JP2006017123A - Peristaltic pump including support member and counter member working together with tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide further improvement of a peristaltic pump including a counter member and a support member gripping tube on which a pump acts therebetween. <P>SOLUTION: The peristaltic pump 1 includes force sensors 53, 57 detecting force acting on a part retaining tube 6 between the support member 19 and the counter member 24 and a process unit including a means determining whether a predetermined condition indicating that the tube 6 is correctly positioned between the support member 19 and the counter member 24 is satisfied or not based on signal value sent from the force sensors 53, 57. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention generally relates to a peristaltic pump, and more particularly, to a peristaltic pump including a support member and a counter member that hold a tube on which the pump is to operate.

  Peristaltic pumps, particularly as used in the medical field, are pumps that incorporate a roller in the rotor that moves liquid along the tube by gradually pressing an elastic tube in the transverse direction.

  Therefore, this type of pump is used to circulate the liquid in the tube by acting only on the tube without coming into contact with the liquid, and any application that needs to keep the fluid in a closed space For example, in applications that avoid contamination of fluids acting in a sterilizing environment. In general, peristaltic pumps are designed to operate in an environment where sterility is paramount, so that not only does the fluid circulation and the function of preventing fluid contamination by the environment meet, but the pump itself does not pollute the environment. Must be a thing. Accordingly, the various components of the peristaltic pump should be easily cleaned by ensuring that a complete seal is ensured and, at the same time, removable.

  The peristaltic pump typically includes a rotor, and a peripheral position of the rotor includes a roller and a movable jaw. The movable jaw moves in a direction in which the movable jaw moves away from the rotor, and the movable jaw and the rotor are moved. An open position where an elastically deformable tube on which a peristaltic pump should act is arranged, and the movable jaw moves in the direction of the rotor so that the tube is between the curved bearing surface of the movable jaw and at least one roller of the rotor. And a closed position to be gripped.

  Peristaltic pumps of the above type are known in the art, the movable jaw includes a protrusion formed by a support member, and a counter member is disposed on the pump body. When the movable jaw is in the open position, the support member moves away from the counter member, and when the movable jaw is in the closed position, the support member moves toward the counter member. Thus, when the tube is fitted to the peristaltic pump, the tube is separated from the support member and the counter member. It is gripped between the members. This gripping action generally has the function of holding the tube accordingly while the peristaltic pump is operating.

  Currently available peristaltic pumps generally allow visual inspection that the tube is in the correct position between the rotor and the movable jaw when the movable jaw is in the closed position. Similarly, it can be visually or automatically monitored that fluid is correctly circulating in the tube upstream and / or downstream of the peristaltic pump.

  It is to provide a further improvement of the above type of peristaltic pump.

According to the present invention, a peristaltic pump including a rotor incorporating a roller and a movable jaw provided with a support member,
The movable jaw is separated from the rotor and the support member, and is then separated from the counter member fixed to the peristaltic pump. As a result, a tube on which the peristaltic pump is to be operated is fitted between the movable jaw and the rotor. Open position, the movable jaw approaches the rotor and moves the bearing member towards the counter member, so that the tube is gripped between the curved bearing surface of the movable jaw and at least one roller of the rotor A peristaltic pump is provided that takes a closed position.

On the other hand, in the peristaltic pump of the present invention,
A sensor for detecting a force exerted between the support member and the counter member;
A process processing unit further comprising means for determining from the signal sent from this sensor whether a pre-determined condition indicating that the tube is in the correct position between the bearing member and the counter member is met. included.

Therefore, peristaltic pumps of the type described above always have access to information regarding the force exercised by the tube fitted in the peristaltic pump. The force exerted by the tube represents a complex elastic behavior of the tube, the liquid carried by the tube, and various measurements or monitoring parameters, but can be monitored as follows.
First, a sensor provides information regarding the presence or absence of a force exerted between the bearing member and the counter member.

This allows the process unit to access information indicating that the operation error has occurred because the tube is in the proper position, or vice versa, because the tube was not positioned between the support member and the counter member.
For best results it may be necessary to integrate the force sensor into the counter member.
In this case, the counter member includes a first assembly including the following, that is, a base portion having a fixing means for a peristaltic pump, a curved portion having one end rigidly attached to the base portion, and a contact member at the other end. A first assembly may be included that includes a test body and a strain gauge attached to the curved portion of the test body.

