CN219549681U - Reversing valve anti-blocking structure and reversing valve - Google Patents

Abstract

The utility model provides a reversing valve anti-blocking structure and a reversing valve, and relates to the technical field of control valves. The reversing valve anti-blocking structure comprises an axial gap, wherein the axial gap is arranged between at least one end of the valve core and a side wall of the main body corresponding to at least one end of the valve core along the axial direction of a port in the valve core. Because the axial clearance sets up along the axial direction of port in the case, reduce the case and probably because of axial float produces friction in the rotation process, the axial clearance sets up between the main part lateral wall that at least one end of case and at least one end of case correspond, plays the effect of middle isolation between case and port and the main part lateral wall rather than corresponding, reduces the risk of case and main part mutual contact, reduces the port of case and has the risk of frictional resistance when rotatory to reduce the switching-over moment of torsion of switching-over valve.

Description

Reversing valve anti-blocking structure and reversing valve

Technical Field

The utility model relates to the technical field of control valves, in particular to a reversing valve anti-blocking structure and a reversing valve.

Background

The reversing valve is a directional control valve with more than two flowing forms and more than two oil ports, so as to realize the circulation, cutting-off and reversing of media, and pressure unloading and sequential action control, wherein the media are specifically refrigerant with refrigeration oil.

When the existing reversing valve is used for reversing, friction is easy to occur between the valve core and the valve body or other parts, the valve core has larger back pressure, the valve core is caused to receive larger resistance, and the reversing torque of the reversing valve is increased, so that the use reliability of the reversing valve is affected.

Disclosure of Invention

The reversing valve anti-blocking structure and the reversing valve provided by the utility model have the advantages that the friction resistance of the valve core is reduced, and the use reliability of the reversing valve is improved.

According to a first aspect of the present utility model, there is provided a reversing valve anti-blocking structure, the reversing valve including a main body and a spool disposed within the main body, the reversing valve anti-blocking structure comprising:

and the axial gap is arranged between at least one end of the valve core and the side wall of the main body corresponding to the at least one end of the valve core along the axial direction of the main body.

In some of these embodiments, the axial gap is 0.5mm or less.

In some embodiments, the reversing valve anti-blocking structure further comprises:

the gasket is arranged between at least one end of the valve core and the side wall of the main body corresponding to the at least one end of the valve core.

In some of these embodiments, an axial spacing is provided between at least one end of the spool and its corresponding shim.

In some embodiments, the axial spacing is 0.5mm or less.

In some embodiments, the pad is made of a wear resistant material.

According to a second aspect of the present utility model, there is also provided a reversing valve according to an embodiment of the present utility model, including:

a main body provided with a first flow port, a second flow port, a third flow port and a fourth flow port;

the valve core is rotatably arranged in the main body, one end of the valve core is communicated with the first circulation port, and the other end of the valve core is selectively communicated with the second circulation port or the third circulation port;

the reversing valve anti-blocking structure is arranged between at least one end of the valve core and the side wall of the main body corresponding to at least one end of the valve core.

In some of these embodiments, the body comprises:

the first flow port and the fourth flow port are arranged on the valve body;

the end cover is arranged on one side, far away from the first flow port, of the valve body, and the second flow port and the third flow port are arranged on the end cover;

the axial gap of the reversing valve anti-blocking structure is arranged between one end of the valve core, which is close to the end cover, and the end cover.

In some embodiments, a gasket of the reversing valve anti-blocking structure is disposed between one end of the valve core near the end cover and the end cover.

In some embodiments, the gasket of the reversing valve anti-blocking structure is provided with two communication holes and a mounting through hole, the two communication holes are respectively communicated with the second flow port and the third flow port in a corresponding manner, the mounting through hole is arranged between the two communication holes, the valve core is provided with a rotating shaft, and the rotating shaft penetrates through the mounting through hole.

In some embodiments, one of the gasket of the reversing valve anti-blocking structure and the end cover corresponding to the gasket is provided with a positioning protrusion, and the other one of the gasket of the reversing valve anti-blocking structure and the end cover is provided with a positioning hole, and the positioning protrusion penetrates through the positioning hole and is used for positioning between the gasket and the end cover.

In some embodiments, the main body further comprises a first flange, the first flange is disposed on one side, away from the end cover, of the valve body, the first flow port is disposed corresponding to the first flange, and the axial gap of the reversing valve anti-blocking structure is further disposed between one end, away from the end cover, of the valve core and the first flange.

In some embodiments, a gasket of the reversing valve anti-blocking structure is disposed between an end of the valve spool remote from the end cap and the first flange.

