Internal gear pump with protection function

Abstract

The utility model relates to an internal gear pump with a protection function. A plurality of supporting plates are arranged on a support, a driving motor comprises a motor shell and an output shaft, a pump body is arranged at one end of the output shaft, an input pipe and an output pipe are arranged on the pump body, a sealing end cover is arranged in the pump body, and the sealing end cover and the pump body form a conveying cavity; a cooling cavity is formed in one side of the conveying cavity, a cooling liquid input end and a cooling liquid output end are arranged at the two ends of the conveying cavity, an inner gear, an outer gear ring and a crescent plate are arranged in the conveying cavity, the outer gear ring is connected with the output shaft, and the crescent plate comprises an upper arc plate and a lower arc plate. Heat generated when the inner gear and the outer gear ring rotate at a high speed is taken away, the overall temperature rise and accelerated abrasion caused by the temperature rise of the inner gear and the outer gear ring are prevented, the inner gear and the outer gear ring can be meshed more accurately through the compensation spring, elastic compensation is provided, interference fit of the inner gear and the outer gear ring is prevented, and abrasion aggravation is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of gear pumps, and in particular to an internal gear pump with a protective function. 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 cylinder and the meshing gears to transport liquid or increase its pressure.

[0003] An internal gear pump consists of two meshing gears, one large and one small, a crescent plate, and a pump body. The input and output ports form two enclosed chambers. As the gears rotate, the volume of the space on the side where the gears are engaged increases from small to large, creating a vacuum that draws liquid in. The volume of the space on the side where the gears are engaged decreases, squeezing the liquid into the pipeline. The suction and discharge chambers are separated by the meshing line of the two gears. The pressure at the discharge port of a gear pump is entirely dependent on the resistance at the pump outlet.

[0004] Currently, due to the high speed of the internal gear pump, the friction between the gears inside it generates heat quickly, which will cause the internal components to expand due to heat, and the gaps between the originally just meshing internal gear, crescent plate and outer gear ring will change, and the original just clearance fit will be changed to an interference fit, which will increase the wear of each gear. The gear design in the internal gear pump is high in precision and costly. Therefore, it is necessary to improve the traditional internal gear pump to address this problem and design an internal gear pump with protective function. Utility Model Content

[0005] Based on this, it is necessary to propose an internal gear pump with protection function to address the shortcomings of the heat dissipation performance and safety protection performance of traditional gear pumps.

[0006] The present application provides an internal gear pump with a protective function, comprising:

[0007] A bracket, wherein a plurality of support plates are provided on the bracket;

[0008] A drive motor, the drive motor being arranged on a support plate at one end of the bracket, the drive motor comprising a motor housing and an output shaft;

[0009] A pump body, the pump body being arranged at one end of the output shaft, the pump body being provided with an inlet pipe and an outlet pipe, the pump body being provided with a sealing end cover, the sealing end cover and the pump body forming a delivery cavity;

[0010] An internal gear, an external gear ring and a crescent plate are provided in the conveying cavity. The external gear ring is connected to the output shaft. The sealing end cover is provided with an internal gear shaft. The internal gear is sleeved on the internal gear shaft. The crescent plate includes an upper arc plate and a lower arc plate.

[0011] A cooling end cover is provided on the side of the sealing end cover away from the conveying cavity. The cooling end cover, the sealing end cover and the pump body are sealed to form a cooling cavity. A coolant input end and a coolant output end are provided on the cooling end cover.

[0012] Preferably, in the conveying chamber: the crescent plate is fixed on the sealing end cover, the highest end of the inner gear is meshed with the outer gear ring, the lowest end of the inner gear is against the upper arc plate, the gear part of the outer gear ring is against the lower arc plate, and the crescent plate separates the conveying chamber into a negative pressure suction chamber and a high pressure output chamber.

[0013] Preferably, the input pipe is connected to the negative pressure suction chamber, and the output pipe is connected to the high pressure output chamber.

