CN209990629U

CN209990629U - Gear pump capable of preventing liquid from flowing back

Info

Publication number: CN209990629U
Application number: CN201920077048.0U
Authority: CN
Inventors: 车林波; 涂世扬
Original assignee: Shenzhen Zhuangzhi Technology Co
Current assignee: Shenzhen Zhuangzhi Technology Co
Priority date: 2019-01-17
Filing date: 2019-01-17
Publication date: 2020-01-24
Anticipated expiration: 2029-01-17

Abstract

The utility model belongs to the technical field of gear pumps, and relates to a gear pump for preventing liquid from flowing back, which comprises a shell and a gear assembly positioned in the shell, wherein the gear assembly comprises an inner gear and an outer gear arranged outside the inner gear, and the number of the outer teeth of the inner gear is one less than that of the inner teeth of the outer gear; the gear assembly is connected with a rotating shaft which drives the gear assembly to rotate; the casing includes base and upper cover, one side that the upper cover is close to the base is equipped with the step face, the surrounding sealing washer that is equipped with around the step face. The utility model discloses after the pivot stall, internal gear and outer gear between its feeding guiding gutter and the ejection of compact guiding gutter have at least a pair of tooth to be in the interlock state, can effectively block the liquid reflux to play the function of lock pressure.

Description

Gear pump capable of preventing liquid from flowing back

Technical Field

The utility model belongs to the technical field of the gear pump, a prevent gear pump of liquid reflux is related to.

Background

In the existing foaming equipment and the like, a pneumatic pump device taking a cylinder pump head as power is often adopted in a pumping device for transmitting liquid and locking pressure. The following problems exist in the selection of pneumatic pump devices: firstly, the foaming equipment adopts the air cylinder, liquid transmission is realized by pushing the air cylinder to act and then extracting the liquid, the air cylinder is unstable due to the size of air supply pressure, the action speed of the air cylinder is influenced, the liquid cannot reach stable pressure during supply and transmission, the effect of each production is inconsistent, and the control cannot be accurate; secondly, when the air supply is stopped, the pump head has no air pressure instantly, the liquid in the pipe flows back because the liquid keeps large pressure, the liquid in the pipe leaks instantly, the next temperature rise pressure cannot be reached, and the heating wire in the pipe is easy to burn out.

Disclosure of Invention

An object of the utility model is to provide a prevent liquid reflux's gear pump to prior art not enough.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a gear pump for preventing liquid backflow comprises a shell and a gear assembly positioned in the shell, wherein the gear assembly comprises an inner gear and an outer gear arranged on the outer side of the inner gear, and the number of the outer teeth of the inner gear is one less than that of the inner teeth of the outer gear; the gear assembly is connected with a rotating shaft which drives the gear assembly to rotate.

Furthermore, the external teeth of the internal gear extend in the direction away from the central axis of the internal gear.

Furthermore, the external teeth are arc teeth.

Further, the internal teeth of the external gear extend in a direction close to the central axis of the external gear.

Furthermore, the internal teeth are arc teeth.

Furthermore, a feeding guide groove is formed in one side of the shell, and a discharge hole is formed in one side, far away from the feeding guide groove, of the shell.

Furthermore, a discharging diversion trench is arranged at a position, close to the discharging hole, on the inner side of the shell, and the discharging diversion trench is communicated with the discharging hole.

Furthermore, a discharge hole for discharging waste materials is formed in one side of the shell.

Furthermore, a waste material guide groove is arranged at a position close to the discharge hole in the shell and communicated with the discharge hole.

Further, the casing includes base and upper cover, one side that the upper cover is close to the base is equipped with the step face, the surrounding sealing washer that is equipped with around the step face.

The utility model has the advantages that:

after the rotating shaft stops rotating, at least one pair of teeth of the inner gear and the outer gear between the feeding diversion trench and the discharging diversion trench are in an occluded state, so that liquid can be effectively prevented from flowing back; the utility model is provided with the discharge hole, which can remove the waste material in the gear pump and ensure the normal operation of the gear pump; and simultaneously, the utility model discloses a be that central pivot rotary drive, the transmission is steady, quiet, noise abatement.

Drawings

FIG. 1 is a schematic view of a gear pump;

FIG. 2 is a schematic cross-sectional view of the gear pump;

FIG. 3 is a schematic structural view of a gear assembly;

FIG. 4 is a schematic top view of the gear assembly structure;

FIG. 5 is a schematic view of the exterior of the base;

FIG. 6 is a schematic view of the interior of the base;

FIG. 7 is a schematic cross-sectional view of a base structure;

FIG. 8 is a schematic perspective view of the upper cover;

fig. 9 is a schematic cross-sectional view of the upper cover structure.

