JP6092715B2 - Plunger pump and pump device using the same - Google Patents

Description

  The present invention relates to a plunger pump for conveying a fluid such as a medicine and a pump device using the plunger pump.

  Conventionally, a plunger pump that conveys a fluid such as a medicine has been used.

  Patent Document 1 describes a plunger pump (quantitative discharge device 1) including a cylinder (container 2) and a plunger (plunger 8) disposed in the cylinder so as to be able to reciprocate. This cylinder has a first through hole into which a plunger is inserted, and a second through hole (discharge port 3) connected to the first through hole through which fluid enters and exits.

  In this plunger pump, by moving the plunger in a direction away from the second through hole, fluid is sucked into the first through hole from the outside through the second through hole, and the plunger is moved in the direction toward the second through hole. As a result, fluid is discharged from the first through hole to the outside through the second through hole. In this way, fluid can be conveyed using the plunger pump.

  When the plunger pump is reciprocated in the cylinder when the plunger pump is used, stress is easily applied to the end portion of the cylinder on the second through hole side. If the cylinder is damaged due to this stress, the amount of fluid conveyed by the plunger pump becomes non-uniform, and the reliability of the plunger pump is likely to decrease.

JP-A-9-159505

  The present invention provides a plunger pump and a pump device using the plunger pump that meet the demand for improving reliability.

A plunger pump according to an aspect of the present invention includes a cylinder and a plunger disposed in the cylinder so as to be capable of reciprocating, and the cylinder includes a first through hole into which the plunger is inserted. Or a first member made of metal and a second member made of ceramics or metal connected to the first member, the second member having a second through hole connected to the first through hole and allowing fluid to enter and exit, and the first member 1 member and a resin member interposed between the second member , the second member has a cylindrical convex portion protruding toward the first member, the resin member is the first member It is interposed between the outer peripheral surface of one member and the inner peripheral surface of the convex portion .

  The pump apparatus in one form of this invention is equipped with the plunger pump mentioned above and the drive part which reciprocates the said plunger of this plunger pump.

According to the plunger pump of one aspect of the present invention, the cylinder is formed by connecting the first member and the second member, and the resin member 8 is interposed between the first member and the second member. Thus, the stress applied to the second member located at the end of the cylinder on the second through hole side can be relaxed. Therefore, damage to the cylinder can be suppressed, so that the amount of fluid conveyed by the plunger pump can be made more uniform, and as a result, a highly reliable plunger pump can be obtained.

  According to the pump device in one embodiment of the present invention, since the above-described plunger pump is provided, a highly reliable pump device can be obtained.

(A) is sectional drawing along the longitudinal direction of the plunger pump in 1st Embodiment of this invention, (b) is along the longitudinal direction of the cylinder used for the plunger pump shown to Fig.1 (a). FIG. It is an enlarged view of the connection location of the 1st member of a cylinder shown in Drawing 1 (b), and the 2nd member. (A) is sectional drawing along the longitudinal direction of the plunger pump in 2nd Embodiment of this invention, (b) is along the longitudinal direction of the cylinder used for the plunger pump shown to Fig.3 (a). FIG. It is an enlarged view of the connection location of the 1st member of a cylinder shown in Drawing 3 (b), and the 2nd member.

<First Embodiment>
Below, the plunger pump in 1st Embodiment of this invention is demonstrated in detail with reference to drawings.

  The plunger pump 1 shown in FIG. 1 (a) is used for a pump device for transporting a fluid such as a medicine, and in particular for feeding the medicine to an object. The pump device includes a plunger pump 1 and a drive unit (not shown) that reciprocates a plunger 3 (to be described later) of the plunger pump 1 (reciprocating direction D).

  The plunger pump 1 conveys the fluid by sucking the fluid and discharging the sucked fluid. The plunger pump 1 includes a cylinder 2 and a plunger 3 disposed in the cylinder 2 so as to be able to reciprocate.

  As shown in FIGS. 1B and 2, the cylinder 2 is connected to the cylindrical first member 5 having the first through-hole 4 in which the plunger 3 is inserted, and the first through-hole 4 and fluid. And a second member 7 connected to the first member 5, and a resin member 8 interposed between the first member 5 and the second member 7.

