A new type of check valve and impactor

Abstract

The present invention relates to a novel check valve and impactor, wherein the check valve comprises a valve body, and the valve body is provided with a sealing portion, a matching portion, an auxiliary matching portion, an inner cavity and an air passage; during operation, the sealing portion can cooperate with a matching surface provided on a rear joint to close the air passage; the matching portion and the inner cavity of the rear joint form a sliding fit, and enables the check valve to always slide back and forth along the central axis direction of the cavity during operation to achieve radial positioning; the auxiliary matching portion can cooperate with the inner cavity of the gas distribution rod of the gas distribution rod and play an auxiliary positioning role; the inner cavity cooperates with the end of a spring to accommodate the spring; the air passage is the check valve air passage, so that when the check valve is in an open state, compressed gas can be introduced into the interior of the impactor from this passage.

Description

Technical Field

[0001] The invention belongs to the field of rock drilling tools, and in particular relates to a novel check valve and an impactor. Background Art

[0002] Pneumatic impactor is a common rock drilling equipment. Unlike hydraulic rock drilling equipment, its power output and conversion components are always submerged in the bottom of the hole. As drilling deepens, the rock formation at the bottom of the hole changes, and it is often accompanied by complex working conditions such as mud and water mixing. Therefore, it is crucial to ensure the normal operation of the pneumatic impactor and prevent mud and water from flowing back into the impactor.

[0003] Figure 1 , Figure 2 The figures show a common impactor and check valve structure. The check valve is provided with a sealing portion b2 that matches the rear joint d, a positioning portion b1 that matches the gas distribution rod e for installation and positioning, and a matching portion b3 that matches the spring c. The matching between the sealing portion a of the check valve and the rear joint d in this structure is affected by the assembly coaxiality accuracy of the rear joint, gas distribution rod and other components and the disturbance during operation, resulting in sealing failure. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a new type of check valve and impactor. The check valve in the above structure has no interference in its axial reciprocating motion with other components except the impactor rear joint, and can always maintain effective sealing cooperation with the rear joint.

[0005] In order to realize the above-mentioned technical features, the purpose of the present invention is achieved as follows:

[0006] A novel check valve, comprising a valve body, on which a sealing portion, a matching portion, an auxiliary matching portion, an inner cavity and an air passage are arranged; during operation, the sealing portion can cooperate with a matching surface arranged on a rear joint to close the air passage;

[0007] The matching portion forms a sliding match with the inner cavity of the rear joint, and enables the check valve to always slide back and forth along the central axis of the cavity when working, so as to achieve radial positioning;

[0008] The auxiliary matching portion can match with the inner cavity of the gas distribution rod of the gas distribution rod and play an auxiliary positioning role;

[0009] The inner cavity cooperates with the end of the spring to accommodate the spring;

[0010] The air passage is a check valve air passage, so that when the check valve is in an open state, compressed gas can be introduced into the interior of the impactor through this passage.

[0011] The valve body is made of light material.

[0012] The valve body is made of engineering plastics or aluminum alloy.

[0013] An annular groove is processed on the sealing part, and an O-ring for sealing and cooperating with the matching surface is positioned and installed through the annular groove.

[0014] The sealing part of the check valve adopts the metal processing valve body described in Patent No. ZL201920973620.1 and adopts a hot injection rubber forming structure, and the first sealing part is formed by hot injecting rubber on the valve body.

[0015] The gas passage is a notch-shaped passage or a through-hole-shaped passage.

[0016] The radial clearance between the matching part and the inner cavity is smaller than the radial clearance between the auxiliary matching part and the inner cavity of the valve rod; the axial reciprocating motion of the check valve is not interfered by other parts of the impactor, and it can always maintain effective sealing cooperation with the rear joint.

