Sampling valve

Abstract

The utility model relates to the technical field of medical apparatus and instruments, in particular to a sampling valve which comprises a valve seat, a valve core, a valve rod and a valve rod. The valve body is arranged on the valve seat, and a sampling opening is formed in the valve body; the valve element is movably arranged in the inner cavity of the valve seat in the direction close to and away from the sampling opening; the elastic piece is arranged at the second end of the valve element in a sleeving mode, arranged between the valve element and the inner bottom wall of the valve seat and used for preventing the valve element from being away from the sampling opening; and the first guide part is used for keeping the valve core to move along the directions close to and far away from the sampling port, and is arranged on the periphery of the valve core. A guide structure at the top end of an existing valve element is replaced by the first guide part, the situation that the valve element cannot be reset due to crystallization generated between the outer wall of the top end of the valve element and the sampling opening is avoided, liquid leakage of the sampling valve is avoided, and the service life of the sampling valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a sampling valve. Background Art

[0002] During clinical treatment, the hemodialysis equipment needs to regularly extract dialysate online in real time for biochemical testing while the equipment is running. When sampling, the hemodialysis line can only be disconnected for sampling, but this is not only cumbersome to operate, but the dialysate is easily contaminated, making the sampling operation very inconvenient. Therefore, it is necessary to use a hemodialysis equipment sampling valve connected to the hemodialysis line to perform sampling. At present, the sampling valves of hemodialysis equipment are mainly divided into two categories: needle-free non-puncture sampling and needle-puncture sampling. The top of the valve core of the needle-free non-puncture sampling valve reciprocates in the through-hole of the sampling valve body to play a guiding role. After a long period of use, crystals are easily formed between the valve core and the through-hole of the sampling valve body, causing the valve core to get stuck, which makes the valve core unable to reset and leaks. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a sampling valve for solving the problem in the prior art that crystallization is easy to occur between the top of the valve core and the through hole of the sampling valve body, causing the valve core to get stuck, so that the valve core cannot be reset and liquid leakage occurs.

[0004] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a sampling valve, comprising:

[0005] A valve seat, wherein the valve seat is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are respectively connected to the inner cavity of the valve seat;

[0006] A valve body is arranged on the valve seat, and a sampling port is arranged on the valve body, and the sampling port is communicated with the inner cavity of the valve seat;

[0007] A valve core is movably disposed in the inner cavity of the valve seat in a direction close to and away from the sampling port, and a first end of the valve core can enter and exit the sampling port, a gap is provided between the first end of the valve core and the inner wall of the sampling port, and the valve core and the inner end of the sampling port are detachably sealed and matched to correspondingly close and open the sampling port;

[0008] An elastic member, which is sleeved on the second end of the valve core and is disposed between the valve core and the inner bottom wall of the valve seat, and is used to prevent the valve core from moving away from the sampling port;

[0009] The first guide portion is used to keep the valve core moving in a direction close to and away from the sampling port, and is arranged on the outer periphery of the valve core and matched with the inner side wall of the valve seat.

[0010] Optionally, the first guide portion includes a first protrusion arranged around the outer circumference of the valve core, and a gap is provided between the first protrusion and the inner side wall of the valve seat.

[0011] Optionally, a plurality of recessed portions for allowing dialysate to pass therethrough are circumferentially spaced apart on the outer periphery of the first protrusion.

[0012] Optionally, the sampling valve further includes a second guide portion disposed between an outer periphery of a second end of the valve core and an inner bottom wall of the valve seat.

[0013] Optionally, the second guide portion includes a convex column arranged on the inner bottom wall of the valve seat, the second end of the valve core is movably arranged in the inner cavity of the convex column, and the second end of the elastic member is sleeved on the convex column.

[0014] Optionally, the second guide portion includes a guide rib arranged on the inner bottom wall of the valve seat, the second end of the valve core is movably arranged in the guide rib, and the second end of the elastic member is sleeved on the guide rib.

