Airtight test clamp for drag cone system

Abstract

The utility model discloses an airtight test clamp for a drag cone system. The airtight test clamp for the towing cone system comprises a clamp body, the clamp body comprises an upper cover and a lower cover, and the upper cover and the lower cover are connected in an attached mode to form a containing cavity for containing a static pressure sensing pipe of the towing cone system; the gas pipe joint is arranged on the clamp body and is communicated with the accommodating cavity in the clamp body through gas; and the sealing body is located between the upper cover and the lower cover and arranged to at least partially surround the static pressure sensing pipe, and the sealing body is provided with a communication part which is in airflow communication with the air pipe connector. According to the airtight test clamp provided by the utility model, the rapid and reliable connection of the atmosphere data calibration equipment and the towing cone static pressure sensing tube can be realized, and the transmission of the air pressure from the atmosphere data calibration equipment to the towing cone system is further realized.

Description

Technical Field

[0001] The utility model relates to an air tightness test of a drag cone system in a flight test, and specifically, to an air tightness test fixture of a drag cone system for quickly and reliably connecting a static pressure sensing tube of a drag cone in the air tightness test of the drag cone system. Background Art

[0002] The flight test includes airspeed calibration, stall speed, flight thrust determination, flutter, RVSM and other test flights. In these test flights, it is usually necessary to use a drag cone system to bring a static pressure source away from the fuselage and not affected by the aircraft airflow disturbance to the cabin for measurement. The drag cone static pressure method has the characteristics of high measurement accuracy, no airspace restrictions, high test flight takeoff and landing success rate, and good data regularity. It is a static pressure measurement method widely recognized and recommended internationally.

[0003] To ensure the accuracy of the data, the drag cone system needs to be tested for air tightness before and after the flight. The common method is to reserve a three-way joint in the cabin and seal it with a plug. During the air tightness test, the plugging cap of the three-way joint is removed, and the atmospheric data calibration equipment is connected through the joint. At the same time, the static pressure hole on the static pressure sensing tube in the drag cone system needs to be wrapped and sealed with tape to achieve the air tightness of the drag cone system. The problem with this method is that the plugging cap of the three-way joint needs to be reinstalled after the air tightness test. At this time, it is difficult to ensure whether the drag cone system is airtight. In addition, the static pressure hole on the static pressure sensing tube needs to be wrapped and sealed with tape during the test. The operation is complicated and cannot achieve a quick and reliable connection between the atmospheric data calibration equipment and the drag cone system.

[0004] Therefore, it is expected to provide a means for quickly and reliably making an airtight connection of a device before an airtight test, to replace the existing complicated sealing method. Utility Model Content

[0005] In order to overcome the deficiencies in the prior art, an airtight test fixture for a drag cone system comprises: a fixture body, the fixture body comprising an upper cover and a lower cover, the upper cover and the lower cover being attached to form a housing cavity for receiving a static pressure sensing tube of the drag cone system; an air pipe joint, the air pipe joint being arranged on the fixture body to connect the air to the housing cavity in the fixture body; and a sealing body, the sealing body being located between the upper cover and the lower cover and arranged to at least partially surround the static pressure sensing tube, the sealing body having a connecting portion which is in air flow communication with the air pipe joint.

[0006] According to one aspect of the utility model, the upper cover and the lower cover are connected together at their respective first sides by a hinge device, and a fastening device for locking the upper cover and the lower cover together is provided on a second side of at least one of the upper cover and the lower cover opposite to the first side.

[0007] According to another aspect of the present invention, the fastening device includes a quick-locking device, which is attached to one of the upper cover and the lower cover and can be locked to the other of the upper cover and the lower cover.

[0008] According to another aspect of the utility model, the quick-locking device includes a quick-locking nut assembly, which includes a butterfly nut and a screw, and one end of the screw is rotatably attached to one of the upper cover and the lower cover through a pin.

[0009] According to another aspect of the utility model, the sealing body is tubular and has an inner cavity suitable for inserting the static pressure sensing tube, and the clamp body has a tubular accommodating cavity, and the sealing body is installed in the accommodating cavity.

[0010] According to another aspect of the utility model, the sealing body has a dividing groove extending along the axis of the tubular sealing body, and the dividing groove is configured so that the static pressure sensing tube can be installed into the inner cavity of the sealing body through the dividing groove.

[0011] According to another aspect of the utility model, when the upper cover and the upper cover are closed together, air flow communication is formed between the space at the communication portion and the air pipe joint.

[0012] According to another aspect of the utility model, the sealing body is cylindrical, and the accommodating cavity includes a semi-cylindrical first concave portion formed in the upper cover and a semi-cylindrical second concave portion formed in the lower cover.

