A circulation pump and a circulation pump clearance control method

Abstract

The present invention relates to a circulation pump, comprising a pump body, a driving shaft, a driven shaft, a driving gear, a driven gear and a rotor, wherein the rotor comprises a driving rotor and a driven rotor, an input hole and an output hole are arranged on both sides of the pump body, one side of the input end cover is a fixed end, and one side of the output end cover is a floating end; the end covers are arranged at both ends of the pump body, the driving shaft and the driven shaft are arranged in the pump body, the rotor is arranged in a cavity in the pump body, the driving gear and the driving rotor are fixedly installed on the driving shaft, the driven gear and the driven rotor are fixedly installed on the driven shaft, and the driving gear and the driven gear are meshed with each other; a heat conduction component that fits the shape of the pump body is arranged on the inner surface or outer surface of the pump body. The circulation pump can realize reasonable control of the gap, effectively improve the pressure rise of the circulation pump, improve efficiency, and extend the service life of the circulation pump.

Description

Technical Field

[0001] The invention belongs to the technical field of circulating pumps, and in particular relates to a circulating pump and a circulating pump gap control method. Background Art

[0002] The circulation pump device can be used in many fields. For example, in the fuel cell system, the excess fuel in the fuel cell reaction process is recycled to improve the fuel utilization rate and the battery specific power and energy. The circulation pump can have a larger pressure rise by properly regulating the gap. At the same time, excessive temperature increase can also make the gap too small and cause jamming, so how to reasonably control the gap of the circulation pump is an urgent problem to be solved. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a circulation pump, comprising a pump body, a driving shaft, a driven shaft, a driving gear, a driven gear and a rotor, wherein the rotor comprises a driving rotor and a driven rotor, an input hole and an output hole are arranged on both sides of the pump body, one side of the input end cover is a fixed end, and one side of the output end cover is a floating end;

[0004] The end covers are arranged at both ends of the pump body, the driving shaft and the driven shaft are arranged in the pump body, the rotor is arranged in a cavity in the pump body, the driving shaft is fixedly mounted with a driving gear and a driving rotor, the driven shaft is fixedly mounted with a driven gear and a driven rotor, and the driving gear and the driven gear are meshed with each other;

[0005] A heat-conducting component that fits the shape of the pump body is arranged on the inner surface or the outer surface of the pump body.

[0006] According to one aspect of the present invention, the heat dissipation assembly includes a tube body and a heat dissipation cavity, the heat conduction cavity is arranged on the outer surface of the pump body corresponding to the cavity position, and the tube body is connected to the heat conduction cavity.

[0007] According to one aspect of the present invention, the heat-conducting component is arranged on the outer surface of the pump body by 3D printing technology.

[0008] According to one aspect of the present invention, the driven gear is two gears of the same thickness connected up and down as one body.

[0009] According to one aspect of the present invention, it also includes a gland, an adjustment gasket, a corrugated gasket and a locking nut, a pair of deep groove ball bearings are respectively installed at both ends of the driving shaft and the driven shaft, one end of the inner ring of the deep groove ball bearing located on the fixed end side is fastened to the driving shaft or the driven shaft through a locking nut, and the other end is connected to the adjustment gasket, the outer ring is compressed by the gland, and the gland is fixed to the pump body by screws;

[0010] The inner ring of the deep groove ball bearing located at one side of the floating end is fastened to the driving shaft or the driven shaft through a locking nut, and the outer ring is pre-tightened by the corrugated gasket and the gland in turn, wherein the gland is fixed to the pump body by screws.

[0011] The processing dimensions of the gland at the movable end satisfy: △ = F 轴 / k 波纹垫片

[0012] Among them, △ is the amount of gland removal, F 轴 For the mobile end 纹垫片 is the stiffness of the corrugated gasket.

[0013] According to one aspect of the present invention, the dimension chain of the axial dimension of the pump body satisfies the following conditions:

[0014] L 泵体 =L 转子 +δ3+δ4;

[0015] Δδ=ΔLa-δ4;

[0016] ΔLa=G 固 +F 轴 / k 固 ;

[0017] Wherein, ΔLa is the axial displacement of the deep groove ball bearing at the fixed end, G 固 is the axial clearance of the fixed end deep groove ball bearing, k 固 is the axial stiffness of the fixed end deep groove ball bearing, Δδ is the wear amount of the axial adjustment gasket, L 转子 is the length of the rotor, L 泵体 is the pump body depth, δ3 and δ4 are the axial clearances of the floating end and the fixed end respectively, and F 轴 It is the preload force. Here, the floating end uses the pressure cover to deform the corrugated gasket to form a clamping force, which presses the outer ring of the floating end bearing.

