JP5363435B2 - Reciprocating pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reciprocating pump which downsizes a manifold and supplies liquid with a simple configuration to a high pressure seal and a low pressure seal. <P>SOLUTION: A cylinder protruding part 4a is formed by providing a suction port 55 and a discharge port 56 in a manifold 5 and causing at least part of a cylinder part 4 to protrude from the manifold 5. By a cylindrical communication pipe 6 arranged on the outside of the cylinder protruding part 4a protruding from the manifold 5, a communication flow passage 61 is formed between the cylinder protruding part 4a and the communication pipe 6. Between a high pressure seal 45 and a low pressure seal 46, a penetrating flow passage 43 penetrating through the inside of the cylinder part 4 and the communication flow passage 61 is provided. Thereby, flow passages 53, 61, 43 connected from a manifold flow passage 53 to the penetrating flow passage 43 via the communication flow passage 61 are formed. Through the flow passages 53, 61, 43, a liquid is supplied from the manifold flow passage 53 side to between the high pressure seal 45 and the low pressure seal 46 on the inside of the cylinder part 4. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a reciprocating pump.

  2. Description of the Related Art Conventionally, a reciprocating pump is known in which a reciprocating member reciprocates in a cylinder unit according to driving of a driving unit to perform a pumping action of a liquid such as water in a pump chamber formed on the tip side in the cylinder unit. (For example, see Patent Documents 1 and 2). In such a reciprocating pump, in order to prevent liquid from leaking from the pump chamber side to the drive portion side, a high pressure seal is provided on the pump chamber side in the cylinder portion, and a low pressure seal is provided on the drive portion side in the cylinder portion. Is provided in liquid-tight sliding contact with the reciprocating member.

  By the way, if the high pressure seal or the low pressure seal is worn or baked, the liquid leaks from the pump chamber, and the pump cannot maintain the specified pressure. In addition, there is a captive that liquid easily enters the drive unit, the lubricating oil is contaminated and deteriorated to lose lubricity, and seizure occurs in the drive unit, causing pump damage. For this reason, it is necessary to lubricate and cool the high pressure seal and the low pressure seal.

  For example, Patent Document 1 discloses a reciprocating pump that houses a cylinder portion in a manifold having a suction port for introducing liquid into the pump chamber and a discharge port for discharging liquid compressed in the pump chamber. Among them, a configuration is disclosed in which liquid is supplied from a suction port to a high-pressure seal and a low-pressure seal respectively provided in a portion housed in the manifold through a flow path provided in the manifold, and each seal is lubricated and cooled. ing.

  Patent Document 2 includes a first manifold having a discharge port for discharging liquid compressed in the pump chamber, and a second manifold having a suction port for introducing liquid into the pump chamber. A reciprocating pump provided with a high-pressure seal and a low-pressure seal that are in sliding contact with a reciprocating member, and supplying liquid from the suction port to the high-pressure seal and the low-pressure seal through a flow path provided in the second manifold. And the structure which lubricates and cools each seal | sticker is disclosed.

Japanese Utility Model Publication No. 63-26780 JP 2010-53861 A

  As described above, any type of reciprocating pump described in Patent Documents 1 and 2 requires a reduction in the size of the manifold, and is optimal for lubricating and cooling the high pressure seal and the low pressure seal. Various aspects are also desired.

  The present invention has been made to solve these problems, and provides a reciprocating pump capable of reducing the size of the manifold and supplying liquid with a simple configuration to the high-pressure seal and the low-pressure seal. The purpose is to do.

In the reciprocating pump (100) according to the present invention, the reciprocating member (1) reciprocates in the cylinder part (4) in accordance with the driving of the driving parts (21, 22, 23), thereby A reciprocating pump (100) that performs a pumping action in a pump chamber (40) formed on the front end side of the suction chamber, and houses the pump chamber (40) and introduces liquid into the pump chamber (40) A manifold (5) having an outlet (55) and a discharge port (56) for discharging the liquid compressed in the pump chamber (40), and a pump chamber (40) side in the cylinder part (4) are reciprocated. A high-pressure seal (45) that is in fluid-tight sliding contact with the moving member (1) and a reciprocating member (1) that is disposed on the drive portion (21, 22, 23) side in the cylinder portion (4) in fluid-tight contact. A low pressure seal (46), and a reciprocating pump (100 , At least a part of the cylinder part (4) protrudes from the manifold (5) to the drive part (21, 22, 23) side to form a cylinder protrusion part (4a), and the outside of the cylinder protrusion part (4a) A communication pipe (6) formed in a cylindrical shape covering the outer peripheral surface of the cylinder protrusion (4a) with a predetermined gap and forming a communication channel (61) between the outer periphery of the cylinder protrusion (4a). Between the high pressure seal (45) and the low pressure seal (46) of the cylinder protrusion (4a) formed in the manifold (5) and guiding the liquid to the communication flow path (61). And a through-flow passage (43) penetrating the communication passage (61) inside the cylinder protrusion (4a) and outside the cylinder protrusion (4a), and a high-pressure seal (45) and a low-pressure seal (46) In the cylinder protrusion (4a) It is characterized in that the location.

