Speed control valve with quick-connection replaceable head

Abstract

The speed control valve comprises an upper valve body provided with a connector pipe, a lower valve body connected with the upper valve body and a control rod moving in the upper valve body and the lower valve body at the same time, a rotary knob in threaded fit with the control rod is rotationally arranged on the upper valve body, and a valve element located at the liquid outlet end is arranged in the lower valve body. An inner control rod forming an inner rod and an outer rod with the control rod is arranged on the valve element, an adjusting sleeve surrounding the control rod is arranged on the valve element, the upper end of the adjusting sleeve is arranged at the lower end of the upper valve body, and the distance between the valve element and the liquid outlet end can be automatically adjusted through self stretching and retracting according to the gas pressure when the valve is in a half-open state. A first spring located on the inner side of the adjusting sleeve is arranged on the valve element, the end, not connected with the valve element, of the first spring abuts against the lower end face of the upper valve body, a plurality of locking assemblies which are distributed in the circumferential direction of the connector pipe and are in a preset shape are arranged in the connector pipe, and the locking assemblies can lock an external pipeline inside when the connector pipe is connected into the external pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of speed control valves, in particular to a speed control valve with a quick-connect head changer. Background Art

[0002] Valves are control components in fluid delivery systems and have functions such as shutoff, regulation, flow diversion, backflow prevention, pressure stabilization, flow diversion or overflow pressure relief. Valves used in fluid control systems come in a wide variety of varieties and specifications, from the simplest shut-off valves to the various valves used in extremely complex automatic control systems.

[0003] Publication (Announcement) No.: CN206958273U discloses a hydraulic speed control valve, comprising: a control valve mounting housing, a control piston rod and an oil inlet base assembly, wherein the control piston rod is slidably mounted in the control valve mounting housing, and the oil inlet base assembly is mounted at one end of the control valve mounting housing; one end of the control piston rod is provided with a mounting thread, and the other end is provided with a sliding sleeve, the sliding sleeve is a hollow cavity structure and a side surface of one end thereof is provided with a plurality of piston oil outlet holes, the control piston rod is screwed with the control valve mounting housing through the mounting thread; the outer side of the control valve mounting housing is provided with a control oil outlet hole, and the control oil outlet hole is connected to the control valve mounting housing. The oil outlet holes of the piston are interconnected; the oil inlet base assembly includes: an oil inlet sealing sleeve, an oil inlet sealing nozzle and an oil inlet sealing steel ball, the oil inlet sealing sleeve is sleeved on one end of the oil inlet sealing nozzle, the oil inlet sealing steel ball is fixedly installed on the other end of the oil inlet sealing nozzle, an oil inlet filter is installed between the oil inlet sealing nozzle and the oil inlet sealing steel ball, and the oil inlet sealing sleeve is installed on one end of the control valve mounting housing; the sliding sleeve is sleeved on one end of the oil inlet sealing nozzle and approaches or moves away from the oil inlet sealing sleeve through the movement of the control piston rod, and the sliding sleeve abuts or disengages from the oil inlet sealing steel ball through the movement of the control piston rod. Although this speed control valve can control the entry speed of liquid oil by adjusting the gap between the sliding sleeve and the oil inlet sealing steel ball, this method has certain defects, that is, the gap needs to be adjusted by the user, so it is not adaptive. Summary of the invention

[0004] The present invention aims to solve the above-mentioned shortcomings of the prior art and provides a speed control valve with a quick-connect head changer to solve the above-mentioned problems.

[0005] The invention solves the technical problem by adopting a technical solution: the speed control valve with a quick-connect head change comprises an upper valve body provided with a joint pipe, a lower valve body connected to the upper valve body, and a control rod that moves in the upper valve body and the lower valve body at the same time, a knob that is rotatably provided on the upper valve body and matches with the control rod thread, a valve core located at the liquid outlet end is provided in the lower valve body, an inner control rod that forms an inner and outer double rod with the control rod is provided on the valve core, the inner control rod moves along the height direction of the control rod and controls the valve core to separate from the liquid outlet end of the lower valve body when the valve is in a fully open state, and a ring is provided on the valve core An adjusting sleeve is wound around the outside of the control rod, and the upper end of the adjusting sleeve is arranged at the lower end of the upper valve body. When the valve is in a half-open state, the distance between the valve core and the liquid outlet end can be automatically adjusted by its own expansion and contraction according to the size of the liquid pressure, so that the liquid flow rate is limited by the distance. A first spring is arranged on the valve core and is located on the inner side of the adjusting sleeve. The end of the first spring that is not connected to the valve core abuts against the lower end surface of the upper valve body. A plurality of locking components distributed along the circumferential direction thereof and having a preset shape are arranged in the joint pipe. When the joint pipe is connected to an external pipe, the locking component can lock the external pipe inside.