[0018] According to one aspect of the present invention, it also includes a grinding ring, which is attached to both sides of the axial end surface of the rotor and fixed to the pump body by screws, wherein the grinding ring is finely processed after the wear amount and wear direction are accurately measured, and the processing amount of the grinding ring satisfies the relationship: ΔL 磨 =δ3+L 转子 *ΔT, where ΔL 磨 L is the machining amount of the grinding ring. 转子 is the total length of the rotor, and ΔT is the temperature difference between the inside and outside of the rotor.

[0019] In order to achieve accurate control of the gap of a circulating pump and improve the working efficiency and safety performance of the circulating pump, the present invention provides a method for controlling the gap of a circulating pump, which also includes a gap measuring device, a medium temperature measuring device, a rotor temperature measuring device, a conveying device and a data acquisition instrument;

[0020] The gap control method of the circulating pump comprises the following steps:

[0021] S1. The gap between the rotor and the pump body is measured by the gap measuring device, and the measurement data is sent to the data acquisition instrument;

[0022] S2. The temperature of the rotor is measured by the rotor temperature measuring device, and the measurement data is sent to the data acquisition instrument;

[0023] S3. The gap is analyzed by the data acquisition instrument. If the gap exceeds a reasonable gap value, the conveying device is started to convey the medium to the heat dissipation component. When the gap value drops to a reasonable range, the conveying device is closed.

[0024] According to one aspect of the present invention, in step S2, the rotor temperature measuring device includes a temperature sensor and a conductive slip ring, and the temperature sensor is connected to the data acquisition instrument through the conductive slip ring.

[0025] According to one aspect of the present invention, in step S3, the temperature of the medium satisfies the relationship: δ2 = δ 20 +D*(T 介质 -T 转子 )*α, where δ2 is the radial clearance between the rotor and the pump body, δ 20 is the clearance at room temperature, D is the rotor diameter, T 转子 is the rotor outer surface temperature, T 介质 is the conveying medium temperature, and α is the thermal expansion coefficient of the rotor material.

[0026] According to the concept of the present invention, the circulating pump is further provided with a heat-conducting component on the inner surface or outer surface of the pump body. When the circulating pump is used to transport a medium with a certain amount of heat or the rotor speed is too high, the rotor is easily thermally expanded, thereby reducing the gap between the rotor and the pump body, making it very easy for the rotor to contact the pump body during rotation. Through the provision of the heat-conducting component, the temperature of the rotor can be cooled through the heat-conducting component, thereby improving the safety and service life of the circulating pump. In addition, according to the concept of the present invention, when the circulating pump transports a medium with a relatively low temperature or room temperature, the heat-conducting component can be used to appropriately increase the temperature, so as to further control the gap between the rotor and the pump body within a reasonable range. Through the reasonable control of the gap, the pressure rise of the circulating pump can be effectively improved, the efficiency can be improved, and energy can be saved.

[0027] According to the concept of the present invention, the circulation pump clearance control method can accurately ensure the clearance value and estimate the clearance change value, thereby improving the safety of the system, reducing the parasitic energy consumption of the system, and improving the system efficiency. In addition, the method is simple to operate and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic side cross-sectional view of a circulation pump according to one embodiment of the present invention is shown;

[0029] Figure 2 A schematic front cross-sectional view of a circulation pump according to an embodiment of the present invention is shown;

[0030] Figure 3 A perspective view schematically showing a circulation pump according to an embodiment of the present invention;

[0031] Figure 4 The figure schematically shows an axial clearance diagram of a circulation pump according to an embodiment of the present invention.

[0032] Figure 5 A flow chart schematically shows a circulation pump clearance control method. DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings. They 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 operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0036] Combination Figure 1 and Figure 2As shown, the present invention provides a circulation pump, including a pump body 1, and a driving shaft 11, a driven shaft 12, a driving gear 13, a driven gear 14 and a rotor 15 arranged in the pump body 1, wherein the driving gear 13 is mounted on the driving shaft 11, and the driven gear 14 is mounted on the driven shaft 12, and the driving gear 13 and the driven gear 14 are meshed with each other. The rotor 15 is respectively mounted on the driving shaft 11 and the driven shaft 12. When the driving shaft 11 rotates, the driven shaft 12 is driven to rotate through the mutually meshing driving gear 13 and the driven gear 14, and finally the rotor 15 mounted on the driving shaft 11 and the driven shaft 12 is driven to rotate in the cavity 16 in the pump body 1. In this embodiment, a heat conduction component 17 is also arranged on the inner surface or the outer surface of the pump body 1. According to the concept of the present invention, when the circulating pump is used to transport a medium with a certain amount of heat or the rotor speed is too high, the rotor 15 is easily expanded by heat, thereby reducing the gap between the rotor 15 and the pump body 1, making it very easy for the rotor 15 to contact the pump body 1 during rotation. By setting the heat-conducting component 17, the temperature of the rotor 15 can be cooled by the heat-conducting component 17, thereby improving the safety and service life of the pump body. In addition, according to the concept of the present invention, when the circulating pump transports a medium with a relatively low temperature or room temperature, the heat-conducting component 17 can be appropriately heated to further control the gap between the rotor 15 and the pump body within a reasonable range. By reasonably controlling the gap, the pressure rise of the circulating pump is effectively increased, the efficiency is improved, and energy is saved. According to the concept of the present invention, the heat-conducting component 17 fits the shape of the pump body 1, further improving the heat conduction efficiency and ensuring the stability of heat transfer.

