Internal gear pump shell and internal gear pump

Abstract

The utility model relates to an internal gear pump shell and an internal gear pump, and relates to the technical field of internal gear pumps, the internal gear pump shell comprises a pump shell main body, the pump shell main body is provided with a shaft hole, a gear cavity, a liquid inlet and a liquid outlet, and the shaft hole penetrates through the pump shell main body; the gear cavity is used for installing the inner meshing gear set and communicates with the shaft hole, the liquid inlet and the liquid outlet. Wherein a first branch and a second branch are arranged in the liquid inlet and / or the liquid outlet, the first branch is communicated with one side, in the axial direction of the shaft hole, of the gear cavity, the second branch is communicated with the other side, in the axial direction of the shaft hole, of the gear cavity, and the first branch and the second branch are arranged in the liquid inlet and / or the liquid outlet; liquid is sucked in or squeezed out from the two axial sides of the inner meshing gear set at the same time, vibration and deviation of the inner meshing gear set in the axial direction of the shaft hole are reduced, noise is reduced, and stability and reliability are improved.

Description

Technical Field

[0001] The present application relates to the field of internal gear pumps, and in particular to an internal gear pump housing and a gear pump. Background Art

[0002] The internal gear pump adopts the principle of internal gear meshing. The pitch circles of the inner and outer gears are close to each other, and the other side is separated by a crescent plate. The driving gear on the main shaft drives the outer gear to rotate in the same direction. At the inlet, the gears separate from each other to form a negative pressure to suck in the liquid, and the gears are continuously embedded and meshed at the outlet to squeeze the liquid out.

[0003] With respect to the above-mentioned related technologies, the inventors found that the liquid medium of the existing internal gear pump is sucked or squeezed out from one axial side of the internal gear set, the internal gear set vibrates greatly along the axial direction, and the internal gear set is even prone to axial displacement, which causes the internal gear pump to generate noise and vibration during operation, and has poor operating stability and reliability. Utility Model Content

[0004] In order to solve the above problems, the present application provides an internal gear pump housing and an internal gear pump.

[0005] The internal gear pump housing provided in this application adopts the following technical solution:

[0006] An internal gear pump housing comprises a pump housing body, the pump housing body is provided with an axial hole, a gear cavity, a liquid inlet and a liquid outlet, the axial hole passes through the pump housing body, the gear cavity is used to install an internal gear set and is in communication with the axial hole, the liquid inlet and the liquid outlet;

[0007] Wherein: the liquid inlet and / or the liquid outlet has a first branch and a second branch, the first branch is connected to the gear cavity along one axial side of the shaft hole, and the second branch is connected to the gear cavity along the other axial side of the shaft hole.

[0008] By adopting the above technical solution, the liquid inlet or the liquid outlet is provided with a first branch and a second branch, and the first branch and the second branch are respectively connected to the two axial sides of the gear cavity along the shaft hole, so that at least the internal meshing gear set can simultaneously inhale or squeeze out liquid from both axial sides, reducing the axial imbalance of the gear caused by unilateral inhalation or extrusion, thereby reducing the axial vibration and deviation of the internal meshing gear set, reducing noise, and improving structural stability and reliability;

[0009] When both the liquid inlet and the liquid outlet have the first branch and the second branch, the internal meshing gear set can suck in and squeeze out the liquid from both sides of the axial direction at the same time, and when the liquid inlet and the liquid outlet are used interchangeably, the internal meshing gear set can also satisfy the function of sucking in or squeezing out the liquid from both sides of the axial direction at the same time, thereby ensuring the effect of noise reduction and improving stability and reliability.

[0010] Optionally, the first branch has a first virtual path for liquid flow, and the extension direction of the first virtual path at the connection point between the first branch and the gear cavity is consistent with the axial direction of the shaft hole; the second branch has a second virtual path for liquid flow, and the extension direction of the second virtual path at the connection point between the second branch and the gear cavity is consistent with the axial direction of the shaft hole.

[0011] By adopting the above technical solution, the liquid in the first branch and the second branch flows into or out of the gear cavity along the axial direction of the shaft hole, so as to reduce the force of the liquid on the internal meshing gear set along the axial direction of the vertical shaft hole, thereby reducing the vibration and deviation of the internal meshing gear set along the axial direction of the vertical shaft hole, and further improving the noise reduction and stability and reliability effects.

[0012] Optionally, the first branch and the second branch are arranged along the axial direction of the shaft hole.

