CN209858348U - Device for testing pipe bursting pressure under static condition - Google Patents

Abstract

The utility model discloses a device for testing the burst pressure of a conduit under a static condition, which belongs to the technical field of medical instrument detection, and comprises a main body, wherein a pressure device container is arranged in the main body, one end of the pressure device container is connected with a liquid pushing device in a sealing and sliding way, the other end of the pressure device container is provided with a liquid inlet and a liquid outlet, and the liquid outlet is communicated with a conduit interface; a ball screw transmission mechanism is formed between the liquid pushing device and the driving device; the opposite end of the driving device is provided with a constant temperature water bath box and a water delivery pipeline, a pressure sensor is arranged in the liquid outlet pipe, the driving device is provided with a controller, and the pressure sensor is connected with the controller of the driving device. The utility model discloses the technical scheme of example realizes supplying with the fluid of stable speed in the pipe to guarantee in the test process that the pipe is in the constant temperature environment, accord with industry standard's experimental requirement.

Description

Device for testing pipe bursting pressure under static condition

Technical Field

The utility model belongs to the technical field of the medical instrument inspection, specific testing arrangement of pipe burst pressure under static condition that says so is applicable to and carries out the test of burst pressure under the static condition to power injection type pipe.

Background

In clinical application, catheter products are often used to rapidly and stably deliver liquids such as contrast agents, high-concentration drugs and the like into a patient under high pressure, so as to realize clinical applications such as contrast and treatment. Common dynamic injection catheters include intravascular catheters such as contrast catheters, microcatheters, support catheters, central venous catheters, implantable drug delivery devices, partial trocar peripheral catheters and the like.

Contrast catheters and the like are commonly used in operative treatment such as radiation interventional diagnosis and treatment and are used for being inserted into a vascular system, injecting or inputting contrast media and the like, and performing angiography or operative treatment on the vascular system by using image diagnosis. Common clinical applications such as coronary angiography are common, and coronary heart disease (also called ischemic heart disease) is the first cause of death worldwide, so the catheters are widely applied clinically. Central venous catheters and implantable drug delivery devices can provide patients with long-term chemotherapy, intravenous nutrition and medication routes, and high-pressure resistant central venous catheters are commonly used for intravenous infusion of high-concentration drugs and nutrients.

The intravascular catheter is a high-risk medical instrument for national key supervision as an interventional medical instrument for a human body circulatory system. Wherein, the high pressure resistant power injection catheter has higher injection pressure, higher injection speed and larger injection amount, so the stability and quality safety under the high pressure condition of the catheter directly influence the clinical operation quality and the life safety of patients. Therefore, the method has great clinical application significance for the research on the quality of the power injection catheter.

Currently, the industry standard YY0285.1-2017 "sterile catheter for single use in intravascular catheters part 1" in type test: the general requirements are about to be implemented, but no relevant detection mechanism exists in China, and manufacturers have a quality performance testing system capable of covering common power injection catheters. Therefore, there is a need to develop related research to provide technical support for the supervision of related medical devices.

Relevant standards related to the quality performance test of the intravascular dynamic injection catheter are YY0285.1-2017 part 1 of intravascular catheter disposable sterile catheter: general requirements, however, the standard only gives a schematic diagram of a basic research method and a simple test device, and in clinical application, the variety of catheters for power injection is large, and the differences between the catheter size and the injection pressure are large, so that specific test schemes and test devices need to be further discussed and researched.

The experimental requirements of the test of the burst pressure under the static condition are summarized in appendix F of the medical instrument industry standard YY0285.1-2017 in a normative way, in the experimental process, the test liquid needs to be supplied to the test conduit at a stable speed, and if the fluid can not be output at a stable flow speed, the pressure fluctuation caused by the flow speed fluctuation possibly causes the leakage or burst of the test conduit, so that the accurate test result can not be obtained. Meanwhile, when the pipe is tested for burst pressure under a static condition, the fluid in the test chamber needs to be kept at a constant temperature in the test process, and reliable precautionary measures and safety precautionary measures need to be taken for the pipe to protect a test operator from the danger of fluid leakage caused by failure of a pressurization system and high pressure.

Based on the actual demands, the testing device for the burst pressure under the static condition is designed, and the problem to be solved at present is solved.

SUMMERY OF THE UTILITY MODEL

In order to solve the deficiencies of the prior art, the utility model aims to provide a device for testing the burst pressure of a catheter under a static condition, which can keep the test liquid injected into the test catheter at a stable speed and can adjust the injection speed to meet different test requirements; in addition, the temperature of the fluid in the test chamber can reach the target temperature, and the temperature can be kept in the test process, so that reliable safety precaution measures are provided for the test conduit, and the test requirement of the industrial standard is met.