[0006] For further improvement, a rotatable grasping block is provided at the upper end of the inner control rod, a supported rod is provided on the outer circumferential surface of the grasping block, a supporting frame symmetrically distributed on both sides of the grasping block is provided on the upper end surface of the knob, a supporting groove for part of the supported rod to be placed therein is provided at the upper end of the supporting frame, and the supporting groove has an inlet in the supporting frame.

[0007] Further improvement, the valve core is nested on the inner control rod, the lower end of the inner control rod is provided with at least one external flange, and the interior of the upper end of the valve core is provided with at least one internal flange engaged with the external flange.

[0008] Further improvement, the valve core has a step configuration, and the lower end of the wide section is provided with an annular outer ring extending downward, and an annular inner ring is located above the annular outer ring and formed in the wide section, the outer circumferential surface and the inner circumferential surface of the annular outer ring form a triangular configuration, and the inner circumferential surface of the annular inner ring is an arc shape.

[0009] For further improvement, an installation groove is provided on the joint pipe, which is consistent with the arrangement of the locking components and for the corresponding locking components to be placed therein. The locking component is partially exposed outside the joint pipe through the installation groove, and abuts against the inner circumference of the outer pipe sleeve movably arranged on the outer circumference of the joint pipe, and allows the abutment to generate an extrusion force that causes the locking component to shift in a direction close to the external pipe, and after the shift, the locking component is plugged into and matched with the external pipe.

[0010] To be further improved, the locking assembly is configured as a combination of a preset shape, which is formed by bending to obtain a middle portion and side portions symmetrically distributed on both sides of the middle portion, and a plug-in structure for plugging and mating with an external pipe is formed between the middle portion and the side portions on the corresponding side, and the side portions are arranged on the inner side surface of the corresponding side of the installation groove and have an abutment structure abutting against the inner circumferential surface of the outer pipe sleeve.

[0011] Further improvement, the middle portion has a first transverse section and first oblique sections located on both sides of the first transverse section, and an angle A is formed between the first transverse section and the first oblique section, 120°≤A≤130°.

[0012] Further improvement, the side portion has a second transverse section, a second oblique section, and a third oblique section, the second transverse section is arranged on the inner side surface of the corresponding side of the installation groove, the second oblique section and the second transverse section have an angle B, 115°≤B≤125°, the third oblique section and the second oblique section have an angle C for forming an abutment structure, C=60°, the third oblique section and the first oblique section have an angle D for forming a plug-in structure, D=76°.

[0013] For further improvement, the inner circumferential surface of the outer tube sleeve is provided with inner ring grooves symmetrically distributed on both sides, and the inner ring grooves place the abutment structure inside when the outer tube sleeve moves in the unlocking direction, and allow the combination of the inner ring grooves and the abutment structure to prevent the outer tube sleeve from moving while also releasing the squeezing force of the outer tube sleeve on the locking assembly.

[0014] For further improvement, the joint pipe is in a stepped configuration, and a space is reserved between the inner side surface of the outer sleeve and the stepped surface of the joint pipe for arranging a plurality of second springs distributed along its circumferential direction, and the end of the second spring not connected to the outer sleeve is arranged on the stepped surface of the joint pipe.

