Gear type flowmeter with non-return mechanism

Abstract

The gear type flowmeter comprises a shell, a liquid inlet end pipe, a liquid outlet end pipe, a first gear, a second gear, the non-return mechanism and a flowmeter, a containing cavity is formed in the shell, the liquid inlet end pipe is arranged at the top of the shell, the liquid outlet end pipe is arranged at the bottom of the shell, and the liquid inlet end pipe and the liquid outlet end pipe both communicate with the containing cavity; the non-return mechanism is arranged in the shell and used for preventing the medium from driving the first gear and / or the second gear to rotate when the medium flows back. The flow measuring device has the technical effects that a gear meshing structure is adopted, and a more accurate corresponding relation is established between gear rotation and medium flow, so that the flow measuring precision is improved; by arranging the non-return mechanism, medium backflow can be effectively prevented, the system safety is protected, and the fault risk is reduced; the functions of the non-return mechanism and the flowmeter are integrally designed, the number of system components can be reduced, the installation cost is reduced, and the overall performance and efficiency of the system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid flow measurement, and particularly relates to a gear flowmeter with a check mechanism. Background Art

[0002] The gear flowmeter is a common volumetric flowmeter, which is widely used in industries such as petroleum, chemical, food, and medicine. Its working principle is that two meshing gears rotate under the action of the fluid, and the number of rotations of the gears is proportional to the volume of the fluid, thereby realizing the measurement of the flow rate. The gear flowmeter has the advantages of high accuracy, good repeatability, and wide application range. However, the traditional gear flowmeter usually has a relatively complex structure, and there is a problem of liquid backflow in its actual application: in some application scenarios, such as in a pumping system or a pipeline system, the liquid may generate a backflow phenomenon due to pressure changes or the stop of the pump. The liquid backflow will not only affect the measurement accuracy of the flowmeter, but may also cause equipment damage or system failure. In the prior art, in order to prevent the backflow phenomenon, a check valve needs to be separately installed on the pipeline, which increases the complexity and cost of the system. Summary of the Invention

[0003] Therefore, the present invention provides a gear flowmeter with a check mechanism to solve the above problems in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] According to a first aspect of the present invention, a gear flowmeter with a check mechanism includes a housing, an inlet pipe, an outlet pipe, a first gear, a second gear, a check mechanism, and a flow meter. A receiving cavity is provided in the housing. The inlet pipe is arranged at the top of the housing, and the outlet pipe is arranged at the bottom of the housing. Both the inlet pipe and the outlet pipe communicate with the receiving cavity.

[0006] Both the first gear and the second gear are rotatably arranged in the receiving cavity, and the first gear and the second gear mesh with each other.

[0007] The flow meter is arranged outside the housing, and one end of the rotating shaft of the second gear penetrates through the housing and extends into the flow meter.

[0008] The check mechanism is arranged in the housing, and the check mechanism is used to prevent the first gear and / or the second gear from rotating when the medium flows back.

[0009] Further, the check mechanism includes a check rod, a check spring and a stop rod, the check rod is arranged on the side of the second gear away from the first gear, the check rod is arranged obliquely, the bottom end of the check rod is rotatably connected to the housing, and the top end of the check rod is placed on the tooth portion of the second gear;

[0010] The check spring is vertically arranged, the bottom end of the check spring is connected to the housing, and the top end of the check spring is connected to the check rod;

[0011] The blocking rod is arranged on a side of the check rod close to the second gear, and the blocking rod abuts against the check rod.

[0012] Furthermore, it also includes a sealing cover, which is arranged on the shell, the sealing cover and the shell together form a sealing structure, and the flow meter is arranged on the sealing cover.

[0013] Furthermore, the sealing cover is detachably connected to the shell, and a sealing ring is provided between the sealing cover and the shell.

[0014] Furthermore, the first gear and the second gear are both detachably arranged in the accommodating cavity.

[0015] Furthermore, the liquid inlet end tube, the liquid outlet end tube and the shell are an integrated structure.

[0016] Furthermore, a conical transition section is provided at the connection between the liquid inlet end tube and the liquid outlet end tube and the shell.

[0017] Furthermore, the liquid inlet end tube and the liquid outlet end tube are both cylindrical, and the liquid inlet end tube and the liquid outlet end tube are coaxially arranged.

[0018] Furthermore, the first gear and the second gear are of the same size, and the first gear and the second gear are symmetrically arranged along the axis of the liquid inlet end tube.

[0019] Furthermore, the shell, the liquid inlet end tube, the liquid outlet end tube, the first gear and the second gear are all made of PE material.