[0015] Optionally, a sealing member is provided between the outer periphery of the first end of the valve core and the material taking port.

[0016] Optionally, a limiting structure for limiting the axial movement of the sealing member along the valve core is provided on the valve core, and the limiting structure includes a stopper portion and a pressing portion provided at both ends of the sealing member.

[0017] Optionally, the stop portion includes a step arranged on the outer periphery of the valve core, and the first end of the sealing member abuts against the step.

[0018] Optionally, the pressing portion includes a second protrusion arranged around the outer circumference of the valve core, and the second protrusion abuts against the second end of the sealing member to press the sealing member onto the step.

[0019] As described above, the sampling valve of the utility model has the following beneficial effects:

[0020] The valve seat is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are communicated with the inner cavity of the valve seat respectively. The valve body is arranged on the opening at the top of the valve seat and closes the opening at the top of the valve seat. A sampling port is arranged on the top of the valve body, and the sampling port is communicated with the inner cavity of the valve seat. The valve core is movably arranged in the inner cavity of the valve seat along the direction of approaching and moving away from the sampling port, the first end of the valve core can enter and exit the sampling port, there is a gap between the first end of the valve core and the inner wall of the sampling port, and the valve core and the inner end of the sampling port can be detachably sealed to correspond to closing and opening the sampling port. The elastic member is sleeved on the second end of the valve core, and the elastic member is arranged between the valve core and the inner bottom wall of the valve seat to prevent the valve core from moving away from the sampling port. A first guide portion is arranged on the outer periphery of the valve core, and the first guide portion cooperates with the inner side wall of the valve seat so that the valve core remains in the direction of approaching and moving away from the sampling port when moving in the inner cavity of the valve seat. The scheme has a simple structure, easy operation, few parts, efficient assembly and low cost. The first guide portion replaces the existing guide structure at the top of the valve core to avoid crystallization between the outer wall at the top of the valve core and the sampling port, which may cause the valve core to be unable to reset, thereby preventing the sampling valve from leaking and extending the service life of the sampling valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A longitudinal sectional view of an embodiment of the utility model;

[0022] Figure 2 A three-dimensional diagram of a valve core according to an embodiment of the utility model;

[0023] Figure 3 It is a cross-sectional view of an embodiment of the utility model.

[0024] Part Number Description

[0025] 1-valve body; 11-sampling port; 2-valve seat; 21-liquid inlet; 22-liquid outlet; 3-valve core; 31-first guide part; 32-stop part; 33-pressing part; 34-recessed part; 4-second guide part; 5-elastic member; 6-sealing member. DETAILED DESCRIPTION

[0026] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0027] It should be noted that the diagrams provided in the present embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, so the diagrams only show the components related to the present invention rather than the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be changed at will, and the layout of the components may be more complicated. The structure, proportion, size, etc. shown in the diagrams attached to this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can be implemented, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effect and purpose that the present invention can produce. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of the implementation of the present utility model without substantially changing the technical content.

