JP6393551B2 - Diaphragm pump - Google Patents

Description

  The present invention is particularly suitable for application to a diaphragm pump having a pump chamber formed by a diaphragm.

  As a conventional diaphragm pump, a diaphragm to which a plurality of diaphragm portions forming a pump chamber are attached, a driving body that expands and contracts the pump chamber by vertically moving each diaphragm portion of the diaphragm, and each pump chamber A suction valve having a crescent shape that partitions the suction side and the discharge side and includes a partition plate provided with a suction hole and a discharge hole corresponding to each pump chamber, and the diaphragm blocks the flow from the pump chamber to the suction hole There is one in which a body and a discharge valve body that blocks the flow from the discharge hole to the pump chamber are integrally formed (for example, see Patent Document 1).

JP 2012-21482 A

  As shown in FIG. 8, in the diaphragm 150 of the conventional diaphragm pump described above, the upper portion of each diaphragm portion 151 is opened, and a part of the opening portion 151a is opened from the opening end portion 151b of the opening portion 151a. A facing crescent-shaped suction valve element 150 a that faces the projection 150 is provided in the horizontal direction so as to be integrated with the diaphragm 150.

  In a state where each diaphragm portion 151 of the diaphragm 150 is in close contact with the partition plate 160 provided with the suction hole 161, when the pump chamber 170 is expanded to a negative pressure state, the suction valve body 150a opens downward. Air is sucked into the pump chamber 170 through the suction hole 161. On the other hand, when the pump chamber 170 contracts, the air pressure in the pump chamber 170 increases, and the suction valve body 150a is brought into close contact with the lower surface 160a of the valve housing 160, thereby ensuring the sealing performance of the pump chamber 170.

  By the way, the suction valve element 150a of the diaphragm 150 improves the state in which the sealing performance with respect to the suction hole 161 of the valve housing 160 is deteriorated due to the slack of the valve, so that the lower surface 160a of the valve housing 160 faces the diaphragm 150 side. It was formed to swell in a spherical shape.

  As a result, sagging occurs in the suction valve element 150a of the diaphragm 150, and the lower surface 160a of the valve housing 160 rises in a spherical shape even when the tip side is lowered downward. It becomes easy to make close contact with the lower surface 160a, and the sealing performance with respect to the suction hole 161 of the valve housing 160 can be ensured.

  However, in this case, even if the pump chamber 170 expands to a negative pressure state, the suction valve element 150a may remain adhered to the lower surface 160a of the valve housing 160. Had the problem of not working as a valve.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a diaphragm pump that guarantees the operation as a valve while improving the sealing performance with respect to the suction hole of the pump chamber.

In order to achieve this object, the invention according to claim 1 includes a pump chamber (35), a suction hole (32) for sucking fluid into the pump chamber (35), and the pump chamber (35). A partition plate (30) having a discharge hole (62) for discharging fluid to the outside, and an opening (17b) for discharging the fluid from the pump chamber (35) to the discharge hole (62) of the partition plate (30). ) And a diaphragm portion (17) having a diaphragm portion (17) having a suction valve element (17a) for restricting the backflow of fluid in the pump chamber (35) to the suction hole (32), and the diaphragm ( 15) a diaphragm holder (10) for holding, and a discharge valve body (60) attached to the partition plate (30) for restricting the backflow of fluid from the discharge hole (62) into the pump chamber (35). ) In Muponpu (1), the diaphragm portion and the opening portion (17b) and said diaphragm side engaging recess to the peripheral portion of the suction valve body (17a) (17e) or diaphragm-side engaging protrusion on the lower surface (17) ( 17g), the holder side engaging convex part (10a) or the diaphragm side engaging convex part (10u) engaged with the diaphragm side engaging concave part (17e) on the upper surface (10u) of the diaphragm holder (10) 17g) is provided with a holder-side engagement concave portion (10b ), an outer diameter (T1) of the holder-side engagement convex portion (10a), and an inner diameter (T2) of the holder-side engagement concave portion (10b). Is formed larger than the inner diameter (t2) of the diaphragm side engaging convex part (17g) and the outer diameter (t1) of the diaphragm side engaging concave part (17e) .
The invention according to claim 2 includes a pump chamber (35), a suction hole (32) for sucking fluid into the pump chamber (35), and a discharge hole for discharging fluid in the pump chamber (35) to the outside. A partition plate (30) having (62), an opening (17b) for discharging fluid from the pump chamber (35) to the discharge hole (62) of the partition plate (30), and the pump chamber (35) A diaphragm (15) having a diaphragm portion (17) having a suction valve element (17a) for restricting a back flow of fluid in the suction hole (32), and a diaphragm holder (13) for holding the diaphragm (15) 10) and a diaphragm pump having a discharge valve element (60) attached to the partition plate (30) for restricting the backflow of fluid from the discharge hole (62) into the pump chamber (35) In 1) A diaphragm side engaging concave part (17f) or a diaphragm side engaging convex part (17d) is provided on the peripheral part of the opening (17b) and the suction valve element (17a) on the upper surface of the diaphragm part (17), The lower surface (30a) of the partition plate (30) is engaged with the partition plate side engagement convex portion (30d) engaged with the diaphragm side engagement concave portion (17f) or the diaphragm side engagement convex portion (17d). The partition plate side engagement recess (30c) is provided, the inner diameter (D1) of the partition plate side engagement recess (30c), and the outer diameter (D2) of the partition plate side engagement projection (30d), The inner diameter (d1) of the diaphragm side engaging convex part (17d) and the outer diameter (d2) of the diaphragm side engaging concave part (17f) are formed.

