CN218760683U - Reversing pressure-limiting valve - Google Patents

Abstract

The utility model relates to the technical field of hydraulic pressure, in particular to a reversing pressure-limiting valve, which comprises a valve body, a main valve core, a pressure-relief oil path and an overflow valve, wherein the valve body is internally provided with a pressure oil path, an oil return path and at least one working oil path; the pressure relief oil way is used for communicating the pressure oil way and the oil return way; the overflow valve is used for controlling the logical section of release oil circuit, and main valve core slide extremely from the meso position the station in-process of pressure oil duct and work oil duct intercommunication, the overflow pressure of overflow valve increases gradually, the utility model discloses a switching-over relief pressure valve low pressure off-load when the meso position increases along with the case displacement, and overflow pressure risees, has guaranteed like this on the one hand that the oil pressure of pressure oil duct can slowly rise, has slowed down pressure oil to valve body or execute component's pressure impact, and on the other hand the oil pressure of pressure oil duct increases gradually, has guaranteed the pressure demand of work oil duct.

Description

Reversing pressure-limiting valve

Technical Field

The utility model relates to the technical field of hydraulics, in particular to switching-over pressure limiting valve.

Background

In the prior art, the initial pressure of the pressure oil passage of the reversing valve is generally provided with two modes: (1) When the pressure oil passage is in the middle position, the pressure oil passage builds pressure and is switched from the middle position to the working position, and the pressure oil after pressure building directly enters a working oil port, for example, the application number is CN201310367187.4, the name is a reversing valve assembly and a patent of a hydraulic system comprising the reversing valve assembly, after the reversing valve reverses from the middle position to the working position, the pressure oil after pressure building directly enters the working oil port, and sudden impact is generated on the working oil port; (2) In the middle position, pressure oil directly returns, for example, the application number is CN201822265830.3, which is named as a patent of a middle position function M-type reversing valve, and in the middle position, the pressure oil is connected with an oil tank, so that the pressure of the oil entering a working oil port after reversing can not reach the pressure requirement quickly.

The above two forms cannot simultaneously take pressure shock and boost after steering into account.

SUMMERY OF THE UTILITY MODEL

In order to solve the current switching-over valve that prior art exists and can not compromise the slow problem that steps up after pressure shock and switching-over simultaneously, the utility model provides a reduce pressure shock and can compromise the switching-over pressure limiting valve that steps up fast after the switching-over.

The utility model provides a technical scheme that its technical problem adopted is:

a reversing pressure limiting valve comprising:

a valve body, a pressure oil passage, an oil return passage and at least one working oil passage are arranged in the valve body,

the main valve core is arranged in the valve body in a sliding mode and controls the on-off of the working oil channel, the pressure oil channel and the oil return channel in a sliding mode;

the pressure relief oil way is used for communicating the pressure oil duct and the oil return passage;

the overflow valve is used for controlling the through section of the pressure relief oil way, and the overflow pressure of the overflow valve is gradually increased when the main valve core slides to the working position where the pressure oil duct is communicated with the working oil duct from the middle position.

Further, the pressure relief oil path comprises a pressure relief oil passage arranged in the main valve core.

Furthermore, a valve sleeve is arranged on the main valve core in a sliding mode, an accommodating cavity is formed in the valve sleeve, a first elastic piece is arranged in the accommodating cavity, one end of the first elastic piece abuts against the valve sleeve, the other end of the first elastic piece abuts against the overflow valve, and when the main valve core slides, the valve sleeve and the main valve core slide relatively, so that the length of the accommodating cavity changes.

The valve further comprises a limiting structure, wherein the limiting structure is used for limiting the movement of the valve sleeve when the main valve core slides so as to enable the valve sleeve and the main valve core to slide relatively.

Furthermore, an end cover is fixed on the valve body, a pilot oil cavity is arranged in the end cover, a second elastic piece is arranged in the pilot oil cavity, one end of the second elastic piece props against the end cover through a first spring seat, and the second end of the second elastic piece props against the main valve core through a second spring seat.

Furthermore, the limiting structure is the first spring seat. First spring holder itself can also carry on spacingly to the valve barrel except playing the effect of spring holder promptly, has further realized the integration of structure.

As an embodiment of the utility model, working oil duct quantity be two, the overflow valve symmetry set up at the main valve core both ends, main valve core slip in-process, the overflow pressure of the overflow valve of one end risees, the overflow pressure of other end overflow valve reduces, wherein the release oil duct that the overflow valve that overflow pressure reduces corresponds is by the shutoff at main valve core slip in-process.

