Adjustable solid engine sensor fixing device

Abstract

The utility model belongs to the technical field of solid engine propellant burning rate testing, and particularly relates to an adjustable solid engine sensor fixing device. The utility model 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 utility model belongs to the technical field of solid rocket motor propellant burning rate testing, and particularly relates to an adjustable fixing device for a solid rocket motor sensor. Background Technique

[0002] A solid rocket motor provides power for a missile weapon system through the thrust generated by the efficient combustion of a solid propellant. Under typical working conditions, the main factors affecting the working performance of a solid rocket motor include the combustion rate of the propellant, the combustion chamber temperature, the working pressure, the internal pressure of the combustion chamber, etc. Therefore, the real-time dynamic testing of the burning rate, burning surface recession, thrust, and specific impulse during the working process of a solid rocket motor has become the focus and core issue of research.

[0003] When real-time dynamically monitoring parameters such as the burning rate and burning surface of the engine combustion chamber during the ignition process of a solid rocket motor, it is required that the measurement sensor be in contact with the outer surface of the engine casing. However, due to the high temperature, high pressure, heat conduction, high-pressure expansion, and high-frequency vibration during the ignition process of a solid rocket motor, the measurement sensor and the engine casing may be instantaneously separated during the working process, resulting in the sensor being unable to accurately collect data.

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

[0005] In terms of static burning rate testing, two forms, namely the target line method and the underwater acoustic emission method, are specified in the national military standard. Among them, the target line method belongs to the traditional measurement method and can be applied to the average burning rate testing of high-burning-rate and ultra-low-burning-rate propellants, but it cannot achieve real-time monitoring during the working process; the underwater acoustic emission method monitors through the acoustic signals during the combustion process of the propellant, but it is extremely susceptible to external environmental influences.

[0006] In terms of dynamic burning rate testing, the line scan imaging method can measure the change of the burning surface over time during the combustion process of solid propellants, but its test success rate is relatively low; technologies such as ultrasonic dynamic burning rate testing, closed bomb dynamic burning rate testing, and high-speed imaging are expensive and bulky, and belong to secondary imaging, which is not suitable for engineering applications in solid rocket motor burning rate measurement.

[0007] In the prior art, a millimeter-wave radio frequency signal transmitter and a receiving device are also pasted on the surface of the engine casing, and the real-time monitoring of the engine working process is realized by monitoring the change of the millimeter-wave radio frequency signal. However, when the millimeter-wave radio frequency signal penetrates different media such as the engine casing, solid propellant, and flame, different attenuations and phase changes will occur, resulting in inaccurate data collection and inaccurate measurement results. Summary of the Invention

[0008] The utility model provides an adjustable fixing device for a solid engine sensor. The elastic force generated by spring compression is used to fix the contact state between the sensor and the solid engine, and the contact stress between the sensor and the solid engine can be adjusted according to the design state of the solid engine, so as to achieve the consistency of the sensor and the engine state during the test run of the solid engine, solve the problem that there will be an instantaneous separation between the ultrasonic probe of the sensor and the outer wall of the shell during the test run of the engine, and complete the accurate monitoring of the working state of the solid engine.

[0009] In order to achieve the above purpose, the utility model solves the above technical problems through the following technical solutions:

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

[0011] A sensor positioning module 1 for the contact and fixation between the sensor and the solid engine shell;

[0012] A sensor limiting module 2 for cooperating with the sensor positioning module 1 to position the sensor;

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

[0014] A spring 4 for adjusting the contact stress between the solid engine and the sensor;

[0015] A pressing plate 5 for fixing the relative position between the solid engine and the sensor.

[0016] An installation through hole 101 is provided in the middle position of the sensor positioning module 1. The sensor is placed in the installation through hole 101, and the transmitting end of the sensor contacts the outer surface of the engine shell.

[0017] First round holes 102 and second round holes 103 are symmetrically arranged on both sides of the installation through hole 101 for bolt connection.

[0018] A first circular groove 201 is provided on the lower surface of the sensor limiting module 2, and the top of the sensor is exactly placed in the first circular groove 201.

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

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

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

[0022] At the center position of the lower surface of the pressing plate 5, a second circular groove 501 is provided to limit the maximum outer diameter of the spring 4 and the maximum radial offset during the deformation of the spring 4.

[0023] A circular through-hole 502 is provided at the center position 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 limit of the installation position of the spring 4.