In some embodiments, the reversing valve further comprises;

the transmission mechanism is connected with the valve core;

the output end of the driving source is connected to the transmission mechanism, and the driving source drives the valve core to rotate relative to the main body through the transmission mechanism.

One embodiment of the present utility model has the following advantages or benefits:

according to the reversing valve anti-blocking structure provided by the embodiment of the utility model, the axial gap is arranged along the axial direction of the main body, so that friction possibly generated by axial movement of the valve core in the rotating process is reduced, the axial gap is arranged between at least one end of the valve core and the side wall of the main body corresponding to at least one end of the valve core, the function of middle isolation between the port of the valve core and the side wall of the main body corresponding to the port of the valve core is achieved, the risk of mutual contact between the valve core and the main body is reduced, the risk of friction resistance of the port of the valve core in the rotating process is reduced, and the reversing torque of the reversing valve is reduced.

The reversing valve provided by the embodiment of the utility model is characterized in that the main body is provided with four flow ports, namely a first flow port, a second flow port, a third flow port and a fourth flow port, and the reversing valve is specifically a four-way valve according to the number of the flow ports. When the reversing valve is in a first state, the valve core can rotate relative to the main body, one end of the valve core, which is far away from the first flow port, rotates to the second flow port, at the moment, the first flow port is communicated with the second flow port, and the third flow port is communicated with the fourth flow port through the inner cavity of the main body. When the reversing valve is in the second state, the valve core can rotate relative to the main body, one end of the valve core, which is far away from the first flow port, rotates to the third flow port, at the moment, the first flow port is communicated with the third flow port, and the second flow port is communicated with the fourth flow port through the inner cavity of the main body.

The reversing valve anti-blocking structure is arranged between at least one end of the valve core and the side wall of the main body corresponding to the at least one end of the valve core, when the valve core is rotated to switch the working state, the friction resistance between the port of the valve core and the side wall of the main body is reduced, the smoothness of the switching of the working state of the reversing valve is improved, and therefore the usability of the reversing valve is improved.

Drawings

For a better understanding of the utility model, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present utility model. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views. The above and other features and advantages of the present utility model will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Wherein:

FIG. 1 is a schematic view showing the overall structure of a reversing valve according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a reversing valve according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a reversing valve according to an embodiment of the utility model in a first state;

FIG. 4 is a schematic view of a reversing valve according to an embodiment of the utility model in a second state;

FIG. 5 is a schematic view showing the structure of a valve element in a reversing valve according to an embodiment of the present utility model;

FIG. 6 is a schematic view showing the structure of a driven gear in a reversing valve according to an embodiment of the present utility model;

FIG. 7 is a schematic view of the installation of an end cap, a first gasket and a valve spool in a reversing valve according to an embodiment of the utility model;

FIG. 8 is an exploded view of an end cap, a first gasket and a valve spool of a reversing valve according to an embodiment of the present utility model;

FIG. 9 is a schematic diagram showing the structure of an end cover in a reversing valve according to an embodiment of the present utility model;

fig. 10 shows a second schematic structural view of an end cap in a reversing valve according to an embodiment of the utility model.

Wherein reference numerals are as follows:

1. a valve core; 2. a main body; 3. a first gasket; 4. a second gasket; 5. a driving source; 6. a transmission mechanism; 7. a controller; 8. a first bearing; 9. a second bearing; 10. a retainer ring;

11. a straight pipe section; 111. a connecting key; 12. a sloped tube portion; 13. a rotation shaft;

201. a first flow port; 202. a second flow port; 203. a third flow port; 204. a fourth flow port;

20. a valve body; 21. a first flange; 22. a second flange; 23. a third flange; 24. a fourth flange; 25. an end cap; 251. positioning the bulge; 252. a first oil guide groove; 253. a second oil guide groove;

31. a communication hole; 32. mounting through holes; 33. positioning holes;

51. driving the cover plate; 52. a drive bearing; 53. clamping springs;

61. a drive gear; 62. a driven gear; 621. a key slot;

71. binding posts; 72. and controlling the cover plate.

Detailed Description

The technical solutions in the exemplary embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present utility model. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present utility model, and it should be understood that various modifications and changes can be made to the example embodiments without departing from the scope of the utility model.

In the description of the present utility model, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present utility model, it should be understood that the terms "upper", "lower", "inner", "outer", and the like in the exemplary embodiments of the present utility model are described in terms of the drawings, and should not be construed as limiting the exemplary embodiments of the present utility model. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

The embodiment provides a reversing valve for realizing circulation, cutting-off and reversing of hydraulic oil. As shown in fig. 1-2, the reversing valve comprises a main body 2 and a valve core 1, wherein the main body 2 is provided with a first flow port 201, a second flow port 202, a third flow port 203 and a fourth flow port 204, the valve core 1 is rotatably arranged in the main body 2, one end of the valve core 1 is communicated with the first flow port 201, and the other end of the valve core 1 is selectively communicated with the second flow port 202 or the third flow port 203.

