Ultralow-temperature throttling device

Abstract

The utility model is applicable to the technical field of throttling devices, and provides an ultralow-temperature throttling device which comprises two straight pipe sections and a throttling orifice plate arranged between the two straight pipe sections, a plurality of fastening screws used for fixing are arranged between the two straight pipe sections, an electric heating wire is embedded in the surface of one side, located in the straight pipe sections, of the throttling orifice plate, and the other side of the throttling orifice plate is provided with an air inlet and an air outlet. The electric heating wire is arranged in the upstream direction of the throttling device, an anti-blocking structure is arranged on the throttling orifice plate and comprises a plurality of impact blocks, the impact blocks are arranged in a throttling opening of the throttling orifice plate in a circumferential array mode, and a plurality of contraction grooves matched with the impact blocks are formed in the inner wall of the throttling opening of the throttling orifice plate. According to the throttling device, the problem that the throttling orifice is blocked due to the fact that fluid ice crystals are accumulated at the throttling orifice of the throttling orifice is solved, and meanwhile, due to the fact that the electric heating wire only heats the local part, the problem that the measurement accuracy of the throttling device is affected due to fluid vaporization caused by overall temperature rise is solved as much as possible.

Description

TECHNICAL FIELD

[0001] The utility model relates to throttling device technical field more specifically, it relates to a kind of super low temperature throttling device. BACKGROUND

[0002] Throttling device is in the fluid that fills pipeline and flows through one kind of flow device in pipeline, and flow beam will form local contraction at throttling, so as to make flow velocity increase, static pressure reduce, and static pressure difference is generated before and after throttling piece.

[0003] The existing throttling device is generally used in outdoor environment, and it is unavoidable to encounter super low temperature environment, when conveying fluid in super low temperature environment, ice crystal is generated in fluid, since the existing throttling device is used to test static pressure difference after fluid passes through throttling port, ice crystal in fluid is blocked in throttling orifice, and it is accumulated at throttling port, if not handled in time, it can cause ice crystal to be more and more accumulated in throttling orifice, finally, throttling orifice inner wall is frozen to cause the condition of blockage, so it affects the measurement accuracy of throttling device in super low temperature environment. SUMMARY

[0004] In view of the deficiencies in the prior art, the utility model aims at providing a kind of super low temperature throttling device for preventing ice crystal in fluid from being accumulated in throttling orifice of throttling orifice plate, to cause throttling orifice plate to be blocked.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of super low temperature throttling device, including two straight pipe sections and the throttling orifice plate being arranged between two straight pipe sections, multiple fastening screws for being fixed are arranged between two straight pipe sections, electric heating wire is embedded on the one side surface of the throttling orifice plate in straight pipe section, electric heating wire is arranged in the upstream direction of throttling device, anti-blocking structure is arranged on throttling orifice plate, anti-blocking structure includes multiple impact blocks, multiple impact blocks are arranged in throttling orifice of throttling orifice plate in the form of circumferential array, multiple shrinkage grooves that coincide with impact block are opened on the inner wall of throttling orifice of throttling orifice plate, driving mechanism for controlling the displacement of impact block is arranged on throttling orifice plate.

[0007] The utility model is further provided as follows: the driving mechanism includes heat preservation shell, the heat preservation shell is arranged on the outer surface of throttling orifice plate, electric push rod is arranged in heat preservation shell, annular cavity is opened in throttling orifice plate, one end of electric push rod telescopic rod is slidably penetrated into annular cavity.

[0008] The utility model is further provided as follows: the one side surface of impact block towards annular cavity is provided with push rod, the other end of push rod is slidably penetrated into annular cavity, contact head is arranged at the end of push rod in annular cavity, spring is arranged between contact head and annular cavity inner wall and is movably sleeved on the outer surface of push rod.

[0009] The utility model further sets up: annular inner chamber is provided with ring extrusion piece, the vertical section of ring extrusion piece is right trapezoid, and the inclined surface of ring extrusion piece contacts with the outer surface of contact head, and the inner wall between the left and right sides of annular inner chamber is provided with limiting rod, and the outer surface of ring extrusion piece is provided with the sleeve block, and the sleeve block is slidably arranged on the outer surface of limiting rod.

[0010] The utility model further sets up: electric push rod telescopic link is hinged with control rotation board between one end in annular inner chamber and the outer surface of sleeve block.

[0011] The utility model has the advantages of:

[0012] The utility model prevents fluid ice crystals from accumulating at the throttling orifice of the throttling orifice plate, which causes the throttling orifice plate to be blocked. At the same time, since the electric heating wire only heats a local area, the overall temperature rise is avoided as much as possible to prevent the fluid from vaporizing and affecting the measurement accuracy of the throttling device. In addition, the anti-blocking structure can break the ice crystals on the inner wall of the throttling orifice of the throttling orifice plate, preventing the inner wall of the throttling orifice of the throttling orifice plate from freezing and affecting the measurement accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 It is a structural schematic view of the ultra-low temperature throttling device of the utility model;

[0014] Fig. 2 It is a connection structure schematic view of the throttling orifice plate of the utility model;

[0015] Fig. 3 It is a partial front view of the throttling orifice plate of the utility model.

