Negative pressure suction valve and endoscope

Abstract

The utility model provides a negative pressure suction valve and an endoscope, relates to the technical field of endoscopes, and solves the problem that in the prior art, the passing ability of fluid or particulate matter in a suction valve is poor. The endoscope comprises a negative pressure suction valve, wherein the negative pressure suction valve comprises a valve body and a valve core; one end of the valve body in the axial direction is connected with a first pipe connector used for being connected with a suction pipe, and the first pipe connector is arranged at the eccentric position of the valve body. The valve element is coaxially installed on the valve body and can move along the axis of the valve body to open and close the negative pressure suction valve. Under the condition that the first pipe connector arranged at the shaft end of the negative pressure suction valve and the valve element are in an offset relation, the blocking effect of the valve element on fluid or particulate matter sucked by the first pipe connector is smaller, so that the fluid or the particulate matter can bypass one side of the valve element more easily, passing of the particulate matter is particularly facilitated, and the service life of the valve element is prolonged. And therefore, the passing ability of fluid or particulate matters can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of endoscopes, in particular to a negative pressure suction valve and an endoscope. Background Art

[0002] An endoscope is inserted into the human body through a natural or artificially constructed cavity for inspection or treatment. When using an endoscope, it is often necessary to collect fluid or particulate matter in the patient's body by means of negative pressure suction. The timing of collection is controlled by the operator by pressing the valve cap of the suction valve. When pressed, the valve core is separated from the valve body, and the suction valve is turned on. The fluid or particulate matter in the human body enters the instrument tube under the action of negative pressure and then enters the suction valve through the suction tube, and then is discharged to the negative pressure source or sample bottle through the suction connector for collection. After loosening the valve cap, the valve core quickly returns to its position under the action of the reset spring, closing the suction valve.

[0003] The existing suction valve has a strong blocking effect on the fluid or particles entering therein, so that the fluid or particles have poor permeability. Utility Model Content

[0004] The utility model aims to design a negative pressure suction valve and an endoscope, so as to solve the problem that the fluid or particles have poor permeability in the suction valve.

[0005] The utility model is realized by the following technical solutions:

[0006] The utility model provides a negative pressure suction valve, comprising a valve body and a valve core; one axial end of the valve body is connected to a first pipe joint for connecting a suction pipe, and the first pipe joint is arranged at an eccentric position of the valve body; the valve core is coaxially installed on the valve body, and can move along the axis of the valve body to open and close the negative pressure suction valve.

[0007] When the above-mentioned setting structure is adopted, since the fluid or particulate matter sucked in through the first pipe joint will be discharged outward through the annular space between the opened valve core and the valve body, when there is an offset relationship between the first pipe joint and the valve core set at the axial end of the negative pressure suction valve, during the process of the valve core moving to open the negative pressure suction valve, the valve core will have a smaller blocking effect on the fluid or particulate matter sucked in by the first pipe joint, making it easier for the fluid or particulate matter to bypass one side of the valve core, which is particularly beneficial to the passage of particulate matter, thereby improving the permeability of the fluid or particulate matter.

[0008] In addition, since the first pipe joint is arranged at the eccentric position of the valve body, after the negative pressure suction valve is installed in the handle shell of the endoscope, the first pipe joint can be arranged toward one side of the shell wall, so as to free up more practically available installation space in the handle shell, which is beneficial to improving the utilization rate of the internal space of the handle shell. For example, it can be used to set the traction wheel assembly, so that the traction wheel assembly and the negative pressure suction valve can be arranged more compactly, which in turn promotes the reduction of the thickness of the handle shell.

[0009] In order to better realize the present utility model, the following setting structure is particularly adopted: the peripheral wall of the valve body is connected to a second pipe joint for connecting the negative pressure nozzle, and the second pipe joint extends toward the setting position of the first pipe joint relative to the axis of the valve body, and / or the second pipe joint extends toward the first pipe joint in the axial direction of the valve body.

[0010] When the above-mentioned setting structure is adopted, the second pipe joint is extended from the valve body toward the position of the first pipe joint, so that the port of the second pipe joint is closer to the port of the first pipe joint and both are biased towards the same side of the valve body. This will enable the negative pressure suction valve to further improve the space utilization inside the handle shell.