[0014] Preferably, the angle between the input pipe and the output pipe is ninety degrees, or the angle between the input pipe and the output pipe is one hundred and eighty degrees.

[0015] Preferably, the internal gear includes an internal tooth body and a plurality of external teeth, the external teeth are arranged in sequence at equal intervals, and the arc shape of the upper arc plate is the same as the moving trajectory of the highest end of each external tooth.

[0016] Preferably, the outer gear ring includes an annular ring and a plurality of inner gears arranged on the annular ring, each outer tooth can engage with any inner gear, and the arc shape of the lower arc plate is the same as the moving trajectory of the highest end of the inner gear.

[0017] Preferably, the pump body also includes a rear end cover, the outer gear ring is rotatably connected to the rear end cover, the output shaft passes through the rear end cover and rotatably cooperates with the outer gear ring, and a residual compensation spring is also provided in the rear end cover, one end of the residual compensation spring rests on the rear end cover.

[0018] Preferably, the cooling chamber stores a coolant, and the coolant circulates through a coolant input end and a coolant output end.

[0019] Preferably, a pin sleeve is provided at the connection between the internal gear shaft and the internal gear body.

[0020] Preferably, the pump body is further provided with a pressure gauge, and the pressure gauge is connected to the high-pressure output chamber.

[0021] Technical advantages of this application:

[0022] 1. The utility model sets a cooling chamber on one side of the conveying chamber, and circulates the coolant through the coolant input and coolant output ports to remove the heat generated by the high-speed rotation of the inner gear and the outer gear ring, thereby preventing the overall temperature from rising and preventing the accelerated wear of the inner gear and the outer gear ring caused by the temperature increase, thereby playing a protective role;

[0023] 2. The compensation spring can make the inner gear and outer gear ring engage more accurately, provide elastic compensation, prevent the inner gear and outer gear ring from interference fit, and avoid increased wear;

[0024] 3. Set up a pressure gauge to monitor the maximum pressure in the internal high-pressure chamber in real time. If the pressure is too high, it is necessary to stop operation and repair in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of this application are used to provide a further understanding of this application and make other features, purposes and advantages of this application more apparent. The drawings and descriptions of the exemplary embodiments of this application are used to explain this application and do not constitute an improper limitation on this application.

[0026] Figure 1 A three-dimensional structural diagram of an internal gear pump provided in one embodiment of the present application.

[0027] Figure 2 A side view of an internal gear pump provided in accordance with an embodiment of the present application.

[0028] Figure 3 This is a rear view of the internal gear pump provided in one embodiment of the present application.

[0029] Figure 4 A schematic cross-sectional view of the overall structure provided in one embodiment of the present application.

[0030] Figure 5 This is a schematic diagram of the structure inside the delivery cavity provided in one embodiment of the present application.

[0031] Figure numerals: conveying chamber 100; negative pressure suction chamber 110; high pressure output chamber 120; cooling chamber 200; bracket 1; support plate 11; drive motor 2; motor housing 21; output shaft 22; pump body 3; input pipe 31; output pipe 32; sealing end cover 33; rear end cover 34; residual compensation spring 35; internal gear 4; internal gear shaft 40; internal gear body 41; external gear 42; pin sleeve 43; external gear ring 5; annular ring 51; internal gear 52; crescent plate 6; upper arc plate 61; lower arc plate 62; cooling end cover 7; coolant input end 71; coolant output end 72; pressure gauge 8. DETAILED DESCRIPTION

[0032] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in combination with the accompanying drawings by way of examples.

[0033] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0034] In addition, in the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In this utility model, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integration; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or an interaction between two components. However, the phrase "direct connection" indicates that the two connected entities are not connected through an intermediate structure, but are connected to form a whole through a connecting structure. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0036] like Figures 1 to 5 As shown, the present application provides an internal gear pump with a protective function.

