External gear pump with overflow valve

Abstract

The utility model provides an external gear pump with an overflow valve, belongs to the field of gear pumps, and solves the problems that the pressure of the gear pump needs to be regulated by an external regulating valve and the gear pump cannot be regulated autonomously. The pump body is provided with an external pipe orifice, the pump cover is provided with a through hole, a movable pipe is arranged in the mounting cover, a first oil passing groove is formed in the lower portion of the movable pipe, a second oil passing groove is formed in the side face of the movable pipe, the movable pipe is provided with an overflow valve, the overflow valve comprises a valve element and an adjusting rod, and the valve element blocks the first oil passing groove and the second oil passing groove. An extension part is arranged at the outlet of the movable pipe and provided with a mounting part, a driving motor is mounted on the mounting part, a square rod is arranged on the adjusting rod, the driving motor is in butt joint with the square rod, a limiting plate is mounted on the adjusting rod and is in threaded connection with the adjusting rod, and a spring is mounted between the limiting plate and the valve element. The gear pump has the advantages that the overflow valve is arranged in the gear pump to adjust the hydraulic pressure of the gear pump, and meanwhile, the adjusting rod is controlled by the driving motor to adjust the threshold value of the overflow valve.

Description

Technical Field

[0001] The utility model belongs to the technical field of gear pumps and relates to a gear pump, in particular to an external meshing gear pump with a relief valve. 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] Gear pumps transport liquids by changing the gap between the meshing gears. However, during this process, the hydraulic pressure inside the liquid will first increase sharply and then decrease. This process may cause friction between the gears and the gear shaft and the pump body, which in turn causes wear of the gears and the gear pump. The meshing gap between the gears increases, which reduces the flow rate and lift of the gear pump. Therefore, existing gear pumps will install a pressure regulating valve on the external pipeline, but this is not conducive to the production of gear pumps; at the same time, the gear pump cannot automatically adjust the pressure. Utility Model Content

[0004] The purpose of the utility model is to address the above-mentioned problems existing in the prior art and to provide an external meshing gear pump with an overflow valve which can perform automatic pressure regulation.

[0005] The utility model can be implemented through the following technical solutions: an external meshing gear pump with an overflow valve, comprising a pump body, a pump cover and a mounting cover, the pump body being provided with an external pipe port, the pump cover being provided with a through hole, a movable tube being provided in the mounting cover, an oil groove 1 being provided below the movable tube, an oil groove 2 being provided on the side of the movable tube, an overflow valve being installed in the movable tube, the overflow valve comprising a valve core and an adjusting rod, the valve core blocking the oil groove 1 and the oil groove 2, an extension being provided at the outlet of the movable tube, a mounting portion being provided on the extension, a drive motor being mounted on the mounting portion, a square rod being provided on the adjusting rod, and the drive motor and the square rod being docked.

[0006] In the above-mentioned external gear pump with a relief valve, grooves are provided at the inlets of the first oil passage groove and the second oil passage groove, and the number of the through holes is the same as the number of the grooves.

[0007] In the above-mentioned external gear pump with a relief valve, a limit portion is provided in the valve core, a limit plate is installed on the regulating rod, and a spring is installed between the limit plate and the limit portion.

[0008] In the above-mentioned external gear pump with an overflow valve, the regulating rod and the limiting plate are connected via threads.

[0009] In the above-mentioned external gear pump with an overflow valve, a sliding groove is provided in the movable tube, and a sliding block is provided on the limiting plate.

[0010] In the above-mentioned external gear pump with a relief valve, a fixing plate is provided on the adjusting rod, and the lower end surface of the fixing plate abuts against the mounting portion.

[0011] In the above-mentioned external gear pump with a relief valve, a contact plate is installed at the end of the spring, a pressure sensor is installed in the limit plate, and the contact plate is in contact with the pressure sensor.

