JP4469973B2 - Plunger pump seal structure - Google Patents

Description

  The present invention relates to a seal structure for a plunger type pump.

  JP-A-2001-254686 is described as an example of the prior art. The pump described in this publication includes a mounting block having a seal fitting recess on a joint end surface, and a pump head joined to the joint end surface of the mounting block. Since the inner wall surface of the fitting recess of the mounting block is gradually narrowed in the back direction, when the plunger seal is fitted into the recess and the adjusting screw is tightened, the plunger and the plan The frictional force with the plunger seal inserted through the jar can be adjusted.

  The above seal structure is effective for a reciprocating working rod, but it is necessary to accurately process the outer peripheral shape of the seal and the inner wall surface of the recess for fitting (particularly suitable for the inner diameter of the recess). In order to achieve this, it is necessary to accurately form the seal size and thickness). Moreover, it does not adapt to the pump provided with the rotation inner valve which guides the plunger as described in Patent Document 2 and Patent Document 3. The reason is that the inner valve having a predetermined volume for fluid is rotatably provided in the valve box and has a through hole for opening and closing the opening (suction hole and discharge hole) of the valve box. Because.

In the seal structure of a plunger type pump, it is common to fit a seal in a recess as described in Patent Document 1. For example, a circumferential groove is formed on the circumferential wall surface of the inner valve, and an O-ring is fitted into the circumferential groove. However, the structure in which the seal is fitted in the recess generally cannot adjust the pressing force by suppressing the seal with the inner peripheral wall of the valve box, so that there is a risk of leakage if the seal is worn. is there. Therefore, the accuracy of the seal size, thickness, circumferential groove depth, inner wall surface, and the like is required. The basic configuration of the plunger type pump is described in Patent Documents 2 and 3.
JP 2001-254686 A Japanese Patent No. 3314186 Japanese Patent No. 3334110

  A first object of the present invention is to simplify the seal structure and to be easy to install. The second object is that fluid leakage can be easily prevented by adjusting the tightening screw even when the seal of the rotating inner valve is worn. The third object is that there is no need to accurately form and process the seal and the mounting portion of the seal (the mounting surface of the inner valve or the pump head may be rough). The fourth object is that assembly and disassembly of the valve body and the inner valve are simple.

The plunger-type pump seal structure of the present invention is a plunger-type pump seal structure in which an outer cylinder of a valve body and a pump head are detachably coupled via a fastening means, and a suction hole formed in the pump head and each selectively provided rotatably a cylindrical inner valve having a communicable opening the valve body relative to the discharge hole, the wall surface of the axial direction of the inner valve, communicating with the opening of the inside valve In addition, a seal having a through hole that can selectively communicate with the suction hole and the discharge hole is fixedly attached. When the tightening means is tightened, the seal reciprocates the inner valve via the inner wall surface of the pump head. It is characterized by being pressed in the axial direction of the moving plunger.

Further, the seal structure of the plunger type pump of the present invention is a plunger type pump seal structure in which the outer cylinder of the valve body and the pump head are detachably coupled via a tightening means, and is formed in the pump head. A cylindrical inner valve having a long hole-like opening that can selectively communicate with the long hole-like suction hole and the discharge hole is rotatably provided in the valve body, and is provided on a wall surface on the axial direction side of the pump head. , communicates with the opening in said valve, fitted with a seal having a pair of selectively communicatively long hole-shaped through hole in the suction hole and the discharge hole in the circumferential direction in a fixed manner, the seal, the clamping means When tightened, it is pressed in the axial direction of the plunger that reciprocates the inner valve through the wall surface of the inner valve.

  In the above configuration, the valve body 1 includes the outer cylinder 2 and the left and right pump heads 3 integrally coupled to the vertical support portions 22 and 22 having the left and right flange functions of the outer cylinder via the fastening means 5 respectively. 4, and the seal has a center hole 81 in which the peripheral edge portion is formed in a circular shape, and the guide protrusions (65, 65A) of the inner valve 6 are inserted into the center portion. It has one or two arc-shaped through holes that are concentric circles and a plurality of mounting portions.