[0017] The impactor using the new check valve comprises an impactor body, wherein a check valve is arranged inside the impactor body, and a sealing portion of the check valve cooperates with a matching surface inside a rear joint of the impactor body to close the airway, so as to avoid reverse leakage of compressed gas inside the impactor when the machine is shut down; the matching portion of the check valve forms a sliding fit with the inner cavity of the rear joint, and the auxiliary matching portion of the check valve cooperates with a gas distribution rod inside the impactor body.

[0018] A valve core is arranged inside the gas distribution rod. The valve core is a stepped shaft structure, with a large end matched with the inner cavity of the gas distribution rod and a small end matched with the inner circle gap of the spring.

[0019] A valve core is arranged inside the gas distribution rod, and the gas distribution rod and the valve core are an integrated structure. The auxiliary matching part can cooperate with the inner cavity of the gas distribution rod to assist in positioning; the raised shaft body provided in the inner cavity of the large end of the gas distribution rod cooperates with the inner ring gap of the spring to play a guiding role.

[0020] Alternatively, no valve core is installed in the gas distribution rod inner cavity of the gas distribution rod, and a spring is directly installed in the gas distribution rod inner cavity, and both ends of the spring are respectively in contact with the gas distribution rod inner cavity and the check valve.

[0021] The present invention has the following beneficial effects:

[0022] 1. The check valve of the present invention can cooperate with the matching surface provided on the rear joint through the sealing part to close the airway, so as to avoid the reverse leakage of the compressed gas inside the impactor when the machine is stopped; the matching part forms a sliding fit with the inner cavity of the rear joint, and the check valve can slide back and forth along the axial direction of the cavity during operation to play a role in radial positioning; the auxiliary matching part can cooperate with the inner cavity of the gas distribution rod to play a role in auxiliary positioning; the check valve is provided with an inner cavity to accommodate a spring; the air passage is the air passage of the check valve, and when the check valve is in an open state, the compressed gas can be introduced into the interior of the impactor from this passage.

[0023] 2. By adopting the check valve of the present invention and applying it to the impactor, the problem of muddy water backflow can be effectively avoided.

[0024] 3. By providing a valve core in the impactor to guide the compression or extension of the spring, the check valve is enabled to quickly and reliably open and close the gas path. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a structural schematic diagram of an existing impactor and a check valve.

[0027] Figure 2 It is a structural schematic diagram of an existing check valve.

[0028] Figure 3 It is the structural diagram of the check valve of the present invention.

[0029] Figure 4 It is a schematic diagram of the structure of the impactor and the check valve during the air intake process of the present invention.

[0030] Figure 5 It is a schematic diagram of the structure of the impactor and the check valve during the sealing process of the present invention.

[0031] Figure 6 It is a schematic diagram of the valve core structure of the present invention.

[0032] Figure 7 This is a schematic diagram of the integrated structure of the gas distribution rod and the valve core of the present invention.

[0033] Figure 8 The present invention adopts the check valve with the sealing part structure in ZL201920973620.1.

[0034] Fig. 9 It is a schematic diagram of the structure of the present invention when the valve core is not installed.

[0035] In the figure: rear joint 1, spring 2, check valve 3, valve core 4, gas distribution rod 6, impactor body 7;

[0036] Matching surface 11, inner cavity 12;

[0037] Sealing portion 31, matching portion 32, auxiliary matching portion 33, inner cavity 34, air passage 35, valve body 36, annular groove 37, first sealing portion 38;

[0038] Big end 41, little end 42;

[0039] The inner cavity 61 of the gas distribution rod and the protruding shaft body 62. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0041] Embodiment 1:

[0042] like Figure 3-9 , a new type of check valve, the check valve 3 includes a valve body 36, the valve body 36 is provided with a sealing portion 31, a matching portion 32, an auxiliary matching portion 33, an inner cavity 34 and an air passage 35; during operation, the sealing portion 31 can cooperate with the matching surface 11 provided on the rear joint 1 to close the airway; the matching portion 32 forms a sliding fit with the inner cavity 12 of the rear joint 1, and enables the check valve to always slide back and forth along the central axis direction of the cavity during operation to achieve radial positioning; the auxiliary matching portion 33 can cooperate with the inner cavity 61 of the gas distribution rod 6 and play an auxiliary positioning role; the inner cavity 34 cooperates with the end of the spring 2 to accommodate the spring; the air passage 35 is the air passage of the check valve, so that when the check valve is in the open state, compressed gas can be introduced into the inside of the impactor from this channel. By adopting the check valve of the above structure, it can be ensured that the check valve 3 has high coaxiality and assembly accuracy during the reciprocating motion, so that during the working process, it will not be disturbed by other parts of the impactor during the motion process, thereby ensuring the reliability of its sealing.

[0043] Furthermore, the valve body 36 is made of light material, which effectively reduces its mass and ensures its flexibility of movement.

[0044] Furthermore, the valve body 36 is made of engineering plastic or aluminum alloy.

[0045] Furthermore, an annular groove 37 is processed on the sealing portion 31, and an O-ring for sealing and matching with the matching surface 11 is positioned and installed through the annular groove 37. By adopting the above sealing structure, the reliability of the sealing is guaranteed, and the installation and assembly of the O-ring is simple.

[0046] Furthermore, the sealing portion 31 of the check valve 3 adopts the metal processing valve body described in Patent No. ZL201920973620.1 and adopts a hot-injection rubber forming structure, and the first sealing portion 38 is formed by hot-injecting rubber on the valve body 36. The first sealing portion 38 with the above structure improves the bonding strength between the rubber and the valve body 36, ensures the reliability of the bonding, and further enhances the sealing effect and ensures the reliability of the sealing.

[0047] Furthermore, the air passage 35 is a notch-shaped passage or a through-hole-shaped air passage. The above-mentioned air passage method ensures that the check valve 3 is always matched with the inner cavity 12 of the rear joint during the air passage process.

[0048] Furthermore, the radial clearance between the matching portion 32 and the inner cavity 12 is smaller than the radial clearance between the auxiliary matching portion 33 and the inner cavity 61 of the valve rod; the axial reciprocating motion of the check valve is not interfered by other components of the impactor, and it can always maintain an effective sealing fit with the rear joint.

[0049] Embodiment 2:

[0050] The check valve 3 with the above structure can effectively avoid the problem of muddy water backflow. In this embodiment, the check valve 3 with the above structure is used and used in the impactor. Its specific structure is as follows:

[0051] The impactor using the new check valve includes an impactor body 7, a check valve 3 is arranged inside the impactor body 7, a sealing portion 31 of the check valve 3 cooperates with the matching surface 11 inside the rear joint 1 of the impactor body 7 to close the airway, so as to avoid reverse leakage of compressed gas inside the impactor when the machine is shut down; the matching portion 32 of the check valve 3 forms a sliding fit with the inner cavity 12 of the rear joint 1, and the auxiliary matching portion 33 of the check valve 3 cooperates with the gas distribution rod 6 inside the impactor body 7.

[0052] Furthermore, a valve core 4 is provided inside the gas distribution rod 6 . The valve core 4 is a stepped shaft structure, the large end 41 cooperates with the gas distribution rod inner cavity 61 , and the small end 42 cooperates with the inner ring clearance of the spring 2 .

[0053] Furthermore, a valve core is provided inside the gas distribution rod 6, and the gas distribution rod 6 and the valve core 4 are an integrated structure. The auxiliary matching part 33 can cooperate with the inner cavity 61 of the gas distribution rod to play an auxiliary positioning role; the raised shaft body 62 provided in the inner cavity of the large end of the gas distribution rod 6 cooperates with the inner ring gap of the spring 2 to play a guiding role.

