Extractor for valve rubber in pump

Abstract

The invention discloses an extractor for valve rubber in a pump, and relates to the technical field of valve rubber removal, the extractor comprises a pull rod used for extending into a center hole of a valve seat of a fracturing pump, the pull rod is hollow, and a cutter hole is formed in the side wall of the lower end of the pull rod; the tool bit is located in the pull rod, is limited in the axial direction of the pull rod and can horizontally move in the radial direction of the pull rod, and a puncture part of the tool bit can penetrate through the tool hole and pierce into valve rubber; the push rod is arranged in the pull rod in a penetrating mode, and when the push rod moves downwards, the tool bit can be pushed to horizontally move in the direction close to the tool hole. According to the extractor for the valve rubber in the pump, the valve rubber in the pump can be efficiently and conveniently taken out.

Description

Technical Field

[0001] The invention relates to the technical field of valve rubber removal, in particular to a valve rubber remover in a pump. Background Art

[0002] The fracturing pump is a key device used in the implementation of fracturing technology in low permeability oil and gas wells. It is equipped with a valve rubber as a seal. Since the valve rubber is interference-fitted in the valve seat inside the pump, it is tightly fitted and difficult to disassemble. It is particularly difficult and time-consuming to replace it on site. Therefore, it is urgent to design a technical solution that can efficiently and conveniently remove the valve rubber in the pump. Summary of the invention

[0003] The purpose of the present invention is to provide a valve rubber remover for a pump to solve the problems existing in the above-mentioned prior art and to be able to efficiently and conveniently remove the valve rubber in the pump.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a pump valve rubber extractor, comprising:

[0006] A pull rod, used to extend into the center hole of the valve seat of the fracturing pump, wherein the pull rod is hollow inside and a knife hole is opened on the side wall of the lower end;

[0007] The cutter head is located inside the pull rod, is limited along the axial direction of the pull rod, and can move horizontally along the radial direction of the pull rod. The puncture part of the cutter head can pass through the cutter hole and pierce the valve rubber.

[0008] The push rod is inserted into the pull rod, and when the push rod moves downward, it can push the cutter head to move horizontally toward the cutter hole.

[0009] Preferably, a limiting portion is provided inside the pull rod, and the cutter head is movably connected to the limiting portion, the limiting portion can prevent the cutter head from moving axially along the pull rod, and the cutter head can move horizontally and radially along the limiting portion.

[0010] Preferably, the limiting portion includes a screw pin, a threaded hole is formed on the side wall of the pull rod, the screw pin is horizontally fixed in the pull rod from the threaded hole, and the cutter head is provided with a sliding through hole, which is slidably penetrated on the screw pin.

[0011] Preferably, a slope surface is provided on one side of the bottom of the push rod close to the knife hole, and the slope surface can abut against the top of the knife head.

[0012] Preferably, limit pins are fixedly threadedly connected on both sides of the push rod, and axially arranged strip holes are opened on both side walls of the pull rod, and the limit pin is movably arranged in the strip hole on the same side away from one end of the push rod.

[0013] Preferably, it also includes a sliding hammer sleeve, which is movably mounted on the pull rod; a horizontal outward step is fixedly provided on the top of the pull rod, and the sliding hammer sleeve is located between the limit pin and the step.

[0014] Preferably, a guide hole is provided at the upper part of the knife hole, and a knife retraction hole is provided at the lower part; a guide rod is provided at the upper end of the puncture part of the knife head, and a knife retraction rod is provided at the lower end; the guide rod and the knife retraction rod are arranged parallel to the puncture part, and the guide rod can be movably inserted into the guide hole, and the knife retraction rod can be movably inserted into the knife retraction hole.

[0015] Preferably, a countersunk screw is provided at one end of the tool withdrawal hole away from the tool head.

[0016] Preferably, a horizontally arranged positioning protrusion is provided on the lower side wall of the pull rod, the positioning protrusion is located above the knife hole, and the positioning protrusion can abut against the top of the valve seat of the fracturing pump.

[0017] Preferably, the inclination angle of the slope surface is 35°; and the top of the cutter head is a smooth arc angle.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] The present invention firstly retracts the puncture part of the cutter head into the cutter hole of the pull rod, then vertically inserts the pull rod into the center hole of the valve seat, inserts the push rod into the pull rod, and manually pushes the push rod downward, so that the lower end of the push rod contacts the upper end of the cutter head and squeezes the cutter head. Due to the axial limitation of the cutter head, the cutter head moves horizontally to the side close to the cutter hole under the action of the squeezing force, so that the puncture part is pushed out of the cutter hole laterally, and the puncture part pierces the valve rubber after passing through the cutter hole. When the puncture part of the cutter head completely pierces the valve rubber, the pull rod is lifted upward, and the valve rubber can be easily pulled out of the valve seat, thereby improving the efficiency of taking out the valve rubber, being simple to operate, and not damaging the valve seat at all, thereby shortening the time for operators to replace accessories and indirectly extending the service life of the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the inner valve rubber remover in one or some embodiments of the present invention;

[0022] Figure 2A schematic diagram of a case where the blade head of the inner valve rubber extractor is in another position in one or some embodiments of the present invention;

[0023] Figure 3 It is a schematic diagram of the working state of the inner valve rubber remover in one or some embodiments of the present invention.

