CN220850900U - Throttle valve and engineering machinery - Google Patents

Abstract

The utility model relates to the technical field of throttle valves, and discloses a throttle valve and engineering machinery, wherein the throttle valve comprises a valve body, a valve core, an adjusting piece and an elastic piece, a valve cavity is arranged in the valve body, and a first flow port and a second flow port are respectively arranged at two ends of the valve cavity; the valve core is movably arranged in the valve cavity and forms a throttle orifice with the cavity wall of the valve cavity; the valve core is provided with a first channel which is communicated with the throttle orifice and the first flow port; the adjusting piece is movably arranged at the second flow port, one end of the adjusting piece is matched with the valve core, and the adjusting piece is suitable for driving the valve core to move and changing the flow area of the throttling port; the adjusting piece is provided with a second channel which is communicated with the throttling mouth and the second flow port; one end of the elastic piece is connected with the valve cavity, and the other end of the elastic piece is connected with the valve core and is suitable for providing elastic acting force for the valve core towards the direction of the second flow port. According to the throttle valve provided by the utility model, the flow area of the throttle orifice can be changed as required, so that the flow regulation of the throttle valve is realized.

Description

Throttle valve and engineering machinery

Technical Field

The utility model relates to the technical field of throttle valves, in particular to a throttle valve and engineering machinery.

Background

Because of the popularization of the electric control valve, the operability of engineering machinery such as a digging machine is obviously improved. In contrast, when the working machine such as the excavator is started by walking, the starting impact can be reduced through the main pump adjustment, but when the walking is stopped rapidly, the stopping impact cannot be reduced through the electric control valve, so the impact is generally reduced by adding the one-way throttle valve to the walking guide. However, the throttle valve in the related art has fixed throttle ports and is easy to be blocked by clamping.

Disclosure of utility model

In view of the above, the present utility model provides a throttle valve and an engineering machine to solve the problem that the throttle valve is easy to be blocked.

In a first aspect, the utility model provides a throttle valve, which comprises a valve body, a valve core, an adjusting piece and an elastic piece, wherein a valve cavity is arranged in the valve body, and a first flow port and a second flow port are respectively arranged at two ends of the valve cavity; the valve core is movably arranged in the valve cavity and forms a throttle orifice with the cavity wall of the valve cavity; the valve core is provided with a first channel which is communicated with the throttling port and the first flow port; the adjusting piece is movably arranged at the second flow port, one end of the adjusting piece is matched with the valve core and is suitable for driving the valve core to move and changing the flow passage area of the throttling port; the adjusting piece is provided with a second channel which is communicated with the throttling port and the second flow port; one end of the elastic piece is connected with the valve cavity, and the other end of the elastic piece is connected with the valve core and is suitable for providing elastic acting force for the valve core towards the direction of the second circulation port.

The beneficial effects are that: the adjusting piece is movably arranged at the second flow port and can move in the valve cavity and be fixed at the corresponding position at the second flow port after moving by a corresponding distance so as to fix the valve core. Through the setting of adjusting part, can make the case remove in the valve pocket under the drive of adjusting part, the in-process that removes, the excessive flow area of the orifice that forms between case and the valve pocket follows the change to realize the flow regulation of choke valve. And when risks such as jamming and blockage occur to the throttle valve, the adjusting piece can drive the valve core to move and increase the flow passage area of the throttle orifice so as to eliminate risks such as jamming and blockage. Furthermore, the first flow port and the second flow port are respectively arranged at two ends of the valve cavity, so that the distance between the first flow port and the second flow port can be pulled apart, and the first flow port and the second flow port are convenient to be connected with different structures. When fluid enters from the first flow port, the valve core is fixed at the fixed lower position of the regulating piece, and the fluid sequentially passes through the first channel, the throttling port, the second channel and the second flow port, so that throttling is generated at the throttling port. When fluid enters from the second flow port, the fluid pushes the valve core to move after passing through the second channel, the valve core overcomes the elastic acting force of the elastic piece and moves towards the first flow port, the flow area of the throttle port is increased, and the fluid sequentially and smoothly passes through the throttle port, the first channel and the first flow port; since the elastic member provides the valve core with an elastic force in the direction of the second flow port, after the fluid stops flowing, the elastic member drives the valve core to move in the direction of the second flow port through the elastic force so as to restore the valve core to the initial position.

In an alternative embodiment, a conical surface is arranged on the cavity wall of the valve cavity, a matching part is formed at the edge of the valve core facing the second circulation port, and the throttling port is formed between the conical surface and the matching part.

The beneficial effects are that: because the overflow area of the conical surface is gradually changed along the axial direction of the conical surface, when the valve core moves and is positioned at different positions, the gap between the conical surface and the matching part can be changed, and therefore the throttling area of the formed throttling port can be correspondingly changed, and the throttling effect is achieved.

