CN203488786U

CN203488786U - Multiway valve body

Info

Publication number: CN203488786U
Application number: CN201320524658.3U
Authority: CN
Inventors: 薛源; 孙辉; 翟海燕
Original assignee: Jiangsu XCMG Construction Machinery Institute Co Ltd
Current assignee: Jiangsu XCMG Construction Machinery Institute Co Ltd
Priority date: 2013-08-26
Filing date: 2013-08-26
Publication date: 2014-03-19
Anticipated expiration: 2023-08-26

Abstract

The utility model discloses a multiway valve body. The oil way at an outlet of a third check valve (34) is divided into an oil way C and an oil way D, the oil way C is communicated with a working oil port A downwards through a main valve core (36) and a first throttling groove (37), and system returned oil enters an oil return port T through a working oil port B, the main valve core and a third throttling groove (310). The oil way D is communicated with the working oil port B through the main valve core and the third throttling groove rightwards, and the system returned oil enters the oil return port T through the working oil port A, the main valve core and a first throttling groove. According to the multiway valve body, two oil ways are led out of the outlet of the check valve, quantity of the check valves is reduced, cost is low, machining and assembling procedures are simple, and enough space is provided for reasonably arranging long double-head stud inserting holes. The long stud inserting holes are formed in the positions close to high-pressure oil ports communicated to each other and positioned among valve blocks to achieve strengthening seal of the valve blocks. The installation axis of the check valve, the axis of the oil way in front of the check valve and the axis of the oil way at the back of the check valve are designed on the same plane, and therefore, the thickness of the valve body is reduced.

Description

Multichannel valve body

Technical field

The utility model relates to a kind of multichannel valve body, specifically a kind of multichannel valve body that is applicable to load-sensitive and non-loading sensitive.

Background technique

In load sensitive system, induced pressure feeds back to variable displacement pump, and controlled variable pump is the required hydraulic power of output system only, reduces to greatest extent power loss.For the one-way flow of pilot pressure oil from oil inlet P to valve body actuator port, in valve body oil duct, conventionally one-way valve to be set, the mounting type of one-way valve when being subject to valve body self oil duct to move towards impact also to valve body on the layout of other structural types exert an influence.

In the load sensing multi-way valve of prior art, one-way valve is arranged between compensating spool outlet and the import of main valve plug actuator port.In existing valve body design, there is the mounting type of two kinds of one-way valves, a kind of is to adopt two one-way valves, as shown in Figure 1, by the duct 12 at valve body one 11 tops, utilizes screw plug 13 that one-way valve one 14 symmetries are arranged in oil duct; The second adopts single one-way valve, as shown in Figure 2, mounting hole 22 is set on the sidewall of valve body 2 21 middle and lower parts, one-way valve 2 23 is arranged in the sidewall of valve block, when multi-way valve is assembled, by being mutually adjacent between adjacent valve block, with spring, one-way valve is held out against.

The technical problem that prior art exists is: 1, the first mounting type adopts two one-way valves, and cost is higher, and processing and assembly process are more complicated.The symmetrical mounting type of one-way valve spatially affects the layout of double end long threaded rod jack.As shown in Figure 1, four double end long threaded rod jacks are arranged in valve body middle and lower part, near load-sensitive feedback hydraulic fluid port, do not arrange that double-screw bolt jack steps up, and this has caused weakening to multi-way valve integral sealing effect.2, in the second mounting type, the axial direction of one-way valve is vertical with body wall, and this valve body thickness is bigger than normal, and the overall structure of multi-way valve takes up room more, to whole machine installation, brings more inconvenience.

Model utility content

The problem existing for above-mentioned prior art, the utility model provides a kind of multichannel valve body, only needs to adopt an one-way valve, and with low cost, processing and assembling operation is simple; For reasonable Arrangement double end long threaded rod jack provides adequate space, and sealing reliability is significantly improved; Reduce valve body thickness simultaneously, make the overall structure of multi-way valve compacter, on mounting type, reduce to take up room, be convenient to the installation of complete machine.