[0024] The pressing plate 5 is further provided with a third round hole 503 and a fourth round hole 504 symmetrically arranged with the circular through-hole 502 as the center for the pressing plate 5 to be fixedly connected with the sensor positioning module 1 by screws.

[0025] Based on the implementation of the above technical solutions, the utility model can obtain the following technical effects:

[0026] 1. An adjustable solid engine sensor fixing device provided by the utility model realizes the relative position fixation between the sensor and the solid engine through the elastic force of the spring. The sensor has a certain activity space, which can realize the consistency of the states of the sensor and the solid engine during the test run, and improve the measurement accuracy of the sensor.

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

[0028] 3. An adjustable solid engine sensor fixing device provided by the utility model, through special designs such as the small-diameter blind hole on the upper surface and the circular groove on the lower surface of the sensor limiting module, realizes the movement constraints in the axial and radial directions of the installation position of the spring fixing module, and further realizes the relative position fixation between the solid engine and the sensor.

[0029] 4. An adjustable solid engine sensor fixing device provided by the utility model, through the special structural design of the diameter cylinder and positioning rib plate of the spring fixing module, can not only restrict the axial movement of the spring fixing module, but also restrict the radial movement with the sensor limiting module, avoiding the position offset caused by vibration and affecting the monitoring accuracy of the sensor. Description of the Drawings

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

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

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

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

[0034] Figure 4 is a schematic structural diagram of a sensor limiting module provided by the present invention;

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

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

[0037] Reference numerals

[0038] 1 - Sensor positioning module;

[0039] 101 - Mounting through hole; 102 - First round hole; 103 - Second round hole;

[0040] 2 - Sensor limiting module;

[0041] 201 - First circular groove; 202 - Limiting groove; 203 - Small diameter blind hole;

[0042] 3 - Spring fixing module; 301 - Cylindrical body with diameter; 302 - Positioning rib plate;

[0043] 4 - Spring;

[0044] 5 - Pressing plate;

[0045] 501 - Second circular groove; 502 - Circular through hole; 503 Third round hole; 504 - Fourth round hole. Specific embodiments

[0046] The following further describes in detail the embodiments of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0047] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present utility model 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 a limitation on the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0048] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0049] In the embodiments of the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0050] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0051] Next, in combination with Figures 1-6 the adjustable solid engine sensor fixing device provided by the present utility model will be introduced in detail.

[0052] Combined with Figure 1 、 Figure 2 As shown, in the embodiment of the present utility model, the adjustable solid engine sensor fixing device includes:

[0053] A sensor positioning module 1 for the contact and fixation of the sensor with the solid engine housing;

[0054] A sensor limiting module 2 for cooperating with the sensor positioning module 1 to position the sensor;

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

[0056] A spring 4 for adjusting the contact stress between the solid engine and the sensor;

[0057] A pressing plate 5 for fixing 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 housing, the sensor is installed in the installation 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 inserted and connected with the sensor limiting module 2 to realize the movement constraints in the axial and radial directions of the spring fixing module 3.

[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 to fix the sensor limiting module 2, the spring fixing module 3 and the spring 4 into a sensor fixing integrated device.

[0061] Combined Figure 3 As shown, the sensor positioning module 1 is an arch structure similar to a "bridge". There is an installation through-hole 101 in the middle of the upper surface. The sensor is placed in the installation through-hole 101 and passes through the installation through-hole 101 to contact the outer surface of the engine housing.

[0062] Furthermore, first round holes 102 and second round holes 103 are symmetrically arranged on both sides of the installation through-hole 101 for bolt connection.

[0063] Furthermore, the arch structure on the lower surface of the sensor positioning module 1 exactly fits with the solid rocket motor housing. A rubber belt passes through the connecting shafts at both ends of the sensor positioning module 1 and is fixed to the surface of the solid rocket motor cylinder section.

[0064] Combined Figure 4 As shown, a first circular groove 201 is provided on the lower surface of the sensor limiting module 2. The top of the sensor exactly fits into this first circular groove 201.

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

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

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

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

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

[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 pressing plate 3 and the sensor limiting module 2 to avoid the position deviation of the spring 4 due to vibration.

[0072] Combined Figure 6 As shown, at the central position of the lower surface of the pressing plate 5, a second circular groove 501 is provided, which is used to limit the maximum outer diameter of the spring 4 and the maximum radial offset during the deformation of the spring 4.

