Pressure compensation valve

Abstract

A pressure compensation valve, comprising: a valve body (1), provided with an oil inlet, an oil outlet, and a load feedback port; a valve core hole (20), axially provided with a first counterbore (12) and a second counterbore (13) respectively connected to the oil inlet and the oil outlet; end covers, used for covering two end portions of the valve core hole; a valve stem (2), arranged in the valve core hole; a spring sleeve (5), arranged in the valve core hole and provided with an annular groove connected to the load feedback port; a spring (3), arranged in the spring sleeve and in contact with an end portion of the valve stem; a pilot-operated relief valve (4), of which a first oil port is connected to the spring sleeve; a first oil passage (17), arranged inside the valve stem and configured to introduce oil into the end portions of the valve core hole to generate oil pressure so as to push the valve stem and compress the spring; a second oil passage (18), connected to the first counterbore and the first oil port of the pilot-operated relief valve and configured to introduce the oil into the first oil port of the pilot-operated relief valve; and a third oil passage (19), connected to a second oil port of the pilot-operated relief valve and the annular groove on the spring sleeve. A pressure difference is set more accurately and regulated more conveniently.

Description

Pressure compensation valve TECHNICAL FIELD

[0001] The present application belongs to the technical field of engineering machinery, and particularly relates to a pressure compensation valve. BACKGROUND

[0002] Most of the existing pressure compensation valves use adjusting bolts to adjust the pressure difference, and the precision of mechanical adjustment is not high, which may cause inaccurate adjustment of the pressure difference. In addition, when adjusting the pressure of the pressure compensation valve, the sealing nut on the adjusting bolt needs to be loosened first, and then the adjustment is performed, which may cause oil leakage.

[0003] SUMMARY

[0004] In view of the above problems, the present application provides a pressure compensation valve, which can more accurately set the pressure difference, is more convenient to adjust, and can avoid oil leakage during adjustment.

[0005] In order to achieve the above technical purposes and achieve the above technical effects, the present application is realized by the following technical scheme:

[0006] A pressure compensation valve comprises:

[0007] A valve body is provided with an oil inlet, an oil outlet and a load feedback port;

[0008] A valve core hole is arranged in the valve body, and a first counterbore and a second counterbore are arranged in the axial direction of the valve core hole; the first counterbore is also in communication with the oil inlet; and the second counterbore is also in communication with the oil outlet;

[0009] An end cover is connected with the valve body and covers both ends of the valve core hole;

[0010] A valve rod is arranged in the valve core hole;

[0011] A spring sleeve is arranged in the valve core hole, and an annular groove in communication with the load feedback port is arranged on the outer wall of the spring sleeve;

[0012] A spring is arranged in the spring sleeve and in contact with the end of the valve rod;

[0013] A pilot overflow valve is in communication with the spring sleeve through a first oil port;

[0014] A first oil channel is arranged in the valve rod and used to introduce oil to the end of the valve core hole away from the spring, so as to generate oil pressure to push the valve rod and compress the spring;

[0015] A second oil channel is in communication with the first counterbore and the first oil port of the pilot overflow valve, respectively, and used to introduce oil to the first oil port of the pilot overflow valve;

[0016] A third oil passage is in communication with the second oil port of the pilot overflow valve and the annular groove on the spring sleeve.

[0017] Optionally, the first oil passage comprises:

[0018] A first sub-oil passage is arranged along the axial direction of the valve rod;

[0019] A second sub-oil passage is in communication with the first sub-oil passage and the second counterbore, and an angle is formed between the first sub-oil passage and the second sub-oil passage.

[0020] Optionally, the first port of the first sub-oil passage is in communication with the valve core hole, and a blocking piece is arranged at the second port of the spring.

[0021] Optionally, the valve rod comprises a first rod body, a second rod body and a third rod body arranged in sequence;

[0022] The first rod body and the third rod body are in clearance fit with the valve core hole, and the diameters of the first rod body and the third rod body are greater than the diameter of the second rod body;

[0023] A throttling groove is arranged on the end of the first rod body close to the second rod body;

[0024] The third rod body is also in contact with the spring.

[0025] Optionally, the number of the end covers is two, which are respectively a first end cover and a second end cover, and the first end cover and the second end cover are arranged oppositely and are both connected with the valve body and are used for covering two ends of the valve core hole.

[0026] Optionally, the spring sleeve comprises a first part and a second part connected in sequence, the first part is arranged in the valve core hole, and the second part is arranged in the second end cover.

[0027] Optionally, a sealing ring is arranged between the spring sleeve and the valve core hole and the second end cover.

