SE546044C2 - Connection structure for actuator and valve - Google Patents

Abstract

ABSTRACT The present disclosure relates to a connection structure for an actuator and a valve, the actuator comprising a housing (1), the valve comprising a valve body (10), and the connection structure comprising a connecting tube (2) adapted to be arranged on the housing (1) and a connecting neck (10a) adapted to be arranged on the valve body (10), the connecting tube (2) being connected to the connecting neck (10a) in a sheathing fashion, wherein a slide sleeve (4) capable of sliding in an axial direction is fitted round the outside of the connecting tube (2), and an elastic member (5) capable of driving the slide sleeve (4) to slide toward the valve body (10) is provided between the slide sleeve (4) and the housing (1); after sliding toward the valve body (10), the slide sleeve (4) can engage the connecting tube (2) on the connecting neck (10a), and an axial gap (6) is formed between the slide sleeve (4) and the housing (1); a locking member (9) capable of sliding in a radial direction ofthe connecting tube (2) is engageable on the housing (1); and after the locking member (9) has slid toward the connecting tube (2), the locking member (9) is insertable into the axial gap (6) and lockable on the housing (1).

Description

Technical field The present invention relates to a connection structure for an actuator and a valve, in the technical field of valves.

Background art Valves are a group of mechanical products having movable mechanisms and used to control media in pipelines. Valves are classified according to the way in which they are driven, and include manual valves, electrically operated valves, and hydraulic or pneumatic valves. Electrically operated valves are valves operated using an electrical operation device, an electromagnetic or other electrical device, wherein the device that operates the valve is also called an actuator.

A remote transmission intelligent regulating valve has been disclosed in the Chinese patent literature [application no.: CN201922069702.6; announcement no.: CN210889643U], comprising a valve and an actuator; an extension boss and a positioning boss are provided in a protruding fashion in sequence toward the outside in a middle region of the valve, a positioning protruding sleeve in which the positioning boss and extension boss can extend into is provided on the actuator, the positioning protruding sleeve on the actuator and the positioning boss on the valve are connected together in a fixed manner by means of an insertion pin, an annular groove is provided in a radially inward fashion in a peripheral wall of the positioning boss, the insertion pin runs through the positioning protruding sleeve and passes through the annular groove and abuts groove walls ofthe annular groove, and the extension boss and positioning protruding sleeve are connected together in a fixed manner by means of an engagement component.

The actuator is fixed to the valve by means ofthe insertion pin; when mounting is carried out, the insertion pin simply needs to be inserted directly. However, the insertion pin has no positioning structure, and can be easily pulled out, thus the reliability of connection between the actuator and the valve is inadequate.

Summary The objective of at least embodiments of the present invention is to propose, in response to the abovementioned problem in the known art, a connection structure for an actuator and a valve, which solves the technical problem of inadequate reliability of connection between existing actuators and valves.The objective ofthe present invention can be achieved through the following technical solutions: A connection structure for an actuator and a valve, the actuator comprising a housing, the valve comprising a valve body, and the connection structure comprising a connecting tube arranged on the housing and a connecting neck arranged on the valve body, the connecting tube being connected to the connecting neck in a sheathing fashion, characterized in that a slide sleeve capable of sliding in an axial direction is fitted round the outside ofthe connecting tube, and an elastic member capable of driving the slide sleeve to slide toward the valve body is provided between the slide sleeve and the housing; after sliding toward the valve body, the slide sleeve can engage the connecting tube on the connecting neck, and an axial gap is formed between the slide sleeve and the housing; a locking member capable of sliding in a radial direction of the connecting tube is engaged on the housing; and after the locking member has slid toward the connecting tube, the locking member is insertable into the axial gap and lockable on the housing.

To connect the actuator to the valve, first of all the slide sleeve is slid toward the housing against the elastic force of the elastic member; the connecting tube is then fitted round the connecting neck; the slide sleeve is then released; the slide sleeve slides toward the valve body under the action of the elastic member; once the slide sleeve has slid toward the valve body, the connecting tube is engaged on the connecting neck, thereby fixing the actuator on the valve, and the axial gap is formed between the slide sleeve and the housing; the locking member is then slid toward the connecting tube, such that the locking member is inserted into the axial gap, and at the same time, the locking member is locked on the housing.

The insertion ofthe locking member into the axial gap limits the slide sleeve in the axial direction, preventing the slide sleeve from sliding toward the housing and releasing the state of engagement between the connecting tube and the connecting neck, and the locking member will be locked on the housing after being inserted into the axial gap, such that the locking member cannot slide out of the axial gap randomly; thus, the configuration ofthe locking member ensures that a fixed state can be stably maintained between the connecting tube and the connecting neck. I\/|oreover, the elastic force produced by the elastic member causes the connecting tube to maintain its state after sliding toward the valve body; even if the locking member is pulled out of the axial gap, the slide sleeve can be slid toward the housing in order to release the state of engagement between the connecting tube and the connecting neck only if a pushing or pulling force capable of overcoming the elastic force ofthe elastic member is applied. Thus, theconfiguration of the elastic member also helps to ensure a stable fixed state between the connecting tube and the connecting neck.