In the invention according to claim 3 , the lower surface (30a) of the partition plate (30) is formed in a horizontal plane.

  According to the first aspect of the present invention, the diaphragm side engaging concave portion (17e) or the diaphragm of the diaphragm portion (17) in the holder side engaging convex portion (10a) or the holder side engaging concave portion (10b) of the diaphragm holder (10). When the side engaging convex part (17g) is engaged, the diaphragm side engaging concave part (17e) or the entire peripheral part of the diaphragm side engaging convex part (17g) is pulled so as to expand outward, and the diaphragm Since the suction valve element (17a) of the part (17) is also pulled simultaneously, the slack of the suction valve element 17a is eliminated. As a result, the suction valve element (17a) is maintained in a horizontal state that is always parallel to the lower surface (30a) of the partition plate (30) as a default state. It does not remain attached to the lower surface 30a. Therefore, when the pump chamber (35) contracts, the suction valve element (17a) is brought into close contact with the lower surface (30a) of the partition plate (30) to ensure a sealing property, and then the pump chamber (35) is expanded. When the negative pressure state is reached, the suction valve element (17a) is opened downward from the lower surface (30a) of the partition plate (30), and the valve operation in the diaphragm section (17) is guaranteed.

According to the invention of claim 3 , since the suction valve element (17a) is maintained in a default state and always in a horizontal state parallel to the lower surface (30a) of the partition plate (30), the intake valve element ( 17a) does not remain attached to the lower surface (30a) of the partition plate (30). Thereby, it is not necessary to form the lower surface (30a) so as to be raised in a spherical shape as in the prior art, and the lower surface (30a) of the partition plate (30) can be formed in a horizontal plane.

It is sectional drawing which shows the structure of the diaphragm pump which concerns on the 1st Embodiment of this invention. It is an expanded sectional view which shows the structure of the diaphragm and partition plate which concern on 1st Embodiment, About a diaphragm part, it is the II sectional view taken on the line in FIG. It is a top view which shows the structure of the diaphragm part which concerns on 1st Embodiment. It is an expanded sectional view which shows the structure of the diaphragm which concerns on 2nd Embodiment, and a partition plate, and about a diaphragm part, it is the II-II sectional view taken on the line in FIG. It is a top view which shows the structure of the diaphragm part which concerns on 2nd Embodiment. It is an expanded sectional view showing composition of a diaphragm and a partition plate concerning a 3rd embodiment. It is an expanded sectional view showing the composition of the diaphragm and partition plate concerning a 4th embodiment. It is sectional drawing which shows the valve body for suction | inhalation of the conventional diaphragm.

  In the following, embodiments of the present invention will be described by dividing them into first to fourth embodiments.

<First Embodiment>
<Configuration of diaphragm pump>
As shown in FIGS. 1 to 3, the diaphragm pump 1 having three cylinders includes a motor 3 fixed to the outside of a bottom portion of a case 2 formed in a substantially bottomed cylindrical shape. The shaft 3a protrudes from the hole 2a of the case 2 into the case 2, and the crank table 4 is attached to the protruding end of the output shaft 3a.