According to such a reciprocating pump (100), the manifold (5) is provided with the suction port (55) and the discharge port (56), and the cylinder protrusion (4a) protrudes from the manifold (5). The size of the manifold (5) can be reduced as compared with the prior art in which the entire cylinder portion is covered with the manifold. In addition, the liquid flows from the manifold channel (53) to the communication channel (61) formed between the cylindrical communication pipe (6) outside the cylinder projection (4a) and the cylinder projection (4a). Between the high pressure seal (45) and the low pressure seal (46) inside the cylinder part (4) through the through passage (43) passing through between the high pressure seal (45) and the low pressure seal (46). To be supplied. Thus, even if it is the structure which at least one part of a cylinder part (4) protrudes from a manifold (5), a cylinder protrusion part (( The liquid can be supplied into 4a) with a simple configuration, and the high pressure seal (45) and the low pressure seal (46) can be lubricated and cooled. Moreover, although the high pressure seal (45) and the low pressure seal (46) are arranged in the cylinder protrusion (4a), both the high pressure seal (45) and the low pressure seal (46) are located in the cylinder protrusion (4a). Even in this case, liquid can be supplied to both the high-pressure seal (45) and the low-pressure seal (46) via the flow path (53, 61, 43), and the high-pressure seal (45) and the low-pressure seal The lubrication and cooling of (46) can be performed.

  The manifold channel (53) preferably connects the suction port (55) and the communication channel (61). According to this, since the suction port (55) and the communication channel (61) are connected by the manifold channel (53), a part of the liquid introduced into the pump chamber (40) from the suction port (55) is obtained. The communication channel 61 can be led. For this reason, it is not necessary to provide the manifold (5) with a dedicated suction port for supplying liquid to the high pressure seal (45) and the low pressure seal (46).

  As described above, according to the present invention, it is possible to provide a reciprocating pump capable of reducing the size of the manifold and supplying liquid with a simple configuration to the high-pressure seal and the low-pressure seal.

It is a longitudinal cross-sectional view which shows the reciprocating pump which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view which expands and shows the principal part of FIG. It is a horizontal direction sectional view of the reciprocating pump shown in FIG. It is III-III sectional drawing of the reciprocating pump shown in FIG. It is IV-IV sectional drawing of the reciprocating pump shown in FIG. It is a perspective view which shows the back surface of the reciprocating pump shown in FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a reciprocating pump according to the invention will be described with reference to the accompanying drawings. 1 is a longitudinal sectional view showing a reciprocating pump according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing an enlarged main part of FIG. 1, and FIG. 3 is a reciprocating pump shown in FIG. FIG. 4 is a sectional view taken along the line III-III of the reciprocating pump shown in FIG. 3, FIG. 5 is a sectional view taken along the line IV-IV of the reciprocating pump shown in FIG. 3, and FIG. It is a perspective view which shows a back surface.

  As shown in FIGS. 1-6, the reciprocating pump 100 comprises three reciprocating members 1 having a plunger 1a and a plunger rod 1b connected to the plunger 1a in parallel (see FIG. 3). It is a dynamic pump, and is configured by connecting a manifold 5 and three cylinder parts 4 to a crankcase 2 via a cylinder base metal fitting 3.

  The manifold 5 houses the front end side of the cylinder part 4 and the pump chamber 40 at the front end, and introduces a working liquid (hereinafter referred to as “liquid”) into the pump chamber 40 and in the pump chamber 40. A discharge port 56 for discharging the compressed liquid, a suction valve 51 between the pump chamber 40 and the suction port 55, and a discharge valve 52 between the pump chamber 40 and the discharge port 56, respectively. doing.

