CN110701124A

CN110701124A - Hydraulic valve and hydraulic system

Info

Publication number: CN110701124A
Application number: CN201810743538.XA
Authority: CN
Inventors: 汪星晨
Original assignee: Bosch Rexroth Beijing Hydraulic Co Ltd
Current assignee: Bosch Rexroth Beijing Hydraulic Co Ltd
Priority date: 2018-07-09
Filing date: 2018-07-09
Publication date: 2020-01-17

Abstract

The application provides a hydraulic valve, the hydraulic valve includes: the valve body is provided with at least one working port; a spool provided with at least one lock groove and configured to be movable in a longitudinal axis direction of the spool within the valve body; a spool lock device including an electromagnet and a lock pin configured to be able to enter into or escape from the lock groove by the electromagnet; wherein the locking pin is configured to be movably received within the channel of the valve body. In addition, the application also provides a hydraulic system comprising the hydraulic valve and the current switch. The hydraulic valve and the hydraulic system are simple and compact in structure and low in cost.

Description

Hydraulic valve and hydraulic system

Technical Field

The present disclosure relates to a hydraulic valve, and more particularly, to a hydraulic valve having a spool locking device, and a hydraulic system including the hydraulic valve.

Background

Hydraulic valves are widely used to regulate the communication of a pressure medium (e.g. hydraulic oil) with a respective line according to the requirements of the system. Hydraulic valves typically include a valve spool and a valve body within which the valve spool slides. When the valve core of the hydraulic valve is in a working position, the pressure medium is communicated with the working pipeline to drive the corresponding executing component to move, so that the preset action is completed. For safety reasons, it is generally necessary to mechanically limit the position of the spool to maintain it in the working or neutral position (or neutral position).

The spool lock device of the prior art hydraulic valve generally includes an electromagnet, a lock pin, and a housing, the lock pin being accommodated in the housing, and the electromagnet being mounted on the housing. The electromagnet drives the locking pin to move according to an electric signal applied by a control system, so that the locking pin enters or is separated from the locking groove on the valve core. When the locking pin enters a locking groove on the valve core, the valve core is fixed along the longitudinal axis direction and can not move relative to the valve body, so that the valve core is kept locked in a certain position. When the locking pin is disengaged from the locking groove on the valve core under the action of the electromagnet, the valve core can move along the longitudinal axis direction of the valve core, and therefore the valve core can be driven to a corresponding position. However, such a spool lock is provided as a relatively separate component outside the hydraulic valve and mechanically fixes the housing to one side of the valve body of the hydraulic valve, for example, the left or right side of the valve body of the hydraulic valve. Accordingly, additional devices (e.g., return springs, etc.) at the ends of the spool must be secured to the housing of the spool lock, thereby forming the entire hydraulic valve. Therefore, the whole hydraulic valve is complex in structure, high in cost and large in occupied space.

Therefore, there is a need for a hydraulic valve having a spool lock device that is simple and compact in construction and low in cost.

Disclosure of Invention

The object of the present application is to propose an improved hydraulic valve that overcomes at least one of the above-mentioned drawbacks of the prior art.

To this end, according to an aspect of the present application, there is provided a hydraulic valve including: the valve body is provided with at least one working port; a spool provided with at least one lock groove and configured to be movable in a longitudinal axis direction of the spool within the valve body; a spool lock device including an electromagnet and a lock pin configured to be able to enter into or escape from the lock groove by the electromagnet; wherein the locking pin is configured to be movably received within the channel of the valve body.

Preferably, the valve body is provided with at least two working ports, one of which communicates with the passage.

Preferably, the electromagnet is mounted on the top of the valve body by bolts.

Preferably, the locking groove is configured to be rotationally symmetric with respect to the longitudinal axis.

Preferably, at least one end of the valve core is provided with a spring.

Preferably, the locking pin is movable perpendicular to the longitudinal axis under the action of the electromagnet.

Preferably, the spool is provided with a plurality of notches for communication with the at least one workport.

According to another aspect of the present application, there is also provided a hydraulic system, including: the hydraulic valve described above; and a current switch connected to the solenoid of the hydraulic valve and configured to be switched on under appropriate triggering conditions.

Preferably, the trigger condition is at least one of position, pressure, temperature.

Preferably, the hydraulic system is configured such that when the current switch is switched off, the spool lock means locks the hydraulic valve and when the current switch is switched on, the spool lock means unlocks the hydraulic valve such that a spool of the hydraulic valve is movable along a longitudinal axis thereof.

The hydraulic valve simplifies the structure of the whole hydraulic valve, reduces the number of parts, makes the structure simpler and more compact, further simplifies the installation process and maintenance operation, and reduces the cost.