The utility model provides a technical scheme that its technical problem adopted does:

the device comprises a main body, wherein a pressure device container is arranged in the main body, one end of the pressure device container is connected with a liquid pushing device in a sealing and sliding mode, the other end of the pressure device container is provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the liquid feeding container through a liquid inlet pipe, and the liquid outlet is communicated with a guide pipe connector through a liquid outlet pipe; one side of the liquid pushing device, which is back to the pressure device container, is connected with a transmission sheath, the transmission sheath is matched with a lead screw to form a ball screw transmission mechanism, and one end of the lead screw, which is far away from the transmission sheath, is connected with a driving device;

a thermostatic water bath box is arranged at one end opposite to the driving device, a protective sleeve connector, a water inlet pipe connector and a second water return pipe connector which are used for connecting a water conveying pipeline are arranged on the thermostatic water bath box, and the conduit connector is positioned on the end face of the protective sleeve connector; a water storage tank is arranged on the water conveying pipeline, a water inlet and a water outlet are formed in the water storage tank, the water inlet is higher than the water outlet, and a first circulating pump is arranged in the constant-temperature water bath tank to enable water to form closed circulation in the water conveying pipeline and the water storage tank;

the liquid outlet pipe is characterized in that a pressure sensor is arranged at a position close to the catheter connector in the liquid outlet pipe, the driving device is provided with a controller, the controller is connected with an operation panel, a display screen and a driving device operation button are arranged on the operation panel, the pressure sensor is connected with the controller of the driving device, and the pressure sensor is connected to the display screen through a transmitter.

Furthermore, the water conveying pipeline comprises a protective sleeve, a water inlet pipe, a first water return pipe and a second water return pipe, the protective sleeve, the water inlet pipe and the second water return pipe are detachably connected with corresponding interfaces on the constant-temperature water bath box in an inserting manner, the water inlet pipe is positioned at one end of the protective sleeve, the first water return pipe is positioned at the other end of the protective sleeve, and the water inlet pipe and the first water return pipe are communicated with the protective sleeve; one end of the first water return pipe, which is far away from the protective sleeve, is communicated to a water inlet of the water storage tank, and one end of the second water return pipe, which is far away from the constant-temperature water bath tank, is communicated to a water outlet of the water storage tank.

Furthermore, one or more guide rails are arranged in the main body, the guide rails are parallel to the lead screw, a raised guide plate is arranged on the outer side of the transmission sheath, and the guide rails penetrate through the guide plate and are in sliding fit with the guide plate.

Furthermore, the positions of the inner side of the main body, which correspond to the two ends of the stroke of the transmission sheath, are respectively provided with a limiting plate, and the tail end of the limiting plate extends to the inner side of the edge of the guide plate so as to prevent the transmission sheath from continuously moving.

Optionally, a travel switch is arranged at a contact position of the limiting plate and the guide plate, and the travel switch is electrically connected with a controller of the driving device. And a travel switch is arranged, a feedback can be sent to the controller through the travel switch, the controller sends a signal to the driving device, at the moment, the transmission sheath reaches the end point of the travel, and the driving device stops rotating after receiving the signal.

Furthermore, a fixing device for fixing the protective sleeve on the protective sleeve interface is arranged at the connecting end of the protective sleeve and the protective sleeve interface.

An alternative solution for the fixation device is: the fixing device is a hoop.

Another alternative solution for the fixing device is: the fixing device is of a tubular structure, one end of the fixing device is matched with the protective sleeve interface, and the other end of the fixing device is matched with the protective sleeve;

one end of the fixing device, which is matched with the protective sleeve interface, is an equal-diameter threaded pipe, and the protective sleeve interface is correspondingly provided with threads so as to realize threaded connection of the fixing device and the protective sleeve interface;

one end of the fixing device, which is matched with the protective sleeve, is a conical pipe with a smooth inner wall, the inner diameter of the conical pipe is gradually reduced from one end connected with the threaded pipe to the other end, and the minimum diameter part of the conical pipe is in interference fit with the protective sleeve.

Furthermore, a constant-temperature heating device is arranged in the liquid adding container, the liquid adding container is communicated with a second circulating pump, a circulating pipeline is communicated between the pressure device container and the liquid adding container, and the second circulating pump drives fluid to form closed circulation among the liquid adding container, the liquid inlet pipe, the pressure device container and the circulating pipeline.

Further, the inside of constant temperature water bath is provided with the constant temperature water bath, the outside of constant temperature water bath is provided with digital display temperature controller, heating switch and first circulating pump switch, digital display temperature controller, heating switch are connected with the constant temperature water bath respectively, first circulating pump switch is connected with first circulating pump.

Furthermore, a driving box is arranged at one end of the main body, which is provided with a driving device, the driving device is positioned in the driving box, and the operation panel is positioned outside the driving box; the front end of the driving box protrudes out of the main body to form a first protruding part, the front end of the constant-temperature water bath box protrudes out of the main body to form a second protruding part, and the first protruding part and the second protruding part are symmetrically arranged; the protective sleeve joint, the conduit joint, the water inlet pipe joint and the second water return pipe joint are all arranged on the side face of the second bulge part opposite to the first bulge part.

Preferably, the liquid feeding container is arranged on the top surface of the constant-temperature water bath box, the display and operation part, the warming switch and the first circulating pump switch of the digital display temperature controller are arranged on the front side surface of the second protruding part, and the operation panel of the driving device is arranged on the front side surface of the first protruding part, so that the operation and the checking are facilitated. The side wall of the liquid adding container can be provided with a transparent part so as to be convenient for people to check the liquid level, and the whole liquid adding container can also be made of transparent materials.