When it is necessary to detach the actuator from the valve, first of all the locked state ofthe locking member needs to be released and the locking member needs to be slid out of the axial gap, and a certain amount of force is then applied to slide the slide sleeve toward the housing against the elastic force ofthe elastic member. lf a mistake is made in the sequence, for example if the slide sleeve is pushed or pulled when the locking member has not been pulled out ofthe axial gap, the slide sleeve will not be able to slide toward the housing, and will not be able to release the fixed state between the connecting tube and the connecting neck. Only the correct dismantling sequence will be able to detach the actuator from the valve, so it is possible to effectively avoid detachment of the actuator from the valve due to erroneous operation.

Thus, in the connection structure for an actuator and a valve described herein, two detachment prevention structures may be formed by providing the elastic member and the locking member, and the dismantling operation can be completed only if performed in the correct sequence, while it is also necessary to use a certain amount of force; thus, the difficulty of dismantling is increased, the likelihood of erroneous dismantling is reduced, and the reliability of connection between the actuator and the valve is thereby increased. ln the connection structure for an actuator and a valve as described above, a protruding engagement block may be provided on the housing, with an engagement groove being provided on the engagement block; the locking member may be inserted into the engagement groove and may be slidable along the engagement groove.

Once the engagement groove has been provided, the locking member is not only able to slide along the engagement groove and thereby be inserted into the axial gap to limit the slide sleeve in the axial direction, but is also engaged on the engagement block by means of the engagement groove and will not fall out, thus ensuring the axial limitation action ofthe locking member on the slide sleeve, and helping to increase the reliability of connection between the actuator and the valve. ln the connection structure for an actuator and a valve as described above, the engagement block may further be provided with a sunken locking indentation, and a protruding locking protrusion capable of being inserted into the locking indentation may be provided on the locking member; when the locking protrusion is inserted into the locking indentation, the locking member may be inserted into the axial gap.The locking member may be locked on the housing by means ofthe locking indentation and the locking protrusion, preventing the locking member from sliding out of the axial gap randomly, thus ensuring the axial limitation action ofthe locking member on the slide sleeve, and helping to increase the reliability of connection between the actuator and the valve. ln the connection structure for an actuator and a valve as described above, the locking member may be provided with a strip-shaped sliding recess, the engagement block being inserted into the sliding recess; two said engagement grooves may be provided, located on two sides of the engagement block respectively, and two sidewalls ofthe sliding recess may be inserted into the corresponding engagement grooves.

The two sides of the locking member may be limited by means of the engagement grooves located on two sides of the engagement block, such that the locking member is engaged more stably on the engagement block, and will not easily disengage from the engagement block in the process of sliding, thus ensuring the axial limitation action ofthe locking member on the slide sleeve, and helping to increase the reliability of connection between the actuator and the valve. ln the connection structure for an actuator and a valve as described above, two said locking indentations may be provided, located on two sides of the engagement block respectively, and two said locking protrusions may be provided, arranged in one-to-one correspondence with the locking indentations. ln this way, the locking member may be locked on the engagement block more stably by means of two pairs of locking protrusions and locking indentations, to better ensure that the locking member will not slide randomly, thereby better ensuring the axial limitation action ofthe locking member on the slide sleeve, and helping to increase the reliability of connection between the actuator and the valve. ln the connection structure for an actuator and a valve as described above, the engagement block may be provided with a guide groove in a radial direction of the connecting tube, and a guide strip inserted into the guide groove may be provided on the locking member.

The guide groove and guide strip may have a guiding function, causing the locking member to slide in a radial direction of the connecting tube, thus enabling the locking member to be accurately inserted into the axial gap to limit the slide sleeve in the axial direction, and helping to increase the reliability of connection between the actuator and the valve. ln the connection structure for an actuator and a valve as described above, the engagement block may further be provided with a sunken sliding indentationand a sunken positioning indentation, the locking protrusion being insertable into the sliding indentation and the positioning indentation; when the locking protrusion is inserted into the positioning indentation, the locking member may be disengaged from the axial gap; and the sliding indentation may be located between the locking indentation and the positioning indentation.

The sliding indentation may have an avoiding function, preventing the locking member from becoming jammed on the engagement block, so that the locking member slides smoothly on the engagement block. The positioning indentation has a positioning function, preventing the locking member from sliding out of the housing to too great an extent, and thereby facilitating the operation of sliding the locking member. ln the connection structure for an actuator and a valve as described above, the locking member may be Y-shaped, the locking member comprising a driving handle in the form of a straight handle and a limiting part which is arc-shaped or V- shaped; the driving handle may be inserted into the engagement groove, the limiting part may be located on an end of the driving handle which is close to the connecting tube, and the limiting part may be insertable into the axial gap.

Configuring the locking member in this way may enable a greater part thereof to enter the axial gap, thereby stabilizing the axial limitation action of the locking member on the slide sleeve, and helping to increase the reliability of connection between the actuator and the valve. ln the connection structure for an actuator and a valve as described above, a protruding force application protrusion may be provided on an end ofthe driving handle which is remote from the connecting tube.

