Bidirectional hydraulic jar damping device

Abstract

The utility model discloses a damping device of a bidirectional hydraulic jar. Comprising a hydraulic cavity outer cylinder; the mandrel is arranged in the cavity, and the mandrel and the hydraulic cavity outer cylinder are concentrically arranged; the damping valve body is arranged in the middle of the mandrel in a sleeving mode, and a pair of valve holes parallel to the axial direction are evenly distributed in the damping valve body; the inner periphery of the damping valve body is in high-pressure sealing connection with the mandrel; the periphery of the damping valve body is in interference fit with the inner wall of the hydraulic cavity outer cylinder; the pair of damping valve cores are respectively arranged in the valve holes and are matched with the valve holes; a spiral overflowing groove is formed in the periphery of the damping valve element. And the fixing sleeve is sleeved at the rear part of the mandrel and is in threaded connection with the mandrel. The damping valve has the advantages that when the mandrel carries the damping valve element to move from the normal-pressure cavity to the high-pressure cavity, the spiral overflowing groove can effectively slow down the flow speed of hydraulic oil passing through the damping valve body, and therefore delay time is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of drilling tool technology, and in particular to a two-way hydraulic shock absorber damping device. Background Technology

[0002] Hydraulic shock absorbers are a mature drilling tool characterized by their simple structure. However, due to the slight gap between the damping valve orifice and the valve core, and the fact that the conventional damping valve and the spindle can move due to the hydraulic difference, the sealing must be done with metal seals. This characteristic results in the following: firstly, conventional damping structures require high machining precision; secondly, once the valve orifice and the metal seal are damaged, the damping function is lost. Utility Model Content

[0003] The purpose of this invention is to provide a bidirectional hydraulic shock absorber damping device, which includes a hydraulic chamber outer cylinder, a spindle, a damping valve body, a damping valve core, and a fixing sleeve. When the spindle carries the damping valve core from the normal pressure chamber to the high pressure chamber, there is no gap between the damping valve body and the damping valve core. The damping valve core has a spiral flow groove, which effectively slows down the flow rate of hydraulic oil through the damping valve body, thereby increasing the delay time and delaying the spindle's movement speed. When damping is not needed, the spindle moves in the opposite direction. At this time, the hydraulic oil in the hydraulic chamber exerts a slight pressure on the damping valve core, causing the damping valve core to leave the valve hole, widening the hydraulic oil flow channel, thus eliminating the damping effect and preventing the delay of the spindle's movement speed.

[0004] To achieve the above objectives, the present invention adopts the following technical solution, including:

[0005] The hydraulic chamber outer cylinder has an axially penetrating cavity inside;

[0006] A mandrel is disposed within the cavity and is concentrically arranged with the outer cylinder of the hydraulic cavity; an axially penetrating inner cavity is provided inside the mandrel; a radially enlarged limiting part is provided on the outer peripheral surface of the front part of the mandrel;

[0007] A damping valve body is sleeved on the middle of the mandrel, and a pair of valve holes are evenly distributed on the damping valve body parallel to the axial direction; the front end of the damping valve body abuts against the limiting part; the inner periphery of the damping valve body is connected to the mandrel under high pressure and sealing; the outer periphery of the damping valve body is interference-fitted with the inner wall of the outer cylinder of the hydraulic chamber; and

[0008] A pair of damping valve cores are respectively disposed in the valve orifice and adapted to the valve orifice; a spiral flow groove is provided on the outer periphery of the damping valve core;

[0009] A fixing sleeve is fitted onto the rear part of the spindle and threadedly connected to the spindle; the front end of the fixing sleeve abuts against the rear end of the damping valve body.

[0010] The valve orifice is a conical orifice, and the inner diameter of the valve orifice gradually tapers from the starting end to the end end; the outer periphery of the damping valve core is conical.

[0011] Preferably, the taper of the valve orifice is 2.2°, and the taper of the outer periphery of the damping valve core is 2.2°.

[0012] Preferably, the cross-section of the spiral flow channel is square.

[0013] Preferably, the inner circumference of the front end of the damping valve body is provided with an 18-22° chamfer, and the end of the limiting part is provided with a 25-35° bevel.

[0014] Preferably, a pair of radially arranged pin holes are provided at the front of the fixing sleeve, and the pins pass through the pin holes to connect the fixing sleeve to the mandrel, thereby preventing the fixing sleeve from disengaging.