Drawings

Exemplary embodiments of the present application will be described in detail below with reference to the attached drawings, it being understood that the following described embodiments are merely illustrative of the present application and do not limit the scope of the present application, and in which:

FIG. 1 is a schematic partial cross-sectional view of a hydraulic valve according to an embodiment of the present application, wherein the hydraulic valve is in a locked state;

FIG. 2 is another schematic partial cross-sectional view of the hydraulic valve shown in FIG. 1, wherein the hydraulic valve is in an unlocked state;

FIG. 3 is a schematic partial cross-sectional view of a hydraulic valve according to another embodiment of the present application, wherein the hydraulic valve is in a locked state.

In the various figures of the present application, features that are structurally identical or functionally similar are denoted by the same reference numerals.

Description of reference numerals: a valve body 10; a first working port 11; a liquid inlet 12; a liquid return port 13; a second working port 14; a spring 15; a channel 16; a valve core 20; a locking groove 21; a spool lock device 30; an electromagnet 31; a locking pin 32.

Detailed Description

Preferred embodiments of the present application are described in detail below with reference to examples. However, it should be understood by those skilled in the art that these exemplary embodiments are not meant to limit the present application in any way. Furthermore, the features in the embodiments of the present application may be combined with each other without conflict. In the drawings, other components have been omitted for the sake of brevity, but this does not indicate that the hydraulic valve and hydraulic system of the present application may not include other components. It should be understood that the sizes, proportions and numbers of elements in the drawings are not intended to limit the present application.

Fig. 1 and 2 show schematic partial cross-sectional views of a hydraulic valve according to an embodiment of the present application, wherein the hydraulic valve of fig. 1 is shown in a locked state and the hydraulic valve of fig. 2 is shown in an unlocked state. As shown in fig. 1 and 2, the hydraulic valve generally includes a valve body 10, a valve spool 20, and a spool lock device 30.

The valve body 10 is generally provided with a working port 11, a liquid inlet 12 and a liquid return port 13, wherein the working port 11 is connected with an execution component, so that the output of the working port 11 can drive the execution component to act; the inlet port 12 is coupled to a supply fluid path, e.g., a pump (not shown); the return port 13 is coupled to a return fluid path, such as a tank. When the hydraulic valve works, the liquid inlet 12 is communicated with or disconnected from the working port 11 along with the movement of the valve core 20, so that the hydraulic valve is in a working state or a neutral state. It should be noted that only one working port 11 is shown in fig. 1 and 2, but the applicant also envisages that the hydraulic valve of the present application may be provided with a plurality of working ports, for example 2, 3, 4 or more.

The valve core 20 is a substantially cylindrical member provided with a plurality of cut grooves (not shown in the drawings) at substantially the middle position for communicating with the workport 11 so that liquid can be communicated or disconnected between the liquid inlet port 12, the workport 11, and the liquid return port 13. Further, the spool 20 is also provided with a lock groove 21, for example, at a position near one end of the spool. One or both ends of the valve spool 20 may be provided with a spring 15 to cause the valve spool 20 to tend to remain in a certain position, e.g., a neutral position. The valve spool 20 is configured to be movable in the longitudinal axis direction thereof within the valve body 10, for example, in the left-right direction in fig. 1 and 2. According to an embodiment of the application, the locking groove 21 is configured rotationally symmetric with respect to the longitudinal axis of the spool 20, e.g. an annular locking groove. Of course, the lock groove 21 of the present application may be in any form capable of cooperating with the lock pin 32, for example, a notch provided at a position corresponding to the lock pin 32 on the valve body 20. In the case where the lock groove 21 is of a non-rotationally symmetrical configuration, the spool 20 will typically be provided with an alignment mechanism to ensure alignment of the lock pin 32 and the lock groove 21.

The spool lock device 30 generally includes an electromagnet 31 and a lock pin 32, the lock pin 32 being movable relative to the electromagnet 31 by the electromagnet 31. For example, at least a part of the locking pin 32 is pulled into the electromagnet 31 when the electromagnet 31 is on, and at least a part of the locking pin 32 is withdrawn from the electromagnet 31 when the electromagnet 31 is off. Thus, the locking pin 32 can be inserted into or removed from the locking groove 21 by the electromagnet 31. When the locking pin 32 enters the locking groove 21, the spool 20 is locked to place the hydraulic valve in a locked state, and when the locking pin 32 is disengaged from the locking groove 21, the spool 20 can be moved by hydraulic pressure to place the hydraulic valve in an unlocked state.

It should be noted that the spool lock device 30 of the present application does not mount the housing containing the locking pin on the valve body side of the hydraulic valve as in the prior art, but rather the locking pin 32 is directly movably received in the channel 16 of the valve body 10. Accordingly, the electromagnet 31 may be mounted on top of the valve body 10, for example, by bolts. In this way, the locking pin 32 is movable perpendicular to the longitudinal axis of the valve core 20, for example, in the up-down direction in fig. 1 and 2, by the action of the electromagnet 31.