The force application protrusion may make it easier to push the locking member into the axial gap. When it is really necessary to detach the actuator from the valve, the force application protrusion enables the locking member to have a force application point when being pulled out ofthe axial gap, so that the locking member can be pulled out more conveniently. ln the connection structure for an actuator and a valve as described above, an outside face of the connecting neck may be provided with an annular groove, a protruding stop ring may be provided on an inside face of the slide sleeve, and an outside face ofthe connecting tube may be provided with a shoulder and a fixing groove, the fixing groove being close to the valve body, and the stop ring being located between the shoulder and the fixing groove; a retaining ring may be fixed in the fixing groove, and a sidewall ofthe connecting tube may be provided with multiple through-holes in a circumferential direction, the through-holes beinglocated between the fixing groove and the shoulder, and a ball being mounted in each through-hole; the elastic member may be a compression spring, and the elastic member may be fitted round the outside of the connecting tube, with two ends of the elastic member being in abutment with the stop ring and the shoulder respectively; under the action ofthe elastic force of the elastic member, the stop ring may abut the retaining ring, and the stop ring may block outer end openings of the through-holes so that inside parts of the balls are inserted into the annular groove.

Once the slide sleeve has slid downward under the driving action of the elastic member, the connecting tube can be engaged in the connecting neck by means of the balls and the annular groove. When it is necessary to separate the actuator and the valve, the slide sleeve needs to be slid toward the housing against the elastic force ofthe elastic member, such that the stop ring separates from the outer end openings of the through-holes; this enables the balls to come out of the annular groove, and separation is thereby achieved. When the slide sleeve is subsequently released, the stop ring returns to its former position to block the outer end openings of the through-holes, and pushes the balls back into the annular groove, thus being able to achieve engagement connection again.

Compared with the prior art, at least embodiments ofthe present invention have the following advantages: The locking member is provided on the housing of the actuator to limit the slide sleeve in the axial direction, enabling a stable fixed state to be maintained between the connecting tube and the connecting neck, thus reducing separation of the actuator and the valve due to erroneous operation, and increasing the reliability of connection between the actuator and the valve. The engagement groove is provided on the engagement block, and the locking member is inserted into the engagement groove, thus achieving slidable engagement, and ensuring that the locking member will not disengage from the housing. The locking indentation and locking protrusion are provided, so that the locking member is locked in position after being inserted into the axial gap, and will not slide randomly, thus ensuring the axial positioning action ofthe locking member on the slide sleeve; and the configuration of the guide groove and guide strip enables the locking member to slide accurately on the housing, so that the locking member is inserted into the axial gap accurately. All of these help to increase the reliability of connection between the actuator and the valve. The force application protrusion is provided on the locking member, and the sliding indentation and positioning indentation are provided on the engagement block, to facilitate the operation of sliding the locking member.

Brief description of the drawings Fig. 1 is a three-dimensional drawing of a first embodiment of the connection structure.

Fig. 2 is a three-dimensional drawing of the first embodiment of the connection structure in a dismantled state.

Fig. 3 is a first longitudinal sectional view of the first embodiment of the connection structure.

Fig. 4 is a second longitudinal sectional view of the first embodiment of the connection structure.

Fig. 5 is a sectional drawing in direction A-A in Fig.

Fig. 6 is a partial three-dimensional drawing ofthe housing in the first embodiment ofthe connection structure.

Detailed description The following are particular embodiments of the present invention, which further describe the technical solutions of the present invention in conjunction with the drawings, but the present invention is not limited to these embodiments.

Figs. 1 - 6 show a first embodiment of a connection structure for an actuator and a valve, the actuator comprising a housing 1, the valve comprising a valve body 10, and the connection structure comprising a connecting tube 2 arranged on the housing 1 and a connecting neck 10a arranged on the valve body 10. An accommodating recess 1a that is sunk in an upward direction is provided in a lower end face ofthe housing 1. The connecting tube 2 is arranged on a bottom face of the accommodating recess 1a and protrudes downward from the lower end face ofthe housing 1. The connecting neck 10a is arranged on an upper end face ofthe valve body 10 and protrudes upward. The connecting tube 2 is fitted round the outside of the connecting neck 10a. A lower end face ofthe connecting tube 2 is provided with a positioning slot 2a at a peripheral side of an inner hole of the connecting tube 2, and a positioning protrusion 10c corresponding to the positioning slot 2a is provided on the connecting neck 10a. The positioning protrusion 10c is inserted into the positioning slot 2a to fix the connecting tube 2 on the connecting neck 10a circumferentially. Two positioning protrusions 10c are provided, arranged symmetrically; and four positioning slots 2a are provided, distributed evenly in a circumferential direction. An outside face at an upper end ofthe connecting neck 10a is provided with a circumferential positioning indentation. The circumferential positioning indentation runs upward through an upper end face ofthe connectingneck 10a, and a bottom face of the circumferential positioning indentation is a flat surface. A circumferential positioning projection arranged to correspond to the circumferential positioning indentation is provided on an inside face of the inner hole ofthe connecting tube 2. An inside face ofthe circumferential positioning projection is a flat surface, and the circumferential positioning projection is inserted into the circumferential positioning indentation. The bottom face ofthe circumferential positioning indentation abuts the inside face ofthe circumferential positioning projection, such that the connecting tube 2 and connecting neck 10a are accurately positioned in the circumferential direction.

