CN213575707U - Valve core and multi-way valve - Google Patents

Abstract

The utility model relates to a hydraulic pressure field, concretely relates to case and multiple unit valve. When the valve core is in a middle position state, the pilot oil can flow to an oil return way in the valve body through the communicating groove to return oil; when the valve core is reversed, pilot oil is blocked and cannot enter the communicating groove, or the communicating groove is disconnected from the oil return oil way. The multi-way valve comprises a valve body, wherein the valve core is assembled in the valve body in a sliding mode. The technical problem that pilot oil in a multi-way valve in the prior art is not easy to discharge, and then the control precision of a valve core is influenced is solved.

Description

Valve core and multi-way valve

Technical Field

The utility model relates to a hydraulic pressure field, concretely relates to case and multiple unit valve.

Background

The reversing valve is widely applied to the fields of engineering machinery, environmental sanitation machinery and the like, and mainly utilizes the movement of a valve core relative to a valve body to connect, cut off or change a path of an oil path so as to realize the starting, stopping or changing the movement direction of a hydraulic actuating element.

The multi-way directional valve is generally formed by a plurality of directional valves, wherein each directional valve is generally called a "directional valve train". The multi-way reversing valve is divided into an integral type reversing valve and a split type reversing valve (namely, a valve plate assembly type), the integral type reversing valve is provided with a shared valve body, each pair of reversing valves are formed into independent split type reversing valves, and then all the pairs of reversing valves are assembled into the multi-way reversing valve through bolts, sealing pieces and the like. Each joint reversing valve in the multi-way reversing valve generally has a shared oil inlet path and an oil return path.

In terms of operation methods, the reversing valve and the multi-way reversing valve generally have a plurality of types, such as manual type, motorized type, electromagnetic drive type, hydraulic control type, and electrohydraulic drive type, and accordingly, the control mechanism of the reversing valve and the multi-way reversing valve also has a manual control mechanism, a motorized control mechanism, an electromagnetic control mechanism (e.g., an electromagnet), a hydraulic control mechanism, and an electrohydraulic drive mechanism, and the like. The pilot-controlled multi-way valve is a device which enters a pilot end cover through pilot oil and then pushes a valve core to move and control to flow with the oil, the pilot oil in an inner cavity of the pilot end cover cannot flow circularly, the oil can deteriorate after long-term use, the oil viscosity can be changed after the oil deteriorates, the control precision of the valve core is influenced, and even the valve core is blocked.

SUMMERY OF THE UTILITY MODEL

In order to solve the difficult discharge of guide's fluid among the prior art multiple unit valve, and then influence the technical problem of the control accuracy of case, the utility model provides a case and multiple unit valve has solved above-mentioned technical problem. The technical scheme of the utility model as follows:

when the valve core is in a middle position state, the pilot oil can flow to an oil return way in the valve body through the communicating groove to return oil; when the valve core is reversed, pilot oil is blocked and cannot enter the communicating groove, or the communicating groove is disconnected from the oil return oil way.

The utility model discloses a case, through set up the intercommunication groove on the outer peripheral face at the at least one end tip of case, when the case was in the meso position, the guide's fluid can circulate to the oil return oil circuit in through the intercommunication groove with the oil return, so can discharge the guide's fluid in the multiple unit valve, the unable circulation of fluid can not appear in the guide's intracavity and flow, and the fluid is rotten appears, influences the problem of case control accuracy.

According to an embodiment of the invention, the communication groove comprises a helical groove, the helical groove extending at least helically for a circumference.

According to the utility model discloses an embodiment, the head and the tail both ends intercommunication of helicla flute has the ring channel.

According to the utility model discloses an embodiment, the case has the step that a plurality of intervals set up, the intercommunication groove sets up on the step of the axial outside.

The multi-way valve comprises a valve body, wherein the valve core is assembled in the valve body in a sliding mode.

According to the utility model discloses an embodiment, the valve body is connected with the guide end cover in order to form the guide oil pocket, the case be provided with the tip of intercommunication groove stretches to in the guide oil pocket.

According to the utility model discloses an embodiment, be provided with the oil return oil circuit in the valve body, the oil return oil circuit is close to the setting of guide's oil pocket, the axial length in intercommunication groove is greater than the oil return oil circuit with the axial interval of guide's oil pocket.

