Gear pump with cat-eye-shaped unloading groove structure

Abstract

The utility model discloses a gear pump with a cat-eye-shaped unloading groove structure, relates to the technical field of gear pumps, and aims to solve the problems that in the prior art, most existing gear pumps adopt rectangular unloading grooves to relieve the oil trapping phenomenon, and liquid entering the rectangular unloading grooves is prone to falling off due to the fact that right angles are formed between the side walls of the unloading grooves and the inner wall of a pump cover. The problems that liquid cannot flow out of the unloading groove conveniently, the overflow pressure in the unloading groove is large, and overflow is difficult are solved. Cat-eye-shaped unloading grooves are formed in the two sides of the middle of the inner end face of the gear pump side cover correspondingly, gear grooves are formed in the upper end and the lower end of the middle of the gear pump cylinder correspondingly, a driving gear and a driven gear are rotationally connected into the two gear grooves correspondingly, and interval grooves are formed between every two adjacent tooth parts on the driving gear and the driven gear correspondingly; threaded grooves are formed in the positions, on the side end faces of the driving gear and the driven gear, in the interval grooves correspondingly, and the lower ends of the threaded grooves are connected with liquid receiving grooves.

Description

Technical Field

[0001] The utility model relates to the field of gear pumps, in particular to a gear pump with a cat's eye shaped unloading groove structure. Background Art

[0002] The 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. It consists of two closed spaces, two gears, a pump body, and front and rear covers. When the gears rotate, the volume of the space on the gear disengagement side changes from small to large, forming a vacuum, sucking the liquid in, and the volume of the space on the gear meshing side changes from large to small, squeezing the liquid into the pipeline. The suction chamber and the discharge chamber are separated by the meshing line of the two gears. The pressure of the gear pump's discharge port depends entirely on the size of the resistance at the pump outlet. The unloading groove is used to eliminate the oil trapped in the gear pump and ensure the smooth operation of the gear pump.

[0003] Most of the existing gear pumps use a rectangular unloading groove to alleviate the oil trapping phenomenon. However, the liquid entering the rectangular unloading groove is not easy to flow out of the unloading groove because the side wall of the unloading groove and the inner wall of the pump cover are at a right angle, resulting in a large overflow pressure in the unloading groove and difficulty in overflow. Therefore, the market urgently needs to develop a gear pump with a cat's eye shaped unloading groove structure to help people solve the existing problem. Utility Model Content

[0004] The purpose of the utility model is to provide a gear pump with a cat's eye shaped unloading groove structure to solve the problem that most of the existing gear pumps proposed in the above background technology adopt a rectangular unloading groove to alleviate the oil trapped phenomenon, and the liquid entering the rectangular unloading groove is not convenient for the liquid to flow out of the unloading groove because the side wall of the unloading groove and the inner wall of the pump cover are at a right angle, resulting in a large overflow pressure in the unloading groove and difficulty in overflowing.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a gear pump with a cat's eye-shaped unloading groove structure, comprising a gear pump side cover and a gear pump cylinder body, cat's eye-shaped unloading grooves are arranged on both sides of the middle part of the inner end surface of the gear pump side cover, the cat's eye-shaped unloading grooves are composed of a semicircular groove and two arc grooves, a pump inlet is arranged on one side of the middle part of the gear pump cylinder body, a pump outlet is arranged on the other side of the middle part of the gear pump cylinder body, gear grooves are arranged on both upper and lower ends of the middle part of the gear pump cylinder body, a driving gear and a driven gear are respectively rotatably connected inside the two gear grooves, a spacing groove is arranged between two adjacent tooth portions on the driving gear and the driven gear, a thread groove is arranged on the side end surfaces of the driving gear and the driven gear in the spacing groove, a liquid receiving groove is connected to the lower end of the thread groove, a sealing cover is connected to the thread groove, and a telescopic cap is arranged inside the liquid receiving groove.