[0011] To further better realize the utility model, the following structure is particularly adopted: the outer peripheral surface of the valve body is provided with an axially extending ear plate, the second pipe joint obliquely passes through the ear plate and is fixed thereto, and / or the ear plate is provided with a screw hole.

[0012] When the above-mentioned structure is adopted, the ear plate extending along the axial direction of the valve body can improve the structural strength of the valve body. The second pipe joint obliquely passing through and fixing the ear plate can support the ear plate to improve the structural strength of each other.

[0013] In order to further better realize the present utility model, the following setting structure is particularly adopted: one end of the first pipe joint is provided with an end cover eccentrically arranged therewith, the end cover is coaxially covered at one end of the valve body in the axial direction, one side of the end cover is provided with an axial protrusion, and one end of the valve body in the axial direction is provided with an embedding groove, and the axial protrusion is embedded in the embedding groove to stop circumferential rotation.

[0014] When the above-mentioned setting structure is adopted, the end cover realizes circumferential rotation prevention through the engagement of the protrusion with the groove of the valve body, which will facilitate the assembly of the first pipe joint and the valve body, reduce the assembly difficulty, and improve the assembly progress of the first pipe joint and the valve body.

[0015] In order to further better realize the present utility model, the following setting structure is particularly adopted: the negative pressure suction valve also includes a valve stem and a valve bonnet coaxially installed on the valve body, the two ends of the valve stem are respectively fixedly connected to the valve core and the valve bonnet, and the peripheral wall of the valve bonnet is provided with an air vent that passes through the inside and outside. When the negative pressure suction valve is closed, the air vent can be connected to the inlet of the second pipe joint.

[0016] In order to further better realize the present utility model, the following setting structure is particularly adopted: the valve cap and the valve body are axially guided and circumferentially stopped by an axial slide groove and slider structure.

[0017] When the above-mentioned arrangement structure is adopted, the axial rotation stop between the valve cap and the valve body can prevent the valve stem and the valve core from rotating.

[0018] In order to further better realize the present utility model, the following setting structure is particularly adopted: the top end of the valve stem axially abuts against the valve cap, and a ventilation groove is provided at the top end of the valve stem. When the negative pressure suction valve is closed, the ventilation hole can be connected to the inlet of the second pipe joint through the ventilation groove.

[0019] In order to better realize the utility model, the following setting structure is particularly adopted: an axial barb is provided at the top end of the valve stem, and the hook-shaped portion of the barb is inserted into the vent hole to snap into place to fix the valve stem and the valve cap, and a gap for ventilation is formed between the hook-shaped portion and the vent hole.

[0020] When the above-mentioned structure is adopted, the valve stem can be axially buckled and fixed with the valve cap through the axial barb at the top, which can facilitate the assembly of the valve stem and the valve cap. The valve cap uses the vent hole for ventilation to buckle with the barb, which kills two birds with one stone and simplifies the structure of the valve cap.

[0021] In order to better realize the utility model, the following setting structure is particularly adopted: a flange disk is arranged at the bottom of the valve core, one side of the flange disk is arranged as a missing corner, and the missing corner is axially aligned with the first pipe joint.

[0022] When the above-mentioned structure is adopted, the missing corner on the flange disk can increase the clearance between the valve core and the valve body, so that the fluid or particles can bypass the valve core more smoothly, which can improve the fluid or particles passing through the valve core. At the same time, the missing corner is axially aligned with the first pipe joint, which can be more conducive to the fluid or particles bypassing the valve core, which can further improve the fluid or particles passing through the valve core.

[0023] In order to better realize the utility model, the following setting structure is particularly adopted: a section where the valve stem is connected to the valve core is set as a cross axis, and an annulus is formed between the outer peripheral surface of the cross axis and the peripheral surface of the valve body.

[0024] When the above-mentioned structure is adopted, after the valve stem and the valve core are connected to a section configured as a cross axis, the gap between the section and the valve body can be increased, thereby improving the permeability of fluid or particles bypassing the valve core.

[0025] In order to better realize the present utility model, the following setting structure is particularly adopted: the cross axis includes a vertical first transverse rib and a second transverse rib, the first transverse rib passes through the axis of the valve stem, and the second transverse rib is eccentrically arranged to separate a larger first pore extending axially and a smaller second pore extending axially on both sides of the first transverse rib.