[0016] In the figure: 1, straight pipe section; 2, throttling orifice plate; 3, fastening screw; 4, test pipe; 5, measuring meter; 6, annular insert block; 7, electric heating wire; 8, anti-blocking structure; 81, impact block; 82, contraction groove; 83, annular inner chamber; 84, push rod; 85, contact head; 86, spring; 87, ring extrusion piece; 88, limiting rod; 89, sleeve block; 810, heat preservation shell; 811, electric push rod; 812, control rotation plate. DETAILED DESCRIPTION

[0017] The application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described are only used to explain the related utility model, and not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description.

[0018] It should be noted that the examples in the present application and the features in the examples can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and examples.

[0019] Referring to Figs. 1-3 The utility model provides the following technical scheme:

[0020] Specifically refers to a kind of super low temperature throttling device, including two straight pipe sections 1 and being arranged between two straight pipe sections 1 throttling orifice plate 2, between two straight pipe sections 1 is provided with a plurality of fastening screw 3 for fixed, when using, by throttling orifice plate 2 installation between two straight pipe sections 1, when by screwing fastening screw 3, throttling orifice plate 2 is fixed between two straight pipe sections 1.

[0021] Throttling orifice plate 2's left and right two side surfaces are all provided with annular insert block 6, and the side surface of straight pipe section 1 towards annular insert block 6 is provided with annular insert groove adapted with annular insert block 6, throttling orifice plate 2 is installed, and annular insert block 6 is clamped into annular insert groove, so that the outer surface of throttling orifice plate 2 is aligned with the outer surface of straight pipe section 1, prevent the problem that throttling orifice plate 2 appears deviation, also increase the sealing between throttling orifice plate 2 and straight pipe section 1.

[0022] The upper surface of two straight pipe sections 1 is provided with two test tubes 4, and the upper end of two test tubes 4 is provided with measuring meter 5 for measurement, so that the static pressure difference generated on the two sides of throttling orifice plate 2 can be measured.

[0023] Throttling orifice plate 2 is inlaid with electric heating wire 7 on one side surface in straight pipe section 1, and electric heating wire 7 is arranged in the upstream direction of throttling device, when the throttling device is used in super low temperature environment, to prevent ice crystal from appearing at throttling orifice position of throttling orifice plate 2, electric heating wire 7 is started, and only local heating is carried out on throttling orifice, and the power of electric heating wire 7 is not greater than 10W, so that fluid ice crystal is prevented from accumulating at throttling orifice of throttling orifice plate 2, to cause the problem that throttling orifice plate 2 is blocked, and since electric heating wire 7 only carries out local heating, whole temperature rise is avoided as much as possible to cause fluid vaporization, to affect the measurement accuracy of throttling device.

[0024] The anti-blocking structure 8 is arranged on the throttle orifice plate 2, and the anti-blocking structure 8 comprises a plurality of impact blocks 81 arranged in a circumferential array in the throttle orifice of the throttle orifice plate 2. A plurality of contraction grooves 82 that are matched with the impact blocks 81 are arranged on the inner wall of the throttle orifice of the throttle orifice plate 2. An annular inner cavity 83 is arranged in the throttle orifice plate 2. A push rod 84 is arranged on the side surface of the impact block 81 that faces the annular inner cavity 83. The other end of the push rod 84 is slidably penetrated into the annular inner cavity 83. A contact head 85 is arranged at the end of the push rod 84 in the annular inner cavity 83. A spring 86 is arranged between the contact head 85 and the inner wall of the annular inner cavity 83 and is movably sleeved on the outer surface of the push rod 84. When the spring 86 is not compressed, the spring 86 generates a pushing force on the contact head 85, so that the initial position of the contact head 85 is away from the side of the throttle orifice of the throttle orifice plate 2. At this time, the push rod 84 pulls the impact block 81 to contract into the contraction groove 82, and the inner side surface of the impact block 81 is matched with the inner wall of the throttle orifice of the throttle orifice plate 2. Therefore, when the throttle device is normally used, the impact block 81 does not block the fluid flow and does not affect the test precision.

