Rotor and positive displacement flowmeter including the same

Abstract

A rotor and a volumetric flowmeter including the same of the present invention relate to the field of fluid measurement technology, and the purpose is to provide a rotor and a volumetric flowmeter including the same that will not cause pressure build-up and will be conducted in time when the mechanical rotation is stuck. It includes: a main rotor and a secondary rotor, the main rotor meshing with the secondary rotor; the secondary rotor includes a rotor shaft and a rotor, the first end of the rotor is used to connect to the rotor shaft, and the first end of the rotor is provided with a pressure relief protection valve, and the pressure relief protection valve is used to form a fluid channel. The pressure relief protection valve is provided on the secondary rotor, and in the case of pressure build-up, when the pressure difference on both sides of the secondary rotor in a sealed state reaches the threshold of the pressure relief protection valve, the pressure relief protection valve will open, and the fluid will flow through the pressure relief protection valve, and the flow will be conducted in time without pressure build-up, thereby protecting the pipeline and the instrument and extending the service life of the flowmeter.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid measurement, and in particular to a rotor and a positive displacement flowmeter comprising the rotor. Background Art

[0002] The volumetric flowmeter uses the closed volume as the measuring cavity and measures by counting the number of measuring cavities. It includes spiral (double) rotor flowmeter, three-rotor flowmeter, metal scraper flowmeter, suspended rotor flowmeter, etc. However, the flowmeter in the prior art has the following technical problems: the mechanical rotation is easy to get stuck, and after getting stuck, the fluid is closed, and the pipeline is easy to be pressurized. Due to the continuous multiple exploitation of oil fields, many pipelines are aging, and environmental protection requirements are constantly increasing. Therefore, the pressure leakage of crude oil pipelines has become a red line, and there is an urgent need for high-precision but non-pressurized measuring instruments on site.

[0003] In view of this, this application is filed. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a rotor which will not accumulate pressure when the mechanical rotation is stuck and can be turned on in time, and a positive displacement flowmeter containing the same.

[0005] In a first aspect, the present invention provides a positive displacement flow meter rotor, comprising: a main rotor and a secondary rotor, the main rotor meshing with the secondary rotor;

[0006] The auxiliary rotor comprises a rotor shaft and a rotor, wherein the first end of the rotor is used to be connected to the rotor shaft, and the first end of the rotor is provided with a pressure relief protection valve, and the pressure relief protection valve is used to form a fluid channel.

[0007] Furthermore, the pressure relief protection valve is a spring travel switch, and the spring travel switch is arranged between the rotor shaft and the rotor, and the spring travel switch comprises: a steel ring, a spring and a conical plug,

[0008] One side of the steel ring is fixedly connected to the rotor shaft, and the other side of the steel ring is fixedly connected to the rotor; the conical plug is embedded between the rotor shaft and the rotor from the small head end; the steel ring and the conical plug are arranged in parallel, and the spring is arranged between the steel ring and the conical plug.

[0009] Furthermore, the spring travel switch also includes: a spring seat, and the spring is fixedly connected to the conical plug via the spring seat.

[0010] Furthermore, the pressure relief protection valve is a uniaxial rotating flat plate sealed switch, and the uniaxial rotating flat plate sealed switch comprises: a sealing baffle, a uniaxial shaft, a tension spring and a base.

[0011] The first side of the base is fixedly connected to the rotor shaft, and the second side of the base is fixedly connected to the rotor; the first side of the sealing baffle is rotatably connected to the rotor shaft through the single shaft, and the second side of the sealing baffle is in contact with the rotor;

[0012] The base is arranged in parallel with the sealing baffle, and the tension spring is arranged between the second side of the base and the second side of the sealing baffle.

[0013] Furthermore, the base is a conical base, and the conical base is embedded between the rotor shaft and the rotor through the small head end.

[0014] Furthermore, it also includes a rotation spring, which is arranged at the single shaft, one end of the rotation spring is fixed to the sealing baffle, and the other end of the rotation spring is fixed to the rotor shaft.

[0015] In a second aspect, the present invention provides a volumetric flowmeter, characterized in that it comprises a volumetric flowmeter rotor as described in any one of the above items.

[0016] In a third aspect, the present invention provides a control method for a volumetric flow meter, comprising:

[0017] When the rotor fails and gets stuck, the pressure difference on both sides of the auxiliary rotor in a sealed state reaches the threshold of the pressure relief protection valve, the pressure relief protection valve opens, and the fluid flows through the pressure relief protection valve.

[0018] Furthermore, when the rotor fails and gets stuck, the pressure difference on both sides of the auxiliary rotor in a sealed state reaches the threshold of the spring, the conical plug is pushed open, and the fluid flows through the conical plug.