  The first member 5 has a first through hole 4 in which a fluid sucked from the outside accumulates. The first member 5 is made of ceramics such as alumina or metal such as stainless steel, and it is preferable to use ceramics. As a result, by improving the wear resistance of the first member 5, it is possible to suppress fluid contamination due to wear of the first member 5 due to sliding with the plunger 3. The first member 5 is, for example, a cylindrical shape, and the first through hole 4 is, for example, a columnar shape.

The second member 7 has a second through hole 6 through which fluid enters and exits between the outside and the first through hole 4. The second member 7 is made of a ceramic such as alumina or a metal such as stainless steel, and it is desirable to use ceramic among them. As a result, by improving the wear resistance of the first member 5, fluid contamination due to wear of the second member 7 due to collision with the plunger 3 can be suppressed. The second member 7 is preferably made of the same material as the first member 5. As a result, the wear resistance of the second member 7 can be improved similarly to the first member 5. Further, the connection strength between the first member 5 and the second member 7 can be increased.

  The second member 7 has a funnel shape, for example. In this case, the second through hole 6 is interposed between the first portion 9 having a cylindrical shape whose diameter is smaller than that of the first through hole 4, and the first through hole 4 and the second through hole 6. A tapered second portion 10 whose width decreases from the first through hole 4 toward the second through hole 6 is provided.

  The resin member 8 is interposed between the first member 5 and the second member 7, and in the present embodiment, the first member 5 and the second member 7 are bonded together. The resin member 8 is made of a resin such as an epoxy resin. The thickness of the resin member 8 is, for example, 20 μm or more and 100 μm or less.

  The plunger 3 adjusts the pressure in the first through hole 4 by reciprocating in the first through hole 4 while sliding with the inner peripheral surface of the cylinder 2. The plunger 3 is made of, for example, ceramics such as zirconia or metal such as stainless steel, and among these, it is desirable to use ceramics. As a result, the cylinder 2 and the plunger 3 can be easily slipped, and the efficiency of fluid transfer can be increased. Further, by improving the wear resistance of the plunger 3, contamination of the fluid due to the wear of the plunger 3 can be suppressed. The plunger 3 has a shape corresponding to the shape inside the cylinder 2, that is, a shape corresponding to the first through hole 4 and the second through hole 6. As a result, since the outer peripheral surface of the plunger 3 slides with the inner peripheral surface of the cylinder 2 when reciprocating in the cylinder 2, the pressure in the first through hole 4 can be adjusted.

  For example, the plunger pump 1 operates as follows.

  First, the external fluid and the second through hole 6 are connected. At this time, the second through hole 6 may be directly connected to an external fluid, or the second through hole 6 may be connected to an external fluid via another member. Next, the plunger 3 inserted into the first through-hole 4 is moved away from the second through-hole 6 to reduce the pressure in the first through-hole 4 and the second through-hole 6 from the outside. The fluid is sucked into the first through hole 4 via the. Next, after this plunger pump 1 is moved to a desired location, the pressure in the first through hole 4 is increased by moving the plunger 3 in the direction toward the second through hole 6, and the first penetration Fluid is discharged from the hole 4 through the second through hole 6 to the outside.

  As described above, the plunger pump 1 can convey the fluid to a desired place.

  By the way, when the plunger 3 is reciprocated in the cylinder 2 when the plunger pump 1 is used, stress is easily applied to the end of the cylinder 2 on the second through hole 6 side.

  On the other hand, in this embodiment, as shown in FIGS. 1 and 2, the cylinder 2 has a first member 5 made of cylindrical ceramics or metal having a first through hole 4 into which the plunger 3 is inserted, A second member 7 made of ceramics or metal, connected to the first member 5, connected to the first through-hole 4 and having a second through-hole 6 through which fluid enters and exits, and the first member 5 and the second member 7. And a resin member 8 interposed therebetween.