[0012] Compared with the existing technology, the advantages of the present invention are: an overflow valve for adjusting the pressure inside the pump is provided inside the gear pump itself, which facilitates the integrated production of the gear pump; at the same time, the signal transmitted by the sensor through the driving motor affects the square rod to move the limit plate by rotation, thereby adjusting the potential energy inside the spring, and then changing the internal pressure of the overflow valve, so that when the internal pressure of the gear pump changes, the overflow valve can adjust the internal hydraulic pressure of the gear pump in time, thereby improving the service life of the gear pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a perspective view of an external gear pump with a relief valve;

[0014] Figure 2 is a cross-sectional view of an external gear pump with a relief valve;

[0015] Figure 3 This is a front view of the pump cover of an external gear pump with a relief valve;

[0016] Figure 4 This is a front view of the mounting cover of the external gear pump with the relief valve;

[0017] Figure 5 yes Figure 2 Enlarged view of the middle circle A;

[0018] Among them, 1. Pump body; 11. External pipe port; 2. Pump cover; 21. Through hole; 3. Mounting cover; 31. Moving tube; 311. Oil groove 1; 312. Oil groove 2; 313. Groove; 314. Extension; 315. Mounting part; 316. Sliding groove; 4. Overflow valve; 41. Valve core; 411. Limiting part; 42. Adjusting rod; 421. Square rod; 422. Limiting plate; 422a. Slider; 423. Fixed plate; 5. Driving motor; 6. Spring; 61. Contact plate; 62. Pressure sensor; 7. Thread. DETAILED DESCRIPTION

[0019] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0020] like Figure 1 and Figure 5As shown, the utility model can be implemented through the following embodiments: an external meshing gear pump with a relief valve 4, comprising a pump body 1, a pump cover 2 and a mounting cover 3, the pump body 1 is provided with an external pipe port 11, the pump cover 2 is provided with a through hole 21, a movable tube 31 is provided in the mounting cover 3, an oil groove 1 311 is provided below the movable tube 31, an oil groove 2 312 is provided on the side of the movable tube 31, a relief valve 4 is installed in the movable tube 31, the relief valve 4 comprises a valve core 41 and an adjusting rod 42, the valve core 41 blocks the oil groove 1 311 and the oil groove 2 312, an extension portion 314 is provided at the outlet of the movable tube 31, a mounting portion 315 is provided on the extension portion 314, a drive motor 5 is installed on the mounting portion 315, a square rod 421 is provided on the adjusting rod 42, and the drive motor 5 and the square rod 421 are docked.

[0021] The through hole 21 opened on the pump cover 2 is used to open the channel between the pump body 1 and the mounting cover 3, so that the excess liquid in the pump body 1 can enter the relief valve 4, which is convenient for adjusting the hydraulic pressure in the pump body 1; an oil groove 1 311 and an oil groove 2 312 are opened in the movable tube 31, which are convenient for collecting the excess oil at the two gears in the pump body 1, thereby improving the response speed of the relief valve 4; the valve core 41 is used to block the oil groove 1 311 and the oil groove 2 312, so as to prevent the liquid in the pump body 1 from overflowing when the pressure does not exceed the critical value, thereby extending the service life of the relief valve 4; the driving motor 5 controls the adjusting rod 42 by rotating the square rod 421, and the adjusting rod 42 rotates to adjust the pressure value inside the relief valve 4.

[0022] like Figures 2 to 4 As shown, grooves 313 are provided at the entrances of the first oil groove 311 and the second oil groove 312. The number of through-holes 21 matches the number of grooves 313. The provision of grooves 313 facilitates the entry of oil into the first oil groove 311 and the second oil groove 312, improving response speed. Furthermore, the provision of grooves 313 creates a transition between the through-hole 21 and the first oil groove 311 and the second oil groove 312, preventing oil from accidentally flowing into the first oil groove 311 and the second oil groove 312.