  The portion of the cylinder portion 4 on the crankcase 2 side protrudes from the manifold 5, and the protruding portion (cylinder protruding portion 4 a) is covered with a communication pipe 6 on the outside. In particular, as shown in FIG. 5 and FIG. 6 and the like, the manifold 5 and the cylinder base metal 3 are arranged so that the hexagon socket head cap screw 80 passed through the cylinder base metal 3 is screwed into the manifold 5 to interpose the cylinder part 4 therebetween. Connected in a sandwiched state. Further, the cylinder base metal 3 is coupled to the crankcase 2 by passing through four bolts 90 attached to the crankcase 2 and tightening a nut 91 screwed into the bolt 90.

  The hexagon socket head cap bolt 80 is composed of eight hexagon socket head cap bolts 81A, 81B, 81C, 81D, 82A, 82B, 82C, 82D, as shown in FIGS. Four hexagon socket head bolts 81 </ b> A to 81 </ b> D are arranged in this order along the direction of installation, and the four hexagon socket head cap screws 81 </ b> A to 81 </ b> D are opposed to the four hexagon socket head bolts 81 </ b> A to 81 </ b> D with the cylinder portion 4 interposed therebetween. Bolts 82A to 82D are arranged in this order. In particular, as shown in FIG. 4, among the hexagon socket head cap bolts 80, the four hexagon socket head cap bolts 81B, 81C, 82B and 82C on the center side in the direction in which the cylinder portions 4 are arranged are The distance between the holed bolt 82B and the distance between the hexagonal socket bolt 81C and the hexagonal socket bolt 82C are as follows. And the distance between the hexagon socket head cap bolt 81D and the hexagon socket head cap bolt 82D.

  Inside the crankcase 2, a crankshaft 21, a connecting rod 22, and a piston pin 23 that constitute a drive unit of the reciprocating member 1 are disposed, and the crankshaft 21 rotates so as to pass through the connecting rod 22 and the piston pin 23. The reciprocating member 1 reciprocates in the left-right direction in FIG. 1 in the cylinder portion 4, and the pump chamber 40 formed on the tip side in the cylinder portion 4 is pressurized / depressurized by the reciprocating member 1. It is said that.

  Specifically, as shown in FIG. 1 in particular, when the reciprocating member 1 moves toward the crankshaft 21 side, the pump chamber 40 is depressurized, and the valve body 51a of the intake valve 51 provided in the manifold 5 and the discharge are discharged. The valve body 52a of the valve 52 is opened and closed, and the liquid is sucked into the pump chamber 40 from the suction port 55 provided in the manifold 5 through the flow path of the suction valve 51, while the reciprocating member 1 is cranked. When moving toward the opposite side of the shaft 21, the pump chamber 40 is pressurized, the valve body 51 a of the suction valve 51 and the valve body 52 a of the discharge valve 52 are closed and opened, and the liquid in the pump chamber 40 is discharged from the discharge valve 52. The liquid is discharged to the discharge port 56 provided in the manifold 5 through the flow path and is configured to perform a pumping action for sucking and discharging the liquid.

  The manifold 5 is formed with an insertion hole 58 on the end face on the crankcase 2 side, into which the tip of the cylinder portion 4 is inserted. In particular, as shown in FIG. 2, the insertion hole 58 has a larger diameter than the small-diameter hole 58 a, the medium-diameter hole 58 b having a larger diameter than the small-diameter hole 58 a, and a large-diameter larger than the medium-diameter hole 58 b, in this order A diameter hole 58c is formed.

  The manifold 5 is provided with a manifold channel 53 that connects the suction port 55 and the inside of the insertion hole 58 in the vicinity of both ends of the cylinder portion 4 in the juxtaposed direction. The manifold channel 53 includes a straight channel 53a and a slit channel 53b (see FIGS. 3 and 4).

  The straight flow path 53a is formed in a straight line having one end connected to the suction port 55 and the other end opened to the surface of the manifold 5 on the crankcase 2 side. The opening on the crankcase 2 side in the linear flow path 53 a is sealed with a plug 59.

  The slit-shaped channel 53b is formed near the end of the manifold 5 on the crankcase 2 side, and connects the linear channel 53a and the inside of the large-diameter hole 58c of the insertion hole 58 adjacent to the linear channel 53a. At the same time, it is formed in a slit shape that connects the large-diameter holes 58 c in the adjacent insertion holes 58.

  As shown in FIG. 2 in particular, the cylinder part 4 is configured by connecting a tubular first cylinder part 41 constituting the front half part and a tubular second cylinder part 42 constituting the latter half part. The cylinder part 4 is inserted into the manifold 5 from the end on the first cylinder part 41 side, and a part of the first cylinder part 41 enters the manifold 5 while the first cylinder part 41 protruding from the manifold 5 A cylinder protruding portion 4 a formed by a part of the rear side and the second cylinder portion 42 is provided.