[0013] According to another aspect of the utility model, the air pipe joint is detachably mounted on the upper cover.

[0014] By adopting the airtight test fixture according to the utility model, the air data calibration device and the drag cone static pressure sensing tube can be quickly and reliably connected, thereby realizing the transmission of air pressure from the air data calibration device to the drag cone system.

[0015] According to the utility model, the static pressure hole of the static pressure sensing tube is used as the air flow port of the drag cone system. When the air flow is connected to the connected atmospheric data calibration equipment, the air flow is only connected to the calibration equipment through the static pressure hole, the connecting part on the sealing body, and the air pipe joint to perform an airtight test. With this system, there is no need to reserve a specific three-way joint in the cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] For a more complete understanding of the present invention, reference may be made to the following description of exemplary embodiments considered in conjunction with the accompanying drawings, in which:

[0017] Figure 1 The figure shows an axial view of an airtight test fixture of a drag cone system according to a preferred embodiment of the utility model.

[0018] Figure 2 The figure shows a side view of an airtight test fixture of a drag cone system according to a preferred embodiment of the utility model.

[0019] Figure 3 The figure shows an axial view of the lower cover according to a preferred embodiment of the utility model.

[0020] Figure 4 The figure shows an axial view of an upper cover according to a preferred embodiment of the utility model.

[0021] Figure 5 The figure shows a front view of a sealing body equipped with a static pressure sensing tube according to a preferred embodiment of the utility model.

[0022] Figure 6 The figure shows an axial view of the sealing body and the static pressure sensing tube according to the utility model.

[0023] Reference numerals list

[0024] 10Airtight test fixture

[0025] 100 fixture body

[0026] 110 Upper cover

[0027] 112 connecting holes

[0028] 115 card slots

[0029] 120 lower cover

[0030] 131, 132 lugs

[0031] 150 quick lock nut assembly

[0032] 151 butterfly nut

[0033] 152 screw

[0034] 153 pin

[0035] 160 Accommodation Chamber

[0036] 170 Hinge Pin

[0037] 200 Sealed Body

[0038] 210 Inner cavity

[0039] 220 Connecting Department

[0040] 230 split slot

[0041] 300 air pipe connector

[0042] 20 Static pressure sensing tube

[0043] 21 Static pressure hole DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0045] Figure 1 is a stereogram of a drag cone system airtight test fixture 10 according to a preferred embodiment of the utility model, and Figure 2 1 is a side view of a cone drag system airtight test fixture 10 according to a preferred embodiment of the utility model. In the preferred embodiment, the cone drag system airtight test fixture 10 mainly includes a fixture body 100, an air pipe joint 300 and a sealing body 200. The fixture body 100 is formed with a receiving cavity 160, and the sealing body 200 is arranged in the receiving cavity 160. The static pressure sensing tube 20 (see FIG. 20 ) in the cone drag system Figure 6 ) is arranged in the inner cavity of the sealing body 200, so that the static pressure sensing tube 20 is kept airtight in the fixture 10, ensuring that the airflow of the static pressure hole 21 of the static pressure sensing tube 20 is connected to the atmospheric data calibration equipment through the air pipe joint 300 of the airtight test fixture 10 for airtight test.

[0046] In particular, if Figure 1 and 2 As shown, the fixture body 100 includes an upper cover 110 and a lower cover 120. The upper cover 110 (as shown in FIG. Figure 4 As shown) and the lower cover 120 (as Figure 3 The upper cover 110 and the lower cover 120 are matched together to form a receiving cavity 160 for receiving the static pressure sensing tube 20 of the drag cone system. The upper cover 110 and the lower cover 120 have substantially corresponding peripheral shapes. In a preferred embodiment, the two are substantially rectangular parallelepiped bodies, and the sides facing each other are both provided with concave parts, and the concave parts of the two cooperate with each other to form the receiving cavity 160.

[0047] In a preferred embodiment, the upper cover 110 is provided with a communication hole 112, which connects the accommodating cavity 160 of the fixture body 100 with the external calibration device. Preferably, the communication hole 112 is arranged at a substantially middle position of the upper cover 110, and the semi-cylindrical concave portion of the upper cover 110 is correspondingly extended along the middle position of the upper cover 110, so that one end of the communication hole 112 is open in the concave portion.

[0048] On the other hand, the lower cover 120 is different from the upper cover 110 in that the inner surface is non-porous, but is also provided with a semi-cylindrical concave portion. The concave portions of the upper cover 110 and the lower cover 120 form a cylindrical accommodating cavity 160 after the upper cover 110 and the lower cover 120 are matched together to accommodate the cylindrical sealing body 200. It should be understood that in other embodiments, other shapes of the accommodating cavity 160 may also be used, as long as the shape of the accommodating cavity 160 is substantially consistent with the shape of the sealing body 200.