  One end of the drive shaft 5 that is inclined with respect to the axial direction of the output shaft 3a is attached to a portion of the crank base 4 that is eccentric from the output shaft 3a of the motor 3, and the other end of the drive shaft 5 is The drive body 6 is fitted into a non-through hole 7a of the bearing portion 7 fixed integrally with the boss 6a of the drive body 6. That is, the drive body 6 is pivotally supported with respect to the drive shaft 5.

  The boss 6a of the driving body 6 has three driving elements 8 (only two driving elements 8 are shown) so as to be substantially orthogonal to the non-through hole 7a of the bearing portion 7 and downward at the same angle. It is formed in a slightly inclined state, and a diaphragm portion mounting hole 8 a is provided at the tip of each driver element 8.

  On the upper end of the case 2, there is placed a diaphragm holder 10 that is opened in the lower part and formed in a cup shape. The diaphragm holder 10 has three diaphragm portion holding holes 11 (two diaphragm portion holding holes) formed at equal intervals (120 degrees) in the circumferential direction to hold each diaphragm portion 17 of the diaphragm 15 to be described later. Only the holes 11 are shown).

  The diaphragm 15 is formed of a flexible material such as rubber, and is provided with three diaphragm portions 17 (only two diaphragm portions 17 are shown) provided at equal angular intervals in the circumferential direction and opened upward. The diaphragm portion 17 is integrally formed with a flange 27 that is formed in a substantially disc shape and is connected to the upper end portion of the diaphragm portion 17.

  A piston 19 having a substantially conical section is integrally formed on the lower surface of each diaphragm portion 17, and a locking projection 19b is integrally formed on the lower portion of the piston 19 via a narrow neck portion 19a. Has been. The diaphragm 15 is inserted into the diaphragm portion mounting hole 8a of each driver element 8 of the driving body 6 while elastically deforming the convex portion 19b of each diaphragm portion 17, so that the neck portion 19a becomes the diaphragm portion mounting hole 8a of the driver element 8. Attached to.

  Here, as shown in FIG. 2, the upper part of each diaphragm part 17 is opened, and a valve body for inhalation having a crescent shape that faces a part of the opening part 17b from a part of the opening end part 17c of the opening part 17b. 17a protrudes in the horizontal direction in a state of being integrated with the diaphragm portion 17.

  The suction valve element 17a is formed in a horizontal plane parallel to a lower surface 30a of a partition plate 30 described later, and functions as a sealing surface that closely contacts the lower surface 30a of the partition plate 30.

  A partition plate 30 is fixed to the upper surface of the flange 27 of the diaphragm 15. A columnar convex portion 30t is formed on the upper surface side of the central portion of the partition plate 30, the discharge valve body 60 is engaged with the convex portion 30t, and the periphery of the convex portion 30t. The partition wall 30b formed in an annular shape is integrally erected.

  Here, since the diaphragm 15 is sandwiched between the partition plate 30 and the diaphragm holder 10, three pump chambers 35 are formed between the partition plate 30 and each diaphragm portion 17 of the diaphragm 15.

  By the way, as shown in FIGS. 2 and 3, the diaphragm 15 is sandwiched between the opening 17 b of the diaphragm portion 17 and the upper surface 17 u on the peripheral edge side of the suction valve body 17 a between the partition plate 30 and the diaphragm holder 10. When this is done, an annular diaphragm-side engagement convex portion 17d that engages with the partition-plate-side engagement concave portion 30c of the partition plate 30 is formed.

  In the partition plate 30, three suction holes 32 (only two suction holes 32 are shown) communicating with each pump chamber 35 are formed at equal angular intervals (120 degrees) in the circumferential direction. Three discharge holes 62 (only two discharge holes 62 are shown) communicating with each pump chamber 35 are formed at equal intervals (120 degrees) in the circumferential direction. The three discharge holes 62 are disposed on the inner peripheral side of the three suction holes 32 and on the inner side of the partition wall 30b. The three suction holes 32 and the three discharge holes 62 are provided in each pump chamber 35. Corresponding arrangement.

  The suction hole 32 of the partition plate 30 is closed by the suction valve body 17a, and the suction valve body 17a and the lower surface 30a of the partition plate 30 allow air as a fluid to flow from the pump chamber 35 into the suction hole 32. The check valve to be regulated is configured.