(1) The seal structure is simple and the mounting is easy. The seal structure is as described in claim 2.
(2) Even if the seal of the rotating inner valve is worn, fluid leakage can be easily prevented by adjusting the tightening screw.
(3) It is not necessary to accurately form the shape and thickness of the seal or to precisely process the inner cylinder or the seal mounting portion of the pump head.
(4) By adjusting the tightening of the tightening means, the frictional force between the seal of the rotating inner valve and the inner wall surface of the pump head can be adjusted to an optimum value.
(5) Since the assembly and disassembly of the valve body and the inner valve is simple, it is convenient for cleaning and washing.

  Hereinafter, the best mode (first embodiment) for carrying out the present invention shown in FIGS. 1 to 14 will be described.

  X is a plunger type pump, 1 is a valve body, 2 is an outer cylinder of the valve body, 3 is one pump head of the valve body, 4 is the other pump head of the valve body, and 5 is an outer cylinder and pump head of the valve body. Tightening means (for example, a plurality of tightening screws), 6 is an inner valve provided rotatably on the valve body, 7 is a plunger reciprocally provided on the inner valve, and 8 is an inner valve 6. A pair of left and right seals fixedly attached to the outer wall surface on the axial direction side, a first suction pipe for fluid attached to one pump head 3, and a fluid attached to the other pump head 4 The second suction pipe 11, 11 is a fluid first discharge pipe attached to one pump head 3, and 12 is a fluid second discharge pipe attached to the other pump head 4. Hereinafter, these basic components will be mainly described. Reference numeral 15 denotes a hat-shaped end cap which is fixed to the central portion of one pump head 3 via a plurality of fixing tools 16, and 17 denotes a fixing tool 18 at the central portion of the other pump head 4. It is a support plate which has the bearing function fixed via.

(1) Valve body 1
The valve body (valve box) 1 will be described with reference to FIGS. 1 and 2. The valve body 1 of the present embodiment includes an outer cylinder 2 having mounting flange portions at both ends, and a pair of left and right pump heads 3 fixed to the flange portion of the outer cylinder 2 via a plurality of fastening screws 5, respectively. It consists of four.

  Referring to FIG. 2, the valve body 1 is composed of three parts: an outer cylinder 2 at the center, one (left side) pump head 3, and the other (right side) pump head 4. 4 is detachably coupled (screwed) to the outer cylinder 2 via a flange portion and a plurality of fastening screws 5. Further, at least one of the left and right pump heads 3 and 4 of the present invention has a suction hole and a discharge hole.

(2) Outer cylinder 2
The outer cylinder 2 will be described with reference to FIGS. 3 and 4. Reference numeral 21 denotes an attachment base portion, and a vertical support portion 22 having a pair of left and right flange functions is connected to the upper surface near both ends of the attachment base portion 21. Reference numeral 23 denotes an outer cylinder portion that is connected to the opposing inner wall surfaces of the left and right vertical support portions 22 and 22. The outer cylinder portion 23 is orthogonal to the vertical support portions 22 and 22. The inner diameter of the outer cylinder portion 23 is appropriately set in consideration of the outer diameter of the inner valve 6. The left and right vertical support portions 22, 22 have circular openings 25, 25 having the same diameter that communicate with the horizontal guide holes 24 of the outer cylinder portion 23, respectively.
Reference numerals 26 and 26 denote annular outward (lateral) recesses formed in the peripheral portions of the openings 25 and 25 of the left and right vertical support portions 22 and 22, respectively. The inner diameters of the recesses 26, 26 are larger than the openings 25, 25, and the inner dimensions (depths) of the recesses 26, 26 are the same or different. In the present embodiment, the inner dimension of the right side recess 26 is slightly large in order to set an annular space 47 described later.

  Reference numerals 27 and 27 denote a plurality of (for example, eight) through holes formed in the flange portions of the left and right vertical support portions 22 and 22 with a required interval in the circumferential direction. These through holes 27, 27 are formed on concentric circles of the guide hole 24 or the circular opening 25.

(3) One pump head 3
The pump head 3 will be described with reference to FIGS. 2, 5, and 6. The pump head 3 has a C-shaped cross section, and a head fitting hole 31 is formed at the center. The head fitting hole 31 is fitted into a short cylindrical guide protrusion at the tip of the inner valve 6.

