Novel valve seat, valve group, coring drilling tool and SDB two-stage single-acting semi-closed pipe drilling tool

Abstract

The utility model relates to a novel valve seat which comprises a valve body and a connector, the valve body is designed to be cylindrical, a flow channel used for installing a valve element is arranged in the valve body, the first end of the valve body is connected with the connector, the front end of the valve element is movably inserted into an inner cavity of the connector in a penetrating mode, a spring is installed in the flow channel, and the first end of the valve body is connected with the connector. One end of the spring is screwed into a spring barrel at the rear end of the valve element, a step table is arranged in the flow channel, the spring barrel and the step table are matched and limited, the other end of the spring is connected with the second end of the valve body, and the second end and the side wall of the valve body are provided with a main discharge hole and a secondary discharge hole respectively, a protrusion is arranged on the outer wall of the rear end of the valve element, and a limiting groove is formed in the position, corresponding to the protrusion, of the inner wall of the flow channel. While mortar blockage is prevented, the protrusions on the outer wall of the valve element are movably clamped in the limiting grooves, the situation that the valve element rotates and swings when being scoured by mud in an unstable flocculating flow state, and consequently the spring is screwed is avoided, and it is guaranteed that the service life of the spring reaches the standard.

Description

Technical Field

[0001] The utility model relates to the technical field of geological drilling equipment, in particular to a novel valve seat, a valve group, a coring drill and an SDB two-stage single-action semi-closed tube drill. Background Art

[0002] A coring drill is a special drill used to hold and protect rock cores during geological drilling. When using this type of drill in sandy and gravel formations or broken formations, especially when drilling in sand layers, the valve seat of the coring drill is blocked due to poor sand discharge, which causes sand to precipitate and accumulate in the valve seat and valve group. The applicant has applied for an application number of 202122213374.X, a valve seat, a valve group, a coring drill and an SDB two-stage single-action semi-closed tube drill. It mainly relies on the discharge hole opened on the valve seat to discharge mortar, and the spring is used to cooperate with the valve core to open and close the channel. In actual use, it was found that the valve core is prone to rotation and swing when it is washed by mortar, causing the spring to twist, which will reduce the service life of the spring. The original spring was spot-welded directly to the valve core. The reliability requirements of the welding point are high. Over time, the welding point is prone to fatigue fracture, resulting in the spring being unable to exert normal spring stress on the valve core. These two points need to be improved. Utility Model Content

[0003] Based on this, it is necessary to provide a new type of valve seat, valve group, coring drill and SDB two-stage single-action semi-closed tube drill to address the above problems.

[0004] A new valve seat includes a valve body and a connecting head. The valve body is designed to be cylindrical. A flow channel for installing a valve core is provided in the valve body. The first end of the valve body is connected to the connecting head. The front end of the valve core is movably inserted into the inner cavity of the connecting head. A spring is installed in the flow channel. One end of the spring is screwed into the spring cylinder at the rear end of the valve core. A step is provided in the flow channel. The spring cylinder and the step match and limit the position. The other end of the spring is connected to the second end of the valve body. The second end and side wall of the valve body are respectively provided with a main discharge hole and a secondary discharge hole connected to the flow channel. The rear end outer wall of the valve core has a protrusion, and the inner wall of the flow channel is provided with a limiting groove corresponding to the protrusion.

[0005] Preferably, the secondary discharge hole is arranged obliquely toward the second end of the valve body.

[0006] Preferably, the diameters of the primary discharge holes and the secondary discharge holes are 4-8 mm.

[0007] Preferably, the connector is designed as a nut, and an outer circumference of the connector is provided with an external thread.

[0008] Preferably, the end surface of the connector is provided with a flow port, and the flow port is communicated with the inner cavity.

[0009] A valve group includes the new valve seat and valve cover described in any of the above items; the valve cover is detachably connected to the valve body through a connecting head, and a channel is opened in the valve cover to cooperate with the inner cavity and flow channel, and the channel, inner cavity and flow channel are coaxially arranged.

[0010] Preferably, a conical portion is provided at the front end of the valve core, and the conical portion is movably inserted into the channel, and the port of the channel is matched with the conical portion and is designed to be trumpet-shaped.

[0011] A coring drill tool comprises a first drill tool body; the valve group described in any one of the above items is arranged in the first drill tool body.

[0012] The SDB two-stage single-action semi-closed tube drilling tool comprises a second drilling tool body; the second drilling tool body is provided with any of the above-mentioned valve groups; the second drilling tool body has a semi-closed tube, and the second drilling tool body is configured as a two-stage single-action type.