[0015] The beneficial effects of the present invention are:

[0016] 1. When the valve core of the present invention is in a half-open state, it can make corresponding adaptive changes according to the pressure and flow rate of the liquid, so as to control the running speed of the piston rod of the hydraulic cylinder;

[0017] 2. The present invention completely locks the external pipe connected to the joint pipe inside through the locking component, that is, interference is generated on the moving path of the external pipe to achieve the purpose of preventing the movement of the external pipe, thus ensuring the stable connection of the external pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a partial enlarged schematic diagram of the valve core of the present invention;

[0020] Figure 3It is a structural schematic diagram of the locking assembly of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the present invention in a half-open state;

[0022] Figure 5 For the present invention Figure 4 A partial enlarged schematic diagram of part A;

[0023] Figure 6 For the present invention Figure 4 A partial enlarged schematic diagram of part B;

[0024] Figure 7 It is a structural schematic diagram of the present invention in a fully open state. DETAILED DESCRIPTION

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

[0026] Referring to the accompanying drawings: This speed control valve with a quick-connect head includes an upper valve body 11 provided with a joint pipe 2, a lower valve body 12 connected to the upper valve body 11, and a control rod 3 that moves in the upper valve body 11 and the lower valve body 12 at the same time. A knob 31 that is rotatably provided on the upper valve body 11 and is threadedly matched with the control rod 3, a valve core 4 located at the liquid outlet end is provided in the lower valve body 12, an inner control rod 5 that forms an inner and outer double rod with the control rod 3 is provided on the valve core 4, the inner control rod 5 moves along the height direction of the control rod 3 and controls the valve core 4 to separate from the liquid outlet end of the lower valve body 12 when the valve is in a fully open state, and a ring is provided on the valve core 4 An adjusting sleeve 6 is wound around the outside of the control rod 3, and the upper end of the adjusting sleeve 6 is arranged at the lower end of the upper valve body 11. When the valve is in a half-open state, the distance between the valve core 4 and the liquid outlet end can be automatically adjusted by its own expansion and contraction according to the size of the liquid pressure, so that the liquid flow rate is limited by the distance. A first spring 8 located on the inner side of the adjusting sleeve 6 is arranged on the valve core 4, and the end of the first spring 8 not connected to the valve core 4 abuts against the lower end surface of the upper valve body 11. A plurality of locking components 7 distributed along the circumferential direction thereof and having a preset shape are arranged in the joint pipe 2. The locking component 7 can lock the external pipeline inside when the joint pipe 2 is connected to the external pipeline.The principle of the present invention is that the control rod 3 moves in the moving cavity jointly formed by the upper valve body 11 and the lower valve body 12, and its movement is realized by the knob 31, that is, the control rod 3 moves downward or upward when the knob 31 is rotated forward or reversed through threaded cooperation; when the valve is in a fully closed state, the control rod 3 abuts against the valve core 4, that is, a downward pressure is applied to the valve core 4, so that the valve core is always maintained at the liquid outlet end of the lower valve body 12 in the fully closed state of the valve; when the valve is in a half-open state, the control rod 3 is moved upward by reversing the knob 31, so that the control rod 3 can release the valve core 4, so that the liquid transported to the hydraulic cylinder through the valve can push open the valve core 4 when it is discharged from the hydraulic cylinder and flows back into the valve. At the same time, in order to make the movement of the valve core 4 driven by the liquid straight up and down, an adjusting sleeve 6 is arranged on the valve core 4. The adjusting sleeve 6 is made of rubber material, and the outer peripheral surface is in a corrugated configuration, so that the adjusting sleeve 6 has the ability to adapt to the expansion and contraction changes. In this way, when the valve core 4 moves upward, the adjusting sleeve 6 can undergo corresponding compression changes. At the same time, a first spring 8 is arranged on the valve core 4. The first spring 8 also has the ability to retract when squeezed, and its compression amplitude The larger the pressure, the greater the required pressure. This makes the strength required for the compression change of the adjusting sleeve 6 not a constant value, that is, the greater the liquid pressure, the greater the distance between the valve core 4 and the liquid outlet end, the greater the liquid pressure, the slower the liquid flow rate, thereby extending the time for the liquid to return to the valve, thereby also reducing the movement speed of the piston rod of the hydraulic cylinder. Similarly, the smaller the liquid pressure, the smaller the distance between the valve core 4 and the liquid outlet end, the smaller the liquid pressure chamber, the faster the liquid flow rate. The small distance between the valve core 4 and the liquid outlet end can also achieve the purpose of throttling (that is, small flow), thereby also extending the liquid The time for returning to the valve is reduced, thereby reducing the movement speed of the piston rod of the hydraulic cylinder. This approach also enables the valve to have the ability to adapt to changes when it is in a half-open state; when the valve is in a fully open state, the control rod 3 moves up to the extreme position driven by the knob 31, and the inner control rod 5 moves up synchronously by manual means, and the inner control rod 5 is connected to the valve core 4, then the valve core 4 will also move up and abut against the lower end of the control rod 3, so that the distance between the valve core 4 and the liquid outlet is maintained at a fixed value, thereby maximizing the liquid flow back to the valve.

