CN214789068U - Retaining negative pressure flow relief valve - Google Patents
Retaining negative pressure flow relief valve Download PDFInfo
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- CN214789068U CN214789068U CN202120375614.3U CN202120375614U CN214789068U CN 214789068 U CN214789068 U CN 214789068U CN 202120375614 U CN202120375614 U CN 202120375614U CN 214789068 U CN214789068 U CN 214789068U
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Abstract
The invention discloses a backstop negative pressure flow relief valve with a limit function. The novel valve seat comprises a valve seat main body with an air suction hole and a pressure relief hole and a valve core capable of being installed in the valve seat main body, wherein the head of the valve core is arranged to be a conical head, the conical head and the air suction hole can be matched and sealed after the valve core is screwed into the valve seat main body, a ring groove which is located on the same axis with the air suction hole is further formed in the valve seat main body, a clamping groove is formed in the valve core, and an opening clamp spring is arranged in the clamping groove. The opening clamp spring can enter from the rear end face of the valve seat main body and is limited in the annular groove, and the valve core is limited to withdraw from the valve seat main body due to the fact that a certain amount of eccentricity is formed between the opening clamp spring and the annular groove. The advantages are that: the structure design is very ingenious, the installation and the operation are both simple and convenient, no additional assembly process is added, the production and the use efficiency are greatly improved, and the use reliability is very good by utilizing the unique characteristic of the clamp spring.
Description
Technical Field
The invention relates to a negative pressure flow relief valve structure, in particular to a backstop negative pressure flow relief valve with a limit function.
Background
On negative pressure medical instrument such as sputum aspirator and aspirator, all can use flow relief valve, its effect is the flow that the reposition of redundant personnel negative pressure pump produced, and the reduced pressure when the relief valve is closed, pressure in the work gas circuit equals the limit negative pressure that the negative pressure pump produced, when the relief valve was opened, according to the size that the relief valve was opened, reached the work negative pressure value that the user needed.
The existing flow relief valve generally comprises a valve seat and a valve core, wherein the head of the valve core is provided with a cone which is connected to the valve seat by threads; the bottom of the valve seat is provided with an air suction hole, the side surface of the middle part of the valve seat is provided with a through pressure relief hole, and when the valve core is rotated rightwards, the conical body of the head of the valve core blocks the air suction hole at the bottom of the valve seat, no flow is discharged; when the left-handed valve core is rotated, a gap is formed between the head cone of the valve core and the air suction hole at the bottom of the valve seat, air flows out of the pressure release hole penetrating through the middle side face of the valve seat, the pressure in the system pipeline is reduced along with the gradual increase of the gap between the head cone of the valve core and the air suction hole at the bottom of the valve seat until the pressure release valve is completely opened, all air is discharged from the pressure release hole, and the negative pressure value in the system pipeline is reset to zero.
The problems with conventional designs of such flow relief valves are: in addition, some stopping structures adopting stopping nuts are adopted in the prior art to avoid the problem of falling, but the stopping structures are complex in structural design, troublesome in operation, low in use efficiency, poor in reliability and high in manufacturing cost.
Disclosure of Invention
The invention aims to solve the technical problem of providing a backstop negative pressure flow relief valve which is ingenious in structural design, simple and convenient to operate and capable of preventing a valve core from being unscrewed and ensuring use reliability.
In order to solve the technical problem, the non-return negative pressure flow relief valve comprises a valve seat main body with an air suction hole and a pressure relief hole and a valve core capable of being installed in the valve seat main body, wherein the head of the valve core is provided with a conical head, the conical head can be matched with the air suction hole after the valve core is installed in the valve seat main body, a ring groove which is located on the same axis with the air suction hole is further formed in the valve seat main body, a clamping groove is formed in the valve core, an opening clamp spring is arranged in the clamping groove, and the opening clamp spring can enter from the rear end face of the valve seat main body and is limited in the ring groove so as to limit the valve core to withdraw from the valve seat main body.
The tail of the valve core is fixedly provided with a knob, and the valve core is sleeved with a damping spring positioned between the knob and the valve seat main body.
The valve seat is characterized in that an external thread section is arranged on the rear side of the conical head, and an internal thread section matched with the external thread section is arranged in the valve seat main body.