[0013] By adopting the above technical solution, the first branch and the second branch are arranged along the axial distribution of the shaft hole to reduce the axial misalignment of the liquid in the first branch and the second branch along the shaft hole when the liquid is sucked in or squeezed out, thereby reducing the torque effect on the internal meshing gear set when the liquid is sucked in or squeezed out, and improving stability.

[0014] Optionally, along the axial direction of the shaft hole, the connection point between the first branch and the gear chamber is directly opposite to the connection point between the second branch and the gear chamber.

[0015] By adopting the above technical solution, along the axial direction of the shaft hole, the connecting point between the first branch and the gear cavity is opposite to the connecting point between the second branch and the gear cavity, which can also reduce the axial misalignment along the shaft hole when the liquid in the first branch and the second branch is sucked or squeezed out, thereby reducing the torque effect on the internal meshing gear set when the liquid is sucked or squeezed out, thereby improving stability.

[0016] Optionally, a cross section of the first branch along the liquid flow direction is smaller than a cross section of the second branch.

[0017] By adopting the above technical solution, the cross-section of the first branch is smaller than the cross-section of the second branch, so that the liquid flow rate flowing in the first branch is smaller than the liquid flow rate flowing in the second branch, so that the force exerted by the liquid flowing in the first branch on the internal meshing gear set is smaller than the force exerted by the liquid flowing in the second branch on the internal meshing gear set, so as to balance the deadweight of the internal meshing gear set and improve stability.

[0018] Optionally, the pump casing main body includes a pump cover and a pump body that are detachably fixedly connected. After the pump cover is connected to the pump body, the pump cover and the pump body form a gear cavity.

[0019] By adopting the above technical solution, the pump casing body is detachably installed through the pump cover and the pump body, and the gear cavity is surrounded by the pump cover and the pump body, which is convenient for the installation of the internal meshing gear set.

[0020] Optionally, the pump housing body has a crescent plate located in the gear cavity, wherein:

[0021] The crescent plate is fixedly connected to the pump cover, and after the pump cover is connected to the pump body, the crescent plate abuts against the pump body;

[0022] Alternatively, the crescent plate is fixedly connected to the pump body, and after the pump cover is connected to the pump body, the crescent plate abuts against the pump cover.

[0023] By adopting the above technical solution, the crescent plate can be fixed to the pump cover or the crescent plate can be fixed to the pump body according to production needs, and the production and manufacturing are flexible and diverse.

[0024] Optionally, the pump cover and the pump body are disassembled and installed along the axial direction of the shaft hole, and the first branch is located in the pump cover and the second branch is located in the pump body, or the first branch is located in the pump body and the second branch is located in the pump cover.

[0025] By adopting the above technical solution, the first branch and the second branch are respectively arranged on the pump cover and the pump body, which facilitates the processing, cleaning and maintenance of the first branch and the second branch.

[0026] Optionally, the angle between the liquid inlet and the liquid outlet relative to the axis of the shaft hole is in the range of 90° to 180°.

[0027] By adopting the above technical solution, the angle range between the liquid inlet and the liquid outlet relative to the axis of the shaft hole is set between 90° and 180°, so that the flow direction of the liquid entering from the liquid inlet and being squeezed out from the liquid outlet is roughly consistent, reducing liquid flow loss.

[0028] The present application also discloses an internal gear pump adopting the following technical solution:

[0029] An internal gear pump comprises the internal gear pump housing as described above.

[0030] By adopting the above technical solution, the internal gear pump casing is applied to the internal gear pump, thereby reducing the noise of the entire internal gear pump during operation and improving the stability and reliability of the pump.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. In the present application, the liquid inlet and / or the liquid outlet has a first branch and a second branch, and the liquid is sucked or squeezed out from both axial sides of the internal meshing gear set at the same time, thereby reducing the vibration and deviation of the internal meshing gear set along the axial direction of the shaft hole, reducing noise and improving stability and reliability;

[0033] 2. In a further configuration of the present application, at the connection between the first branch and the second branch and the gear cavity, the first virtual path and the second virtual path are both consistent with the axial direction of the shaft hole, so as to reduce the force acting on the vertical axis direction of the internal gear set when the liquid is sucked in or squeezed out, thereby improving the stability of the internal gear set along the vertical axis direction;

[0034] 3. In a further arrangement of the present application, by distributing the first branch and the second branch along the axial direction of the shaft hole, and arranging the connecting point between the first branch and the gear cavity opposite to the connecting point between the second branch and the gear cavity along the axial direction of the shaft hole, the axial misalignment of the liquid in the first branch and the second branch along the shaft hole when being sucked in or squeezed out is reduced, thereby reducing the torque effect on the internal meshing gear set when the liquid is sucked in or squeezed out, thereby improving stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a three-dimensional structural schematic diagram of an internal gear pump housing;