[0037] In one embodiment of the present application

[0038] like Figure 1-Figure 2 As shown: an internal gear pump with a protective function, comprising: a bracket 1, a drive motor 2 and a pump body 3, wherein the entire drive motor 2 and the pump body 3 are arranged on a horizontal bracket 1.

[0039] Specifically, the bracket 1 is a horizontal metal plate, and two support plates 11 are provided on the bracket 1. The two support plates 11 respectively clamp the drive motor 2 and fix the drive motor 2 with screws;

[0040] like Figure 2-Figure 3 As shown: the drive motor 2 used in the present invention is a servo motor, which is arranged on a support plate 11 at one end of a bracket 1, and a pump body 3 is arranged at the other end of the bracket 1. The drive motor 2 includes a motor housing 21 and an output shaft 22. The output shaft 22 of the drive motor 2 rotates with the pump body 3 to drive the operation of the pump body 3;

[0041] As an improvement of the present invention, the pump body 3 is arranged at one end of the output shaft 22, and an input pipe 31 and an output pipe 32 are arranged on the pump body 3. The input pipe 31 and the output pipe 32 are not fixed, and change according to the rotation direction of the drive motor 2. The main basis is that the side where the gears are engaged and separated is the end where negative pressure is sucked in, which is defined as the input end, that is, the end where the input pipe 31 is located, and the end where the gears start to engage is the end where high pressure is extruded, which is defined as the output end, that is, the end where the output pipe 32 is located. In the present invention, the reverse rotation of the output shaft 22 of the drive motor 2 is counterclockwise rotation, so the left side is set as the input pipe 31 and the top is set as the output pipe 32.

[0042] The pump body 3 of the present invention is provided with a sealing end cover 33 , and the sealing end cover 33 and the pump body 3 form a delivery cavity 100 , in which the internal gear 4 , the external gear ring 5 and the crescent plate 6 are provided.

[0043] Among them, the outer ring gear 5 is connected to the output shaft 22, and the power of the driving motor 2 directly drives the outer ring gear 5 to rotate through the output shaft 22. The outer ring gear 5 is the driving wheel, and the inner gear 4 meshing with the outer ring gear 5 is the driven wheel.

[0044] like Figure 4-Figure 5 As shown, an internal gear shaft 40 is provided on the sealing end cover 33 , the internal gear 4 is sleeved on the internal gear shaft 40 , the internal gear 4 rotates on the internal gear shaft 40 , and the crescent plate 6 includes an upper arc plate 61 and a lower arc plate 62 .

[0045] A pin sleeve 43 is provided at the connection between the internal gear shaft 40 and the internal gear body 41. By providing the pin sleeve 43, the internal gear 4 can be protected, friction can be reduced, the service life of the internal gear 4 can be extended, and the noise generated by friction vibration of the pump can be reduced.

[0046] The inner gear 4 and the outer gear ring 5 are not coaxially arranged, and the radius of the inner gear 4 is smaller than that of the outer gear ring 5 .

[0047] In the conveying chamber 100: the crescent plate 6 is fixed on the sealing end cover 33, and the crescent plate 6 and the sealing end cover 33 are welded or integrally formed. The highest end of the internal gear 4 is engaged with the outer ring gear 5, and the lowest end of the internal gear 4 is against the upper arc plate 61. The gear of the outer ring gear 5 is against the lower arc plate 62. With the internal gear 4 and the outer ring gear 5 respectively abutting against the upper and lower ends of the crescent plate, the crescent plate 6 divides the conveying chamber 100 into a negative pressure suction chamber 110 and a high pressure output chamber 120.

[0048] The input pipe 31 is connected to the negative pressure suction chamber 110, and the output pipe 32 is connected to the high pressure output chamber 120. The transport medium enters the negative pressure suction chamber 110 from the input pipe 31. The negative pressure suction chamber 110 is transferred by the rotation of the gears, and is squeezed by the gears to change into the high pressure output chamber 120 and squeezed into the output pipe 32, thereby completing the high pressure transmission.