In an alternative embodiment, the throttle valve further comprises a throttle groove, wherein the throttle groove is arranged on the conical surface and is communicated with the first channel and the second channel.

The beneficial effects are that: the arrangement of the throttling groove can not only increase the overflow area of the throttling opening, but also ensure the communication between the first channel and the second channel when the matching part is abutted with the conical surface and the throttling opening is closed, and the basic throttling effect is maintained.

In an alternative embodiment, the groove depth of the throttling groove increases gradually in a direction towards the second flow opening.

The beneficial effects are that: the throttling groove is formed in the cavity wall of the valve cavity, when the cavity wall of the valve cavity is worn and damaged, the groove depth gradually increases along the direction towards the second flow port, so that the throttling groove can be subjected to wear compensation, the existence of the throttling groove is ensured, and the integral throttling effect of the throttling port and the throttling groove is ensured through the adjusting piece.

In an alternative embodiment, a first cylindrical surface is further arranged on the cavity wall of the valve cavity, and the conical surface is arranged between the first cylindrical surface and the second flow port; the valve core comprises a first core body part and a second core body part which are arranged in a step shape, the first core body part is in sliding fit with a first cylindrical surface, the second core body part is arranged at intervals with the first cylindrical surface, and the matching part is arranged on the second core body part.

The beneficial effects are that: the first core body part is in sliding fit with the first cylindrical surface, so that the sliding effect of the valve core in the valve cavity is ensured, and the valve core is prevented from overturning or shifting in the valve cavity; the second core body part and the first cylindrical surface are arranged at intervals, so that a hydraulic oil flow channel is formed between the second core body part and the valve cavity, and smooth communication between the first channel and the throttling port is kept.

In an alternative embodiment, the first channel includes a communication hole and a first through hole, the communication hole penetrates through an end surface of the first core portion, which is far away from the second core portion, and the first through hole is disposed at an outer periphery of the second core portion.

The beneficial effects are that: the circulation hole penetrates through the end face of the first core body part far away from the second core body part, so that the fluid entering at the first circulation hole can be ensured to smoothly pass through, and the fluid entering at the second circulation hole can push the valve core to move towards the first circulation hole; the first through hole is arranged on the periphery of the second core body part, smooth communication between the first channel and the valve cavity can be always kept, and the first channel can be smoothly communicated with the throttling port and the first flow port.

In an alternative embodiment, a second cylindrical surface is further arranged on the cavity wall of the valve cavity and is arranged between the conical surface and the second flow port, and the inner diameter of the second cylindrical surface is smaller than that of the first cylindrical surface; the regulating piece comprises a push rod and a positioning head which are arranged in a step shape, the push rod is arranged in the second column surface in a penetrating mode, one end, away from the positioning head, of the push rod is suitable for being abutted to the valve core, and the positioning head is connected with the side wall of the second flow port through threads.

The beneficial effects are that: the positioning head is connected with the side wall of the second flow port through threads, can be fixed at any position in the axial direction of the second flow port, can rotate to move in the axial direction of the second flow port, and drives the valve core to move through the ejector rod to change the flow area of the throttle port.

In an alternative embodiment, the second channel includes a second through hole and a flow groove that are communicated with each other, the second through hole penetrates through the ejector rod and the end face of the positioning head, and the flow groove is disposed on the ejector rod and is communicated with the choke.

The beneficial effects are that: one end of the ejector rod is suitable for being abutted with the valve core, can extend into the throttle opening from the second column surface and is arranged at intervals with the conical surface, so that the circulation effect of the circulation groove and the throttle opening is ensured, and the circulation effect of the second channel is further ensured.

In an alternative embodiment, the end face of the positioning head facing away from the carrier rod is provided with a first cross groove.

The beneficial effects are that: the setting of first cross groove can be convenient for assemble, dismantle and the position adjustment with the help of the instrument to the regulating part for even set up in the valve pocket is inside, its assembly, dismantlement and the regulation of position also become simple and convenient.

In an alternative embodiment, the device further comprises a limiting seat connected to the first flow port, and a third channel is arranged on the limiting seat and is communicated with the first flow port and the first channel; the elastic piece is arranged between the valve core and the limiting seat.

The beneficial effects are that: the position of the elastic piece can be limited and fixed by the limiting seat, when the regulating piece moves in the direction away from the first flow port, the valve core can move and reset along with the regulating piece in the direction away from the first flow port under the action of elastic force of the elastic piece, and the overflow area of the throttling port is changed.

In an alternative embodiment, the limiting seat is in threaded connection with the first flow port, and the third channel is a third through hole penetrating through the limiting seat.

The beneficial effects are that: the limiting seat is in threaded connection with the first flow port, is simple in structure and stable in connection, and can be fixed at different positions of the first flow port according to requirements so as to adjust the compression degree of the elastic piece; the third through hole may ensure communication between the first flow port and the first channel.