The connection structure may further comprise a slide sleeve 4, an elastic member 5 and a locking member The slide sleeve 4 capable of sliding in an axial direction is fitted round the outside of the connecting tube 2, and the elastic member 5 capable of driving the slide sleeve 4 to slide toward the valve body 10 is provided between the slide sleeve 4 and the housing 1. After sliding toward the valve body 10, the slide sleeve 4 can engage the connecting tube 2 on the connecting neck 10a, and an axial gap 6 is formed between the slide sleeve 4 and the housing 1. An outside face of the connecting neck 10a is provided with an annular groove 10b. A protruding stop ring 4a is provided on an inside face of the slide sleeve 4; and an outside face ofthe connecting tube 2 is provided with a shoulder 2b and a fixing groove 2c. The fixing groove 2c is close to the valve body 10, and the stop ring 4a is located between the shoulder 2b and the fixing groove 2c. A retaining ring 7 is fixed in the fixing groove 2c; the retaining ring 7 is annular with an opening, and is elastic, to facilitate the fitting of the slide sleeve 4. A sidewall of the connecting tube 2 is provided with multiple through-holes 2d, distributed evenly in the circumferential direction. The through-holes 2d are located between the fixing groove 2c and the shoulder 2b, and a ball 8 is mounted in each through-hole 2d. The elastic member 5 may be a compression spring, and the elastic member 5 is fitted round the outside ofthe connecting tube 2, with two ends of the elastic member 5 being in abutment with the stop ring 4a and the shoulder 2b respectively. Under the action ofthe elastic force ofthe elastic member 5, the stop ring 4a abuts the retaining ring 7, and the stop ring 4a blocks outer end openings ofthe through-holes 2d so that the balls 8 are inserted into the annular groove 10b. An obliquely arranged guide face is provided on a lower end face ofthe stop ring 4a. The balls 8 are pushed by means of the guide face, to prevent jamming between the stop ring 4a and the balls 8. An upper end ofthe slide sleeve 4 is inserted into the accommodating recess la. When the slide sleeve 4 slides on the connecting tube 2, the upper end ofthe slide sleeveis always located in the accommodating recess la. A protruding limiting ring 4b is provided on an outside face of the slide sleeve 4. the limiting ring 4b is located below the housing 1, and when the stop ring 4a of the slide sleeve 4 abuts the retaining ring 7, the axial gap 6 is formed between an upper end face of the limiting ring 4b and the lower end face ofthe housing 1. A protruding force application ring 4c is provided on an outside face of the limiting ring 4b. The force application ring 4c allows a user to conveniently grip the slide sleeve 4 so as to subject the slide sleeve 4 to a sliding operation. An inner hole of the stop ring 4a of the slide sleeve 4 is a spline hole, and the outside face ofthe connecting tube 2 has a spline which fits the spline hole. The fitting of the spline hole to the spline fixes the slide sleeve 4 circumferentially, so the axial sliding ofthe slide sleeve 4 is stable and accurate.