[0028] Optionally, the pressure compensation valve further comprises a spring seat, the spring seat is arranged in the second end cover and is in contact with the end of the spring away from the valve rod.

[0029] Optionally, the pressure compensation valve further comprises a first throttling plug, and the first throttling plug is arranged in the second oil passage.

[0030] Optionally, the pressure compensation valve further comprises a second throttling plug, and the second throttling plug is arranged in the connecting channel between the first oil port of the pilot overflow valve and the spring sleeve.

[0031] Compared with the prior art, the pressure compensation valve has the following beneficial effects:

[0032] The application adopts the combination mode of the compensation valve and the pilot overflow valve, the inlet oil pressure of the compensation valve is introduced into the oil inlet of the pilot overflow valve (i.e. the first oil port of the pilot overflow valve), the LS feedback oil pressure at the load feedback port is introduced into the oil outlet of the pilot overflow valve (i.e. the second oil port of the pilot overflow valve), the LS feedback oil pressure is superimposed on the compensation valve inlet oil pressure according to 1:1, and the superimposed pressure enters the compensation valve spring cavity composed of a spring and a spring sleeve. When the pressure of the pilot overflow valve is adjusted, the adjustment pressure difference of the compensation valve is changed, the structure makes the pressure adjustment of the compensation valve more convenient, the compensation valve pressure difference setting is more accurate, and the oil leakage risk in the adjustment process is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0034] Fig. 1 is a structural schematic view of a pressure compensation valve according to an embodiment of the present application;

[0035] Wherein: 1-valve body, 2-valve rod, 201-first section of the rod body, 202-second section of the rod body, 203-third section of the rod body, 3-spring, 4-pilot overflow valve, 5-spring sleeve, 6-first end cover, 7-second end cover, 8-bolt, 9-spring seat, 10-first throttling plug, 11-second throttling plug, 12-first counterbore, 13-second counterbore, 14-throttling groove, 15-sealing ring, 16-plugging element, 17-first oil channel, 1701-first sub-oil channel, 1702-second sub-oil channel, 18-second oil channel, 19-third oil channel, 20-valve core hole. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0037] The application is not limited by the relative positioning of parts and steps, the numerical expressions, and the numerical values set forth in the examples unless otherwise specifically stated. It is to be understood that the dimensions of the various parts shown in the drawings are not drawn to scale for the sake of convenience in description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the description of the application. In all examples shown and discussed herein, any specific value is to be interpreted as merely an example, and not a limitation. Thus, other examples of the example embodiments can include different values. It is noted that like numbers and letters refer to like elements throughout the several views of the drawings, and thus, once an element is defined in one drawing, it is not necessary to discuss it further in subsequent drawings.

[0038] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0039] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0040] The application principle of the present application will be described in detail below in combination with the drawings.

[0041] As shown in FIG. 1, a pressure compensation valve is provided in the present application, comprising a valve body 1, a valve core hole 20, an end cover, a valve rod 2, a spring sleeve 5, a spring 3, a pilot overflow valve 4, a first oil passage 17, a second oil passage 18 and a third oil passage 19;

[0042] The valve body 1 is provided with an oil inlet (i.e. P port in FIG. 1), an oil outlet (i.e. P1 port in FIG. 1) and a load feedback port (i.e. LS port in FIG. 1);

[0043] The valve core hole 20 is arranged inside the valve body 1, and first and second counterbores 12 and 13 are arranged in the axial direction of the valve core hole 20 and communicate with the valve core hole 20; the first counterbores 12 also communicate with the oil inlet; and the second counterbores 13 also communicate with the oil outlet;

[0044] The end cover is connected with the valve body 1 and covers both ends of the valve core hole 20; in a specific implementation, the end cover is connected with the valve body 1 through bolts 8;

[0045] The valve rod 2 is arranged in the valve core hole 20, and the axial length of the valve rod 2 is less than the axial length of the valve core hole 20;

[0046] The spring sleeve 5 is arranged in the valve core hole 20, and an annular groove for communicating with a load feedback port is arranged on the outer wall of the spring sleeve 5;

[0047] The spring 3 is arranged in the spring sleeve 5 and contacts the end of the valve rod 2, and in the hydraulic control adjustment process, the spring 3 is pushed by the valve rod 2 to perform extension and contraction movement; the spring 3 and the spring sleeve 5 jointly constitute a compensation valve spring cavity;

[0048] The first oil port of the pilot overflow valve 4 communicates with the spring sleeve 5;

[0049] The first oil channel 17 is arranged inside the valve rod 2 and is used for introducing oil to the end of the valve core hole 20 away from the spring 3 to generate oil pressure to push the valve rod 2 to compress the spring 3 to move to the right;

[0050] The second oil channel 18 respectively communicates with the first counterbores 12 and the first oil port of the pilot overflow valve 4 and is used for introducing oil to the first oil port of the pilot overflow valve 4;

[0051] The third oil channel 19 respectively communicates with the second oil port of the pilot overflow valve 4 and the annular groove on the spring sleeve 5.