The counter member may also include a second assembly that is identical to and independent of the first assembly so as to be able to perform individual measurements associated with passing two double-passage tubes.
In a preferred embodiment of the invention, the process processing unit includes a memory storing a signal-pressure coefficient, and circulates in the tube by processing the signal value supplied from the force sensor according to the signal-pressure coefficient. Measure the fluid pressure value.

  This allows the force sensor to provide information related to the pressure of the fluid circulating in the tube. The process unit then uses the fluid pressure sensor to access the conversion factor for the measured force. Therefore, according to this type of peristaltic pump, the pressure of the fluid circulating in the tube can be displayed instantaneously.

  The following features to enhance the measurement, i.e., the process processing unit is a module for ensuring the creep of the tube, and the force sensor periodically measures the signal value supplied by this force sensor. A module for dynamically calibrating as a function of the signal value at the lowest value, a process processing unit may include a module for filtering out vibrations and pulsations of the peristaltic pump, A motorized closure device for closing the movable jaw underneath, the closure device providing a first speed or approach speed and a second speed or closure speed slower than the approach speed, contact It can be provided separately that the member can have a flat bearing surface adapted to contact the tube, and that the contact member can be a rigid member attached to the test barrel. It may be.

  In addition, the peristaltic pump can be realized separately from each other, that is, the process processing unit can cause the rotational speed of the rotor to follow the display value supplied by the force sensor, the process processing unit May have additional features based on features including allowing the peristaltic pump to stop when the force exercised between the bearing member and the counter member exceeds a predetermined threshold.

FIG. 1 shows a peristaltic pump 1 of the above type in one application example.
In this embodiment, the peristaltic pump 1 includes accessories such as a bottle rack 2 and a flow drawer 3. This form is used to pump the liquid stored in the bottle 4 to the two containers 5 through a tube having one end connected to the bottle 4 and the other end connected to the container 5.
In this embodiment, the tube 6 includes two separate upper and lower passages which are connected to each other by a longitudinal web 7 which is sealed to each other and can be easily cut.

The peristaltic pump 1 includes a pump body 8 having a display 9 and a control key 10 disposed on the top thereof.
The peristaltic pump 1 also includes a pump head 11 (FIG. 3) covered with a protective cap 12 of FIG.
FIG. 2 shows a perspective view seen from the bottom side with the protective cap 12 removed from the peristaltic pump 1. The protective cap 12 includes an enclosure 13 in the form of a cover that covers the movable elements of the pump head 11 and prevents the user from touching these movable elements. The enclosure 13 includes a straight groove 14 having a sufficient width for sliding the tube 6 therein.

  A movable jaw 15 is fixed to the inner wall of the enclosure 13 with three screws 16. The movable jaw 15 has a crescent shape as a whole, and the inner wall of the curved portion corresponding to the string forms an arcuate curved bearing surface 17. Each side of the curved bearing surface 17 includes a tooth 18 and a bearing member 19 that are adapted to cooperate with the tube 6 in the same manner as the curved bearing surface 17.

The movable jaw 15 further includes a hole 20 (see FIG. 1) that penetrates the wall of the enclosure 13.
A round hole 21 communicating with the oval hole 22 is also formed in the movable jaw 15. In FIG. 13, an oblong hole 22 is shown and includes a shoulder 22 'positioned substantially half the thickness of the wall portion of the movable jaw 15 as is apparent from the figure.

FIG. 3 shows the pump head 11 with the protective cap 12 removed. The pump head 11 has a plate shape, and the plate member is inserted into the counter member 24, the stop pin 25, and the hole 20 of the movable jaw 15 so that the movable jaw 15 can rotate. The shaft 23 is attached in a fixed state.
The pump head 11 also receives a rotor 26 in which a roller is incorporated and rotatably mounted, and a plate 27 from which an eccentric finger 28 protrudes.

FIG. 4 shows the rotor 26 incorporating the roller in a state removed from the peristaltic pump 1. The rotor 26 includes two flanges 29, and between these flanges, three cylindrical rollers 30 and two centering rollers 31 are rotatably mounted, and the cylindrical roller 30 follows the contour of the flange 29. And are equally spaced 120 ° from each other.
In FIG. 4, the flange 29 shown on the upper side includes a flat portion 32.