Further, the outside of main part is provided with the safety cover, the safety cover setting is between first bulge and second bulge, and the safety cover includes diaphragm and riser, diaphragm one side articulates the top edge at the main part, the opposite side and the riser fixed connection of diaphragm, and diaphragm and riser are corresponding with the edge of first bulge and second bulge.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses the testing arrangement of pipe burst pressure under static condition of example supplies liquid in to experimental pipe through pressure device container, liquid pusher and screw drive mechanism cooperation, can keep experimental liquid to inject into experimental pipe with 1 mL/s's speed to the rotational speed of lead screw is adjusted to the rotational speed that drive arrangement was adjusted to the accessible, realizes the experimental demand of the regulation in order to satisfy the difference of injection speed.

2. For the conduit of power injection type, the test of burst pressure under the static condition and the test of flow and pressure in the power injection are two very important performance test tests, the test device of the conduit burst pressure under the static condition of the utility model provides a liquid supply for the test conduit through a ball screw transmission mechanism, the safety is high, the high precision cooperation between a liquid pushing device and a pressure device container realizes the complete elimination of bubbles in the pressure device container, simultaneously, a pressure sensor is arranged to realize the real-time feedback and compensation of pressure, the high-pressure steady-state output of test liquid is realized, on the basis of meeting the test requirement of the test of the conduit burst pressure, the test requirement of the test of flow and pressure in the conduit power injection can be met, the integration of two tests on one device is realized, the water conveying pipeline is separated from a constant temperature water bath box firstly, the flow and pressure in power injection are tested, then the water conveying pipeline is connected with the constant-temperature water bath box, the bursting pressure is tested under the static condition, the reference value of the test result obtained by the same equipment is higher, and the blank of the test equipment is filled.

3. The device for testing the burst pressure of the guide pipe under the static condition, which is exemplified by the utility model, is provided with the constant temperature water bath box to ensure that the temperature of the fluid for the test reaches the target temperature, such as (37 +/-2) DEG C, the device accords with the test requirement and keeps the temperature in the test process, the test guide pipe interface is arranged at the inner side of the protective sleeve interface, thereby leading the test guide pipe to be positioned inside the protective sleeve, after the water in the water storage tank is heated by the constant temperature water bath box, the fluid which accords with the test temperature requirement enters the protective sleeve through the water inlet pipe, then enters the water storage tank through the first water return pipe and flows back to the constant temperature water bath box through the second water return pipe to form circulation, the water level in the water storage tank is kept between the water inlet and the water outlet, the air bubbles in the water conveying pipeline can be conveniently discharged, the test guide pipe is positioned, and make the test pipe be in the constant temperature environment at whole test process, protective case plays the safety protection effect to the test pipe simultaneously, causes danger to test operating personnel when avoiding the test pipe blasting, accords with the test requirement of burst pressure under the static condition, convenient to use just does benefit to experimental going on smoothly.

4. The utility model discloses the testing arrangement of pipe burst pressure under static condition of example sets up the deflector on the transmission sheath to and the setting runs through the deflector, with the parallel guide rail of lead screw, the guide rail forms the restraint at the deflector rather than cooperation department to the deflector, and then forms the restraint to the transmission sheath, further guarantees to push away liquid device and keeps sharp propulsion, guarantees to push away the leakproofness of complex between liquid device and the pressure device container, guarantees to supply liquid speed's stability.

5. The utility model discloses static condition lower conduit burst pressure's testing arrangement is provided with the limiting plate, and the transmission sheath can automatic shutdown after arriving the stroke end, has increased the convenience of operation, and the deflector can sound with the limiting plate contact, and whether operating personnel can be convenient know the pressure device container inside and be full of test liquid.

6. The utility model discloses the testing arrangement of pipe burst pressure under static condition of example sets up constant temperature heating device in the liquid feeding container to form a circulation path through the circulating pump between liquid feeding container and the pressure device container, before experimental, can preheat the inner chamber of test liquid and pressure device container, make the test liquid be close human body temperature more, improve the accuracy of test result.

7. The device for testing the pipe bursting pressure under the static condition of the example of the utility model encloses a space for accommodating the detected instrument through the first bulge, the main body and the second bulge, and has compact structure and reasonable space utilization; the protection cover is arranged, so that the space for accommodating the detected instrument can be covered when the test is finished, important parts such as a catheter interface are protected, and the test device is prevented from being damaged accidentally.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic diagram of an external structure of a testing device according to an embodiment of the present invention;

FIG. 2 is a schematic view showing the internal structure of a test liquid supply part of the test apparatus according to the embodiment of the present invention;

FIG. 3 is a schematic view showing an internal structure of a test liquid supply part of the test apparatus according to the embodiment of the present invention;

FIG. 4 is a schematic view showing the internal structure of the test liquid supply part of the test apparatus according to the embodiment of the present invention in another direction;

FIG. 5 is a schematic structural view of a water circulation part of a testing device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a protective casing interface and a catheter interface of a testing device according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a fixing device of a testing device according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of another fixing device of a testing device according to an embodiment of the present invention.