The labels in the figure are: 1-base, 101-feeding diversion trench, 102-waste diversion trench, 103-discharge hole, 104-mounting trench, 2-upper cover, 201-discharging diversion trench, 202-discharge hole, 203-through hole, 204-step surface, 3-rotating shaft, 4-internal gear, 401-external gear, 5-external gear, 501-internal gear, 601-first bushing, 602-second bushing and 7-diversion space.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as fixed or detachable connections or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1 and 2, the embodiment provides a gear pump for preventing backflow of liquid, comprising a housing and a gear assembly located in the housing, wherein the gear assembly comprises an inner gear 4 and an outer gear 5 arranged outside the inner gear 4, the number of outer teeth 401 of the inner gear 4 is one less than that of inner teeth 501 of the outer gear 5; the gear assembly is connected with a rotating shaft 3 which drives the gear assembly to rotate. In the embodiment, a through hole 203 through which the rotating shaft 3 passes is formed in one side of the shell, and one end of the rotating shaft 3 passes through the through hole 203 and is fixedly connected with an inner gear 4 in a gear assembly in the shell; one end of the rotating shaft 3, which is far away from the gear assembly, is used for connecting driving equipment such as a motor and a motor, so that the rotating shaft 3 drives the gear assembly to rotate under the driving of the driving equipment. In an embodiment, the first bushing 601 and the human bushing 602 are respectively disposed at the connection between the rotating shaft 3 and the housing, so as to prevent the rotating shaft 3 from being worn.

Referring to fig. 3 and 4, in the present embodiment, the internal gear 4 is provided with seven external teeth 401; the outer gear 5 is provided with eight inner teeth 501; the outer teeth 401 of the inner gear 4 extend in a direction away from the central axis of the inner gear 4; the internal teeth 501 of the external gear 5 extend in a direction close to the central axis of the external gear 5; the outer teeth 401 and the inner teeth 501 are circular arc teeth. When the device works, the inner gear 4 is driven by the rotating shaft to rotate, the inner gear 4 can drive the outer gear 5 to rotate, and meanwhile, the inner gear 4 rotates relative to the outer gear 5; in the relative rotation process of the internal gear 4 relative to the external gear 5, a flow guide space 7 is formed between the external teeth 401 of the internal gear 4 and the internal teeth 501 of the external gear 5, and the flow guide space 7 performs a periodic action of gradually increasing and then decreasing along with the relative rotation between the internal gear 4 and the external gear 5, so that the process of collecting and then discharging the liquid can be realized.

In other embodiments, the inner gear 4 is provided with eight outer teeth 401; the outer gear 5 is provided with nine inner teeth 501. In other embodiments, the number of the outer teeth of the inner gear 4 and the number of the inner teeth of the outer gear 5 may be set to other numbers according to actual needs, and the number of the outer teeth of the inner gear 4 is only 1 less than the number of the inner teeth of the outer gear 5.

Referring to fig. 2, in an embodiment, the housing includes a base 1 and an upper cover 2, and the upper cover 2 covers the base 1 and forms a cavity for accommodating the gear assembly; through bolt fixed connection between base 1 and the upper cover 2, when its inside gear assembly goes wrong, can conveniently open the maintenance. In the embodiment, an installation groove 104 connected with the rotating shaft 3 is arranged on the inner side of the base 1, and one end of the rotating shaft 3, which is far away from the driving device, is inserted into the installation groove 104, so that the rotating shaft 3 is limited and prevented from eccentric motion in the rotating process; the rotating shaft 3 rotates relative to the side wall of the mounting groove 104.

Referring to fig. 5 to 7, in an embodiment, a feeding guide chute 101 is arranged on the bottom surface of the base 1, and the feeding guide chute 101 is communicated with the inside and the outside of the housing, so that materials can be led out of the inside of the housing from the outside and then enter a flow guiding space 7 between the inner gear 4 and the outer gear 5; in this embodiment, the feeding guide groove 101 is an arc-shaped groove with a wide end and a narrow end. In the embodiment, the bottom of the base 1 is further provided with a waste material diversion trench 102 for discharging waste materials in the shell, the waste material diversion trench 102 is communicated with a discharge hole 103, and the discharge hole 103 is communicated with the outside; when the gear pump is in normal use, the discharge hole 103 is blocked by components such as bolts and the like, so that liquid leakage is avoided, and when the gear pump stops working and waste in the shell needs to be discharged, the corresponding blocking components can be opened to enable the discharge hole 103 to be communicated with the outside to discharge the waste; the waste diversion trench 102 is used for collecting waste in the shell and then discharging the waste from the discharge hole 103.