  Since the head fitting hole 31 of the present embodiment supports the distal end portion of the rotating inner valve 6, it exhibits a bearing function. The inner diameter of the head fitting hole 31 is the same as that of the end cap 15 that guides the tip of the inner valve 6. The end cap 15 is fixed to a vertical portion of the outer wall surface 3 a of the pump head 3 through the fixing tool 16.

  Reference numeral 32 denotes a first suction hole having a long hole shape (for example, an arc shape) formed in an upper central portion of the inclined portion of the pump head 3. FIG. 6 is an explanatory view seen from the inner wall surface 3 b side of the pump head 3. With reference to the center O of the head fitting hole 31 in FIG. 6, the length of the first suction hole 32 in the arc direction is approximately 90 degrees (semi-arc shape).

  On the other hand, 33 is a first discharge hole having a long hole shape (for example, a semicircular arc shape) formed in the lower center portion of the inclined portion of the pump head 3. The first discharge hole 33 is formed symmetrically with the first suction hole 32 (line symmetry) with respect to the center O of the fitting hole 31.

  Reference numeral 34 denotes a plurality (for example, eight) of female screws for the fastening screw 5 formed at the annular mounting end of the pump head 3 with a required interval. These female screws 34 are through-holes for the fastening screw 5 of the outer cylinder 2. Matches 27. Reference numeral 35 denotes a sealing fitting recess formed in a cup shape on the inner wall surface 3b of the pump head 3. This fitting recess 35 is fitted to the outer wall surface 8a of the trumpet seal 8 in this embodiment. It converges gradually from the end surface (the inner wall surface) 3b of the annular mounting end portion toward the fitting hole 31 so as to (fit). Therefore, the design of the fitting recess 35 of the pump head 3 can be arbitrarily changed corresponding to the shape of the one seal 8.

(4) The other pump head 4
The configuration of the other pump head 4 is substantially the same as the configuration of the one pump head 3. The pump head 4 will be described with reference to FIGS. As described above, reference numeral 10 denotes a second suction pipe for fluid. The second suction pipe 10 guides the fluid of the same or different supply source as the first suction pipe 9 to the inner valve 6 through the seal 8.

  When the supply sources (not shown) are the same, the first suction pipe 9 and the second suction pipe 10 are branched on one supply line (supply guide conduit). Reference numeral 12 denotes a second discharge pipe for fluid, and the second discharge pipe 12 joins the first discharge pipe 11 for fluid, for example, on one discharge line.

  4a is an outer wall surface of the pump head 4, 4b is an inner wall surface thereof, 41 is a head fitting hole, 42 is a second suction hole having a long hole shape, and 43 is a long hole at a position symmetrical to the second suction hole. It is a 2nd discharge hole of shape. Reference numeral 44 denotes a plurality of (for example, eight) female screws for the fastening screw 5 formed at the annular mounting end of the pump head 4 with a required interval, and these female screws 44 coincide with the through holes 27 of the outer cylinder 2. .

  45 is a fitting recess for sealing formed on the inner wall surface 4 b of the pump head 4 in a cup shape, and this fitting recess 45 fits to the outer wall surface 8 a of the other trumpet-shaped seal 8. From the vicinity of the annular mounting end, the head gradually converges toward the head fitting hole 41.

  By the way, the pump head 4 is slightly different from the configuration of one of the pump heads 3 in that an annular recess 46 having the same inner diameter as the annular recess 26 of the outer cylinder 2 is formed on the end surface 4b of the annular mounting end. Is different. As shown in FIG. 2, the coupling flange of the plunger 7 is inserted into an annular space 47 obtained by adding the inner dimension (depth) of the annular recess 46 of the pump head 4 and the inner dimension (depth) of the annular recess 26 of the outer cylinder 2. Part is housed.

(5) Tightening means As shown in FIG. 2, the fastening screws 5 are respectively inserted into the left and right through holes 27 of the outer cylinder 2 and screwed into the female screws 34 of the left and right pump heads 3, 4.