The reversing valve provided in this embodiment has four flow ports, i.e., a first flow port 201, a second flow port 202, a third flow port 203, and a fourth flow port 204, in the main body 2, and is specifically a four-way valve according to the number of the flow ports. As shown in fig. 3, when the reversing valve is in the first state, the valve core 1 can rotate relative to the main body 2, and one end of the valve core 1 away from the first flow port 201 rotates to the second flow port 202, at this time, the first flow port 201 communicates with the second flow port 202, and the third flow port 203 communicates with the fourth flow port 204 through the inner cavity of the main body 2. As shown in fig. 4, when the reversing valve is in the second state, the valve core 1 can rotate relative to the main body 2, and the end of the valve core 1 away from the first flow port 201 rotates to the third flow port 203, at this time, the first flow port 201 communicates with the third flow port 203, and the second flow port 202 communicates with the fourth flow port 204 through the inner cavity of the main body 2.

It should be noted that the first state and the second state may be specifically one of a cooling state and a heating state in the air conditioning system. That is, when the first state is the cooling state, the second state is the heating state; when the first state is a heating state, the second state is a cooling state. The reversing valve mainly rotates in the main body 2 through the valve core 1, so that the other end of the valve core 1 is switched between the second flow port 202 and the third flow port 203, and the purposes of reversing and switching the refrigerating/heating states are achieved. It will be appreciated that the first state and the second state include, but are not limited to, switching between cooling and heating, and switching between other different working states, and may be adjusted according to actual production requirements, and the embodiment is not limited thereto.

The first flow port 201 communicates with the compressor return port, the fourth flow port 204 communicates with the compressor discharge port, and the second flow port 202 and the third flow port 203 communicate with the condenser and the evaporator. The hydraulic oil flowing through each flow port is a refrigerant and is accompanied by a refrigerant oil.

Specifically, as shown in fig. 3, in the first state, the inner cavity of the main body 2 is a high-pressure cavity, hydraulic oil enters the inner cavity of the main body 2 from the fourth flow port 204 and flows out through the third flow port 203, and low-pressure oil enters the valve core 1 from the second flow port 202 and flows out through the first flow port 201, and at this time, the valve core 1 is a low-pressure cavity; as shown in fig. 4, in the second state, the inner cavity of the main body 2 is a high-pressure cavity, hydraulic oil enters the inner cavity of the main body 2 from the fourth flow port 204 and flows out through the second flow port 202, and low-pressure oil enters the valve element 1 from the third flow port 203 and flows out through the first flow port 201, and at this time, the valve element 1 is a low-pressure cavity.

In one embodiment, as shown in fig. 2-4, the main body 2 of the reversing valve includes a valve body 20, the valve body 20 has an appearance similar to a cuboid structure, the valve body 20 has a hollow structure, and a cavity of the valve body 20 is an inner cavity of the main body 2 and may also be called a high-pressure cavity. The first circulation port 201 and the fourth circulation port 204 are provided in the valve body 20, the fourth circulation port 204 is provided on the top surface of the valve body 20, the first circulation port 201 is provided on one side of the valve body 20, and an opening is provided on the other side.

In one embodiment, as shown in fig. 2 to 4, the main body 2 of the reversing valve further includes a first flange 21, the first flange 21 is fixedly disposed on a side surface of the valve body 20 by bolts, and the first flange 21 is disposed opposite to the first flow port 201. The first flange 21 is provided with a first through hole corresponding to the first through hole 201, so that low-pressure oil flows out from the valve core 1 through the first through hole 201 and the first through hole

In one embodiment, the body 2 of the reversing valve further includes an end cap 25, the end cap 25 being disposed on a side of the valve body 20 remote from the first flow port 201, the second flow port 202 and the third flow port 203 being disposed on the end cap 25.

The end cover 25 may also be called an exhaust flange, the shape of the end cover 25 is similar to a cuboid sheet structure, the end cover 25 is disposed on one side of the valve body 20 away from the first flow port 201, and the end cover 25 plays a role in blocking an opening end of the valve body 20. The second flow port 202 and the third flow port 203 are disposed on the end cover 25, and the end cover 25 provides the positions for the two flow ports, and the two flow ports serve as the switching ports of the valve core 1 and are disposed on the same end cover 25, so that the valve core 1 and the two flow ports can be switched conveniently.