[0073] Furthermore, a circular through-hole 502 is provided at the central position of the pressing plate 5, and the diameter cylinder 301 of the spring fixing module 3 is embedded in the circular through-hole 502, which is used for positioning with the spring fixing module 3 to realize the constraint and limit 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 symmetrically arranged with the circular through-hole 502 as the center, which are used for the pressing plate 5 to be fixedly connected with the sensor positioning module 1 by screws.

[0075] Furthermore, the pressing plate 5 realizes the relative position fixation between the solid rocket motor and the sensor through the elastic force of the spring. 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 limit of the installation position of the spring 4.

[0076] Embodiment

[0077] The contact stress between the solid rocket motor and the sensor is provided by the elastic force of the spring, and the stress magnitude can be adjusted according to the design state of the solid rocket motor, reducing the influence of the sensor on the test run state of the solid rocket motor.

[0078] Fix the sensor positioning module 1 to the outer surface of the engine housing through a strap, and fix the rubber belt to the surface of the cylindrical section of the solid rocket motor housing by passing through the connecting shafts at both ends of the sensor positioning module 1. To avoid direct contact between the metal positioning block and the engine surface, a rubber pad can be pasted on the contact surface of the module first.

[0079] After applying the coupling agent to the transmitting end of the ultrasonic sensor, install it in the installation through-hole 101 of the sensor positioning module 1 and pass through the installation through-hole 101. The transmitting end of the ultrasonic sensor contacts the outer surface of the engine housing.

[0080] Install the sensor limiting module 2 on the top of the ultrasonic sensor, install the spring 4 in the second circular groove 501 of the pressing plate 5, and fix it through the spring fixing module 3; calibrate the position with the sensor positioning module 1 according to the third circular hole 503 and the fourth circular hole 504 of the pressing plate 5, and use bolts for fastening connection to realize the stress contact between the solid rocket motor and the ultrasonic sensor.

[0081] Select the spring 4 and the corresponding spring fixing module 3 according to the engine design parameters. Then, fit the positioning rib 302 of the spring fixing module 3 into the limiting groove 202 of the sensor limiting module 2, and place the spring 4 on the positioning rib 302 of the spring fixing device 3 for position fixing. Then, pass the pressing plate 5 through the diameter cylinder 301 of the spring fixing device 3 for radial positioning, and fix and press it with two positioning screws. During the test, fine adjustment of the spring compression distance and compression force is achieved by controlling the depth position of the positioning screws, so as to load the pressing force on the ultrasonic sensor.

[0082] The utility model provides an adjustable fixing device for a solid engine sensor, which is applicable to the state monitoring during the ground test run of a solid rocket engine. If the sensor is fixed by other methods such as direct pasting or rigid connection, during the ignition process of the solid engine, due to the influence of the external environment, instantaneous separation may occur between the measurement sensor and the engine shell during the 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 utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An adjustable fixing device for a solid engine sensor, characterized in that Comprising: A sensor positioning module (1) for the contact and fixation of the sensor with the solid rocket motor casing; A sensor limiting module (2) 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) for adjusting the contact stress between the solid rocket motor and the sensor; A pressure plate (5) for fixing the relative position between the solid rocket motor and the sensor.

2. The adjustable solid engine sensor fixing device according to claim 1, wherein An installation through-hole (101) is provided at the middle position of the sensor positioning module (1), the sensor is placed in the installation through-hole (101), and the transmitting end of the sensor contacts the outer surface of the motor casing.

3. The adjustable solid engine sensor fixing device according to claim 2, wherein, A first round hole (102) and a second round hole (103) are symmetrically arranged on both sides of the installation through-hole (101) for bolt connection.

4. The adjustable solid engine sensor fixing device according to claim 3, characterized in that, A first circular groove (201) is provided on the lower surface of the sensor limiting module (2), and the top of the sensor is exactly placed in the first circular groove (201).

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

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

7. The adjustable solid engine sensor fixing device according to claim 6, wherein, 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, characterized in that, A second circular groove (501) is provided at the center position of the lower surface of the pressure plate (5) for restricting the maximum outer diameter of the spring (4) and the maximum radial offset during the deformation of the spring (4).

9. The adjustable solid engine sensor fixing device according to claim 8, characterized in that, A circular through-hole (502) is provided at the center position 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 realize the constraint and limitation of the installation position of the spring (4).

10. The adjustable solid engine sensor fixing device according to claim 9, wherein, The pressure plate (5) is further provided with a third round hole (503) and a fourth round hole (504) symmetrically arranged with the circular through-hole (502) as the center for the pressure plate (5) to be fixedly connected with the sensor positioning module (1) by screws.

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