Gear pump and method of operation thereof

Abstract

The present application belongs to the technical field of valve, and particularly relates to a gear pump and a working method thereof. The gear pump comprises: a pump body, which is provided with an outflow pipe for connecting a device inflow pipe; a flow guide funnel, which is located in the outflow pipe and is arranged close to the pipe orifice of the outflow pipe; two ends of the flow guide funnel are respectively an inflow port and an outflow port, and the inner diameter of the inflow port is greater than that of the outflow port; wherein the outflow pipe is horizontally arranged; the outflow port is located on the side of the pipe orifice of the outflow pipe; the flow guide funnel is suitable for gathering the medium in the outflow pipe and guiding the gathered medium to be sprayed towards the shaft center of the device inflow pipe, so as to reduce the impact force of the medium on the end surface of the device inflow pipe; the gear pump and the working method thereof gather the medium in the outflow pipe by arranging the flow guide funnel in the outflow pipe, so that most of the medium directly flows into the device inflow pipe, thereby reducing the force received by the end surface of the device inflow pipe.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of valves, and particularly relates to a metering device, in particular to a gear pump and a working method thereof. BACKGROUND

[0002] The outflow pipe of the gear pump needs to be connected with the inflow pipe of the equipment to deliver the medium to the equipment.

[0003] The inflow pipe of the equipment is generally horizontally arranged to reduce the impact force, so that the outflow pipe of the gear pump also needs to be horizontally arranged to be connected; meanwhile, the connection of the gear pump generally adopts internal threads to make the pump body provide sufficient wall thickness to withstand high pressure and mechanical stress.

[0004] However, after the pipeline is connected by threads, the inner wall of the connection may not be in the same plane, so that the impact force of the medium in the outflow pipe acts on the end surface of the inflow pipe, and the inflow pipe is prone to loosening after being subjected to force for a long time.

[0005] Therefore, how to solve the technical problem that the delivered medium is prone to impacting the inflow pipe to cause loosening when the outflow pipe is horizontally arranged is an urgent problem to be solved by those skilled in the art.

[0006] It should be noted that the above information disclosed in the background section is only used to understand the background of the present application, and therefore, the above description is not considered as information of the prior art. SUMMARY

[0007] The present application at least provides a gear pump and a working method thereof.

[0008] In a first aspect, the present application provides a gear pump, comprising: a pump body, on which an outflow pipe for connecting an inflow pipe of an equipment is arranged; a flow guide funnel, which is located in the outflow pipe and is arranged close to the pipe opening of the outflow pipe; two ends of the flow guide funnel are respectively an inflow port and an outflow port, and the inner diameter of the inflow port is greater than that of the outflow port; wherein the outflow pipe is horizontally arranged; the outflow port is located on the side of the pipe opening of the outflow pipe; and the flow guide funnel is adapted to gather the medium in the outflow pipe and guide the gathered medium to be sprayed towards the shaft center of the inflow pipe of the equipment, so as to reduce the impact force of the medium on the end surface of the inflow pipe of the equipment.

[0009] In an alternative embodiment, the outlet pipe comprises: a first flow channel section and a second flow channel section; the first flow channel section is provided with an annular mounting groove on the end face thereof facing the second flow channel section, and an elastic piston assembly is arranged in the annular mounting groove; the outlet of the flow guide funnel is connected with the elastic piston assembly; the annular mounting groove is provided with a group of liquid suction holes on the inner wall thereof; when the valve is opened, the flow guide funnel is pressed to compress the elastic piston assembly; after the valve is closed, the elastic piston assembly is reset to generate negative pressure in the annular mounting groove, and the residual medium in the first flow channel section is absorbed through the group of liquid suction holes.

[0010] In an alternative embodiment, the elastic piston assembly comprises: a sliding sleeve and a spring group; one end of the sliding sleeve is slidingly arranged in the annular mounting groove; the spring group is arranged in the annular mounting groove and connected with the sliding sleeve; when the valve is opened, the flow guide funnel is pressed to push the sliding sleeve to compress the spring group; after the valve is closed, the spring group drives the sliding sleeve to reset to generate negative pressure in the annular mounting groove.

