Gear pump with gravity balance and local temperature control structure rotary joint

Abstract

The utility model relates to the field of gear pumps, and discloses a gear pump with a gravity balance and local temperature control structure rotary joint, which comprises a pump body, a rotating shaft, a rotating shaft and a rotating shaft, the rotary joint is arranged on the driving gear shaft positioned outside the pump body; wherein the rotary joint comprises an inner pipe, the inner pipe is inserted into the driving gear shaft, a first balance hole is formed in the inner pipe, and a sealing opening is formed in one end, located in the pump body, of the inner pipe; the heating medium inlet is formed in the end, away from the pump body, of the inner pipe, and the heating medium inlet communicates with the inner pipe; the heating medium outlet is formed in the lower portion of the inner pipe, and the heating medium outlet communicates with the first balance hole. The tail end of the inner pipe of the rotary joint is plugged, the first balance hole is formed in the inner pipe, the gravity of the cantilever section of the inner pipe is completely or partially balanced through the reverse acting force generated when fluid flows out of the small hole, stress of a bearing and a mechanical seal in the rotary joint is reduced, the service life is prolonged, and the failure rate is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gear pumps, in particular to a gear pump with a rotary joint having a gravity balance and a local temperature control structure. Background Art

[0002] A gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump body and the meshing gears to transport liquid or increase its pressure. It consists of two closed spaces, two gears, a pump body, and front and rear covers. When the gears rotate, the volume of the space on the side where the gears are disengaged changes from small to large, forming a vacuum, sucking the liquid in, and the volume of the space on the side where the gears are meshing changes from large to small, squeezing the liquid into the pipeline. The suction chamber and the discharge chamber are separated by the meshing line of the two gears. The pressure at the discharge port of the gear pump depends entirely on the size of the resistance at the pump outlet. The gear pump is a hydraulic transmission device that realizes the functions of liquid transportation, pressure increase, flow regulation, etc. based on the propulsion of the gears. It is widely used in mechanical equipment, engineering machinery, ships, and industrial fields. With the continuous advancement and innovation of technology, the structure and performance of gear pumps are also being continuously optimized, making it play a greater role in various fields.

[0003] When the melt pump in the chemical industry is operated under high viscosity and other plastic melt conditions, shear and friction heat will be generated, causing the material in the pump to heat up, the wear load on the bearing parts to increase, and the local temperature rise to be abnormal, affecting the performance of the conveyed materials and the stability of the production process. In this case, the pump shaft is generally cooled and temperature controlled, and a rotary joint is installed at the shaft end to control the shaft temperature. The structural limitations of the rotary joint and the structural principle of the rotary joint result in a long internal cantilever of the inner tube. Under the action of gravity at the end of the tube, a long-term unbalanced force will be generated on the rolling bearing and mechanical seal of the rotary joint, thereby reducing the life of the rolling bearing and mechanical seal components, resulting in mechanical failures such as water leakage and abnormal noise at the user's work site, affecting the user's production progress, thereby reducing the quality reputation of the product.

[0004] Therefore, there is an urgent need for a gear pump with a rotary joint with a gravity balance and a local temperature control structure to solve the problem of unbalanced rotary joint caused by excessive length of the inner tube, which affects the use of the gear pump. Utility Model Content

[0005] In view of this, the utility model proposes a gear pump with a rotary joint with a gravity balance and a local temperature control structure, aiming to solve the problem that the rotary joint is unbalanced due to an excessively long inner tube, which affects the use of the gear pump.

[0006] The utility model provides a gear pump with a gravity-balanced and local temperature-controlled structural rotary joint, comprising:

[0007] A pump body, wherein a driving gear shaft and a driven gear shaft are arranged on the pump body;

[0008] A rotary joint, which is arranged on the driving gear shaft located outside the pump body; wherein the rotary joint comprises:

[0009] An inner tube, which is inserted into the driving gear shaft, a first balancing hole is opened on the inner tube, and a seal is provided at one end of the inner tube located in the pump body;

[0010] A heat medium inlet is arranged at one end of the inner tube away from the pump body, and the heat medium inlet is communicated with the inner tube;

[0011] A heat medium outlet is arranged at the lower part of the inner tube, and the heat medium outlet is communicated with the first balancing hole.

[0012] Furthermore, the rotary joint further comprises:

[0013] A second balancing hole, which is arranged on the inner tube, and the second balancing hole is connected to the heat medium outlet;

[0014] A third balancing hole is arranged on the inner tube, and the third balancing hole is connected to the heat medium outlet.

[0015] Furthermore, the first balancing hole is arranged on a side of the inner tube close to the heat medium outlet.

[0016] Furthermore, the second balancing hole and the third balancing hole are arranged on a side of the inner tube close to the heat medium outlet, and the second balancing hole, the third balancing hole and the first balancing hole are arranged horizontally.

[0017] Furthermore, the rotary joint further comprises:

[0018] A support portion is arranged on the outer side wall of the inner tube, and is used to strengthen and support the inner tube.

[0019] Furthermore, the rotary joint further comprises:

[0020] The rotor is arranged on the inner side wall of one end of the driving gear shaft away from the pump body and extends outward.