  The discharge valve body 60 engaged with the convex portion 30t of the partition plate 30 is formed of a flexible material such as rubber, and a flat plate-like valve portion 60a is formed on the peripheral portion thereof. A raised portion 60b is provided integrally with the raised portion, and a recessed portion 60c that fits into the raised portion 30t is formed on the back side of the raised portion 60b. The valve portion 60 a of the discharge valve body 60 corresponds to the discharge hole 62 of the partition plate 30, closes the discharge hole 62 and restricts the flow of air from the discharge port 42 to the pump chamber 35. Constitutes a valve.

  Further, on the lower surface 30 a of the partition plate 30, the annular partition plate side engaged with the diaphragm side engagement convex portion 17 d is positioned substantially opposite to the annular diaphragm side engagement convex portion 17 d of the diaphragm portion 17. An engaging recess 30c is formed. Here, the inner diameter D1 of the partition plate side engaging recess 30c of the partition plate 30 is formed larger than the inner diameter d1 of the diaphragm side engaging convex portion 17d of the diaphragm portion 17. That is, the relationship of D1> d1 is satisfied.

  A lid 40 formed in a flat box shape having an opening at the bottom is fixed to the upper end portion of the partition plate 30. A cylindrical discharge cylinder portion 43 having a discharge port 42 communicating with the discharge hole 62 of the partition plate 30 through the discharge space 41 is erected at the center portion on the upper surface side of the lid 40. Further, a suction passage 40 a communicating with a suction space 52 described later is formed at the end on the upper surface side of the lid body 40.

  On the back surface side of the lid 40, a partition wall 40 b formed in an annular shape in plan view so as to surround the discharge cylinder portion 43 is integrally projected downward, and the partition wall 40 b and the partition plate 30 are separated from each other. When 30b is opposed and fixed, the discharge space 41 is formed. When the lid 40 is placed and fixed on the partition plate 30, a suction space 52 communicating with the suction hole 32 of the partition plate 30 is formed around the discharge space 41.

<Pump operation of diaphragm pump>
In the diaphragm pump 1 configured as described above, when the motor 3 is driven and the output shaft 3a is rotated, the crank base 4 also rotates integrally with the output shaft 3a, and the output shaft 3a remains in a state where the drive shaft 5 is inclined. , The ends of the three driving elements 8 of the driving body 6 reciprocate in the vertical direction in the figure.

  Accordingly, since the three diaphragm portions 17 are sequentially reciprocated in the vertical direction as the driver element 8 is reciprocated in the vertical direction, the three pump chambers 35 are sequentially expanded and contracted. When the pump chamber 35 is expanded, the pump chamber 35 is in a negative pressure state, and the suction valve body 17a of the diaphragm portion 17 is elastically deformed downward, and the suction hole 40a and the suction space 52 of the lid body 40 are sucked into the suction hole. Air is sucked into the pump chamber 35 through 32.

  On the other hand, when the pump chamber 35 contracts, the pressure in the air in the pump chamber 35 rises, so that the suction valve element 17a in the diaphragm portion 17 is brought into close contact with the lower surface 30a of the partition plate 30, and air is supplied from the pump chamber 35 to the suction hole 32. Is discharged from the discharge hole 62 to the atmosphere through the discharge space 41 and the discharge port 42 of the discharge cylinder portion 43.

  By the way, the inner diameter D1 of the partition plate side engaging recess 30c of the partition plate 30 is formed larger than the inner diameter d1 of the diaphragm side engaging convex portion 17d of the diaphragm portion 17 (D1> d1). When the diaphragm side engaging convex portion 17d of the diaphragm portion 17 is engaged with the plate side engaging concave portion 30c, the entire peripheral portion of the diaphragm side engaging convex portion 17d in the diaphragm portion 17 is shown in FIG. Is pulled outwardly as indicated by the arrow direction, and the suction valve element 17a of the diaphragm portion 17 is also pulled simultaneously. As a result, the slack of the suction valve element 17a is eliminated.

  As a result, the suction valve element 17 a of the diaphragm portion 17 is always maintained in a horizontal state parallel to the lower surface 30 a of the partition plate 30. Therefore, unlike the prior art, the lower surface 160a of the valve housing 160 does not need to be formed so as to rise spherically toward the diaphragm 150 (FIG. 8).