[0052] In a specific embodiment of the present application, as shown in FIG. 1, in order to introduce oil at the oil inlet into the first oil channel 17, the first oil channel 17 includes a first sub-oil channel 1701 and a second sub-oil channel 1702;

[0053] The first sub-oil channel 1701 is arranged along the axial direction of the valve rod 2;

[0054] The second sub-oil channel 1702 respectively communicates with the first sub-oil channel 1701 and the second counterbores 13 and has an included angle with the first sub-oil channel 1701;

[0055] The first port of the first sub-oil passage 1701 is communicated with the valve core hole 20, and a blocking piece 16 is arranged at the second port of the spring 3, so as to separate the oil in the first oil passage 17 from the oil in the spring sleeve 5; preferably, the second sub-oil passage 1702 is perpendicular to the first sub-oil passage 1701.

[0056] When the oil enters the first counterbore 12 through the oil inlet (P port in FIG. 1), a part of the oil is sent into the valve core hole 20 and the second counterbore 13, and finally into the oil outlet (P1 port); another part of the oil enters the second sub-oil passage 1702 in the valve rod 2, then enters the first sub-oil passage 1701 communicated with the second sub-oil passage 1702, and then enters the end of the valve core hole 20 away from the spring 3, so as to push the valve rod 2 to compress the spring 3.

[0057] In an embodiment of the present application, as shown in FIG. 1, the valve rod 2 comprises a first rod body 201, a second rod body 202 and a third rod body 203 arranged in sequence.

[0058] The first rod body 201 and the third rod body 203 are in clearance fit with the valve core hole 20, and the diameters of the first rod body 201 and the third rod body 203 are greater than the diameter of the second rod body 202.

[0059] A throttling groove 14 is arranged on the end of the first rod body 201 close to the second rod body 202, so as to guide the oil in the first counterbore 12 into the valve core hole 20 when the valve rod 2 moves and the first counterbore 12 cannot be communicated with the valve core hole 20, and then the oil enters the second counterbore 13 and is sent into the oil outlet (P1 port in FIG. 1).

[0060] The third rod body 203 is in contact with the spring 3.

[0061] In an embodiment of the present application, as shown in FIG. 1, the number of the end covers is 2, which are respectively a first end cover 6 and a second end cover 7, and the first end cover 6 and the second end cover 7 are oppositely arranged and connected with the valve body 1, and are respectively used for covering two ends of the valve core hole 20.

[0062] In an embodiment of the present application, as shown in FIG. 1, the spring sleeve 5 comprises a first part and a second part connected in sequence, the first part is arranged in the valve core hole 20, and the second part is arranged in the second end cover 7.

[0063] In an embodiment of the present application, as shown in FIG. 1, in order to realize no leakage in the adjustment process, the spring sleeve 5 is provided with a sealing ring 15 between the valve core hole 20 and the second end cover 7.

[0064] In one specific embodiment of the present application, as shown in Figure 1, the pressure compensation valve further comprises a spring seat 9 for spring positioning, which is arranged in the second end cover 7 and in contact with the end of the compensation spring 3 away from the valve stem 2.

[0065] In one specific embodiment of the present application, as shown in Figure 1, the pressure compensation valve further comprises a first throttling plug 10, which is arranged in the second oil channel 18. The first throttling plug 10 is used to generate a pressure difference.

[0066] In one specific embodiment of the present application, as shown in Figure 1, the pressure compensation valve further comprises a second throttling plug 11 for generating a pressure difference, which is arranged in the connecting channel between the first oil port of the pilot overflow valve 4 and the spring sleeve 5.