[0006] Preferably, the two arc-shaped grooves are respectively connected to two sides of the semicircular groove, and the connection between the two arc-shaped grooves and the inner end surface of the gear pump side cover is provided with a first arc-shaped edge.

[0007] Preferably, a second arc-shaped edge is provided at the connection between the two arc-shaped grooves and the semicircular groove and the inner end surface of the gear pump side cover.

[0008] Preferably, a liquid receiving port is provided in the middle of the top of the cover, a threaded portion is fixedly connected to the side end surface of the cover, and a circular limiting groove is provided inside the cover.

[0009] Preferably, the sealing cover is inserted into the thread groove and is threadably connected and fixed to the thread groove via the threaded portion.

[0010] Preferably, the upper end of the telescopic cap slides into a circular limiting groove provided inside the sealing cover for limiting connection.

[0011] Preferably, a return spring is connected between the inner upper end surface of the telescopic cap and the inner lower end surface of the liquid receiving tank.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. In the utility model, through the setting of the cat's eye type unloading groove, cat's eye type unloading grooves are arranged on both sides of the middle part of the inner end surface of the gear pump side cover. The cat's eye type unloading groove is composed of a semicircular groove and two arc grooves, and the two arc grooves are respectively connected to the two sides of the semicircular groove. The connection between the two arc grooves and the inner end surface of the gear pump side cover is provided with a first arc edge. The cat's eye type unloading groove composed of two arc grooves and one semicircular groove is used to guide the trapped oil, so that the trapped oil can flow out of the cat's eye type unloading groove.

[0014] 2. In the utility model, through the setting of the liquid receiving groove, the interval groove is respectively provided with a threaded groove on the side end surface of the driving gear and the driven gear, the lower end of the threaded groove is connected to the liquid receiving groove, the threaded groove is connected to a sealing cover, and a telescopic cap is provided inside the liquid receiving groove. When the pressure in the unloading cavity between the driving gear and the driven gear is relatively large, the liquid pressure will push the telescopic cap to compress the return spring to contract, so that the liquid enters the liquid receiving groove from the liquid receiving port to relieve the pressure in the unloading cavity. When the unloading cavity disappears, the return spring pushes the telescopic cap to reset, so that the liquid in the liquid receiving groove is discharged from the liquid receiving port and flows back to the inside of the gear pump cylinder, thereby alleviating the oil trapped phenomenon.

[0015] 3. In the utility model, by setting the first arcuate edge and the second arcuate edge, the connection between the two arcuate grooves and the inner end surface of the gear pump side cover is provided with a first arcuate edge, and the connection between the two arcuate grooves and the semicircular groove and the inner end surface of the gear pump side cover is provided with a second arcuate edge. By setting the first arcuate edge and the second arcuate edge, when the side surfaces of the driving gear and the driven gear pass through the cat's eye type unloading groove, there will be no arcuate shearing between the edge of the rectangular unloading groove and the tooth portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of a gear pump with a cat's eye shaped unloading groove structure according to the utility model;

[0017] Figure 2 This is the front view of the inner side of the gear pump side cover of the utility model;

[0018] Figure 3 This is the front view of the gear pump cylinder of the utility model;

[0019] Figure 4 It is a side sectional view of the cat-eye type unloading groove of the utility model;

[0020] Figure 5 It is an enlarged view of the detail A of the utility model;

[0021] Figure 6 It is an enlarged view of detail B of the present utility model.