[0013] The benefit of the present invention lies in that: by applying the present technical solution, the mortar (mud) pushes the valve core to overcome the spring force of the spring, the valve core opens the channel, and the mortar immediately enters the flow channel and can be quickly discharged outward from the main discharge hole and the secondary discharge hole. Even if the coring drill is used for a long time, since the mortar is discharged smoothly and reliably, the sand particles in the mortar are difficult to remain in the flow channel and settle and block the flow channel to affect the normal operation of the valve core. Even if there are residual sand particles, the mortar will wash away the sand particles during the flow, avoiding blockage. In addition, when the mortar passes through the flow channel during flow, a part of the flow path is basically a straight line, which can flow out quickly. The fast flow rate can wash the inner wall of the flow channel to effectively prevent the deposition of sand particles and prevent sand accumulation, and the sand discharge effect is good. The coring drill can be used for a long time, the maintenance cycle is extended, and the cost of use is greatly controlled. When the mortar flushes the valve core, the protrusion on the outer wall of the valve core is movably engaged in the limit groove, preventing the valve core from rotating when flushed by unstable flocculation mud, causing the spring to twist, thereby ensuring that the service life of the spring meets the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the assembly structure of the new valve seat and valve group;

[0015] Figure 2 Schematic diagram of the core drilling tool structure. DETAILED DESCRIPTION

[0016] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0017] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] Example 1

[0020] like Figure 1 As shown, the new valve seat includes a valve body 1 and a connector 2. The valve body 1 is designed to be cylindrical. A flow channel 11 for installing a valve core 3 is provided in the valve body 1. The first end of the valve body 1 is connected to the connector 2. The front end of the valve core 3 is movably inserted into the inner cavity 21 of the connector 2. A spring 4 is installed in the flow channel 11. One end of the spring 4 is screwed into the spring cylinder 31 at the rear end of the valve core 3. A step platform 12 is provided in the flow channel 11. The spring cylinder 31 and the step platform 12 are matched and limited. The other end of the spring 4 is connected to the second end of the valve body 1. The second end and side wall of the valve body 2 are respectively provided with a main discharge hole 13 and a secondary discharge hole 14 communicating with the flow channel 11. The rear end outer wall of the valve core 3 has a protrusion 32, and the inner wall of the flow channel 11 is provided with a limiting groove 15 corresponding to the protrusion 32. Specifically,

[0021] The secondary discharge hole 14 is inclined toward the second end of the valve body 2. Compared with the flat discharge designed previously, the inclined setting has lower resistance to the discharged mortar and smoother circulation.

[0022] Specifically, the diameters of the primary discharge hole 13 and the secondary discharge hole are 4-8 mm.

[0023] Specifically, the connector 2 is designed as a nut, and an outer circumference of the connector 2 is provided with an external thread, and a detachable threaded connection design is realized through the connector 2.

[0024] Specifically, the end surface of the connector 2 is provided with a flow opening 22, which is in communication with the inner cavity 21. The flow openings 21 are evenly spaced around the central axis of the connector 2 and are used to connect the inner cavity 21 with the outside.

[0025] Example 2

[0026] Based on the technical solution of the above-mentioned embodiment 1, a specific application of a new valve seat is provided.

[0027] like Figure 1 As shown, the valve assembly includes the novel valve seat described in Example 1 and a valve cover 5; the valve cover 5 is detachably connected to the valve body 1 via a connector 2. A channel 51 is defined within the valve cover 5 to mate with the inner cavity 21 and flow channel 11. The channel 51 is coaxially arranged with the inner cavity 21 and flow channel 11. Specifically, the valve cover 5 matches the connector 2 and is cylindrical in shape with a threaded structure on the inside. The connector 2 and the valve cover 5 can be screwed together to form a single piece, so that the channel 51 inside the valve cover 5, the inner cavity 21, and the flow channel 11 are coaxially connected, making assembly extremely convenient.

[0028] like Figure 1 As shown, this embodiment further improves the valve assembly. The front end of the valve core 3 is provided with a conical portion 33, which is movably inserted into the channel 51. The end of the channel 51 is designed to match the conical portion 33 and is shaped like a trumpet. Specifically, the cross-section of the tip of the conical portion 33 is much smaller than the diameter of the channel 51. This makes it easier for the valve core 3 to be inserted into the channel 51 under the action of the spring 4, avoiding collision with the end of the channel 51. The end of the channel 51 is shaped like a trumpet, matching the conical portion 33, to prevent scratching during insertion.

[0029] Example 3

[0030] Based on the technical solution of the above-mentioned embodiment 2, a specific application of the above-mentioned valve group is provided.