  Thus, since the suction valve element 17a of the diaphragm portion 17 is in a default state and always maintained in a horizontal state parallel to the lower surface 30a of the partition plate 30, the suction valve element 17a is maintained at the lower surface 30a of the partition plate 30. It will not remain stuck on. Thus, when the pump chamber 35 contracts, the suction valve element 17a is brought into close contact with the lower surface 30a of the partition plate 30 to ensure a sealing property, and when the pump chamber 35 expands to a negative pressure state, the partition plate The suction valve element 17a is opened downward from the lower surface 30a of the valve 30, so that the valve operation in the diaphragm portion 17 is guaranteed.

<Second Embodiment>
Next, the diaphragm pump according to the second embodiment will be described. Since the overall configuration and pump operation are substantially the same as those of the first embodiment, here, for the sake of convenience, the first embodiment is different from the first embodiment. Only the configuration and operation of the diaphragm portion 17 and the diaphragm holder 10 of the different diaphragm 15 will be described.

  As shown in FIG. 4, corresponding parts to FIG. 2 are denoted by the same reference numerals, the lower surface 17 s of the diaphragm portion 17 is held on the holder side of the diaphragm holder 10 when sandwiched between the partition plate 30 and the diaphragm holder 10. An annular diaphragm-side engagement recess 17e that is engaged with the engagement protrusion 10a is formed on the periphery of the suction valve element 17a and the opening 17b (not shown).

  On the other hand, the upper surface 10u of the diaphragm holder 10 is engaged with the engaging recess 17e at the end of the diaphragm portion 17 near the diaphragm portion holding hole 11 that is substantially opposed to the annular dow or the diaphragm side engaging recess 17e. An annular holder-side engagement convex portion 10a is formed. Here, the outer diameter T1 of the holder side engaging convex portion 10a of the diaphragm holder 10 is formed larger than the outer diameter t1 of the diaphragm side engaging concave portion 17e of the diaphragm portion 17. That is, the relationship of T1> t1 is satisfied.

  As described above, the outer diameter T1 of the holder-side engaging convex portion 10a of the diaphragm holder 10 is formed larger than the outer diameter t1 of the diaphragm-side engaging concave portion 17e of the diaphragm portion 17 (T1> t1). When the diaphragm-side engagement concave portion 17e of the diaphragm portion 17 is engaged with the holder-side engagement convex portion 10a of the holder 10, as shown in FIG. 5, the periphery of the diaphragm-side engagement concave portion 17e in the diaphragm portion 17 The entire portion is pulled so as to expand outwardly as indicated by the arrow direction, and the suction valve element 17a of the diaphragm portion 17 is also pulled simultaneously. As a result, the slack of the suction valve element 17a is eliminated.

  As a result, the suction valve element 17 a of the diaphragm portion 17 is always maintained in a horizontal state parallel to the lower surface 30 a of the partition plate 30. Therefore, unlike the prior art, the lower surface 160a of the valve housing 160 does not need to be formed so as to rise spherically toward the diaphragm 150 (FIG. 8).

  Thus, since the suction valve element 17a of the diaphragm portion 17 is in a default state and always maintained in a horizontal state parallel to the lower surface 30a of the partition plate 30, the suction valve element 17a is maintained at the lower surface 30a of the partition plate 30. It will not remain stuck on. Thus, when the pump chamber 35 contracts, the suction valve element 17a is brought into close contact with the lower surface 30a of the partition plate 30 to ensure a sealing property, and when the pump chamber 35 expands to a negative pressure state, the partition plate The suction valve element 17a is opened downward from the lower surface 30a of the valve 30, so that the valve operation in the diaphragm portion 17 is guaranteed.

<Third Embodiment>
Subsequently, the diaphragm pump according to the third embodiment will be described. Since the overall configuration and pump operation are substantially the same as those of the first embodiment, here, for convenience, the first embodiment is different from the first embodiment. Only the configuration and operation of the diaphragm portion 17 and the partition plate 30 of the different diaphragm 15 will be described.

  As shown in FIG. 6 where parts corresponding to those in FIG. 2 are denoted by the same reference numerals, a partition plate 30 and a diaphragm are provided on the suction valve element 17a of the diaphragm portion 17 and the upper surface 17u on the peripheral edge side of the opening portion 17b. An annular diaphragm-side engagement concave portion 17f that engages with the partition plate-side engagement convex portion 30d of the partition plate 30 when sandwiched between the holder 10 and the holder 10 is formed.