In an alternative embodiment, a second groove is formed in one end of the limiting seat, which faces away from the elastic piece.

The beneficial effects are that: the setting of second cross groove can be convenient for the assembly, dismantlement and the position adjustment of spacing seat for even set up in the valve pocket is inside, its assembly, dismantlement and the regulation of position also become simple and convenient.

In an optional embodiment, the limiting seat comprises a seat body and a convex column, the seat body is connected with the first flow port, and the elastic piece is a spring and sleeved on the periphery of the convex column.

The beneficial effects are that: the pedestal is used for being connected with first flow opening, and the spring housing is established outside the projection to the step face butt that pedestal and projection formed is passed through to one end of spring.

In an alternative embodiment, the outer periphery of the valve body is provided with an outer hexagon; the periphery of one end of the valve body is provided with a first thread which is suitable for being connected with a connecting pipeline of the traveling motor; and/or the periphery of the other end of the valve body is provided with a second thread, and the second thread is suitable for being connected with a lead-out port of the foot valve.

The beneficial effects are that: the arrangement of the outer hexagon is convenient for utilizing auxiliary tools such as a spanner and the like to carry out threaded connection on the valve body and a connecting pipeline of the walking motor and/or an outlet of the foot valve.

In an alternative embodiment, a limit groove is arranged on the periphery of the valve body, the limit groove is arranged near one end provided with the second flow port, and a sealing ring is arranged in the limit groove.

The beneficial effects are that: the limiting groove can be used for limiting and installing a sealing ring, and the sealing ring can be used for realizing sealing connection between the valve body and the lead-out opening of the foot valve.

In an alternative embodiment, the first flow port and the second flow port are coaxially arranged.

The beneficial effects are that: the first flow port and the second flow port are coaxially arranged at two ends of the valve cavity, the throttle valve can be integrated on the end straight-through joint, the structure is compact, the assembly is convenient, and the throttle valve can be directly replaced with the common end straight-through joint.

In a second aspect, the utility model also provides engineering machinery comprising the throttle valve.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view from two perspectives of a throttle valve (spool in a first adjustment position) according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view from two perspectives of a throttle valve (spool in a second adjustment position) according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a throttle valve according to an embodiment of the present utility model from various viewing angles;

FIG. 4 is a cross-sectional view of a valve body according to an embodiment of the present utility model from two perspectives;

FIG. 5 is a schematic view of a valve cartridge according to an embodiment of the present utility model from two different perspectives;

FIG. 6 is a cross-sectional view of a spool according to an embodiment of the present utility model from two perspectives;

FIG. 7 is a schematic view of an adjusting member according to an embodiment of the present utility model from various viewing angles;

FIG. 8 is a cross-sectional view of an adjustment member according to an embodiment of the present utility model;

FIG. 9 is a schematic diagram of two views of a limiting seat according to an embodiment of the present utility model;

FIG. 10 is an application assembly view of a throttle valve of an embodiment of the present utility model from two perspectives;

Fig. 11 is a hydraulic schematic of a throttle valve according to an embodiment of the present utility model.

Reference numerals illustrate:

1. A valve body; 10. a valve cavity; 11. a first flow port; 12. a second flow port; 13. a conical surface; 131. a throttling groove; 14. a first cylindrical surface; 15. a second column surface; 16. an outer hexagon; 17. a first thread; 18. a second thread; 19. a limit groove;

2. A valve core; 21. a first channel; 211. a flow hole; 212. a first through hole; 22. a mating portion; 23. a first core portion; 24. a second core portion;

3. A choke;

4. an adjusting member; 41. a second channel; 411. a second through hole; 412. a flow channel; 42. a push rod; 43. a positioning head; 431. a first cross groove;

5. an elastic member; 6. a limit seat; 61. a third channel; 62. a second slot; 63. a base; 64. a convex column;

7. a connecting pipeline; 8. foot valve; 9. a seal ring;

100. An oil-guiding way; 200. a working oil path; 300. a throttle valve; 400. and a control valve.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

An embodiment of the present utility model is described below with reference to fig. 1 to 11. A in fig. 1 is a front cross-sectional view of the spool 2 of the throttle valve 300 in a first adjustment position; b in fig. 1 is a partially cut-away perspective view of the valve element 2 of the throttle valve 300 in the first adjustment position. A in fig. 2 is a front cross-sectional view of the spool 2 of the throttle valve 300 in the second adjustment position; b in fig. 2 is a partially cut-away perspective view of the valve element 2 of the throttle valve 300 in the second adjustment position. A in fig. 3 is a front view of the throttle valve 300; b in fig. 3 is a bottom view of a in fig. 3; c in fig. 3 is a first perspective view of the throttle valve 300;

d in fig. 3 is a second perspective view of the throttle valve 300. A in fig. 4 is a partially cut-away perspective view of the valve body 1; b in fig. 4 is a front cross-sectional view of the valve body 1. A in fig. 5 is a front view of the valve element 2;