As a result, the cylinder 2 is configured by connecting the first member 5 and the second member 7, and the resin member 8 is interposed between the first member 5 and the second member 7. The resin member 8 that is easily elastically deformed can relieve the stress applied to the second member 7 located at the end of the cylinder 2 on the second through-hole 6 side. Therefore,
Since damage to the cylinder 2 can be suppressed, the amount of fluid conveyed by the plunger pump 1 can be made more uniform, and as a result, the plunger pump 1 having excellent reliability can be obtained.

  In the present embodiment, the resin member 8 is interposed between the end surface of the first member 5 and the end surface of the second member 7. That is, the resin member 8 is interposed between the end surface located at the end of the first member 5 on the second member 7 side and the end surface located at the end of the second member 7 on the first member 5 side. In this case, the stress applied to the second member 7 is transmitted to the resin member 8 as a tensile stress. Since the resin member 8 has higher strength against tensile stress than shear stress, the resin member 8 can be prevented from being broken. Therefore, the relaxation of the stress applied to the second member 7 by the resin member 8 can be maintained. In the present embodiment, the end surface of the first member 5 and the end surface of the second member 7 are orthogonal to the longitudinal direction (X direction) of the cylinder 2.

  Further, the resin member 8 bonds the end surface of the first member 5 and the end surface of the second member 7. As a result, the adhesion of the first member 5 and the second member 7 can be maintained by suppressing the destruction of the resin member 8 as described above.

  In the present embodiment, the first member 5 has a cylindrical first convex portion 11 protruding toward the second member 7, and the second member 7 is a cylindrical shape protruding toward the first member 5. It has the 2nd convex part 12, and the 1st convex part 11 is fitted with the 2nd convex part 12 inside the 2nd convex part 12. FIG. As a result, the positioning accuracy of the first member 5 and the second member 7 can be increased by the first protruding portion 11 and the second protruding portion 12, and in particular, the positioning accuracy of the second through hole 6 can be increased. Note that, in the first member 5, a portion forming the main part of the first member 5 to which the first convex portion 11 is connected is referred to as a first main body 13. Further, in the second member 7, a part that forms a main part of the second member 7 to which the second convex portion 12 is connected is referred to as a second main body 14.

  The resin member 8 is interposed between the outer peripheral surface of the first convex portion 11 and the inner peripheral surface of the second convex portion 12. As a result, the stress applied to the second member 7 can be further relaxed by the resin member 8 interposed between the outer peripheral surface of the first convex portion 11 and the inner peripheral surface of the second convex portion 12. Further, by appropriately adjusting the lengths of the first and second convex portions 11 and 12 along the longitudinal direction of the cylinder 2, the stress relaxation function by the resin member 8 can be appropriately adjusted. The outer peripheral surface of the first convex portion 11 forms part of the outer peripheral surface of the first member 5 together with the outer peripheral surface of the first main body 13, and the inner peripheral surface of the second convex portion 12 is the second main body 14. A part of the inner peripheral surface of the second member 7 is formed together with the inner peripheral surface. In the present embodiment, the outer peripheral surface of the first convex portion 11 and the inner peripheral surface of the second convex portion 12 are along the longitudinal direction of the cylinder 2.

  Furthermore, the length along the longitudinal direction of the cylinder 2 on the outer peripheral surface of the first convex portion 11 is larger than the width of the end surface of the first member 5 (YZ plane direction). As a result, since the area where the resin member 8 is interposed between the first member 5 and the second member 7 can be increased, the stress applied to the second member 7 can be further relaxed.

  The resin member 8 is interposed between both the end surface of the first member 5 and the end surface of the second member 7 and between the outer peripheral surface of the first convex portion 11 and the inner peripheral surface of the second convex portion 12. ing. As a result, since the area where the resin member 8 is interposed between the first member 5 and the second member 7 can be increased, the stress applied to the second member 7 can be further relaxed.