To achieve these goals, the utility model is divided into two oil ducts at the outlet oil circuit of one-way valve three, oil duct C and oil duct D;

Oil duct C is communicated with the upper left actuator port A of valve block body by main valve plug and throttling groove one downwards, and system oil return enters oil return inlet T by the top-right actuator port B of valve block body, main valve plug and throttling groove three;

Oil duct D is communicated with the top-right actuator port B of valve block body by main valve plug and throttling groove three to the right, and system oil return enters oil return inlet T by the upper left actuator port A of valve block body, main valve plug and throttling groove one.

On valve block body, be furnished with four double end long threaded rod jacks, jack one, jack two, jack three and jack four;

Between the bottom oil return mouth T of valve block body and main valve plug, arrange jack one;

Jack two is arranged on right side at the top of valve block body feedback hydraulic fluid port;

In the middle part of valve block body compensating spool arranged on left and right sides, arrange respectively jack three and jack four.

In the top left side of valve block body, be provided with the threaded mounting hole of one-way valve three, the parallel sidewalls of the axial direction of this threaded mounting hole and valve block body, one-way valve three is installed along the axial direction of this threaded mounting hole.

Compared with prior art, the beneficial effect of this multichannel valve body is:

1, utilize two oil ducts, oil duct C and oil duct D guide to two working holes in left and right by the high pressure oil of one-way valve outlet simultaneously, then by the stroke of main valve plug, select working hole, so just an one-way valve can be only set in valve body, with low cost, processing and assembling operation is simple, thereby provides adequate space for reasonable Arrangement double end long threaded rod jack.

2, passage between each valve body of multi-way valve comprises oil inlet P, oil return inlet T and load-sensitive feedback hydraulic fluid port, between these hydraulic fluid ports, rely on seal with O ring, during sealing, O shape circle needs certain pretightening force, and the flatness error of body wall processing and the error of perpendicularity of stay bolt jack opposing sidewalls sidewall generation gap all can cause valve body with valve body laminating time, if at this moment there is no double end long threaded rod near sealing configuration forces to step up, sealing effect will be affected, especially in filler opening and load-sensitive feedback these two zone of high pressure of hydraulic fluid port, Sealing is very likely squeezed into gap to be caused seal failure and produces leakage of oil, so if space allows when valve body designs, double end long threaded rod jack should be arranged near high pressure hydraulic fluid port as far as possible.In the utility model, two double end long threaded rod jacks have been arranged in the high pressure oil area of P mouth, a jack has been arranged in the low pressure seal region of oil return inlet T, the load-sensitive feedback high pressure oil area at top is also provided with a jack, and this has greatly strengthened hydraulic fluid port and has sealed the especially reliability of high pressure hydraulic fluid port sealing.

What 3, link up due to one-way valve is compensating spool outlet oil circuit and main valve plug import oil circuit, if adopt in the prior art the one-way valve axis mounting type vertical with body wall, just require valve body thickness size must be greater than one-way valve axial length and above-mentioned two oil circuit latus rectum size sums, for safety, body wall also will leave certain thickness surplus and maintain duct internal pressure, and this just causes valve body thickness bigger than normal.And the axis place of the import oil circuit of the utility model requirement axis of one-way valve and the outlet oil circuit of compensating spool and main valve plug is at grade, can significantly reduce like this thickness of valve body, thereby make the structure of multi-way valve compacter, be convenient to install.

Accompanying drawing explanation

Fig. 1 is the front section view of the symmetrical multichannel valve body of installing of available technology adopting double check valve;

Fig. 2 is the side sectional view of the multichannel valve body of the single one-way valve vertical sidewall installation of available technology adopting;

Fig. 3 is the front section view of the utility model multichannel valve body.

In figure: 11, valve body one, 12, duct, 13, screw plug, 14, one-way valve one, 21, valve body two, 22, mounting hole, 23, one-way valve two, 31, jack two, 32, compensating spool, 33, valve block body, 34, one-way valve three, 35, jack three, 36, main valve plug, 37, throttling groove one, 38, throttling groove two, 39, jack one, 310, throttling groove three, 311, jack four.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described further.