B in fig. 5 is a top view of the valve element 2. A in fig. 6 is a partially cut-away perspective view of the valve element 2; b in fig. 6 is a front cross-sectional view of the valve element 2. A in fig. 7 is a front view of the adjusting member 4; b in fig. 7 is a perspective view of the adjusting member 4; c in fig. 7 is a top view of the adjusting member 4; d in fig. 7 is a bottom view of the adjusting member 4. Fig. 8 is a front cross-sectional view of the adjusting member 4. A in fig. 9 is a front view of the limit seat 6;

B in fig. 9 is a top view of the seat 6. A in fig. 10 is an application assembly top view of the throttle valve 300;

B in fig. 10 is an application assembly perspective view of the throttle valve 300. Fig. 11 is a schematic diagram of the applied hydraulic pressure of the throttle valve 300.

According to an embodiment of the present utility model, in one aspect, as shown in fig. 1 to 3, there is provided a throttle valve 300 including a valve body 1, a valve core 2, an adjusting member 4, and an elastic member 5, wherein a valve cavity 10 is provided inside the valve body 1, and both ends of the valve cavity 10 are provided with a first flow port 11 and a second flow port 12, respectively; the valve core 2 is movably arranged in the valve cavity 10 and forms a throttle opening 3 with the cavity wall of the valve cavity 10; the valve core 2 is provided with a first channel 21, and the first channel 21 is communicated with the throttling port 3 and the first circulation port 11; the adjusting piece 4 is movably arranged at the second flow port 12, one end of the adjusting piece is matched with the valve core 2, and the adjusting piece is suitable for driving the valve core 2 to move and changing the flow area of the throttle port 3; the adjusting piece 4 is provided with a second channel 41, and the second channel 41 is communicated with the throttling port 3 and the second circulation port 12; one end of the elastic member 5 is connected to the valve chamber 10, and the other end is connected to the valve element 2, and is adapted to provide an elastic force to the valve element 2 in a direction toward the second flow port 12.

Through setting up of regulating part 4, can make case 2 remove in valve pocket 10 under the drive of regulating part 4, the in-process that removes, the excessive flow area of the orifice 3 that forms between case 2 and the valve pocket 10 follows the change to realize the flow regulation of choke 300, and, regulating part 4 can drive case 2 and remove and increase the excessive flow area of orifice 3 in order to eliminate risks such as jamming and jam when the risk such as choke 300 takes place to block up. Furthermore, the first flow port 11 and the second flow port 12 are respectively disposed at two ends of the valve cavity 10, so that the distance between the first flow port 11 and the second flow port 12 can be pulled apart, and the first flow port 11 and the second flow port 12 can be connected with different structures, and compared with the related art in which the first flow port 11 and the second flow port 12 are close to each other, two ends of the throttle valve 300 in this embodiment can be directly connected as a connection joint, and no other pipeline or joint is required to be led out for connection. The adjusting member 4 is movably disposed at the second flow port 12, and can be moved in the valve chamber 10, and can be fixed at a corresponding position at the second flow port 12 after being moved by a corresponding distance, so as to fix the valve core 2.

When fluid enters from the first flow port 11, the valve core 2 is fixed at the fixed lower position of the regulator 4, and the fluid sequentially passes through the first passage 21, the orifice 3, the second passage 41 and the second flow port 12, so that the orifice 3 is throttled. When fluid enters from the second flow port 12, the fluid pushes the valve core 2 to move after passing through the second channel 41, the valve core 2 overcomes the elastic acting force of the elastic piece 5 and moves towards the first flow port 11, the flow area of the throttle port 3 is increased, and the fluid sequentially and smoothly passes through the throttle port 3, the first channel 21 and the first flow port 11; since the elastic member 5 provides the valve body 2 with an elastic force in a direction toward the second flow port 12, the elastic member 5 drives the valve body 2 to move toward the second flow port 12 by the elastic force after the fluid stops flowing, so as to restore the valve body 2 to the original position.

In one embodiment, as shown in FIG. 4, the first flow port 11 and the second flow port 12 are coaxially disposed.

The first flow port 11 and the second flow port 12 are coaxially arranged at two ends of the valve cavity 10, so that the throttle valve 300 can be integrated on an end straight-through joint, the structure is compact, the assembly is convenient, and the throttle valve can be directly replaced with a common end straight-through joint.

As an alternative embodiment, the throttle valve 300 may be integrated in a elbow, with an angle between the axis of the first flow opening 11 and the axis of the second flow opening 12.

In one embodiment, as shown in fig. 1 and 2, a conical surface 13 is provided on the cavity wall of the valve cavity 10, the edge of the valve core 2 facing the second flow port 12 forms a matching portion 22, and a choke 3 is formed between the conical surface 13 and the matching portion 22.