[0027] The upper end of the inner control rod 5 is provided with a rotatable gripping block 51, and a supported rod 51-a is provided on the outer circumference of the gripping block 51. The upper end surface of the knob 31 is provided with support frames 31-a symmetrically distributed on both sides of the gripping block 51. The upper end of the support frame 31-a is provided with a support groove 31-a1 for part of the supported rod 51-a to be placed therein, and the support groove 31-b1 has an inlet 31-a11 on the support frame 31-b. The user controls the up and down movement of the inner control rod 5 through the gripping block 51. When the valve needs to be in a fully open state, the inner control rod 5 moves upward so that the valve core 4 and the control The lower end of the control rod 3 is abutted against each other, and then the position of the supported rod 51-a is adjusted by rotating the grasping block 51. The supported rod 51-a enters the supporting groove 31-a1 from the inlet 31-a11 as the grasping block 51 rotates. The supporting frame 31-a provides lower support for the supported rod 51-a, so that the valve core 4 and the lower end of the control rod 3 are always kept in abutment, and the first spring 8 and the adjusting sleeve 6 are always in a compressed state. The distance between the valve core 4 and the liquid outlet end is maintained at a fixed distance, so that the running speed of the piston rod of the hydraulic cylinder reaches the maximum value during operation.

[0028] The valve core 4 is nested on the inner control rod 5, and at least one external flange 52 is provided at the lower end of the inner control rod 5, and at least one internal flange 41 engaged with the external flange 52 is provided inside the upper end of the valve core 4. Two external flanges 52 are provided on the inner control rod 5, and two internal flanges 41 engaged with the external flanges 52 are provided inside the valve core 4. When the inner control rod 5 moves upward, the external flange 52 and the internal flange 41 engage with or abut against each other, so that the inner control rod 5 can drive the valve core 4 to move upward, thereby allowing the valve core 4 to separate from the liquid outlet end of the lower valve body 12.

[0029] The valve core 4 is in a stepped configuration, and the lower end of the wide section thereof is provided with an annular outer ring 42 extending downward, and an annular inner ring 43 located above the annular outer ring 42 and formed in the wide section. The outer circumference and inner circumference of the annular outer ring 42 form a triangular configuration, and the inner circumference of the annular inner ring 43 is in an arc shape. Such a configuration enables the liquid to push the valve core 4 upward when the valve cavity of the upper valve body 11 and the lower valve body 12 is filled, and the valve is in a half-open state. The triangular configuration of the annular outer ring 42 enables it to have an outer guide surface 42-a and an inner guide surface 42-b. Toward surface 42-b, that is, the outer guide surface 42-a is used to guide the liquid to the bottom of the annular inner ring 43, and the inner guide surface 42-b guides the liquid to the inside of the annular inner ring 43, and the liquid fills the annular inner ring 43, so as to utilize the fluidity of the liquid to generate a thrust to push the valve core 4 upward, so that the liquid enters the hydraulic cylinder through the valve body from the liquid outlet end. This method can also be combined with the resistance provided by the first spring 8 and the adjusting sleeve 6 to extend the time for the liquid to enter the hydraulic cylinder, thereby reducing the movement speed of the piston rod of the hydraulic cylinder.