[0028] See also Figure 1The present embodiment provides a sampling valve, including a valve seat 2, a valve body 1, a valve core 3 and an elastic member 5. An inner cavity is provided in the valve seat 2, and the top is open, and the open port is connected to the inner cavity. A liquid inlet 21 and a liquid outlet 22 are provided on the outer periphery of the valve seat 2, and the liquid inlet 21 and the liquid outlet 22 are respectively connected to the inner cavity of the valve seat 2, and the liquid inlet 21 and the liquid outlet 22 are both horizontally arranged through holes. The bottom of the valve body 1 is open, and the valve body 1 is arranged on the valve seat 2, and the valve body 1 closes the top opening of the valve seat 2, and the valve body 1 is threadedly connected to the valve seat 2, and a sealing ring or a sealing gasket for sealing is arranged between the valve body 1 and the valve seat 2. The valve body 1 is provided with a sampling port 11 in the vertical direction, and the sampling port 11 is connected to the inner cavity of the valve seat 2, and the sampling port 11 is a through hole. The valve core 3 is movably arranged in the inner cavity of the valve seat 2 in the direction of approaching and moving away from the sampling port 11, and the top end of the valve core 3 can enter and exit the sampling port 11, so that the outer periphery of the valve core 3 abuts against and separates from the inner end of the sampling port 11 to correspondingly close and open the sampling port 11. Different from the sliding fit between the first end of the valve core 3 and the inner wall of the sampling port 11 in the prior art, in this embodiment, there is no sliding fit between the outer side surface of the first end of the valve core 3 and the circumferential surface of the inner wall of the sampling port 11, and there is a gap between the first end of the valve core 3 and the inner wall of the sampling port 11, and the sealing surface of the valve core 3 and the sampling port 11 is located at the inner end of the sampling port 11. The elastic member 5 is sleeved on the lower end of the valve core 3, and the elastic member 5 is arranged between the lower end of the valve core 3 and the bottom wall of the inner cavity of the valve seat 2, which is used to reset the valve core 3 upward to close the sampling port 11. The top periphery of the valve core 3 is provided with a first guide portion 31, and the first guide portion 31 cooperates with the inner cavity side wall of the valve seat 2, so that the valve core 3 can keep moving in the vertical direction. This solution has a simple structure, easy operation, few parts, efficient assembly, and low cost. The first guide portion 31 replaces the existing guide structure at the top of the valve core 3, thereby avoiding crystallization between the outer wall at the top of the valve core 3 and the sampling port 11, which causes the valve core 3 to be unable to reset, thereby avoiding leakage of the sampling valve and extending the service life of the sampling valve.

[0029] The sampling process of the sampling valve includes: the sampling end of the syringe is pressed downward against the top of the valve core 3, the valve core 3 moves downward, the lower end of the sampling port 11 is opened, and the dialysate flows from the inner cavity of the valve seat 2 into the sampling port 11 for the syringe to absorb for sampling. After the sampling is completed, the sampling end of the syringe no longer presses the top of the valve core 3, and the valve core 3 moves upward and resets under the elastic force of the elastic member 5, closing the lower end of the sampling port 11.

[0030] In one embodiment, if Figure 1 As shown, the first guide portion 31 includes a first protrusion arranged around the outer circumference of the valve core, and a gap is provided between the first protrusion and the inner cavity side wall of the valve seat 2 .

[0031] In one embodiment, if Figure 2 and Figure 3As shown, a plurality of recesses 34 are arranged at intervals along the circumferential direction on the outer periphery of the first protrusion, and the recesses 34 are recessed radially toward the inside of the first protrusion and vertically penetrate the first protrusion. The recesses 34 are arranged to allow the dialysate to pass through and flow to the sampling port 11, so as to facilitate sampling at the sampling port 11.

[0032] In one embodiment, if Figure 1 As shown, the sampling valve also includes a second guide portion 4 arranged between the outer periphery of the second end of the valve core 3 and the inner bottom wall of the valve seat 2, which forms a double insurance with the first guide portion 31 to improve the movement stability of the valve core 3 and avoid affecting the normal use of the sampling valve due to the tilting of the valve core 3 during the movement in the vertical direction.

[0033] In one embodiment, the second guide portion 4 includes a hollow convex column vertically arranged on the inner bottom wall of the valve seat 2, the bottom periphery of the valve core 3 is movably arranged in the inner cavity of the convex column, and the bottom end of the elastic member 5 is sleeved on the outer periphery of the convex column. The process of the convex column is simple and the guiding effect is good.

[0034] In one embodiment, if Figure 1 As shown, the second guide portion 4 includes a guide rib vertically arranged on the inner bottom wall of the valve seat 2, the bottom periphery of the valve core 3 is movably arranged in the guide rib, and the bottom end of the elastic member 5 is sleeved on the guide rib. The guide rib saves material and has a good guiding effect.