As shown in fig. 1 and 2, since the flow area of the tapered surface 13 gradually changes along the axial direction of the tapered surface 13, when the valve element 2 moves and is located at a different position, the gap between the tapered surface 13 and the mating portion 22 will change, and thus the throttle area of the formed throttle orifice 3 will also change accordingly, so as to achieve the effect of variable throttle.

Specifically, in the directions shown in fig. 1 and 2, the valve element 2 moves upward, the gap becomes small, the throttle area becomes small, the valve element 2 moves downward, the gap becomes large, and the throttle area becomes large.

In one embodiment, the throttle valve 300 further includes a throttle groove 131, and the throttle groove 131 is formed on the conical surface 13 and communicates with the first channel 21 and the second channel 41. Wherein the throttle groove 131 extends along the axial direction of the valve element 2, and both ends of the throttle groove 131 extend to both end positions of the tapered surface 13.

The arrangement of the throttling groove 131 can not only increase the flow passage area at the throttling mouth 3, but also ensure the communication between the first channel 21 and the second channel 41 when the matching part 22 is abutted with the conical surface 13 and the throttling mouth 3 is closed, so as to maintain the basic throttling effect.

Specifically, the engaging portion 22 may be a chamfer formed on the edge of the valve element 2 facing the second flow port 12, a rounded corner formed on the edge of the valve element 2 facing the second flow port 12, or a corner formed on the edge of the valve element 2 facing the second flow port 12. The shape of the mating portion 22 is not limited in any way, as long as the choke 3 can be formed between the tapered surface 13 and the mating portion 22. The conical surface 13 may be an arc surface, a straight surface, or a combination of an arc surface and a straight surface. The flow-restricting groove 131 may be provided in one or more. In the present embodiment, the plurality of the throttling grooves 131 are provided, and the plurality of the throttling grooves 131 are uniformly spaced apart in the circumferential direction of the tapered surface 13.

In one embodiment, as shown in FIG. 6, the mating portion 22 is rounded. The rounded corners have no sharp corners, and the conical surface 13 is not easy to scratch or damage when matched with the conical surface 13.

In one embodiment, as shown in fig. 1, 2 and 4, the groove depth of the throttling groove 131 gradually increases in a direction toward the second flow passage 12.

Specifically, the throttling groove 131 is formed on the conical surface 13, and when the conical surface 13 is worn and damaged, the groove depth gradually increases along the direction towards the second flow opening 12, so that the throttling groove 131 can be subjected to wear compensation, the existence of the throttling groove 131 is ensured, and the overall throttling effect of the throttling opening 3 and the throttling groove 131 can be ensured through the adjusting piece 4.

In one embodiment, as shown in fig. 1 to 2 and fig. 4 to 6, a first cylindrical surface 14 is further provided on the cavity wall of the valve cavity 10, and a conical surface 13 is provided between the first cylindrical surface 14 and the second flow port 12; the valve core 2 comprises a first core body 23 and a second core body 24 which are arranged in a stepped mode, the first core body 23 is in sliding fit with the first cylindrical surface 14, the second core body 24 is arranged at intervals with the first cylindrical surface 14, and the matching part 22 is arranged on the second core body 24.

Specifically, the first core portion 23 and the second core portion 24 are coaxially disposed, and the outer diameter of the first core portion 23 is larger than the outer diameter of the second core portion 24, the first core portion 23 extends toward the first flow port 11, and the second core portion 24 extends toward the second flow port 12.

In one embodiment, as shown in fig. 1 to 2 and fig. 4 to 6, the first passage 21 includes a communication hole 211 and a first through hole 212 that communicate with each other, the communication hole 211 penetrates an end surface of the first core portion 23 that is away from the second core portion 24, and the first through hole 212 is provided at an outer periphery of the second core portion 24.

The first core body 23 is in sliding fit with the first cylindrical surface 14, so that the sliding effect of the valve core 2 in the valve cavity 10 is ensured, and the valve core 2 is prevented from overturning or shifting in the valve cavity 10; the second core 24 is spaced from the first cylindrical surface 14, so that a hydraulic oil flow passage is formed between the second core 24 and the valve chamber 10, and smooth communication between the first passage 21 and the orifice 3 is maintained. The flow hole 211 penetrates through the end surface of the first core body 23, which is far away from the second core body 24, so that the fluid entering at the first flow port 11 can smoothly pass through, and the fluid entering at the second flow port 12 can push the valve core 2 to move towards the first flow port 11; the first through hole 212 is provided on the outer periphery of the second core portion 24, and smooth communication between the first passage 21 and the valve chamber 10 can be always maintained, so that the first passage 21 can smoothly communicate the choke 3 and the first flow opening 11.