FIG. 14 shows the arrangement of the cylindrical roller 30, the centering roller 31, and the flat portion 32.
FIG. 5 shows the pump head shown in FIG. 3 with the rotor 26 removed. FIG. 5 shows a drive shaft 33 that rotationally drives the rotor 26 to satisfy the main functions of the peristaltic pump 1.

FIG. 6 shows a perspective view of the peristaltic pump 1 as seen from the side, and a portion where the tube 6 and the protective cap 12 cooperate is indicated by a Roman numeral VII.
FIG. 7 is an enlarged view of the portion indicated by the Roman numeral VII in FIG. 6 and shows the portion of the linear groove 14 where the tube 6 engages. This portion of the straight groove 14 is bounded by an arcuate bottom 35 and two opposing lateral walls 36. Each lateral wall 36 includes a holding boss 37 disposed in opposition.

The straight groove 14 part shown in FIG. 7 receives the tube 6 when the tube 6 is pushed into this part, and then this tube 6 is in relation to the longitudinal axis along the straight groove 14, in other words parallel to the straight groove. The positioning member is configured so as to be slidable.
When the tube 6 is pushed into the portion shown in FIG. 7 of the linear groove 14 (FIG. 9) and the assembly state shown in FIG. 7 is obtained, the tube 6 first slides downward along the lateral wall 36 and below the tube 6. The passage is in contact with the holding boss 37. The holding boss 37 creates a hard point that must be exceeded in order to push the tube 6 completely. If the user continues to push the tube beyond this hard point, the passage below the tube will be elastically deformed and then positioned against the bottom 35. The web 7 of the tube 6 is positioned between the two holding bosses 37, and the tube 6 is held in the direction of the portion of the linear groove 14 shown in FIG.

Even in a state in which the passage below the tube 6 is held in the housing by the holding boss 37, there is still a gap between the tube 6 and the positioning member. Therefore, as described above with reference to FIG. Sliding is possible.
The tube 6 is removed by elastically deforming its lower passage and passing the hard point in the same manner as described above.

FIG. 8 shows a cross-sectional view of the tube 6 in the arrangement state described above.
FIG. 11 shows a perspective view of the pump head 11 in the configuration of FIG.
FIG. 12 shows the pump head 11 with the movable jaw 15 fitted. In this FIG. 12, the movable jaw is shown separated from the cover 12 in order to show the cooperation with each component attached to the pump head 11.

FIG. 13 is a cross-sectional view of FIG.
The plate 27 is fixed to a drive shaft 38 that is attached to the support and rotates with respect to the pump head 11. The drive shaft 38 is fixed to a gear 39 that meshes with a worm gear 40 that is rotationally driven by a motor (not shown).

14 to 16 are plan views showing the positions of the movable jaw of the assembly shown in FIG. 12 as determined by the eccentric finger 28, that is, as determined by the angular position of the plate 27.
In FIG. 14, the eccentric finger 28 is at a position where the movable jaw 15 can be fitted to the pump head 11.

In FIG. 15, the movable jaw 15 is in the same position as in FIG. 14, but the eccentric finger 28 is in a position to lock the movable jaw 15 so that it is not pulled out of the pump head 11.
In FIG. 16, the movable jaw is shown closed by an eccentric finger 28.

Each position of the portion shown in FIGS. 14 to 16 is usually covered with a protective cap 12 that covers and fits the movable jaw 15, and is not visible from the outside during normal use of the peristaltic pump 1.
17 to 19 show the counter member 24 attached to the pump head 11.

  Referring to FIG. 19, a counter member 24 is shown having a shape that follows the contours of the upper test barrel 41, the lower test barrel 42, and the upper and lower test barrels. It includes two flanges 43 that connect each test barrel 41, 42 to each other.

FIG. 18 shows the shape of the flange 43 that forms the lateral wall of the counter member 24. Each flange 43 is rigidly attached to the upper test barrel 41 and the lower test barrel 42 by positioning pins 44 and fixing screws 45, respectively.
FIG. 17 shows the counter member viewed from the bottom, and also shows the surface of the lower test barrel 42 fixed to the pump head 11. A cable orifice 46 is provided between the two tapped holes 47 tapped on each of the bosses 48 on this surface.

The counter member 24 further includes an upper contact member 49 rigidly attached to the upper test barrel portion 41 and a lower contact member 50 rigidly attached to the lower test barrel portion 42.
When the upper test barrel 41 and the lower test barrel 42 are fixed to the respective flanges 43 by the positioning pins 44 and the fixing screws 45 and a force is applied to the upper contact member 49 and the lower contact member 50, the upper test barrel 41 and The lower test barrel 42 can be deformed.

