generated by the efficient combustion of solid propellants. Under typical working conditions, the main factors affecting the performance of solid engines include propellant combustion rate, combustion chamber temperature, working pressure, and internal pressure of the combustion chamber. Therefore, real-time dynamic testing of burning rate, combustion surface retreat, thrust, and specific impulse during the operation of solid engines has become the focus and core issue of research.

[0003] During the solid engine ignition process, when conducting real-time dynamic monitoring of parameters such as the burning rate and burning surface in the engine combustion chamber, the measuring sensor is required to be in contact with the outer surface of the engine casing. However, due to the high temperature and pressure during the solid engine ignition process, heat conduction, high-pressure expansion and high-frequency vibration cause the measuring sensor and the engine casing to separate momentarily during operation, resulting in the sensor being unable to accurately collect data.

[0004] At present, the burning rate test methods of solid motor propellants are mainly divided into two categories: static burning rate test method of propellant strips and dynamic burning rate test of standard engines. The static burning rate test is used to study the burning rate characteristics under specified working pressure conditions, and the dynamic burning rate test is used to study the burning rate characteristics under dynamic working environment conditions.

[0005] In terms of static burning rate testing, the national military standards stipulate two methods: the target line method and the underwater acoustic emission method. The target line method is a traditional measurement method, which can be applied to the average burning rate test of high burning rate and ultra-low burning rate propellants, but cannot achieve real-time monitoring of the working process; the underwater acoustic emission method monitors through the acoustic signal of the propellant combustion process, but is easily affected by the external environment.

[0006] In terms of dynamic burning rate testing, the line scanning camera method can measure the changes in the burning surface over time during the combustion of solid propellants, but its test success rate is low; ultrasonic dynamic burning rate testing, closed explosive dynamic burning rate testing and high-speed camera technologies have expensive and bulky equipment and belong to secondary imaging, which are not suitable for engineering applications in solid engine burning rate measurement.

[0007] In the prior art, millimeter wave radio frequency signal transmitters and receivers are attached to the surface of the engine housing, and the changes in millimeter wave radio frequency signals are monitored to achieve real-time monitoring of the engine working process. However, when millimeter wave radio frequency signals penetrate different media such as engine housings, solid propellants, flames, etc., different attenuation and phase changes will occur, resulting in inaccurate data collection and inaccurate measurement results. Summary of the invention

[0008] The present invention provides an adjustable solid engine sensor fixing device, which fixes the contact state of the sensor and the solid engine through the elastic force generated by spring compression, can adjust the contact stress between the sensor and the solid engine according to the design state of the solid engine, achieve consistency of the state of the sensor and the engine during the solid engine test, solve the problem of instantaneous separation between the sensor ultrasonic probe and the outer wall of the shell during the engine test, and complete accurate monitoring of the working state of the solid engine.

[0009] In order to achieve the above object, the present invention solves the above technical problems through the following technical solutions:

[0010] An adjustable solid engine sensor fixing device, comprising:

[0011] The sensor positioning module 1 is used for contacting and fixing the sensor with the solid engine casing;

[0012] The sensor limit module 2 is used to cooperate with the sensor positioning module 1 to position the sensor;

[0013] A spring fixing module 3, used for fixing the spring 4;

[0014] Spring 4, used for adjusting the contact stress between the solid engine and the sensor;

[0015] The pressure plate 5 is used to fix the relative position between the solid engine and the sensor.

[0016] A mounting through hole 101 is provided in the middle of the sensor positioning module 1 , and the sensor is placed in the mounting through hole 101 , with the transmitting end of the sensor in contact with the outer surface of the engine housing.

[0017] The mounting through hole 101 is symmetrically provided with a first circular hole 102 and a second circular hole 103 on both sides thereof for bolt connection.

[0018] The lower surface of the sensor limiting module 2 is provided with a first circular groove 201 , and the top of the sensor is just placed in the first circular groove 201 .

[0019] A small-diameter blind hole 203 is provided at the center of the upper surface of the sensor limiting module 2 , and a rectangular groove limiting slot 202 is provided in communication therewith.

[0020] The spring fixing module 3 is composed of an integrally formed diameter cylinder 301 and a positioning rib 302 . The diameter cylinder 301 is placed in the small diameter blind hole 203 , and the positioning rib 302 is placed in the limiting groove 202 .

[0021] The spring 4 is nested on the diameter cylinder 301 of the spring fixing module 3 .