The valve core is also provided with a conical surface section positioned at the root part of the external thread section, and the clamping groove is arranged at the root part of the rear side of the conical surface section.
The inner diameter of the opening clamp spring is larger than the outer diameter of the external thread section of the valve core and smaller than the maximum diameter end of the conical surface section of the valve core.
The rear end face of the valve seat main body is provided with a conical opening.
The outer diameter of the clamping groove on the valve core is smaller than the inner diameter of the opening clamping spring.
The opening clamp spring is sleeved in the clamping groove, and an eccentric gap of 0.3-0.5mm is formed between the opening clamp spring and the clamping groove in the radial direction.
The invention has the advantages that:
because the annular groove arranged in the valve seat main body and positioned on the same axis with the air suction hole and the clamping groove provided with the opening clamping spring and arranged on the valve core are skillfully utilized, the eccentric characteristic of the opening clamping spring is matched with the special structure of the opening clamping spring, so that the opening clamping spring is in a state eccentric to the axis of the valve core main body as soon as the opening clamping spring falls into the clamping groove, the valve core is reversely rotated, the opening clamping spring in the eccentric state is in limit fit with the valve seat main body, the valve core is prevented from being carelessly rotated to fall off from the valve seat main body during rotation, the structural design is very ingenious, the installation and the operation are simple and convenient, no additional assembly process is added, the production and the use efficiency are greatly improved, and the use reliability is very good by utilizing the special characteristic of the clamping spring.
Drawings
FIG. 1 is a schematic diagram of a main view structure of a backstop negative pressure flow relief valve of the invention;
fig. 2 is a schematic cross-sectional view of the backstopping negative pressure flow relief valve of the invention.
Fig. 3 is an exploded schematic view of the backstopping negative pressure flow relief valve of the invention.
In the figure, 1-suction hole; 2-pressure relief holes; 3-a valve seat body; 4-a valve core; 5-a conical head; 6-ring groove; 7-a clamping groove; 8-opening clamp spring; 9-a knob; 10-a damping spring; 11-external thread section; 12-internal thread section; 13-a conical surface section; 14-a tapered opening; and 15, opening the hole.
Detailed Description
The non-return negative pressure flow relief valve of the present invention will be described in further detail with reference to the accompanying drawings and the description.
As shown in the figure, the non-return negative pressure flow relief valve of the present invention comprises a valve seat main body 3 having an air suction hole 1 and a pressure relief hole 2, and a valve core 4 capable of being installed in the valve seat main body, as can be seen from the figure, the head of the valve core 4 is set as a conical head 5, the valve core 4 is provided with an external thread section 11 located at the rear side of the conical head, the valve core 4 is further provided with a conical surface section 13 located at the root of the external thread section, the rear end of the conical surface section 13 of the valve core 4 is a rear main body section of the valve core, and the rear root of the conical surface section is provided with a clamping groove 7, that is: the conical surface section and the rear section main part section of the valve core 4 are provided with clamping grooves, opening clamp springs 8 are arranged in the clamping grooves 7, the air suction holes 1 are arranged at the front end of the valve seat main body 3, the valve seat main body 3 is provided with through holes which are through from front to back, the pressure relief holes 2 are arranged on the side wall of the front end of the valve seat main body 3 and are positioned behind the air suction holes 1 and communicated with the through holes in a cross mode, and the air suction holes 1 are coaxially arranged in the through holes. Be provided with in the disk seat main part 3 with 11 complex internal thread sections 12 of case external thread section, of course, the surface of disk seat main part still is provided with the disk seat external screw thread for fixed whole relief valve still is provided with in the disk seat main part 3 and is located internal thread section 12 rear and have and be in annular 6 on the same axis with the suction opening, promptly: the rear end of the valve seat main body is provided with a ring groove which can also be called as a concave cavity, the tail part of the valve core 4 is fixedly provided with a plastic knob 9 used for operating the valve core, the plastic knob 9 is rotated, the valve core 4 is matched with a fine thread internal thread of an internal thread section of the valve seat main body through a fine thread external thread of an external thread section and is screwed into the valve seat main body, finally, a conical head is matched with an air suction hole for sealing, meanwhile, an opening clamp spring 8 enters from the rear end face of the valve seat main body and is limited in the ring groove, an eccentricity of 0.3-0.5mm is formed between the opening clamp spring and the outer diameter of a clamp groove, the opening clamp spring can only enter and cannot exit so as to limit the valve core to exit from the valve seat main body, and in addition, the valve core 4 is sleeved with a damping spring 10 positioned between the knob and the valve seat main body.