The locking member 9 capable of sliding in a radial direction of the connecting tube 2 is engaged on the lower end face of the housing 1. After the locking member 9 has slid toward the connecting tube 2, the locking member 9 is able to be inserted into the axial gap 6 and locked on the housing 1. The locking member 9 may be Y-shaped, the locking member 9 comprising a driving handle 9a in the form of a straight handle and a limiting part 9b which is arc-shaped or V-shaped. The limiting part 9b is located on an end of the driving handle 9a which is close to the connecting tube 2, and the limiting part 9b is insertable into the axial gap 6. A protruding force application protrusion 9c is provided on an end of the driving handle 9a which is remote from the connecting tube 2. A protruding engagement block 3 is provided on the lower end face of the housing 1, with an engagement groove 3a being provided on a side face of the engagement block 3. A strip-shaped sliding recess 9a1 extending in a radial direction of the connecting tube 2 is provided in the driving handle 9a. The engagement block 3 is inserted into the sliding recess 9a1, with a sidewall ofthe sliding recess 9a1 being inserted into the engagement groove 3a, and the locking member 9 is able to slide along the engagement groove 3a. An end ofthe engagement block 3 which is remote from the connecting tube 2 is provided with a guide groove 3b in a radial direction ofthe connecting tube 2, and a guide strip 9a2 inserted into the guide groove 3b is provided on a groove wall face of the sliding recess 9a1 at a side remote from the connecting tube 2, the guide strip 9a2 being slidable in the guide groove 3b. A side face ofthe engagement block 3 is further provided with a sunken locking indentation 3c, a sunken sliding indentation 3d and a sunken positioning indentation 3e. The sliding indentation 3d is located between the locking indentation 3c and the positioning indentation 3e, and the locking indentation 3c is closer to the connecting tube 2. A protruding locking protrusion 9a3 is provided on a side wall face of the sliding recess 9a1. The locking protrusion 9a3 is insertable into the locking indentation 3c, sliding indentation 3d and positioning indentation 3e. When the locking protrusion 9a3 is inserted into the locking indentation 3c, the limiting part 9b of the locking member 9 is inserted into the axial gap 6. When the locking protrusion 9a3 is inserted into the positioning indentation 3e, the limiting part 9b ofthe locking member 9 is disengaged from the axial gap 6. To facilitate machining ofthe locking indentation 3c, sliding indentation 3d and positioning indentation 3e, the locking indentation 3c, sliding indentation 3d and positioning indentation 3e all run downward through a lower end face of the engagement block 3, and divide one engagement groove 3a into two sub-grooves, with the locking indentation 3c, sliding indentation 3d and positioning indentation 3e being located between the two sub-grooves. ln order to enable the locking protrusion 9a3 to be inserted into the locking indentation 3c, sliding indentation 3d and positioning indentation 3e, the locking member 9 may itself have a certain degree of elasticity. The locking member 9 may be made of a metal material, such as iron or aluminum material, or be made of plastic, and can thus not only maintain its own structure but also undergo a certain amount of elastic deformation to allow the locking protrusion 9a3 to be inserted into the locking indentation 3c, sliding indentation 3d and positioning indentation 3e. Alternatively, the locking protrusion 9a3 is elastic. For example, the locking protrusion 9a3 is bent from a spring plate to form a protruding arch shape, such that the locking protrusion 9a3 is able to undergo a certain amount of elastic deformation and be smoothly inserted into the locking indentation 3c, sliding indentation 3d and positioning indentation 3e. Two engagement grooves 3a are provided, located on two sides of the engagement block 3 respectively. Two sidewalls of the sliding recess 9a1 are inserted into the corresponding engagement grooves 3a. Two locking indentations 3c are provided, located on two sides of the engagement block 3 respectively, and two locking protrusions 9a3 are provided, arranged in one-to-one correspondence with the locking indentations 3c. Furthermore, two sliding indentations 3d are provided, located on two sides of the engagement block 3 respectively, and two positioning indentations 3e are provided, located on two sides ofthe engagement block 3 respectively.