[0030] The joint pipe 2 is provided with a mounting groove 21 which is consistent with the arrangement of the locking assembly 7 and in which the corresponding locking assembly 7 is placed. The locking assembly 7 is partially exposed outside the joint pipe 2 through the mounting groove 21, and abuts against the inner circumference of the outer pipe sleeve 9 which is movably arranged on the outer circumference of the joint pipe 2, and allows the abutment to generate an extrusion force that causes the locking assembly 7 to deviate in the direction close to the external pipe, and after the displacement, the locking assembly 7 is plugged and matched with the external pipe. The mounting groove 21 allows part of the locking assembly 7 to be exposed outside the joint pipe 2, so that the locking assembly 7 can abut against the outer pipe sleeve 9 arranged on the joint pipe 2. Due to the outer pipe sleeve 9 and the joint pipe 2, the locking assembly 7 can be partially exposed outside the joint pipe 2. The space between the locking assembly 7 and the external pipe is face-to-face, so when the locking assembly 7 abuts against the inner circumferential surface of the outer pipe sleeve 9, the part of the locking assembly 7 originally exposed to the outside is forced to enter the installation groove 21, so that the locking assembly 7 is forced to move inward, and the part of the locking assembly 7 abutting against the external pipe moves inward, so that the extrusion force generated when the locking assembly 7 abuts against the external pipe is large, so that the surface of the external pipe can form a slot generated by the abutment of the locking unit 7, and the slot allows the locking unit 7 to be inserted therein, so that the locking unit 7 exists on the moving path of the external pipe, thereby interfering with the movement of the external pipe and achieving the purpose of locking the external pipe in the joint pipe 2.

[0031] The locking assembly 7 is configured as a combination of a preset shape, which is bent to obtain a middle portion 71 and side portions 72 symmetrically distributed on both sides of the middle portion 71. The middle portion 71 and the side portions 72 on the corresponding side jointly form a plug-in structure 73 for plugging and matching with an external pipe. The side portion 72 is arranged on the inner side surface of the corresponding side of the installation groove 21 and has an abutment structure 74 abutting against the inner circumferential surface of the outer pipe sleeve 9. Such an arrangement enables the locking assembly 7 to form a plug-in structure 73 and abutment structure 74 while realizing its own arrangement in the installation groove 21, so that it can be abutted and matched with the outer pipe sleeve 9 and plug-in and matched with the external pipe. The bending molding method enables the locking assembly 7 to change the bending angle when it is squeezed so that the locking assembly 7 can be deformed when it is squeezed to adapt to the requirement of being forced to deflect inward. The locking assembly 7 is made of metal material, so that the outer pipe sleeve 9 can return to its initial shape when the abutment against it is released, and the plug-in structure 73 is released from the plug-in and matching with the external pipe, thereby releasing the locking of the external pipe.

[0032] The middle portion 71 has a first transverse section 71-a and a first oblique section 71-b located on both sides of the first transverse section 71-a. An angle A is formed between the first transverse section 71-a and the first oblique section 71-b, and the angle is 120°≤A≤130°. This arrangement enables the middle portion 71 to have the ability to be deformed by extrusion, which is achieved by utilizing the angle A formed between the first transverse section 71-a and the first oblique section 71-b. Moreover, the first oblique section 71-b is also connected to the side portion 72 to form a plug-in structure 73. In this way, the plug-in structure 73 has two first transverse sections 71-a that play a connecting role and will not be deformed due to extrusion. Therefore, the first oblique section 71-b serves as the force-bearing object of the extrusion force. When it is extruded, it swings inward, and the angle A will change its own angle according to the swing. The angle A is 130° in the initial state, and the angle range gradually decreases after swinging inward, and the minimum is not less than 120°.