[0020] The present invention has the following advantages: by adopting a gear meshing structure, a more accurate correspondence is established between gear rotation and medium flow, thereby improving the accuracy of flow measurement and providing reliable data support for the precise control of the fluid conveying system; by setting a check mechanism, the medium can be effectively prevented from flowing back, the system safety can be protected, and the risk of failure can be reduced. While effectively preventing the medium from flowing back, the obstruction to the flow of the medium can be minimized, the pressure loss can be reduced, the operating efficiency of the entire fluid conveying system can be improved, and energy consumption can be saved; the check mechanism and the flow meter are designed to be integrated into one function, which can reduce the number of system components, reduce installation costs, and improve the overall performance and efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the implementation of the present invention or the technical solution in the prior art, the following briefly introduces the drawings required for the implementation or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0022] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0023] Figure 1 A first perspective view of a gear flow meter with a check mechanism provided for some embodiments of the present invention.

[0024] Figure 2 A second perspective view of a gear flow meter with a check mechanism provided in accordance with some embodiments of the present invention.

[0025] Figure 3 A schematic diagram of the internal structure of a gear-type flowmeter with a check mechanism provided in some embodiments of the present invention.

[0026] In the figure: 1, shell, 2, liquid outlet pipe, 3, liquid inlet pipe, 4, sealing cover, 5, flow meter, 6, first gear, 7, second gear, 8, check rod, 9, check spring, 10, stop rod, 11, accommodating chamber. DETAILED DESCRIPTION

[0027] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0028] Embodiment 1

[0029] As Figures 1 to 3 shown, a gear flowmeter with a check mechanism in the first aspect embodiment of the present invention includes a housing 1, a liquid inlet pipe 3, a liquid outlet pipe 2, a first gear 6, a second gear 7, a check mechanism, and a flow meter 5. A receiving cavity 11 is provided in the housing 1. The liquid inlet pipe 3 is arranged at the top of the housing 1. The liquid inlet pipe 3 is arranged vertically, and the bottom end of the liquid inlet pipe 3 is connected to the housing 1. The liquid outlet pipe 2 is arranged at the bottom of the housing 1. The liquid outlet pipe 2 is arranged vertically, and the top end of the liquid outlet pipe 2 is connected to the housing 1. Both the liquid inlet pipe 3 and the liquid outlet pipe 2 are communicated with the receiving cavity 11;

[0030] Both the first gear 6 and the second gear 7 are rotatably arranged in the receiving cavity 11, and the first gear 6 and the second gear 7 mesh with each other;

[0031] The flow meter 5 is arranged outside the housing 1. One end of the rotating shaft of the second gear 7 penetrates through the housing 1 and extends into the flow meter 5. During use, the medium drives the first gear 6 and the second gear 7 to rotate during the flowing process. The flow meter 5 determines and displays the flow value by identifying the rotation speed of the rotating shaft. Specifically, the flow meter 5 can adopt an electronic screen display or a dial display;

[0032] The check mechanism is arranged in the housing 1. The check mechanism is used to prevent the first gear 6 and / or the second gear 7 from rotating when the medium flows backward. Specifically, when the medium flows forward, the first gear 6 and the second gear 7 can rotate normally without being affected by the check mechanism; when the medium flows backward, the first gear 6 and / or the second gear 7 will be stuck by the gear and cannot rotate. At this time, the whole structure acts as a check valve to prevent the medium from flowing backward.

[0033] In this embodiment, it should be noted that the liquid inlet pipe 3, the liquid outlet pipe 2, and the housing 1 are of an integral structure, which is convenient for processing and manufacturing. Conical transition sections are provided at the connection parts of the liquid inlet pipe 3 and the liquid outlet pipe 2 with the housing 1, which can effectively ensure the connection strength between the liquid inlet pipe 2, the liquid outlet pipe 2, and the housing.

[0034] Furthermore, the liquid inlet end tube 3 and the liquid outlet end tube 2 are both cylindrical, and the liquid inlet end tube 3 and the liquid outlet end tube 2 are coaxially arranged; the first gear 6 and the second gear 7 are the same size, and the first gear 6 and the second gear 7 are symmetrically arranged along the axis of the liquid inlet end tube 3, and the overall structure is regular, which is convenient for processing, manufacturing and assembly.

[0035] The technical effects achieved by this embodiment are as follows: by adopting a gear meshing structure, a more accurate correspondence is established between gear rotation and medium flow, thereby improving the accuracy of flow measurement and providing reliable data support for the precise control of the fluid conveying system; by setting a check mechanism, the medium can be effectively prevented from flowing back, the system safety can be protected, and the risk of failure can be reduced. While effectively preventing the medium from flowing back, the obstruction to the flow of the medium can be minimized, the pressure loss can be reduced, the operating efficiency of the entire fluid conveying system can be improved, and energy consumption can be saved; the integrated design of the check mechanism and the flow meter function can reduce the number of system components, reduce installation costs, and improve the overall performance and efficiency of the system.