[0011] In an alternative embodiment, the other end of the sliding sleeve is provided with a mounting ring, and the outlet of the flow guide funnel is connected with the mounting ring; the inner diameter of the mounting ring is smaller than the inner diameter of the first flow channel section; the inner diameter of the mounting ring is the same as the inner diameter of the outlet; when the valve is opened, the pressure in the first flow channel section is smaller than the pressure in the annular mounting groove, so that the impurities accumulated in the annular mounting groove are absorbed by negative pressure.

[0012] In an alternative embodiment, the inner diameter of the outlet is smaller than the inner diameter of the equipment inlet pipe.

[0013] In an alternative embodiment, the flow guide funnel is made of an elastic diaphragm, one end of which is connected with the inner wall of the second flow channel section, and the other end of which is connected with the mounting ring; after the valve is closed, the spring group pushes the mounting ring to make the outlet of the flow guide funnel close to the inlet.

[0014] In an alternative embodiment, the sidewall of the flow guide funnel is uniformly provided with a plurality of relief notches in the axial direction; when the valve is opened, the mounting ring is pressed to compress the spring group, and a recoil area is formed between the inlet and the mounting ring to reduce the flow rate of the medium.

[0015] In a second aspect, the disclosure also provides a working method of a gear pump, comprising: horizontally arranging an outlet pipe of a pump body, and connecting the outlet pipe with an equipment inlet pipe; gathering the medium in the outlet pipe through a flow guide funnel in the outlet pipe, and guiding the gathered medium to be sprayed towards the shaft center of the equipment inlet pipe, so as to reduce the impact force of the medium on the equipment inlet pipe.

[0016] In an alternative embodiment, when the valve is opened, the medium impacts the diversion funnel to press the elastic piston assembly; after the valve is closed, the elastic piston assembly is reset to make the annular mounting groove absorb the residual medium in the first flow passage section through the negative pressure of the liquid suction hole group.

[0017] In an alternative embodiment, when the valve is opened, the first flow passage section absorbs the impurities accumulated in the annular mounting groove through negative pressure.

[0018] The beneficial effects of the present application are that the gear pump and the working method thereof gather the medium in the outflow pipe through the diversion funnel arranged in the outflow pipe, so that most of the medium directly flows into the equipment inlet pipe to reduce the force on the end face of the equipment inlet pipe; at the same time, the residual medium in the outflow pipe is sucked away through the negative pressure in the annular mounting groove by the reset movement of the elastic piston assembly, so as to prevent the medium from corroding the connection between the outflow pipe and the equipment inlet pipe; and the impurities accumulated in the annular mounting groove are sucked out through the accelerated flow of the medium in the first flow passage section, so as to prevent the annular mounting groove from being blocked due to the accumulation of impurities.

[0019] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. The objects and other advantages of the application will be realized and attained by the structure particularly pointed out in the description and the drawings.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0022] Fig. 1 A structural schematic diagram of a gear pump provided by the embodiment of the present disclosure is shown in the figure;

[0023] Fig. 2 A partial cross-sectional structural schematic diagram of a gear pump provided by the embodiment of the present disclosure is shown in the figure;

[0024] Fig. 3 A cross-sectional structural schematic diagram of a diversion funnel provided by the embodiment of the present disclosure is shown in the figure.