Furthermore, the inner diameter of the opening clamp spring 8 is larger than the outer diameter of the external thread section of the valve core and smaller than the maximum diameter end of the conical surface section of the valve core, that is, the inner diameter of the opening clamp spring is slightly larger than the large diameter of the fine thread external thread of the valve core, the opening clamp spring can be directly sleeved outside the fine thread external thread of the valve core until the opening clamp spring touches the conical surface section 13 of the valve core, a conical opening 14 (chamfer) is arranged at the rear end surface of the valve seat main body 1, the outer diameter of the clamping groove on the valve core 4 is smaller than the inner diameter of the opening clamp spring 8, the oblique angle of the conical surface section of the valve core is smaller than the angle of the conical opening 14 of the valve seat main body, an opening 15 positioned at the inner side of the conical opening 14 is also arranged at the rear end surface of the valve seat main body 1, and the diameter of the opening 15 is smaller than the inner diameter of the annular groove 6 of the valve seat main body; the inner diameter of the annular groove 6 is larger than the outer diameter of the opening clamp spring 8, the knob is rotated, the fine thread external thread of the valve core is connected with the fine thread internal thread on the valve seat main body until the opening clamp spring touches the rear end face of the valve seat main body, then a torque force is slightly applied, at the moment, because the oblique angle of the conical surface section of the valve core is far smaller than the angle of the conical opening 14 of the valve seat main body, the opening clamp spring opens outwards and slides into the clamping groove on the valve core, the knob is continuously rotated, the opening clamp spring closes inwards under the extrusion of the conical opening 14 (chamfer angle) of the valve seat main body, the outer diameter of the opening clamp spring becomes small until the size of the inner diameter of the opening 15 on the valve seat main body is just less than or equal to the size of the inner diameter of the opening 15 on the valve seat main body, the opening clamp spring is extruded into the annular groove 6 of the valve seat main body, when slight clicking sound is heard, the opening clamp spring falls into the annular groove on the valve seat main body, the clicking sound is the elastic force recovery of the opening clamp spring, in addition, because the outer diameter of draw-in groove 7 on the case is less than the inner diameter of opening jump ring a little, opening jump ring falls into draw-in groove 7, just is in the state eccentric with the case axis, and the valve core is reversed again this moment, and opening jump ring that is in eccentric state is spacing in the disk seat main part and can't come out, and the case reversal has also not rotated, what need explain in addition is: the outer diameter of the clamping groove (open clamp spring groove) 7 determines the eccentric amount of the open clamp spring; the aperture of the conical opening (opening clamping spring plate flange) 15 determines the difficulty of assembly, and the 2-position size is the key size for realizing feasibility and stopping the valve core
The specific principle is as follows:
(1) the square nut is connected with the external thread of the valve seat main body through the internal thread of the square nut and is mainly used for fixing the whole assembled pressure release valve on an operation panel of a machine;
(2) before the relief valve is assembled, the plastic knob 9 is connected with the valve core 4 through encapsulation and injection molding, the plastic knob is provided with a rotation stopping groove, so that reliable installation can be realized, and the rotation stopping groove of the plastic knob is used for ensuring that the valve core must rotate along with the rotation of the plastic knob;
(3) the opening clamp spring is a standard part, the inner diameter of the opening clamp spring is a natural integer, the opening clamp spring 8 is sleeved from one end, provided with a conical head, of the valve core 4 until the opening clamp spring touches a conical surface section (clamp spring guide conical surface) of the valve core and cannot be pushed any more, and the clamp spring guide conical surface has the function of ensuring that the opening clamp spring is concentric with the valve core all the time in the whole assembly process;
(4) the damping spring is sleeved from a conical head (air sealing conical head end) 5 of the valve core until the damping spring moves to the plastic knob;
(5) extending the head end of the air sealing cone on the valve core 4 into the through hole of the valve seat, wherein the external thread on the valve core 4 is connected with the internal thread of the valve seat main body;
(6) rotate the plastics knob, run into the opening jump ring of disk seat main part and touch the opening card reed flange terminal surface, promptly: the back end face of the valve seat main body is slightly twisted, and at the moment, because the bevel angle of the conical surface section (clamp spring guide conical surface) on the valve core 4 is far smaller than the chamfer angle of the flange end face of the opening clamp spring piece on the valve seat main body, the opening of the opening clamp spring is outwards enlarged and slides into a ring groove (opening clamp spring groove) on the valve core;
(7) continue to rotate the plastics knob, the opening jump ring is under the extrusion of the chamfer of opening card reed flange terminal surface on the disk seat main part, the opening is inside closed, the external diameter of opening jump ring diminishes, until just being equal to or being less than the trompil diameter size of opening card reed flange terminal surface on the disk seat main part, the opening jump ring begins to get into in the disk seat main part, until hearing slight crack sound, the opening jump ring falls into annular (interior opening card reed inner chamber) on the disk seat main part, crack sound is opening card reed resilience, the open sound of opening.