[0022] In the figure: 1. gear pump side cover; 101. cat's eye type unloading groove; 102. semicircular groove; 103. arc groove; 104. first arc edge; 105. second arc edge; 2. gear pump cylinder; 201. pump inlet; 202. pump outlet; 203. gear groove; 3. driving gear; 301. driven gear; 302. spacing groove; 303. thread groove; 304. liquid receiving groove; 4. sealing cover; 401. threaded part; 402. liquid receiving port; 403. circular limit groove; 5. telescopic cap; 501. reset spring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] See also Figure 1-6The utility model provides an embodiment: a gear pump with a cat's eye-shaped unloading groove structure, including a gear pump side cover 1 and a gear pump cylinder 2, the gear pump side cover 1 is provided with cat's eye-shaped unloading grooves 101 on both sides of the middle of the inner end surface, the cat's eye-shaped unloading groove 101 is composed of a semicircular groove 102 and two arc grooves 103, a pump inlet 201 is provided on one side of the middle of the gear pump cylinder 2, a pump outlet 202 is provided on the other side of the middle of the gear pump cylinder 2, and the upper and lower ends of the middle of the gear pump cylinder 2 are Gear grooves 203 are provided, and a driving gear 3 and a driven gear 301 are rotatably connected inside the two gear grooves 203 respectively. A spacing groove 302 is provided between two adjacent tooth portions on the driving gear 3 and the driven gear 301. A thread groove 303 is provided on the side end faces of the driving gear 3 and the driven gear 301 in the spacing groove 302 respectively. A liquid receiving groove 304 is connected to the lower end of the thread groove 303, a sealing cover 4 is connected inside the thread groove 303, and a telescopic cap 5 is provided inside the liquid receiving groove 304.

[0025] Furthermore, two arc grooves 103 are respectively connected to both sides of the semicircular groove 102, and a first arc edge 104 is provided at the connection between the two arc grooves 103 and the inner end surface of the gear pump side cover 1. The trapped oil is diverted through the cat's eye type unloading groove 101 composed of two arc grooves 103 and a semicircular groove 102, so that the trapped oil can flow out of the cat's eye type unloading groove 101.

[0026] Furthermore, a second arcuate edge 105 is provided at the connection between the two arcuate grooves 103 and the semicircular groove 102 and the inner end surface of the gear pump side cover 1. Through the setting of the first arcuate edge 104 and the second arcuate edge 105, when the driving gear 3 and the driven gear 301 pass through the cat's eye type unloading groove 101 from the side, there will be no arcuate shearing between the edge of the rectangular unloading groove and the tooth portion.

[0027] Furthermore, a liquid receiving port 402 is provided in the middle of the top of the sealing cover 4 , a threaded portion 401 is fixedly connected to the side end surface of the sealing cover 4 , and a circular limiting groove 403 is provided inside the sealing cover 4 .

[0028] Furthermore, the cover 4 is inserted into the thread groove 303 and is threadedly connected and fixed to the thread groove 303 via the threaded portion 401 .

[0029] Furthermore, the upper end of the telescopic cap 5 slides into the circular limiting groove 403 provided inside the sealing cover 4 for limiting connection, and the telescopic cap 5 is movably limited by the sealing cover 4 to prevent the telescopic cap 5 from falling out of the liquid receiving tank 304 .

[0030] Furthermore, a return spring 501 is connected between the upper end surface inside the telescopic cap 5 and the lower end surface inside the liquid receiving tank 304. When the pressure in the unloading chamber between the driving gear 3 and the driven gear 301 is relatively large, the liquid pressure will push the telescopic cap 5 to compress the return spring 501 and contract it, so that the liquid enters the liquid receiving tank 304 from the liquid receiving port 402 to relieve the pressure in the unloading chamber. When the unloading chamber disappears, the return spring 501 pushes the telescopic cap 5 to reset, so that the liquid in the liquid receiving tank 304 is discharged from the liquid receiving port 402 and flows back to the gear pump cylinder 2, thereby alleviating the oil trapped phenomenon.