Specifically, the orifice of the flow hole 211 is provided on the end surface of the first core portion 23 remote from the second core portion 24, that is, the orifice faces the first flow opening 11, and the flow hole 211 is a blind hole.

In one embodiment, as shown in fig. 1 to 2 and fig. 7 to 8, a second cylindrical surface 15 is further provided on the cavity wall of the valve cavity 10 and is disposed between the conical surface 13 and the second flow port 12, and the inner diameter of the second cylindrical surface 15 is smaller than that of the first cylindrical surface 14, so that the conical surface 13 is radially reduced in the direction from the first cylindrical surface 14 to the second cylindrical surface 15; the adjusting piece 4 comprises a push rod 42 and a positioning head 43 which are arranged in a step shape, the push rod 42 is arranged in the second column surface 15 in a penetrating mode, one end, away from the positioning head 43, of the push rod 42 is suitable for being abutted with the valve core 2, and the positioning head 43 is connected with the side wall of the second flow port 12 through threads. The second passage 41 includes a second through hole 411 and a flow groove 412 which communicate with each other, the second through hole 411 penetrating the end surfaces of the jack 42 and the positioning head 43, the flow groove 412 being provided on the jack 42 and communicating with the choke 3.

The positioning head 43 is connected with the side wall of the second flow port 12 through threads, and can be fixed at any position in the axial direction of the second flow port 12, can also rotate to move in the axial direction of the second flow port 12, and drives the valve core 2 to move through the ejector rod 42 to change the flow passage area of the throttle port 3. One end of the ejector rod 42 is abutted with the valve core 2, can extend into the throttle orifice 3, and is arranged at intervals with the conical surface 13, so that the circulation effect of the circulation groove 412 is ensured.

When fluid enters from the second flow port 12, the fluid directly acts on the second core portion 24 through the second channel 41, the valve core 2 is pushed to move away from the second flow port 12, the ejector rod 42 is separated from the valve core 2, the flow area of the throttle port 3 is increased, and the fluid sequentially and smoothly passes through the second flow port 12, the second channel 41, the throttle port 3, the first channel 21 and the first flow port 11.

Specifically, the ejector rod 42 is in sliding fit with the second column surface 15, so that the sliding effect of the adjusting piece 4 in the valve cavity 10 can be ensured, the adjusting piece 4 is prevented from overturning or shifting in the valve cavity 10, and fluid can be prevented from overflowing between the ejector rod 42 and the second column surface 15. One end of the ejector rod 42 is suitable for being abutted with the valve core 2, and can extend into the choke 3 from the second column surface 15 and be arranged at intervals with the conical surface 13, so that the circulation effect of the circulation groove 412 and the choke 3 is ensured, and the circulation effect of the second channel 41 is further ensured. The second column surface 15 may form a limiting step with the second flow port 12, and the positioning head 43 may perform limiting in the axial direction through the limiting step.

In one embodiment, as shown in FIG. 7, the positioning head 43 is threadably coupled to the second flow port 12. The end face of the positioning head 43 facing away from the ejector rod 42 is provided with a first cross groove 431.

The positioning head 43 is in threaded connection with the second flow port 12, is simple in structure and stable in connection, and can be fixed at different positions of the second flow port 12 according to requirements so as to fix the valve core 2 at different positions in the valve cavity 10, so that the throttle port 3 can have different flow areas. The provision of the first cross groove 431 facilitates the assembly, disassembly and position adjustment of the adjusting member 4 by means of a tool, so that the assembly, disassembly and position adjustment of the positioning head 43 becomes simple and convenient even if it is provided inside the valve chamber 10.

In one embodiment, as shown in fig. 1, 2 and 9, the device further comprises a limiting seat 6; the limiting seat 6 is connected to the first flow port 11, a third channel 61 is arranged on the limiting seat 6, and the third channel 61 is communicated with the first flow port 11 and the first channel 21; the elastic piece 5 is arranged between the valve core 2 and the limiting seat 6.

The position of the elastic member 5 can be limited and fixed by the limiting seat 6, and when the adjusting member 4 moves in a direction away from the first flow opening 11 (i.e. above shown in fig. 1 and 2), the valve core 2 can move and reset along with the adjusting member 4 in a direction away from the first flow opening 11 under the action of elastic force of the elastic member 5, and the flow area of the throttle opening 3 is changed.

When the valve core 2 moves until the edge of the upper end of the valve core 2 abuts against the conical surface 13, the adjusting piece 4 continues to move upwards, but the valve core 2 is kept at the position and does not continue to move.

As an alternative embodiment, one end of the adjusting member 4 may be fixedly connected to the valve element 2, and when the adjusting member 4 moves, the valve element 2 moves along with the adjusting member 4.