Furthermore, the pressure relief oil ducts and the two overflow valves are arranged in a one-to-one correspondence manner, the two pressure relief oil ducts are independently arranged, inlets respectively communicated with the two pressure relief oil ducts are formed in the side wall of the main valve core, when the main valve core is located at the middle position, the pressure oil ducts are communicated with the two pressure relief oil ducts, and in the sliding process of the main valve core, the pressure relief oil ducts are blocked by the valve body and the corresponding inlets in a superposition manner.

Furthermore, the overflow valve comprises a conical valve core, and the conical valve core is provided with a conical valve head for plugging the pressure relief oil passage.

Furthermore, a sealing ring is arranged between the valve sleeve and the valve body, so that the sealing performance between the valve body and the valve body is ensured, and oil is prevented from passing through a gap between the valve body and the valve body.

Has the advantages that:

(1) The utility model discloses a low pressure off-load of switching-over relief pressure valve when the meso position, along with the main valve core displacement increase, overflow pressure risees, like this, has guaranteed on the one hand that the oil pressure of pressure oil duct can rise gradually in the switching-over process, has slowed down the pressure impact of pressure oil to valve body or executive component, and on the other hand, when being in the meso position, the oil pressure of pressure oil duct is not zero pressure, and the oil pressure increases gradually from a certain setting value (being greater than 0) in the switching-over process promptly, can reach the required oil pressure of pressure oil duct fast, has guaranteed the pressure demand of work oil duct promptly simultaneously;

(2) The reversing pressure reducing valve of the utility model adopts the pressure relief oil duct which is internally arranged in the main valve core, and the pressure relief oil duct does not need to be separately arranged on the valve body, thereby saving space and reducing the volume of the valve body;

(3) The overflow valve of the reversing pressure reducing valve of the utility model is also arranged in the main valve core, and the valve sleeve is limited by the first spring seat, so that the structure is more integrated;

(4) The utility model discloses an in-process of main valve core switching-over is through the accommodation space of the first elastic component of compression to improve the overflow pressure of overflow valve, realize the switching-over and improve the linkage of two actions of overflow pressure, and the realization of two actions only leans on current guide's oil drive to realize, does not need additionally to increase the drive of overflow valve, thereby realizes energy-conserving effect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of the reversing pressure-limiting valve of the present invention;

FIG. 2 is a schematic view of the working principle of the reversing pressure-limiting valve of the present invention in the neutral position;

FIG. 3 is a schematic view of the working principle of the reversing process of the reversing pressure-limiting valve of the present invention;

FIG. 4 is a schematic view of the working principle of the reversing pressure-limiting valve of the present invention;

FIG. 5 is a hydraulic schematic diagram of the reversing pressure-limiting valve of the present invention;

fig. 6 is a pressure graph.

The hydraulic control valve comprises a valve body 1, a valve body 2, a pressure oil channel 3, an oil return channel 4, a working oil channel 5, a main valve core 51, a pressure relief oil channel 6, a valve sleeve 7, a first elastic part 8, an end cover 9, a second elastic part 10, a first spring seat 11, a second spring seat 12, a cone valve core 13 and a sealing ring.

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 of the present invention, all other embodiments obtained by a person skilled in the art without making 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 exemplary 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 parts and steps, 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 one 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.

For ease of description, spatially relative terms such as "over … …", "over … …", "over … …", "over", etc. may be used herein to describe the spatial positional relationship of one device or feature to another device or feature as shown 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 … …" may include both orientations 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.

Referring to fig. 1 to 5, a reversing pressure-limiting valve comprises a valve body 1, a main valve core 5, a pressure-relief oil path and an overflow valve, wherein a pressure oil path 2, an oil return path 3 and at least one working oil path 4 are arranged in the valve body 1, the main valve core 5 is slidably arranged in the valve body 1, and the main valve core 5 slidably controls the on-off of the working oil path 4, the pressure oil path 2 and the oil return path; the pressure relief oil way is used for communicating the pressure oil duct 2 and the oil return duct 3; the overflow valve is used for controlling the through section of the pressure relief oil way, and the overflow pressure of the overflow valve is gradually increased in the process that the main valve core 5 slides from the middle position to the working position where the pressure oil channel 2 is communicated with the working oil channel 4.

The pressure relief oil path and the relief valve can adopt but are not limited to the following embodiments:

example 1: the pressure relief oil path is a pipeline which is independently arranged outside the valve body 1, the pressure relief oil path and the overflow valve are both arranged outside the valve body 1, and the pressure relief oil path and the overflow valve are used for adapting to the reversing of the main valve core 5 by actively adjusting the overflow pressure of the overflow valve.