[0031] Working principle: When in use, cat's eye type unloading grooves 101 are arranged on both sides of the middle of the inner end surface of the gear pump side cover 1. The cat's eye type unloading groove 101 is composed of a semicircular groove 102 and two arc grooves 103. The two arc grooves 103 are respectively connected to the two sides of the semicircular groove 102. The connection between the two arc grooves 103 and the inner end surface of the gear pump side cover 1 is provided with a first arc edge 104. The cat's eye type unloading groove 101 composed of two arc grooves 103 and a semicircular groove 102 is used to guide the trapped oil to facilitate the trapped oil to flow out of the cat's eye type unloading groove 101. The connection between the two arc grooves 103 and the semicircular groove 102 and the inner end surface of the gear pump side cover 1 is provided with a second arc edge 105. Through the first arc edge 104 The arrangement of the second arc edge 105 ensures that when the driving gear 3 and the driven gear 301 pass through the cat's eye type unloading groove 101 from the side, there will be no arc shearing between the edge of the rectangular unloading groove and the tooth portion. A reset spring 501 is connected between the upper end surface inside the telescopic cap 5 and the lower end surface inside the liquid receiving groove 304. When the pressure in the unloading cavity between the driving gear 3 and the driven gear 301 is relatively large, the liquid pressure will push the telescopic cap 5 to compress the reset spring 501 and contract it, so that the liquid enters the liquid receiving groove 304 from the liquid receiving port 402 to relieve the pressure in the unloading cavity. When the unloading cavity disappears, the reset spring 501 pushes the telescopic cap 5 to reset, so that the liquid in the liquid receiving groove 304 is discharged from the liquid receiving port 402 and flows back to the gear pump cylinder 2, thereby alleviating the oil trapped phenomenon.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A gear pump with a cat's eye shaped unloading groove structure, comprising a gear pump side cover (1) and a gear pump cylinder body (2), characterized in that: Cat's eye type unloading grooves (101) are arranged on both sides of the middle of the inner end surface of the gear pump side cover (1), and the cat's eye type unloading groove (101) is composed of a semicircular groove (102) and two arc grooves (103). A pump inlet (201) is arranged on one side of the middle of the gear pump cylinder body (2), and a pump outlet (202) is arranged on the other side of the middle of the gear pump cylinder body (2). Gear grooves (203) are arranged at both upper and lower ends of the middle of the gear pump cylinder body (2), and the insides of the two gear grooves (203) are respectively rotatably connected to each other. A driving gear (3) and a driven gear (301) are provided, wherein a spacing groove (302) is provided between two adjacent tooth portions on the driving gear (3) and the driven gear (301), wherein a thread groove (303) is provided in the spacing groove (302) on the side end surfaces of the driving gear (3) and the driven gear (301), respectively, wherein the lower end of the thread groove (303) is connected to a liquid receiving groove (304), wherein a sealing cover (4) is connected in the thread groove (303), and a telescopic cap (5) is provided inside the liquid receiving groove (304).

2. The gear pump with a cat's eye shaped unloading groove structure according to claim 1, characterized in that: The two arc-shaped grooves (103) are respectively connected to the two sides of the semicircular groove (102), and the connection between the two arc-shaped grooves (103) and the inner end surface of the gear pump side cover (1) is provided with a first arc-shaped edge (104).

3. The gear pump with a cat's eye shaped unloading groove structure according to claim 1, characterized in that: A second arc-shaped edge (105) is provided at the joint between the two arc-shaped grooves (103) and the semicircular groove (102) and the inner end surface of the gear pump side cover (1).

4. The gear pump with a cat's eye shaped unloading groove structure according to claim 1, characterized in that: A liquid receiving port (402) is provided in the middle of the top of the sealing cover (4), a threaded portion (401) is fixedly connected to the side end surface of the sealing cover (4), and a circular limiting groove (403) is provided inside the sealing cover (4).

5. The gear pump with a cat's eye shaped unloading groove structure according to claim 4, characterized in that: The sealing cover (4) is inserted into the thread groove (303) and is threadably connected and fixed to the thread groove (303) via the threaded portion (401).

6. The gear pump with a cat's eye shaped unloading groove structure according to claim 4, characterized in that: The upper end of the telescopic cap (5) slides into a circular limiting groove (403) provided inside the sealing cover (4) for limiting connection.

7. The gear pump with a cat's eye shaped unloading groove structure according to claim 1, characterized in that: A return spring (501) is connected between the internal upper end surface of the telescopic cap (5) and the internal lower end surface of the liquid receiving tank (304).

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