CN115875334A

CN115875334A - Anti-blocking throttling device for hydraulic variable motor

Info

Publication number: CN115875334A
Application number: CN202211554062.8A
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: 2023-03-31

Abstract

The invention 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 moving axially is arranged in the cavity (1), through grooves (3) are respectively formed at two ends of the throttling valve core (2), through holes (4) penetrating through the shell are respectively 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 throttle valve core (2) and the cavity (1) 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 V-shaped through grooves (3) are formed in the conical surfaces (5); an axial cutting plane (10) is arranged on the peripheral surface of the throttle valve core (2), and the inner side end of the through groove (3) is connected with the cutting plane (10). The invention has the advantages of difficult blockage and low cost.

Description

Anti-blocking throttling device for hydraulic variable motor

Technical Field

The invention 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 piston pumps), orifices are often used to regulate flow and control variable displacement speed of the variable displacement motor. Because there are often invasive pollutants in the hydraulic system, when pollutants with a size close to the cross-sectional area of the orifice enter the variable control loop, the orifice is easily partially or completely blocked by the pollutants, so that the variable motor has a fault that the variable speed is slow or even the variable speed cannot be changed. Therefore, the conventional orifice has a drawback of being easily clogged.

Disclosure of Invention

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

The technical scheme of the invention is as follows: a prevent blockking up throttling arrangement for on hydraulic pressure variable motor, including the shell, be equipped with the cavity in the shell, be equipped with the throttle valve core that can axial displacement in the cavity, throttle valve core both ends all are equipped with logical groove, and the both sides of throttle valve core all are equipped with the through-hole that runs through the shell, and the through-hole links up the cavity through leading to the groove.

In the anti-clogging throttling device for the hydraulic variable motor, the cavity and the throttling valve core are cylindrical, a step is formed between the cavity and the through hole, conical surfaces are arranged at two ends of the throttling valve core, and a V-shaped through groove is formed in each conical surface.

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

In the anti-clogging throttling device for the hydraulic variable motor, a chamfer is arranged on the step.

In the anti-clogging throttling device for the hydraulic variable motor, the housing is composed of a throttling valve seat and a plug screw, one part of the cavity is located on the throttling valve seat, and the other part of the cavity is located on the plug screw.

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

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

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is an exploded view of the present invention.

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

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

Detailed Description

The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.

Examples are given. A prevent blockking up throttling arrangement for on hydraulic pressure variable displacement motor, as shown in fig. 1 and fig. 2, including the shell, be equipped with cavity 1 in the shell, be equipped with throttle valve core 2 that can axial displacement in the cavity 1, cavity 1 with throttle valve core 2 is cylindrical, and the both ends of throttle valve core 2 all are equipped with conical surface 5 (tapering 1.866), are equipped with the logical groove 3 of V-arrangement on the conical surface 5, and the both sides of throttle valve core 2 all are equipped with the through-hole 4 that runs through the shell, and through-hole 4 links up cavity 1 through leading to groove 3, 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 peripheral surface of the throttle valve core 2, the two cutting planes 10 are respectively positioned at 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 cutting plane 10. The cutting plane 10 allows a larger flow path to be formed between the throttle body 2 and the housing, so that contaminants are not easily caught between the throttle body 2 and the housing.

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

The shell is composed 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 the radial section of the cavity 1. The shell consists of two parts, so that the shell is convenient to process.

And the throttle valve seat 7 and the plug screw 8 are both provided with external threads 9.

In the embodiment, 1), the throttle valve seat 7 and the plug screw 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 then the plug screw 8 is screwed in, so that the throttle valve seat 7 and the plug screw are tightly attached).

2) The V-shaped through grooves 3 are formed in the conical surfaces at the two ends of the throttling valve core 2, the conical surfaces 5 form sealing rings when being contacted with the throttling valve seat 7 and the chamfer 6 at the orifice of the screw plug 8, oil can only flow through the V-shaped through grooves 3 and is used for throttling speed regulation, and at the moment, the through grooves 3 substantially play a role of throttling holes.

3) And as the throttle valve core 2 can move left and right in the cavity 1 formed by the throttle valve seat 7 and the screw plug 8, the throttle valve core 2 can only contact with one chamfer 6 to form a sealing ring.

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

If the pollutants in the oil are stuck 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 a 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 differential pressure, and pollutants can be released from the V-shaped groove at the right side and are gradually discharged along with oil.

Claims

1. A prevent blockking up throttling arrangement for on hydraulic pressure variable displacement motor, its characterized in that: the throttling valve comprises an outer shell, wherein a cavity (1) is arranged in the outer shell, a throttling valve core (2) capable of moving axially 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 outer 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).

2. The choke-resistant restriction device for a hydraulic variable displacement motor according to claim 1, wherein: the throttle valve is characterized in that 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 a V-shaped through groove (3) is formed in each conical surface (5).

3. The choke-resistant restriction device for a hydraulic variable displacement motor according to claim 1, wherein: an axial cutting plane (10) is arranged on the peripheral 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 choke-resistant throttle device for a hydraulic variable displacement motor according to claim 2, characterized in that: the length of the throttle valve core (2) is greater than that of the cavity (1).

5. The choke-resistant throttle device for a hydraulic variable displacement motor according to claim 2, characterized in that: and a chamfer (6) is arranged on the step.

6. The choke-resistant restriction device for a hydraulic variable displacement motor according to claim 1, wherein: the shell is composed 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 choke-resistant restriction device for a hydraulic variable displacement motor according to claim 6, wherein: and the throttling valve seat (7) and the plug screw (8) are both provided with external threads (9).