  20 to 22 show the situation of the counter member similar to that of FIGS. 17 to 19, and the counter member 24 has an upper test body 41 and a lower contact member 50 fitted with a flange 43 and an upper contact member 49. And a resilient seal 43 that fills the gap between the lower test body 42 and the lower test body 42. The elasticity of the resilient seal 43 provides a sealing effect and at the same time allows relative movement of each test barrel and each flange 43. The stiffness of the material of the resilient seal 51 should be negligible when compared to that of each test barrel and each flange. Each test barrel 41, 42 may be formed from, for example, high strength martensitic stainless steel consistent with French Standards Association Z40 CNV 14 and tempered / annealed to HRC hardness 45, while each flange 43 and contact The members 49, 50 can be made from ordinary stainless steel, in which case the resilient seal 51 can be made from silicone. In general, the gaps and orifices between the test body portions 41 and 42, the contact members 49 and 50, and the flanges 43 can be completely sealed by filling them with this type of seal.

FIG. 23 is a partial cross-sectional view of the counter member 24 along the longitudinal direction showing the shapes of the upper test body 41 and the lower test body 42.
Each of the upper test body 41 and the lower test body 42 has a base portion 52, and a curved portion 53 is extended from each base portion 52, and corresponding contact members 49, 50 are located at end portions of the curved portion. A dovetail mortise 54 is provided in which the dovetail tenon 55 is engaged. Each base portion 52 includes a transverse hole 56 through which the pin 44 and the screw 45 are inserted, and an orifice 56 ′ for fixing a rear wall (not shown).

  Each of the upper test barrel 41 and the lower test barrel 42 has a strain gauge 57 fixed to the inner wall of the curved portion 53. The strain gauge 57 measures the deformation of the curved portion 53 at the mounting portion. The curved portion 53 causes such deformation when the counter member 24 is fixed to the pump head 11 by inserting a screw into the tap hole 47 and then either the upper test barrel 41 or the lower test barrel 42 is pressed. obtain.

Since the upper test drum portion 41 and the lower test drum portion 42 are connected only at the base portion 52 via the flanges 43, the deformation of the curved portion 53 of one test drum portion is the curve of the other test drum portion. It should be noted that the deformation of the body portion 53 is irrelevant.
The strain gauge can be connected to a Wheatstone bridge, for example, in a manner well known in the mechanical engineering field.

A cable (not shown) passing through the orifice 46 connects each strain gauge 57 to the control circuit of the peristaltic pump 1.
FIG. 24 shows a peristaltic pump such as a process processing unit 58 connected to the counter member 24, a motor for driving the rotor 26, a motor for driving the eccentric finger 28, an input device such as the key 10, and an output device such as the display 9. FIG. 3 is a diagram representing a variety of one component.

The process processing unit 58 includes a compensation module 59 for compensating for creep movement of the tube 6, a control module 60 for controlling the closing of the movable jaw 15, and filtering for filtering the pulsation of the peristaltic pump 1. Module 61.
The function of the process processing unit whose operation will be described in the future can be provided by an appropriate electronic circuit or an appropriate programmed data process processing device.

The peristaltic pump 1 described here operates in the manner described below.
When the peristaltic pump 1 is started, the movable jaw 15 is in the position shown in FIG. 15 corresponding to the position of the protective cap 12 shown in FIGS. 9 and 10, and the rotor 26 is also in the position shown in FIG. The portion 32 is arranged so that a straight passage is formed between the rotor 26 and the movable jaw 15, and the positioning member of the protective cap 12 is aligned with the formed straight passage.

  First, the tube 6 is fitted into the peristaltic pump 1. For this purpose, as shown in FIG. 9, the user holds the tube 6 with both hands and inserts it into the linear groove 14, but since the holding boss 37 exists, it is formed at the end position of each linear groove 14. In order to reach an appropriate position in the positioning member, it is necessary to push the tube 6 over the hard point as described above as shown in FIG.

Referring to FIG. 10, the user then moves the tube 6 in order to adapt the tube length available on each side of the cover 12 as a correlator of the accessory (see FIG. 1) to which the tube 6 is connected. Slide in either of the horizontal directions.
If this operation is performed, the user need not be involved as far as positioning of the tube 6 in the peristaltic pump 1 is concerned.