[0019] Furthermore, when the rotor fails and gets stuck, the pressure difference on both sides of the auxiliary rotor in a sealed state reaches the threshold of the tension spring, the second side of the sealing baffle is pushed open, the first side of the sealing baffle rotates along the single axis, and the fluid flows through the sealing baffle.

[0020] The rotor and the volumetric flowmeter including the rotor provided by the present invention provide a pressure relief protection valve on the rotor of the auxiliary rotor, so that the fluid is conducted in time. The volumetric flowmeter is prone to jamming during mechanical rotation, and at least one auxiliary rotor will be in a sealed state, resulting in fluid closure and easy pressure buildup in the pipeline; the pressure relief protection valve is provided on the auxiliary rotor, and in the case of pressure buildup, when the pressure difference on both sides of the auxiliary rotor in a sealed state reaches the threshold of the pressure relief protection valve, the pressure relief protection valve will open, and the fluid will flow through the pressure relief protection valve, and the flow will be guided in time without pressure buildup, thus protecting the pipeline and the instrument and extending the service life of the flowmeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0022] Figure 1 A schematic diagram of a working state of a positive displacement flow meter provided by an embodiment of the present invention;

[0023] Figure 2 A second schematic diagram of a working state of a positive displacement flow meter provided by an embodiment of the present invention;

[0024] Figure 3 Three schematic diagrams of the working state of a positive displacement flow meter provided by an embodiment of the present invention;

[0025] Figure 4 Four schematic diagrams of the working state of a positive displacement flow meter provided by an embodiment of the present invention;

[0026] Figure 5 A schematic diagram of the auxiliary rotor structure of a positive displacement flowmeter provided by an embodiment of the present invention;

[0027] Figure 6 for Figure 5 A top view of

[0028] Figure 7 A schematic diagram of the structure of a spring travel switch provided by an embodiment of the present invention;

[0029] Figure 8 for Figure 7 A top view of

[0030] Fig. 9 A schematic diagram of the auxiliary rotor structure of a positive displacement flowmeter provided by another embodiment of the present invention;

[0031] Fig.10 for Fig. 9 A top view of

[0032] Fig.11 An exploded view of a portion of the structure of a single-axis rotating flat sealed switch provided by an embodiment of the present invention;

[0033] Reference numerals:

[0034] 1-Main rotor

[0035] 2-Auxiliary rotor

[0036] 21-Rotor shaft

[0037] 22-Rotator

[0038] 3-Pressure relief valve

[0039] 31-Spring travel switch

[0040] 311-Steel Ring

[0041] 312-Spring

[0042] 313-conical plug

[0043] 314-Spring seat

[0044] 32-axis rotary plate sealed switch

[0045] 321-Sealing baffle

[0046] 322-Single Axis

[0047] 323-Extension spring

[0048] 324-conical base

[0049] 325-Rotation spring DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be described in detail below in conjunction with specific embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention.

[0051] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0052] In the first aspect, a positive displacement flowmeter rotor provided by an embodiment of the present invention comprises: a main rotor 1 and a secondary rotor 2, wherein the main rotor 1 is meshed with the secondary rotor 2; the secondary rotor 2 comprises a rotor shaft 21 and a rotor 22, wherein the first end of the rotor 22 is used to be connected to the rotor shaft 21, and the first end of the rotor 22 is provided with a pressure relief protection valve 3, wherein the pressure relief protection valve 3 is used to form a fluid channel. The provision of the pressure relief protection valve 3 can prevent the pressure build-up caused by the rotor being stuck and the fluid being closed, effectively guide the flow, and protect the instrument.

[0053] like Figure 5-8As shown, the rotor of the volumetric flowmeter provided by an embodiment of the present invention, the pressure relief protection valve 3 is a spring travel switch 31, the spring travel switch 31 is arranged between the rotor shaft 21 and the rotor 22, and the spring travel switch 31 includes: a steel ring 311, a spring 312 and a conical plug 313, one side of the steel ring 311 is fixedly connected to the rotor shaft 21, and the other side of the steel ring 311 is fixedly connected to the rotor 22; the conical plug 313 is embedded between the rotor shaft 21 and the rotor 22 by the small head end; the steel ring 311 and the conical plug 313 are arranged in parallel, and the spring 312 is arranged between the steel ring 311 and the conical plug 313. The elastic force threshold of the spring 312 is set to: the pressure loss value at 1.2 times the maximum flow rate of the flowmeter in normal working state. When the pressure difference on both sides of the spring travel switch 31 reaches the threshold of the spring 312, the conical plug 313 will pop out, and a fluid channel will be formed between the conical plug 313 and the rotor to facilitate the flow of fluid and prevent pressure build-up in instruments and pipelines.