According to the utility model discloses an embodiment, the guide's oil pocket is one, the one end tip of case sets up the intercommunication groove, the other end of case is provided with adjusting part.

According to the utility model discloses an embodiment, the guide oil pocket is two, the both ends of case all are provided with the intercommunication groove, two are stretched respectively to the both ends of case in the guide oil pocket.

According to the utility model discloses an embodiment, it is two sets of the intercommunication groove symmetry sets up on the case.

Based on the technical scheme, the utility model discloses the technological effect that can realize does:

1. the utility model discloses a case, through set up the intercommunication groove on the outer peripheral face of at least one end tip of case, when the case was in the meso position, guide's fluid can circulate to the oil return oil circuit in order to return the oil and realize meso position off-load through the intercommunication groove, so can discharge guide's fluid in the multiple unit valve, the guide's intracavity can not appear fluid unable circulation flow, and appear fluid rotten, influence the problem of case control accuracy; the pilot pressure cannot be influenced by the middle unloading, the control precision of the valve core is high, and the response is fast;

2. the communicating groove of the valve core of the utility model comprises a spiral groove, and at least one spiral extends for a circle, thus, the unloading speed is fast, and compared with grooves with other shapes such as a straight groove, local clamping can be caused, the control precision and the response time of the valve core are influenced, the stress of the circumferential direction of the spiral groove is balanced, and the control precision and the response time of the valve core can not be influenced; the head end and the tail end of the spiral groove are further communicated with the annular grooves, so that the communication between the spiral groove and the oil return oil duct and the pilot oil cavity can be increased through the annular grooves, and pilot oil can be conveniently led in and flows into the oil return oil duct through the communicating groove;

3. the utility model discloses a multi-way valve adopts foretell case, and the case slides along the valve body, can switch on the oil circuit in the valve body to the realization is to the control of fluid. The end part of the valve body is arranged to form a pilot oil cavity, an oil return oil way is formed in the valve body close to the pilot oil cavity, the axial length of the communicating groove is larger than the axial distance between the oil return oil way and the pilot oil cavity, and the communicating groove can conveniently communicate the pilot oil cavity and the oil return oil way. One pilot oil cavity can be arranged, a communicating groove is arranged at the end part of one end of the valve core, an adjusting component is arranged at the other end of the valve core, and one end of the valve core, which is provided with the communicating groove, extends into the pilot oil cavity and slides along the valve body under the action of pilot oil; the two pilot oil cavities can be arranged, the end parts of the two ends of the valve core are provided with communicating grooves, pilot oil acts on the two ends of the valve core to control the valve core to slide along the valve body, and when the valve core is positioned at the middle position, the pilot oil in the two pilot oil cavities can flow to the oil return oil way through the corresponding communicating grooves, and then oil is returned.

Drawings

Fig. 1 is a schematic structural diagram of the valve element of the present invention;

FIG. 2 is an enlarged view of section C of FIG. 1;

FIG. 3 is a cross-sectional view of the multi-way valve of the present invention in a neutral position;

FIG. 4 is a cross-sectional view of the multi-way valve of the present invention in a reversing position;

in the figure: 1-a valve core; 10-a communicating groove; 101-helical groove; 102-an annular groove; 11-a first step; 12-a second step; 13-a third step; 14-a fourth step; 15-fifth step; 16-a first groove; 17-a second groove; 18-a third groove; 19-a fourth groove; 2-a valve body; 21-oil return path; 22-pressure oil circuit; 23-oil path; 24-a first branch oil path; 25-a second branch oil path; 26-a first working oil path; 27-a second working oil path; 3-a pilot end cover; 31-a pilot oil chamber; 32-a pilot oil port; 4-elastic member.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

As shown in fig. 1-4, the present embodiment provides a valve core 1, the valve core 1 is slidably assembled in a valve body 2, and the valve core 1 slides back and forth along the valve body 2 under the action of pilot oil to control the on-off of each oil path in the valve body 2. The end of the valve core 1 is formed with a communicating groove 10, when the valve core 1 is located at the middle position in the valve body 2, the pilot oil can flow into an oil return passage 21 in the valve body 2 through the communicating groove 10, and oil return of the pilot oil is realized. The defect that the control precision of the valve core 1 is influenced due to the fact that the oil is deteriorated because the pilot oil cannot circularly flow in the pilot cavity can be effectively avoided.