[0067] The working principle of the pressure compensation valve in the present application is as follows:

[0068] After entering the pressure compensation valve in the present application through the oil inlet port P, part of the oil enters the oil outlet port P1 through the first counterbore 12, the valve core hole 20 and the second counterbore 13, or enters the oil outlet port P1 through the throttling groove 14 on the valve stem 2; part of the oil enters the end of the valve core hole 20 away from the spring 3 through the first oil channel 17 in the valve stem 2, pushing the valve stem 2 to move to the right. Part of the oil flows through the first throttling plug 10 through the first counterbore 12 and the first oil channel 17, enters the first oil port (i.e. the oil inlet port) of the pilot overflow valve 4, and at the same time enters the compensation valve spring 3 cavity formed by the spring sleeve 5 and the spring 3. The load feedback port (LS port) receives the pressure signal fed back by the load, flows through the annular groove on the spring sleeve 5, and enters the second oil port (oil outlet port) of the pilot overflow valve 4. Since the pressure at the second oil port of the pilot overflow valve 4 directly acts on the first oil port of the pilot overflow valve 4 at a ratio of 1:1, the inlet pressure of the pilot overflow valve 4 is the set pressure of the pilot overflow valve plus the pressure fed back by the load feedback port. The pressure difference of the pressure compensation valve (the difference between the inlet pressure P of the pressure compensation valve and the outlet pressure P1) is set to the spring force generated by the spring 3 plus the inlet pressure of the pilot overflow valve 4, and remains in dynamic balance. When adjusting the set pressure of the pilot overflow valve 4, the inlet pressure of the pilot overflow valve 4 will change, thereby realizing the adjustability of the pressure difference of the pressure compensation valve. During the adjustment of the pilot overflow valve 4, the pilot overflow valve 4 has no leakage and is adjusted by the pilot pressure, so the adjustment process is convenient, fast and accurate.

[0069] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the protection scope of the present application.

[0070] The basic principles and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A pressure compensated valve, characterized in that, The pressure compensation valve comprises: a valve body provided with an oil inlet, an oil outlet and a load feedback port; a valve core hole arranged in the valve body, the valve core hole being provided with a first counterbore and a second counterbore in the axial direction, the first counterbore being further communicated with the oil inlet, and the second counterbore being further communicated with the oil outlet; an end cover connected with the valve body and used for covering two ends of the valve core hole; a valve rod arranged in the valve core hole; a spring sleeve arranged in the valve core hole, an annular groove being arranged on the outer wall of the spring sleeve and communicated with the load feedback port; a spring arranged in the spring sleeve and in contact with the end of the valve rod; a pilot overflow valve, a first oil port of the pilot overflow valve being communicated with the spring sleeve; a first oil channel arranged in the valve rod and used for introducing oil to the end of the valve core hole away from the spring to generate oil pressure to push the valve rod and compress the spring; a second oil channel communicated with the first counterbore and the first oil port of the pilot overflow valve respectively and used for introducing oil to the first oil port of the pilot overflow valve; a third oil channel communicated with the second oil port of the pilot overflow valve and the annular groove on the spring sleeve respectively.

2. A pressure compensated valve according to claim 1, characterized in that The first oil channel comprises: a first sub-oil channel arranged along the axial direction of the valve rod; a second sub-oil channel communicated with the first sub-oil channel and the second counterbore respectively and having an included angle with the first sub-oil channel.

3. A pressure compensated valve according to claim 2, characterised in that The first port of the first sub-oil channel is communicated with the valve core hole, and a blocking piece is arranged at the second port of the first sub-oil channel close to the spring.

4. A pressure compensated valve according to claim 1, characterized in that: The valve rod comprises a first rod body, a second rod body and a third rod body arranged in sequence; the first rod body and the third rod body are in clearance fit with the valve core hole, and the diameters of the first rod body and the third rod body are greater than the diameter of the second rod body; a throttling groove is arranged on the end of the first rod body close to the second rod body; the third rod body is further in contact with the spring.

5. A pressure compensated valve according to claim 1, wherein, The number of the end cover is two, which are respectively a first end cover and a second end cover, the first end cover and the second end cover are oppositely arranged and connected with the valve body and used for covering two ends of the valve core hole respectively.

6. A pressure compensated valve according to claim 5, characterised in that: The spring sleeve comprises a first part and a second part arranged in sequence, the first part is arranged in the valve core hole, and the second part is arranged in the second end cover.

7. A pressure compensated valve according to claim 6, characterised in that: A sealing ring is arranged between the spring sleeve and the valve core hole and the second end cover.

8. A pressure compensated valve according to claim 5, characterized in that: The pressure compensation valve further comprises a spring seat, the spring seat is arranged in the second end cover and in contact with the end of the spring away from the valve rod.

9. A pressure compensated valve according to claim 1, wherein, The pressure compensation valve further comprises a first throttling plug, the first throttling plug is arranged in the second oil channel.

10. A pressure compensated valve according to claim 1, wherein, The pressure compensation valve further comprises a second throttling plug, the second throttling plug is arranged in the connecting channel between the first oil port of the pilot overflow valve and the spring sleeve.

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