[0036] Figure 2 yes Figure 1 Schematic diagram of a three-dimensional cross section;

[0037] Figure 3 yes Figure 1 Schematic diagram of an explosion, in which the pump cover is a schematic diagram after being turned upside down;

[0038] Figure 4 yes Figure 1 A side cross-sectional schematic diagram of ;

[0039] Figure 5 It is a partial cross-sectional view of the internal gear pump housing, the internal gear set and the main shaft.

[0040] Explanation of the accompanying drawings: 1. Pump casing body; 2. Shaft hole; 3. Gear chamber; 4. Liquid inlet; 5. Liquid outlet; 6. First branch; 7. Second branch; 8. First virtual path; 9. Second virtual path; 10. Pump cover; 11. Pump body; 12. Crescent plate. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various configurations. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0043] 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 an indirect connection through an intermediate medium, and 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.

[0044] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0045] The following is combined with Figure 1-4 This application is described in further detail.

[0046] An embodiment of the present application discloses an internal gear pump casing, which has an axial hole 2, a gear cavity 3, a liquid inlet 4 and a liquid outlet 5 on its pump casing main body 1, the axial hole 2 passes through the pump casing main body 1, the gear cavity 3 is used to install an internal gear set and is connected to the axial hole 2, the liquid inlet 4 and the liquid outlet 5, wherein the liquid inlet 4 and / or the liquid outlet 5 have a first branch 6 and a second branch 7, the first branch 6 is connected to the gear cavity 3 along one axial side of the axial hole 2, and the second branch 7 is connected to the gear cavity 3 along the other axial side of the axial hole 2.

[0047] In this embodiment, the liquid inlet 4 is located on the left side of the axial hole 2, and the liquid outlet 5 is located on the right side of the axial hole 2. The angle formed by the liquid inlet 4 and the liquid outlet 5 relative to the axis of the axial hole 2 is in the range of 90°~180°, so that the liquid inlet flow direction and the liquid outlet flow direction are basically consistent, reducing the liquid kinetic energy loss caused by the change of liquid flow direction. Of course, without considering the kinetic energy loss, the angle formed by the liquid inlet 4 and the liquid outlet 5 relative to the axis of the axial hole 2 can be set based on the actual needs of the liquid flow direction. Common angles are 90°, 180°, and 270°.

[0048] The liquid inlet 4 and the liquid outlet 5 are both provided with a first branch 6 and a second branch 7. The shaft hole 2 penetrates the pump housing body 1 in the up-down direction. The first branch 6 is connected to the gear chamber 3 from the upper side, and the second branch 7 is connected to the gear chamber 3 from the lower side. Since the shaft hole 2 penetrates in the up-down direction, the axis direction of the main shaft used to connect the internal gear set is also in the up-down direction, and the gear axis of the internal gear set is also in the up-down direction. In practical applications, the liquid inlet 4 and the liquid outlet 5 can be used interchangeably according to the rotation direction of the internal gear set.

[0049] The liquid enters from the liquid inlet 4, part of the liquid enters into the gear chamber 3 from the upper side through the first branch 6 at the liquid inlet 4 and is sucked by the internal meshing gear set, the liquid has a downward thrust on the internal meshing gear set, the other liquid enters into the gear chamber 3 from the lower side through the second branch 7 at the liquid inlet 4 and is sucked by the internal meshing gear set, the liquid has an upward thrust on the internal meshing gear set to balance the downward thrust of the liquid on the internal meshing gear set, so that the internal meshing gear set tends to be stable in the up and down directions, so as to reduce the vibration and deviation of the internal meshing gear set in the up and down directions, reduce noise and improve stability and reliability.

[0050] The installation of the internal meshing gear set and the main shaft can adopt the installation connection method of the internal meshing gear set and the main shaft in the Chinese utility model patent with publication number CN220687574U, and the patent name is "A gear oil pump", which will not be repeated here.

[0051] The pump casing body 1 includes a pump cover 10 and a pump body 11 that are detachably fixedly connected, and bolts are usually used for fastening and installation. After the pump cover 10 is connected to the pump body 11, the pump cover 10 and the pump body 11 enclose a gear cavity 3, and the detachable connection between the pump cover 10 and the pump body 11 facilitates the installation of the internal meshing gear set into the gear cavity 3. In this embodiment, the gear cavity 3 is opened upward in the pump body 11, and after the internal meshing gear set is installed in the gear cavity 3, the pump cover 10 is installed on the pump body 11, and the gear cavity 3 is closed.