In the present embodiment, the first member 5 includes an inner end surface of the first convex portion 11 formed from the top surface of the first convex portion 11 and an outer end surface of the first convex portion 11 located outside the first convex portion 11. And have. Further, the second member 7 has an outer end surface of the second convex portion 12 formed from the top surface of the second convex portion 12 and an inner end surface of the second convex portion 12 located inside the second convex portion 12. . In addition, the resin member 8 is interposed between the outer end face of the first protrusion 11 and the outer end face of the second protrusion 12. As a result, the stress applied to the second member 7 can be relieved by the resin member 8 interposed between the outer end face of the first protrusion 11 and the outer end face of the second protrusion 12. Further, since the outer end surface of the first convex portion 11 is separated from the first through hole 4 with the outer peripheral surface of the first convex portion 11 and the inner end surface of the first convex portion 11 interposed therebetween, the resin member 8 has the first convex portion. Protruding the resin member 8 into the first through hole 4 can be suppressed by being interposed between the outer end surface of the portion 11 and the outer end surface of the second convex portion 12. Therefore, inhibition of the reciprocating motion of the plunger 3 due to this protrusion can be suppressed.

  Further, the resin member 8 is interposed from the outer peripheral surface of the first convex portion 11 to the outer peripheral surface 5 of the first main body 13 between the outer end surface of the first convex portion 11 and the outer end surface of the second convex portion 12. ing. As a result, since the area where the resin member 8 is interposed between the first member 5 and the second member 7 can be increased, the stress applied to the second member 7 can be further relaxed.

  The resin member 8 is interposed between the inner end surface of the first convex portion 11 and the inner end surface of the second convex portion 12 while being separated from the first through hole 4. As a result, the stress applied to the second member 7 can be relieved by the resin member 8 interposed between the inner end surface of the first convex portion 11 and the inner end surface of the second convex portion 12. Further, since the resin member 8 is separated from the first through hole 4, the protrusion of the resin member 8 into the first through hole 4 can be suppressed. Therefore, inhibition of the reciprocating motion of the plunger 3 due to this protrusion can be suppressed. Note that a space 15 is formed between the first through hole 4 and the resin member 8 away from the first through hole 4 between the inner end surface of the first convex portion 11 and the inner end surface of the second convex portion 12. ing.

  Next, the manufacturing method of the plunger pump 1 of this embodiment mentioned above is demonstrated.

  (1) The 1st member 5, the 2nd member 7, and the plunger 3 are produced.

  In the case of using the first member 5, the second member 7 and the plunger 3 made of ceramics, the ceramic powder is formed by using various forming methods, cut and processed, and then fired to perform a desired grinding process. The first member 5, the second member 7, and the plunger 3 having a shape can be manufactured.

  When the first member 5, the second member 7 and the plunger 3 made of metal are used, the first member 5, the second member 7 and the plunger 3 having a desired shape are produced by performing lathe processing or the like on the metal. be able to.

  (2) The first member 5 and the second member 7 are connected via the resin member 8 to produce the cylinder 2.

  First, the uncured resin member 8 is applied to desired regions of the end portion of the first member 5 and the end portion of the second member 7. Next, after the end of the first member 5 and the end of the second member 7 are connected, the resin member 8 is cured, thereby bonding the first member 5 and the second member 7 with the resin member 8. The resin member 8 is interposed between the first member 5 and the second member 7. As a result, the cylinder 2 can be manufactured.

  As described above, the plunger pump 1 of the present embodiment shown in FIG. 1A can be manufactured.

Second Embodiment
Next, a plunger pump according to a second embodiment of the present invention will be described in detail with reference to the drawings. The description of the same configuration as that of the first embodiment described above is omitted.

  The plunger pump 1 of the present embodiment is different from the plunger pump 1 of the first embodiment in the configuration of the first member 5 and the second member 7. In the plunger pump 1 of the present embodiment, as shown in FIGS. 3 and 4, the first member 5 does not have the first convex portion 11, but the second member 7 protrudes toward the first member 5. The cylindrical second convex portion 12 is provided. The resin member 8 is interposed between the outer peripheral surface of the first member 5 and the inner peripheral surface of the second convex portion 12.

  As a result, the stress applied to the second member 7 can be further relaxed by the resin member 8 interposed between the outer peripheral surface of the first member 5 and the inner peripheral surface of the second convex portion 12. Moreover, the stress relaxation function by the resin member 8 can be appropriately adjusted by appropriately adjusting the length of the second convex portion 12 along the longitudinal direction of the cylinder 2.