(8) Because the outer diameter of the opening clamp spring groove on the valve core is smaller than the inner diameter of the opening clamp spring, the opening clamp spring is in an eccentric state with the axis of the valve core as soon as the opening clamp spring falls into the clamp groove, the valve core is reversely rotated at the moment, the opening clamp spring in the eccentric state blocks the valve seat main body, and the valve core cannot rotate when the valve core is out.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (8)
1. The utility model provides a stopping negative pressure flow relief valve, includes disk seat main part (3) that have suction opening (1) and pressure release hole (2) and can install case (4) in the disk seat main part, its characterized in that: the head of case (4) sets up to conical head (5), case (4) are installed and are made conical head and suction hole cooperation after in the disk seat main part, still be provided with in disk seat main part (3) and be in annular (6) on the same axis with the suction hole, be provided with draw-in groove (7) on case (4), settle in draw-in groove (7) and have opening jump ring (8), opening jump ring (8) can follow the rear end face department of disk seat main part and get into and spacing in the annular in order to restrict the case and withdraw from in the disk seat main part.
2. The backstopping negative pressure flow relief valve according to claim 1, characterized in that: the tail of the valve core (4) is fixedly provided with a knob (9), and the valve core (4) is sleeved with a damping spring (10) positioned between the knob and the valve seat main body.
3. The backstopping negative pressure flow relief valve according to claim 1 or 2, characterized in that: the valve seat is characterized in that an external thread section (11) located on the rear side of the conical head is arranged on the valve core (4), and an internal thread section (12) matched with the external thread section is arranged in the valve seat main body (3).
4. The backstopping negative pressure flow relief valve according to claim 3, characterized in that: the valve core (4) is also provided with a conical surface section (13) positioned at the root part of the external thread section, and the clamping groove (7) is arranged at the root part of the rear side of the conical surface section.
5. The backstopping negative pressure flow relief valve according to claim 4, characterized in that: the inner diameter of the opening clamp spring (8) is larger than the outer diameter of the external thread section of the valve core and smaller than the maximum diameter end of the conical surface section of the valve core.
6. The backstopping negative pressure flow relief valve according to claim 1, 2, 4 or 5, characterized in that: the rear end face of the valve seat main body (3) is provided with a conical opening (14).
7. The backstopping negative pressure flow relief valve according to claim 6, characterized in that: the outer diameter of the clamping groove in the valve core (4) is smaller than the inner diameter of the opening clamping spring (8).
8. The backstopping negative pressure flow relief valve according to claim 7, characterized in that: the opening clamp spring (8) is sleeved in the clamping groove (7) and has an eccentric gap of 0.3-0.5mm between the radial direction and the clamping groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120375614.3U CN214789068U (en) | 2021-02-18 | 2021-02-18 | Retaining negative pressure flow relief valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120375614.3U CN214789068U (en) | 2021-02-18 | 2021-02-18 | Retaining negative pressure flow relief valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214789068U true CN214789068U (en) | 2021-11-19 |
Family
ID=78753587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120375614.3U Active CN214789068U (en) | 2021-02-18 | 2021-02-18 | Retaining negative pressure flow relief valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214789068U (en) |
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2021
- 2021-02-18 CN CN202120375614.3U patent/CN214789068U/en active Active
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