[0036] Example 2

[0037] like Figures 1 to 3 As shown, this embodiment provides another gear flow meter with a check mechanism, and its structure includes all the contents of embodiment 1, and only the different parts are described below.

[0038] In this embodiment, if Figure 3 As shown, the check mechanism includes a check rod 8, a check spring 9 and a stop rod 10. The check rod 8 is arranged on the side of the second gear 7 away from the first gear 6. The check rod 8 is inclined. The bottom end of the check rod 8 is rotatably connected to the housing 1. Specifically, the bottom end of the check rod 8 is rotatably connected to the housing 1 through a hinge shaft, and the top end of the check rod 8 is placed on the tooth portion of the second gear 7.

[0039] The check spring 9 is vertically arranged, the bottom end of the check spring 9 is connected to the housing 1, and the top end of the check spring 9 is connected to the check rod 8;

[0040] The blocking rod 10 is fixedly connected to the housing 1 . The blocking rod 10 is disposed on a side of the check rod 8 close to the second gear 7 , and the blocking rod 10 abuts against the check rod 8 .

[0041] In this embodiment, it should be noted that the specific working principle of the entire non-return mechanism is as follows: Figure 3As shown in the figure, when the medium flows forward, the medium enters the accommodation chamber 11 from the liquid inlet pipe 3 and flows downward. During the flow of the medium, the first gear 6 is driven to rotate clockwise and the second gear 7 is driven to rotate counterclockwise. During the counterclockwise rotation of the second gear 7, whenever the teeth of the second gear 7 come into contact with the check rod 8, the top end of the check rod 8 will be lifted upward, thus preventing the top end of the check rod 8 from pressing against the teeth of the second gear 7 and causing the second gear to be unable to rotate. The first gear 6 and the second gear 7 can continuously rotate, enabling the medium to continuously flow in from the liquid inlet pipe 3 and flow out from the liquid outlet pipe 2. When the medium flows backward, the medium flows backward from the liquid outlet pipe 2 into the accommodation chamber 11, thereby driving the first gear 6 to rotate counterclockwise and the second gear 7 to rotate clockwise. When the second gear 7 rotates clockwise, the tooth part of the second gear 7 abuts against the top end of the check rod 8 and pushes the top end of the check rod 8 to move downward. However, due to the existence of the stop rod 10, the top end of the check rod 8 cannot move downward. Therefore, when the second gear 7 rotates clockwise, it will be stuck and unable to rotate. Since the first gear 6 and the second gear 7 are meshed with each other, when the second gear 7 cannot rotate, the first gear 6 also cannot rotate, making the medium unable to flow through the first gear 6 and the second gear 7 when flowing backward, so that the medium cannot flow in from the liquid outlet pipe 2 and flow out from the liquid inlet pipe 3 (i.e., reverse flow cannot be achieved).

[0042] The technical effects achieved by this embodiment are as follows: The entire check mechanism has a simple structure, which is convenient for processing, manufacturing, and assembly; the check mechanism and the flowmeter are integrally designed, reducing the number of system components and the installation cost can be reduced.

[0043] Embodiment 3

[0044] As Figures 1 to 3 shown, another gear-type flowmeter with a check mechanism provided in this embodiment includes all the contents of Embodiment 1, and only the different parts will be described below.

[0045] In this embodiment, a sealing cover 4 is further included. The sealing cover 4 is covered on the housing 1, and the sealing cover 4 and the housing 1 enclose a sealing structure. The flowmeter 5 is arranged on the sealing cover 4.

[0046] In this embodiment, it should be noted that the sealing cover 4 is detachably connected to the housing 1, which is convenient for disassembly and maintenance. Moreover, a sealing ring is provided between the sealing cover 4 and the housing 1, which can effectively ensure the sealing performance between the sealing cover 4 and the housing 1;

[0047] The first gear 6 and the second gear 7 are both detachably arranged in the accommodation chamber 11, which is convenient for disassembly and maintenance.

[0048] Embodiment 4

[0049] As Figures 1 to 3As shown, another gear-type flowmeter with a check mechanism provided in this embodiment has a structure including all the contents of Embodiment 1, and only the different parts will be described below.

[0050] In this embodiment, the housing 1, the liquid inlet pipe 3, the liquid outlet pipe 2, the first gear 6 and the second gear 7 are all made of plastic, preferably made of PE material.