  Furthermore, the length along the longitudinal direction of the cylinder 2 on the inner peripheral surface of the second convex portion 12 is larger than the width of the end surface of the first member 5. As a result, since the area where the resin member 8 is interposed between the first member 5 and the second member 7 can be increased, the stress applied to the second member 7 can be further relaxed.

  The resin member 8 is interposed between both the end surface of the first member 5 and the end surface of the second member 7 and between the outer peripheral surface of the first convex portion 11 and the inner peripheral surface of the second convex portion 12. ing. As a result, since the area where the resin member 8 is interposed between the first member 5 and the second member 7 can be increased, the stress applied to the second member 7 can be further relaxed.

  Further, screws are formed on the outer peripheral surface of the first member 5 and the inner peripheral surface of the second convex portion 12, and the first member 5 and the second member 7 are fastened. As a result, since the first member 5 and the second member 7 can be connected by fastening in addition to the adhesion by the resin member 8, the connection strength between the first member 5 and the second member 7 is increased, and the cylinder 2 is damaged. Can be suppressed. In addition, the outer peripheral surface of the 1st member 5 comprises the external thread, and the internal peripheral surface of the 2nd convex part 12 comprises the internal thread.

  The plunger pump 1 of the present embodiment is different from the plunger pump 1 of the first embodiment in the configuration of the resin member 8. In the plunger pump 1 of the present embodiment, as shown in FIGS. 3 and 4, the first resin member 16 interposed between the outer peripheral surface of the first member 5 and the inner peripheral surface of the second convex portion 12, The second resin member 17 is disposed between the end surface of the first member 5 and the inner end surface positioned on the inner side of the second convex portion 12 of the second member 7 and partly disposed in the first through hole 4. And have.

  As a result, as described above, the stress applied to the second member 7 can be relaxed by the first resin member 16. Furthermore, since the second resin member 17 is disposed between the end face of the first member 5 and the inner end face of the second member 7, the stress applied to the second member 7 can be further relaxed. In addition, since the second resin member 17 is interposed between the second member 7 and the plunger 3, the stress applied from the plunger 3 to the second member 7 can be relaxed. A part of the second resin member 17 disposed in the first through hole 4 has a shape corresponding to the end of the plunger 3.

  The first resin member 16 is interposed between the end surface of the second resin member 17 on the first member 5 side and the end surface of the first member 5. As a result, the stress applied to the second member 7 by the first resin member 16 can be further relaxed. Furthermore, since the 1st resin member 16 adhere | attaches the 2nd resin member 17 and the 1st member 5, the adhesive strength of the 2nd resin member 17 and the 1st member 5 can be raised, and the failure | damage of the cylinder 2 can be suppressed.

  The first resin member 16 has the same configuration as the resin member 8 of the first embodiment described above.

  The 2nd resin member 17 consists of resin, such as a fluororesin, for example, and it is desirable to use a fluororesin especially. As a result, the wear and damage of the second resin member 17 due to the collision with the plunger 3 can be suppressed, and the contamination of the fluid can be suppressed. In the present embodiment, a part of the second resin member 17 enters the second through hole 6, and the second resin member 17 penetrates along the longitudinal direction of the cylinder 2 and is the first. A third through hole 18 connected to the through hole 4 is provided.

  Next, the manufacturing method of the plunger pump 1 of this embodiment mentioned above is demonstrated.

  (1) The first member 5, the second member 7, the plunger 3, and the second resin member 17 are produced.

  The first member 5, the second member 7, and the plunger 3 having a desired shape are produced by the same method as in the first embodiment. Moreover, the 2nd resin member 17 of a desired shape is produced by shape | molding resin using various shaping | molding methods.

  (2) The first member 5 and the second member 7 are connected via the first resin member 16 and the second resin member 17 to produce the cylinder 2.

  First, the second resin member 17 is fitted to the second member 7. Next, uncured first resin member 16 is applied to desired regions of the end of first member 5 and the end of second member. Next, the male screw formed on the outer peripheral surface of the first member 5 and the inner screw formed on the inner peripheral surface of the second convex portion 12 are tightened with the screw. Next, the first resin member 16 is cured to bond the first member 5 and the second member 7 with the first resin member 16 while the first resin member 16 is interposed between the first member 5 and the second member 7. 16 and the second resin member 17 are interposed. As a result, the cylinder 2 can be manufactured.