In one embodiment, the main body 2 of the reversing valve further includes a second flange 22 and a third flange 23, where the second flange 22 and the third flange 23 are fixedly disposed on the end cover 25 through bolts, the second flange 22 is disposed opposite to the second flow port 202, and the second flange 22 is provided with a second through hole corresponding to the second flow port 202. The third flange 23 is disposed opposite to the third flow opening 203, and the third flange 23 is provided with a third through hole corresponding to the third flow opening 203.

In one embodiment, as shown in fig. 2, the main body 2 of the reversing valve further includes a fourth flange 24, the fourth flange 24 is fixedly disposed on the top of the valve body 20 through bolts, the fourth flange 24 is disposed opposite to the fourth flow port 204, and a fourth through hole is disposed on the fourth flange 24 corresponding to the fourth flow port 204.

In the first state, as shown in fig. 3, hydraulic oil enters the chamber of the valve body 20 through the fourth through-hole and the fourth flow port 204, and flows out through the third flow port 203 and the third through-hole, and low-pressure oil enters the valve element 1 from the second through-hole and the second flow port 202, and flows out through the first flow port 201 and the first through-hole; in the second state, as shown in fig. 4, high-pressure oil enters the chamber of the valve body 20 through the fourth through-hole and the fourth through-hole 204, and flows out through the second through-hole 202 and the second through-hole, and low-pressure oil enters the valve element 1 from the third through-hole and the third through-hole 203, and flows out through the first through-hole 201 and the first through-hole.

In one embodiment, as shown in fig. 2-4, the reversing valve further includes a driving source 5 and a transmission mechanism 6, the transmission mechanism 6 is connected to the valve core 1, an output end of the driving source 5 is connected to the transmission mechanism 6, and the driving source 5 drives the valve core 1 to rotate relative to the main body 2 through the transmission mechanism 6.

The driving source 5 can provide driving force, and the driving source 5 is a driving motor, however, in other embodiments, other driving devices may be used for the driving source 5, which is not limited herein. The driving force of the driving source 5 is transmitted to the valve core 1 through the transmission mechanism 6 by the driving source 5 and the transmission mechanism 6 being connected to each other, so that the rotation of the valve core 1 relative to the main body 2 is achieved. Wherein, the transmission mechanism 6 plays a role in driving force transmission, and the transmission mechanism 6 is arranged at one end of the valve core 1 and close to the first flow port 201, and the driving source 5 drives the transmission mechanism 6 to rotate, so as to drive the valve core 1 to rotate and reverse.

Specifically, as shown in fig. 2, the main body 2 is provided with a driving cavity for accommodating the driving source 5, and after the driving source 5 is placed in the driving cavity and fixed by the snap spring 53, a driving cover plate 51 is covered on the outer side of the driving cavity to realize the blocking of the driving cavity. The output shaft and the rear end of the driving source 5 may be provided with a driving bearing 52 to ensure smoothness of rotation of the driving source 5.

In one embodiment, as shown in fig. 2, the reversing valve further includes a controller 7, and the main body 2 is further provided with a control chamber for accommodating the controller 7, and the controller 7 is electrically connected to the driving source 5 through a terminal post 71 for controlling the rotation angle and the rotation direction of the driving source 5. After the controller 7 is placed in the control chamber, a control cover plate 72 is arranged on the outer side of the control chamber to realize the blocking of the control chamber.

In one embodiment, as shown in fig. 2-4, the transmission mechanism 6 includes a driving gear 61 and a driven gear 62, the driving gear 61 is connected to the output end of the driving source 5, the driven gear 62 is sleeved on one end of the valve core 1 near the first flow port 201, and the driving gear 61 and the driven gear 62 are meshed with each other. The driving source 5 drives the driving gear 61 to rotate, and as the driving gear 61 rotates, the driven gear 62 is driven to rotate under the meshing transmission action of the driving gear 61 and the driven gear 62, and the valve core 1 is driven to rotate by the rotation of the driven gear 62. Through the mutual engagement of the driving gear 61 and the driven gear 62, the transmission can be realized in a mode that the pinion drives the large gear to rotate, so that the driving force is saved.

In one embodiment, as shown in fig. 2 and 4 to 5, the valve element 1 includes a straight pipe portion 11 and an inclined pipe portion 12, one end of the straight pipe portion 11 is disposed opposite to the first flow port 201, the other end is connected to the straight pipe portion 11, and one end of the inclined pipe portion 12 remote from the straight pipe portion 11 selectively communicates with the second flow port 202 and the third flow port 203.