  When the user starts the peristaltic pump 1 using the control key 10, the plate 27 is rotated through its drive system, whereby the movable jaw 15 is moved to the position shown in FIG. 16, and at this position, the movable jaw 15 Teeth 18 clamp the longitudinal web 7 of the tube 6 to the fixing pin 25.

When the movable jaw 15 reaches the position, the motor stalls, and the current consumption of the motor increases. When the current consumption peak value due to this current increase is detected, the motor is stopped.
When the movable jaw 15 is closed, the tube 6 is wound around the rotor 26 and simultaneously slides within the positioning member of the protective cap 12 as necessary.
In the tube 6, the upper and lower passages of the tube 6 are lightly gripped by the cooperation of the teeth 18 and the fixing pin 25, and the support member 19 and the counter member 24, thus the rotor 26. Finally held on each side.

  The movable jaw 15 is held in the closed position by an irreversible system including the gear 39 and the worm gear 40. The pitch and spiral angle of these components are well known in the field of mechanical engineering. When the worm gear 40 rotates, the gear 39 is driven to rotate. Selected not to.

  When the tube 6 is inserted as described above and the rotor 26 is rotated, the roller 30 moves and the fluid stored in the tube 6 starts to circulate.

  When the peristaltic pump 1 is operated, the movable jaw 15 is prevented from being detached from the position of FIG. 16, that is, the combination of the movable jaw and the protective cap by the eccentric finger 28 and the shoulder 22 ′ in the oblong hole 22 in the movable jaw 15. The user's safety is assured. The movable jaw 15 does not come off even when the peristaltic pump 1 operates although the position shown in FIG. 15, that is, the rotor 26 does not rotate.

On the other hand, when the peristaltic pump 1 is stopped, the eccentric finger 28 returns to the position shown in FIG. 14 and, for example, the movable jaw and the protective cap of the protective cap can be cleaned so that the components of the pump head 11 can be cleaned. Release the combination.
The peristaltic pump 1 further includes means for obtaining information about the tube 6 and the circulating fluid via the counter member 24 and operating with respect to the peristaltic pump 1 according to the obtained information.

  The counter member 24 is coupled to a process processing unit (FIG. 24) that stores the signal-pressure coefficient in memory. The process processing unit derives the pressure of the fluid circulating in the tube 6 from the signal-pressure coefficient and the strain gauge 57 (displays the deformation amount of the corresponding curved portion 53).

  With the tube 6 fitted and the pump head in the position shown in FIG. 16, the process processing unit first checks that the tube 6 is present and that the tube is correctly positioned. For this purpose, it is confirmed that the distance between the support member 19 and the counter member 24 when the movable jaw 15 is closed is less than the width dimension of the tube 6 (see FIG. 23). It is necessary to confirm the amount of deformation.

If the presence of the tube 6 is not detected, the peristaltic pump 1 is not driven and an error message is displayed.
When the tube is correctly positioned and the peristaltic pump is activated, the process processing unit 58 supplies the instantaneous pressure of the fluid in each passage above and below the tube 6 to the output device in a mutually independent manner.

  The signal-pressure coefficient is determined empirically during the calibration phase by incorporating a known tube into the peristaltic pump 1 and applying a known pressure to this tube. The signal-pressure coefficient can then be determined by reading the voltage value sent from the strain gauge 57 and determining the pressure value corresponding to this voltage value. The signal-pressure coefficient can be determined each time a new tube is used. The average value of the signal-pressure coefficient can be obtained by performing this test on a plurality of tubes and determining an effective average value for all the tubes from the test results.

The process processing unit 58 can use the measured pressure value of the fluid in the tube 6 for the secondary applications described below.
The process processing unit 58 includes a module 59 that compensates for creep movement of the tube 6, thus improving measurement reliability. For this purpose, the module 59 measures the voltage value sent from the strain gauge 57 at regular intervals, for example, every 20 milliseconds, and sets the lowest voltage value as a reference value for calculating the zero pressure. To perform a dynamic calibration over the next measurement.

  The process processing unit 58 adjusts the closing speed of the movable jaw 15 when the movable jaw 15 moves from the open position to the closed position, and presses the tube 6 between the support member 19 and the counter member 24. It also includes a module 60 for controlling the closing of the movable jaw 15. If the movable jaw 15 is closed too early, the elasticity of the tube 6 prevents the pressure measurement.