In the figure: 1 main body, 2 driving box, 3 liquid adding container, 4 constant temperature water bath box, 5 digital display temperature controller, 6 heating switch, 7 first circulating pump switch, 8 display screen, 9 driving device operating button, 10 protective cover, 11 first bulge, 12 second bulge, 13 water inlet pipe, 14 protective sleeve interface, 15 conduit interface, 16 water storage tank, 17 upper cover, 18 protective sleeve, 19 first return pipe, 20 second return pipe, 21 water inlet, 22 water inlet pipe interface, 23 second return pipe interface, 24 operating panel, 25 switch, 26 liquid inlet pipe, 27 liquid outlet pipe, 28 circulating conduit, 29 pressure device container, 30 liquid pushing device, 31 transmission sheath, 32 guide plate, 33 limiting plate, 34 lead screw, 35 driving device, 36 controller, 37 computer, 38 pressure sensor, 39 one-way valve, 40 second circulating pump, 41 test conduit, 42 waste liquid recovery container, 43 guide rail, 44 water outlet, 45 clamp, 46 screw pipe and 47 taper pipe.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention.

The components of the embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do 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 thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

As shown in fig. 1-5, an embodiment of the present invention provides a device for testing the burst pressure of a conduit under a static condition, which includes a main body 1, a pressure device container 29 is disposed inside the main body 1, one end of the pressure device container 29 is connected with a liquid pushing device 30 in a sliding and sealing manner, the other end of the pressure device container 29 is provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the liquid adding container 3 through a liquid inlet pipe 26, and the liquid outlet is communicated with a conduit interface 15 through a liquid outlet pipe 27; one side of the liquid pushing device 30, which is back to the pressure device container 29, is connected with a transmission sheath 31, the transmission sheath 31 is matched with a lead screw 34 to form a ball screw transmission mechanism, and one end, far away from the transmission sheath 31, of the lead screw 34 is connected with a driving device 35.

A thermostatic water bath box 4 is arranged at one end opposite to the driving device 35, a protective casing pipe interface 14 for connecting a water conveying pipeline, a water inlet pipe interface 22 and a second water return pipe interface 23 are arranged on the thermostatic water bath box 4, and the conduit interface 15 is positioned on the end face of the protective casing pipe interface 14; the water conveying pipeline is provided with a water storage tank 16 with an opening at the top end, the water storage tank 16 is provided with a water inlet 21 and a water outlet 44, the height of the water inlet 21 is higher than that of the water outlet 44, and the constant temperature water bath tank 4 is internally provided with a first circulating pump so as to enable water to form closed circulation in the water conveying pipeline and the water storage tank 16.

The position that is close to pipe interface 15 in drain pipe 27 is provided with pressure sensor 38, drive arrangement 35 is provided with controller 36, controller 36 is connected with operating panel 24, is provided with display screen 8 and drive arrangement operating button 9 on operating panel 24, pressure sensor 38 is connected with drive arrangement 35's controller 36, and pressure sensor 38 is connected to through the changer display screen 8 to realize that pressure sensor 38 detects the demonstration of numerical value on display screen 8.

Specifically, the driving device 35 adopts a servo motor that rotates forward and backward, and the controller 36 adopts a servo driver or a single chip microcomputer and the like that is matched with the servo motor. The controller 36 of the driving device 35 is further connected to a computer 37, and the computer 37 can control the controller 36 and view and collect data.

As shown in fig. 5, the water conveying pipeline includes a protective sleeve 18, a water inlet pipe 13, a first water return pipe 19 and a second water return pipe 20, the protective sleeve 18, the water inlet pipe 13 and the second water return pipe 20 are detachably connected with corresponding interfaces of the constant temperature water bath tank 4 in an inserting manner, the water inlet pipe 13 is located at one end of the protective sleeve 18, the first water return pipe 19 is located at the other end of the protective sleeve 18, and the water inlet pipe 13 and the first water return pipe 19 are both communicated with the protective sleeve 18; the end of the first water return pipe 19 away from the protective sleeve 18 is communicated with the water inlet 21 of the water storage tank 16, and the end of the second water return pipe 19 away from the constant temperature water bath tank 4 is communicated with the water outlet 44 of the water storage tank 16.

Protective sleeve 18, inlet tube 13, first return pipe 19 and second return pipe 20 are transparent hose, and is concrete, can adopt transparent plastic hose, and the condition of flowing of the fluid in raceway inside is observed to the experimenter directly perceivedly of being convenient for, also can be convenient simultaneously observe revealing or blasting of experimental pipe 41, convenient to use. The water storage tank 16 is a water storage container with an open top end, the top opening of the water storage tank 16 is provided with an upper cover 17 which can be opened, the water storage tank 16 can also be made of plastics, the upper cover 17 of the water storage tank 16 can be opened in the test process, the conditions such as the water level line inside the water storage tank can be conveniently observed, and the water storage tank is convenient for a tester to use.