[0026] When the above-mentioned configuration is adopted, the offset cross axis increases the size of the pores on one side by reducing the size of the pores on the other side, which will facilitate the passage of larger particles through the larger first pores, thereby improving the passability of the particles.

[0027] To further better realize the present invention, the following setting structure is particularly adopted: compared with the first hole and the second hole located on the same side of the first transverse rib, the first hole is arranged closer to the inlet of the second pipe joint.

[0028] When the above-mentioned setting structure is adopted, the larger first pore is arranged closer to the inlet of the second pipe joint, which is conducive to larger particles entering the second pipe joint through the shortest path with the least hindrance, and is conducive to improving the permeability of fluids or particles.

[0029] The utility model also provides an endoscope, which includes a handle shell and a suction tube, a traction wheel assembly and the above-mentioned negative pressure suction valve installed on the handle shell; the negative pressure suction valve and the traction wheel assembly are arranged in sequence in the thickness direction of the handle shell, and the first pipe joint of the negative pressure suction valve is arranged farther away from the traction wheel assembly relative to the axis of the valve body of the negative pressure suction valve; the suction tube is plugged into the first pipe joint of the negative pressure suction valve.

[0030] When the above-mentioned setting structure is adopted, the first pipe joint is arranged at the eccentric position of the valve body, and after the negative pressure suction valve is installed to the handle shell of the endoscope, the first pipe joint is arranged farther away from the traction wheel assembly relative to the axis of the valve body of the negative pressure suction valve, thereby freeing up more practically available setting space for the traction wheel assembly in the handle shell, improving the utilization rate of the internal space of the handle shell, allowing the traction wheel assembly and the negative pressure suction valve to be arranged more compactly, which in turn promotes a reduction in the thickness of the handle shell.

[0031] The utility model has the following advantages and beneficial effects:

[0032] In the utility model, since the fluid or particles sucked through the first pipe joint will be discharged outward through the annulus between the opened valve core and the valve body, when there is an offset relationship between the first pipe joint and the valve core set at the axial end of the negative pressure suction valve, the valve core will have a smaller blocking effect on the fluid or particles sucked by the first pipe joint during the movement of the valve core to open the negative pressure suction valve, making it easier for the fluid or particles to bypass from one side of the valve core, which is particularly beneficial to the passage of particles, thereby improving the permeability of the fluid or particles. Since the first pipe joint is set at the eccentric position of the valve body, after the negative pressure suction valve is installed on the handle housing of the endoscope, the first pipe joint can be set toward one side of the shell wall to free up more practically available setting space in the handle housing, which is beneficial to improving the utilization rate of the internal space of the handle housing, such as being used to set a traction wheel assembly, so that the traction wheel assembly and the negative pressure suction valve are set more compactly, which in turn promotes a reduction in the thickness of the handle housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of the appearance structure of the endoscope;

[0035] Figure 2 The structure inside the handle housing is shown;

[0036] Figure 3 The partial layout structure of the negative pressure suction valve and the traction wheel assembly relative to the lower shell portion is shown;

[0037] Figure 4 The partial installation structure of the negative pressure suction valve relative to the upper shell is shown;

[0038] Figure 5 The layout structure between the negative pressure suction valve and the traction wheel assembly is shown;

[0039] Figure 6 This is a schematic diagram of the appearance structure of the negative pressure suction valve;

[0040] Figure 7 The internal structure of the negative pressure suction valve is shown;

[0041] Figure 8 The exploded structure of the negative pressure suction valve is shown;

[0042] Fig. 9is a side view schematic diagram of a negative pressure suction valve;

[0043] Fig.10 1 is a bottom view schematic diagram of a negative pressure suction valve;

[0044] Fig.11 The structure of the offset cross axis is shown.

[0045] The markings in the figure are:

[0046] 10. Negative pressure suction valve;

[0047] 11. valve body; 111. embedded groove;

[0048] 12. First pipe joint;

[0049] 13. Second pipe joint;

[0050] 14. Ear plate; 141. Screw hole;

[0051] 15, valve core; 151, flange plate; 1511, missing corner;

[0052] 16, valve stem; 161, vent groove; 162, barb; 16a, cross shaft; 163, first pore; 164, second pore; 16b, plunger; 165, sealing ring;

[0053] 17, valve cap; 171, vent hole; 171a, gap; 172, slider;

[0054] 18. Spring;

[0055] 19. end cover; 191. bump;