In general, existing hydraulic valves are generally provided with at least two working ports, wherein in case of two working ports, one is used as an executing working port, the other is used for unloading, etc. In this case, the hydraulic valve of the present application may be implemented by modifying an existing hydraulic valve, i.e., only one working port is reserved, and the other port is modified to receive the locking pin 32 of the spool lock device 30. As shown in fig. 1 and 2, the position at which the spool lock 30 is installed corresponds generally to the position of the other workport. Of course, the hydraulic valve of the present application may still maintain multiple working ports, as shown in FIG. 3, which shows a schematic partial cross-sectional view of a hydraulic valve according to another embodiment of the present application. Fig. 3 differs from fig. 1 only in that a further working port 14 opens out on one side of the valve body 10, which working port communicates with the channel (16) in which the locking pin 32 is located. In this way, the channel 16 serves both as a travel channel for the locking pin 32 and as a flow path to the other workport 14.

According to another aspect of the present application, there is also provided a hydraulic system comprising a hydraulic valve as described above and a current switch (not shown) connected to the solenoid of the hydraulic valve and configured to be switched on under appropriate triggering conditions. Thus, the input of the current signal becomes a prerequisite for the movement of the spool of the hydraulic valve. The trigger condition may be at least one of position, pressure, temperature, and, of course, may be one of any measurable variables. For example, the trigger condition may be a pressure on the driver's seat, a position of a hydraulic cylinder, or the like.

In operation, when the current switch is off, the locking pin 32 is in the locking groove 21 on the spool 20 causing the spool locking device 30 to lock the hydraulic valve, and when the current switch is on, the locking pin 32 is pulled out of the locking groove 21 by the electromagnet 31 causing the spool locking device 30 to unlock the hydraulic valve so that the spool of the hydraulic valve can move along its longitudinal axis.

According to the present application, the spool lock device omits a prior art housing by movably receiving the lock pin of the spool lock device in the passage of the valve body, and the attachment device of the spool can be directly fixed to the valve body. Therefore, the number of parts of the whole hydraulic valve is reduced, the structure is simpler and more compact, the installation process and the maintenance operation are simplified, and the cost is reduced.

The present application is described in detail above with reference to specific embodiments. It is to be understood that both the foregoing description and the embodiments shown in the drawings are to be considered exemplary and not restrictive of the application. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit of the application, and these changes and modifications do not depart from the scope of the application.

Claims

1. A hydraulic valve, comprising:

a valve body (10), said valve body (10) being provided with at least one working port (11, 14);

a spool (20), the spool (20) being provided with at least one locking groove (21), and the spool (20) being configured to be movable within the valve body (10) in a longitudinal axis direction of the spool (20);

a spool lock device (30), the spool lock device (30) including an electromagnet (31) and a lock pin (32), the lock pin (32) being configured to be able to enter into or escape from the lock groove (21) by the electromagnet (31);

characterized in that the locking pin (32) is configured to be movably received within a channel (16) of the valve body (10).

2. The hydraulic valve of claim 1, wherein: the valve body (10) is provided with at least two working ports (11, 14), one of the at least two working ports (11, 14) being in communication with the channel (16).

3. The hydraulic valve of claim 2, wherein: the electromagnet (31) is installed on the top of the valve body (10) through a bolt.

4. The hydraulic valve according to any one of claims 1 to 3, characterized in that: the locking groove (21) is configured to be rotationally symmetric with respect to the longitudinal axis.

5. The hydraulic valve according to any one of claims 1 to 3, characterized in that: at least one end of the valve core (20) is provided with a spring (15).

6. The hydraulic valve according to any one of claims 1 to 3, characterized in that: the locking pin (32) is moved perpendicular to the longitudinal axis by the electromagnet (31).

7. The hydraulic valve of claim 3, wherein: the spool (20) is provided with a plurality of notches for communication with the at least one workport (11, 14).

8. A hydraulic system, comprising:

the hydraulic valve according to any one of claims 1-7;

a current switch connected to an electromagnet (31) of the hydraulic valve and configured to be switched on under appropriate triggering conditions.

9. The hydraulic system of claim 8, wherein: the trigger condition is at least one of position, pressure, temperature.

10. The hydraulic system of claim 8, wherein: the hydraulic system is configured such that when the current switch is switched off, the spool locking means (30) locks the hydraulic valve and when the current switch is switched on, the spool locking means (30) unlocks the hydraulic valve such that a spool (20) of the hydraulic valve is movable along its longitudinal axis.