[0033] The side portion 72 has a second transverse section 72-a, a second oblique section 72-b, and a third oblique section 72-c. The second transverse section 72-a is arranged on the inner side surface of the corresponding side of the mounting groove 21. The second oblique section 72-b and the second transverse section 72-a have an angle B, 115°≤B≤125°, and the third oblique section 72-c and the second oblique section 72-b have an angle C, C=60°, to form abutment structure 74. The third oblique section 72-c and the first oblique section 71-b have an angle D, D=76°, to form a plug-in structure 73. Such an arrangement enables the side portion 72 to have the ability to be deformed by extrusion, and also serves as a part connected to the mounting groove 21, which is welded to the mounting groove 21 through the second transverse section 72-a. The side walls of the groove 21 are connected, and the principles of the second transverse section 72-a and the second oblique section 72-b are consistent with the principles of the first transverse section 71-a and the first oblique section 71-b. When subjected to extrusion pressure, the second oblique section 72-b swings outward, and the angle B changes its own angle according to the swing. The angle B is 110° in the initial state, and the angle range gradually increases after swinging outward, and the maximum does not exceed 125°. The third oblique section 72-c plays a connecting role, which is used to connect the first oblique section 71-b and the second oblique section 72-b, and at the same time form abutment structure 74 and a plug-in structure 73, and can also transmit the abutment structure 74 to the first oblique section 71-b when it is subjected to extrusion pressure, so that the first oblique section 71-b also swings synchronously.

[0034] The inner circumferential surface of the outer tube sleeve 9 is provided with inner annular grooves 91 symmetrically distributed on both sides. When the outer tube sleeve 9 moves in the unlocking direction, the inner annular grooves 91 place the abutment structure 74 inside, and allow the combination of the inner annular grooves 91 and the abutment structure 74 to prevent the outer tube sleeve 9 from moving while also releasing the squeezing force of the outer tube sleeve 9 on the locking assembly 7. The inner diameter of the inner annular grooves 91 is larger than the inner diameter of the outer tube sleeve 9, and when the abutment structure 74 is placed inside, it will not come into abutment contact with the abutment structure 74, so that the outer tube sleeve 9 can release the squeezing of the abutment structure 74, so that the plug-in structure 73 that was originally plugged in with the external pipe appears to only abut against the surface of the external pipe, that is, the locking restriction of the plug-in structure 73 on the external pipe is released, so that the external pipe can withdraw from the joint pipe 2.

[0035] The joint pipe 2 has a stepped configuration, and a plurality of second springs 10 distributed along the circumferential direction are reserved between the inner side surface of the outer sleeve 9 and the stepped surface of the joint pipe 2. The end of the second spring 10 that is not connected to the outer sleeve 9 is arranged on the stepped surface of the joint pipe 2. The second spring 10 can prevent the outer sleeve 9 from moving freely (rotating or moving) under non-human operation, so that the abutment structure 74 can always maintain an abutment state with the inner wall of the outer sleeve 9.

[0036] Although the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A speed control valve with a quick-connect head, comprising an upper valve body (11) provided with a joint pipe (2), a lower valve body (12) connected to the upper valve body (11), and a control rod (3) moving in the upper valve body (11) and the lower valve body (12) at the same time, and a knob (31) threadedly matched with the control rod (3) is rotatably provided on the upper valve body (11), characterized in that: The lower valve body (12) is provided with a valve core (4) located at the liquid outlet end, and the valve core (4) is provided with an inner control rod (5) which forms an inner and outer double rod with the control rod (3). The inner control rod (5) moves along the height direction of the control rod (3) and controls the valve core (4) to separate from the liquid outlet end of the lower valve body (12) when the valve is in a fully open state. The valve core (4) is provided with an adjustment sleeve (6) surrounding the outside of the control rod (3), and the upper end of the adjustment sleeve (6) is arranged at the lower end of the upper valve body (11), and allows the adjustment sleeve (6) to be adjusted according to the liquid outlet end when the valve is in a half-open state. The size of the liquid pressure automatically adjusts the distance between the valve core (4) and the liquid outlet end through its own expansion and contraction, so that the liquid flow rate is limited by the distance. The valve core (4) is provided with a first spring (8) located inside the adjustment sleeve (6). The end of the first spring (8) not connected to the valve core (4) abuts against the lower end surface of the upper valve body (11). The joint pipe (2) is provided with a plurality of locking components (7) distributed along its circumferential direction and having a preset shape. When the joint pipe (2) is connected to an external pipeline, the locking components (7) can lock the external pipeline inside.

2. The speed control valve with quick-connect head changeover according to claim 1, characterized in that: The upper end of the inner control rod (5) is provided with a rotatable gripping block (51), and the outer peripheral surface of the gripping block (51) is provided with a supported rod (51-a), and the upper end surface of the knob (31) is provided with a supporting frame (31-a) symmetrically distributed on both sides of the gripping block (51), and the upper end of the supporting frame (31-a) is provided with a supporting groove (31-a1) for part of the supported rod (51-a) to be placed therein, and the supporting groove (31-b1) has an inlet (31-a11) on the supporting frame (31-b).