To connect the actuator to the valve, first of all the slide sleeve 4 is slid upward against the elastic force of the elastic member 5, and the upper end face of the limiting ring 4b of the slide sleeve 4 abuts the lower end face of the housing 1. The connecting tube 2 is then fitted round the connecting neck 10a, such that the positioning protrusion 10c is inserted into the positioning slot 2a. The slide sleeveis then released; the slide sleeve 4 slides downward under the action of the elasticmember 5, and the stop ring 4a abuts the retaining ring 7. The stop ring 4a pushes the balls 8, causing inside parts ofthe balls 8 to enter the annular groove 10b. The connecting tube 2 is thus engaged on the connecting neck 10a, thereby fixing the actuator on the valve, and the axial gap 6 is formed between the upper end face of the limiting ring 4b of the slide sleeve 4 and the lower end face ofthe housing 1. The locking member 9 is then slid toward the connecting tube 2, such that the limiting part 9b of the locking member 9 is inserted into the axial gap 6, and at the same time, the locking protrusion 9a3 on the locking member 9 is inserted into the locking indentation 3c of the engagement block 3, thus locking the locking member 9 on the housing 1. The insertion ofthe limiting part 9b of the locking member 9 into the axial gap 6 limits the slide sleeve 4 in the axial direction, preventing the slide sleeve 4 from sliding upward and releasing the state of engagement between the connecting tube 2 and the connecting neck 10a, and the locking member 9 will be locked on the housing 1 by means of the locking protrusion 9a3 and locking indentation 3c after being inserted into the axial gap 6, such that the locking member 9 cannot slide out of the axial gap 6 randomly. Thus, the configuration ofthe locking member 9 ensures that a fixed state can be stably maintained between the connecting tube 2 and the connecting neck 10a. I\/|oreover, the elastic force produced by the elastic member 5 causes the connecting tube 2 to maintain the position in which the stop ring 4a abuts the retaining ring 7, such that the stop ring 4a keeps the outer end openings of the through-holes 2d blocked. Even if the locking member 9 is pulled out of the axial gap 6, the slide sleeve 4 can be slid upward in order to release the state of engagement between the connecting tube 2 and the connecting neck 10a only if a pushing or pulling force capable of overcoming the elastic force of the elastic member 5 is applied. Thus, the configuration ofthe elastic member 5 also helps to ensure a stable fixed state between the connecting tube 2 and the connecting neck 10a. When it is necessary to detach the actuator from the valve, first of all the locking member 9 needs to be slid; a certain amount of force needs to be used to cause the locking protrusion 9a3 on the locking member 9 to disengage from the locking indentation 3c, slide through the sliding indentation 3d and then enter the positioning indentation 3e, at which time the locking member 9 has slid out ofthe axial gap 6. A certain amount of force is then applied again to slide the slide sleeve 4 upward against the elastic force of the elastic member 5; the upper end face ofthe limiting ring 4b of the slide sleeve 4 abuts the lower end face of the housing 1, eliminating the axial gap 6, at which time the stop ring 4a on the slide sleeveleaves the outer end openings ofthe through-holes 2d, and the balls 8 are able todisengage from the annular groove 10b. The state of engagement between the connecting tube 2 and the connecting neck 10a is released, and the actuator can be detached from the valve by pulling the connecting tube 2 offthe connecting neck 10a. lf a mistake is made in the dismantling sequence, for example ifthe slide sleeve 4 is pushed or pulled when the locking member 9 has not been pulled out of the axial gap 6, the slide sleeve 4 will not be able to slide upward, and will not be able to release the fixed state between the connecting tube 2 and the connecting neck 10a. Only the correct dismantling sequence will be able to detach the actuator from the valve, so it is possible to effectively avoid detachment of the actuator from the valve due to erroneous operation. Thus, in the connection structure for an actuator and a valve described herein, two detachment prevention structures are formed by providing the elastic member 5 and the locking member 9, and the dismantling operation can be completed only if performed in the correct sequence, while it is also necessary to use a certain amount of force; thus, the difficulty of dismantling is increased, the likelihood of erroneous dismantling is reduced, and the reliability of connection between the actuator and the valve is thereby increased. ln a second embodiment, the structure of engagement between the engagement block 3 and the locking member 9 is different from that in the first embodiment, but the other structures are the same as those in the first embodiment described above with reference to figs. 1-6. 1. A strip-shaped recess is provided on an operating handle of the locking member 9. The strip-shaped recess has an opening at an end close to the connecting tube 2, and the opening splits the limiting part 9b in half, such that the operating handle has a certain degree of elasticity. An engagement groove 3a, which is arranged in a radial direction ofthe connecting tube 2, is provided in the middle of the engagement block 3; the operating handle is inserted into the engagement groove 3a and is slidable along the engagement groove 3a. A sidewall face of the engagement groove 3a is provided with a locking indentation 3c, and a locking protrusion 9a3 corresponding to the locking indentation 3c is provided on a side face ofthe operating handle. When the locking protrusion 9a3 is inserted into the locking indentation 3c, the limiting part 9b is inserted into the axial gap 6. ln a third embodiment, the structure of engagement ofthe slide sleeve 4, the connecting tube 2 and the connecting neck 10a, and the mounting position ofthe elastic member 5, are different from those in the first embodiment, but the other structures are the same as those in the first embodiment described above with reference to figs. 1-6. An annular groove 10b is provided on an outside face ofthe connecting neck 10a. An inside face of the connecting tube 2 is provided withmultiple blind holes, distributed evenly in the circumferential direction. A spring and a pin are inserted in each blind hole, with two ends ofthe spring abutting a bottom face of the blind hole and the pin respectively. Under the action of the elastic force of the spring, one end of the pin projects from the blind hole and is inserted into the annular groove l0b, the other end of the pin being located in the blind hole. The pin is made of a magnetic material, such as iron or an iron-nickel alloy, etc., and a magnetic ring arranged to correspond to the pin is provided on the slide sleeve 4. When the slide sleeve 4 is in abutment with the retaining ring 7 after sliding downward, the magnetic ring and the pin are offset from one another, and an attractive force enabling the pin to overcome the elastic force of the spring cannot be generated between the magnetic ring and the pin, so the pin remains in a state in which one end thereof is located in the annular groove l0b while the other end thereof is located in the blind hole. When the slide sleeve 4 slides upward such that the limiting ring 4b abuts the lower end face ofthe housing l, the magnetic ring is opposite the pin, and a magnetic force enabling the pin to overcome the elastic force ofthe spring can be generated between the magnetic ring and the pin, so the pin slides toward the bottom face ofthe blind hole and disengages from the annular groove l0b. The elastic member 5 is a compression spring fixed in the accommodating recess la, with two ends ofthe compression spring abutting the bottom face ofthe accommodating recess la and an upper end face ofthe slide sleeve 4. the elastic member 5 may also be a tension spring; two tension springs are provided, arranged symmetrically, with one end of each tension spring being fixed to the slide sleeve 4 and the other end of each tension spring being fixed to the valve body The particular embodiments described herein are merely examples for explaining the spirit of the present invention. Those skilled in the art could make various amendments or additions to the particular embodiments described or replace them with similar arrangements, without deviating from the spirit ofthe present invention or exceeding the scope defined in the attached claims. ln the drawings, l - housing; la - accommodating recess; 2 - connecting tube; 2a - positioning slot; 2b - shoulder; 2c - fixing groove; 2d - through-hole; 3 - engagement block; 3a - engagement groove; 3b - guide groove; 3c - locking indentation; 3d - sliding indentation; 3e - positioning indentation; 4 - slide sleeve; 4a - stop ring; 4b - limiting ring; 4c -force application ring; 5 - elastic member; 6 - axial gap; 7 - retaining ring; 8 - ball; 9 - locking member; 9a - driving handle; 9al - sliding recess; 9a2 - guide strip; 9a3 - locking protrusion; 9b - limiting part; 9c -force application protrusion; 10 - valve body; 10a - connecting neck;10b - annular groove; 10c - positioning protrusion.