One or more guide rails 43 are arranged inside the main body 1, preferably, a plurality of guide rails 43 are arranged, the guide rails 43 are parallel to the lead screw 34, the lead screw 34 is arranged at the center, the guide rails 43 are symmetrically arranged or uniformly arranged around the lead screw 34, a raised guide plate 32 is arranged outside the transmission sheath 31, and the guide rails 43 penetrate through the guide plate 32 and are in sliding fit with the guide plate 32. The guide rail 43 forms a constraint on the guide plate 32 at the position where the guide plate 32 is matched with the guide plate, so as to form a constraint on the transmission sheath 31, further ensure that the liquid pushing device 30 keeps linear pushing, and ensure the matching tightness between the liquid pushing device 30 and the pressure device container 29.

The positions of the inner side of the main body 1, which correspond to the two ends of the stroke of the transmission sheath 31, are respectively provided with a limiting plate 33, the tail end of the limiting plate 33 extends to the inner side of the edge of the guide plate 32, and when the transmission sheath 31 moves to the limiting position, the guide plate 32 can touch the limiting plate 33 to prevent the transmission sheath 31 from moving continuously. Be provided with limiting plate 33, can automatic stop after transmission sheath 31 reaches the stroke end, increased the convenience of operation, deflector 32 can make a sound with the contact of limiting plate 33, and whether operating personnel can be convenient knows pressure device container 29 is inside to be full of test liquid.

The inside of constant temperature water bath 4 is provided with the constant temperature water bath, the outside of constant temperature water bath 4 is provided with digital display temperature controller 5, heat switch 6 and first circulating pump switch 7, digital display temperature controller 5, heat switch 6 are connected with the constant temperature water bath respectively, first circulating pump switch 7 is connected with first circulating pump. The first circulating pump drives fluid to enter the constant temperature water bath from the water storage tank 16 through the second water return pipe 20, and the fluid flows through the water inlet pipe 13, the protective sleeve 18 and the first water return pipe 19 in sequence after being heated by the constant temperature water bath and flows back to the water storage tank 16 to form a circulating water path. The constant temperature water bath kettle and the circulating pump are existing mature equipment, technicians can purchase the constant temperature water bath kettle from the market, meanwhile, the constant temperature water bath kettle in the prior art is provided with a digital display temperature controller, the connection of a switch in a circuit is also basic knowledge in the field, and the specific structure of the constant temperature water bath kettle and the circulating pump is not repeated.

The main body 1 is provided with a driving box 2 at one end provided with a driving device 35, the driving device 35 is positioned in the driving box 2, and an operation panel is positioned outside the driving box 2; the front end of the driving box 2 protrudes out of the main body 1 to form a first protruding part 11, the front end of the constant temperature water bath box 4 protrudes out of the main body 1 to form a second protruding part 12, and the first protruding part 11 and the second protruding part 12 are symmetrically arranged; the protective casing joint 14, the conduit joint 15, the water inlet joint 22 and the second water return joint 23 are all arranged on the side surface of the second bulge part 12 opposite to the first bulge part 11. The first protruding part 11, the side wall of the main body 1 and the second protruding part 12 together enclose a space for accommodating the detected instrument, the structure is compact, and the space utilization is reasonable.

The liquid adding container 3 is arranged on the top surface of the constant temperature water bath box 2, the display and operation part of the digital display temperature controller 5, the warming switch 6 and the first circulating pump switch 7 are arranged on the front side surface of the second bulge part 12, and the operation panel of the driving device 35 is arranged on the front side surface of the first bulge part 11, so that the operation and the checking are convenient. The driving device operating button 9 on the operating panel is connected with the controller 36 of the driving device 35 to realize the input of the instruction to the controller 36, and the display screen 8 is respectively connected with the controller 36 and the pressure sensor 38. The liquid feeding container 3 is a groove-shaped container with an opening at the top end, an upper cover is arranged at the opening, a transparent part can be arranged on the side wall of the liquid feeding container 3 so as to facilitate people to check the liquid level, the whole liquid feeding container can also be made of transparent materials, and the liquid feeding container 3 is made of transparent plastics.

The outside of main part 1 is provided with safety cover 10, safety cover 10 sets up between first bulge 11 and second bulge 12, and safety cover 10 includes diaphragm and riser, diaphragm one side articulates the top edge at main part 1, the opposite side and the riser fixed connection of diaphragm, and diaphragm and riser are corresponding with the edge of first bulge 11 and second bulge 12. When the test is carried out, the protective cover 10 is lifted, after the test is finished, the protective cover 10 can be buckled down, important parts such as the catheter interface 15 and the like and equipment on the test bed are protected, and the test device is prevented from being accidentally damaged. The protective cover 9 of this embodiment is made of a transparent plastic plate.