[0021] Furthermore, the rotary joint further comprises:

[0022] A bearing, which is arranged at an end of the rotor away from the driving gear shaft and is located outside the outer side wall of the inner tube;

[0023] A housing is arranged outside the bearing.

[0024] Furthermore, the rotary joint further comprises:

[0025] A mechanical seal is arranged at one end of the bearing away from the driving gear shaft and is located in the housing.

[0026] Compared with the prior art, the beneficial effect of the utility model lies in that, by sealing the end of the inner tube of the rotary joint and opening a first balancing hole on the inner tube, the reverse force when the fluid flows out of the small hole is used to completely or partially balance the gravity of the cantilever section of the inner tube itself, thereby reducing the stress on the bearing and mechanical seal in the rotary joint, increasing the service life and reducing the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0028] Figure 1 A schematic diagram of the structure of a gear pump with a gravity-balanced and local temperature-controlled structural rotary joint provided in an embodiment of the utility model;

[0029] Figure 2 for Figure 1 Enlarged detail of point A in the middle.

[0030] In the figure: 100, pump body; 110, driving gear shaft; 120, driven gear shaft; 200, rotary joint; 210, inner tube; 211, first balance hole; 212, seal; 213, second balance hole; 214, third balance hole; 220, heat medium inlet; 230, heat medium outlet; 240, support part; 250, rotor; 260, bearing; 270, housing; 280, mechanical seal. DETAILED DESCRIPTION

[0031] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying 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 specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] See also Figure 1-2 As shown, this embodiment provides a gear pump with a gravity-balanced and local temperature-controlled structural rotary joint, including a pump body 100, on which a driving gear shaft 110 and a driven gear shaft 120 are arranged; a rotary joint 200, which is arranged on the driving gear shaft 110 located outside the pump body 100; wherein the rotary joint 200 includes: an inner tube 210, which is inserted into the driving gear shaft 110, and a first balancing hole 211 is opened on the inner tube 210, and a seal 212 is arranged at one end of the inner tube 210 located in the pump body 100; a heat medium inlet 220, which is arranged at one end of the inner tube 210 away from the pump body 100, and the heat medium inlet 220 is connected to the inner tube 210; a heat medium outlet 230, which is arranged at the lower part of the inner tube 210, and the heat medium outlet 230 is connected to the first balancing hole 211.

[0036] It can be understood that by sealing the end of the inner tube 210 of the rotary joint 200 and opening a first balancing hole 211 on the inner tube 210, the reverse force when the fluid flows out of the small hole is used to fully or partially balance the gravity of the cantilever section of the inner tube 210 itself, thereby reducing the stress on the bearing 260 and the mechanical seal in the rotary joint 200, thereby increasing the service life and reducing the failure rate.

[0037] In a specific embodiment of the present application, the rotary joint 200 also includes a second balancing hole 213, which is arranged on the inner tube 210, and the second balancing hole 213 is connected to the heat medium outlet 230; a third balancing hole 214, which is arranged on the inner tube 210, and the third balancing hole 214 is connected to the heat medium outlet 230.

[0038] It is understandable that providing the second balancing hole 213 and the third balancing hole 214 on the inner tube 210 can increase the reverse force when the fluid flows out from the second balancing hole 213 and the third balancing hole 214, completely or partially balance the gravity of the cantilever section of the inner tube 210 itself, thereby increasing the service life and reducing the failure rate.

[0039] In a specific embodiment of the present application, the first balancing hole 211 is disposed on a side of the inner tube 210 close to the heat medium outlet 230 .

[0040] It is understandable that the first balancing hole 211 is disposed on the side of the inner tube 210 close to the heat medium outlet 230 to balance the gravity, so that the fluid can be discharged from the inner tube 210 quickly and conveniently, and the gravity can be quickly balanced.

[0041] In a specific embodiment of the present application, the second balancing hole 213 and the third balancing hole 214 are arranged on one side of the inner tube 210 close to the heat medium outlet 230 , and the second balancing hole 213 , the third balancing hole 214 and the first balancing hole 211 are arranged horizontally.

[0042] It is understandable that the second balancing hole 213 and the third balancing hole 214 are arranged on one side of the inner tube 210 close to the heat medium outlet 230, which can meet the effect of balancing gravity, enable the fluid to be discharged from multiple balancing holes at the same time, and quickly balance gravity.

[0043] In a specific embodiment of the present application, the rotary joint 200 further includes a support portion 240 disposed on the outer side wall of the inner tube 210 , and the support portion 240 is used to strengthen and support the inner tube 210 .

[0044] It is understandable that the support portion 240 is coated on the outer wall of the inner tube 210 , which can enhance the hardness and bearing capacity of the inner tube 210 and improve the service life of the inner tube 210 .

[0045] In a specific embodiment of the present application, the rotary joint 200 further includes a rotor 250 , which is disposed on the inner side wall of an end of the driving gear shaft 110 away from the pump body 100 and extends outward.