[0049] Preferably, the upper cover 110 and the lower cover 120 are connected together by a hinge device. Specifically, the hinge device includes a pair of lugs 131, 132 and a hinge pin 170 integrally arranged on the same side of the upper cover 110 and the lower cover 120. Each lug has a hole. When the upper cover 110 and the lower cover 120 are assembled together, these holes are aligned, and the hinge pin 170 is rotatably inserted into these holes, so that the upper cover 110 and the lower cover 120 are relatively rotatably hinged together. By adopting the hinge device, it is more convenient for the tester to install the upper cover 110 and the lower cover 120.

[0050] On the other hand, a fastening device is provided on the other side of the upper cover 110 and the lower cover 120 , which is attached to one of the upper cover 110 and the lower cover 120 without being detached therefrom and can be manipulated to be fastened relative to the other of the upper cover 110 and the lower cover 120 .

[0051] like Figure 1 As shown, the fastening device of the preferred embodiment of the utility model adopts a quick-locking nut assembly 150. The quick-locking nut assembly 150 includes a butterfly nut 151 and a screw rod 152. One end of the bolt is rotatably mounted on the lower cover 120 through a pivot, specifically in a recess formed on the side of the lower cover 120. The butterfly nut 151 is threadedly connected to the other end. A slot 115 is provided at a corresponding position of the upper cover 110, and the width of the slot 115 is set to be suitable for engaging the screw rod 152, and the butterfly nut 151 is tightened on the upper surface of the upper cover 110. In order to cooperate with the locking of the butterfly nut 151, the upper surface of the upper cover 110 forms at least a partial flat surface on a portion surrounding the slot 115.

[0052] The number of quick-lock nut assemblies 150 depends on the shape and size of the clamp body 100. Figure 1 As shown, in a preferred embodiment, the clamp body 100 is provided with two quick-lock nut assemblies 150 .

[0053] It should be understood that other forms of quick-locking devices are also feasible. For example, a snap-on quick-locking device can be used. Specifically, the snap-on quick-locking device includes a snap-on member and a locking member, the snap-on member is provided on the upper cover 110, and the locking member is attached to the lower cover 120. When the upper cover 110 and the lower cover 120 are closed together, the locking member is snapped onto the snap-on member, and a fastening and locking is achieved. Regardless of the specific structure of the fastening device, it is important that the fastening device is attached to the fixture body 100 as an integral part, rather than the fastening device being discrete from the fixture body 100, which facilitates the installation operation of the experimenter.

[0054] like Figure 1 and Figure 6 As shown, the sealing body 200 is tubular, preferably cylindrical, and the sealing body 200 forms a cavity to receive the static pressure sensing tube 20. The length of the cylindrical sealing body 200 is substantially the same as or slightly shorter than the length of the clamp body 100, that is, the sealing body 200 does not extend beyond the clamp body.

[0055] The sealing body 200 is provided with a connecting portion 220. Figure 6 It can be clearly seen that the connecting portion 220 is preferably in the shape of an oblong hole, and the length of the oblong connecting portion 220 is slightly larger than the linear dimension of the static pressure holes 21 arranged in a straight line on the static pressure sensing tube 20. When the upper cover 110 is locked onto the lower cover, the sealing body 200 is squeezed between the outer surface of the static pressure sensing tube 20 and the inner surface of the clamp body 100, and the static pressure holes 21, the connecting portion 220 and the air pipe joint are in a connected state.

[0056] The sealing body 200 is also provided with a dividing groove 230. Preferably, the dividing groove 230 is arranged on the wall of the sealing body 200 diametrically opposite to the connecting portion 220, so that the cylindrical wall of the sealing body 200 is discontinuous. The dividing groove 230 extends from one end to the other end along the longitudinal axis of the tubular sealing body 200. The dividing groove 230 is configured so that the static pressure sensing tube 20 can be installed from the dividing groove 230 into the inner cavity 210 of the sealing body 200.

[0057] The use of the airtight test fixture 10 according to the present invention is as follows.

[0058] First, open the upper cover 110 and the lower cover 120 of the fixture body 100, take out the sealing body 200 from the accommodating cavity 160, and then insert the static pressure sensing tube 20 of the drag cone system into the inner cavity 210 of the sealing body 200 from the dividing groove 230, so that the position of the static pressure hole of the static pressure sensing tube 20 is aligned with the connecting portion 220 of the sealing body 200. Next, place the sealing body 200 with the static pressure sensing tube 20 installed in the accommodating cavity 160 of the lower cover 120, so that the connecting portion 220 of the sealing body 200 faces directly upward, and rotate the upper cover 110 to close the upper cover 110 and the lower cover 120. Subsequently, rotate the bolt of the quick-lock nut assembly 150 and insert it into the card slot 115 of the upper cover 110, and tighten the nut toward the surface of the upper cover 110, so as to complete the installation of the airtight test fixture 10 of the static pressure sensing tube 20. Finally, connect the joint to the atmospheric data calibration equipment to perform the airtight test.