[0031] like Figure 2 As shown, the coring drill tool includes a first drill tool body; the valve group as described in Example 2 is arranged in the first drill tool body.

[0032] Specifically, the first drill tool body is threadedly connected to the valve assembly via threads. The first drill tool body includes an outer tube 6, two sections of which are connected via an outer tube connector 61. The outer tube connector 61 is threadedly connected to the valve assembly. In the valve assembly, the new valve seat is positioned toward the drill bit of the first drill tool body. A portion of the outer tube connector 61 is connected to the outer tube 6, further enabling docking; a portion of the valve assembly extends into the outer tube 6.

[0033] The working conditions of this coring drill (also describes the working conditions of the valve seat and valve group):

[0034] During the drilling operation of the coring drill, mortar (mud) pushes against the valve core 3, overcoming the spring force of spring 4. The conical portion 33 of the valve core 3 is no longer engaged with the end of the passage 51. The mortar then enters the flow channel 11 and is quickly discharged outward through the primary discharge hole 13 and the secondary discharge hole 14. Even if the coring drill is used for a long time, the smooth and reliable discharge of the mortar makes it difficult for sand particles in the mortar to remain and settle in the flow channel 11, preventing blockage and affecting the normal operation of the valve core 3. Even if sand particles remain, they will be washed away by the flowing mortar, preventing clogging.

[0035] Beneficial effects:

[0036] As the mortar flows through the flow channel 11, a portion of the flow path is essentially straight, allowing it to flow out quickly. The high flow rate can flush the inner wall of the flow channel 11, effectively preventing sand deposition and accumulation, and achieving a good sand removal effect. The core drilling tool can be used for a long time, the maintenance cycle is shortened, and the cost of use is greatly reduced.

[0037] Example 4

[0038] Based on the technical solution of the above-mentioned embodiment 2, another specific application of the above-mentioned valve group is provided, and this specific application is a variation of the embodiment 3.

[0039] The coring drill tool of the third embodiment is further configured as a semi-closed tube type and a double-stage single-action type, and is formed into an SDB double-stage single-action semi-closed tube drill tool (also known as an SDB double-stage single-action semi-closed tube diamond drill tool).

[0040] Specifically, the SDB two-stage single-action semi-closed tube drill tool includes a second drill tool body; the second drill tool body is provided with a valve group as described in any one of the above items; the second drill tool body has a semi-closed tube, and the second drill tool body is set to a two-stage single-action form.

[0041] In the above description, the second drill body can be equivalent to the first drill body in Example 2, and the semi-closed tube can be equivalent to the outer tube 6 in Example 2. The second drill body has a diamond drill bit.

[0042] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. New valve seat, characterized by: The spool has a first end and a second end which are connected to the valve core, and a spring is installed in the spool, one end of the spring is screwed into the spring cylinder at the rear end of the spool, a step is provided in the spool, the spring cylinder and the step are matched to limit the position, and the other end of the spring is connected to the second end of the valve body, and a main discharge hole and a secondary discharge hole which are connected to the flow channel are respectively provided on the second end and the side wall of the valve body, the rear end outer wall of the spool has a protrusion, and the inner wall of the flow channel has a limiting groove corresponding to the protrusion.

2. The novel valve seat according to claim 1, characterized in that: The secondary discharge hole is arranged obliquely toward the second end of the valve body.

3. The novel valve seat according to claim 1, characterized in that: The apertures of the primary discharge hole and the secondary discharge hole are 4-8 mm.

4. The novel valve seat according to claim 1, characterized in that: The connecting head is designed as a nut, and an outer circumference of the connecting head is provided with an external thread.

5. The novel valve seat according to claim 4, characterized in that: The end surface of the connector is provided with a flow port, and the flow port is communicated with the inner cavity.

6. Valve group, characterized by: It includes the new valve seat and valve cover as described in any one of claims 1 to 5 above; the valve cover is detachably connected to the valve body through a connecting head, and a channel is opened in the valve cover to cooperate with the inner cavity and flow channel, and the channel, inner cavity and flow channel are coaxially arranged.

7. The valve assembly according to claim 6, wherein: The front end of the valve core is provided with a cone portion, the cone portion is movably inserted into the channel, and the port of the channel is matched with the cone portion and is designed to be trumpet-shaped.

8. A coring drill, comprising a first drill body; characterized in that: The first drilling tool body is provided with a valve group according to any one of claims 6 to 7.

9. SDB two-stage single-action semi-closed tube drilling tool, including a second drilling tool body; characterized by: The second drill tool body is provided with a valve group according to any one of claims 6 to 7; the second drill tool body has a semi-closed pipe, and the second drill tool body is configured as a two-stage single-action type.

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