Differential valve element assembly

Abstract

The utility model discloses a differential valve element assembly which comprises a thread sleeve, a liquid inlet valve sleeve connected with the thread sleeve, a valve rod movably arranged in the liquid inlet valve sleeve, a valve element and a differential pressure sleeve which are movably arranged in the thread sleeve, and a valve pad which is arranged in the liquid inlet valve sleeve and used for making contact with the valve element. The valve rod is connected with the differential pressure sleeve, and the valve rod and the differential pressure sleeve move synchronously. According to the differential valve element assembly, the valve element and the valve pad are in soft sealing, and the sealing performance can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine fully mechanized mining hydraulic supports, and in particular, the utility model relates to a differential valve core component. Background Art

[0002] Differential valves are needed in coal mine hydraulic supports. The existing differential valves have hard seals between the valve core and the valve seat. The sealing performance of the hard seal is poor, and the probability of differential valve leakage is high. This is mainly because the hard seal relies on precise machining accuracy and matching accuracy, as well as a certain clamping force to achieve sealing. If the machining accuracy or matching accuracy is insufficient, or the clamping force is insufficient, the seal may fail.

[0003] A Chinese patent with application number 202410083220.9 discloses a hydraulically controlled one-way valve assembly and a differential two-way lock. The hydraulically controlled one-way valve assembly includes a valve core assembly and a screw sleeve. The screw sleeve is a cylindrical structure with openings at both ends. A valve seat is arranged at the first end of the screw sleeve, and a liquid inlet hole is arranged on the valve seat. The valve core assembly reciprocates in the screw sleeve. A partition is arranged in the screw sleeve. The interior of the screw sleeve is divided into a first chamber and a second chamber through the partition. The valve core assembly includes a push rod. A guide sleeve, a valve core and a pressing sleeve are arranged on the push rod. A liquid inlet is arranged on the guide sleeve, and the liquid inlet is connected to the liquid inlet hole. A liquid outlet is arranged on the screw sleeve, and the liquid outlet is connected to the first chamber. The push rod extends into the first chamber from the first end of the screw sleeve, and a screw plug is arranged at the second end of the screw sleeve to close the second chamber.

[0004] It is desirable to provide an improved differential valve core assembly, particularly with respect to improving the sealing performance of the differential valve. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a differential valve core assembly, the purpose of which is to improve the sealing performance.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a differential valve core assembly, including a screw sleeve, a liquid inlet valve sleeve connected to the screw sleeve, a valve stem movably arranged in the liquid inlet valve sleeve, a valve core and a differential pressure sleeve movably arranged in the screw sleeve, and a valve pad arranged in the liquid inlet valve sleeve and used for contacting the valve core, the valve pad is made of soft material, the valve stem is connected to the differential pressure sleeve and the valve stem and the differential pressure sleeve move synchronously.

[0007] The valve pad is made of polyetheretherketone plastic.

[0008] A first spring for applying an elastic force to the valve stem is arranged in the liquid inlet valve sleeve.

[0009] A second spring for applying an elastic force to the valve core is arranged in the screw sleeve.

[0010] The valve stem is provided with a limiting mechanism for axially limiting the differential pressure sleeve, and the second spring is clamped between the limiting mechanism and the valve core.

[0011] The limiting mechanism comprises a washer and a locking nut sleeved on the valve stem, the differential pressure sleeve is located between the locking nut and the washer, and the second spring is clamped between the washer and the valve core.

[0012] The locking nut is threadedly connected to the valve stem.

[0013] A liquid hole is arranged on the end surface or the side wall of the screw sleeve.

[0014] The differential valve core assembly of the utility model has a soft seal between the valve core and the valve pad, which can improve the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] This specification includes the following drawings, which show the following contents:

[0016] Figure 1 is a cross-sectional view of the differential valve core assembly of the first embodiment;

[0017] Figure 2 is a cross-sectional view of the differential valve core assembly of the second embodiment;

[0018] Figure 3 is a side view of the locking nut;

[0019] The markings in the figure are: 1. threaded sleeve; 2. differential pressure sleeve; 3. gasket; 4. second spring; 5. valve core; 6. valve pad; 7. liquid inlet valve sleeve; 8. first spring; 9. valve stem; 10. locking nut. DETAILED DESCRIPTION

[0020] The specific implementation methods of the utility model are further explained in detail below with reference to the accompanying drawings through the description of embodiments, with the aim of helping technicians in the field to have a more complete, accurate and in-depth understanding of the concept and technical solution of the utility model and facilitating its implementation.