If the pressure measurement is so disturbed, the module 60 can slow down the closing speed of the movable jaw 15 (ie, reduce the speed of the motor of the eccentric finger 28).
The module 60 can initiate the closing of the movable jaw 15 at a high speed and then clamp the tube 6 at a low speed after the tube 6 approaches the counter member 24.

The process processing unit 58 further includes a module 61 for filtering the pulsation of the peristaltic pump 1. The operation of the rotor 26 acting on the tube 6 during the operation of the peristaltic pump 1 causes periodic disturbances to pressure measurements based on the rotational frequency of the rotor 26.
The module 61 applies electronic filtering, for example by low-pass RC filter means, which sets the cut-off frequency.

  In this embodiment, the rotational speed of the rotor 26 is 240 rpm, and the rotor includes three rollers corresponding to an angular frequency of 12 Hz. A cut-off frequency of 1.5 Hz is defined by an appropriate RC filter. This value gives good results.

The process processing unit 58 can also cause the rotational speed of the rotor 26 to follow the pressure measurement value of the fluid in the tube 6. For example, if the process processing unit 58 obtains information related to the maximum allowable pressure value in the tube 6, the rotational speed of the peristaltic pump can be increased to the maximum value, and the pressure in the tube 6 approaches the maximum allowable value. If so, it can be decelerated as necessary.
Similarly, if it is indicated that the fluid pressure value has changed above, the process processing unit 58 can detect an incorrect flow of fluid in the tube 6, for example, related to blockage.
Although the present invention has been described with reference to the embodiments, it should be understood that various modifications can be made within the present invention.

It is a perspective view of the peristaltic pump and accessories in the operation preparation state. It is a perspective view from the bottom part of the protective cap arrange | positioned at the upper part of the peristaltic pump of FIG. FIG. 3 is a plan view of the peristaltic pump of FIG. 1 with the protective cap of FIG. 2 removed. FIG. 4 is a perspective view of a rotor incorporating a roller, visible on top of the peristaltic pump of FIG. 3. FIG. 5 is a plan view similar to FIG. 3 with the rotor of FIG. 4 removed. It is a perspective view from a different direction from FIG. It is an expanded sectional view of the part shown by VII of FIG. It is sectional drawing which cut | disconnects the upper part of the peristaltic pump shown in FIG.1 and FIG.6 along a longitudinal direction, and illustrates the arrangement | positioning state of the tube inside a protective cap. FIG. 7 is a perspective view illustrating a situation where a tube is manually fitted in the peristaltic pump shown in FIGS. 1 and 6. FIG. 10 is a perspective view similar to FIG. 9 illustrating a situation in which the tube shown in FIG. 9 is adjusted in the lateral direction. It is a perspective view of the head part of the peristaltic pump shown in FIG. It is a perspective view similar to FIG. 11 which shows the movable jaw shown in FIG. It is sectional drawing which cut | disconnected the assembly shown in FIG. 12 along the plane which passes along the rotor incorporating a roller, and the cam which act | operates a movable jaw. FIG. 13 is a plan view of the head portion of the peristaltic pump shown in FIG. 12 showing the movable jaws at different positions. FIG. 13 is a plan view of the head portion of the peristaltic pump shown in FIG. 12 showing the movable jaws at different positions. FIG. 13 is a plan view of the head portion of the peristaltic pump shown in FIG. 12 showing the movable jaws at different positions. FIG. 13 is a bottom view of the counter member shown in FIG. 12, facing the support member of the movable jaw. FIG. 13 is a side view of the counter member shown in FIG. 12 facing the support member of the movable jaw. FIG. 13 is a front view of the counter member shown in FIG. 12 facing a support member of the movable jaw. FIG. 18 is a bottom view similar to FIG. 17 after the counter member has undergone a sealing process. FIG. 19 is a side view similar to FIG. 18 after the counter member has undergone a sealing process. FIG. 20 is a front view similar to FIG. 19 after the counter member has undergone a sealing process. It is the side view partly cut | disconnected along the longitudinal direction which shows the cooperation condition between the support member and a pipe of the counter member shown in FIG. It is a diagram showing the arrangement status of the force sensor and the process processing unit and the connection status with specific elements of the peristaltic pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Peristaltic pump 2 Bottle rack 3 Flow drawer 4 Bottle 5 Container 6 Tube 7 Longitudinal web 8 Pump trunk 9 Display 10 Control key 11 Pump head 12 Protection cap 13 Enclosure 14 Linear groove 15 Movable jaw 17 Curved bearing surface 18 Teeth 19 Bearing member 20 hole 21 round hole 22 oblong hole 22 'shoulder 23 shaft 24 counter member 25 stop pin 26 rotor 27 plate 28 eccentric finger 29 flange 30 cylindrical roller 31 roller for centering 32 flat portion 33 drive shaft 36 lateral wall 37 Holding boss 38 Drive shaft 39 Gear 40 Worm gear 41 Upper test barrel 42 Lower test barrel 43 Flange 44 Positioning pin 45 Fixing screw 46 Cable orifice 47 Tap hole 48 Bo 50 the lower contact member 51 resiliently seal 53 curved portion 54 dovetail mortise 55 dovetail tenon 56 transverse bore 56 'orifice 57 strain gauge 58 processes the processing unit 59 compensation module 60 the control module 61 filtering module