  The fastening screw 5 is a means for connecting a horizontally long valve body (valve box) 1 divided into a plurality of parts, and is interposed between the pump heads 3 and 4 and the outer wall surface of the inner valve 6 on the axial direction side. This is means for pressing the seals 8 and 8 to be pressed. Therefore, by adjusting the tightening of the tightening screw 5, the frictional force between the seals 8 and 8 of the rotary inner valve 6 and the inner wall surfaces of the pump heads 3 and 4 can be adjusted to an optimum value. Further, even if one or more seals of the rotating inner valve 6 are worn, the fluid leakage can be easily prevented by the tightening adjustment 5 of the tightening screw.

  The tightening means may be a ring clamp (known) having a thumbscrew. In this case, the right pump heads 3, 4 are tightened directly or indirectly via clamps. It is not an essential matter of the invention whether the fastening means 5 is a fastener or a tight clamp.

(6) Inner valve and plunger The cylindrical inner valve 6 is provided in the valve body 1 so that it can be rotated by the driving force of a driving source (manual, driving motor, etc.) not shown. The plunger 7 incorporated in the inner valve 6 is provided in the valve body 1 so as to reciprocate in the axial direction with the driving force of the second driving source that is the same as or different from the driving source. A plurality of gears that transmit the rotational motion of the drive source and a mechanism (such as a crank, a binion, and a rack) that convert the rotational motion into a reciprocating motion are arbitrarily adopted in design. Further, a bearing means for smoothly rotating the inner valve 6 is arbitrarily employed in design.

In this embodiment, the inner valve 6 corresponding to the plug has a long hole shape that can selectively communicate with the first suction hole 32 and the first discharge hole 33 that are formed in one of the pump heads 3. One of the cylindrical first valves 6a having the first opening 61 and the other having the inner end flange portion 63 joined to the main body flange portion 62 provided around the inner end portion of the first valve 6a. The actuated hook-like second valve 6b.

  In the present embodiment, like the first valve 6a, the second valve 6b has a length that can communicate with the long suction holes 42 and the second discharge holes 43 formed in the other pump head 4, respectively. A hole-like second opening 64 is provided. As described above, the inner valve 6 of the present embodiment is provided with the divided and combined first valve 6a and second valve 6b each having a single long hole-shaped opening 61.64 having the same shape and communicating.

  By the way, regarding the coupling mode of the first valve 6a and the second valve 6b, the second opening 64 of the actuated hook-shaped coupling valve 6b is positioned on the same horizontal line as the first opening 61 depending on the usage of the plunger type pump X. (The openings 61 and 64 are both upward) or the second opening 64 is positioned and coupled to the first opening 61 on the horizontal line (the opening 61 is the upper side while the second opening 64 is the lower side) To decide.

  In this embodiment, fluid is continuously applied to a plurality of suction rods 9, 10 and discharge rods 11, 12 that are opposed to each other on the basis of a piston 72 fixed to a portion of the plunger 7 near the tip of the rod 71. The latter is selected for flow (suction, discharge) (see FIG. 2).

  First, the first valve 6a will be described with reference to FIGS. As described above, reference numeral 61 denotes a first opening, and 62 denotes an engagement flange portion. Thus, 65 is a short cylindrical guide projection fitted and supported in the fitting hole 31 of the pump head 3, and this guide projection 65 corresponds to the tip shaft portion of the inner valve 6. The guide protrusion 65 has a function of guiding the rod 71 of the plunger 7.

  Reference numeral 66a denotes an axial outer wall portion provided in an umbrella shape at the rear end portion of the guide protrusion 65, and the first opening 61 is formed in an arc shape at an appropriate position of the axial outer wall portion 66a. Reference numeral 66b denotes a radially outer wall portion (cylinder forming portion) at both end openings, and the engaging flange portion 62 is provided around the inner end portion of the radially outer wall portion 66b. The outer diameter dimension of the engaging flange portion 62 is designed in consideration of the inner diameter dimension of the annular recess 27 of the outer cylinder 2.

  By the way, in this embodiment, in order to attach the seal 8 to the umbrella-shaped axial outer wall portion 66a, a plurality of attachment holes (internal threads) 68 for the fasteners 67 are provided. Eight mounting holes 68 are formed at predetermined intervals in the circumferential direction of the engaging flange portion 62. The attachment hole 68 becomes a plurality of engagement protrusions or engagement grooves depending on the attachment of the seal 8.