The valve core 1 is a rod-shaped body with a variable outer diameter, specifically, the valve core 1 extends linearly, the valve core 1 forms a plurality of steps at intervals in the axial direction, and a groove is formed between the adjacent steps. In this embodiment, the valve core 1 is provided with a first step 11, a second step 12, a third step 13, a fourth step 14 and a fifth step 15 at intervals along the axial direction, a first groove 16 is formed between the first step 11 and the second step 12, a second groove 17 is formed between the second step 12 and the third step 13, a third groove 18 is formed between the third step 13 and the fourth step 14, and a fourth groove 19 is formed between the fourth step 14 and the fifth step 15. The step and the groove on the valve core 1 are arranged corresponding to the oil way in the valve body 2, and when the step axially corresponds to the oil way, the oil way can be blocked; when two ends of the groove are respectively communicated with two adjacent oil passages, the oil passages can be communicated. Preferably, five steps are symmetrically arranged.

The communication groove 10 is provided on the outer peripheral surface of at least one end portion of the valve element 1, and in the present embodiment, the communication groove 10 is provided on the axially outermost step of the valve element 1, that is, the communication groove 10 is provided on the outer peripheral surface of the first step 11 and/or the fifth step 15 of the valve element 1. Preferably, the communication groove 10 is provided at an axially outer end of the first step 11 and/or the fifth step 15. In this embodiment, the two sets of the communicating grooves 10 are symmetrically provided on the outer peripheral surfaces of the end portions of the valve element 1.

As a preferable technical solution of this embodiment, the communicating groove 10 includes a spiral groove 101 and an annular groove 102, the spiral groove 101 extends at least one circle spirally on the valve core 1, and the annular groove 102 is respectively communicated with the head end and the tail end of the spiral groove 101. The annular groove 102 can increase the contact surface between the communicating groove 10 and the pilot oil chamber 31 and the oil return path 21, and the pilot oil can enter the communicating groove 10 conveniently to return oil. By arranging the spiral groove 101, the stress in the circumferential direction of the spiral groove 101 can be balanced, and the control precision and the response time of the valve core 1 cannot be influenced. Preferably, the spiral groove 101 is spirally wound one turn on the spool 1.

The embodiment also provides a multi-way valve which comprises a valve core 1 and a valve body 2, wherein the valve core 1 is assembled on the valve body 2 in a sliding mode and can slide along the valve body 2. Corresponding to the steps and the grooves on the valve core 1, a plurality of oil paths are arranged in the valve body 2, and the plurality of oil paths are controlled by the valve core 1 to be switched on and off.

A pressure oil path 22, a working oil path and an oil return path 21 are formed in the valve body 2, as shown in fig. 3-4, a pressure oil port P is formed on the valve body 2, the pressure oil enters the pressure oil path 22 through the pressure oil port P, hydraulic oil on the pressure oil path 22 passes through an oil path 23 to enter two branch oil paths, namely a first branch oil path 24 and a second branch oil path 25, two working oil paths are arranged outside the two branch oil paths, namely a first working oil path 26 and a second working oil path 27, the first working oil path 26 is communicated with the oil port a, the second working oil path 27 is communicated with the oil port B, two oil return paths 21 are formed outside the two working oil paths, and the two oil return paths 21 are communicated with an oil return port T on the valve body 2.

The valve core 1 is positioned in the valve body 2, and when the valve core 1 is positioned at the middle position, as shown in figure 3, all oil paths are not communicated; when the valve core 1 is located at the right position, as shown in fig. 4, the first groove 16 conducts the first branch oil path 24 and the first working oil path 26, and pressure oil can flow to the oil port a, so that oil is fed from the oil port a; the fourth groove 19 can communicate the second working oil path 27 and the oil return path 21 to realize oil return from the oil port B (the valve core 1 in fig. 4 needs to slide a part to the right to realize oil return from the oil port B); when the valve core 1 is located at the left position, the first groove 16 conducts the first working oil path 26 and the oil return path 21, so that oil return from the oil port a is realized; the fourth groove 19 communicates the second branch oil passage 25 and the second working oil passage 27, and the pressure oil can flow to the oil port B to realize oil inlet of the oil port B.