[0049] The internal gear 4 includes an internal tooth body 41 and a plurality of external teeth 42 . The external teeth 42 are arranged in sequence at equal intervals. The arc shape of the upper arc plate 61 is the same as the moving trajectory of the highest end of each external tooth 42 . In this way, during the rotation of the upper arc plate 61, the outer teeth 42 can keep the negative pressure suction chamber 110 and the high pressure output chamber 120 in a separated state on both sides of the inner gear 4. At the same time, the outer gear ring 5 includes an annular ring 51 and a plurality of inner teeth 52 arranged on the annular ring 51. Each outer tooth 42 can mesh with any inner tooth 52 gear. The arc shape of the lower arc plate 62 is the same as the moving trajectory of the highest end of the inner teeth 52. The inner teeth 52 can always maintain abutment on the lower arc plate 62, which can keep the negative pressure suction chamber 110 and the high pressure output chamber 120 in a separated state on both sides of the outer gear ring 5. Through the abutment between the inner gear 4 and the upper arc plate 61, the meshing of the inner gear 4 and the outer gear ring 5, and the abutment between the outer gear ring 5 and the lower arc plate 62, the cooperation of the three can make the negative pressure suction chamber 110 and the high pressure output chamber 120 always in an isolated state, transfer the negative pressure suction chamber 110 to the high pressure output chamber 120, and enable continuous circulation and transportation.

[0050] In order to solve the heating problem during the continuous and rapid rotation of the gear, a cooling end cover 7 is provided on the side of the sealing end cover 33 away from the conveying chamber 100. The cooling end cover 7, the sealing end cover 33 and the pump body 3 are sealed to form a cooling chamber 200. The cooling end cover 7 is provided with a coolant input end 71 and a coolant output end 72. Coolant is stored in the cooling chamber 200, and the coolant circulates through the coolant input end 71 and the coolant output end 72.

[0051] The pump body 3 also includes a rear end cover 34, and the outer gear ring 5 is rotatably connected to the rear end cover 34. The output shaft 22 passes through the rear end cover 34 and rotatably cooperates with the outer gear ring 5. In order to ensure that the inner teeth 52, the outer teeth 42 and the crescent plate always maintain a state of efficient meshing and isolation, a margin compensation spring 35 is also provided in the rear end cover 34. One end of the margin compensation spring 35 rests on the rear end cover 34 and is squeezed by the margin compensation spring to maintain a balanced state during the rotation of the gear. If wear occurs, the spring is squeezed to always maintain isolation and just meshing. If heat is generated or there is an interference fit, the spring will be squeezed to reduce wear.

[0052] A pressure gauge 8 is also provided on the pump body 3, and the pressure gauge 8 is connected to the high-pressure output chamber 120. The pressure gauge 8 can monitor the maximum pressure in the internal high-pressure chamber in real time. If the pressure is too high, it is necessary to stop the operation and conduct timely maintenance.

[0053] The utility model sets a cooling chamber on one side of the conveying chamber, and circulates the coolant through the coolant input end and the coolant output end, so as to take away the heat generated by the internal gear and the outer gear ring when they rotate at high speed, thereby preventing the overall temperature from rising and the accelerated wear of the internal gear and the outer gear ring caused by the temperature increase; the compensation spring is set to make the internal gear and the outer gear ring more accurately meshed, provide elastic compensation, prevent the internal gear and the outer gear ring from interference fit, and avoid aggravated wear; the pressure gauge is set to monitor the maximum pressure in the internal high-pressure chamber in real time. If the pressure is too high, it is necessary to stop operation and timely maintenance.