The working method of the embodiment is as follows:

s1: the liquid adding container 3 is filled with test liquid;

s2: installing a test conduit 41 at the conduit interface 15;

s3: the driving device 35 is started, a power output part of the driving device 35 drives the lead screw 34 to rotate in situ, and the transmission sheath 31 drives the liquid pushing device 30 to move linearly so as to suck the test liquid from the liquid adding container 3 into the pressure device container 29;

s4: the power output part of the driving device 35 rotates reversely, the test liquid is pressed into the test conduit 41, the gas in the test conduit 41 is discharged, and then the test conduit 41 is closed; in specific operation, the test conduit 41 can be closed by a clamp;

s5: connecting a water pipeline to the constant-temperature water bath box 2, specifically, connecting a protective sleeve 18 with a protective sleeve interface 14 in a splicing manner, connecting a water inlet pipe 13 with a water inlet pipe interface 22 in a splicing manner, connecting a second water return pipe 20 with a second water return pipe interface 23 in a splicing manner, as shown in fig. 6, locating a conduit interface 15 on the end face of the protective sleeve interface 14, and locating a test conduit 41 inside the protective sleeve 18;

s6: adding water into the water storage tank 16 and enabling the water level in the water storage tank 16 to be positioned between the water inlet 21 and the water outlet 44;

s7: the first circulating pump is started, water in the water storage tank 16 circularly flows in the water conveying pipeline after being heated by the constant-temperature water bath tank, gas in the water conveying pipeline is discharged, and the test conduit reaches thermal balance; the specific circulation path is as follows: the water in the water storage tank 16 enters the constant temperature water bath through the second water return pipe 20, is heated by the constant temperature water bath, and then flows back to the water storage tank 16 through the water inlet pipe 13, the protective sleeve 18 and the first water return pipe 19 in sequence to form a circulating water path. The water level in the water storage tank 16 is kept between the water inlet and the water outlet, so that bubbles in the water conveying pipeline can be conveniently discharged, the test conduit 41 is positioned in the protective sleeve 18 and can be immersed in the fluid in the protective sleeve 18 to achieve thermal balance, and meanwhile, the protective sleeve 18 plays a role in safety protection for the test conduit 41.

S8: adjusting the rate of supply of the test fluid by the controller 36 of the actuator 35 to cause the pressure device vessel 29 to supply a steady rate of test fluid to the test conduit 41 to generate sufficient pressure to cause the test conduit 41 to leak or burst; when the liquid supply rate is adjusted, the rotating speed of the driving device 35 is adjusted, so that the test liquid can be kept injected into the test conduit at the rate of 1mL/s, and different injection rates can be adjusted to meet different test requirements.

S9: the test fluid is injected from the pressure vessel 29 into the closed test conduit 41 until the test conduit 41 leaks or bursts.

S10: during pressurization of the test apparatus, the pressure at the inlet of the test conduit 41 is recorded and the maximum pressure that can be achieved is noted for the purpose of preparing a test report.

For ease of understanding, the specific steps of the operation method are described in a certain order in this embodiment, however, this does not mean that the present invention must be implemented in this order, for example, the order of S1 and S2 may be reversed. It will be further appreciated that when the gas in the test tube 41 is exhausted, the end of the test tube 41 is placed in the waste liquid collecting container 42 to ensure the cleanliness of the test bed and facilitate the disposal of waste liquid.

The testing device of the embodiment can be debugged firstly when used for the first time or used again after being not used for a long time, and the debugging specifically comprises: the driving device 35 is started to repeatedly suck and discharge the test liquid until the gas in the pressure device container 29 is completely discharged. The test solution can be prepared by mixing glycerol and water, and the dynamic viscosity of the test solution is within +/-5% of that of the target injection (such as contrast solution).

The pressure sensor 38 has two modes, automatic and manual, for feedback of the drive 35 and for control of the rotational speed of the drive 35:

in the automatic mode, a target injection rate is set on the controller 36, the lead screw 34 accelerates until the target injection rate is reached, the controller 36 feeds back the target injection rate to the driving device 35, and the driving device 35 drives the lead screw 34 to keep running at the speed, so that the injection rate is kept constant.

In the manual mode, a tester sets the rotating speed of the driving device 35 through the driving device operation button 9, gradually increases until the target injection rate is reached, and displays the target injection rate from the display screen 8. When the target speed is observed to be reached, the acceleration is stopped, and the driving device 35 drives the lead screw 34 to keep the speed running, so that the liquid injection speed is kept constant.

The driving device operation buttons 9 comprise on, off, acceleration, deceleration and other buttons, and the pressure at the catheter interface 15 is detected by the pressure sensor 38 and displayed by the display screen 8, so that people can observe the pressure visually.

It can be understood that, in order to ensure that the test liquid can only enter the pressure device container 29 from the liquid adding container 3 during the suction and can only enter the test conduit 41 from the pressure device container 29 during the discharge, the check valves 39 can be arranged on the liquid inlet pipe 26 and the liquid outlet pipe 27 to standardize the flow direction of the test liquid and ensure the smooth operation of the test. And the complete sealing between the pressure device container 29 and the liquid pushing device 30 can be further ensured by adopting high-precision processing modes such as honing and the like, arranging a sealing ring at a key part, arranging a rubber head at the end part of the liquid pushing device 30 and the like.