[0046] In a specific embodiment of the present application, the rotary joint 200 further includes a bearing 260 , which is disposed at one end of the rotor 250 away from the driving gear shaft 110 and located outside the outer wall of the inner tube 210 ; and a housing 270 , which is disposed outside the bearing 260 .

[0047] In a specific embodiment of the present application, the rotary joint 200 further includes a mechanical seal 280 , which is disposed at an end of the bearing 260 away from the driving gear shaft 110 and is located inside the housing 270 .

[0048] It is understandable that the mechanical seal 280 is the abbreviation of mechanical seal, which is a shaft sealing device used for rotating fluid machinery. For example, centrifugal pumps, centrifuges, reactors, compressors and other equipment. Since the transmission shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment, and the medium in the equipment leaks out through the gap. If the pressure in the equipment is lower than the atmospheric pressure, the air leaks into the equipment, so there must be a shaft sealing device to prevent leakage. Preferably, the mechanical seal 280 of the utility model is used to prevent leakage of heat medium fluid.

[0049] Working principle of the utility model: when the gear pump is working, the rotary joint 200 is installed on the pump body 100, and the heat medium fluid is input from the heat medium inlet 220, flows out from the first balance hole 211, the second balance hole 213 and the third balance hole 214, and is discharged from the heat medium outlet 230.

[0050] In summary, by blocking the end of the inner tube 210 of the rotary joint 200 and opening the first balancing hole 211 on the inner tube 210, the reverse force when the fluid flows out of the small hole is used to completely or partially balance the cantilever section gravity of the inner tube 210 itself, thereby reducing the stress on the bearing 260 and the mechanical seal 280 in the rotary joint 200, improving the service life and reducing the failure rate. The second balancing hole 213 and the third balancing hole 214 are provided on the inner tube 210, so as to increase the reverse force when the fluid flows out of the second balancing hole 213 and the third balancing hole 214, completely or partially balance the cantilever section gravity of the inner tube 210 itself, improve the service life and reduce the failure rate.

[0051] Furthermore, the first balancing hole 211 is arranged on the side of the inner tube 210 close to the heat medium outlet 230, which can satisfy the effect of balancing gravity, and can make the fluid quickly and conveniently discharged from the inner tube 210, and quickly balance gravity. The second balancing hole 213 and the third balancing hole 214 are arranged on the side of the inner tube 210 close to the heat medium outlet 230, which can satisfy the effect of balancing gravity, and can make the fluid be discharged from multiple balancing holes at the same time, and quickly balance gravity. The support part 240 is coated on the outer wall of the inner tube 210, which can enhance the hardness and bearing capacity of the inner tube 210 and improve the service life of the inner tube 210.

[0052] Those skilled in the art can understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gear pump with a gravity-balanced and local temperature-controlled structure rotary joint, characterized in that: include: A pump body, wherein a driving gear shaft and a driven gear shaft are arranged on the pump body; A rotary joint, which is arranged on the driving gear shaft located outside the pump body; wherein the rotary joint comprises: An inner tube, which is inserted into the driving gear shaft, a first balancing hole is opened on the inner tube, and a seal is provided at one end of the inner tube located in the pump body; A heat medium inlet is arranged at one end of the inner tube away from the pump body, and the heat medium inlet is communicated with the inner tube; A heat medium outlet is arranged at the lower part of the inner tube, and the heat medium outlet is communicated with the first balancing hole.

2. The gear pump with a gravity-balanced and local temperature-controlled structure rotary joint according to claim 1, characterized in that: The rotary joint also includes: A second balancing hole, which is arranged on the inner tube, and the second balancing hole is connected to the heat medium outlet; A third balancing hole is arranged on the inner tube, and the third balancing hole is connected to the heat medium outlet.

3. The gear pump with a gravity-balanced and local temperature-controlled structure rotary joint according to claim 1, characterized in that: The first balancing hole is arranged on a side of the inner tube close to the heat medium outlet.

4. The gear pump with a gravity-balanced and local temperature-controlled structure rotary joint according to claim 2, characterized in that: The second balancing hole and the third balancing hole are arranged on a side of the inner tube close to the heat medium outlet, and the second balancing hole, the third balancing hole and the first balancing hole are arranged horizontally.

5. The gear pump with a gravity-balanced and local temperature-controlled structure rotary joint according to claim 1, characterized in that: The rotary joint also includes: A support portion is arranged on the outer side wall of the inner tube, and is used to strengthen and support the inner tube.

6. The gear pump with a gravity-balanced and local temperature-controlled structure rotary joint according to claim 1, characterized in that: The rotary joint also includes: The rotor is arranged on the inner side wall of one end of the driving gear shaft away from the pump body and extends outward.

7. The gear pump with a gravity-balanced and local temperature-controlled structure rotary joint according to claim 6, characterized in that: The rotary joint also includes: A bearing, which is arranged at an end of the rotor away from the driving gear shaft and is located outside the outer side wall of the inner tube; A housing is arranged outside the bearing.

8. The gear pump with a gravity-balanced and local temperature-controlled structure rotary joint according to claim 7, characterized in that: The rotary joint also includes: A mechanical seal is arranged at one end of the bearing away from the driving gear shaft and is located in the housing.

Images