[0052] The pump housing body 1 is provided with a crescent plate 12 located in the gear cavity 3, which mainly plays the role of regulating flow and sealing. In this embodiment, the crescent plate 12 is fixed in the pump body 11, and after the pump cover 10 is connected to the pump body 11, the crescent plate 12 abuts against the pump cover 10. The crescent plate 12 can be integrally formed with the pump body 11, or fixedly connected by later welding or other methods. In other embodiments, the crescent plate 12 can also be fixed to the pump body 11, and after the pump cover 10 is connected to the pump body 11, the crescent plate 12 abuts against the pump body 11. Similarly, the crescent plate 12 and the pump cover 10 can be integrally formed or fixed by welding.

[0053] The pump cover 10 and the pump body 11 are disassembled and installed along the axial direction of the shaft hole 2. The gear cavity 3 is located in the pump body 11, and the first branch 6 and the second branch 7 need to be connected to the gear cavity 3 along the axial sides of the shaft hole 2, respectively. Therefore, the first branch 6 and the second branch 7 need to be located in the pump cover 10 and the pump body 11, respectively. In this embodiment, the first branch 6 is located in the pump cover 10, and the second branch 7 is located in the pump body 11. The pump cover 10 and the pump body 11 are both provided with a liquid inlet 4 and a liquid outlet 5. After the pump cover 10 is connected to the pump body 11, the liquid inlet 4 in the pump cover 10 is connected to the liquid inlet 4 in the pump body 11, and the liquid outlet 5 in the pump cover 10 is connected to the liquid outlet 5 in the pump body 11. In other embodiments, the first branch 6 is located in the pump body 11, and the second branch 7 is located in the pump cover 10.

[0054] For the first branch 6 and the second branch 7, the paths of liquid flow are represented by virtual paths and further explained: specifically, the first branch 6 has a first virtual path 8 for liquid flow, and the second branch 7 has a second virtual path 9 for liquid flow, the extension direction of the first virtual path 8 at the connection point between the first branch 6 and the gear chamber 3 is consistent with the axial direction of the shaft hole 2, and the extension direction of the second virtual path 9 at the connection point between the second branch 7 and the gear chamber 3 is consistent with the axial direction of the shaft hole 2. That is, when the liquid in the first branch 6 and the second branch 7 in the liquid inlet 4 flows into the gear chamber 3, it flows in along the axial direction of the shaft hole 2, and the pushing force of the liquid on the internal meshing gear set along the axial direction perpendicular to the shaft hole 2 is minimized, and the radial vibration and offset of the internal meshing gear set are reduced; similarly, when the liquid in the first branch 6 and the second branch 7 in the liquid outlet 5 is squeezed out from the gear chamber 3, it flows out along the axial direction of the shaft hole 2, and the attraction force of the liquid on the internal meshing gear set along the axial direction perpendicular to the shaft hole 2 is minimized, which can also achieve the effect of reducing the radial vibration and offset of the internal meshing gear set.

[0055] In a further configuration, the first branch 6 and the second branch 7 are distributed along the axial direction of the shaft hole 2 to reduce the misalignment of the liquid flow in the first branch 6 and the second branch 7 along the axial direction of the shaft hole 2; along the axial direction of the shaft hole 2, the connecting point between the first branch 6 and the gear chamber 3 is arranged opposite to the connecting point between the second branch 7 and the gear chamber 3 to reduce the misalignment of the liquid flow in the first branch 6 and the second branch 7 along the radial direction of the shaft hole 2.

[0056] Specifically, taking the first branch 6 and the second branch 7 in the liquid inlet 4 as an example, when the first branch 6 and the second branch 7 in the liquid inlet 4 are misaligned in the axial direction along the shaft hole 2, the liquid in the first branch 6 has a downward thrust F1 on the internal meshing gear set, and the liquid in the second branch 7 has an upward thrust F2 on the internal meshing gear set. The extension lines of the forces of F1 and F2 are staggered and the directions of the forces are opposite, so that F1 and F2 generate torque on the internal meshing gear set, affecting the effect of the gear transmission and reducing the structural stability and reliability.

[0057] Similarly, when the first branch 6 and the second branch 7 in the liquid inlet 4 are misaligned in the radial direction along the axial hole 2, the force exerted by the liquid in the first branch 6 and the liquid in the second branch 7 on the internal meshing gear set will also generate torque on the internal meshing gear set, affecting the effect of the gear transmission.