[0021] It should be noted that, in the following embodiments, the “first” and “second” mentioned do not represent an absolute distinction in structure and / or function, nor do they represent a sequential order of execution, but are merely for the convenience of description.

[0022] Embodiment 1

[0023] like Figure 1As shown, this embodiment provides a differential valve core assembly, including a screw sleeve 1, a liquid inlet valve sleeve 7 connected to the screw sleeve 1, a valve stem 9 movably disposed in the liquid inlet valve sleeve 7, a valve core 5 and a differential pressure sleeve 2 movably disposed in the screw sleeve 1, and a valve pad 6 disposed in the liquid inlet valve sleeve 7 and used to contact the valve core 5, the valve pad 6 is made of soft material, the valve stem 9 is connected to the differential pressure sleeve 2 and the valve stem 9 and the differential pressure sleeve 2 move synchronously. The valve core 5 is made of metal, and there is a soft seal between the valve core 5 and the valve pad 6, which can improve the sealing performance.

[0024] like Figure 1 As shown, the head of the valve core 5 is a frustum structure, and a sealing surface in contact with the valve pad 6 is provided on the valve core 5. The sealing surface is a conical surface, and the sealing performance of the component is good, and the structure of the valve core 5 is simpler. The valve pad 6 is a circular ring structure, and the valve pad 6 is fixedly arranged between the liquid inlet valve sleeve 7 and the screw sleeve 1. The valve pad 6 is made of polyetheretherketone plastic.

[0025] like Figure 1 As shown, the liquid inlet valve sleeve 7 is a cylindrical structure with openings at both ends and a hollow interior, and a first spring 8 for applying an elastic force to the valve stem 9 is arranged in the liquid inlet valve sleeve 7. The first spring 8 is a cylindrical helical spring and a compression spring, and the first spring 8 is located in the inner cavity of the liquid inlet valve sleeve 7. The first spring 8 is sandwiched between a limiting surface on the valve stem 9 and a limiting surface arranged in the inner cavity of the liquid inlet valve sleeve 7, and the first spring 8 applies an elastic force to the valve stem 9 to make it move axially toward a position away from the screw sleeve 1.

[0026] like Figure 1 As shown, the screw sleeve 1 is a cylindrical structure with one end open, the other end closed and the interior hollow. The screw sleeve 1 is coaxially arranged with the liquid inlet valve sleeve 7, the valve stem 9, the valve core 5 and the valve pad 6. One end of the screw sleeve 1 is threadedly connected with one end of the liquid inlet valve sleeve 7. A second spring 4 for applying elastic force to the valve core 5 is arranged in the screw sleeve 1. The second spring 4 is a cylindrical helical spring and a compression spring. The second spring 4 is located in the inner cavity of the screw sleeve 1. The second spring 4 applies elastic force to the valve core 5 to make it move axially toward the position close to the valve pad 6, so that the valve core 5 and the valve pad 6 can maintain a contact state to achieve sealing.

[0027] like Figure 1 As shown, the valve core 5 is a cylindrical structure with openings at both ends and a hollow interior. The valve stem 9 passes through the first spring 8, the valve pad 6, the valve core 5 and the second spring 4 in sequence. The valve stem 9 is an integrated structure. The valve stem 9 is made of metal. The valve pad 6 is located between the valve core 5 and the first spring 8.

[0028] like Figure 1As shown, a limiting mechanism for axially limiting the differential pressure sleeve 2 is provided on the valve stem 9. The limiting mechanism includes a washer 3 and a locking nut 10 sleeved on the valve stem 9, the differential pressure sleeve 2 is located between the locking nut 10 and the washer 3, and the second spring 4 is clamped between the washer 3 and the valve core 5.

[0029] like Figure 1 As shown, the differential pressure sleeve 2 is a cylindrical structure with openings at both ends and a hollow interior, and a sealing ring is arranged between the outer circumference of the differential pressure sleeve 2 and the inner circumference of the screw sleeve 1. The inner cavity of the screw sleeve 1 includes a large diameter cavity and a small diameter cavity, and the large diameter cavity and the small diameter cavity are two circular cavities, and the large diameter cavity and the small diameter cavity are coaxially arranged and connected, and the diameter of the large diameter cavity is larger than the diameter of the small diameter cavity, the valve core 5, the second spring 4 and the gasket 3 are located in the large diameter cavity, and the differential pressure sleeve 2 is located in the small diameter cavity, and the outer diameter of the gasket 3 is larger than the diameter of the small diameter cavity.