In specific implementation, a constant temperature heating device can be further arranged in the liquid adding container 3, the liquid adding container 3 is communicated with a second circulating pump 40, a circulating pipeline 28 is communicated between the pressure device container 29 and the liquid adding container 3, and the second circulating pump 40 drives fluid to form closed circulation among the liquid adding container 3, the liquid inlet pipe 26, the pressure device container 29 and the circulating pipeline 28. Before the test begins, the test liquid is heated in the liquid adding container 3, and is sucked into the pressure device container 29, the switch 25 of the circulating pipeline 28 is opened, the second circulating pump 40 is started, so that the test liquid circulates for a proper time between the liquid adding container 3 and the pressure device container 29, the preheating of the device and the test liquid is completed, the temperature of the test liquid is enabled to be closer to the body temperature of a human body, then the circulating pipeline 28 is closed through the switch 25, the test is carried out, and the reliability of the test result is further improved.

In addition, a travel switch may be provided at a portion where the stopper plate 33 contacts the guide plate 32, and the travel switch may be electrically connected to the controller 36 of the driving device 35. A travel switch is provided, and a feedback can be given to the controller 36 through the travel switch, and the controller 36 sends a signal to the driving device 35, when the transmission sheath 31 reaches the end point of the travel, and the driving device 35 stops rotating after receiving the signal.

In general, since the protection sleeve 18 is a plastic hose, which has elasticity, the connection between the protection sleeve 18 and the protection sleeve interface 14 can be achieved by the tension force of the protection sleeve 18 and the friction force between the protection sleeve 18 and the protection sleeve interface 14, and the protection sleeve 18 and the protection sleeve interface 14 cannot easily fall off, but in order to ensure that the protection sleeve 18 cannot accidentally fall off, the connection end of the protection sleeve 18 and the protection sleeve interface 14 may be provided with a fixing device for fixing the protection sleeve 18 on the protection sleeve interface 14. One form of construction of the securing device is shown in fig. 7 and may be provided by a clip 45, the annular band of the clip 45 passing around the protective sleeve 18 and securing the protective sleeve 18 to the protective sleeve interface 14 to prevent accidental removal, and after the test is completed, the securing device is released and the protective sleeve 18 is removed.

The fixing device can also adopt the structure shown in fig. 8, and the fixing device is a tubular structure with one end matched with the protective sleeve interface 14 and the other end matched with the protective sleeve 18; one end of the fixing device, which is matched with the protective casing interface 14, is a threaded pipe 46 with equal diameter, and the protective casing interface 14 is correspondingly provided with threads so as to realize threaded connection of the protective casing interface and the protective casing interface; one end of the fixing device, which is matched with the protective sleeve 18, is a tapered tube 47 with a smooth inner wall, the inner diameter of the tapered tube 47 is gradually reduced from one end connected with the threaded tube 46 to the other end, and the minimum diameter part of the tapered tube 47 is in interference fit with the protective sleeve 18.

Because the protective sleeve 18 is a flexible tube, the fixing device can move on the protective sleeve 18 before the protective sleeve 18 is not inserted into the protective sleeve interface 14, when the fixing device is adopted, the water inlet pipe 13 and the test conduit interface 15 can be properly lengthened, the communication part of the water inlet pipe 13 and the protective sleeve 18 is properly moved backwards, but the backward movement distance cannot be too large, so that the test conduit 41 cannot be completely immersed into the fluid. Fixing device sets up between the tip of protective sheath 18 and inlet tube 13, and after protective sheath 18 inserted protective sheath interface 14, with fixing device's screwed pipe 46 and protective sheath interface 14 mesh mutually, along with the screwing up of screw-thread fit department, protective sheath 18 chucking gradually is prevented on protective sheath interface 14 by conical tube 47, prevents it and drops, unscrews fixing device after experimental completion, takes off protective sheath 18. In order to facilitate the operation of attaching and detaching the fixture, a boss 48 may be provided between the threaded tube 46 and the tapered tube 47, and the boss 48 may be pinched when attaching and detaching the fixture.

The utility model discloses the testing arrangement of example, both can carry out the test of blast pressure under the pipe static condition, also can carry out the test of power injection medium flow and pressure, during the operation, earlier separate conduit and thermostatic bath 4 with water piping, connect test pipe 41 to pipe connection 15 through the connecting pipe, install the manometer at the junction of test pipe 41 and connecting pipe, place test pipe 41 end in the waste liquid recovery container, through drive arrangement 35 drive lead screw 34 rotation with the test liquid of pressure device container 29 in with the stable velocity of flow of high pressure about 8Mpa impress test pipe 41, carry out the test of power injection medium flow and pressure; after the tests of the flow and the pressure in the power injection are finished, the connecting pipe and the pressure gauge are taken down, the test conduit 41 is directly connected to the conduit interface 15, the water conveying pipeline is connected with the corresponding interface of the constant-temperature water bath tank, and the test of the burst pressure under the static condition is carried out according to the steps. The two tests are carried out by the same equipment, and the result is more valuable.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Besides the technical features described in the specification, other technical features are known to those skilled in the art, and further description of the other technical features is omitted here in order to highlight the innovative features of the present invention.