Referring to fig. 8 and fig. 9, in an embodiment, one end of the upper cover 2 close to the base 1 is provided with a step surface 204 matched with the base 1, and a sealing ring (not shown) is arranged around the step surface 204 instead, i.e. the sealing ring (not shown) is located between the base 1 and the upper cover 2 to play a role of sealing and leakage prevention. In the embodiment, a through hole 203 through which the rotating shaft 3 passes is formed in the position, corresponding to the rotating shaft 3, of the upper cover 2; and one end of the rotating shaft 3, which is far away from the base 1, penetrates through the through hole 203 and is used for connecting driving equipment.

In the embodiment, the upper cover 2 is provided with a discharge guiding groove 201 communicated with the inside of the housing, the discharge guiding groove 201 is communicated with a discharge hole 202, the discharge hole 202 is communicated with the outside, and one end of the discharge hole 202 far away from the discharge guiding groove 201 is used for connecting external equipment, so that the gear pump supplies liquid to the external equipment. In an embodiment, the discharging guide grooves 201 on the upper cover 2 and the feeding guide grooves 101 on the base 1 are staggered in the horizontal direction, that is, in the horizontal direction, the feeding guide grooves 101 and the discharging guide grooves 201 are respectively located on two sides of the rotating shaft 3.

In the using process, the wheel assembly is driven by the rotating shaft 3 to rotate at a constant speed in the shell, and when the diversion space 7 between the inner gear 4 and the outer gear 5 rotates to the position of the feeding diversion trench 101, the wheel assembly is in the maximum state, so that liquid materials are drawn from the feeding diversion trench 101; the gear assembly continuously rotates relative to the shell, the diversion space 7 gradually moves towards the position of the discharge diversion trench 201, meanwhile, along with the relative rotation between the inner gear 4 and the outer gear 5, the diversion space 7 gradually decreases, liquid materials in the diversion space are gradually discharged to the discharge diversion trench 201, and then the materials are discharged through the discharge hole 202; in the embodiment, the diversion space 7 gradually reduces to the minimum in the process of passing through the discharge diversion trench 201, that is, the outer teeth 401 of the inner gear 4 are meshed with the inner teeth 501 of the outer gear 5, so that the liquid in the diversion space 7 is completely discharged. When the gear pump stops working, at least one pair of outer teeth 401 and inner teeth 501 are in an engaged state between the inner gear 4 and the outer gear 5 which are positioned between the feeding guide groove 101 and the processing guide groove 201, so that liquid in the gear pump is prevented from flowing back, a backflow lock is formed, and the function of locking and pressing is achieved.

The above-mentioned embodiments are only one of the preferred embodiments of the present invention, and the ordinary changes and substitutions performed by those skilled in the art within the technical scope of the present invention should be included in the protection scope of the present invention.

Claims

1. The gear pump for preventing liquid backflow comprises a shell and a gear assembly positioned in the shell, and is characterized in that the gear assembly comprises an internal gear (4) and an external gear (5) arranged on the outer side of the internal gear (4), wherein the number of external teeth (401) of the internal gear (4) is one less than that of internal teeth (501) of the external gear (5); the gear assembly is connected with a rotating shaft (3) which drives the gear assembly to rotate; the casing includes base (1) and upper cover (2), one side that upper cover (2) are close to base (1) is equipped with step face (204), step face (204) are around surrounding being equipped with the sealing washer.

2. Gear pump for preventing liquid backflow according to claim 1, characterized in that the outer teeth (401) of the inner gear (4) are provided extending away from the central axis of the inner gear (4).

3. Gear pump for preventing the backflow of liquids, according to claim 1 or 2, characterized in that said external teeth (401) are circular arc teeth.

4. The gear pump for preventing backflow of liquid according to claim 1, wherein the internal teeth (501) of the external gear (5) are provided to extend in a direction close to a central axis of the external gear (5).

5. Gear pump for preventing the backflow of liquids, according to claims 1 or 4, characterized in that said internal teeth (501) are circular arc teeth.

6. Gear pump for preventing liquid backflow according to claim 1, characterized in that the housing is provided with a feed guide chute (101) on one side and the housing is provided with a discharge hole (202) on the side away from the feed guide chute (101).

7. Gear pump for preventing liquid backflow according to claim 6, characterized in that a discharge guide groove (201) is arranged inside the housing at a position close to the discharge hole (202), and the discharge guide groove (201) is communicated with the discharge hole (202).

8. Gear pump for preventing liquid backflow according to claim 1, characterized in that the housing is further provided with a discharge hole (103) for discharging the waste material on one side.

9. Gear pump for preventing liquid backflow according to claim 8, characterized in that a waste material guide chute (102) is provided in the housing close to the discharge hole (103), said waste material guide chute (102) communicating with the discharge hole (103).