US-12618423-B2 - Oil drain valve, energy accumulation device, hydraulic system and working machine

US12618423B2US 12618423 B2US12618423 B2US 12618423B2US-12618423-B2

Abstract

Disclosed are an oil drain valve, an energy accumulation device, a hydraulic system and a working machine. The oil drain valve includes a valve body, a valve core and an elastic element. The valve body is provided with a first oil port and a second oil port, the valve core is communicated with the first oil port and the second oil port, and the valve core is movable in the valve body to switch from a first working position to a second working position. The elastic element is provided between a first end of the valve core and the valve body, the first end of the valve core is communicated with the first oil port, and a second end of the valve core is communicated with the second oil port.

Inventors

Bin Luo
Guangyu SU
Fengwei Wang

Assignees

SANY AUTOMOBILE MANUFACTURING CO. LTD

Dates

Publication Date: 20260505
Application Date: 20240305
Priority Date: 20210929

Claims (9)

1 . An oil drain valve, comprising a valve body, a valve core and an elastic element; wherein the valve body is provided with a first oil port and a second oil port, and the valve core is provided between the first oil port and the second oil port; the valve core is communicated with the first oil port and the second oil port, and the valve core is movable in the valve body to switch from a first working position to a second working position; the elastic element is provided between a first end of the valve core and the valve body, the first end of the valve core is communicated with the first oil port, and a second end of the valve core is communicated with the second oil port; in response to hydraulic oil in the oil drain valve flows from the first oil port to the second oil port, the valve core is configured to switch from the second working position to the first working position under an action of the elastic element; in response to the hydraulic oil in the oil drain valve flows from the second oil port to the first oil port, the valve core is configured to compress the elastic element and switch from the first working position to the second working position; and a flow quantity of the oil drain valve in response to the valve core operates in the second working position is less than a flow quantity of the oil drain valve in response to the valve core operates in the first working position; wherein an oil passage is provided in the valve body; a first back cavity is formed between the first end of the valve core and the valve body, and the elastic element is provided in the first back cavity; the oil passage is configured to communicate with the first back cavity and the first oil port to form a first feedback oil path; and the second end of the valve core is provided with a cavity communicated with the second oil port; a side wall of the cavity is provided with a first oil hole, and the cavity is communicated with the first oil port through the first oil hole; an open degree of the first oil hole in response to that the valve core operates in the first working position is larger than an open degree of the first oil hole in response to that the valve core operates in the second working position; wherein the valve body comprises a valve seat and a valve sleeve; the first oil port and the second oil port are both provided on the valve seat, and the valve seat is provided with a valve core cavity; the valve sleeve is fixedly provided in the valve core cavity, and the valve core is slidably provided in the valve sleeve; a second oil hole is provided on a side wall of the valve sleeve, and the second oil hole is communicated with the first oil port and the first oil hole.
2 . The oil drain valve of claim 1 , wherein in response to the valve core operates in the first working position and the second working position, the elastic element is in a compressed state, and an elastic force of the elastic element in response to the valve core operates in the first working position is smaller than an elastic force in response to the valve core operates in the second working position.
3 . The oil drain valve of claim 1 , further comprising a damping element provided on the first feedback oil path.
4 . The oil drain valve of claim 3 , wherein the damping element is any one of a damping hole, a damper and an electronically controlled proportional flow valve.
5 . The oil drain valve of claim 1 , wherein the first back cavity is formed between the first end of the valve core and a first end of the valve sleeve; the valve sleeve is provided with a damping hole, and the damping hole is communicated with the first back cavity and the oil passage.
6 . The oil drain valve of claim 1 , wherein an inner surface of the valve core cavity is provided with a first annular guide groove, and an inner surface of the valve sleeve is provided with a second annular guide groove; the first oil port, the first annular guide groove, the second oil hole and the second annular guide groove are communicated with the first oil hole in sequence; and the first oil hole comprises a plurality of first through holes provided on the side wall of the cavity and distributed along a circumferential direction of the valve core, and the second oil hole comprises a plurality of second through holes provided on the side wall of the valve sleeve and distributed along a circumferential direction of the valve sleeve.