[0056] 20. Suction tube;

[0057] 30. handle housing; 31. upper housing; 32. lower housing;

[0058] 40. Traction wheel assembly;

[0059] 50. Connect the short pipe;

[0060] 60. Negative pressure nozzle. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0062] In the description of the present utility model, it should be noted that, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0063] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0064] Embodiment 1:

[0065] A negative pressure suction valve 10 can improve the permeability of fluid or particles sucked therein, such as Figure 1-Figure 11 As shown, it is particularly configured as follows:

[0066] In this embodiment, Figure 6-Figure 10 As shown, the negative pressure suction valve 10 includes a valve body 11 and a valve core 15 , a valve stem 16 , a valve cap 17 and a spring 18 coaxially mounted on the valve body 11 .

[0067] The top and bottom ends of the valve stem 16 are respectively fixedly connected to the valve cap 17 and the valve core 15, and the valve core 15 can be opened and closed on the valve seat provided in the valve body 11. The top end of the valve cap 17 is located outside the valve body 11 and can be pressed to drive the valve stem 16 and the valve core 15 to move along the axis of the valve body 11 to open the negative pressure suction valve 10. The spring 18 is sleeved on the valve stem 16, with the top end abutting on the valve cap 17 and the bottom end abutting on the valve body 11, so as to drive the valve core 15 to reset to close the negative pressure suction valve 10.

[0068] like Figure 7 , Fig. 9 and Fig.10 As shown, the bottom end of the valve body 11 in the axial direction is connected with a first pipe joint 12, which is arranged at an eccentric position of the valve body 11 so that the valve core 15 is not directly opposite to the outlet of the first pipe joint 12. The first pipe joint 12 is used to connect the suction pipe 20.

[0069] The axis of the first pipe joint 12 can be Fig. 9 and Fig.10 As shown, it may be parallel to the axis of the valve body 11, or it may not be parallel.

[0070] like Figure 6-Figure 10 As shown, a second pipe joint 13 is connected to the peripheral wall of the valve body 11 , and an inlet of the second pipe joint 13 is located between the valve core 15 and the valve cap 17 , and is used to connect to a negative pressure nozzle 60 to discharge the fluid or particles sucked into the valve body 11 outwardly.

[0071] When the negative pressure suction valve 10 is connected to the negative pressure source through the second pipe joint 13, when the valve core 15 is opened, the fluid or particles will be sucked into the valve body 11 through the first pipe joint 12, and then flow to the inlet of the second pipe joint 13 through the annulus temporarily formed between the opened valve core 15 and the valve body 11, and then discharged to the outside. When the valve core 15 is closed, the first pipe joint 12 and the second pipe joint 13 are cut off, and the negative pressure source is connected to the outside through the ventilation air path opened on the valve body 11 or the valve cap 17.

[0072] In this embodiment, when there is an offset relationship between the first pipe joint 12 and the valve core 15 provided at the axial end of the negative pressure suction valve 10, when the valve core 15 moves to open the negative pressure suction valve 10, the valve core 15 will have a smaller blocking effect on the fluid or particles sucked by the first pipe joint 12, so that the fluid or particles are more likely to bypass from one side of the valve core 15, which is particularly beneficial to the passage of particles, thereby improving the permeability of the fluid or particles. In addition, since the first pipe joint 12 is provided at the eccentric position of the valve body 11, after the negative pressure suction valve 10 is installed on the handle housing 30 of the endoscope, the first pipe joint 12 can be provided to deviate to one side of the shell wall, so as to free up more practically available installation space in the handle housing 30, which is beneficial to improving the utilization rate of the internal space of the handle housing 30, for example, it can be used to provide the traction wheel assembly 40, so that the traction wheel assembly 40 and the negative pressure suction valve 10 are provided more compactly, which in turn promotes the reduction of the thickness of the handle housing 30.

[0073] According to some optional embodiments, Fig. 9 and Fig.10 As shown, the second pipe joint 13 extends toward the location of the first pipe joint 12 relative to the axis of the valve body 11. This arrangement allows the second pipe joint 13 to extend from the valve body 11 toward the location of the first pipe joint 12, and the port of the second pipe joint 13 and the port of the first pipe joint 12 are both biased toward the same side of the valve body 11, so that the negative pressure suction valve 10 can further improve the space utilization rate in the handle housing 30.