[0025] In the figure:

[0026] Pump body 1;

[0027] Outlet pipe 2, first flow channel section 21, annular mounting groove 211, liquid hole 212, second flow channel section 22;

[0028] Diversion funnel 3, inlet 31, avoidance gap 311, recoil zone 312, outlet 32;

[0029] Elastic piston assembly 4, sliding sleeve 41, spring assembly 42, mounting ring 43;

[0030] Equipment inlet pipe 5. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] In the related art, the equipment inlet pipe 5 is screwed into the outlet pipe 2, that is, the end face of the equipment inlet pipe 5 is located inside the outlet pipe 2; since the outlet pipe 2 is arranged horizontally, the medium (corrosive) in the outlet pipe 2 will impact the end face of the equipment inlet pipe 5 when entering the equipment inlet pipe 5, causing the equipment inlet pipe 5 to vibrate and become loose.

[0033] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, in the drawings, the thickness of components may be exaggerated or reduced in order to effectively describe the technical content.

[0034] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0035] like Figs. 1 to 3 As shown, at least one embodiment provides a gear pump, comprising: a pump body 1, on which is provided an outlet pipe 2 for connecting to an equipment inlet pipe 5; a guide funnel 3, located in the outlet pipe 2 and arranged near the pipe mouth of the outlet pipe 2; the two ends of the guide funnel 3 are an inlet 31 and an outlet 32 ​​respectively, and the inner diameter of the inlet 31 is larger than the inner diameter of the outlet 32; wherein the outlet pipe 2 is arranged horizontally; the outlet 32 ​​is located on the pipe mouth side of the outlet pipe 2; the guide funnel 3 is suitable for gathering the medium in the outlet pipe 2 and guiding the gathered medium to be sprayed toward the axis of the equipment inlet pipe 5, so as to reduce the impact force of the medium on the end face of the equipment inlet pipe 5.

[0036] In the embodiment, the flow guide funnel 3 is arranged in the outflow pipe 2 to gather the medium in the outflow pipe 2, so that most of the medium directly flows into the equipment inflow pipe 5, thereby reducing the force on the end surface of the equipment inflow pipe 5.

[0037] In some embodiments, as shown in Fig. 3 The outflow pipe 2 includes a first flow channel section 21 and a second flow channel section 22, the inner diameter of the first flow channel section 21 is smaller than that of the second flow channel section 22; the first flow channel section 21 is provided with an annular mounting groove 211 on the end surface thereof facing the second flow channel section 22, and the annular mounting groove 211 is provided with an elastic piston assembly 4.

[0038] Specifically, the outflow port 32 of the flow guide funnel 3 is connected with the elastic piston assembly 4, and the annular mounting groove 211 is provided with a liquid suction hole group 212 on the inner wall thereof located below.

[0039] Specifically, when the valve is opened, the flow guide funnel 3 is forced to extrude the elastic piston assembly 4; after the valve is closed, the elastic piston assembly 4 is reset to move to form negative pressure in the annular mounting groove 211, and the residual medium in the first flow channel section 21 is absorbed through the liquid suction hole group 212.

[0040] In the embodiment, after the valve is closed, no medium flows through the flow guide funnel 3; however, since the outflow pipe 2 is horizontally arranged, there will be residual medium in the first flow channel section 21, which will corrode the connection between the outflow pipe 2 and the equipment inflow pipe 5, therefore, the elastic piston assembly 4 is reset to move to form negative pressure in the annular mounting groove 211, so as to suck away the residual medium in the outflow pipe 2, thereby preventing the medium from corroding the connection between the outflow pipe 2 and the equipment inflow pipe 5.

[0041] In some embodiments, as shown in Fig. 3 The elastic piston assembly 4 includes a sliding sleeve 41 and a spring group 42; one end of the sliding sleeve 41 is slidingly arranged in the annular mounting groove 211; the spring group 42 is arranged in the annular mounting groove 211 and connected with the sliding sleeve 41; when the valve is opened, the flow guide funnel 3 forces the sliding sleeve 41 to extrude the spring group 42; after the valve is closed, the spring group 42 drives the sliding sleeve 41 to reset to move to form negative pressure in the annular mounting groove 211.

[0042] Specifically, one end of the sliding sleeve 41 is slidingly arranged in the annular mounting groove 211 and realizes dynamic sealing, that is, when the sliding sleeve 41 moves away from the annular mounting groove 211, negative pressure is formed in the annular mounting groove 211.