  On the other hand, on the lower surface 30a of the partition plate 30, an annular partition plate side engagement that is engaged with the diaphragm side engagement recess portion 17f is provided at a position substantially opposite to the annular diaphragm side engagement recess portion 17f of the diaphragm portion 17. A mating protrusion 30d is formed. Here, the outer diameter D2 of the partition plate side engaging convex portion 30d of the partition plate 30 is formed larger than the outer diameter d2 of the diaphragm side engaging concave portion 17f of the diaphragm portion 17. That is, the relationship of D2> d2 is satisfied.

  Thus, the outer diameter D2 of the partition plate side engaging convex portion 30d of the partition plate 30 is formed larger than the outer diameter d2 of the diaphragm side engaging concave portion 17f of the diaphragm portion 17 (D2> d2). When the diaphragm side engaging concave portion 17f of the diaphragm portion 17 is engaged with the partition plate side engaging convex portion 30d of the partition plate 30, the entire peripheral portion of the diaphragm side engaging concave portion 17f of the diaphragm portion 17 is outward. And the suction valve element 17a of the diaphragm portion 17 is also pulled at the same time. As a result, the slack of the suction valve element 17a is eliminated.

  As a result, the suction valve element 17 a of the diaphragm portion 17 is always maintained in a horizontal state parallel to the lower surface 30 a of the partition plate 30. Therefore, unlike the prior art, the lower surface 160a of the valve housing 160 does not need to be formed so as to rise spherically toward the diaphragm 150 (FIG. 8).

  Thus, since the suction valve element 17a of the diaphragm portion 17 is in a default state and always maintained in a horizontal state parallel to the lower surface 30a of the partition plate 30, the suction valve element 17a is maintained at the lower surface 30a of the partition plate 30. It will not remain stuck on. Thus, when the pump chamber 35 contracts, the suction valve element 17a is brought into close contact with the lower surface 30a of the partition plate 30 to ensure a sealing property, and when the pump chamber 35 expands to a negative pressure state, the partition plate The suction valve element 17a is opened downward from the lower surface 30a of the valve 30, so that the valve operation in the diaphragm portion 17 is guaranteed.

<Fourth embodiment>
Finally, the diaphragm pump according to the fourth embodiment will be described. Since the overall configuration and pump operation are almost the same as those of the first embodiment, here, for convenience, the first embodiment is different from the first embodiment. Only the configuration and operation of the diaphragm portion 17 and the diaphragm holder 10 of the different diaphragm 15 will be described.

  As shown in FIG. 7 where parts corresponding to those in FIG. 2 are given the same reference numerals, the lower surface 17 s of the diaphragm portion 17 has a holder side of the diaphragm holder 10 when sandwiched between the partition plate 30 and the diaphragm holder 10. An annular diaphragm-side engaging convex portion 17g that is engaged with the engaging concave portion 10b is formed.

  On the other hand, on the upper surface 10 u of the diaphragm holder 10, the annular holder side that is engaged with the diaphragm side engaging convex portion 17 g at a position substantially opposite to the annular diaphragm side engaging convex portion 17 g of the diaphragm portion 17. An engaging recess 10b is formed. Here, the inner diameter T2 of the holder-side engagement concave portion 10b of the diaphragm holder 10 is formed larger than the inner diameter t2 of the diaphragm-side engagement convex portion 17g of the diaphragm portion 17. That is, the relationship of T2> t2 is satisfied.

  Thus, the inner diameter T2 of the holder-side engagement concave portion 10b of the diaphragm holder 10 is formed larger than the inner diameter t2 of the diaphragm-side engagement convex portion 17g of the diaphragm portion 17 (T2> t2). When the diaphragm side engaging convex part 17g of the diaphragm part 17 is engaged with the holder side engaging concave part 10b, the entire peripheral part of the diaphragm side engaging convex part 17g in the diaphragm part 17 is expanded outward. Therefore, the suction valve element 17a of the diaphragm portion 17 is also pulled at the same time. As a result, the slack of the suction valve element 17a is eliminated.

  As a result, the suction valve element 17 a of the diaphragm portion 17 is always maintained in a horizontal state parallel to the lower surface 30 a of the partition plate 30. Therefore, unlike the prior art, the lower surface 160a of the valve housing 160 does not need to be formed so as to rise spherically toward the diaphragm 150 (FIG. 8).