[0054] Embodiment 3:

[0055] See also Fig. 9No valve core is installed inside the gas distribution rod inner cavity 61 of the gas distribution rod 6. The spring 2 is directly installed inside the gas distribution rod inner cavity 61, and both ends of the spring 2 are in contact with the gas distribution rod inner cavity 61 and the check valve 3 respectively.

Claims

1. A new type of check valve, characterized by: The check valve (3) comprises a valve body (36), on which a sealing portion (31), a matching portion (32), an auxiliary matching portion (33), an inner cavity (34) and an air passage (35) are provided; during operation, the sealing portion (31) can cooperate with a matching surface (11) provided on the rear joint (1) to close the air passage; The matching portion (32) forms a sliding match with the inner cavity (12) of the rear joint (1), and enables the check valve to always slide back and forth along the central axis of the cavity when working, so as to achieve radial positioning; The auxiliary matching portion (33) can match with the gas distribution rod inner cavity (61) of the gas distribution rod (6) and play an auxiliary positioning role; The inner cavity (34) cooperates with the end of the spring (2) to accommodate the spring; The air passage (35) is a check valve air passage, so that when the check valve is in an open state, compressed gas can be introduced into the interior of the impactor through this passage.

2. A novel check valve according to claim 1, characterized in that: The valve body (36) is made of lightweight material.

3. A novel check valve according to claim 1, characterized in that: The valve body (36) is made of engineering plastic or aluminum alloy.

4. A novel check valve according to claim 1, characterized in that: The sealing portion (31) is machined with an annular groove (37), and an O-ring for sealingly cooperating with the matching surface (11) is positioned and installed through the annular groove (37).

5. A novel check valve according to claim 1, characterized in that: The sealing portion (31) of the check valve (3) adopts a hot-injection rubber molding structure, and the first sealing portion (38) is formed by hot-injecting rubber on the valve body (36).

6. A novel check valve according to claim 1, characterized in that: The gas passage (35) is a notch-shaped passage or a through-hole-shaped gas passage.

7. A novel check valve according to claim 1, characterized in that: The radial clearance between the matching portion (32) and the inner cavity (12) is smaller than the radial clearance between the auxiliary matching portion (33) and the inner cavity (61) of the gas distribution rod; the reciprocating motion of the check valve along the axial direction is not interfered by other components of the impactor, and can always maintain effective sealing cooperation with the rear joint.

8. An impactor using the novel check valve according to any one of claims 1 to 7, comprising an impactor body (7), characterized in that: A check valve (3) is provided inside the impactor body (7); a sealing portion (31) of the check valve (3) cooperates with a matching surface (11) inside the rear joint (1) of the impactor body (7) to close the air passage, thereby preventing reverse leakage of compressed gas inside the impactor when the impactor is shut down; a matching portion (32) of the check valve (3) and an inner cavity (12) of the rear joint (1) form a sliding fit, and an auxiliary matching portion (33) of the check valve (3) cooperates with a gas distribution rod (6) inside the impactor body (7).

9. The impactor according to claim 8, characterized in that: A valve core (4) is arranged inside the gas distribution rod (6). The valve core (4) is a stepped shaft structure, the large end (41) cooperates with the inner cavity (61) of the gas distribution rod, and the small end (42) cooperates with the inner ring clearance of the spring (2).

10. The impactor according to claim 8, characterized in that: A valve core is provided inside the gas distribution rod (6); the gas distribution rod (6) and the valve core are an integrated structure; the auxiliary matching portion (33) can cooperate with the inner cavity (61) of the gas distribution rod to assist in positioning; a raised shaft body (62) provided in the inner cavity of the large end of the gas distribution rod (6) cooperates with the inner ring clearance of the spring (2) to play a guiding role; Alternatively, no valve core is installed inside the gas distribution rod inner cavity (61) of the gas distribution rod (6), and a spring (2) is directly installed inside the gas distribution rod inner cavity (61), so that two ends of the spring (2) are in contact with the gas distribution rod inner cavity (61) and the check valve (3) respectively.

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