Claims (13)

A peristaltic pump (1) comprising a rotor (26) comprising a roller (30) and a movable jaw (15),
The movable jaw (15)
In the open position, the movable jaw moves away from the rotor (26) and then the bearing member (19) moves away from the fixed counter member (24) of the peristaltic pump (1) As a result, the tube (6) on which the peristaltic pump (1) should act can be fitted between the movable jaw (15) and the rotor (26) on one side, and the bearing member (19) and the counter member on the other side. (24) an open position that can be fitted between,
In the closed position, the movable jaw (15) moves in a direction approaching the rotor (26), and this movement moves the bearing member (19) in the direction of the counter member (24), with the result that the tube (6 ) Is gripped between the curved bearing surface (17) of the movable jaw (15) and at least one roller (30) of the rotor (26) on one side, and on the other side the bearing member (19) and the counter A closed position gripped between the member (24) and
The peristaltic pump (1)
Force sensors (53, 57) exercised between the support member (19) and the counter member (24);
Preliminary indication that the position of the tube (6) between the support member (19) and the counter member (24) is correct from the signal sent from the force sensor (53, 57) to the process processing unit (58). Means for determining that the decision condition is satisfied;
Further including a peristaltic pump. The peristaltic pump according to claim 1, wherein the force sensor (53, 57) is integrated with the counter member (24). Counter member (24)
A base part (52) having means (47) for fixing the base part to the peristaltic pump (1) as a base part (52);
A test barrel (53) having one end rigidly attached to the base (52) and the other end including a curved portion including a contact member (50);
A strain gauge (57) attached to the curved portion of the test barrel (53);
The peristaltic pump of claim 2, comprising a first assembly comprising: The peristaltic pump of claim 3, wherein the counter member (24) comprises a second assembly identical and separate from the first assembly. A process processing unit (58) including a memory storing a signal-pressure coefficient, wherein the process processing unit processes the value of the signal sent from the force sensor (53, 57) according to the signal-pressure coefficient; The peristaltic pump according to any one of claims 1 to 4, wherein the pressure of the fluid circulating in the tube (6) is obtained. The process processing unit (58) periodically measures the signal value sent from the force sensor (53, 57) in the module (59) for compensating the creep movement of the tube (6) and A peristaltic pump according to any of the preceding claims, comprising a module (59) adapted to dynamically calibrate the force sensor (53, 57) as a function of the minimum measurement. The peristaltic pump according to any of the preceding claims, wherein the process processing unit (58) comprises a module (61) for filtering the pulsations of the peristaltic pump (1). The peristaltic pump according to any one of claims 1 to 7, wherein the process processing unit (58) causes the rotational speed of the rotor (26) to follow the display value sent from the force sensor (53, 57). The process processing unit (58) stops the peristaltic pump (1) when the force exerted between the bearing member (19) and the counter member (24) exceeds a predetermined threshold. The peristaltic pump according to claim 1. 10. A peristaltic pump according to any of the preceding claims, comprising a motor driven closing device for closing the movable jaw (15) under variable speed. 11. The peristaltic pump of claim 10, wherein the closure device provides a first speed, i.e., an approach speed, and a second speed, i.e., a closing speed that is slower than the approach speed. The peristaltic pump according to claim 3 or 4, wherein the contact member (49, 50) has a flat bearing surface adapted to contact the tube (6). The peristaltic pump according to claim 3 or 4, wherein the contact member (49, 50) is a rigid member attached to the test body (53).

Images