[0024] In the figure: 1-pull rod, 101-step, 102-positioning convex, 103-bar hole, 104-knife hole, 105-guide hole, 106-knife withdrawal hole, 2-sliding hammer sleeve, 3-push rod, 301-slope surface, 4-limiting pin, 5-knife head, 501-puncture part, 502-guide rod, 503-knife withdrawal rod, 6-countsunk screw, 7-screw pin, 8-fracturing pump, 9-valve seat, 10-valve rubber. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide a valve rubber remover for a pump to solve the problems existing in the above-mentioned prior art and to be able to efficiently and conveniently remove the valve rubber in the pump.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] After the fracturing pump is used, the working surface of the valve rubber is subjected to direct impact of the valve body, scouring, wear and erosion by high-pressure fluid media for a long time, which causes the wall of the valve rubber to become thinner and the material to age and harden. Therefore, in the technical solutions for removing the valve rubber known to the inventor, it is difficult for a flat-bladed screwdriver to accurately penetrate the valve rubber, resulting in that removing the valve rubber is very time-consuming and labor-intensive. In order to allow the flat-bladed screwdriver to penetrate into the valve rubber, it is generally necessary to knock the handle from the outside. When knocking the flat-bladed screwdriver to penetrate the valve rubber, it is easy to slip and use excessive force, resulting in the flat-bladed screwdriver directly piercing the threaded part of the upper end of the valve seat. It is also possible that the flat-bladed screwdriver pierces the valve rubber, causing the sealing surface of the valve seat to be pierced by the sharp part of the flat-bladed screwdriver, resulting in seal failure.

[0029] In order to avoid the defects of the above scheme and improve the efficiency of removing the valve rubber, the inventor has designed an inner valve rubber remover, referring to Figure 1 and Figure 2As shown, it includes a pull rod 1, a cutter head 5 and a push rod 3. The pull rod 1 is used to extend into the center hole of the valve seat 9 of the fracturing pump 8. The pull rod 1 is hollow inside, and a cutter hole 104 is opened at the side wall of the lower end; the lower side wall of the pull rod 1 is provided with a horizontally arranged positioning protrusion 102, the positioning protrusion 102 is located above the cutter hole 104, and the positioning protrusion 102 can abut against the top of the valve seat 9 of the fracturing pump 8, so that the pull rod 1 can be positioned at the valve seat 9, and at this time, the cutter hole 104 is at the same height as the valve rubber 10. A cutter head 5 is movably provided inside the pull rod 1, and a limiting portion is provided inside the pull rod 1. The cutter head 5 is movably connected to the limiting portion. The limiting portion can prevent the cutter head 5 from moving axially along the pull rod 1, and the cutter head 5 can move horizontally and radially along the limiting portion. When the cutter head 5 moves horizontally close to the knife hole 104, the puncture portion 501 of the cutter head 5 can pass through the knife hole 104 and pierce the valve rubber 10; the push rod 3 is penetrated in the pull rod 1, and a slope surface 30 with an inclination angle of 35° is provided on one side of the bottom of the push rod 3 close to the knife hole 104. 1, the slope surface 301 can abut against the smooth arc angle of the top of the cutter head 5, so that when the push rod 3 moves downward, the slope surface 301 at its bottom moves relative to the top of the cutter head 5. Due to the axial limitation of the cutter head 5, the slope surface 301 can push the cutter head 5 to move horizontally close to the knife hole 104 during the downward process, until the puncture part 501 of the cutter head 5 passes through the knife hole 104 and pierces the valve rubber 10; the puncture part 501 of this embodiment is a puncture needle or bayonet with an inclined blade at the end.

[0030] The specific structure of the limiting part is not limited, as long as it can limit the downward movement of the cutter head 5 in the axial direction and will not limit the horizontal movement of the cutter head 5. In some embodiments, a horizontal slider can be set in the pull rod 1 as a limiting part, and the slider is fixed to the bottom of the cutter head 5, so as to achieve the above function. The limiting part in this embodiment adopts a screw pin 7, and a threaded hole is opened on the side wall of the pull rod 1 away from the knife hole 104. The screw pin 7 is horizontally fixed in the pull rod 1 from the threaded hole, and the cutter head 5 is provided with a sliding through hole, which is slidably penetrated on the screw pin 7, so that the cutter head 5 cannot move axially, but can move horizontally along the screw pin 7.