[0035] In one embodiment, a groove cooperating with the guide rib is vertically arranged on the outer periphery of the bottom end of the valve core 3 .

[0036] In one embodiment, a seal 6 is provided between the outer periphery of the first end of the valve core 3 and the material taking port 11 . The seal 6 includes a sealing gasket or a sealing ring to improve the sealing effect between the valve core 3 and the material taking port 11 .

[0037] In one embodiment, if Figure 1 As shown, a limiting structure for limiting the movement of the seal 6 in the vertical direction is provided on the valve core 3. The limiting structure includes a stopper 32 and a clamping portion 33 provided at both ends of the seal 6 to prevent the seal 6 from moving axially along the valve core 3 and affecting the sealing effect.

[0038] In one embodiment, if Figure 1 and Figure 3 As shown, the stopper 32 includes a step arranged on the outer periphery of the valve core 3, and the bottom end surface of the sealing member 6 abuts against the step.

[0039] In one embodiment, if Figure 1 and Figure 3 As shown, the pressing portion 33 includes a second protrusion arranged around the outer periphery of the top end of the valve core 3, and the bottom end surface of the second protrusion is against the top end surface of the sealing member 6 to press the sealing member 6 against the step.

[0040] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A sampling valve, characterized in that: include: A valve seat, wherein the valve seat is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are respectively connected to the inner cavity of the valve seat; A valve body is arranged on the valve seat, and a sampling port is arranged on the valve body, and the sampling port is communicated with the inner cavity of the valve seat; A valve core is movably disposed in the inner cavity of the valve seat in a direction close to and away from the sampling port, and a first end of the valve core can enter and exit the sampling port, a gap is provided between the first end of the valve core and the inner wall of the sampling port, and the valve core and the inner end of the sampling port are detachably sealed and matched to correspondingly close and open the sampling port; An elastic member, which is sleeved on the second end of the valve core and is disposed between the valve core and the inner bottom wall of the valve seat, and is used to prevent the valve core from moving away from the sampling port; The first guide portion is used to keep the valve core moving in a direction close to and away from the sampling port, and is arranged on the outer periphery of the valve core.

2. The sampling valve according to claim 1, characterized in that: The first guide portion includes a first protrusion disposed around the outer periphery of the valve core, and a gap is provided between the first protrusion and the inner side wall of the valve seat.

3. The sampling valve according to claim 2, characterized in that: A plurality of recessed portions for allowing dialysate to pass through are arranged at intervals along the circumferential direction on the outer periphery of the first protrusion.

4. The sampling valve according to any one of claims 1 to 3, characterized in that: The sampling valve further includes a second guide portion disposed between the outer periphery of the second end of the valve core and the inner bottom wall of the valve seat.

5. The sampling valve according to claim 4, characterized in that: The second guide portion includes a convex column arranged on the inner bottom wall of the valve seat, the second end of the valve core is movably arranged in the inner cavity of the convex column, and the second end of the elastic member is sleeved on the convex column.

6. The sampling valve according to claim 4, characterized in that: The second guide portion includes a guide rib arranged on the inner bottom wall of the valve seat, the second end of the valve core is movably arranged in the guide rib, and the second end of the elastic member is sleeved on the guide rib.

7. The sampling valve according to claim 1, characterized in that: A sealing member is provided between the outer periphery of the first end of the valve core and the sampling port.

8. The sampling valve according to claim 7, characterized in that: The valve core is provided with a limiting structure for limiting the seal to move along the axial direction of the valve core, and the limiting structure includes a stopper portion and a pressing portion provided at both ends of the seal.

9. The sampling valve according to claim 8, characterized in that: The stopper portion comprises a step arranged on the outer periphery of the valve core, and the first end of the sealing member abuts against the step.

10. The sampling valve according to claim 9, characterized in that: The pressing portion includes a second protrusion arranged around the outer circumference of the valve core, and the second protrusion abuts against the second end of the sealing member to press the sealing member onto the step.

Images