[0043] In the embodiment, the spring group 42 is used as a power source, when the valve is opened, the impact force of the medium causes the sliding sleeve 41 to be forced to extrude the spring group 42; after the valve is closed, the spring group 42 restores the deformation to push the sliding sleeve 41 to move outward to form negative pressure in the annular mounting groove 211.

[0044] In some embodiments, as shown inFig. 3 As shown, the other end of the sliding sleeve 41 is provided with a mounting ring 43, and the outlet 32 of the flow guide funnel 3 is connected with the mounting ring 43; the inner diameter of the mounting ring 43 is smaller than the inner diameter of the first flow channel section 21; the inner diameter of the mounting ring 43 is the same as the inner diameter of the outlet 32; when the valve is opened, the pressure in the first flow channel section 21 is smaller than the pressure in the annular mounting groove 211, so that the negative pressure can absorb the impurities accumulated in the annular mounting groove 211.

[0045] In this embodiment, after the valve is closed, the annular mounting groove 211 can absorb the residual medium, and the medium may contain impurities which are deposited in the annular mounting groove 211; when the valve is opened, the medium in the first flow channel section 21 flows at a high speed to increase the negative pressure in the first flow channel section 21, so that the impurities accumulated in the annular mounting groove 211 are sucked out, and the impurities accumulated in the annular mounting groove 211 are prevented from causing the annular mounting groove 211 to be blocked.

[0046] In some embodiments, as shown in Fig. 3 The inner diameter of the outlet 32 is smaller than the inner diameter of the equipment inlet pipe 5, so that the gathered medium is sprayed towards the axis of the equipment inlet pipe 5 to reduce the impact force of the medium on the end surface of the equipment inlet pipe 5.

[0047] In some embodiments, as shown in Fig. 3 The flow guide funnel 3 is made of an elastic diaphragm, one end of which is connected with the inner wall of the second flow channel section 22, and the other end of which is connected with the mounting ring 43; after the valve is closed, the spring set 42 pushes the mounting ring 43 to make the outlet 32 of the flow guide funnel 3 close to the inlet 31.

[0048] In some embodiments, as shown in Fig. 3 The side wall of the flow guide funnel 3 is uniformly provided with a plurality of avoiding notches 311 along the axial direction; when the valve is opened, the mounting ring 43 is pressed to compress the spring set 42, and a recoil area 312 is formed between the inlet 31 and the mounting ring 43 to reduce the flow rate of the medium.

[0049] Specifically, when the medium impacts on the mounting ring 43, the medium flows reversely to collide with the medium flowing in the normal direction, so as to reduce the flow rate of the medium.

[0050] In this embodiment, the flow rate of the medium is reduced to reduce the impact force of the medium on the end surface of the equipment inlet pipe 5.

[0051] At least one embodiment provides a working method of a gear pump, which comprises the following steps: the outlet pipe 2 of the pump body 1 is horizontally arranged and connected with the equipment inlet pipe 5; the medium in the outlet pipe 2 is gathered by the flow guide funnel 3 in the outlet pipe 2, and the gathered medium is sprayed towards the axis of the equipment inlet pipe 5 to reduce the impact force of the medium on the equipment inlet pipe 5.

[0052] For the specific structure and implementation process of the gear pump, please refer to the relevant discussion in the above embodiments, which will not be repeated here.

[0053] In some embodiments, when the valve is opened, the medium impacts the diversion funnel 3 to extrude the elastic piston assembly 4; after the valve is closed, the annular mounting groove 211 absorbs the residual medium in the first flow passage section 21 through the liquid suction hole group 212 under negative pressure by the reset movement of the elastic piston assembly 4.

[0054] In some embodiments, when the valve is opened, the first flow passage section 21 absorbs the impurities accumulated in the annular mounting groove 211 under negative pressure.