[0025] An annular extrusion block 87 is arranged in the annular inner cavity 83. The vertical section of the annular extrusion block 87 is a right-angled trapezoid, and the inclined surface of the annular extrusion block 87 is in contact with the outer surface of the contact head 85. A limiting rod 88 is arranged between the left and right inner walls of the annular inner cavity 83. The outer surface of the annular extrusion block 87 is provided with a sleeving block 89, which is slidably sleeved on the outer surface of the limiting rod 88. In use, the sleeving block 89 is controlled to slide on the limiting rod 88, so that the annular extrusion block 87 is synchronously displaced. Therefore, the inclined surface of the annular extrusion block 87 extrudes the contact head 85, so that the push rod 84 pushes the impact block 81 to displace out of the contraction groove 82. When the inner wall of the throttle orifice of the throttle orifice plate 2 is frozen, the displaced impact block 81 can break the ice crystals, thereby preventing the frozen inner wall of the throttle orifice of the throttle orifice plate 2 from affecting the measurement precision.

[0026] The outer surface of the throttle orifice plate 2 is provided with a heat preservation shell 810 made of heat preservation material (such as heat preservation cotton). An electric push rod 811 is arranged in the heat preservation shell 810. One end of the telescopic rod of the electric push rod 811 is slidably penetrated into the annular inner cavity 83. A control rotating plate 812 is hinged between the end of the telescopic rod of the electric push rod 811 in the annular inner cavity 83 and the outer surface of the sleeving block 89. When it is necessary to break the ice layer in the throttle orifice of the throttle orifice plate 2, the electric push rod 811 is started, and the telescopic rod of the electric push rod 811 is displaced back and forth. At this time, the control rotating plate 812 controls the sleeving block 89 to slide back and forth on the limiting rod 88, so as to control the displacement of the impact block 81 out of or into the contraction groove 82.

[0027] In order to improve the use effect of the electric push rod 811 in a low temperature environment, heating wires can be additionally arranged in the heat preservation shell 810, so as to ensure that the electric push rod 811 can be normally used in a low temperature environment.

[0028] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An ultra-low temperature throttling device, comprising two straight pipe sections (1) and a throttling orifice plate (2) arranged between the two straight pipe sections (1), a plurality of fastening screws (3) for fixation being arranged between the two straight pipe sections (1), characterized in that: The throttle orifice plate (2) is embedded with an electric heating wire (7) on one side surface of a straight pipe section (1), the electric heating wire (7) is arranged in the upstream direction of the throttling device, the throttle orifice plate (2) is provided with an anti-blocking structure (8), the anti-blocking structure (8) comprises a plurality of impact blocks (81), the plurality of impact blocks (81) are arranged in a circumferential array in the throttle orifice of the throttle orifice plate (2), a plurality of contraction grooves (82) matched with the impact blocks (81) are arranged on the inner wall of the throttle orifice of the throttle orifice plate (2), and the throttle orifice plate (2) is provided with a driving mechanism for controlling the displacement of the impact blocks (81).

2. The ultra-low temperature throttling device of claim 1, wherein: The driving mechanism comprises a heat preservation shell (810) arranged on the outer surface of the throttle orifice plate (2), and an electric push rod (811) arranged in the heat preservation shell (810), wherein an annular cavity (83) is arranged in the throttle orifice plate (2), and one end of the telescopic rod of the electric push rod (811) slidably penetrates into the annular cavity (83).

3. The ultra-low temperature throttling device of claim 2, wherein: A push rod (84) is arranged on one side surface of the impact block (81) facing the annular cavity (83), the other end of the push rod (84) slidably penetrates into the annular cavity (83), one end of the push rod (84) located in the annular cavity (83) is provided with a contact head (85), and a spring (86) movably sleeved on the outer surface of the push rod (84) is arranged between the contact head (85) and the inner wall of the annular cavity (83).

4. The ultra-low-temperature throttling device according to claim 3, characterized in that: A ring-shaped extrusion block (87) is arranged in the annular cavity (83), the vertical section of the ring-shaped extrusion block (87) is a right-angled trapezoid, the inclined surface of the ring-shaped extrusion block (87) is in contact with the outer surface of the contact head (85), a limiting rod (88) is arranged between the left and right inner walls of the annular cavity (83), the outer surface of the ring-shaped extrusion block (87) is provided with a sleeving block (89), and the sleeving block (89) is slidably sleeved on the outer surface of the limiting rod (88).

5. The ultra-low temperature throttling device of claim 4, wherein: A control rotating plate (812) is hinged between one end of the telescopic rod of the electric push rod (811) located in the annular cavity (83) and the outer surface of the sleeving block (89).

6. The ultra-low temperature throttling device of claim 1, wherein: The upper surfaces of the two straight pipe sections (1) are provided with two test tubes (4), and the upper ends of the two test tubes (4) are provided with measuring meters (5) for measurement.

7. The ultra-low-temperature throttling device according to claim 1, characterized in that: The left and right side surfaces of the throttle orifice plate (2) are both provided with annular embedding blocks (6), and the side surface of the straight pipe section (1) facing the annular embedding blocks (6) is provided with annular embedding grooves matched with the annular embedding blocks (6).

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