[0022] A second circular groove 501 is provided at the center of the lower surface of the pressure plate 5 to limit the maximum outer diameter of the spring 4 and the maximum radial displacement of the spring 4 during deformation.

[0023] A circular through hole 502 is provided at the center of the pressing plate 5 , and the diameter cylinder 301 of the spring fixing module 3 is embedded in the circular through hole 502 for positioning the spring fixing module 3 to realize the constraint and limitation of the installation position of the spring 4 .

[0024] The pressing plate 5 is further provided with a third circular hole 503 and a fourth circular hole 504 which are symmetrically arranged with the circular through hole 502 as the center, and are used for fixing the pressing plate 5 and the sensor positioning module 1 with screws.

[0025] Based on the implementation of the above technical solution, the present invention can achieve the following technical effects:

[0026] 1. The present invention provides an adjustable solid engine sensor fixing device, which fixes the relative position of the sensor and the solid engine through the elastic force of the spring. The sensor has a certain movable space, which can achieve consistency between the sensor and the solid engine state during the test run and improve the measurement accuracy of the sensor.

[0027] 2. The adjustable solid engine sensor fixing device provided by the present invention can adjust the elastic force by replacing the spring model to meet the application requirements of solid engines of different models.

[0028] 3. The present invention provides an adjustable solid engine sensor fixing device, which has special designs such as a small-diameter blind hole on the upper surface of the sensor limit module and a circular groove on the lower surface, to realize the movement constraint of the axial and radial directions of the installation position of the spring fixing module, thereby realizing the relative position fixation between the solid engine and the sensor.

[0029] 4. The present invention provides an adjustable solid engine sensor fixing device. The special structural design of the diameter cylinder and positioning ribs of the spring fixing module can constrain the axial movement of the spring fixing module and the radial movement of the sensor limit module, thereby avoiding position displacement due to vibration and affecting the sensor monitoring accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of the structure of the adjustable solid engine sensor fixing device provided by the present invention;

[0032] Figure 2 This is a structural exploded view of the adjustable solid engine sensor fixing device provided by the present invention;

[0033] Figure 3 It is a structural schematic diagram of the sensor positioning module provided by the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of the sensor limit module provided by the present invention;

[0035] Figure 5 It is a schematic diagram of the structure of the spring fixing module provided by the present invention;

[0036] Figure 6 It is a schematic diagram of the pressing plate structure provided by the present invention.

[0037] Reference numerals

[0038] 1-Sensor positioning module;

[0039] 101-mounting through hole; 102-first circular hole; 103-second circular hole;

[0040] 2-Sensor limit module;

[0041] 201-first circular groove; 202-limiting groove; 203-small diameter blind hole;

[0042] 3-spring fixing module; 301-diameter cylinder; 302-positioning rib plate;

[0043] 4- Spring;

[0044] 5-Pressing plate;

[0045] 501 - second circular groove; 502 - circular through hole; 503 - third circular hole; 504 - fourth circular hole. DETAILED DESCRIPTION

[0046] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0047] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of 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.

[0048] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0049] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0051] Combine the following Figure 1-Figure 6 The adjustable solid engine sensor fixing device provided by the present invention is introduced in detail.

[0052] Combination Figure 1 , Figure 2 As shown, in an embodiment of the present invention, the adjustable solid engine sensor fixing device comprises:

[0053] The sensor positioning module 1 is used for contacting and fixing the sensor with the solid engine casing;

[0054] The sensor limit module 2 is used to cooperate with the sensor positioning module 1 to position the sensor;

[0055] A spring fixing module 3, used for fixing the spring 4;

[0056] Spring 4, used for adjusting the contact stress between the solid engine and the sensor;

[0057] The pressure plate 5 is used to fix the relative position between the solid engine and the sensor.

[0058] Furthermore, the sensor positioning module 1 is fixed on the outer surface of the engine casing, the sensor is installed in the mounting through hole 101 of the sensor positioning module 1, the tail of the sensor is placed in the first circular groove 201 of the sensor limiting module 2, and the spring fixing module 3 is plugged and connected to the sensor limiting module 2 to realize the movement constraint of the spring fixing module 3 in the axial and radial directions.

[0059] Furthermore, the spring 4 is nested on the diameter cylinder 301 of the spring fixing module 3 , and the top is placed in the second circular groove 501 of the pressing plate 5 .