The end part of the valve body 2 is connected with a pilot end cover 3, the pilot end cover 3 and the end part of the valve body 2 form a pilot oil cavity 31, and the end part of the valve core 1 provided with the communicating groove 10 extends into the pilot oil cavity 31. When one end of the valve core 1 is provided with the communicating groove 10, the number of the pilot end covers 3 is one, one pilot end cover 3 is connected with the valve body 2 to form a pilot oil cavity 31, one end of the valve core 1 extends into the pilot end cover 3, the other end of the valve core 1 can be provided with an adjusting assembly (not shown in the figure), the adjusting assembly can comprise a spring and an adjusting piece, the adjusting piece is adjustably arranged on the axial outer side of the valve core 1 in position, the spring is positioned at two ends of the adjusting piece and the valve core 1, two ends of the spring respectively act on the adjusting piece and the valve core 1, and pilot oil can act on the valve core 1 to push the valve core 1 to slide along the.

Alternatively, two communicating grooves 10 may be formed at both ends of the valve core 1, two pilot end covers 3 may be provided, the two pilot end covers 3 are connected with both ends of the valve body 2 to form two pilot oil cavities 31, both ends of the valve core 1 extend into the two pilot oil cavities 31, and the valve core 1 slides along the valve body 2 under the action of the pilot oil at both ends. When the valve core 1 is in the middle position, one end of the communicating groove 10 is communicated with the pilot oil chamber 31, the other end of the communicating groove 10 is communicated with the oil return path 21, and the pilot oil in the two pilot oil chambers 31 can enter the oil return path 21 through the corresponding communicating groove 10, so that oil return is realized.

As a preferred technical solution of the present embodiment, a pilot oil port 32 is processed on the pilot end cover 3, and pilot oil enters the pilot oil chamber 31 through the pilot oil port 32; the end of the valve core 1 extending into the pilot oil cavity 31 is also sleeved with an elastic part 4 to play a role of buffering, and the valve core 1 is ensured to stably slide in the valve body 2.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (10)

1. A valve core, the valve core (1) slides along a valve body (2) under the action of pilot oil, characterized in that the valve core (1) is a rod-shaped body with variable outer diameter, a communicating groove (10) is formed on the outer peripheral surface of at least one end part of the valve core (1), when the valve core (1) is located in a middle state in the valve body (2), the pilot oil can flow to an oil return oil way (21) in the valve body (2) through the communicating groove (10) to return oil; when the valve core (1) is reversed, pilot oil is blocked and cannot enter the communicating groove (10), or the communicating groove (10) is disconnected from the oil return oil way (21).

2. Valve cartridge according to claim 1, characterized in that the communication groove (10) comprises a helical groove (101), the helical groove (101) extending at least one revolution helically.

3. The valve core according to claim 2, wherein the spiral groove (101) is communicated with an annular groove (102) at the head end and the tail end.

4. A valve cartridge according to any one of claims 1-3, characterized in that the valve cartridge (1) has a plurality of steps arranged at intervals, and the communication groove (10) is arranged on the axially outermost step.

5. Multiple-way valve comprising a valve body (2), characterized in that the valve body (2) is internally fitted with a cartridge according to any one of claims 1 to 4.

6. Multiple-way valve according to claim 5, characterized in that a pilot end cover (3) is connected to the valve body (2) to form a pilot oil chamber (31), and the end of the spool (1) provided with the communicating groove (10) extends into the pilot oil chamber (31).

7. Multiple-way valve according to claim 6, characterized in that an oil return path (21) is arranged in the valve body (2), the oil return path (21) is arranged close to the pilot oil chamber (31), and the axial length of the communication groove (10) is greater than the axial distance between the oil return path (21) and the pilot oil chamber (31).

8. Multiple-way valve according to any one of claims 6 to 7, characterized in that the pilot oil chamber (31) is one, the communicating groove (10) is arranged at one end of the valve core (1), and the adjusting assembly is arranged at the other end of the valve core (1).

9. The multiple-way valve according to any one of claims 6 to 7, characterized in that the number of the pilot oil chambers (31) is two, the communicating groove (10) is arranged at both ends of the valve core (1), and both ends of the valve core (1) respectively extend into the two pilot oil chambers (31).

10. Multiple-way valve according to claim 9, characterized in that the two sets of communication grooves (10) are arranged symmetrically on the valve element (1).

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