  Next, the 2nd valve 6b is demonstrated with reference to FIG.11 and FIG.12. As described above, reference numeral 63 denotes an inner end flange portion that makes surface contact with the engaging flange portion 62, and 64 denotes a second opening having the same shape as the first opening 61. Here, since the 2nd valve 6b is the same as the 1st valve 6a, it attaches | subjects the same code | symbol and demonstrates easily.

  Thus, 65A is a guide projection corresponding to the rear end portion of the inner valve 6, and this guide projection 65A is longer than the guide projection 65 at the tip. The guide protrusion 65A also has a function of guiding the rod 71 of the plunger 7, and a gear of a power transmission mechanism (not shown) is appropriately fixed to the protruding end portion. Reference numeral 66A denotes an umbrella-shaped axial outer wall portion, and a plurality of mounting holes (internal threads) 68A for the fixing tool 67A are provided to attach the other seal 8 to the outer wall surface of the outer wall portion 66A.

  When the first valve 6a and the second valve 6b are integrally engaged via the engaging flange portion 62, the inner end flange portion 63, and the plurality of inner valve fixing tools 69, the inside of the inner valve 6 is predetermined. It becomes volume. For example, a fluid such as tomato chips, mayonnaise, ice cream, and soup flows into the inner valve 6.

(7) Seal The seal has a peripheral hole formed in a circular shape, and has a center hole 81 into which the guide protrusion (65, 65A) of the inner valve 6 is fitted and inserted in the center, and the center hole 81 is a concentric circle. One or two arc-shaped through holes and a plurality of mounting portions are provided.

  In this embodiment, since one seal 8 and the other seal 8 have the same structure, only one seal 8 will be described here, and the other seal 8 will be denoted by the same reference numeral and redundant description will be omitted. The seal 8 of the present embodiment is fixedly attached in a state where the guide protrusion 65 (65A) of the inner valve 6 is fitted on the outer wall surface of the axially outer wall portion 66a (66A) of the inner valve 6.

  As shown in FIG. 2, the seal 8 is interposed between the inner wall surface 3b (4b) of the pump head 3 (4) of the valve body 1 and the umbrella-shaped axial outer wall portion 66a (66A) of the inner valve 6. Then, it rotates together with the inner valve 6. Therefore, the seal 8 is in sliding contact with the inner wall surface 3b (4b) of the pump head 3 (4).

  As shown in FIGS. 13 and 14, a central hole 81 that fits into the guide protrusion 65 (65 </ b> A) of the inner valve 6 is formed at the center of the cap-shaped or umbrella-shaped seal 8. The seal 8 having a center hole is formed in a trumpet shape corresponding to the shape of the outer wall surface of the umbrella-shaped axial outer wall portion 66a (66A) of the inner valve 6. In addition, an appropriate portion of the seal 8 communicates with the opening 61 (64) of the inner valve 6 and is a long hole-like through hole (for example, a semicircular arc shape) that can selectively communicate with the suction hole and the discharge hole of the valve body 1. ) 82 is formed. The peripheral edge of the seal 8 is circular.

  The form of the seal 8 and the through hole 82 can be arbitrarily changed as long as the object of the invention is achieved. As described above, the seal 8 of this embodiment is a plunger that reciprocates the inner valve 6 via the inner wall surface 3b (4b) of the pump head 3 (4) when the tightening means 5 is directly or indirectly tightened. 7 is pressed in the axial direction (outer wall surface of the inner valve). The seal 8 is formed with a plurality of through-holes 83 for the fasteners 67 (67A) to be attached to the inner valve 6 in the circumferential direction. The through small hole 83 is an example of an attachment portion.

  In the column of this embodiment, the second embodiment, the third embodiment, and the fourth embodiment will be described. In the description of these embodiments, the reference numerals of the first embodiment are used for convenience in order to avoid redundant description.

  That is, the seal 8A of the plunger type pump X1 of the second embodiment shown in FIGS. 15 and 16 is the same as the seal 8A of the first embodiment, but the umbrella-shaped axial outer walls 66a and 66A of the inner valve 6 In contrast to the trumpet shape corresponding to the shape of the wall surface, it is formed in a disk shape.