[0060] Furthermore, the pressing plate 5 and the sensor positioning module 1 are fixedly connected by bolts, and the sensor limiting module 2, the spring fixing module 3 and the spring 4 are fixed into a sensor fixing integrated device.

[0061] Combination Figure 3 As shown, the sensor positioning module 1 is an arch structure similar to a "bridge", with a mounting through hole 101 provided in the middle of the upper surface. The sensor is placed in the mounting through hole 101 and passes through the mounting through hole 101 to contact the outer surface of the engine casing.

[0062] Furthermore, a first circular hole 102 and a second circular hole 103 are symmetrically arranged on both sides of the mounting through hole 101 for bolt connection.

[0063] Furthermore, the arched structure on the lower surface of the sensor positioning module 1 is just fitted into the solid engine casing, and is fixed to the surface of the solid engine barrel section by passing through the connecting shafts at both ends of the sensor positioning module 1 with a rubber belt.

[0064] Combination Figure 4As shown, a first circular groove 201 is provided on the lower surface of the sensor limiting module 2 , and the top of the sensor is just placed in the first circular groove 201 .

[0065] Furthermore, a small-diameter blind hole 203 is provided at the center of the upper surface of the sensor limiting module 2, and a rectangular groove limiting groove 202 is provided in communication therewith.

[0066] Furthermore, the first circular groove 201 of the sensor limiting module 2 is used for installing the sensor, and the small diameter blind hole 203 on the upper surface cooperates with the circular through hole 502 of the pressure plate 5 to realize the movement constraint of the installation position of the spring fixing module 3 in the axial and radial directions.

[0067] Furthermore, the limiting groove 202 is installed and positioned with the positioning rib 302 of the spring fixing module 3 to limit the circumferential rotational movement of the spring solid module 3 .

[0068] Combination Figure 5 As shown, the spring fixing module 3 is composed of an integrally formed diameter cylinder 301 and a positioning rib 302 , wherein the diameter cylinder 301 is placed in the small diameter blind hole 203 , and the positioning rib 302 is placed in the limiting groove 202 .

[0069] Furthermore, the special structural design of the spring fixing module 3 realizes installation and fixation with the spring 4, the pressure plate 5 and the sensor limit module 2. The intermediate diameter cylinder 301 constrains the axial movement of the spring fixing module 3 to prevent the vibration caused by the impact from affecting the sensor monitoring accuracy.

[0070] Furthermore, the spring 4 is nested on the diameter cylinder 301 of the spring fixing module 3 .

[0071] Furthermore, the positioning rib 302 is used to constrain the radial position of the spring 4 between the pressure plate 3 and the sensor limit module 2 to prevent the spring 4 from shifting in position due to vibration.

[0072] Combination Figure 6 As shown, a second circular groove 501 is provided at the center of the lower surface of the pressure plate 5 to limit the maximum outer diameter of the spring 4 and the maximum radial displacement of the spring 4 during deformation.

[0073] Furthermore, a circular through hole 502 is provided at the center of the pressure plate 5 , and the diameter cylinder 301 of the spring fixing module 3 is embedded in the circular through hole 502 for positioning with the spring fixing module 3 to realize the constraint and limitation of the installation position of the spring 4 .

[0074] Furthermore, the pressing plate 5 is also provided with a third circular hole 503 and a fourth circular hole 504 which are symmetrically arranged with the circular through hole 502 as the center, and are used for fixing the pressing plate 5 and the sensor positioning module 1 with screws.

[0075] Furthermore, the pressure plate 5 fixes the relative position between the solid engine and the sensor through the elastic force of the spring, and the third circular hole 503 and the fourth circular hole 504 are used for positioning with the spring fixing device 3 to realize the constraint and limitation of the installation position of the spring 4.

[0076] Example

[0077] The contact stress between the solid engine and the sensor is provided by the elastic force of the spring. The stress can be adjusted according to the design state of the solid engine to reduce the influence of the sensor on the test state of the solid engine.

[0078] Fix the sensor positioning module 1 to the outer surface of the engine casing by means of a binding strap, and pass the rubber belt through the connecting shafts at both ends of the sensor positioning module 1 to fix it to the surface of the solid engine casing barrel section. To avoid direct contact between the metal positioning block and the engine surface, a rubber pad may be pasted on the contact surface of the module first.