[0074] According to some optional embodiments, Fig. 9 and Fig.10As shown, the second pipe joint 13 extends in the axial direction of the valve body 11 toward the first pipe joint 12. This arrangement allows the second pipe joint 13 to extend from the valve body 11 toward the position where the first pipe joint 12 is located, so that the port of the second pipe joint 13 is closer to the port of the first pipe joint 12, which will enable the negative pressure suction valve 10 to further improve the space utilization rate in the handle housing 30.

[0075] According to some optional embodiments, Fig. 9 and Fig.10 As shown, the outer circumferential surface of the valve body 11 is provided with a lug plate 14 , the lug plate 14 extends along the axial direction of the valve body 11 , and the second pipe joint 13 obliquely passes through the lug plate 14 and is fixed to the lug plate 14 .

[0076] In this embodiment, the ear plate 14 extending axially along the valve body 11 can improve the structural strength of the valve body 11. The second pipe joint 13 obliquely passing through and fixing the ear plate 14 can support the ear plate 14 to improve the structural strength of each other.

[0077] Exemplarily, the second pipe joint 13, the ear plate 14 and the valve body 11 are integral structural components manufactured by integral molding.

[0078] Preferably, a screw hole 141 is provided on each side of the ear plate 14 on the second pipe joint 13, so that the ear plate 14 can be used as a connecting piece and connected to the handle housing 30 of the endoscope by screws, so that the valve body 11 can be fixed on the handle housing 30.

[0079] According to some optional embodiments, Figure 6-Figure 8 As shown, the first pipe joint 12 is detachably connected to the valve body 11. Specifically, the outlet end of the first pipe joint 12 is fixedly connected with a larger end cover 19. The first pipe joint 12 is arranged at an eccentric position of the end cover 19, and the end cover 19 is coaxially covered at the bottom end of the valve body 11 in the axial direction.

[0080] Exemplarily, the first pipe joint 12 and the end cover 19 are integral structural parts manufactured by integral molding.

[0081] Preferably, Figure 8 As shown, a protrusion 191 extending axially is provided on one side of the top surface of the end cover 19, and a groove 111 is provided on the bottom end of the valve body 11 in the axial direction. Figure 6 and Figure 7 As shown in the figure, the first pipe joint 12 and the end cover 19 are inserted into the embedding groove 111 to prevent rotation in the circumferential direction, so that the first pipe joint 12 and the end cover 19 are fixed to the bottom end of the valve body 11. The end cover 19 is inserted into the embedding groove 111 of the valve body 11 through the protrusion 191 to prevent rotation in the circumferential direction, which will facilitate the assembly of the first pipe joint 12 and the valve body 11, reduce the assembly difficulty, and improve the assembly progress of the first pipe joint 12 and the valve body 11.

[0082] According to some optional embodiments, the valve cap 17 and the valve body 11 are axially slidably matched with each other to prevent circumferential rotation. Specifically, the valve cap 17 and the valve body 11 are axially guided and matched with an axial slide block structure to prevent circumferential rotation. Figure 6 and Figure 7 As shown, the outer peripheral surface of the valve cap 17 is provided with a circumferentially extending slider 172, and the inner peripheral wall of the valve body 11 is provided with a circumferentially extending slide groove for accommodating the slider 172, so that the valve cap 17 can move along the axis of the valve body 11 under the guidance of the slide groove and stop rotating relative to the valve body 11 to avoid the valve stem 16 and the valve core 15 from rotating when the valve cap 17 is pressed.

[0083] According to some optional embodiments, Figure 6-Figure 9 As shown, a vent hole 171 that penetrates inside and outside is provided on the peripheral wall of the valve cap 17. When the negative pressure suction valve 10 is closed, the vent hole 171 is connected to the inlet of the second pipe joint 13, so that the negative pressure source is connected to the outside through the valve cap 17.

[0084] According to some optional embodiments, the valve stem 16 and the valve cap 17 are connected as a whole by assembly, such as Figure 7 As shown, the top end of the valve stem 16 axially abuts against the valve cap 17, so that the contact surface between the top end of the valve stem 16 and the valve cap 17 forms a seal, and the top end of the valve stem 16 is provided with a vent groove 161, which connects the vent hole 171 provided on the valve cap 17 with the outside of the valve stem 16. When the negative pressure suction valve 10 is closed, the vent hole 171 can be connected with the inlet of the second pipe joint 13 through the vent groove 161.