[0054] In order to facilitate fixing the spring 312, the volumetric flowmeter rotor provided in one embodiment of the present invention, the spring travel switch 31 further includes: a spring seat 314, and the spring 312 is fixedly connected to the conical plug 313 through the spring seat 314. The spring seat 314 is used for fixing, which is more stable and prevents the spring 312 from being separated from the conical plug 313 under the action of external force.

[0055] In one embodiment of the present invention, Figure 1-4 As shown in the figure, the working state of the three-rotor positive displacement flowmeter is listed. The rotor of the three-rotor is relatively thin. If the position of the spring 312 needs to be adjusted, it can be adjusted by increasing the diameter of the steel ring 311; if it is a double-rotor flowmeter, the position of the spring 312 can be adjusted by adjusting the thickness of the rotor. Adjusting the position of the spring 312 means adjusting its deformation range to a certain extent. The spring travel switch 31 adopts a lifting mode, and the rise or fall of the conical plug 313 corresponds to the opening or closing of the switch.

[0056] like Figure 9-11As shown, the rotor of the volumetric flowmeter provided by another embodiment of the present invention, the pressure relief protection valve 3 is a single-axis 322 rotating flat plate sealed switch 32, and the single-axis 322 rotating flat plate sealed switch 32 includes: a sealing baffle 321, a single axis 322, a tension spring 323 and a base, the first side of the base is fixedly connected to the rotor shaft 21, and the second side of the base is fixedly connected to the rotor 22; the first side of the sealing baffle 321 is rotatably connected to the rotor shaft 21 through the single axis 322, and the second side of the sealing baffle 321 is in contact with the rotor 22; the base is arranged in parallel with the sealing baffle 321, and the tension spring 323 is arranged between the second side of the base and the second side of the sealing baffle 321. The elastic force threshold of the tension spring 323 is set to: the pressure loss value at 1.2 times the maximum flow rate of the flowmeter in normal working state. When the pressure difference on both sides of the single-axis 322 rotating flat sealing switch 32 reaches the threshold of the tension spring 323, the spring 312 will bounce the second side of the sealing baffle 321 and the second side of the sealing baffle 321 will rotate around the single-axis 322, so that the sealing baffle 321 is separated from the rotor 22 to form a fluid channel.

[0057] Preferably, in the volumetric flowmeter rotor provided by an embodiment of the present invention, the base is a conical base 324, and the conical base 324 is embedded between the rotor shaft 21 and the rotor 22 from the small end, so that the fit is tight and stable.

[0058] In order to cooperate with the opening of the sealing baffle 321, the positive displacement flow meter rotor provided in an embodiment of the present invention further includes a rotation spring 325, which is arranged at the single shaft 322, one end of the rotation spring 325 is fixed to the sealing baffle 321, and the other end of the rotation spring 325 is fixed to the rotor shaft 21. The arrangement of the rotation spring 325 can facilitate the sealing baffle 321 to rotate around the single shaft 322 under the elastic force, which has a better effect than relying only on the elastic force of the tension spring 323, and can also effectively protect the tension spring 323 and improve its service life.

[0059] In other embodiments of the present application, the setting of elastic force or magnetic force: first, let the instrument work normally, test the pressure loss of the instrument when the flow rate is 1.2 times the maximum value, and this differential pressure is the initial value of the switch valve. The pressure relief protection valve 3 has unidirectional conductivity, and the conduction threshold can be adjusted by adjusting the elasticity of the spring 312. When it is greater than the threshold, the fluid is conductive, otherwise it is closed; when closed, the sealing performance is good, which can effectively reduce the leakage, and the pressure relief protection valve 3 is easy to install and has a long service life.

[0060] like Figure 1-4 As shown, the working cycle of the three rotors is shown in sequence. When the rotor is stuck, the auxiliary rotor 2 ( Figure 1 , 3The two auxiliary rotors 2 are sealed. Figure 2 , 4 As the pressure difference between the front and rear sides of a single auxiliary rotor 2 seal increases, the fluid will push open the conical plug 313 (moving up and down) or the sealing plate (rotating around the single axis 322) to form a fluid channel, ensuring that the fluid can flow normally under any conditions.

[0061] It is worth emphasizing that other volumetric flow meters can also design protection valves based on the technical features disclosed in this application in combination with specific forms, but variations based on this application should also be within the scope of protection of this application.

[0062] In a second aspect, a volumetric flowmeter provided by an embodiment of the present invention is characterized in that it includes a volumetric flowmeter rotor as described in any one of the above items.

[0063] In a third aspect, a control method for a volumetric flowmeter provided by an embodiment of the present invention includes: when the fluid passes through the volumetric flowmeter, the rotor rotates normally; when the rotor fails and gets stuck, the pressure difference on both sides of the auxiliary rotor 2 in a sealed state reaches the threshold of the pressure relief protection valve 3, the pressure relief protection valve 3 opens, and the fluid flows through the pressure relief protection valve 3.