In one embodiment, the limiting seat 6 is in threaded connection with the first flow opening 11, and a second cross groove 62 is disposed at an end of the limiting seat 6 facing away from the elastic member 5, and the third channel 61 is a third through hole penetrating through the limiting seat 6.

The limiting seat 6 is in threaded connection with the first flow port 11, is simple in structure and stable in connection, and can be fixed at different positions of the first flow port 11 according to requirements so as to adjust the compression degree of the elastic piece 5; the setting of the second cross groove 62 can facilitate the assembly, disassembly and position adjustment of the limit seat 6, so that the assembly, disassembly and position adjustment of the limit seat 6 become simple and convenient even if the limit seat 6 is arranged inside the valve cavity 10. The third through hole ensures communication between the first flow port 11 and the first passage 21.

In one embodiment, the limiting seat 6 includes a seat body 63 and a protruding column 64, the outer diameter of the seat body 63 is larger than the outer diameter of the protruding column 64, the seat body 63 is connected with the first flow port 11, and the elastic member 5 is a spring and is sleeved on the outer periphery of the protruding column 64.

The seat 63 is used for connecting with the first flow port 11, the spring is sleeved outside the convex column 64, and one end of the spring is abutted with a step surface formed by the seat 63 and the convex column 64.

In one embodiment, as shown in fig. 3, the outer periphery of the valve body 1 is provided with an outer hexagon 16; the periphery of one end of the valve body 1 is provided with a first thread 17, and the first thread 17 is suitable for being connected with a connecting pipeline 7 of a traveling motor; and/or the outer periphery of the other end of the valve body 1 is provided with a second thread 18, the second thread 18 being adapted to be connected with the lead-out opening of the foot valve 8. Specifically, the end provided with the first thread 17 is the end provided with the first flow opening 11; the end provided with the second thread 18 is the end provided with the second flow opening 12. Of course, the valve body 1 may be used to connect other structures, not limited to the above-described travel motor and foot valve.

The provision of the external hexagonal 16 facilitates the use of auxiliary tools such as wrenches for screwing the valve body 1 to the connecting line 7 of the travel motor and/or to the outlet of the foot valve 8.

In particular, the provision of the first thread 17 and/or the second thread 18 may facilitate the connection of the valve body 1 with other structures. Both the first thread 17 and the second thread 18 can be connected with other throttle pipes in a simple and quick way.

As an alternative embodiment, the end of the valve body 1 provided with the first flow port 11 may be a quick connection port; and/or the end of the valve body 1 provided with the second flow port 12 is a quick-connection port.

In one embodiment, as shown in fig. 3, a limit groove 19 is formed on the outer periphery of the valve body 1, the limit groove 19 is disposed near one end provided with the second flow port 12, and a sealing ring 9 is disposed in the limit groove 19.

The limiting groove 19 can limit and install the sealing ring 9, and the sealing ring 9 can realize sealing connection between the valve body 1 and the export of the foot valve 8.

As an alternative embodiment, two limiting grooves 19 may be provided on the outer periphery of the valve body 1, and each limiting groove 19 may be provided near both ends of the valve body 1, and a sealing ring 9 may be provided in each limiting groove 19.

As an alternative embodiment, the end of the valve body 1 provided with the second flow port 12 may be a quick joint, and the quick joint may be provided with a sealing ring 9.

The adjustment process of the throttle valve 300 provided in the present embodiment includes: the first cross groove 431 applies an acting force to enable the positioning head 43 to rotate, the positioning head 43 drives the ejector rod 42 to move towards the direction of the conical surface 13 in the rotating process, the valve core 2 is pushed to compress the elastic piece 5 to move away from the conical surface 13, the flow passing area of the throttle opening 3 is increased, the throttle opening 3 and the throttle groove 131 simultaneously play a role in throttling, and as shown in fig. 2, the valve core 2 is in a second adjusting position; conversely, the first cross groove 431 applies a reverse acting force to enable the positioning head 43 to reversely rotate, the positioning head 43 drives the ejector rod 42 to move towards a direction away from the conical surface 13 in the rotating process, the valve core 2 moves towards the conical surface 13 under the elastic force of the elastic piece 5, the flow passing area of the throttling port 3 is reduced until the matching part 22 is abutted against the conical surface 13, and only the throttling groove 131 plays a throttling role, as shown in fig. 1, and the valve core 2 is in a first adjusting position.

The throttle valve 300 of the present embodiment, when fluid enters from the first flow port 11 and exits from the second flow port 12, the fluid passes through the third passage 61, the first passage 21, the throttle 3, the second passage 41, and the second flow port 12 in this order, creating a throttle at the throttle 3. When fluid enters from the second flow port 12 and flows out from the first flow port 11, the fluid sequentially passes through the second flow port 12, the second channel 41, the choke 3, the first channel 21 and the third channel 61, and most of the fluid applies thrust to the valve core 2 through the second through hole 411 because the first through hole 212 of the valve core 2 is arranged at the periphery of the second core body 24, so that the valve core 2 is pushed to overcome the elastic force of the elastic member 5 to move, the flow area of the choke 3 is increased, and a smooth flow effect is achieved. When the fluid stops entering from the second flow port 12, the valve element 2 moves toward the second flow port 12 by the elastic force of the elastic member 5 until abutting against the jack 42.