7 . The oil drain valve of claim 1 , wherein the first oil hole comprises a plurality of first through holes provided on the side wall of the cavity and distributed along an axial direction of the valve core, and a diameter of a first through hole near the second end of the valve core is smaller than a diameter of a first through hole away from the second end of the valve core.
8 . The oil drain valve of claim 1 , wherein the elastic element is a return spring.
9 . An energy accumulation device, comprising an accumulator and the oil drain valve of claim 1 , wherein the oil drain valve is installed at an oil outlet of the accumulator, and the oil outlet of the accumulator is communicated with the second oil port.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation application of International Application No. PCT/CN2022/073532, filed on Jan. 24, 2022, which claims priority to Chinese Patent Application No. 202111154736.0, filed on Sep. 29, 2021. The disclosures of the above-mentioned applications are incorporated herein by reference in their entireties. TECHNICAL FIELD The present application relates to the technical field of hydraulic systems, and in particular to an oil drain valve, an energy accumulation device, a hydraulic system and a working machine. BACKGROUND At present, in some hydraulic systems, accumulators are usually installed to store or recover hydraulic energy in the hydraulic system and release it in response to that needed to save energy. For example, during the operation of concrete pumping equipment, a set of hydraulic cylinders in the hydraulic system drive the S-tube valve to reciprocate in the hopper. Such that the concrete in the hopper is transported into the concrete pumping pipe through the delivery cylinder to realize the delivery of concrete. An accumulator is provided on the oil inlet line of the hydraulic cylinder, which collects hydraulic energy in response to that the accumulator is filled with oil, and replenishes hydraulic oil to the hydraulic cylinder in response to that the accumulator is drained. However, in the related art, the hydraulic oil flow output by the accumulator in the hydraulic system is not controlled during the oil discharge process. At the end of the cylinder stroke, the piston usually stops under the action of rigid impact force, which is easy to damage the cylinder. SUMMARY The main purpose of the present application is to provide an oil drain valve, an energy accumulation device, a hydraulic system and a working machine, aiming to solve the problem in the related art that the accumulator of the hydraulic system easily causes impact damage to the oil cylinder during the oil discharge process. The present application provides an oil drain valve including a valve body, a valve core and an elastic element. The valve body is provided with a first oil port and a second oil port, and the valve core is provided between the first oil port and the second oil port; the valve core is communicated with the first oil port and the second oil port, and the valve core is movable in the valve body to switch from a first working position to a second working position; the elastic element is provided between a first end of the valve core and the valve body, the first end of the valve core is communicated with the first oil port, and a second end of the valve core is communicated with the second oil port. In response to that hydraulic oil in the oil drain valve flows from the first oil port to the second oil port, the valve core is configured to switch from the second working position to the first working position under an action of the elastic element. In response to that the hydraulic oil in the oil drain valve flows from the second oil port to the first oil port, the valve core is configured to compress the elastic element and switch from the first working position to the second working position. A flow quantity of the oil drain valve in response to that the valve core operates in the second working position is less than a flow quantity of the oil drain valve in response to that the valve core operates in the first working position. In the oil drain valve according to some embodiments, in response to that the valve core operates in the first working position and the second working position, the elastic element is in a compressed state, and an elastic force of the elastic element in response to that the valve core operates in the first working position is smaller than an elastic force in response to that the valve core operates in the second working position. In the oil drain valve according to some embodiments, a limiter is provided on the valve body, and in response to that the valve core operates in the first working position, the limiter prevents the valve core from moving away from the second working position. In some embodiments, an oil passage is provided in the valve body; a first back cavity is formed between the first end of the valve core and the valve body, and the elastic element is provided in the first back cavity; the oil passage is configured to communicate with the first back cavity and the first oil port to form a first feedback oil path; and the second end of the valve core is provided with a cavity communicated with the second oil port; a side wall of the cavity is provided with a first oil hole, and the cavity is communicated with the first oil port through the first oil hole; an open degree of the first oil hole in response to that the valve core operates in the first working position is larger than an open degree of the first oil hole in response to that the valve core operates in the second working position. In the oil drain valve acc