[0015] Preferably, a 30° chamfer is provided on the inner circumference of the front end of the fixing sleeve.

[0016] Preferably, two parallel sealing ring mounting grooves are provided on the outer periphery of the middle part of the mandrel, and high-pressure sealing rings are respectively provided in the sealing ring mounting grooves to achieve a high-pressure sealing connection between the inner periphery of the damping valve body and the mandrel.

[0017] Preferably, the cavity of the outer cylinder of the hydraulic chamber is a variable diameter hole, and the cavity is composed of a first hole, a transition section, a second hole, a transition section and a third hole in sequence from the starting end to the end; the first hole and the third hole have the same diameter, and the diameter of the first hole and the third hole is larger than the diameter of the second hole; the transition section has a chamfered structure of 8-12°, and is smoothly connected to the second hole through rounded corners with a radius of 10-15mm.

[0018] Preferably, the hardness of the damping valve body is less than the hardness of the damping valve core, the fixing sleeve, the mandrel, and the outer cylinder of the hydraulic chamber.

[0019] The beneficial effects of this utility model are as follows: It comprises a hydraulic chamber outer cylinder, a mandrel, a damping valve body, a damping valve core, and a fixing sleeve. When the mandrel carries the damping valve core from the normal pressure chamber to the high pressure chamber, there is no gap between the damping valve body and the damping valve core. The damping valve core has a spiral flow groove, which effectively slows down the flow rate of hydraulic oil through the damping valve body, thereby increasing the delay time and achieving the purpose of delaying the mandrel's movement speed. When damping is not needed, the mandrel moves in the opposite direction. At this time, the hydraulic oil in the hydraulic chamber will exert a slight pressure on the damping valve core, causing the damping valve core to leave the valve hole, widening the flow channel of the hydraulic oil, thus eliminating the damping effect and preventing the delay of the mandrel's movement speed. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of a bidirectional hydraulic shock absorber damping device according to the present invention.

[0021] Figure 2 This is a cross-sectional view of the outer cylinder of the hydraulic cavity in this utility model.

[0022] Figure 3 This is a cross-sectional view of the central axis of this utility model.

[0023] Figure 4 This is a cross-sectional view of the damping valve body in this utility model.

[0024] Figure 5 This is a perspective view of the damping valve core in this utility model.

[0025] Figure 6 This is a cross-sectional view of the fixing sleeve in this utility model. Detailed Implementation

[0026] The utility model will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0027] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0028] like Figure 1-6 As shown, a bidirectional hydraulic shock absorber damping device 1 of this utility model includes:

[0029] The hydraulic chamber outer cylinder 110 has an axially penetrating cavity inside. Preferably, the cavity of the hydraulic chamber outer cylinder 110 is a variable diameter hole, and the cavity is composed of a first hole 111, a transition portion 112, a second hole 113, a transition portion 114 and a third hole 114 in sequence from the starting end to the end. The first hole 111 and the third hole 114 have the same diameter, and the diameter of the first hole 111 and the third hole 114 is larger than the diameter of the second hole 113. The transition portion 112 has a chamfered structure of 8-12° and is smoothly connected to the second hole 113 by a fillet 115 with a radius of 10-15mm.

[0030] A spindle 120 is disposed within the cavity and is concentrically arranged with the outer cylinder 110 of the hydraulic chamber. An axially penetrating inner cavity is provided inside the spindle 120. A radially enlarged limiting portion 121 is provided on the outer circumferential surface of the front part of the spindle 120. Preferably, two parallel sealing ring mounting grooves 122 are provided on the outer circumference of the middle part of the spindle 120, and high-pressure sealing rings 123 are respectively provided in the sealing ring mounting grooves 122 to achieve a high-pressure sealed connection between the inner circumference of the damping valve body 130 and the spindle 120.

[0031] A damping valve body 130 is sleeved within the mandrel 120. A pair of valve holes 131, parallel to the axial direction, are evenly distributed on the damping valve body 130. The front end of the damping valve body 130 abuts against the limiting portion 121. The inner circumference of the damping valve body 130 is in a high-pressure sealed connection with the mandrel 120. The outer circumference of the damping valve body 130 is interference-fitted with the inner wall of the hydraulic chamber outer cylinder 110. Preferably, the inner circumference of the front end of the damping valve body 130 has an 18-22° chamfer 132, and the end of the limiting portion 121 has a 25-35° bevel. Under compression, the initial line contact between the damping valve body 130 and the limiting portion 121 of the mandrel 120 changes to surface contact, achieving a high-pressure metal seal.

