CN219139509U

CN219139509U - Anti-blocking throttling device for hydraulic variable motor

Info

Publication number: CN219139509U
Application number: CN202223254553.9U
Authority: CN
Inventors: 杨振莉; 陈新雁; 李桂平; 解文龙; 鲁江黔; 林军军
Original assignee: Liande Hydraulic Guiyang Co ltd
Current assignee: Liande Hydraulic Guiyang Co ltd
Priority date: 2022-12-06
Filing date: 2022-12-06
Publication date: 2023-06-06
Anticipated expiration: 2032-12-06

Abstract

The utility model discloses an anti-blocking throttling device for a hydraulic variable motor, which comprises a shell, wherein a cavity (1) is arranged in the shell, a throttling valve core (2) capable of axially moving is arranged in the cavity (1), through grooves (3) are formed in two ends of the throttling valve core (2), through holes (4) penetrating through the shell are formed in two sides of the throttling valve core (2), and the through holes (4) are communicated with the cavity (1) through the through grooves (3); the cavity (1) and the throttle valve core (2) are cylindrical, a step is formed between the cavity (1) and the through hole (4), conical surfaces (5) are arranged at two ends of the throttle valve core (2), and the conical degree 1 of the conical surfaces (5) is as follows: (0.7-0.95), and the conical surface (5) is provided with a V-shaped through groove (3). The utility model has the advantages of difficult blockage and lower cost.

Description

Anti-blocking throttling device for hydraulic variable motor

Technical Field

The utility model belongs to the field of hydraulic variable motors, and particularly relates to an anti-blocking throttling device for a hydraulic variable motor.

Background

Orifices are widely used on hydraulic components, and in variable control circuits for hydraulic variable displacement motors (e.g., variable displacement pumps), orifices are often used to regulate flow and control the variable displacement speed of the variable displacement motor. Because of the often invasive pollutants in the hydraulic system, when the pollutants with the size close to the sectional area of the throttle orifice enter the variable control loop, the throttle orifice is very easy to be blocked by the pollutants or to be blocked completely, so that the variable motor has the fault that the variable speed is slow or even the variable motor cannot be changed. Therefore, the existing orifice has a defect of being easily blocked.

Disclosure of Invention

The utility model aims to provide an anti-blocking throttling device for a hydraulic variable motor. The utility model has the advantages of difficult blockage and lower cost.

The technical scheme of the utility model is as follows: the anti-blocking throttling device for the hydraulic variable motor comprises a shell, wherein a cavity is arranged in the shell, a throttling valve core capable of axially moving is arranged in the cavity, through grooves are formed in two ends of the throttling valve core, through holes penetrating through the shell are formed in two sides of the throttling valve core, and the through holes are communicated with the cavity through the through grooves; the cavity with the throttle valve core is cylindrical, constitutes the step between cavity and the through-hole, and the both ends of throttle valve core all are equipped with the conical surface, the tapering of conical surface 1: (0.7-0.95), the conical surface is provided with a V-shaped through groove.

In the anti-blocking throttling device for the hydraulic variable motor, the taper of the conical surface is 1:0.866.

in the anti-blocking throttling device for the hydraulic variable motor, an axial cutting plane is arranged on the outer peripheral surface of the throttling valve core, and the inner side end of the through groove is connected with the cutting plane.

In the anti-blocking throttling device for the hydraulic variable motor, the length of the throttling valve core is larger than that of the cavity.

In the anti-blocking throttling device for the hydraulic variable motor, the step is provided with a chamfer.

In the anti-blocking throttling device for the hydraulic variable motor, the shell consists of a throttling valve seat and a screw plug, one part of the cavity is positioned on the throttling valve seat, and the other part of the cavity is positioned on the screw plug.

In the anti-blocking throttling device for the hydraulic variable motor, the throttling valve seat and the screw plug are both provided with external threads.

Compared with the prior art, the throttling valve core capable of axially moving is arranged in the shell, and the through grooves are formed in the two ends of the throttling valve core, so that the throttling effect of the throttling hole is realized through the through grooves, the throttling valve core is axially moved by utilizing the pressure difference change generated in the working process of the hydraulic variable motor, and pollutants clamped between the throttling valve core and the shell can be smoothly discharged, and the formation of blockage is avoided. In addition, the utility model has simple structure and lower cost. Therefore, the utility model has the advantages of difficult blockage and lower cost.

Drawings

Fig. 1 is a front view of the present utility model.

Fig. 2 is an exploded view of the present utility model.

Fig. 3 is a hydraulic schematic of a hydraulic variable displacement motor.

The marks in the drawings are: 1-cavity, 2-throttle valve core, 3-through groove, 4-through hole, 5-conical surface, 6-chamfer, 7-throttle valve seat, 8-plug screw, 9-external screw thread, 10-cutting plane.

Detailed Description

The utility model is further illustrated by the following figures and examples, which are not intended to be limiting.