As shown in Figure 3, the outlet oil circuit at one-way valve 3 34 is divided into two oil ducts, oil duct C and oil duct D;

Oil duct C is communicated with the upper left actuator port A of valve block body 33 by main valve plug 36 and throttling groove 1 downwards, and system oil return enters oil return inlet T by the top-right actuator port B of valve block body 33, main valve plug 36 and throttling groove 3 310;

Oil duct D is communicated with the top-right actuator port B of valve block body 33 by main valve plug 36 and throttling groove 3 310 to the right, and system oil return enters oil return inlet T by the upper left actuator port A of valve block body 33, main valve plug 36 and throttling groove 1.

On valve block body 33, be furnished with four double end long threaded rod jacks, jack 1, jack 2 31, jack 3 35 and jack 4 311;

Between the bottom oil return mouth T of valve block body 33 and main valve plug 36, arrange jack 1;

Jack 2 31 is arranged on right side at the top of valve block body 33 feedback hydraulic fluid port;

At the middle part of valve block body 33, compensating spool 32 arranged on left and right sides are arranged respectively jack 3 35 and jack 4 311.

In the top left side of valve block body 33, be provided with the threaded mounting hole of one-way valve 3 34, the parallel sidewalls of the axial direction of this threaded mounting hole and valve block body 33, one-way valve 3 34 is installed along the axial direction of this threaded mounting hole.

The working procedure of this multichannel valve body is: the high pressure oil that oil inlet P attracts enters recuperation valve chamber after throttling groove 2 38 throttlings of main valve plug 36, by the high pressure oil of compensating spool 32, push the one-way valve 3 34 of valve block body 33 top left side open, one-way valve 3 34 outlet oil ducts are divided into two, article one, be oil duct C, by main valve plug 36, throttling groove 1, be communicated with the upper left actuator port A of valve block body 33 downwards, system oil return enters oil return inlet T by valve block body 33 upper right B actuator ports through main valve plug 36, throttling groove 3 310; Another is oil duct D, is communicated with to the right by main valve plug 36, throttling groove 3 310 with the top-right actuator port B of valve block body 33, and system oil return enters oil return inlet T by the upper left actuator port A of valve block body 33 through main valve plug 36 and throttling groove 1.

This multichannel valve body is drawn two oil ducts in the outlet of an one-way valve and is communicated with A, two working holes of B respectively, thereby reduced the one-way valve quantity in valve body, with low cost, processing and assembling operation is simple, for reasonable Arrangement double end long threaded rod jack provides adequate space; Long threaded rod jack is set in order to step up valve block reinforced seal near the high pressure hydraulic fluid port communicating between valve block; The thickness that one-way valve is installed axis and before and after it, axis designs of oil duct has reduced valve body in same plane, is convenient to the installation of complete machine.

Claims

1. a multichannel valve body, is characterized in that, at the outlet oil circuit of one-way valve three (34), is divided into two oil ducts, oil duct C and oil duct D;

Oil duct C is communicated with the upper left actuator port A of valve block body (33) by main valve plug (36) and throttling groove one (37) downwards, and system oil return enters oil return inlet T by the top-right actuator port B of valve block body (33), main valve plug (36) and throttling groove three (310);

Oil duct D is communicated with the top-right actuator port B of valve block body (33) by main valve plug (36) and throttling groove three (310) to the right, and system oil return enters oil return inlet T by the upper left actuator port A of valve block body (33), main valve plug (36) and throttling groove one (37).

2. a kind of multichannel valve body according to claim 1, is characterized in that, is furnished with four double end long threaded rod jacks on valve block body (33), jack one (39), jack two (31), jack three (35) and jack four (311);

Between the bottom oil return mouth T of valve block body (33) and main valve plug (36), arrange jack one (39);

Jack two (31) is arranged on right side at the top of valve block body (33) feedback hydraulic fluid port;

Middle part compensating spool (32) arranged on left and right sides at valve block body (33) is arranged respectively jack three (35) and jack four (311).

3. a kind of multichannel valve body according to claim 1 and 2, it is characterized in that, in the top left side of valve block body (33), be provided with the threaded mounting hole of one-way valve three (34), the parallel sidewalls of the axial direction of this threaded mounting hole and valve block body (33), one-way valve three (34) axial directions along this threaded mounting hole are installed.