[0032] A pair of damping valve cores 140 are respectively disposed in the valve holes 131 and adapted to the valve holes 131; a spiral flow groove 141 is provided on the outer periphery of the damping valve core 140. Preferably, the cross-section of the spiral flow groove 141 is square.

[0033] A retaining sleeve 150 is fitted onto the rear of the spindle 120 and threadedly connected to the spindle 120; the front end of the retaining sleeve 150 abuts against the rear end of the damping valve body 130. Preferably, a pair of radially arranged pin holes 151 are provided at the front of the retaining sleeve 150, through which pins 152 pass to connect the retaining sleeve 150 to the spindle 120, thereby preventing the retaining sleeve from disengaging. More preferably, a 30° chamfer 153 is provided on the inner circumference of the front end of the retaining sleeve 150.

[0034] The valve orifice 131 is a conical orifice, and its inner diameter gradually tapers from the starting end to the ending end; the outer periphery of the damping valve core 140 is conical. Preferably, the taper of the valve orifice 131 is 2.2°, and the taper of the outer periphery of the damping valve core 140 is 2.2°.

[0035] During use, the damping valve body 130 has a high-pressure chamber on the left and a normal-pressure chamber on the right. When the spindle 120 carries the damping valve core 140 from the normal-pressure chamber to the high-pressure chamber, the hydraulic oil in the high-pressure chamber will exert pressure on the damping valve core 140, causing the damping valve core 140 to insert into the valve hole 131. Since the damping valve core 140 is adapted to the valve hole 131, the outer circumference of the damping valve core 140 is tightly fitted with the inner wall of the valve hole 131. Furthermore, there is no gap between the damping valve body 130 and the outer cylinder 110 of the hydraulic chamber, and there is no gap between the damping valve body 130 and the spindle 120. At this time, most of the hydraulic oil can only flow from the high-pressure chamber into the normal-pressure chamber through the spiral flow groove 141. Since the spiral flow groove 141 is spiral, it can effectively reduce the flow rate of the hydraulic oil, generate a damping effect, and achieve the purpose of delaying the movement speed of the spindle 120. When damping is not required, the spindle 120 moves in the opposite direction. At this time, the hydraulic oil in the hydraulic chamber exerts a slight pressure on the damping valve core 140, causing it to move away from the valve hole 131. A gap exists between the outer circumference of the damping valve core 140 and the inner wall of the valve hole 131, widening the flow path of the hydraulic oil and thus eliminating damping and delaying the movement speed of the spindle 120. Damping structures with different delay times can be created using spiral flow grooves 141 with different pitches, widths, and lengths.

[0036] In another embodiment, the taper of the valve orifice 131 is 2.2°, and the taper of the outer periphery of the damping valve core 140 is 2.2°.

[0037] In another embodiment, the cross-section of the spiral flow channel 141 is square.

[0038] In another embodiment, the inner circumference of the front end of the damping valve body 130 is provided with an 18-22° chamfer, and the end of the limiting part 121 is provided with a 25-35° bevel.

[0039] In another embodiment, a pair of radially arranged pin holes 151 are provided at the front of the fixing sleeve 150, and the pin 152 passes through the pin holes to connect the fixing sleeve 150 to the spindle 120, thereby preventing the fixing sleeve from disengaging.

[0040] In another embodiment, a 30° chamfer 153 is provided on the inner circumference of the front end of the fixing sleeve 150.

[0041] In another embodiment, two parallel sealing ring mounting grooves 122 are provided on the outer periphery of the middle part of the mandrel 120, and high-pressure sealing rings 123 are respectively provided in the sealing ring mounting grooves to achieve a high-pressure sealing connection between the inner periphery of the damping valve body 130 and the mandrel 120.

[0042] In another embodiment, the cavity of the outer cylinder 110 of the hydraulic chamber is a variable diameter orifice, and the cavity is composed of a first orifice 111, a transition portion 112, a second orifice 113, a transition portion 112 and a third orifice 114 in sequence from the starting end to the end. The first orifice 111 and the third orifice 114 have the same diameter, and the diameter of the first orifice 111 and the third orifice 114 is larger than the diameter of the second orifice 113. The transition portion 112 has a chamfered structure of 8-12° and is smoothly connected to the second orifice 113 by a fillet 115 with a radius of 10-15mm.