Claims (9)

1. A device for testing the pipe bursting pressure under a static condition is characterized by comprising a main body, wherein a pressure device container is arranged in the main body, one end of the pressure device container is connected with a liquid pushing device in a sealing and sliding manner, the other end of the pressure device container is provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the liquid feeding container through a liquid inlet pipe, and the liquid outlet is communicated with a pipe connector through a liquid outlet pipe; one side of the liquid pushing device, which is back to the pressure device container, is connected with a transmission sheath, the transmission sheath is matched with a lead screw to form a ball screw transmission mechanism, and one end of the lead screw, which is far away from the transmission sheath, is connected with a driving device;

a thermostatic water bath box is arranged at one end opposite to the driving device, a protective sleeve connector, a water inlet pipe connector and a second water return pipe connector which are used for connecting a water conveying pipeline are arranged on the thermostatic water bath box, and the conduit connector is positioned on the end face of the protective sleeve connector; a water storage tank is arranged on the water conveying pipeline, a water inlet and a water outlet are formed in the water storage tank, the water inlet is higher than the water outlet, and a first circulating pump is arranged in the constant-temperature water bath tank to enable water to form closed circulation in the water conveying pipeline and the water storage tank;

the liquid outlet pipe is characterized in that a pressure sensor is arranged at a position close to the catheter connector in the liquid outlet pipe, the driving device is provided with a controller, the controller is connected with an operation panel, a display screen and a driving device operation button are arranged on the operation panel, the pressure sensor is connected with the controller of the driving device, and the pressure sensor is connected to the display screen through a transmitter.

2. The device for testing the burst pressure of the guide pipe under the static condition as claimed in claim 1, wherein the water conveying pipeline comprises a protective sleeve, a water inlet pipe, a first water return pipe and a second water return pipe, the protective sleeve, the water inlet pipe and the second water return pipe are detachably connected with corresponding interfaces on the constant temperature water bath box in an inserting manner, the water inlet pipe is positioned at one end of the protective sleeve, the first water return pipe is positioned at the other end of the protective sleeve, and the water inlet pipe and the first water return pipe are both communicated with the protective sleeve; one end of the first water return pipe, which is far away from the protective sleeve, is communicated to a water inlet of the water storage tank, and one end of the second water return pipe, which is far away from the constant-temperature water bath tank, is communicated to a water outlet of the water storage tank.

3. The device for testing the burst pressure of the guide pipe under the static condition as claimed in claim 2, wherein one or more guide rails are arranged in the main body, the guide rails are parallel to the lead screw, a raised guide plate is arranged outside the transmission sheath, and the guide rails penetrate through the guide plate and are in sliding fit with the guide plate.

4. The device for testing the burst pressure of the guide pipe under the static condition as claimed in claim 3, wherein the inner side of the main body is provided with a limiting plate corresponding to the two ends of the stroke of the transmission sheath, and the tail end of the limiting plate extends to the inner side of the edge of the guide plate to prevent the transmission sheath from moving continuously.

5. The device for testing the burst pressure of a conduit under static conditions as claimed in any one of claims 1 to 4, wherein the end of the protective sleeve connected to the interface of the protective sleeve is provided with a fixing means for fixing the protective sleeve to the interface of the protective sleeve.

6. The apparatus for testing the burst pressure of a catheter under static conditions as claimed in any one of claims 1 to 4, wherein a constant temperature heating device is disposed in the liquid charging container, the liquid charging container is communicated with a second circulating pump, a circulating pipeline is communicated between the pressure device container and the liquid charging container, and the second circulating pump drives the fluid to form a closed circulation among the liquid charging container, the liquid inlet pipe, the pressure device container and the circulating pipeline.

7. The device for testing the burst pressure of the guide pipe under the static condition according to any one of claims 1 to 4, wherein a constant temperature water bath kettle is arranged inside the constant temperature water bath tank, a digital display temperature controller, a warming switch and a first circulating pump switch are arranged outside the constant temperature water bath tank, the digital display temperature controller and the warming switch are respectively connected with the constant temperature water bath kettle, and the first circulating pump switch is connected with the first circulating pump.

8. The apparatus for testing the burst pressure of a guide pipe under a static condition as claimed in claim 7, wherein the main body is provided with a driving box at one end thereof provided with the driving device, the driving device is positioned in the driving box, and the operation panel is positioned outside the driving box; the front end of the driving box protrudes out of the main body to form a first protruding part, the front end of the constant-temperature water bath box protrudes out of the main body to form a second protruding part, and the first protruding part and the second protruding part are symmetrically arranged; the protective sleeve joint, the conduit joint, the water inlet pipe joint and the second water return pipe joint are all arranged on the side face of the second bulge part opposite to the first bulge part.

9. The device of claim 8, wherein the body has a protective covering disposed on an outer side thereof, the protective covering being disposed between the first and second protrusions, the protective covering including a cross plate and a vertical plate, one side of the cross plate being hinged to a top edge of the body, the other side of the cross plate being fixedly connected to the vertical plate, the cross plate and the vertical plate corresponding to edges of the first and second protrusions.