Examples 1. A connection structure for an actuator and a valve, the actuator comprising a housing (1), the valve comprising a valve body (10), and the connection structure comprising a connecting tube (2) arranged on the housing (1) and a connecting neck (10a) arranged on the valve body (10), the connecting tube (2) being connected to the connecting neck (10a) in a sheathing fashion, characterized in that a slide sleeve (4) capable of sliding in an axial direction is fitted round the outside of the connecting tube (2), and an elastic member (5) capable of driving the slide sleeve (4) to slide toward the valve body (10) is provided between the slide sleeve (4) and the housing (1); after sliding toward the valve body (10), the slide sleeve (4) can engage the connecting tube (2) on the connecting neck (10a), and an axial gap (6) is formed between the slide sleeve (4) and the housing (1); a locking member (9) capable of sliding in a radial direction of the connecting tube (2) is engaged on the housing (1); and after the locking member (9) has slid toward the connecting tube (2), the locking member (9) is insertable into the axial gap (6) and lockable on the housing (1). 2. The connection structure for an actuator and a valve as in example 1, characterized in that a protruding engagement block (3) is provided on the housing (1), with an engagement groove (3a) being provided on the engagement block (3), the locking member (9) is inserted into the engagement groove (3a) and is slidable along the engagement groove (3a). 3. The connection structure for an actuator and a valve as in example 2, characterized in that the engagement block (3) is further provided with a sunken locking indentation (3c), and a protruding locking protrusion (9a3) capable of being inserted into the locking indentation (3c) is provided on the locking member (9); when the locking protrusion (9a3) is inserted into the locking indentation (3c), the locking member (9) is inserted into the axial gap (6). 4. The connection structure for an actuator and a valve as in example 3, characterized in that the locking member (9) is provided with a strip-shaped sliding recess (9a1), the engagement block (3) being inserted into the sliding recess (9a1); two said engagement grooves (3a) are provided, located on two sides of the engagement block (3) respectively, and two sidewalls of the sliding recess (9a1) are inserted into the corresponding engagement grooves (3a).

. The connection structure for an actuator and a valve as in example 4, characterized in that two said locking indentations (3c) are provided, located on two sides of the engagement block (3) respectively, and two said locking protrusions (9a3) are provided, arranged in one-to-one correspondence with the locking indentations (3c). 6. The connection structure for an actuator and a valve as in any one of examples 2 - 5, characterized in that the engagement block (3) is provided with a guide groove (3b) in a radial direction of the connecting tube (2), and a guide strip (9a2) inserted into the guide groove (3b) is provided on the locking member (9). 7. The connection structure for an actuator and a valve as in any one of examples 3 - 5, characterized in that the engagement block (3) is further provided with a sunken sliding indentation (3d) and a sunken positioning indentation (3e), the locking protrusion (9a3) being insertable into the sliding indentation (3d) and the positioning indentation (3e); when the locking protrusion (9a3) is inserted into the positioning indentation (3e), the locking member (9) is disengaged from the axial gap (6), and the sliding indentation (3d) is located between the locking indentation (3c) and the positioning indentation (3e). 8. The connection structure for an actuator and a valve as in any one of examples 2 - 5, characterized in that the locking member (9) is Y-shaped, the locking member (9) comprising a driving handle (9a) in the form of a straight handle and a limiting part (9b) which is arc-shaped or V-shaped; the driving handle (9a) is inserted into the engagement groove (3a), the limiting part (9b) is located on an end of the driving handle (9a) which is close to the connecting tube (2), and the limiting part (9b) is insertable into the axial gap (6). 9. The connection structure for an actuator and a valve as in example 8, characterized in that a protruding force application protrusion (9c) is provided on an end of the driving handle (9a) which is remote from the connecting tube (2).

. The connection structure for an actuator and a valve as in any one of examples 1 - 5, characterized in that an outside face of the connecting neck (10a) is provided with an annular groove (10b), a protruding stop ring (4a) is provided on an inside face of the slide sleeve (4), and an outside face ofthe connecting tube (2) is provided with a shoulder (2b) and a fixing groove (2c), the fixing groove (2c) being close to the valve body (10), and the stop ring (4a) being located between the shoulder (2b) and the fixing groove (2c); a retaining ring (7) is fixed in the fixing groove (2c), and a sidewall ofthe connecting tube (2) is provided with multiple through-holes (2d) in a circumferential direction, the through-holes (2d) being located between the fixing groove (2c) and the shoulder (2b), and a ball (8) beingmounted in each through-hole (2d); the elastic member (5) is a compression spring, and the elastic member (5) is fitted round the outside of the connecting tube (2), with two ends of the elastic member (5) being in abutment with the stop ring (4a) and the shoulder (2b) respectively; under the action ofthe elastic force ofthe elastic member (5), the stop ring (4a) abuts the retaining ring (7), and the stop ring (4a) blocks outer end openings of the through-holes (2d) so that inside parts of the balls (8) are inserted into the annular groove (10b).