[0037] like Figure 3 As shown, according to an embodiment of the present invention, the heat-conducting assembly 17 includes a tube body 18 and a heat-conducting cavity 19, the heat-conducting cavity 19 is arranged on the outer surface of the cavity 16, and the tube body 18 is connected to the heat-conducting cavity 19. According to the concept of the present invention, in such a configuration, the heat-conducting medium can enter the heat-conducting cavity 19 through the tube body 18, and the radial gap δ2 between the rotor 15 and the pump body can be further accurately controlled.

[0038] According to the concept of the present invention, the heat-conducting component 17 can also be formed integrally with the pump body 1 through 3D printing technology and arranged on the inner surface of the pump body 1, so as to further accelerate the heat transfer efficiency and make the gap control more accurate.

[0039] like Figures 1 to 3As shown, according to one embodiment of the present invention, the driven gear 14 is divided into two gears of the same thickness connected as one piece up and down. In this embodiment, the misalignment of the upper and lower gears is the meshing side clearance value of the driving gear 13 and the driven gear 14, which is fixed by pins. According to the concept of the present invention, the rotor 15 is driven by a synchronous gear, and the synchronous gear combination gap directly affects the rotor meshing state, so through the above-mentioned setting, the gap δ1 between the rotors is further controlled. That is, when rotating in the forward direction, the driving gear 13 meshes with the upper driven gear 14 for transmission. When rotating in the reverse direction, the driving gear 13 meshes with the lower driven gear 14 to eliminate the return difference, so that the synchronization of the driving gear 13 and the driven gear 14 with the rotor 15 is completely consistent, thereby realizing the precise control of the gap δ1 between the rotors 15. While further improving the efficiency, it also increases the service life of the circulating pump.

[0040] like Figures 1 to 3 As shown, according to an embodiment of the present invention, a pair of deep groove ball bearings 20 are respectively installed on both sides of the driving shaft 11 and the driven shaft 12, and the deep groove ball bearings 20 are fixed by a gland 21, a corrugated gasket 22 and a locking nut. In this embodiment, one end of the inner ring of the deep groove ball bearing 20 located on the fixed end side is fastened to the driving shaft 11 or the driven shaft 12 by a locking nut 27, and the other end is connected to the adjustment gasket 28, and the outer ring of the deep groove ball bearing 20 is pressed by a gland 21 screwed to the pump body 1. The inner ring of the deep groove ball bearing 20 located on the floating end side is fastened to the driving shaft 11 or the driven shaft 12 by a locking nut 27, and the outer ring of the deep groove ball bearing 20 located on the floating end side is pressed by a corrugated gasket 22 and a gland 21 screwed to the pump body 1 in turn. According to the concept of the present invention, the deep groove ball bearing 20 can withstand a certain amount of axial load in any direction, and has the advantages of small friction loss and high limit speed. However, it has the problem of relatively large axial clearance. According to the above-mentioned preload setting of the ball bearing 20, its axial clearance can be better controlled. While making the bearing operation more stable, it can also better control the axial clearances δ3 and δ4 between the movable end and the fixed end, thereby improving the working efficiency and safety performance of the circulating pump.

[0041] like Figures 2 to 4 As shown, according to the concept of the present invention, the dimensional chain of the axial dimension of the pump body 1 satisfies the formula: ΔLa=G 固 +F 轴 / k 固 , Δδ=ΔLa-δ4, L 泵体 =L 转子 +δ3+δ4. Among them, ΔLa is the axial displacement of the fixed end deep groove ball bearing 20, G 固 is the axial clearance of the fixed end deep groove ball bearing 20, k 固is the axial stiffness of the fixed end deep groove ball bearing 20, Δδ is the wear amount of the axial adjustment gasket 28, and L 转子 is the length of the rotor 15, L 泵体 is the depth of pump body 1, δ3 and δ4 are the axial clearances of the floating end and the fixed end respectively, and F 轴 By controlling the dimensional chain of the axial dimension of the pump body 1, the axial clearances δ3 and δ4 between the floating end and the fixed end can be precisely controlled to increase the pressure rise of the circulating pump, and ultimately improve the working efficiency of the circulating pump.