[0023] like Figure 2 and Figure 5 As shown, a limit portion 411 is defined within the valve core 41, and a limit plate 422 is mounted on the regulating rod 42. A spring 6 is installed between the limit plate 422 and the limit portion 411. Since the valve core 41 is stationary, the regulating rod 42 causes the limit plate 422 to move when it rotates. The distance between the limit plate 422 and the limit portion 411 determines the thrust of the spring 6 and, therefore, the overflow threshold of the relief valve 4.

[0024] like Figure 2 and Figure 5As shown, the adjusting rod 42 and the limiting plate 422 are connected by a thread 7. The thread 7 allows the limiting plate 422 to move steadily when the adjusting rod 42 rotates, preventing the spring 6 from deviating from the contact with the limiting plate 422 due to the rapid movement of the limiting plate 422, thereby affecting the actual overflow threshold of the overflow valve 4.

[0025] like Figure 2 and Figure 5 As shown, a sliding groove 316 is provided in the movable tube 31, and a slider 422a is provided on the limiting plate 422. The slider 422a cooperates with the sliding groove 316 to guide the limiting plate 422 to move and prevent the limiting plate 422 from rotating or deflecting when moving.

[0026] like Figure 2 As shown, a fixing plate 423 is provided on the adjusting rod 42, and the lower end surface of the fixing plate 423 abuts the mounting portion 315. The fixing plate 423 is used to prevent the adjusting rod 42 from moving with the rotation of the thread 7 when rotating, causing the connection between the adjusting rod 42 and the drive motor 5 to be disconnected.

[0027] like Figure 2 and Figure 5 As shown, a contact plate 61 is mounted on the end of the spring 6, and a pressure sensor 62 is mounted inside the limit plate 422. The contact plate 61 contacts the pressure sensor 62. The contact plate 61 and the pressure sensor 62 constantly reflect the pressure of the spring 6, and activate the drive motor 5 when the pressure is too high or too low, thereby preventing the relief valve 4 from failing to activate or activating too frequently.

[0028] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0029] Although various terms are used in this document, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. An external gear pump with a relief valve, comprising a pump body (1), a pump cover (2) and a mounting cover (3), wherein the pump body (1) is provided with an external pipe port (11), characterized in that: The pump cover (2) is provided with a through hole (21), a movable tube (31) is provided in the mounting cover (3), an oil groove (311) is provided below the movable tube (31), an oil groove (312) is provided on the side of the movable tube (31), an overflow valve (4) is installed in the movable tube (31), the overflow valve (4) comprises a valve core (41) and an adjusting rod (42), the valve core (41) blocks the oil groove (311) and the oil groove (312), an extension portion (314) is provided at the outlet of the movable tube (31), a mounting portion (315) is provided on the extension portion (314), a driving motor (5) is installed on the mounting portion (315), a square rod (421) is provided on the adjusting rod (42), and the driving motor (5) and the square rod (421) are connected.

2. The external gear pump with a relief valve according to claim 1, characterized in that: Grooves (313) are provided at the entrances of the first oil passage groove (311) and the second oil passage groove (312), and the number of the through holes (21) is the same as the number of the grooves (313).

3. The external gear pump with a relief valve according to claim 1, characterized in that: A limiting portion (411) is provided in the valve core (41), a limiting plate (422) is installed on the regulating rod (42), and a spring (6) is installed between the limiting plate (422) and the limiting portion (411).

4. The external gear pump with a relief valve according to claim 3, characterized in that: The adjusting rod (42) and the limiting plate (422) are connected via a thread (7).

5. The external gear pump with a relief valve according to claim 3, characterized in that: A sliding groove (316) is provided in the movable tube (31), and a sliding block (422a) is provided on the limiting plate (422).

6. The external gear pump with a relief valve according to claim 1, characterized in that: A fixing plate (423) is provided on the adjusting rod (42), and the lower end surface of the fixing plate (423) abuts against the mounting portion (315).

7. The external gear pump with a relief valve according to claim 3, characterized in that: A contact plate (61) is installed at the end of the spring (6), a pressure sensor (62) is installed in the limit plate (422), and the contact plate (61) is in contact with the pressure sensor (62).

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