[0085] The vent groove 161 may be Figure 7 and Figure 8 The radially extending through groove shown may also be a spiral groove extending spirally around the axis of the valve stem 16 .

[0086] According to some optional embodiments, Figure 7 and Figure 8 As shown, the top of the valve stem 16 is provided with an axially extending barb 162, which has a certain elasticity and is used to hook an object. The hook-shaped portion provided on the top of the barb 162 is inserted into the vent hole 171 and is buckled with the vent hole 171, so that the valve stem 16 is buckled and fixed with the valve cap 17. Figure 6 and Figure 7 As shown, the hook-shaped portion at the top of the barb 162 is buckled with the vent hole 171 , but does not completely block the vent hole 171 , but forms a gap 171 a for ventilation between the barb 162 and the vent hole 171 .

[0087] In this embodiment, the valve stem 16 can be axially buckled and fixed with the valve cap 17 through the axial barb 162 at the top, which can facilitate the assembly of the valve stem 16 and the valve cap 17. The valve cap 17 uses the vent hole 171 for ventilation to buckle with the barb 162, which kills two birds with one stone and simplifies the structure of the valve cap 17.

[0088] According to some optional embodiments, Figure 7 and Figure 8 As shown, a flange 151 is provided at the bottom of the valve core 15, and the bottom end surface of the flange 151 is opposite to the outlet of the first pipe joint 12. One side of the outer peripheral surface of the flange 151 is provided with a notch 1511, and the notch 1511 is axially aligned with the first pipe joint 12.

[0089] In this embodiment, the missing corner 1511 on the flange 151 can increase the clearance between the valve core 15 and the valve body 11, so that the fluid or particles can bypass the valve core 15 more smoothly, and the passing property of the fluid or particles at the valve core 15 can be improved. At the same time, the missing corner 1511 is axially aligned with the first pipe joint 12, which can be more conducive to the fluid or particles bypassing the valve core 15, and the passing property of the fluid or particles at the valve core 15 can be further improved.

[0090] According to some optional embodiments, Figure 7 and Figure 8 As shown, a section where the valve stem 16 is connected to the valve core 15 is configured as a cross shaft 16a, and the cross shaft 16a includes vertical first and second transverse ribs. An annulus is formed between the outer circumference of the cross shaft 16a and the inner circumference of the valve body 11, so that the fluid or particulate matter bypassing the valve core 15 can enter the second pipe joint 13 through the annulus.

[0091] In this embodiment, a section connecting the valve stem 16 and the valve core 15 is configured as a cross axis 16a structure, which will allow a larger space for fluid or particles to pass through between the valve stem 16 and the valve body 11, thereby increasing the gap between the valve stem 16 and the valve body 11, and further increasing the permeability of fluid or particles bypassing the valve core 15.

[0092] In this embodiment, the first transverse rib and the second transverse rib constituting the cross shaft 16a can pass through the axis of the valve stem 16 along the radial direction of the valve stem 16 so that the cross shaft 16a is located in the middle of the valve stem 16. Fig.11 In this way, the first transverse rib passes through the axis of the valve stem 16, and the second transverse rib is eccentrically arranged, so that the cross shaft 16a is located at an eccentric position of the valve stem 16, so that the second transverse rib separates a first pore 163 extending axially and a second pore 164 extending axially and a smaller one on both sides of the first transverse rib. The offset cross shaft 16a increases the size of the pore on the other side by reducing the size of the pore on one side, which will facilitate the passage of larger particles from the larger first pore 163, thereby improving the passability of particles.

[0093] Preferably, compared with the first pore 163 and the second pore 164 located on the same side of the first transverse rib, the first pore 163 is arranged closer to the entrance of the second pipe joint 13. The larger first pore 163 is arranged closer to the entrance of the second pipe joint 13, which is conducive to larger particles entering the second pipe joint 13 through the shortest path with the least obstruction, and is conducive to improving the permeability of fluids or particles.

[0094] Exemplarily, one of the first apertures 163 is radially aligned with the inlet of the second pipe joint 13 .

[0095] Exemplarily, the inlet of the second pipe joint 13 is radially aligned with an end of the second transverse rib that is biased toward the first pore 163 .