As shown in fig. 5-6, one of the straight pipe portion 11 of the valve core 1 and the inner wall of the driven gear 62 is provided with a connection key 111, and the other is provided with a key slot 621, and the connection key 111 is clamped in the key slot 621, so that connection between the straight pipe portion 11 of the valve core 1 and the driven gear 62 is realized, and the driven gear 62 can drive the straight pipe portion 11 of the valve core 1 to rotate.

In one embodiment, as shown in fig. 2 and 5, the valve core 1 further includes a rotation shaft 13, the rotation shaft 13 is disposed on the inclined tube portion 12, the main body 2 is provided with a shaft hole corresponding to the rotation shaft 13, and the rotation shaft 13 is disposed through the shaft hole.

The rotary shaft 13 of the valve core 1 penetrates through the shaft hole of the main body 2, and the rotary shaft 13 provides a rotary center for the valve core 1 and also plays a role in supporting the valve core 1 in the rotating process. When the straight pipe portion 11 is rotated, the rotation shaft 13 is provided to the inclined pipe portion 12 of the valve element 1, and the inclined pipe portion 12 is rotated about the rotation shaft 13 as a rotation center, instead of being rotated about its own axis, so that the end of the inclined pipe portion 12 remote from the straight pipe portion 11 can be switched between the second flow port 202 and the third flow port 203.

In one embodiment, as shown in fig. 2 and fig. 4-5, the reversing valve further includes a first bearing 8, a bearing chamber is disposed in the main body 2, the first bearing 8 is disposed in the bearing chamber and sleeved on the straight tube portion 11 of the valve core 1, so as to improve the smoothness of rotation of the straight tube portion 11 of the valve core 1. Meanwhile, the first bearing 8 is beneficial to positioning the valve core 1, so that the valve core 1 is not easy to incline, the valve core 1 is not easy to rub with the valve body 20, and the friction resistance of the valve core 1 is reduced.

It can be understood that the number of the first bearings 8 may be plural, and the plural first bearings 8 are arranged in parallel and at intervals, so as to further facilitate the free rotation of the straight pipe portion 11 of the valve core 1. A check ring 10 is arranged between two adjacent first bearings 8, the check ring 10 is sleeved on a straight pipe part 11 of the valve core 1, and the check ring 10 plays a role in spacing the two adjacent first bearings 8 and plays a role in bearing limiting.

It will be appreciated that the present embodiment takes two first bearings 8 as an example, and the actual number of first bearings 8 is not limited and may be adjusted according to the actual production situation.

In one embodiment, as shown in fig. 2 and 4-5, the reversing valve further includes a second bearing 9, where the second bearing 9 is disposed in the shaft hole and sleeved outside the rotating shaft 13. By providing the rotary shaft 13 between the rotary shaft 13 and the shaft hole, the smoothness of rotation of the rotary shaft 13 of the valve element 1 is improved.

If the reversing valve needs reversing, friction is easy to occur between the valve core 1 and the valve body 20 or other parts, so that the valve core 1 has larger back pressure, the valve core 1 receives larger resistance, the reversing torque of the reversing valve is increased, and the use reliability of the reversing valve is affected.

In order to solve this problem, the reversing valve provided in this embodiment further includes a reversing valve anti-blocking structure disposed between at least one end of the valve core 1 and a sidewall of the main body 2 corresponding to at least one end of the valve core 1.

According to the reversing valve provided by the embodiment, the reversing valve anti-blocking structure is arranged between at least one end of the valve core 1 and the side wall of the main body 2 corresponding to at least one end of the valve core 1, when the valve core 1 is rotated to switch the working state, the friction resistance between the port of the valve core 1 and the side wall of the main body 2 is reduced, the smoothness of the switching of the working state of the reversing valve is improved, and therefore the use reliability of the reversing valve is improved.

Specifically, the reversing valve anti-blocking structure includes an axial gap that is disposed along the axial direction of the main body 2 and between at least one end of the valve spool 1 and a side wall of the main body 2 corresponding to at least one end of the valve spool 1.

The axial direction of the main body 2 is specifically the direction of the dash-dot line shown in fig. 2.

According to the reversing valve anti-blocking structure, the axial gap is formed along the axial direction of the main body 2, friction possibly generated by axial movement of the valve core 1 in the rotation process is reduced, the axial gap is formed between at least one end of the valve core 1 and the side wall of the main body 2 corresponding to at least one end of the valve core 1, the function of middle isolation between the port of the valve core 1 and the side wall of the main body 2 corresponding to the port is achieved, the risk of mutual contact between the valve core 1 and the main body 2 is reduced, the risk of friction resistance existing at the port of the valve core 1 in the rotation process is reduced, and therefore reversing torque of the reversing valve is reduced.

In one embodiment, the axial gap is less than or equal to 0.5mm.