[0064] Another embodiment of the present invention provides a control method for a volumetric flowmeter, in which a rotor fails and gets stuck, and the pressure difference on both sides of the auxiliary rotor 2 in a sealed state reaches the threshold of the spring 312, the conical plug 313 is pushed open, and the fluid flows through the conical plug 313.

[0065] Another embodiment of the present invention provides a control method for a volumetric flowmeter, in which a rotor fails and gets stuck, and the pressure difference on both sides of the auxiliary rotor 2 in a sealed state reaches the threshold of the tension spring 323, the second side of the sealing baffle 321 is pushed open, and the first side of the sealing baffle 321 rotates along the single axis 322, and the fluid flows through the sealing baffle 321.

[0066] The rotor and the volumetric flowmeter including the rotor provided by the present invention provide a pressure relief protection valve 3 on the rotor 22 of the auxiliary rotor 2, so that the fluid is conducted in time. The volumetric flowmeter is prone to jamming during mechanical rotation, and at least one auxiliary rotor 2 will be in a sealed state, resulting in fluid closure and easy pressure buildup in the pipeline; the pressure relief protection valve 3 is provided on the auxiliary rotor 2, and when the pressure difference on both sides of the auxiliary rotor 2 in a sealed state reaches the threshold of the pressure relief protection valve 3, the pressure relief protection valve 3 will open, and the fluid will flow through the pressure relief protection valve 3, so that the fluid will be guided in time without pressure buildup, thus protecting the pipeline and the instrument and extending the service life of the flowmeter.

[0067] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0068] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0069] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0070] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present application, 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”, and “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”, and “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.

[0072] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0073] 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 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.

[0074] 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 replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A positive displacement flow meter rotor, characterized in that: include: a main rotor and a secondary rotor, the main rotor meshing with the secondary rotor; The auxiliary rotor comprises a rotor shaft and a rotor, wherein the first end of the rotor is used to be connected to the rotor shaft, and the first end of the rotor is provided with a pressure relief protection valve, and the pressure relief protection valve is used to form a fluid channel; The pressure relief protection valve is a spring travel switch or a uniaxial rotating flat plate sealing switch; When the pressure relief protection valve is a spring travel switch, the spring travel switch is arranged between the rotor shaft and the rotor, and the spring travel switch comprises: a steel ring, a spring and a conical plug, one side of the steel ring is fixedly connected to the rotor shaft, and the other side of the steel ring is fixedly connected to the rotor; the conical plug is embedded between the rotor shaft and the rotor by the small head end; the steel ring is arranged in parallel with the conical plug, and the spring is arranged between the steel ring and the conical plug; the spring travel switch also comprises: a spring seat, and the spring is fixedly connected to the conical plug through the spring seat; When the pressure relief protection valve is a single-axis rotating flat-plate sealed switch, the single-axis rotating flat-plate sealed switch includes: a sealing baffle, a single axis, a tension spring and a base, wherein the first side of the base is fixedly connected to the rotor shaft, and the second side of the base is fixedly connected to the rotor; the first side of the sealing baffle is rotatably connected to the rotor shaft through the single axis, and the second side of the sealing baffle is in contact with the rotor; the base is arranged in parallel with the sealing baffle, and the tension spring is arranged between the second side of the base and the second side of the sealing baffle; the base is a conical base, and the conical base is embedded between the rotor shaft and the rotor by the small head end; and it also includes a rotation spring, which is arranged at the single axis, one end of the rotation spring is fixed to the sealing baffle, and the other end of the rotation spring is fixed to the rotor shaft.

2. A volumetric flow meter, characterized in that: It comprises the volumetric flow meter rotor as described in claim 1.

3. A method for controlling a volumetric flowmeter according to claim 2, characterized in that: include: When the rotor fails and gets stuck, the pressure difference on both sides of the auxiliary rotor in a sealed state reaches the threshold of the pressure relief protection valve, the pressure relief protection valve opens, and the fluid flows through the pressure relief protection valve.

4. A method for controlling a volumetric flowmeter according to claim 3, characterized in that: When the rotor fails and gets stuck, the pressure difference on both sides of the auxiliary rotor in a sealed state reaches the threshold of the spring, the conical plug is pushed open, and the fluid flows through the conical plug.

5. The control method of a volumetric flowmeter according to claim 3, characterized in that: When the rotor fails and gets stuck, the pressure difference on both sides of the auxiliary rotor in a sealed state reaches the threshold of the tension spring, the second side of the sealing baffle is pushed open, the first side of the sealing baffle rotates along the single axis, and the fluid flows through the sealing baffle.

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