CN111379608A

CN111379608A - Pressure control valve based on double-switch electromagnetic valve

Info

Publication number: CN111379608A
Application number: CN201811626232.2A
Authority: CN
Inventors: 陈丽月; 李晖
Original assignee: Hunan Tengzhi Electromechanical Co ltd
Current assignee: Hunan Tengzhi Electromechanical Co ltd
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2020-07-07

Abstract

The invention provides a pressure control valve based on a double-switch electromagnetic valve, which is invented for solving the difficulty in the prior hydraulic proportional valve technology. The two switching electromagnetic valves enable the pressure control valve to have four different pressure control modes under the combined action of oil pressure and spring force under four different combination states of closing, opening and closing. The invention has the advantages of small volume, compact structure, light weight, simple and reliable control mode logic, quick response, stable pressure control, small pressure fluctuation and the like.

Description

Pressure control valve based on double-switch electromagnetic valve

Technical Field

The invention relates to the technical field of multi-stage variable displacement pumps, in particular to a pressure control valve.

Background

Based on the increasing development of the energy-saving and emission-reducing technology of automobiles, the continuous variable displacement oil pump of the electro-hydraulic proportional technology gradually becomes a preferred target of the development of a new generation of engine, and the electro-hydraulic proportional valve is controlled by different duty ratios to enable the oil pump to obtain different performance outputs to meet the pressure requirements of the engine under different working conditions. However, the electro-hydraulic proportional valve has a contradiction between the response characteristic, the pressure control precision and the stability and reliability of the pressure, and meanwhile, the matching of the electro-hydraulic proportional valve and the mechanical part of the oil pump and the matching of the engine control unit ECU and the oil pump assembly increase the design and manufacture difficulty and the calibration complexity of the oil pump, and the pressure control valve based on the double-switch electromagnetic valve is combined with the variable displacement oil pump, so that the aim of the electro-hydraulic proportional variable oil pump technology can be achieved, and the matching complexity between the engine control unit and the oil pump cannot be increased.

Disclosure of Invention

The invention aims to provide a novel pressure control valve.

The technical scheme of the invention is as follows: the utility model provides a pressure control valve based on two switch solenoid valves, includes valve body (2) that have the inner chamber, installs case (6), switch solenoid valve A (1), switch solenoid valve B (3), first control chamber (10), second control chamber (11), transfer chamber (5), gas vent (15), end cap (8), spring (7) in valve body (2) inner chamber. The pressure control valve is characterized by comprising a valve body (2) with an inner cavity and a valve core (6) arranged in the inner cavity of the valve body (2), wherein two control cavities which are not communicated with each other are formed between one end of the valve core (6) and the inner cavity wall of the valve body (2), a spring (7) is arranged at the other end of the valve core (6), a transfer chamber (5) is formed between the middle part of the valve core (6) and the inner cavity wall of the valve body (2), the two control cavities are respectively communicated with a main oil inlet (3) through oil ways, and an on-off electromagnetic valve is respectively arranged on the oil ways between the two control cavities and the main oil inlet (3); the position of the valve core (6) in the inner cavity of the valve body (2) is determined by the elastic force of the spring (7) and the hydraulic pressure in the two control cavities. In one embodiment, two control cavities in the pressure control valve are a first control cavity (10) and a second control cavity (11), wherein the first control cavity (10) is controlled by a solenoid valve A, and the second control cavity (11) is controlled by a solenoid valve B; the electromagnetic valve A (1) and the electromagnetic valve B (4) are respectively opened and closed, and can be jointly combined into four different states of A-switch-B-switch, A-switch-B-switch and A-switch-B-switch, so that the pressure control valve has four different pressure control modes.

In one embodiment, the first control cavity (10) is a cavity formed between the end face of one end of the valve core (6) and the inner cavity wall of the valve body (2), and the second control cavity (11) is an annular cavity formed between the peripheral surface of one end of the valve core (6) and the inner cavity wall of the valve body (2).

In one embodiment, the valve body (2) and the pump body are integrally formed.

The invention has the beneficial effects that: two control cavities in the pressure control valve are respectively a first control cavity (10) and a second control cavity (11), the first control cavity (10) and the second control cavity (11) are controlled by respectively opening and closing an electromagnetic valve A and an electromagnetic valve B, and four different states of A-switch-B-switch, A-switch-B-switch and A-switch-B-switch can be combined together, so that the pressure control valve has four different pressure control modes. The pressure control valve of the double-switch electromagnetic valve is combined with the variable displacement oil pump, the aim of the electro-hydraulic proportional variable oil pump technology can be achieved, the power saving is very close to that of a continuous variable displacement oil pump controlled by the electro-hydraulic proportional valve, and the matching complexity between an engine control unit and the oil pump cannot be increased; the control mode of the invention has simple and reliable logic, rapid response, stable pressure control, small pressure fluctuation, simple process and low cost.

Drawings

FIG. 1 is a cross-sectional view of an assembly of the present invention;

fig. 2 is an external view of the present invention.

The reference signs are:

1-electromagnetic valve A2-valve body 3-main oil inlet

4-electromagnetic valve B5-transfer chamber 6-valve core

7-spring 8-plug 9-sealing element

10-first control chamber 11-second control chamber 12-T port

13-port a 14-port P15-exhaust port.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and fig. 1, which are not intended to limit the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or interconnected between two elements, directly or indirectly through intervening media, and the specific meaning of the terms may be understood by those skilled in the art according to their specific situation.