[0096] According to some optional embodiments, Figure 7 and Figure 8 As shown, the top of the valve stem 16 is provided with a plunger 16b, and a sealing ring 165 is sleeved on the plunger 16b. When the valve core 15 is in the fully open position, the sealing ring 165 on the plunger 16b contacts the inner wall of the stem cavity of the valve body 11 to form a radial seal, preventing the fluid or particles bypassing the valve core 15 from continuing to move upward, so as to better guide the fluid or particles into the second pipe joint 13. Figure 7 In the closed position shown, the plunger 16 b is separated from the inner wall of the stem cavity of the valve body 11 , so that the vent groove 161 at the top of the valve stem 16 and the inlet of the second pipe joint 13 are unobstructed.

[0097] On the other hand, the present application provides an endoscope, particularly adopting the following configuration:

[0098] In this embodiment, Figure 1-Figure 5 As shown, the endoscope includes a suction tube 20, a handle housing 30, a traction wheel assembly 40, a connecting short tube 50, a negative pressure nozzle 60 and a negative pressure suction valve 10 in any of the above embodiments. The handle housing 30 serves as a shell, and the suction tube 20, the traction wheel assembly 40, the connecting short tube 50, the negative pressure nozzle 60 and the negative pressure suction valve 10 are installed on the handle housing 30.

[0099] The top of the valve cap 17 of the negative pressure suction valve 10 is located outside the handle housing 30. The suction tube 20 is plugged with the first pipe joint 12 of the negative pressure suction valve 10. The two ends of the connecting short tube 50 are plugged with the second pipe joint 13 and the negative pressure nozzle 60 respectively.

[0100] The handle housing 30 is composed of an upper housing 31 and a lower housing 32, and the negative pressure suction valve 10 and the negative pressure nozzle 60 are roughly located between the upper housing 31 and the lower housing 32. Generally, in order to facilitate the installation of various components, the traction wheel assembly 40 is fixed to one part of the handle housing 30, such as Figure 3On the lower shell 32 in.

[0101] like Figure 2 , Figure 3 and Figure 5 As shown, the negative pressure suction valve 10 and the traction wheel assembly 40 are arranged in sequence in the thickness direction of the handle housing 30, that is, in the matching direction of the upper shell 31 and the lower shell 32.

[0102] The first pipe joint 12 of the negative pressure suction valve 10 is arranged closer to the upper shell 31 relative to the axis of the valve body 11 of the negative pressure suction valve 10 , that is, farther away from the traction wheel assembly 40 .

[0103] In this embodiment, since the first pipe joint 12 is arranged at the eccentric position of the valve body 11, and the first pipe joint 12 of the negative pressure suction valve 10 installed in the handle housing 30 is arranged closer to the upper shell 31 relative to the axis of the valve body 11 of the negative pressure suction valve 10, more practical and available installation space is freed up in the handle housing 30 for the traction wheel assembly 40. The utilization rate of the internal space of the handle housing 30 is improved, and the traction wheel assembly 40 and the negative pressure suction valve 10 can be arranged more compactly.

[0104] from Figure 2-Figure 5 It can be seen that part of the structure of the traction wheel assembly 40 intrudes into the axial bottom end of the valve body 11 toward the upper shell 31 and is arranged adjacent to the first pipe joint 12, so that the traction wheel assembly 40 and the negative pressure suction valve 10 are very close to each other, so that the traction wheel assembly 40 will not interfere with the first pipe joint 12 due to being too close to the upper shell 31, which in turn can reduce the thickness of the handle shell 30.

[0105] In some optional embodiments, the second pipe joint 13 extends toward the first pipe joint 12 in the axial direction of the valve body 11, so that a portion of the connecting short pipe 50 can be Figure 4 and Figure 5 As shown, it is bent toward one side of the upper shell 31 to be disposed closer to the upper shell 31 , so that the port of the second pipe joint 13 is also disposed closer to the upper shell 31 , and more installation space is reserved in the handle housing 30 .

[0106] In some optional embodiments, such as Figure 4 As shown, the negative pressure suction valve 10 is fixed to the upper shell 31 through the ear plate 14 on the valve body 11 by screws.

[0107] The above are only specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention.

Claims

1. A negative pressure suction valve, characterized in that: include: A valve body (11), one axial end of which is connected to a first pipe joint (12) for connecting a suction pipe (20), wherein the first pipe joint (12) is arranged at an eccentric position of the valve body (11); The valve core (15) is coaxially mounted on the valve body (11) and can move along the axis of the valve body (11) to open and close the negative pressure suction valve (10).