[0042] like Figures 1 to 4 As shown, according to an embodiment of the present invention, a grinding ring 23 is provided on both sides of the axial end surface of the rotor 15, and the grinding ring 23 is fixed to the pump body 1 by screws. In this embodiment, firstly, grinding is performed by adding a grinding ring 23 made of polytetrafluoroethylene (or other plastic materials) on both sides. After the grinding is completed, the wear amount and wear direction of the wear surface of the grinding ring 23 are accurately modeled by a laser tracker (or other precision measurement means). The grinding ring 23 is precisely machined according to the accurate modeling results. During the machining, the axial clearance theoretical value is used as the tool compensation. The free end needs to increase the axial dimension increase caused by thermal expansion, specifically ΔL 磨 =δ3+L 转子 *ΔT, where ΔL 磨 L is the machining amount of the grinding ring. 转子 is the total length of the rotor, ΔT is the temperature difference between the inside and outside of the rotor, and the consistency of the clearance between the rotor end face and the baffle is ensured. According to the concept of the present invention, combined with the above-mentioned control of the axial clearance of the deep groove ball bearing 20, the axial clearances δ3 and δ4 of the movable end and the fixed end are controlled within a reasonable range by accurately controlling the size of the matching wear ring 23, which ultimately improves the working efficiency and safety performance of the circulating pump.

[0043] like Figure 5As shown, the present invention provides a circulation pump gap control method, firstly, the radial gap δ2 between the rotor 15 and the pump body 1 is measured by the gap measuring device 25, and the measurement data is sent to the data acquisition instrument, and the radial gap δ2 between the rotor 15 and the pump body 1 is monitored at all times by the cooperation of the data acquisition instrument and the gap measuring device 25. Then, the temperature of the rotor 15 is measured by the rotor temperature measuring device, and the measurement data is sent to the data acquisition instrument 24. In this embodiment, the rotor temperature measuring device includes a temperature sensor and a conductive slip ring. A φ5 center hole is machined in the driving shaft 11 of the rotor 15 for leading out the data transmission line of the temperature sensor, and the rotary motion is converted into a stationary end at the outlet through a conductive slip ring for measurement. According to the concept of the present invention, this measurement method has accurate test results and low cost. Finally, the gap δ2 between the rotor 15 and the pump body 1 is measured and analyzed by the data acquisition instrument. If it exceeds the reasonable gap value, the conveying device is started to convey the medium to the heat conductive component 17. When the gap value δ2 drops to a reasonable range, the conveying device is closed. According to the concept of the present invention, the method has high testing accuracy, can accurately guarantee the gap value, and estimate the gap change value, thereby improving the safety of the system, reducing the parasitic energy consumption of the system, and improving the system efficiency.

[0044] According to one embodiment of the present invention, the temperature of the medium satisfies the relationship: δ2 = δ 20 +D*(T 介质 -T 转子 )*α, where δ 20 is the clearance at room temperature, D is the rotor diameter, T 转子 is the rotor outer surface temperature, T 介质 is the temperature of the conveying medium, and α is the thermal expansion coefficient of the rotor material. According to the concept of the present invention, by setting the relationship satisfied by the medium temperature, the precise control of the gap can be ensured, the energy consumption can be further reduced, and the safety performance of the circulating pump can be improved.