If the axial clearance is larger than 0.5mm, the axial clearance is larger, and the risk of leakage of hydraulic oil can exist, and for this reason, the axial clearance is smaller than or equal to 0.5mm, so that the axial clearance is designed within a certain range, and the purpose of reducing the friction resistance of the valve core 1 can be achieved while the hydraulic oil can have certain leakage, and the requirement of certain leakage quantity can be met.

In one embodiment, as shown in fig. 2 and fig. 4 to 5, the reversing valve anti-blocking structure further includes a gasket disposed between at least one end of the valve core 1 and a sidewall of the main body 2 corresponding to at least one end of the valve core 1.

If the axial clearance between the valve core 1 and the side wall of the main body 2 is directly and accurately controlled through machining, the problems of high machining difficulty and high machining cost exist. For this reason, the axial clearance between case 1 and the lateral wall of main part 2 is workable bigger, is provided with the gasket between the main part 2 lateral wall that at least one end of case 1 and the at least one end of case 1 correspond, can select the gasket of suitable thickness according to actual demand, because the thickness of gasket is more controllable, the thickness of gasket can be according to the clearance between case 1 and the lateral wall of main part 2 and select the joining in marriage to reduce case 1 and the processing cost and the processing degree of difficulty of main part 2.

In one embodiment, the pad is made of a wear resistant material.

Namely, due to vibration and other reasons, the valve core 1 and the gasket are likely to be contacted, and the gasket made of the wear-resistant material is not only beneficial to reducing friction resistance, but also can reduce friction loss between the valve core 1 and the gasket, and plays a role in prolonging service life.

In one embodiment, an axial spacing is provided between at least one end of the spool 1 and its corresponding spacer.

After installing the gasket, be provided with axial interval between at least one end of case 1 and the gasket that corresponds, play the effect of keeping apart in the middle between the port of case 1 and the gasket that corresponds with it, reduce the risk of case 1 and gasket contact each other, reduce the port of case 1 and have the risk of frictional resistance when rotatory to reduce the switching-over moment of torsion of switching-over valve.

In one embodiment, the axial spacing is 0.5mm or less.

If the axial spacing is greater than 0.5mm, the axial spacing is relatively large, and there may be a risk of hydraulic oil leakage. Therefore, the axial interval is smaller than or equal to 0.5mm, and the axial interval is designed within a certain range, so that the hydraulic oil can have certain leakage, and the aim of reducing the friction resistance of the valve core 1 can be achieved while the requirement of certain leakage amount can be met.

As shown in fig. 2 and fig. 7-8, since the end of the valve core 1 away from the first flow port 201 corresponds to the end cover 25, an axial gap of the reversing valve anti-blocking structure is provided between the end of the valve core 1 close to the end cover 25 and the end cover 25, and the axial gap can reduce the rotational friction resistance between the end of the valve core 1 away from the first flow port 201 and the end cover 25, so that the reversing torque of the reversing valve is reduced.

In one embodiment, as shown in fig. 2 and 7-8, the gasket includes a first gasket 3, the first gasket 3 being disposed between an end of the spool 1 proximate the end cap 25 and the end cap 25.

In order to avoid the need of precisely processing the valve core 1 and the end cover 25 when the axial gap is met, the first gasket 3 is arranged between one end, close to the end cover 25, of the valve core 1 and the end cover 25, and the thickness of the first gasket 3 is convenient to control, so that the axial gap between the valve core 1 and the end cover 25 can be processed relatively large, and then the first gasket 3 with proper thickness is selected according to the actual size, so that the axial gap between the first gasket 3 and the valve core 1 meets the requirement, namely, the axial gap is smaller than or equal to 0.5mm. In this way, the thickness of the first gasket 3 is selected according to the gap between the valve core 1 and the end cover 25, so that the processing difficulty of the valve core 1 and the end cover 25 is reduced, and the aim of reducing the production cost is achieved. In addition, even if the valve element 1 and the first gasket 3 come into contact with each other due to vibration or the like, the first gasket 3 contributes to reduction of the frictional resistance of the valve element 1.

Specifically, as shown in fig. 2 and 7 to 8, the first gasket 3 is provided with two communication holes 31 and a mounting through hole 32, the two communication holes 31 are respectively communicated with the second flow port 202 and the third flow port 203 in correspondence, the mounting through hole 32 is provided between the two communication holes 31, the spool 1 is provided with a rotary shaft 13, and the rotary shaft 13 is provided to pass through the mounting through hole 32.