[0031] In order to ensure safety during use, in one embodiment, horizontally arranged limit pins 4 are fixedly threaded on both sides of the push rod 3, and axially arranged bar holes 103 are opened on both side walls of the pull rod 1. The limit pin 4 is movably arranged in the bar hole 103 on the same side away from one end of the push rod 3, so that when the push rod 3 moves upward or downward, the limit pin 4 can limit the moving position of the push rod 3 to prevent the push rod 3 from moving downward too much, and the slope surface 301 is stuck on the side of the blade 5 away from the puncture part 501. At the same time, it can also prevent the push rod 3 from completely withdrawing from the pull rod 1 when moving upward. On this basis, the two limit pins 4 and the two strip holes 103 correspond one to one, and the push rod 3 can also be limited circumferentially to prevent the push rod 3 from rotating and misaligning during use. Due to the circumferential limiting effect on the push rod 3, the slope surface 301 at the bottom of the push rod 3 can always be on the side close to the knife hole 104, thereby ensuring that when the push rod 3 and the slope surface 301 move downward, the cutter head 5 can be pushed to move toward the side close to the knife hole 104 without reverse movement.

[0032] The valve rubber 10 is fixed and tightly connected to the valve seat 9, so it is not easy to remove the valve rubber 10 from the valve seat 9; in order to enable the valve rubber 10 to be removed from the valve seat 9 after the puncture part 501 is inserted into the valve rubber 10, a sliding hammer sleeve 2 is designed in this embodiment, and the sliding hammer sleeve 2 is movably sleeved on the pull rod 1; a horizontal outward step 101 is fixedly provided on the top of the pull rod 1, and the sliding hammer sleeve 2 is located between the limit pin 4 and the step 101; when the puncture part 501 of the blade 5 is inserted into the valve rubber 10, the sliding hammer sleeve 2 is held by hand, and the end face of the step 101 at the upper end of the pull rod 1 is knocked by sliding upward. At this time, the valve rubber 10 can be easily pulled out of the valve seat 9 through the vertical upward pulling force of the sliding hammer sleeve 2 and the pull rod 1.

[0033] After the pump valve rubber 10 extractor of the present invention successfully removes the valve rubber 10 on the valve seat 9, how to remove the valve rubber 10 from the pump valve rubber 10 extractor becomes another problem that needs to be solved urgently. In order to solve this problem, the overall design of the cutter head 5 of this embodiment is similar to a horizontal "mountain" shaped structure, and a guide rod 502 is provided at the upper end of the puncture portion 501 of the cutter head 5, and a knife withdrawal rod 503 is provided at the lower end. The guide rod 502 and the knife withdrawal rod 503 are arranged parallel to the puncture portion 501, and the length of the puncture portion 501 located in the middle is greater than the length of the guide rod 502 and the knife withdrawal rod 503; further, a guide hole 105 is provided at the upper part of the knife hole 104, and a knife withdrawal hole 106 is provided at the lower part, the guide rod 502 can be movably inserted into the guide hole 105, and the knife withdrawal rod 503 can be movably inserted into the knife withdrawal hole 106, and a countersunk screw 6 is provided at the end of the knife withdrawal hole 106 away from the cutter head 5. After the valve rubber 10 is taken out from the fracturing pump 8 together with the valve rubber 10 extractor in the pump, the valve rubber 10 extractor in the pump is placed horizontally, and an Allen wrench is used to insert the countersunk screw 6, and the countersunk screw 6 is rotated clockwise to move it into the withdrawal hole 106, thereby pushing the withdrawal rod 503 to move the cutter head 5 as a whole away from the cutter hole 104, and the puncture part 501 of the cutter head 5 is pushed out from the valve rubber 10, and then the valve rubber 10 can be easily removed.