  Therefore, the axial outer wall portions 66a and 66A before and after the inner valve 6A are vertical. Therefore, the long suction holes 32 and 42, the discharge holes 33 and 43, the through holes 82 of the seal 8A, the first opening 61 and the second opening 64 of the inner valve 6 respectively formed in the left and right pump heads The jar 7 is oriented in the axial direction. Even if comprised in this way, the same effect as the said 1st Example can be acquired.

  Next, a third embodiment and a fourth embodiment will be described. Since these embodiments are design variations of the seals 8 and 8A, FIG. 2 and FIG.

  A seal 8C shown in FIGS. 17 and 18 is a modification of the seal 8 of the first embodiment. The seal 8 </ b> C is fixedly attached to a wall surface (inner wall surface) on the axial direction side of the pump heads 3 and 4 via a plurality of attachment portions 83.

  Since the pump heads 3 and 4 have the semicircular suction holes 32 and 42 and the discharge holes 33 and 43, respectively, as described above, the trumpet seal 8C is also a pair of semicircular through holes in line symmetry. 82, 82. The attachment portion 83 may be a through hole, but has a plurality of engaging projections formed in the circumferential direction.

  Therefore, a plurality of engagement holes (attachment holes) 68 that engage with the engagement protrusions 83 of the seal 8 </ b> C are formed on the wall surfaces (inner wall surfaces) of the pump heads 3 and 4.

  A seal 8D shown in FIGS. 19 and 20 is a modification of the seal 8A of the second embodiment. Similarly to the seal 8C, the seal 8D is fixedly attached to the wall surface (inner wall surface) on the axial direction side of the pump heads 3 and 4 via a plurality of attachment portions 83, respectively. Therefore, the description which overlaps by attaching | subjecting the same code | symbol to the same part is omitted.

  In addition, since said attachment part 83 has a relationship of a male and a female, when an engagement protrusion is formed in the wall surface of the pump heads 3 and 4, it becomes a penetration small hole.

  The present invention is a plunger-type pump seal structure for fluid that can discharge fluid continuously or intermittently at a constant flow rate and pressure. Therefore, it is suitable for pumping fluid such as tomato cake chips, mayonnaise, and soup with ingredients from a supply source to a filling object (container). In addition, a use is an example and if it is a fluid, it can utilize besides foodstuffs, such as a paint. It can also be used for gases (such as carbon dioxide) and liquids (such as drinking water).

1 to 14 are explanatory views showing a first embodiment of the present invention. FIG. 15 to FIG. 16 are explanatory diagrams (second embodiment) in which a part of the first embodiment is redesigned. 17 and 18 show a third embodiment (particularly a modified example of the seal). 19 and 20 show a fourth embodiment (particularly a modification of the seal).
The perspective view on the external appearance of a pump. Schematic cross-sectional explanatory drawing which shows the internal structure of a pump. The schematic cross-section explanatory drawing of the outer cylinder of a valve main body. Explanatory drawing of the side surface of an outer cylinder. The schematic cross-section explanatory drawing of one pump head. Explanatory drawing seen from the inner wall surface of one pump head. The schematic cross-section explanatory drawing of the other pump head. The perspective view of an inner valve (1st valve). Explanatory drawing seen from the axial direction outer wall surface of the 1st valve. The schematic cross-section explanatory drawing of a 1st valve. Explanatory drawing seen from the inner wall surface of an inner valve (2nd valve). The schematic cross-section explanatory drawing of a 2nd valve. The perspective view of a seal | sticker. The perspective view of the seal | sticker seen from the other side. FIG. 3 is a schematic sectional explanatory view similar to FIG. 2. The perspective view of the seal | sticker of 2nd Example. The front view of the seal | sticker of 3rd Example. FIG. 18 is a cross-sectional view taken along line 18-18 in FIG. The front view of the seal | sticker of 4th Example. FIG. 20 is a sectional view taken along line 20-20 in FIG.