[0055] In summary, the gear pump and its working method set the diversion funnel 3 in the outflow pipe 2 to gather the medium in the outflow pipe 2, so that most of the medium directly flows into the equipment inflow pipe 5, thereby reducing the force on the end face of the equipment inflow pipe 5; at the same time, the negative pressure in the annular mounting groove 211 is generated by the reset movement of the elastic piston assembly 4, so that the residual medium in the outflow pipe 2 is sucked away, thereby preventing the medium from corroding the connection between the outflow pipe 2 and the equipment inflow pipe 5; and the impurities accumulated in the annular mounting groove 211 are sucked out by the accelerated flow of the medium in the first flow passage section 21, thereby preventing the annular mounting groove 211 from being blocked due to the accumulation of impurities.

[0056] In this document, when a first component is referred to as being on or over a second component, it can be directly on or over the second component, or a third component can be interposed between the first component and the second component.

[0057] In this document, when an element or layer is referred to as being "on", "engaged to", "connected to", "attached to", or "coupled to" another element or layer, it can be directly on, engaged, connected, attached, or coupled to the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly engaged to", "directly connected to", "directly attached to", or "directly coupled to" another element or layer, there are no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., "between" versus "directly between", "adjacent" versus "directly adjacent", etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0058] In this document, example embodiments of the disclosure will be described in greater detail. As used herein, such as the expression "at least one of," when preceded by a list of two or more items, modifies the conjunctive list of items immediately following the expression to mean that at least one of the individual items in the list of items can be used, but that more than one of each individual item can be used. For example, the phrase "at least one of a, b, and c" should be construed to mean at least one of each of the items a, b, c alone or in any combination of two or more of the items a, b, c.

[0059] The terminology used herein is for the purpose of describing particular example configurations only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and the like are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order of performance. Additional or alternative steps can be employed.

[0060] As used herein, the phrases "in an embodiment," "according to an embodiment," "in some embodiments," and the like, generally mean the particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of the present disclosure. Thus, appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. As used herein, the term "example" or "exemplary" means "serving as an example, instance, or illustration." Any implementation, aspect or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects or designs. Rather, the term "example" or "exemplary" is intended to present concepts in a concrete manner. As used herein, the term "include" and derivatives thereof mean "comprise" or "comprising," but also "including," "containing," "involving," and variations thereof, and therefore specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0061] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are intended to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, terms such as "first", "second" and other numerical terms are used herein and do not imply order or sequence unless expressly indicated herein. Therefore, the first element, component, region, layer or section discussed above can be referred to as the second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0063] Spatially relative terms, such as "inner", "outer", "below", "below", "lower", "above", "upper", and the like, can be used herein to facilitate the description of the relationship of one element or feature to another element or feature as illustrated in the drawings. In addition to the orientation depicted in the drawings, the spatially relative terms can be intended to encompass different orientations of the device in use or operation. For example, if the device in the drawings is turned over, the element described as "below" or "under" the other element or feature will be oriented "above" the other element or feature. Therefore, the example term "below" can encompass both the above and below orientations. The device can be oriented in other ways (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0064] In the above discussion, unless otherwise stated, the terms "about", "approximately", "substantially" and the like, when used in describing a numerical value, mean a variation of + / - 10% of the value.

[0065] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant personnel can certainly make various changes and modifications within the scope of not deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and must be determined according to the scope of claims.