Claims (10)

1. A connection structure for an actuator and a valve, the actuator comprising a housing (1), the valve comprising a valve body (10), and the connection structure comprising a slide sleeve (4), an elastic member (5), a locking member (9), a connecting tube (2) adapted to be arranged on the housing (1) and a connecting neck (10a) adapted to be arranged on the valve body (10), the connecting tube (2) being connected to the connecting neck (10a) in a sheathing fashion, wherein the slide sleeve (4) capable of sliding in an axial direction is fitted round the outside of the connecting tube (2), and the elastic member (5) capable of driving the slide sleeve (4) to slide toward the valve body (10) is provided between the slide sleeve (4) and the housing (1); after sliding toward the valve body (10), the slide sleeve (4) can engage the connecting tube (2) on the connecting neck (10a), and an axial gap (6) is formed between the slide sleeve (4) and the housing (1); the locking member (9) capable of sliding in a radial direction of the connecting tube (2) is engageable on the housing (1); and after the locking member (9) has slid toward the connecting tube (2), the locking member (9) is insertable into the axial gap (6) and lockable on the housing (1).

2. The connection structure for an actuator and a valve as claimed in claim 1, characterized in that a protruding engagement block (3) is provided on the housing (1), with an engagement groove (3a) being provided on the engagement block (3), wherein the locking member (9) is insertable into the engagement groove (3a) and is slidable along the engagement groove (3a).

3. The connection structure for an actuator and a valve as claimed in claim 2, characterized in that the engagement block (3) is further provided with a sunken locking indentation (3c), and a protruding locking protrusion (9a3) capable of being inserted into the locking indentation (3c) is provided on the locking member (9); and when the locking protrusion (9a3) is inserted into the locking indentation (3c), the locking member (9) is inserted into the axial gap (6).

4. The connection structure for an actuator and a valve as claimed in claim 3, characterized in that the locking member (9) is provided with a strip-shaped sliding recess (9a1), the engagement block (3) being insertable into the sliding recess (9a1); and two of said engagement grooves (3a) are provided, located on two sides of the engagement block (3) respectively, and two sidewalls of the sliding recess (9a1) are insertable into the corresponding engagement grooves (3a).

5. The connection structure for an actuator and a valve as claimed in claim 4, characterized in that two of said locking indentations (3c) are provided, located on two sides of the engagement block (3) respectively, and two of said locking protrusions (9a3) are provided, arranged in one-to-one correspondence with the locking indentations (3c).

6. The connection structure for an actuator and a valve as claimed in any one of claims 2 - 5, characterized in that the engagement block (3) is provided with a guide groove (3b) in a radial direction ofthe connecting tube (2), and a guide strip (9a2) insertable into the guide groove (3b) is provided on the locking member (9).

7. The connection structure for an actuator and a valve as claimed in any one of claims 3 - 5, characterized in that the engagement block (3) is further provided with a sunken sliding indentation (3d) and a sunken positioning indentation (3e), the locking protrusion (9a3) being insertable into the sliding indentation (3d) and into the positioning indentation (3e); and when the locking protrusion (9a3) is inserted into the positioning indentation (3e), the locking member (9) is disengaged from the axial gap (6); and the sliding indentation (3d) is located between the locking indentation (3c) and the positioning indentation (3e).

8. The connection structure for an actuator and a valve as claimed in any one of claims 2 - 5, characterized in that the locking member (9) is Y-shaped, the locking member (9) comprising a driving handle (9a) in the form of a straight handle and a limiting part (9b) which is arc-shaped or V-shaped; and when the driving handle (9a) is inserted into the engagement groove (3a), the limiting part (9b) is located on an end of the driving handle (9a) which is close to the connecting tube (2), and the limiting part (9b) is insertable into the axial gap (6).

9. The connection structure for an actuator and a valve as claimed in claim 8, characterized in that a protruding force application protrusion (9c) is provided on an end of the driving handle (9a) which is remote from the connecting tube (2).

10. The connection structure for an actuator and a valve as claimed in any one of claims 1 - 5, characterized in that an outside face ofthe connecting neck (10a) is provided with an annular groove (10b), a protruding stop ring (4a) is provided on an inside face ofthe slide sleeve (4), and an outside face of the connecting tube (2) is provided with a shoulder (2b) and a fixing groove (2c), the fixing groove (2c) being close to the valve body (10), and the stop ring (4a) being located between the shoulder (2b) and the fixing groove (2c); a retaining ring (7) is fixed in the fixing groove (2c), and a sidewall ofthe connecting tube (2) is provided with multiple through-holes (2d) in a circumferential direction, the through-holes (2d) being located between the fixing groove (2c) and the shoulder (2b), and a ball (8) being mounted in each through-hole (2d); and wherein the elastic member (5) is a compression spring, and the elastic member (5) is fitted round the outside of the connecting tube (2), with two ends ofthe elastic member (5) being in abutment with the stop ring (4a) and the shoulder (2b) respectively; and under the action of the elastic force of the elastic member (5), the stop ring (4a) abuts the retaining ring (7), and the stop ring (4a) blocks outer end openings of the through-holes (2d) so that inside parts ofthe balls (8) are inserted into the annular groove (10b).