[0079] After the ultrasonic sensor transmitting end is coated with coupling agent, it is installed in the mounting through hole 101 of the sensor positioning module 1 and passes through the mounting through hole 101 , so that the transmitting end of the ultrasonic sensor contacts the outer surface of the engine housing.

[0080] The sensor limiting module 2 is installed on the top of the ultrasonic sensor, the spring 4 is installed in the second circular groove 501 of the pressure plate 5, and fixed by the spring fixing module 3; the position is calibrated with the sensor positioning module 1 according to the third circular hole 503 and the fourth circular hole 504 of the pressure plate 5, and bolts are used for fastening connection to achieve stress contact between the solid engine and the ultrasonic sensor.

[0081] According to the engine design parameters, the spring 4 and the corresponding spring fixing module 3 are selected, and then the positioning rib 302 of the spring fixing module 3 is matched and installed in the limiting groove 202 of the sensor limiting module 2, and the spring 4 is placed on the positioning rib 302 of the spring fixing device 3 for position fixing. Then the pressure plate 5 is passed through the diameter cylinder 301 of the spring fixing device 3 for radial positioning, and is fixed and compressed by two positioning screws. During the test, the spring compression distance and the fine adjustment of the compression force are tested by controlling the depth of the positioning screws to achieve the loading of the ultrasonic sensor compression force.

[0082] The present invention provides an adjustable solid engine sensor fixing device, which is suitable for status monitoring during ground test of solid rocket engines. If the sensor is fixed by other means such as direct bonding or rigid connection, the solid engine ignition process may be affected by the external environment, causing the measuring sensor and the engine casing to be separated momentarily during operation, resulting in inaccurate monitoring data.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adjustable solid rocket engine sensor fixing device, characterized in that: Include: A sensor positioning module (1), used for contacting and fixing the sensor with the solid engine casing; A sensor limiting module (2), used for cooperating with the sensor positioning module (1) to position the sensor; A spring fixing module (3) for fixing the spring (4); A spring (4) is used to adjust the contact stress between the solid engine and the sensor; The pressure plate (5) is used to fix the relative position between the solid engine and the sensor.

2. The adjustable solid engine sensor fixing device according to claim 1 is characterized in that: A mounting through hole (101) is provided in the middle of the sensor positioning module (1), the sensor is placed in the mounting through hole (101), and the transmitting end of the sensor is in contact with the outer surface of the engine casing.

3. The adjustable solid engine sensor fixing device according to claim 2 is characterized in that: The mounting through hole (101) is symmetrically provided with a first circular hole (102) and a second circular hole (103) on both sides thereof for bolt connection.

4. The adjustable solid engine sensor fixing device according to claim 3 is characterized in that: The lower surface of the sensor limit module (2) is provided with a first circular groove (201), and the top of the sensor is just placed in the first circular groove (201).

5. The adjustable solid engine sensor fixing device according to claim 4 is characterized in that: A small-diameter blind hole (203) is provided at the center of the upper surface of the sensor limiting module (2), and a rectangular groove limiting groove (202) is provided in communication therewith.

6. The adjustable solid rocket engine sensor fixing device according to claim 5, characterized in that: The spring fixing module (3) is composed of an integrally formed diameter cylinder (301) and a positioning rib plate (302); the diameter cylinder (301) is placed in a small diameter blind hole (203), and the positioning rib plate (302) is placed in a limiting groove (202).

7. The adjustable solid engine sensor fixing device according to claim 6 is characterized in that: The spring (4) is nested on the diameter cylinder (301) of the spring fixing module (3).

8. The adjustable solid engine sensor fixing device according to claim 7 is characterized in that: A second circular groove (501) is provided at the center of the lower surface of the pressure plate (5) for limiting the maximum outer diameter of the spring (4) and the maximum radial displacement of the spring (4) during deformation.

9. The adjustable solid rocket engine sensor fixing device according to claim 8, characterized in that: A circular through hole (502) is provided at the center of the pressure plate (5), and the diameter cylinder (301) of the spring fixing module (3) is embedded in the circular through hole (502) for positioning the spring fixing module (3) to achieve constraint and limitation on the installation position of the spring (4).

10. The adjustable solid rocket engine sensor fixing device according to claim 9, characterized in that: The pressing plate (5) is also provided with a third circular hole (503) and a fourth circular hole (504) which are symmetrically arranged with the circular through hole (502) as the center, and are used for fixing the pressing plate (5) and the sensor positioning module (1) with screws.

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