[0034] refer to Figure 3As shown, when the extractor for the valve rubber 10 in the pump of this embodiment is used, the puncture portion 501 of the cutter head 5 is first withdrawn into the knife hole 104 of the pull rod 1, and then the pull rod 1 is inserted into the center hole of the valve seat 9. The entire device is vertically arranged above the valve seat 9, and the push rod 3 is manually pushed downward. After the slope surface 301 at the lower end of the push rod 3 contacts the vertical arc angle of the top of the cutter head 5, it slides parallel to the direction of 35 degrees, so that the puncture portion 501 of the cutter head 5 is horizontally pushed out of the knife hole 104, and the tip of the puncture portion 501 pierces the valve rubber 10. When the resistance cannot be pushed down manually, a small hammer can be used to gently tap the top of the push rod 3 to insert the puncture portion 501 into the valve rubber 10. When the retraction rod 503 of the cutter head 5 abuts against the countersunk screw 6, the limit position is reached. At this time, the cutter head 5 is limited and can no longer move laterally toward the knife hole 104. At this time, the puncture portion 501 just penetrates into the valve rubber 10, and the end of the puncture portion 501 has not reached the position where it completely pierces the valve rubber 10 and contacts the sealing surface of the valve seat 9, thereby not damaging the sealing surface of the valve seat 9. The screw pin shaft 7 of the push rod 3 moves up and down in the bar hole 103. The length of the bar hole 103 is the travel space of the push rod 3, so there is no need to worry that the puncture part 501 will damage the sealing surface of the valve seat 9. When the cutter head 5 is completely inserted into the valve rubber 10, hold the sliding hammer sleeve 2 in your hand and slide upward to knock on the end face of the step 101 at the upper end of the pull rod 1. At this time, the vertical upward pulling force will easily pull the valve rubber 10 out of the valve seat 9, and take the valve rubber 10 out of the fracturing pump 8 together with the valve rubber 10 extractor in the pump, and then place the valve rubber 10 extractor in the pump and the valve rubber 10 as a whole horizontally on the platform, use an Allen wrench to insert it into the countersunk screw 6, and rotate the countersunk screw 6 clockwise to push the retraction rod away from the retraction hole 106, thereby pushing the cutter head 5 out of the valve rubber 10.

[0035] When it is necessary to remove the valve rubber 10 in the lower suction chamber of the fracturing pump 8, the process is the same as above. The method of removing the valve rubber 10 of the present invention is not only efficient and simple to operate, but also does not damage the valve seat 9 at all, which not only shortens the time for operators to replace accessories, but also indirectly prolongs the service life of the valve seat 9.

[0036] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A pump valve rubber remover, characterized in that: include: A pull rod, used to extend into the center hole of the valve seat of the fracturing pump, wherein the pull rod is hollow inside and a knife hole is opened on the side wall of the lower end; The cutter head is located inside the pull rod, is limited along the axial direction of the pull rod, and can move horizontally along the radial direction of the pull rod. The puncture part of the cutter head can pass through the cutter hole and pierce the valve rubber. The push rod is inserted into the pull rod, and when the push rod moves downward, it can push the cutter head to move horizontally toward the cutter hole.

2. The pump valve rubber extractor according to claim 1, characterized in that: A limiting portion is provided inside the pull rod, and the cutter head is movably connected to the limiting portion. The limiting portion can prevent the cutter head from moving axially along the pull rod, and the cutter head can move horizontally and radially along the limiting portion.

3. The pump valve rubber extractor according to claim 2, characterized in that: The limiting part includes a screw pin shaft, a threaded hole is opened on the side wall of the pull rod, the screw pin shaft is horizontally fixed in the pull rod through the threaded hole, and the cutter head is provided with a sliding through hole, and the sliding through hole is slidably penetrated on the screw pin shaft.

4. The pump valve rubber extractor according to claim 1, characterized in that: A slope surface is provided on one side of the bottom of the push rod close to the knife hole, and the slope surface can abut against the top of the knife head.

5. The pump valve rubber extractor according to claim 1, characterized in that: The two sides of the push rod are fixedly threadedly connected with limit pins, and the two side walls of the pull rod are provided with strip holes arranged along the axial direction. The limit pin is movably arranged in the strip hole on the same side away from one end of the push rod.

6. The pump valve rubber extractor according to claim 5, characterized in that: It also includes a sliding hammer sleeve, which is movably mounted on the pull rod; a horizontal outward step is fixedly provided on the top of the pull rod, and the sliding hammer sleeve is located between the limit pin and the step.

7. The pump valve rubber extractor according to claim 1, characterized in that: A guide hole is provided at the upper part of the knife hole, and a knife withdrawal hole is provided at the lower part. A guide rod is provided at the upper end of the puncture part of the knife head, and a knife withdrawal rod is provided at the lower end. The guide rod and the knife withdrawal rod are both arranged parallel to the puncture part, and the guide rod can be movably inserted into the guide hole, and the knife withdrawal rod can be movably inserted into the knife withdrawal hole.

8. The pump valve rubber extractor according to claim 7, characterized in that: A countersunk screw is arranged at one end of the tool withdrawal hole away from the tool head.

9. The pump valve rubber extractor according to claim 1, characterized in that: A horizontally arranged positioning protrusion is provided on the lower side wall of the pull rod. The positioning protrusion is located above the knife hole, and the positioning protrusion can abut against the top of the valve seat of the fracturing pump.

10. The pump valve rubber remover according to claim 4, characterized in that: The inclination angle of the slope surface is 35°; the top of the cutter head is a smooth arc angle.

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