Claims

1. A gear pump, characterized in that: include: A pump body (1) is provided with an outlet pipe (2) for connecting to an inlet pipe (5) of a device; A diversion funnel (3) is located inside the outlet pipe (2) and is arranged close to the outlet pipe (2); The two ends of the diversion funnel (3) are respectively an inlet (31) and an outlet (32), and the inner diameter of the inlet (31) is larger than the inner diameter of the outlet (32); The outlet pipe (2) is arranged horizontally; The outlet (32) is located at the outlet side of the outlet pipe (2); The guide funnel (3) is suitable for gathering the medium in the outlet pipe (2) and guiding the gathered medium to be sprayed toward the axis of the equipment inlet pipe (5) to reduce the impact force of the medium on the end face of the equipment inlet pipe (5); The outlet pipe (2) comprises: a first flow channel section (21) and a second flow channel section (22); An annular mounting groove (211) is provided on the end surface of the first flow channel section (21) facing the second flow channel section (22), and an elastic piston assembly (4) is provided in the annular mounting groove (211); wherein The outlet (32) of the diversion funnel (3) is connected to the elastic piston assembly (4); The inner wall of the annular mounting groove (211) is provided with a liquid suction hole group (212); When the valve is opened, the guide funnel (3) is forced to squeeze the elastic piston assembly (4), and the pressure in the first flow channel section (21) is lower than the pressure in the annular mounting groove (211), so that impurities accumulated in the annular mounting groove (211) are absorbed by negative pressure; After the valve is closed, the elastic piston assembly (4) resets and moves to create negative pressure in the annular mounting groove (211), and absorbs the residual medium in the first flow channel section (21) through the liquid suction hole group (212).

2. The gear pump according to claim 1, wherein The elastic piston assembly (4) comprises: a sliding sleeve (41) and a spring assembly (42); One end of the sliding sleeve (41) is slidably disposed in the annular mounting groove (211); The spring assembly (42) is arranged in the annular mounting groove (211) and is connected to the sliding sleeve (41); When the valve is opened, the guide funnel (3) is forced to push the sliding sleeve (41) to compress the spring assembly (42); After the valve is closed, the spring assembly (42) drives the sliding sleeve (41) to reset and move so as to create negative pressure in the annular mounting groove (211).

3. The gear pump according to claim 2, wherein: The other end of the sliding sleeve (41) is provided with a mounting ring (43), and the outlet (32) of the diversion funnel (3) is connected to the mounting ring (43); wherein The inner diameter of the mounting ring (43) is smaller than the inner diameter of the first flow channel section (21); The inner diameter of the mounting ring (43) is the same as the inner diameter of the outlet (32).

4. The gear pump according to claim 3, wherein The inner diameter of the outlet (32) is smaller than the inner diameter of the equipment inlet pipe (5).

5. The gear pump according to claim 4, wherein The diversion funnel (3) is made of an elastic diaphragm, one end of which is connected to the inner wall of the second flow channel section (22), and the other end is connected to the mounting ring (43); After the valve is closed, the spring assembly (42) pushes the mounting ring (43) to bring the outlet (32) of the diversion funnel (3) into close proximity with the inlet (31).

6. The gear pump according to claim 5, wherein The side wall of the diversion funnel (3) is evenly provided with a plurality of avoidance notches (311) along the axial direction; When the valve is opened, the mounting ring (43) is pressurized to compress the spring assembly (42), and a backwash zone (312) is formed between the inlet (31) and the mounting ring (43) to reduce the flow rate of the medium.

7. A method for operating a gear pump according to any one of claims 1 to 6, characterized in that: include: The outlet pipe (2) of the pump body (1) is arranged horizontally and is connected to the inlet pipe (5) of the equipment; The medium in the outlet pipe (2) is gathered by the guide funnel (3) in the outlet pipe (2), and the gathered medium is directed to be ejected toward the axis of the equipment inlet pipe (5), so as to reduce the impact force of the medium on the equipment inlet pipe (5).

8. The operating method of the gear pump according to claim 7, characterized in that: When the valve is opened, the medium impacts the diversion funnel (3) to squeeze the elastic piston assembly (4); After the valve is closed, the elastic piston assembly (4) is reset to allow the annular mounting groove (211) to absorb the residual medium in the first flow channel section (21) through the liquid suction hole group (212) under negative pressure.

9. The operating method of the gear pump according to claim 8, characterized in that: When the valve is opened, the first flow channel section (21) absorbs impurities accumulated in the annular mounting groove (211) through negative pressure.

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