2. A negative pressure suction valve according to claim 1, characterized in that: The peripheral wall of the valve body (11) is connected to a second pipe joint (13) for connecting a negative pressure nozzle (60), and the second pipe joint (13) extends toward the setting position of the first pipe joint (12) relative to the axis of the valve body (11), and / or the second pipe joint (13) extends toward the first pipe joint (12) in the axial direction of the valve body (11).

3. A negative pressure suction valve according to claim 2, characterized in that: The outer peripheral surface of the valve body (11) is provided with an axially extending ear plate (14), the second pipe joint (13) obliquely passes through the ear plate (14) and is fixed thereto, and / or the ear plate (14) is provided with a screw hole (141).

4. A negative pressure suction valve according to claim 1, characterized in that: An end cover (19) eccentrically arranged therewith is disposed at one end of the first pipe joint (12); the end cover (19) is coaxially arranged at one end of the valve body (11) in the axial direction; an axial protrusion (191) is disposed on one side of the end cover (19); an embedding groove (111) is disposed at one end of the valve body (11) in the axial direction; the axial protrusion (191) is embedded in the embedding groove (111) to prevent circumferential rotation.

5. A negative pressure suction valve according to claim 2, characterized in that: It also includes a valve stem (16) and a valve bonnet (17) coaxially mounted on the valve body (11), the two ends of the valve stem (16) being fixedly connected to the valve core (15) and the valve bonnet (17) respectively, and the peripheral wall of the valve bonnet (17) is provided with an air vent (171) which passes through inside and outside, and when the negative pressure suction valve (10) is closed, the air vent (171) can be connected to the inlet of the second pipe joint (13).

6. A negative pressure suction valve according to claim 5, characterized in that: The valve cap (17) and the valve body (11) are axially guided and matched with each other through an axial slide groove and slider structure and are circumferentially prevented from rotating; and / or, The top end of the valve stem (16) axially abuts against the valve cap (17), and a ventilation groove (161) is provided at the top end of the valve stem (16). When the negative pressure suction valve (10) is closed, the ventilation hole (171) can be connected to the inlet of the second pipe joint (13) through the ventilation groove (161); And / or, the top end of the valve stem (16) is provided with an axial barb (162), the hook-shaped portion of the barb (162) is snapped into the vent hole (171) to achieve the fixation of the valve stem (16) and the valve cap (17), and a gap (171a) for ventilation is formed between the hook-shaped portion and the vent hole (171); And / or, a flange disk (151) is provided at the bottom of the valve core (15), one side of the flange disk (151) is provided with a missing corner (1511), and the missing corner (1511) is axially aligned with the first pipe joint (12).

7. A negative pressure suction valve according to claim 5 or 6, characterized in that: A section where the valve stem (16) is connected to the valve core (15) is arranged as a cross shaft (16a), and an annulus is formed between the outer circumference of the cross shaft (16a) and the inner circumference of the valve body (11).

8. A negative pressure suction valve according to claim 7, characterized in that: The cross shaft (16a) comprises a first vertical transverse rib and a second vertical transverse rib, wherein the first horizontal rib passes through the axis of the valve stem (16), and the second horizontal rib is eccentrically arranged to separate a first axially extending larger pore (163) and an axially extending smaller second pore (164) on both sides of the first horizontal rib.

9. A negative pressure suction valve according to claim 8, characterized in that: Compared with the first pore (163) and the second pore (164) located on the same side of the first transverse rib, the first pore (163) is arranged closer to the entrance of the second pipe joint (13).

10. An endoscope, characterized in that: The invention comprises a handle housing (30), a suction tube (20) mounted on the handle housing (30), a traction wheel assembly (40), and a negative pressure suction valve (10) according to any one of claims 1 to 9; the negative pressure suction valve (10) and the traction wheel assembly (40) are arranged in sequence in the thickness direction of the handle housing (30), and the first pipe joint (12) of the negative pressure suction valve (10) is arranged farther away from the traction wheel assembly (40) relative to the axis of the valve body (11) of the negative pressure suction valve (10); the suction tube (20) is plugged into the first pipe joint (12) of the negative pressure suction valve (10).

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