X ... Plunger type pump, 1 ... Valve body, 2 ... Outer cylinder of valve body, 21 ... Mounting base part, 22 ... Vertical support part, 23 ... Outer cylinder part, 26 ... Annular recess, 27 ... Through hole, 3 ... one pump head, 3a ... inner wall surface, 3b ... outer wall surface, 31 ... fitting hole, 32 ... first suction hole, 33 ... first discharge hole (delivery hole), 34 ... female screw, 35 ... recess, 4 ... the other pump head, 4a ... inner wall surface, 4b ... outer wall surface, 41 ... fitting hole, 42 ... second suction hole, 43 ... second discharge hole (delivery hole), 44 ... female screw, 45 ... fitting recess 46, annular recess, 47 ... annular space, 5 ... tightening means, 6 ... inner valve, 6a ... first valve, 6b ... second valve, 61 ... first opening, 62 ... coupling flange, 63 ... inside End flange 64, second opening 65, 65A, guide projection 66a, 66A, axial outer wall 66b, radial outer wall 6 67A ... Fastening tool, 68, 68A ... Mounting hole, 69 ... Inner valve fastening tool, 7 ... Plunger, 71 ... Rod, 72 ... Piston, 8, 8A, 8C, 8D ... Seal, 8a ... Outer wall surface, 81 DESCRIPTION OF SYMBOLS ... Center hole, 82 ... Through-hole, 83 ... Through-hole, 9 ... 1st suction pipe for fluid, 10 ... 2nd suction pipe for fluid, 11 ... 1st discharge pipe for fluid, 12 ... 1st suction pipe for fluid 2 discharge pipes, 15 ... end caps, 16, 69 ... fixing tools, 17 ... support plates.

Claims (7)

This is a plunger type pump seal structure that removably couples the outer cylinder of the valve body and the pump head via a tightening means, and can selectively communicate with the suction hole and the discharge hole formed in the pump head. rotatably provided a cylindrical inner valve to the valve body having an opening, the wall surface of the axial end of the inner valve, as well as the opening and the communicating of the inside valve, selectively to the suction hole and the discharge hole A seal having a communicating hole is fixedly attached. When the tightening means is tightened, the seal is pressed in the axial direction of the plunger that reciprocates the inner valve through the inner wall surface of the pump head. A plunger-type pump seal structure characterized by
The valve main body according to claim 1, the valve body is composed of an outer cylinder and left and right pump heads integrally coupled to the vertical support portion having the left and right flange functions of the outer cylinder through fastening means, respectively. The peripheral part is formed in a circular shape, and the central part has a central hole into which the guide projection of the inner valve is inserted. Further, one or two arc-shaped through holes and a plurality of attachments having the central hole as a concentric circle A plunger-type pump seal structure characterized by having a portion.
3. The plunger type pump according to claim 1, wherein the seal is interposed between each inner wall surface of the pair of front and rear pump heads and an axial outer wall portion of the inner valve. Seal structure.
3. The plunger-type pump seal structure according to claim 1, wherein the seal is formed in a trumpet shape corresponding to the shape of the outer wall surface of the axially outer wall portion of the inner valve.
3. The seal structure for a plunger type pump according to claim 1, wherein the seal is formed in a disk shape corresponding to the shape of the outer wall surface of the axial outer wall portion.
This is a plunger-type pump seal structure that removably couples the outer cylinder of the valve body and the pump head via a tightening means, and is selected for each of the long suction holes and discharge holes formed in the pump head. to provide a cylindrical inner valve having an opening communicable elongated shape rotatably on the valve body, the wall surface of the axial direction of the pump head, communicates with the opening in said valve, in the circumferential direction A seal having a pair of elongated holes that can be selectively communicated with the suction hole and the discharge hole is fixedly attached. When the tightening means is tightened, the seal is connected to the inner valve via the wall surface of the inner valve. A plunger-type pump seal structure, wherein the plunger is pressed in the axial direction of a plunger that reciprocates.
The valve body according to claim 6 includes an outer cylinder and left and right pump heads integrally coupled to the vertical support portion having the left and right flange functions of the outer cylinder through a plurality of fastening screws, respectively. The seal has a circular peripheral edge, a central hole into which the guide projection of the inner valve is fitted, and one or two arc-shaped through holes each having a concentric circle as the central hole. A plunger type pump seal structure characterized by having a plurality of mounting portions.

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