The two communication holes 31 of the first gasket 3 communicate with the second communication hole 202 and the third communication hole 203, respectively, so that the first gasket 3 functions as a barrier between the valve element 1 and the end cap 25, but the first gasket 3 does not affect the flow of hydraulic oil, and the two communication holes 202 and the third communication hole 203 communicate with the valve element 1 through the communication holes 31. By providing the mounting through hole 32 between the two communication holes 31, the mounting through hole 32 plays a role of mounting the rotary shaft 13 of the valve element 1, the mounting through hole 32 and the shaft hole are correspondingly arranged, and the rotary shaft 13 penetrates through the mounting through hole 32 and the shaft hole so as to achieve a role of supporting the rotary center of the valve element 1.

It should be noted that, the rotary shaft 13 of the valve core 1 is inserted through the corresponding mounting through hole 32, but the end of the valve core 1 facing the end cover 25 is not inserted through the communication hole 31, otherwise, the valve core 1 is blocked in the communication hole 31, and the valve core 1 is difficult to rotate and reverse, so that a certain axial interval exists between the valve core 1 and the first gasket 3, which is beneficial to the rotation and the reverse of the valve core 1.

In one embodiment, one of the first gasket 3 and the end cap 25 is provided with a positioning projection 251, and the other is provided with a positioning hole 33, and the positioning projection 251 is penetrated through the positioning hole 33 to achieve positioning between the first gasket 3 and the end cap 25.

It should be specifically noted that, the first gasket 3 is provided with positioning protrusions 251 corresponding to the two communication holes 31, and when the valve core 1 is switched between two working states, the positioning protrusions 251 can also position the valve core 1, so as to ensure the stability of the position of the valve core 1 in different states. It can be understood that the positioning protrusion 251 below the communication hole 31 can realize positioning of the valve core 1 and also has a bearing function on the valve core 1, so that the stability of the position of the valve core 1 is further improved.

In one embodiment, as shown in fig. 2 and 9 to 10, a first oil guiding groove 252 is provided at a side of the end cap 25 facing the first gasket 3, the first oil guiding groove 252 has a ring-shaped structure, and the first oil guiding groove 252 is correspondingly provided at an outside of the communication hole 31 and may be provided along an edge of the communication hole 31. The end cover 25 is further provided with a second oil guiding groove 253 towards one side of the first gasket 3, the second oil guiding groove 253 is of an annular structure, the second oil guiding groove 253 is correspondingly arranged outside the two communication holes 31, the second oil guiding groove 253 is communicated with the first oil guiding groove 252, the first gasket 3 is provided with through holes, the through holes are respectively communicated with the first oil guiding groove 252 and the second oil guiding groove 253, hydraulic oil in the main body 2 enters the second oil guiding groove 253 through the through holes and flows to the first oil guiding groove 252, and flows out to the position between the end face of the valve core 1 and the first gasket 3 through the through holes communicated with the first oil guiding groove 252, so that oil sealing and lubrication between the end face of the valve core 1 and the first gasket 3 are realized. Of course, the number of the first oil guiding grooves 252 and the second oil guiding grooves 253 may be plural, and the number of the first oil guiding grooves 252 and the second oil guiding grooves 253 is not limited in this embodiment, and may be adjusted according to actual production requirements.

In one embodiment, since the end of the valve core 1 near the first flow port 201 is disposed corresponding to the first flange 21, the first flange 21 is disposed on the side of the valve body 20 far away from the end cover 25, and the first flow port 201 is disposed corresponding to the first flange 21, an axial gap of the reversing valve anti-blocking structure is further disposed between the end of the valve core 1 far away from the end cover 25 and the first flange 21. The axial clearance can reduce the planar friction resistance between the end of the valve core 1 near the first flow port 201 and the first flange 21, so that the reversing torque of the reversing valve is reduced.

In one embodiment, as shown in fig. 2, the gasket further comprises a second gasket 4, the second gasket 4 being disposed between the end of the valve spool 1 remote from the end cap 25 and the first flange 21.

In order to avoid the need of precisely processing the valve core 1 and the first flange 21 when the axial gap is met, the second gasket 4 is arranged between one end, far away from the end cover 25, of the valve core 1 and the first flange 21, and the thickness of the second gasket 4 is convenient to control, so that the axial gap between the valve core 1 and the first flange 21 can be processed relatively large, and then the second gasket 4 with proper thickness is selected according to the actual size, so that the axial gap between the second gasket 4 and the valve core 1 meets the requirement, namely, the axial gap is smaller than or equal to 0.5mm.

In this way, the thickness of the second gasket 4 can be selected according to the gap between the valve core 1 and the first flange 21, so that the processing difficulty of the valve core 1 and the first flange 21 is reduced, and the aim of reducing the production cost is achieved. In addition, even if the valve element 1 and the second gasket 4 come into contact with each other due to vibration or the like, the second gasket 4 contributes to reduction of the frictional resistance of the valve element 1.