[0054] The various technical features of the above-described embodiments can be combined arbitrarily, and the execution order of the method steps is not restricted. In order to make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. An internal gear pump with a protective function, comprising: A bracket (1), wherein a plurality of support plates (11) are arranged on the bracket (1); A drive motor (2), the drive motor (2) being arranged on a support plate (11) at one end of the bracket (1), the drive motor (2) comprising a motor housing (21) and an output shaft (22); A pump body (3), the pump body being arranged at one end of the output shaft (22), an input pipe (31) and an output pipe (32) being arranged on the pump body (3), a sealing end cover (33) being arranged inside the pump body (3), and the sealing end cover (33) and the pump body (3) forming a conveying chamber (100); An internal gear (4), an external gear ring (5) and a crescent plate (6) are arranged in the conveying chamber (100); the external gear ring (5) is connected to the output shaft (22); an internal gear rotating shaft (40) is arranged on the sealing end cover (33); the internal gear (4) is sleeved on the internal gear rotating shaft (40); and the crescent plate (6) comprises an upper arc plate (61) and a lower arc plate (62); the characteristics are as follows: A cooling end cover (7) is provided on a side of the sealing end cover (33) away from the conveying chamber (100); the cooling end cover (7), the sealing end cover (33) and the pump body (3) are sealed to form a cooling chamber (200); and a cooling liquid input end (71) and a cooling liquid output end (72) are provided on the cooling end cover (7).

2. The internal gear pump with protective function according to claim 1, characterized in that: In the delivery chamber (100), the crescent plate (6) is fixed on the sealing end cover (33), the highest end of the internal gear (4) is meshed with the outer gear ring (5), the lowest end of the internal gear (4) is in contact with the upper arc plate (61), the gear portion of the outer gear ring (5) is in contact with the lower arc plate (62), and the crescent plate (6) divides the delivery chamber (100) into a negative pressure suction chamber (110) and a high pressure output chamber (120).

3. The internal gear pump with protective function according to claim 2, characterized in that: The input pipe (31) is connected to the negative pressure suction chamber (110), and the output pipe (32) is connected to the high pressure output chamber (120).

4. The internal gear pump with protective function according to claim 3, characterized in that: The angle between the input pipe (31) and the output pipe (32) is ninety degrees, or the angle between the input pipe (31) and the output pipe (32) is one hundred and eighty degrees.

5. The internal gear pump with protective function according to claim 4, characterized in that: The internal gear (4) comprises an internal tooth body (41) and a plurality of external teeth (42), the external teeth (42) being arranged in sequence at equal intervals, and the arc shape of the upper arc plate (61) is the same as the moving trajectory of the highest end of each external tooth (42).

6. The internal gear pump with protective function according to claim 5, characterized in that: The outer gear ring (5) comprises an annular ring (51) and a plurality of inner teeth (52) arranged on the annular ring (51), each outer tooth (42) can mesh with any inner tooth (52) gear, and the arc shape of the lower arc plate (62) is the same as the moving trajectory of the highest end of the inner teeth (52).

7. The internal gear pump with protective function according to claim 6, characterized in that: The pump body (3) further comprises a rear end cover (34), the outer gear ring (5) being rotatably engaged with the rear end cover (34), the output shaft (22) passing through the rear end cover (34) and then rotatably engaging with the outer gear ring (5), and a residual compensation spring (35) is further provided in the rear end cover (34), one end of the residual compensation spring (35) being in contact with the rear end cover (34).

8. The internal gear pump with protective function according to claim 7, characterized in that: The cooling cavity (200) stores cooling liquid, and the cooling liquid circulates through a cooling liquid input end (71) and a cooling liquid output end (72).

9. The internal gear pump with protective function according to claim 8, characterized in that: A pin sleeve (43) is provided at the connection between the internal gear rotating shaft (40) and the internal gear body (41).

10. The internal gear pump with protection function according to claim 9, characterized in that: The pump body (3) is also provided with a pressure gauge (8), and the pressure gauge (8) is connected to the high-pressure output chamber (120).

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