[0045] The above is only one embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. 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 circulating pump, comprising a pump body (1), a driving shaft (11), a driven shaft (12), a driving gear (13), a driven gear (14) and a rotor (15), wherein the rotor (15) comprises a driving rotor and a driven rotor, an input hole and an output hole are arranged on both sides of the pump body (1), one side of the input end cover is a fixed end, and one side of the output end cover is a floating end; The end covers are arranged at both ends of the pump body (1); the driving shaft (11) and the driven shaft (12) are arranged in the pump body (1); the rotor (15) is arranged in a cavity (16) in the pump body (1); a driving gear (13) and a driving rotor are fixedly mounted on the driving shaft (11); a driven gear (13) and a driven rotor are fixedly mounted on the driven shaft (12); and the driving gear (13) and the driven gear (14) are meshed with each other; It is characterized in that A heat-conducting component (17) that fits the shape of the pump body (1) is arranged on the inner surface or the outer surface of the pump body (1); The driven gear (14) is two gears of the same thickness connected in an integral manner, and the offset between the upper and lower gears is the meshing backlash value between the driving gear (13) and the driven gear (14); It also includes a gland (21), an adjustment gasket (28), a corrugated gasket (22) and a locking nut (27); a pair of deep groove ball bearings (20) are respectively installed at both ends of the driving shaft (11) and the driven shaft (12); one end of the inner ring of the deep groove ball bearing (20) located on the fixed end side is fastened to the driving shaft (11) or the driven shaft (12) through a locking nut (27); the other end is connected to the adjustment gasket (28); the outer ring is pressed by the gland (21); and the gland (21) is fixed to the pump body (1) by screws; The inner ring of the deep groove ball bearing (20) located at the floating end is fastened to the driving shaft (11) or the driven shaft (12) via a locking nut (27), and the outer ring is pre-tightened via the corrugated gasket (22) and the gland (21) in sequence, wherein the gland (21) is fixed to the pump body (1) via screws; The processing dimensions of the gland (21) at the movable end satisfy: △ = F 轴 / k 波纹垫片 , Where △ is the gland removal amount, F 轴 is the preload force at the floating end, k 波纹垫片 is the stiffness of the corrugated gasket; The dimensional chain of the axial dimension of the pump body (1) satisfies the following conditions: L 泵体 =L 转子 +δ3+δ4; Δδ=ΔLa-δ4; ΔLa=G 固 +F 轴 / k 固 ; Wherein, ΔLa is the axial displacement of the deep groove ball bearing (20) at the fixed end, G 固 k is the axial clearance of the fixed end deep groove ball bearing (20), 固 is the axial stiffness of the fixed end deep groove ball bearing (20), Δδ is the wear amount of the axial adjustment washer (28), and L 转子 is the length of the rotor (15), L 泵体 is the depth of the pump body (1), δ3 and δ4 are the axial clearances of the floating end and the fixed end respectively, and F axis is the preload force. Here, the floating end uses the gland to deform the corrugated gasket to form a clamping force to compress the outer ring of the floating end bearing; The pump also includes a grinding ring (23), which is attached to both sides of the axial end surface of the rotor (15) and fixed to the pump body (1) by screws, wherein the grinding ring (23) is finely machined after the wear amount and wear direction are accurately measured, and the machining amount of the grinding ring (23) satisfies the relationship: ΔL 磨 =δ3+L 转子 *ΔT Among them, ΔL 磨 L is the machining amount of the grinding ring (23), 转子 is the total length of the rotor (15), and ΔT is the temperature difference between the inside and outside of the rotor (15).

2. The circulating pump according to claim 1, characterized in that: The heat-conducting component (17) comprises a tube body (18) and a heat-conducting cavity (19); the heat-conducting cavity (19) is arranged on the outer surface of the pump body (1) corresponding to the position of the cavity (16); and the tube body (18) is connected to the heat-conducting cavity (19).

3. The circulating pump according to claim 1 or 2, characterized in that: The heat-conducting component (17) is arranged on the inner surface of the pump body (1) by using 3D printing technology.

4. A circulation pump clearance control method for any one of claims 1 to 3, characterized in that: It also includes a gap measuring device (25), a medium temperature measuring device, a rotor temperature measuring device, a conveying device and a data acquisition instrument; The gap control method of the circulating pump comprises the following steps: S1. The gap between the rotor (15) and the pump body (1) is measured by the gap measuring device, and the measurement data is sent to the data acquisition instrument; S2. The temperature of the rotor is measured by the rotor temperature measuring device, and the measurement data is sent to the data acquisition instrument; S3. The gap is analyzed by the data acquisition instrument. If the gap exceeds a reasonable gap value, the conveying device is started to convey the medium to the heat conducting component (17). When the gap value drops to a reasonable range, the conveying device is closed.

5. The control method according to claim 4, characterized in that: In step S2, the rotor temperature measuring device includes a temperature sensor and a conductive slip ring, and the temperature sensor is connected to the data acquisition instrument through the conductive slip ring.

6. The control method according to claim 4, characterized in that: In step S3, the temperature of the medium satisfies the relationship: δ2 = δ 20 +D*(T 介质 -T 转子 )*α, wherein δ2 is the radial clearance between the rotor (15) and the pump body (1), δ 20 is the clearance at room temperature and static state, D is the diameter of the rotor (15), T 转子 is the rotor outer surface temperature, T 介质 is the temperature of the conveying medium, and α is the thermal expansion coefficient of the rotor (15) material.

Images