[0030] like Figure 1 As shown, the locking nut 10 is threadedly connected to the valve stem 9 , a threaded hole is arranged on the locking nut 10 , and an external thread is arranged at the end of the valve stem 9 . The locking nut 10 locks and fixes the differential pressure sleeve 2 on the valve stem 9 .

[0031] like Figure 3 As shown, the outer surface of the locking nut 10 includes an outer cylindrical surface and a screwing surface. Two outer cylindrical surfaces and screwing surfaces are provided. The outer cylindrical surface is an arc surface. The two outer cylindrical surfaces are symmetrically arranged. The axis of the locking nut 10 is located between the two outer cylindrical surfaces. The two screwing surfaces are symmetrically arranged. The axis of the locking nut 10 is also located between the two screwing surfaces. The screwing surface is a plane parallel to the axis of the locking nut 10. The two screwing surfaces are parallel. The two ends of the two screwing surfaces are respectively connected to the two ends of the two outer cylindrical surfaces. The distance between the two screwing surfaces is smaller than the diameter of the outer cylindrical surface. The diameter of the outer cylindrical surface is smaller than the diameter of the small-diameter cavity. The two screwing surfaces are used to cooperate with tools such as wrenches during disassembly and assembly to facilitate screwing of the locking nut 10.

[0032] like Figure 1 As shown, a liquid hole is provided on the annular side wall of the screw sleeve 1, and the liquid hole is radially penetrated on the annular side wall of the screw sleeve 1, and the liquid hole is connected with the inner cavity of the screw sleeve 1, and the axis of the liquid hole is perpendicular to the axis of the screw sleeve 1. When the valve core 5 contacts the valve pad 6, the differential pressure sleeve 2 is located between the liquid hole and the valve core 5.

[0033] Embodiment 2

[0034] like Figure 2 As shown, the difference between the differential valve core assembly provided in this embodiment and that in the first embodiment mainly lies in the different setting positions of the liquid hole on the screw sleeve 1. In this embodiment, the liquid hole is set on the closed end face of the screw sleeve 1, and the liquid hole is axially penetrated through the end of the screw sleeve 1. The liquid hole is connected to the inner cavity of the screw sleeve 1, and the axis of the liquid hole is in the same straight line as the axis of the screw sleeve 1.

[0035] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A differential valve core assembly, characterized in that: It includes a screw sleeve, a liquid inlet valve sleeve connected to the screw sleeve, a valve stem movably arranged in the liquid inlet valve sleeve, a valve core and a differential pressure sleeve movably arranged in the screw sleeve, and a valve pad arranged in the liquid inlet valve sleeve and used for contacting the valve core. The valve pad is made of soft material, the valve stem is connected to the differential pressure sleeve and the valve stem and the differential pressure sleeve move synchronously.

2. The differential valve core assembly according to claim 1, characterized in that: The valve pad is made of polyetheretherketone plastic.

3. The differential valve core assembly according to claim 1, characterized in that: A first spring for applying an elastic force to the valve stem is arranged in the liquid inlet valve sleeve.

4. The differential valve core assembly according to any one of claims 1 to 3, characterized in that: A second spring for applying an elastic force to the valve core is arranged in the screw sleeve.

5. The differential valve core assembly according to claim 4, characterized in that: The valve stem is provided with a limiting mechanism for axially limiting the differential pressure sleeve, and the second spring is clamped between the limiting mechanism and the valve core.

6. The differential valve core assembly according to claim 5, characterized in that: The limiting mechanism comprises a washer and a locking nut sleeved on the valve stem, the differential pressure sleeve is located between the locking nut and the washer, and the second spring is clamped between the washer and the valve core.

7. The differential valve core assembly according to claim 6, characterized in that: The locking nut is threadedly connected to the valve stem.

8. The differential valve core assembly according to any one of claims 1 to 3, characterized in that: A liquid hole is arranged on the end surface or the side wall of the screw sleeve.

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