[0043] In another embodiment, the hardness of the damping valve body 130 is less than that of the damping valve core 140, the fixing sleeve 150, the mandrel 120, and the hydraulic chamber outer cylinder 110. This facilitates deformation under compression, changing the initial line contact between the damping valve body 130 and the limiting portion 121 of the mandrel 120 into surface contact.

[0044] In summary, the present invention provides a bidirectional hydraulic shock absorber damping device 1, which includes a hydraulic chamber outer cylinder 110, a spindle 120, a damping valve body 130, a damping valve core 140, and a fixing sleeve 150. There is no gap between the damping valve body 130 and the damping valve core 140. The damping valve core 140 is provided with a spiral flow groove 141. The spiral flow groove 141 can effectively slow down the flow rate of hydraulic oil through the damping valve body, thereby increasing the delay time.

[0045] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A bidirectional hydraulic shock absorber damping device, characterized in that, include: The hydraulic chamber outer cylinder has an axially penetrating cavity inside; A mandrel is disposed within the cavity and is concentrically arranged with the outer cylinder of the hydraulic cavity; an axially penetrating inner cavity is provided inside the mandrel; a radially enlarged limiting part is provided on the outer peripheral surface of the front part of the mandrel; A damping valve body is sleeved on the middle of the mandrel, and a pair of valve holes are evenly distributed on the damping valve body parallel to the axial direction; the front end of the damping valve body abuts against the limiting part; the inner periphery of the damping valve body is connected to the mandrel under high pressure and sealing; the outer periphery of the damping valve body is interference-fitted with the inner wall of the outer cylinder of the hydraulic chamber; and A pair of damping valve cores are respectively disposed in the valve orifice and adapted to the valve orifice; a spiral flow groove is provided on the outer periphery of the damping valve core; A fixing sleeve is fitted onto the rear part of the spindle and threadedly connected to the spindle; the front end of the fixing sleeve abuts against the rear end of the damping valve body. The valve orifice is a conical orifice, and the inner diameter of the valve orifice gradually tapers from the starting end to the end end; the outer periphery of the damping valve core is conical.

2. The bidirectional hydraulic shock absorber damping device according to claim 1, characterized in that: The taper of the valve orifice is 2.2°, and the taper of the outer periphery of the damping valve core is 2.2°.

3. The bidirectional hydraulic shock absorber damping device according to claim 1, characterized in that: The cross-section of the spiral flow channel is square.

4. The bidirectional hydraulic shock absorber damping device according to claim 1, characterized in that: The inner circumference of the front end of the damping valve body is provided with an 18-22° chamfer, and the end of the limiting part is provided with a 25-35° bevel.

5. The bidirectional hydraulic shock absorber damping device according to claim 1, characterized in that: A pair of radially arranged pin holes are provided at the front of the fixed sleeve. The pins pass through the pin holes to connect the fixed sleeve to the mandrel, thereby preventing the fixed sleeve from disengaging.

6. The bidirectional hydraulic shock absorber damping device according to claim 5, characterized in that: A 30° chamfer is provided on the inner circumference of the front end of the fixed sleeve.

7. The bidirectional hydraulic shock absorber damping device according to claim 1, characterized in that: Two parallel sealing ring mounting grooves are provided on the outer periphery of the middle part of the mandrel. High-pressure sealing rings are provided in the sealing ring mounting grooves to achieve a high-pressure sealing connection between the inner periphery of the damping valve body and the mandrel.

8. The bidirectional hydraulic shock absorber damping device according to claim 1, characterized in that: The outer cylinder of the hydraulic chamber has a variable diameter orifice. The chamber is composed of a first orifice, a transition section, a second orifice, a transition section, and a third orifice in sequence from the starting end to the end. The first orifice and the third orifice have the same diameter, and the diameter of the first orifice and the third orifice is larger than that of the second orifice. The transition section has a chamfered structure of 8-12° and is smoothly connected to the second orifice by rounded corners with a radius of 10-15mm.

9. The bidirectional hydraulic shock absorber damping device according to claim 1, characterized in that: The hardness of the damping valve body is less than that of the damping valve core, the fixed sleeve, the spindle, and the outer cylinder of the hydraulic chamber.

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