[0058] Distributing the first branch 6 and the second branch 7 along the axial direction of the shaft hole 2 and arranging the connection between the first branch 6 and the gear chamber 3 and the connection between the second branch 7 and the gear chamber 3 opposite to each other can reduce the above negative effects.

[0059] In actual application, the internal meshing gear set will also shift in the axial direction under its own action, especially when the axial direction of the shaft hole 2 is consistent with the vertical direction of gravity. Therefore, based on the actual application situation, the cross-section of the first branch 6 along the liquid flow direction and the cross-section of the second branch 7 can be set accordingly.

[0060] In this embodiment, the first branch 6 is located on the pump cover 10, and the second branch 7 is located in the pump body 11. The cross-section of the first branch 6 along the liquid flow direction is smaller than the cross-section of the second branch 7. The force exerted by the liquid in the first branch 6 on the internal meshing gear set is F1, and the force exerted by the liquid in the second branch 7 on the internal meshing gear set is F2. F2 is greater than F1 to balance the deadweight of the internal meshing gear set.

[0061] The present application also provides an internal gear pump, which adopts the above-mentioned internal gear pump housing to achieve noise reduction, stability and reliability effects.

[0062] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An internal gear pump housing, characterized in that: The pump casing comprises a pump casing body (1), wherein the pump casing body (1) is provided with an axial hole (2), a gear cavity (3), a liquid inlet (4) and a liquid outlet (5), wherein the axial hole (2) passes through the pump casing body (1), and the gear cavity (3) is used for mounting an internal meshing gear set and is in communication with the axial hole (2), the liquid inlet (4) and the liquid outlet (5); The liquid inlet (4) and / or the liquid outlet (5) comprises a first branch (6) and a second branch (7), the first branch (6) being connected to the gear cavity (3) along one axial side of the shaft hole (2), and the second branch (7) being connected to the gear cavity (3) along the other axial side of the shaft hole (2).

2. The internal gear pump housing according to claim 1, characterized in that: The first branch (6) has a first virtual path (8) for liquid flow, and the extension direction of the first virtual path (8) at the connection point between the first branch (6) and the gear chamber (3) is consistent with the axial direction of the shaft hole (2); the second branch (7) has a second virtual path (9) for liquid flow, and the extension direction of the second virtual path (9) at the connection point between the second branch (7) and the gear chamber (3) is consistent with the axial direction of the shaft hole (2).

3. The internal gear pump housing according to claim 1, characterized in that: The first branch (6) and the second branch (7) are arranged along the axial direction of the shaft hole (2).

4. The internal gear pump housing according to claim 1, characterized in that: Along the axial direction of the shaft hole (2), the connection point between the first branch (6) and the gear chamber (3) is directly opposite to the connection point between the second branch (7) and the gear chamber (3).

5. The internal gear pump housing according to claim 1, characterized in that: The cross section of the first branch (6) along the liquid flow direction is smaller than the cross section of the second branch (7).

6. The internal gear pump housing according to claim 1, characterized in that: The pump casing main body (1) comprises a pump cover (10) and a pump body (11) which are detachably fixedly connected. After the pump cover (10) and the pump body (11) are connected, the pump cover (10) and the pump body (11) enclose the gear chamber (3).

7. The internal gear pump housing according to claim 6, characterized in that: The pump housing body (1) has a crescent plate (12) located in the gear cavity (3), wherein: The crescent plate (12) is fixedly connected to the pump cover (10), and after the pump cover (10) is connected to the pump body (11), the crescent plate (12) abuts against the pump body (11); Alternatively, the crescent plate (12) is fixedly connected to the pump body (11), and after the pump cover (10) is connected to the pump body (11), the crescent plate (12) abuts against the pump cover (10).

8. The internal gear pump housing according to claim 6, characterized in that: The pump cover (10) and the pump body (11) are disassembled and installed along the axial direction of the shaft hole (2), and the first branch (6) is located in the pump cover (10) and the second branch (7) is located in the pump body (11), or the first branch (6) is located in the pump body (11) and the second branch (7) is located in the pump cover (10).

9. The internal gear pump housing according to claim 1, characterized in that: The angles formed by the liquid inlet (4) and the liquid outlet (5) relative to the axis of the axial hole (2) are in the range of 90° to 180°.

10. An internal gear pump, characterized in that: Comprising an internal gear pump housing as claimed in any one of claims 1 to 9.

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