Example 2: the pressure relief oil path and the overflow valve are arranged in the valve body 1, a channel is arranged in the valve body 1 to serve as the pressure relief oil path, the overflow valve is also arranged in the valve body 1, and the overflow pressure can be controlled independently as in embodiment 1.

Example 3:

as the utility model discloses a preferred embodiment, the release oil circuit is including setting up the release oil duct 51 in main valve core 5, the overflow valve also sets up in main valve core 5, it is concrete, it is equipped with valve barrel 6 to slide on main valve core 5, be equipped with in the valve barrel 6 and hold the chamber, it is equipped with first elastic component 7 to hold the intracavity, 7 one end of first elastic component are supported on valve barrel 6, the other end supports on the overflow valve, when main valve core 5 slides, valve barrel 6 produces relative slip with main valve core 5, thereby compress the accommodation space of first elastic component 7, make the opening pressure (overflow pressure) of overflow valve produce the change.

Valve barrel 6 can take the initiative and main valve core 5 produces relative motion, the utility model discloses in, valve barrel 6 adopts passive form and main valve core 5 to produce relative slip, and is concrete, the utility model discloses a switching-over limit valve still includes limit structure, thereby limit valve barrel 6 motion makes valve barrel 6 and main valve core 5 produce relative slip when main valve core 5 slides. The limiting structure can be independently arranged and can also be integrated to parts in the valve body 1. Other parts on the valve body 1 are: an end cover 8 is fixed on the valve body 1, a pilot oil cavity is arranged in the end cover 8, a second elastic part 9 is arranged in the pilot oil cavity, one end of the second elastic part 9 abuts against the end cover 8 through a first spring seat 10, and the second end of the second elastic part 9 abuts against the main valve core 5 through a second spring seat 11. The utility model discloses in, limit structure is integrated for first spring holder 10, and first spring holder 10 itself can also carry on spacingly to valve barrel 6 except the effect that plays the spring holder promptly. The first elastic member 7 may be selected but not limited to a first spring, and the second elastic member 9 may be selected but not limited to a second spring.

The number of the working oil passages 4 is two, the overflow valves are symmetrically arranged at two ends of the main valve core 5, the overflow pressure of the overflow valve at one end is increased and the overflow pressure of the overflow valve at the other end is reduced in the sliding process of the main valve core 5, wherein the pressure relief oil passage 51 corresponding to the overflow valve with the reduced overflow pressure is blocked in the sliding process of the main valve core 5.

The pressure relief oil passages 51 are arranged in one-to-one correspondence with the two overflow valves, the two pressure relief oil passages 51 are independently arranged, inlets which are respectively communicated with the two pressure relief oil passages 51 are formed in the side wall of the main valve core 5, when the main valve core 5 is located in the middle position, the pressure oil passages 2 are communicated with the two pressure relief oil passages 51, and in the sliding process of the main valve core 5, the pressure relief oil passages 51 are blocked by the valve body 1 and the corresponding inlets in a superposition mode.

The relief valve includes a cone spool 12, and the cone spool 12 has a cone head for blocking the pressure relief oil passage 51. And a sealing ring 13 is arranged between the valve sleeve 6 and the valve body 1, so that the sealing effect is ensured.

Outlets of the two working oil passages 4 are respectively an A port and a B port, correspondingly, pilot oil cavities are symmetrically arranged on two sides, inlets of the pilot oil cavities on the two sides are respectively a pa port and a pb port, an inlet of the pressure oil passage 2 is a P port, and an outlet of the oil return passage 3 is a T port.

The working principle is as follows:

as shown in fig. 2, when the main valve element is in the neutral position, pressure oil at port P enters the pressure relief oil passage 51 inside the main valve element 5, so that the cone valve element 12 is opened, and the port P is unloaded at low pressure.

Referring to fig. 3, taking the case that main valve element 5 is reversed to the right, in the reversing process, pa applies pilot pressure, main valve element 5 starts to reverse, P port oil acts on right side cone valve element 12 through pressure relief oil passage 51 on the right side in main valve element 5, and due to the reversing of main valve element 5, the first spring on the right side is compressed, and the unloading pressure is increased.

Referring to fig. 4, taking the case that main valve element 5 reverses to the right, when the reversing is finished, pa pressure continues to increase, main valve element 5 pushes against valve sleeve 6, main valve element 5 reverses to the maximum stroke, the first spring compression on the right side is the maximum, the opening pressure reaches the maximum, and port P needs higher pressure to release pressure.