[0051] In the thermal industry, the flowmeter is an important part of the process automation instrument. In a plastic pipeline system, due to the special nature of the pipeline material, higher requirements are put forward for the housing material, connection method and corrosion resistance of the flowmeter. Traditional metal material flowmeters have problems such as inconvenient installation, high cost and easy corrosion in plastic pipeline systems. Making the flowmeter housing with PE material and utilizing the characteristics of PE material can be welded to the plastic pipeline, eliminating the need for additional adapters or complex installation processes, reducing the installation cost, improving the construction efficiency, and at the same time ensuring the reliability and tightness of the connection. PE material has good corrosion resistance, can adapt to various corrosive medium environments, can extend the service life of the flowmeter, reduce the maintenance cost, and ensure the long-term stable operation of the flowmeter under harsh working conditions.

[0052] In this embodiment, it should be noted that according to the use requirements, the overall structure can also be made of high-strength corrosion-resistant metal materials or other corrosion-resistant high-strength plastics.

[0053] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

[0054] Terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present invention.

Claims

1. A gear flow meter with a non-return mechanism, characterized in that: The invention comprises a housing (1), a liquid inlet end pipe (3), a liquid outlet end pipe (2), a first gear (6), a second gear (7), a check mechanism and a flow meter (5); a receiving chamber (11) is provided in the housing (1); the liquid inlet end pipe (3) is arranged at the top of the housing (1); the liquid outlet end pipe (2) is arranged at the bottom of the housing (1); the liquid inlet end pipe (3) and the liquid outlet end pipe (2) are both in communication with the receiving chamber (11); The first gear (6) and the second gear (7) are both rotatably disposed in the accommodating cavity (11), and the first gear (6) and the second gear (7) are meshed with each other; The flow meter (5) is arranged outside the housing (1), and one end of the rotating shaft of the second gear (7) passes through the housing (1) and extends into the flow meter (5); The non-return mechanism is arranged in the housing (1), and is used to prevent the first gear (6) and / or the second gear (7) from rotating when the medium flows back.

2. A gear-type flow meter with a non-return mechanism according to claim 1, characterized in that: The non-return mechanism comprises a non-return rod (8), a non-return spring (9) and a blocking rod (10); the non-return rod (8) is arranged on a side of the second gear (7) away from the first gear (6); the non-return rod (8) is arranged obliquely; the bottom end of the non-return rod (8) is rotatably connected to the housing (1); and the top end of the non-return rod (8) is placed on the tooth portion of the second gear (7); The non-return spring (9) is arranged vertically, the bottom end of the non-return spring (9) is connected to the housing (1), and the top end of the non-return spring (9) is connected to the non-return rod (8); The blocking rod (10) is arranged on a side of the non-return rod (8) close to the second gear (7), and the blocking rod (10) abuts against the non-return rod (8).

3. The gear flow meter with a check mechanism according to claim 1, characterized in that: It also comprises a sealing cover (4), wherein the sealing cover (4) is arranged on the housing (1), the sealing cover (4) and the housing (1) together form a sealing structure, and the flow meter (5) is arranged on the sealing cover (4).

4. A gear-type flow meter with a non-return mechanism according to claim 3, characterized in that: The sealing cover (4) is detachably connected to the housing (1), and a sealing ring is provided between the sealing cover (4) and the housing (1).

5. The gear-type flow meter with a non-return mechanism according to claim 4, characterized in that: The first gear (6) and the second gear (7) are both detachably arranged in the accommodating cavity (11).

6. The gear-type flow meter with a non-return mechanism according to claim 1, characterized in that: The liquid inlet end tube (3), the liquid outlet end tube (2) and the shell (1) are an integrated structure.

7. A gear-type flow meter with a non-return mechanism according to claim 6, characterized in that: A conical transition section is provided at the connection between the liquid inlet end tube (3) and the liquid outlet end tube (2) and the shell (1).

8. The gear-type flow meter with a non-return mechanism according to claim 1, characterized in that: The liquid inlet end tube (3) and the liquid outlet end tube (2) are both cylindrical, and the liquid inlet end tube (3) and the liquid outlet end tube (2) are coaxially arranged.

9. The gear-type flow meter with a non-return mechanism according to claim 8, characterized in that: The first gear (6) and the second gear (7) are of the same size, and the first gear (6) and the second gear (7) are symmetrically arranged along the axis of the liquid inlet end tube (3).

10. The gear type flow meter with a non-return mechanism according to claim 1, characterized in that: The shell (1), the liquid inlet end pipe (3) and the liquid outlet end pipe (2) are all made of PE material.

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