According to another aspect of the present utility model, as shown in fig. 10 and 11, there is further provided a construction machine including the above-mentioned throttle valve 300, and further including the foot valve 8, the control valve 400, and the travel motor. As shown in fig. 11, the left frame shows the lead-out oil passage 100 of the foot valve 8, the right frame shows the working oil passage 200 of the travel motor, two throttle valves 300 and one control valve 400 are provided between the lead-out oil passage 100 and the working oil passage 200, one ends of the two throttle valves 300 are respectively connected to the lead-out ports of the two foot valves 8, the other ends are respectively connected to the two control ends of the control valve 400, and the control valve 400 is connected to the working oil passage 200 of the travel motor.

Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.

Claims (10)

1. A throttle valve (300), characterized by comprising:

The valve comprises a valve body (1), wherein a valve cavity (10) is arranged in the valve body, and a first flow port (11) and a second flow port (12) are respectively arranged at two ends of the valve cavity (10);

The valve core (2) is movably arranged in the valve cavity (10) and forms a throttling port (3) with the cavity wall of the valve cavity (10); a first channel (21) is arranged on the valve core (2), and the first channel (21) is communicated with the throttling port (3) and the first flow port (11);

The adjusting piece (4) is movably arranged at the second flow port (12), one end of the adjusting piece is matched with the valve core (2) and is suitable for driving the valve core (2) to move and changing the flow area of the throttling port (3); a second channel (41) is arranged on the adjusting piece (4), and the second channel (41) is communicated with the throttling port (3) and the second flow port (12);

And one end of the elastic piece (5) is connected with the valve cavity (10), and the other end of the elastic piece is connected with the valve core (2) and is suitable for providing elastic acting force for the valve core (2) towards the direction of the second circulation port (12).

2. The throttle valve (300) according to claim 1, characterized in that a conical surface (13) is arranged on a cavity wall of the valve cavity (10), a matching part (22) is formed by the edge of the valve core (2) facing the second flow port (12), and the throttle port (3) is formed between the conical surface (13) and the matching part (22).

3. The throttle valve (300) according to claim 2, further comprising a throttle groove (131) provided on the tapered surface (13) and communicating the first passage (21) and the second passage (41).

4. A throttle valve (300) according to claim 3, characterized in that the groove depth of the throttle groove (131) increases gradually in a direction towards the second flow opening (12).

5. The throttle valve (300) according to any one of claims 2 to 4, characterized in that a first cylindrical surface (14) is further provided on a chamber wall of the valve chamber (10), the conical surface (13) being provided between the first cylindrical surface (14) and the second flow opening (12);

The valve core (2) comprises a first core body (23) and a second core body (24) which are arranged in a step shape, the first core body (23) is in sliding fit with the first cylindrical surface (14), the second core body (24) is arranged at intervals with the first cylindrical surface (14), and the matching part (22) is arranged on the second core body (24).

6. The throttle valve (300) according to claim 5, wherein the first passage (21) includes a flow hole (211) and a first through hole (212) that communicate with each other, the flow hole (211) penetrating an end face of the first core portion (23) remote from the second core portion (24), the first through hole (212) being provided at an outer periphery of the second core portion (24).

7. The throttle valve (300) according to any one of claims 2 to 4, characterized in that a second cylindrical surface (15) is also provided on the chamber wall of the valve chamber (10), which is arranged between the conical surface (13) and the second flow opening (12);

The regulating piece (4) comprises a push rod (42) and a positioning head (43) which are arranged in a step shape, the push rod (42) is arranged in the second column surface (15) in a penetrating mode, one end, away from the positioning head (43), of the push rod (42) is suitable for being abutted to the valve core (2), and the positioning head (43) is connected with the side wall of the second flow port (12) through threads.

8. The throttle valve (300) according to claim 7, wherein the second passage (41) includes a second through hole (411) and a flow groove (412) communicating with each other, the second through hole (411) penetrating the ejector pin (42) and an end face of the positioning head (43), the flow groove (412) being provided on the ejector pin (42) and communicating with the throttle port (3).

9. The throttle valve (300) according to any one of claims 1 to 4, further comprising a limiting seat (6) connected to the first flow port (11), wherein a third channel (61) is provided on the limiting seat (6), and the third channel (61) communicates with the first flow port (11) and the first channel (21); the elastic piece (5) is arranged between the valve core (2) and the limiting seat (6).

10. A working machine, characterized by comprising a throttle valve (300) according to any one of claims 1-9.