The left reversing operation principle of main valve element 5 is similar to the right reversing operation of main valve element 5, and the description is omitted here.

Fig. 6 is a pressure curve diagram, the utility model discloses a switching-over relief pressure valve low pressure off-load when the meso position, increase along with 5 displacements of main valve core, overflow pressure risees, thus, the oil pressure of having guaranteed the pressure oil duct on the one hand can rise gradually at the switching-over in-process, the pressure impact of pressure oil to valve body or execute component has been slowed down, on the other hand, when being in the meso position, the oil pressure of pressure oil duct is not zero pressure, the oil pressure increases gradually from certain setting value (being greater than 0) at the switching-over in-process promptly, can reach the required oil pressure of pressure oil duct fast, the pressure demand of working oil duct has been guaranteed simultaneously promptly.

Above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the design of the present invention, equivalent replacement or change should be covered within the protection scope of the present invention.

Claims (10)

1. A reversing pressure-limiting valve is characterized by comprising:

the valve body (1), a pressure oil duct (2), an oil return duct (3) and at least one working oil duct (4) are arranged in the valve body (1),

the main valve core (5) is arranged in the valve body (1) in a sliding manner, and the main valve core (5) controls the on-off of the working oil duct (4), the pressure oil duct (2) and the oil return oil duct in a sliding manner;

the pressure relief oil way is used for communicating the pressure oil duct (2) and the oil return channel (3);

the overflow valve is used for controlling the through section of the pressure relief oil way, and the overflow pressure of the overflow valve is gradually increased in the process that the main valve core (5) slides from the middle position to the working position where the pressure oil duct (2) is communicated with the working oil duct (4).

2. A reversing pressure limiting valve according to claim 1, wherein: the pressure relief oil path comprises a pressure relief oil passage (51) arranged in the main valve core (5).

3. A reversing pressure limiting valve according to claim 2, wherein: main valve core (5) on slide and be equipped with valve barrel (6), valve barrel (6) in be equipped with and hold the chamber, the chamber of holding be equipped with first elastic component (7), first elastic component (7) one end support on valve barrel (6), the other end supports on the overflow valve, main valve core (5) when sliding, valve barrel (6) and main valve core (5) produce relative slip.

4. A reversing pressure limiting valve according to claim 3, wherein: the valve further comprises a limiting structure, and the limiting structure is used for limiting the movement of the valve sleeve (6) when the main valve core (5) slides so as to enable the valve sleeve (6) and the main valve core (5) to slide relatively.

5. A reversing pressure limiting valve according to claim 4, characterized in that: the valve body (1) on be fixed with end cover (8), end cover (8) in be equipped with the pilot oil chamber, the pilot oil chamber in be equipped with second elastic component (9), the one end of second elastic component (9) support through first spring holder (10) end cover (8), the second end of second elastic component (9) support through second spring holder (11) main valve core (5).

6. A reversing pressure limiting valve according to claim 5, wherein: the limiting structure is the first spring seat (10).

7. A reversing pressure-limiting valve according to any one of claims 2 to 6, characterized in that: the number of the working oil passages (4) is two, the overflow valves are symmetrically arranged at two ends of the main valve core (5), the overflow pressure of the overflow valve at one end is increased and the overflow pressure of the overflow valve at the other end is reduced in the sliding process of the main valve core (5), and the pressure relief oil passages (51) corresponding to the overflow valves with the reduced overflow pressure are blocked in the sliding process of the main valve core (5).

8. A reversing pressure limiting valve according to claim 7, wherein: the pressure relief oil passages (51) are arranged in one-to-one correspondence with the two overflow valves, the two pressure relief oil passages (51) are independently arranged, inlets which are respectively communicated with the two pressure relief oil passages (51) are formed in the side wall of the main valve core (5), when the main valve core (5) is located at the middle position, the pressure oil passages (2) are communicated with the two pressure relief oil passages (51), and in the sliding process of the main valve core (5), the pressure relief oil passages (51) are blocked by the valve body (1) and the corresponding inlets in a superposition mode.

9. A reversing pressure limiting valve according to claim 2, wherein: the overflow valve comprises a cone valve core (12), wherein the cone valve core (12) is provided with a cone valve head for blocking the pressure relief oil passage (51).

10. A reversing pressure limiting valve according to claim 3, characterized in that: and a sealing ring (13) is arranged between the valve sleeve (6) and the valve body (1).

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