3. The speed control valve with quick-connect head changeover according to claim 1, characterized in that: The valve core (4) is nested on the inner control rod (5); the lower end of the inner control rod (5) is provided with at least one external flange (52); the upper end of the valve core (4) is provided with at least one internal flange (41) engaged with the external flange (52).

4. The speed control valve with quick-connect head changeover according to claim 3, characterized in that: The valve core (4) is in a stepped configuration, and a downwardly extending annular outer ring (42) is provided at the lower end of the wide section thereof, and an annular inner ring (43) is located above the annular outer ring (42) and formed in the wide section, the outer circumferential surface and the inner circumferential surface of the annular outer ring (42) form a triangular configuration, and the inner circumferential surface of the annular inner ring (43) is in an arc shape.

5. The speed control valve with quick-connect head changeover according to claim 1, characterized in that: The joint pipe (2) is provided with a mounting groove (21) which is consistent with the arrangement of the locking components (7) and is for the corresponding locking components (7) to be placed therein. The locking components (7) are partially exposed outside the joint pipe (2) through the mounting groove (21) and abut against the inner peripheral surface of an outer pipe sleeve (9) movably arranged on the outer peripheral surface of the joint pipe (2). The abutment allows the generation of an extrusion force that causes the locking components (7) to deviate in a direction close to the external pipe, and after the deviating, the locking components (7) are plugged into and matched with the external pipe.

6. The speed control valve with quick-connect head changeover according to claim 5, characterized in that: The locking assembly (7) is configured as a combination body presenting a preset shape, wherein a middle portion (71) and side portions (72) symmetrically distributed on both sides of the middle portion (71) are obtained by bending, wherein a plug-in structure (73) for plugging and matching with an external pipe is formed between the middle portion (71) and the side portions (72) on the corresponding side, and the side portions (72) are arranged on the inner side surface of the corresponding side of the installation groove (21) and have a contact structure (74) contacting with the inner peripheral surface of the outer pipe sleeve (9).

7. The speed control valve with quick-connect head changeover according to claim 6, characterized in that: The middle portion (71) comprises a first transverse section (71-a) and first oblique sections (71-b) located on both sides of the first transverse section (71-a), and an angle A is formed between the first transverse section (71-a) and the first oblique section (71-b), wherein 120°≤A≤130°.

8. The speed control valve with quick-connect head changeover according to claim 7, characterized in that: The side portion (72) comprises a second transverse section (72-a), a second oblique section (72-b), and a third oblique section (72-c), wherein the second transverse section (72-a) is arranged on the inner side surface of the corresponding side of the mounting groove (21), an angle B is formed between the second oblique section (72-b) and the second transverse section (72-a), and the angle C is 60° between the third oblique section (72-c) and the second oblique section (72-b) to form the abutment structure (74), and the angle D is 76° between the third oblique section (72-c) and the first oblique section (71-b) to form the plug-in structure (73).

9. The speed control valve with quick-connect head changeover according to claim 8, characterized in that: The inner circumferential surface of the outer tube sleeve (9) is provided with inner annular grooves (91) symmetrically distributed on both sides, and the inner annular grooves (91) are arranged so that the abutment structure (74) is placed inside when the outer tube sleeve (9) moves in the unlocking direction, and the combination of the inner annular grooves (91) and the abutment structure (74) allows the outer tube sleeve (9) to be prevented from moving while also releasing the squeezing force of the outer tube sleeve (9) on the locking assembly (7).

10. The speed control valve with quick-connect head changeover according to claim 9, characterized in that: The joint pipe (2) is in a stepped configuration, and a space is reserved between the inner side surface of the outer pipe sleeve (9) and the stepped surface of the joint pipe (2) for arranging a plurality of second springs (10) distributed along the circumferential direction thereof, and an end of the second spring (10) not connected to the outer pipe sleeve (9) is arranged on the stepped surface of the joint pipe (2).

Images