[0059] After the air-tight test, disconnect and remove the atmospheric calibration equipment from the joint, then rotate the butterfly nut 151 to loosen the quick-lock nut assembly 150, then open the upper cover 110 and the lower cover 120, take out the sealing body 200 from the accommodating cavity 150, and then take out the static pressure sensing tube 20 from the sealing body 200. In this way, the drag cone system is restored to its initial state and is ready for subsequent subject test flights.

[0060] In an alternative embodiment, the sealing body can also be formed integrally with the clamp body, that is, the sealing body is non-detachable relative to the clamp body. For example, the sealing body includes an upper cover sealing body and a lower cover sealing body, the upper cover sealing body is arranged on the inner surface of the upper cover, and the lower cover body includes an inner surface arranged on the lower cover sealing body, so that when the upper cover and the lower cover are put together, the upper cover sealing body and the lower cover sealing body are joined to include a static pressure sensing tube, wherein a connecting portion connected to the airflow of the trachea joint is formed in the upper cover sealing body. When installing the clamp, the static pressure sensing tube is installed between the upper cover and the lower cover, the static pressure hole on the static pressure sensing tube is aligned with the connecting portion, and the upper cover and the lower cover are closed to complete the installation of the clamp.

[0061] By adopting the airtight test fixture 10 of the utility model, the existing step of sealing the static pressure hole 21 on the static pressure sensing tube 20 with tape is omitted. Instead, the static pressure hole 21 on the static pressure sensing tube 20 is used as a connection port for the drag cone system to the atmospheric data calibration equipment in the airtight test of the drag cone system, thereby realizing a fast and reliable connection between the atmospheric data calibration equipment and the drag cone system, and further realizing the transmission of air pressure from the atmospheric data calibration equipment to the drag cone system.

[0062] Although the utility model is disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope defined by the claims of the utility model.

Claims

1. A drag cone system airtight test fixture, characterized in that: include: A fixture body, the fixture body comprising an upper cover and a lower cover, the upper cover and the lower cover are attached to form a receiving cavity for receiving a static pressure sensing tube of the drag cone system; An air pipe joint, the air pipe joint being arranged on the clamp body to communicate gas with the accommodating cavity in the clamp body; as well as A sealing body is located between the upper cover and the lower cover and is arranged to at least partially surround the static pressure sensing tube. The sealing body has a connecting portion connected to the air flow of the air pipe joint.

2. The airtight test fixture for the drag cone system according to claim 1, characterized in that: The upper cover and the lower cover are connected together at their respective first sides by hinge devices, A fastening device for locking the upper cover and the lower cover together is provided on a second side of at least one of the upper cover and the lower cover opposite to the first side.

3. The airtight test fixture for the drag cone system according to claim 2, characterized in that: The fastening device includes a quick-lock device that is attached to one of the upper cover and the lower cover and can be locked to the other of the upper cover and the lower cover.

4. The airtight test fixture for the drag cone system according to claim 3, characterized in that: The quick-locking device comprises a quick-locking nut assembly, which comprises a butterfly nut and a screw rod, one end of which is rotatably attached to one of the upper cover and the lower cover through a pin shaft.

5. The airtight test fixture for the drag cone system according to claim 1, characterized in that: The sealing body is tubular and has an inner cavity suitable for inserting a static pressure sensing tube, and the clamp body has a tubular accommodating cavity, in which the sealing body is installed.

6. The airtight test fixture for the drag cone system according to claim 5, characterized in that: The sealing body has a dividing groove extending along the axis of the tubular sealing body, and the dividing groove is configured so that the static pressure sensing tube can be installed into the inner cavity of the sealing body through the dividing groove.

7. The airtight test fixture for the drag cone system according to claim 1, characterized in that: When the upper cover and the upper cover are closed together, air flow communication is formed between the space at the communication portion and the air pipe joint.

8. The airtight test fixture for the drag cone system according to claim 1, characterized in that: The sealing body is cylindrical, and the accommodating cavity includes a semi-cylindrical first concave portion formed in the upper cover and a semi-cylindrical second concave portion formed in the lower cover.

9. The airtight test fixture for the drag cone system according to claim 1, characterized in that: The air pipe joint is detachably mounted on the upper cover.

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