  Thus, since the suction valve element 17a of the diaphragm portion 17 is in a default state and always maintained in a horizontal state parallel to the lower surface 30a of the partition plate 30, the suction valve element 17a is maintained at the lower surface 30a of the partition plate 30. It will not remain stuck on. Thus, when the pump chamber 35 contracts, the suction valve element 17a is brought into close contact with the lower surface 30a of the partition plate 30 to ensure a sealing property, and when the pump chamber 35 expands to a negative pressure state, the partition plate The suction valve element 17a is opened downward from the lower surface 30a of the valve 30, so that the valve operation in the diaphragm portion 17 is guaranteed.

<Other embodiments>
In the above-described embodiment, the case where the crescent-shaped intake valve body 20 is used has been described. However, the present invention is not limited to this, and the opening is formed from a part of the opening end 17c of the opening 17b. As long as it is a shape that faces a part of the portion 17b, various other shapes such as a semicircular shape may be used.

  Furthermore, in the above-described embodiment, the case where the present invention is applied to the three-cylinder diaphragm pump 1 provided with three pump chambers 35 has been described. However, the present invention is not limited to this, and one cylinder or two cylinders are also provided. However, it may be applied to a diaphragm pump having four or more cylinders.

  DESCRIPTION OF SYMBOLS 1 ... Diaphragm pump, 2 ... Case, 3 ... Motor, 4 ... Crank base, 5 ... Drive shaft, 6 ... Drive body, 7 ... Bearing part, 8 ... Driver, 10 ... Diaphragm holder, 10a ... Holder side engagement convexity , 10b... Holder side engaging recess, 11. Diaphragm holding hole, 15. Diaphragm, 17. Diaphragm, 17 a. Inlet valve body, 17 b. Opening, 17 d and 17 g. , 17f ... Diaphragm side engagement recess, 19 ... Piston, 27 ... Flange, 30 ... Partition plate, 30c ... Partition plate side engagement recess, 30d ... Partition plate side engagement projection, 32 ... Suction hole, 35 ... Pump chamber , 40 ... Lid, 41 ... Discharge space, 42 ... Discharge port, 43 ... Discharge cylinder, 60 ... Discharge valve element, 62 ... Discharge hole.

Claims (3)

A pump chamber, a partition plate having a suction hole for sucking fluid into the pump chamber and a discharge hole for discharging the fluid in the pump chamber to the outside, and discharging the fluid from the pump chamber to the discharge hole of the partition plate A diaphragm having a diaphragm portion having a suction valve body that restricts a backflow of fluid in the pump chamber to the suction hole, a diaphragm holder holding the diaphragm, and the discharge hole into the pump chamber In a diaphragm pump comprising a discharge valve body attached to the partition plate that restricts the back flow of the fluid,
A diaphragm-side engagement concave portion or a diaphragm-side engagement convex portion is provided on a peripheral portion of the opening and the suction valve body on the lower surface of the diaphragm portion,
A holder side engagement convex part engaged with the diaphragm side engagement concave part or a holder side engagement concave part engaged with the diaphragm side engagement convex part is provided on the upper surface of the diaphragm holder ,
The outer diameter of the holder side engaging convex part and the inner diameter of the holder side engaging concave part are formed larger than the inner diameter of the diaphragm side engaging convex part and the outer diameter of the diaphragm side engaging concave part. Diaphragm pump. A pump chamber, a partition plate having a suction hole for sucking fluid into the pump chamber and a discharge hole for discharging the fluid in the pump chamber to the outside, and discharging the fluid from the pump chamber to the discharge hole of the partition plate A diaphragm having a diaphragm portion having a suction valve body that restricts a backflow of fluid in the pump chamber to the suction hole, a diaphragm holder holding the diaphragm, and the discharge hole into the pump chamber In a diaphragm pump comprising a discharge valve body attached to the partition plate that restricts the back flow of the fluid,
A diaphragm side engaging concave portion or a diaphragm side engaging convex portion is provided on a peripheral edge portion of the opening and the suction valve body on the upper surface of the diaphragm portion,
A partition plate side engagement convex portion engaged with the diaphragm side engagement concave portion or a partition plate side engagement concave portion engaged with the diaphragm side engagement convex portion is provided on the lower surface of the partition plate,
The inner diameter of the partition plate side engaging concave portion and the outer diameter of the partition plate side engaging convex portion are formed larger than the inner diameter of the diaphragm side engaging convex portion and the outer diameter of the diaphragm side engaging concave portion.
Diaphragm pump characterized by that. The diaphragm pump according to claim 1, wherein a lower surface of the partition plate is formed in a horizontal plane.

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