  As described above, the plunger pump 1 according to this embodiment shown in FIG. 3A can be manufactured.

  The present invention is not limited to the embodiments described above, and various modifications, improvements, combinations, and the like can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the configuration in which the second member 7 includes the second protrusion 12 has been described as an example .

  Moreover, in embodiment mentioned above, although the resin member 8 demonstrated as an example the structure interposed between the outer peripheral surface of the 1st member 5, and the inner peripheral surface of the 2nd member 7, the resin member 8 is 1st. It suffices to be interposed at least at a part between the member 5 and the second member 7, and does not have to be interposed between the outer peripheral surface of the first member 5 and the inner peripheral surface of the second member 7.

  Moreover, in embodiment mentioned above, although the structure which the outer peripheral surface of the 1st member 5 and the internal peripheral surface of the 2nd member 7 connected was demonstrated to the example, the internal peripheral surface of the 1st member 5 and the 2nd member 7 were demonstrated. The outer peripheral surfaces may be connected.

DESCRIPTION OF SYMBOLS 1 Plunger pump 2 Cylinder 3 Plunger 4 1st through-hole 5 1st member 6 2nd through-hole 7 2nd member 8 Resin member 9 1st part 10 2nd part 11 1st convex part 12 2nd convex part 13 1st main body 14 Second body 15 Space between resin member 8 and first through hole 4 16 First resin member 17 Second resin member 18 Third through hole

Claims (7)

A cylinder and a plunger arranged in the cylinder so as to be capable of reciprocating;
The cylinder is
A first member made of cylindrical ceramics or metal having a first through-hole into which the plunger is inserted;
A second member made of ceramic or metal, connected to the first member, connected to the first through-hole and having a second through-hole through which fluid enters and exits;
A resin member interposed between the first member and the second member ;
The second member has a cylindrical convex portion protruding toward the first member,
The plunger pump , wherein the resin member is interposed between an outer peripheral surface of the first member and an inner peripheral surface of the convex portion . The plunger pump according to claim 1 , wherein
The convex part of the second member is a second convex part,
The first member has a cylindrical first convex portion protruding toward the second member and fitted with the second convex portion inside the second convex portion,
The plunger pump, wherein the resin member is interposed between an outer peripheral surface of the first convex portion and an inner peripheral surface of the second convex portion. The plunger pump according to claim 2 ,
The first member has the inner end face of the first projecting portion consisting of a top surface of the first convex portion, and said outer end surface of the first convex portion located outside the first projection,
The second member has the outer end face of the second projection comprising a top surface of the second convex portion, and said inner end face of the second projecting portion located inside the second convex portion,
The plunger pump, wherein the resin member is interposed between an outer end surface of the first convex portion and an outer end surface of the second convex portion. The plunger pump according to claim 2 ,
The first member has the inner end face of the first projecting portion consisting of a top surface of the first convex portion, and said outer end surface of the first convex portion located outside the first projection,
The second member has the outer end face of the second projection comprising a top surface of the second convex portion, and said inner end face of the second projecting portion located inside the second convex portion,
The plunger pump, wherein the resin member is interposed between an inner end surface of the first convex portion and an inner end surface of the second convex portion while being separated from the first through hole. The plunger pump according to claim 1 , wherein
A plunger pump, wherein a screw is formed on an outer peripheral surface of the first member and an inner peripheral surface of the convex portion. The plunger pump according to claim 1 , wherein
The resin member includes a first resin member interposed between an outer peripheral surface of the first member and an inner peripheral surface of the convex portion, and an inner side of the end surface of the first member and the convex portion of the second member. A plunger pump comprising: a second resin member disposed between the end faces positioned and partially disposed in the first through hole. A plunger pump as claimed in any one of claims 1 to 6, a pump apparatus characterized by comprising a driving unit to reciprocate the plunger of the plunger pump.

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