In one embodiment, the second gasket 4 is in a ring structure, the center of the second gasket 4 is provided with a central hole, and the first flow port 201 is communicated with the first through hole of the first flange 21 through the central hole of the second gasket 4, so that the second gasket 4 can play a role of blocking between the valve core 1 and the first flange 21, but the second gasket 4 cannot influence the flow of hydraulic oil.

It should be noted herein that the reversing valve anti-blocking structure shown in the drawings and described in this specification is merely one example of the principles of the present utility model. It will be clearly understood by those of ordinary skill in the art that the principles of the present utility model are not limited to any details or any components of the devices shown in the drawings or described in the specification.

It should be understood that the utility model is not limited in its application to the details of construction and the arrangement of components set forth in the specification. The utility model is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications are intended to fall within the scope of the present utility model. It should be understood that the utility model disclosed and defined in this specification extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute various alternative aspects of the present utility model. The embodiments described in this specification illustrate the best mode known for carrying out the utility model and will enable those skilled in the art to make and use the utility model.

Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the utility model being indicated by the following claims.

It is to be understood that the utility model is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.

Claims (14)

1. The utility model provides a structure is prevented hindering by switching-over valve, its characterized in that, the switching-over valve includes main part and case, the case set up in the main part, the structure is prevented hindering by the switching-over valve includes:

and the axial gap is arranged between at least one end of the valve core and the side wall of the main body corresponding to the at least one end of the valve core along the axial direction of the main body.

2. The reversing valve drag preventing structure according to claim 1, wherein the axial clearance is 0.5mm or less.

3. The reversing valve preventing and blocking structure according to claim 1, further comprising:

the gasket is arranged between at least one end of the valve core and the side wall of the main body corresponding to the at least one end of the valve core.

4. The reversing valve anti-blocking structure according to claim 3, wherein an axial space is provided between at least one end of the valve spool and the corresponding gasket.

5. The reversing valve drag preventing structure according to claim 4, wherein the axial spacing is 0.5mm or less.

6. The reversing valve drag preventing structure according to any one of claims 3 to 5, wherein the gasket is made of wear resistant material.

7. A reversing valve, comprising:

a main body provided with a first flow port, a second flow port, a third flow port and a fourth flow port;

the valve core is rotatably arranged in the main body, one end of the valve core is communicated with the first circulation port, and the other end of the valve core is selectively communicated with the second circulation port or the third circulation port;

the reversing valve drag preventing structure according to any one of claims 1 to 6, provided between at least one end of the spool and a side wall of the main body corresponding to the at least one end of the spool.

8. The reversing valve of claim 7, wherein the body includes:

the first flow port and the fourth flow port are arranged on the valve body;

the end cover is arranged on one side, far away from the first flow port, of the valve body, and the second flow port and the third flow port are arranged on the end cover;

the axial gap of the reversing valve anti-blocking structure is arranged between one end of the valve core, which is close to the end cover, and the end cover.

9. The reversing valve of claim 8, wherein a gasket of the reversing valve anti-blocking structure is disposed between the end of the valve spool adjacent the end cap and the end cap.

10. The reversing valve according to claim 9, wherein the gasket of the reversing valve anti-blocking structure is provided with two communication holes and a mounting through hole, the two communication holes are respectively communicated with the second flow port and the third flow port in a corresponding manner, the mounting through hole is arranged between the two communication holes, the valve core is provided with a rotating shaft, and the rotating shaft penetrates through the mounting through hole.

11. The reversing valve according to claim 10, wherein one of the gasket of the reversing valve anti-blocking structure and the end cover corresponding to the gasket is provided with a positioning protrusion, and the other one is provided with a positioning hole, and the positioning protrusion penetrates through the positioning hole and is used for positioning between the gasket and the end cover.

12. The reversing valve of claim 8, wherein the body further comprises a first flange disposed on a side of the valve body away from the end cap, the first flow opening is disposed corresponding to the first flange, and the axial gap of the reversing valve anti-blocking structure is further disposed between the end of the valve core away from the end cap and the first flange.

13. The reversing valve of claim 12, wherein a gasket of the reversing valve anti-blocking structure is disposed between an end of the valve spool remote from the end cap and the first flange.

14. The reversing valve of any one of claims 7-13, wherein the reversing valve further comprises;

the transmission mechanism is connected with the valve core;

the output end of the driving source is connected to the transmission mechanism, and the driving source drives the valve core to rotate relative to the main body through the transmission mechanism.