Examples. A prevent blockking up throttling arrangement for on hydraulic variable motor, as shown in fig. 1 and 2, including the shell, be equipped with cavity 1 in the shell, be equipped with throttle case 2 that can axial displacement in the cavity 1, cavity 1 with throttle case 2 is cylindrical, and the both ends of throttle case 2 all are equipped with conical surface 5, tapering 1:0.866, be equipped with V-arrangement's logical groove 3 on the conical surface 5, the both sides of throttle case 2 all are equipped with the through-hole 4 that runs through the shell, and cavity 1 is linked through logical groove 3 to through-hole 4, constitutes the step between cavity 1 and the through-hole 4, is equipped with chamfer 6 on the step.

Two cutting planes 10 are arranged on the outer peripheral surface of the throttle valve core 2, the two cutting planes 10 are respectively positioned on two sides of the throttle valve core 2 and are symmetrically distributed, and the inner side end of the through groove 3 is connected with one of the cutting planes 10. The cutting plane 10 can form a larger flow passage between the throttle valve core 2 and the shell, so that pollutants are not easy to be blocked between the throttle valve core 2 and the shell.

The length of the throttle valve core 2 is longer than that of the cavity 1.

The shell consists of a throttle valve seat 7 and a screw plug 8, one part of the cavity 1 is positioned on the throttle valve seat 7, the other part of the cavity 1 is positioned on the screw plug 8, and the contact surface of the throttle valve seat 7 and the screw plug 8 is a radial section of the cavity 1. The shell consists of two parts, so that the shell is convenient to process.

External threads 9 are arranged on the throttle valve seat 7 and the screw plug 8.

In the embodiment, 1), the throttle valve seat 7 and the screw plug 8 are of external thread structures, and are conveniently fixed in an oil way with a threaded hole (the throttle valve seat 7 is screwed in, and the screw plug 8 is screwed in again, so that the throttle valve seat 7 and the screw plug are tightly attached).

2) V-shaped through grooves 3 are formed in conical surfaces at two ends of the throttle valve core 2, when the conical surfaces 5 are in contact with the throttle valve seat 7 and the chamfer 6 of the orifice of the screw plug 8, a sealing ring is formed, oil can only flow through the V-shaped through grooves 3 for throttle speed adjustment, and at the moment, the through grooves 3 essentially play a role of throttle holes.

3) Since the throttle body 2 can move left and right in the cavity 1 formed by the throttle valve seat 7 and the screw plug 8, the throttle body 2 can only contact one of the chamfers 6 to form a sealing ring.

Working principle: as shown in fig. 3, E is an anti-blocking throttling device, a motor port a is an inlet, a motor port B is an outlet, an electromagnet is electrified to enable a control valve F to work at a left position, the pressure of the motor port a acts on the left side of the throttling device E, the pressure of a rodless cavity of a variable piston N is smaller than that of the motor port a, under the action of pressure difference, a right conical surface 5 of a throttling valve core 2 is tightly attached to a chamfer 6 of a screw plug 8, and oil enters the rodless cavity of the variable piston N through a right through groove 3, so that the motor is variable.

If the pollutants in the oil liquid are blocked on the right V-shaped groove at the moment, the motor cannot normally change; when the electromagnet is powered off, the control valve F works at the right position, the left side of the anti-blocking throttling device E is communicated with the oil return cavity T, the pressure of the rodless cavity of the variable piston N is larger than that of the oil return cavity T, the throttling valve core 2 moves leftwards under the action of pressure difference, and pollutants can be released from the V-shaped groove at the right side and gradually discharged along with oil.

Claims

1. An anti-blocking throttling device for a hydraulic variable motor is characterized in that: the device comprises a shell, wherein a cavity (1) is arranged in the shell, a throttle valve core (2) capable of axially moving is arranged in the cavity (1), through grooves (3) are formed in two ends of the throttle valve core (2), through holes (4) penetrating through the shell are formed in two sides of the throttle valve core (2), and the through holes (4) are communicated with the cavity (1) through the through grooves (3); the cavity (1) and the throttle valve core (2) are cylindrical, a step is formed between the cavity (1) and the through hole (4), conical surfaces (5) are arranged at two ends of the throttle valve core (2), and the conical degree 1 of the conical surfaces (5) is as follows: (0.7-0.95), and the conical surface (5) is provided with a V-shaped through groove (3).

2. The anti-clogging restriction device for a hydraulic variable displacement motor of claim 1, wherein: taper 1 of the conical surface (5): 0.866.

3. the anti-clogging restriction device for a hydraulic variable displacement motor of claim 1, wherein: an axial cutting plane (10) is arranged on the outer circumferential surface of the throttle valve core (2), and the inner side end of the through groove (3) is connected with the cutting plane (10).

4. The anti-clogging restriction device for a hydraulic variable displacement motor of claim 2, wherein: the length of the throttle valve core (2) is longer than that of the cavity (1).

5. The anti-clogging restriction device for a hydraulic variable displacement motor of claim 2, wherein: the step is provided with a chamfer (6).

6. The anti-clogging restriction device for a hydraulic variable displacement motor of claim 1, wherein: the shell consists of a throttle valve seat (7) and a screw plug (8), one part of the cavity (1) is positioned on the throttle valve seat (7), and the other part of the cavity (1) is positioned on the screw plug (8).

7. The anti-clogging throttling device for a hydraulic variable motor of claim 6, wherein: external threads (9) are arranged on the throttle valve seat (7) and the screw plug (8).