As shown in fig. 1, the preferred embodiment of the present invention is: a pressure control valve based on a double-switch electromagnetic valve comprises a valve body (2) with an inner cavity and a valve core (6) arranged in the inner cavity of the valve body (2), wherein two control cavities (4) and (5) which are not communicated with each other are formed between one end of the valve core (6) and the wall of the inner cavity of the valve body (2), a spring (7) is arranged at the other end of the valve core (6), the other end of the spring (7) is connected with a plug (8), a transfer chamber (5) is formed between the middle part of the valve core (6) and the wall of the inner cavity of the valve body (2), the two control cavities (4) and (5) are respectively communicated with a main oil duct through oil passages, and the oil passages between the two control cavities (4) and (5) and a main oil inlet (3; the position of the valve core (6) in the inner cavity of the valve body (2) is determined by the elastic force of the spring (7) and the hydraulic pressure in the two control cavities, and the valve body (2) is integrally formed.

As shown in fig. 1, two control chambers in the pressure control valve are respectively a first control chamber (10) and a second control chamber (11), the first control chamber (10) is a chamber formed between an end face of one end of the valve core (6) and an inner chamber wall of the valve body (2), and the second control chamber (11) is an annular chamber formed between a circumferential surface of one end of the valve core (6) and the inner chamber wall of the valve body (2); the first control cavity (10) is controlled by an electromagnetic valve A (1), and the second control cavity (11) is controlled by an electromagnetic valve B (4); the electromagnetic valve A (2) and the electromagnetic valve B (3) are respectively opened and closed, and can be jointly combined into four different states of A-switch-B-switch, A-switch-B-switch and A-switch-B-switch, so that the pressure control valve has four different pressure control modes.

The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit and scope of the present invention.

Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.

Claims

1. A pressure control valve based on a double-switch electromagnetic valve comprises a valve body (2) with an inner cavity, a switch electromagnetic valve A (1), a switch electromagnetic valve B (4), a main oil inlet (3), a transfer chamber (5), a valve core (6) installed in the inner cavity of the valve body (2), a spring (7), a plug (8), a sealing element (9), a first control cavity (10), a second control cavity (11), a T opening (12), an A opening (13), a P opening (14) and an exhaust opening (15); the valve core (6) is provided with a small limiting step; two control cavities (10) and (11) which are not communicated with each other are formed between one end of the valve core (6) and the inner cavity wall of the valve body (2), a spring (7) is arranged at the other end of the valve core (6), a transfer chamber (5) is formed between the middle part of the valve core (6) and the inner cavity wall of the valve body (2), and the two control cavities (10) and (11) are communicated with the main oil duct (3) through oil passages and a switching electromagnetic valve respectively; the position of the valve core (6) in the inner cavity of the valve body (2) is determined by the elastic force of the spring (7) and the hydraulic pressure in the two control cavities.

2. The pressure control valve based on the double-open solenoid valve as claimed in claim 1, wherein: the pressure control valve is provided with two switch electromagnetic valves, namely a switch electromagnetic valve A (1) and a switch electromagnetic valve B (4).

3. A pressure control valve based on a dual-switching solenoid valve as claimed in claim 1, wherein: a T port (12), an A port (13) and a P port (14) are arranged on a valve body (2) of the pressure control valve; when the hydraulic pressure in the two control cavities is larger than the elastic force of the spring (7), the hydraulic pressure pushes the valve core (6) to move towards the end of the spring (7), the port A (13) is not communicated with the port T (12), the port A (13) is communicated with the port P (14) through the transfer chamber (5), when the spring force is equal to the liquid pressure, the set pressure is obtained, and the valve core (6) is located in a balanced state; when the hydraulic pressure in the two control cavities is smaller than the elastic force of the spring (7), the spring (7) pushes the valve core (6) to move towards the control cavity end, the port A (13) is not communicated with the port P (14), the port A (13) is communicated with the port T (12) through the transfer chamber (5), and when the valve core (6) reaches the limit position, the set pressure is obtained.

4. The pressure control valve based on the double-switch electromagnetic valve as claimed in claim 1 or 2, wherein two control cavities in the pressure control valve are a first control cavity (10) and a second control cavity (11), respectively, the first control cavity (10) is controlled by the switch electromagnetic valve A (1), and the second control cavity (11) is controlled by the switch electromagnetic valve B (4); the pressure control valve can be combined into four different states of A-switch B-switch, A-switch B-switch and A-switch B-switch by respectively opening and closing the switch electromagnetic valve A (1) and the switch electromagnetic valve B (4), so that the pressure control valve can form four different pressure control modes.

5. The pressure control valve based on the double-switching solenoid valve as claimed in claim 4, wherein: the first control cavity (10) is a cavity formed between the end face of one end of the valve core (6) and the inner cavity wall of the valve body (2), and the second control cavity (11) is an annular cavity formed between the peripheral face of one end of the valve core (6) and the inner cavity wall of the valve body (2).

6. The pressure control valve based on the double-switching solenoid valve as claimed in claim 1 or 2, wherein: the valve body (2) is integrally formed.