  In particular, as shown in FIG. 2, the manifold 5 side of the first cylinder portion 41 is a cylinder small-diameter portion 41a whose outer peripheral side is smaller in diameter than other portions, and this cylinder small-diameter portion 41a is connected to the cylinder portion 4 in the manifold. 5 is inserted into the small diameter hole 58a of the manifold 5. At this time, the step portion 41c between the cylinder small diameter portion 41a and the large diameter portion behind this, and the step portion 58d between the small diameter hole 58a and the medium diameter hole 58b in the insertion hole 58 come into contact with each other, and the cylinder The insertion depth of the part 4 is regulated.

  The outer periphery of the cylinder small-diameter portion 41a in the first cylinder portion 41 and the inner peripheral surface of the small-diameter hole 58a in the manifold 5 are liquid-tightly sealed by an O-ring 47 (see FIG. 2). A predetermined gap is provided between the inner peripheral surface of the medium diameter hole 58 b of the insertion hole 58 and the outer peripheral surface of the first cylinder part 41.

  A large-diameter portion 41b having an inner diameter larger than that of other portions is formed on the inner peripheral side of the end portion of the first cylinder portion 41 that is connected to the second cylinder portion. A high-pressure seal 45 that is in fluid-tight sliding contact with the reciprocating member 1 is disposed in the large-diameter portion 41b. The high-pressure seal 45 is an annular body that provides, for example, synthetic rubber. The high-pressure seal 45 (large-diameter portion 41 b) is disposed at a position protruding from the manifold 5 (outward from the manifold 5).

  A large-diameter portion 42b having an inner diameter larger than that of other portions is formed on the inner peripheral side of the end of the second cylinder portion 42 on the side in contact with the cylinder base fitting 3. A low-pressure seal 46 that is in fluid-tight sliding contact with the reciprocating member 1 is disposed in the large-diameter portion 42b. The low pressure seal 46 is an annular body that provides, for example, synthetic rubber. Thus, both the high pressure seal 45 and the low pressure seal 46 are disposed in the cylinder protrusion 4a.

  The second cylinder part 42 is formed with a small diameter part 42c having a small outer diameter at the end connected to the first cylinder part 41. On the outer periphery of the second cylinder portion 42, a seal 42a, which is an annular O-ring, which will be described later, is disposed on the large diameter portion behind the small diameter portion 42c (on the cylinder base metal 3 side). Further, the small diameter portion 42c of the second cylinder portion 42 is provided with a through passage 43 that penetrates the communication passage 61 (described later in detail) inside the second cylinder portion 42 and outside the second cylinder portion 42. Yes. By providing the small diameter portion 42c, the flow path width of the communication flow path 61 can be secured.

  As shown in FIG. 2 in particular, the communication pipe 6 has an end on the manifold 5 side inserted into the large-diameter hole 58c, and a predetermined gap is provided between the outer periphery of the cylinder protrusion 4a and the outer peripheral surface of the cylinder protrusion 4a. And is arranged so as to cover the outside of the cylinder protruding portion 4a. Thereby, the communication flow path 61 is formed between the inner peripheral surface of the communication pipe 6 and the outer peripheral surface of the cylinder protrusion 4a (the outer peripheral surfaces of the first cylinder portion 41 and the second cylinder portion 42).

  Then, the high pressure seal 45 is connected to the manifold 5 side by the second cylinder portion 42 in the large diameter portion 41b by connecting the cylinder base bracket 3, the cylinder portion 4, the communication pipe 6 and the manifold 5 with the hexagon socket head cap bolt 80. To the cylinder part 4. Similarly, the low-pressure seal 46 is pressed toward the manifold 5 by the cylinder base metal 3 in the large-diameter portion 42 b, and is thereby attached to the cylinder portion 4.

  Further, a seal 6a, which is an annular O-ring, is disposed on the outer peripheral surface of the end portion of the communication pipe 6 on the side inserted into the large diameter hole 58c, and the communication pipe 6 and the manifold 5 are sealed in a liquid-tight manner. The

  An annular step 6b that protrudes radially outward is provided on the outer peripheral surface of the communication pipe 6 at a position closer to the cylinder base metal 3 than the seal 6a. When the communication pipe 6 is inserted into the large-diameter hole 58c, the stepped portion 6b and the opening edge of the insertion hole 58 abut against each other, and the insertion depth of the communication pipe 6 is restricted.

  In addition, a space between the inner peripheral surface of the end of the communication pipe 6 on the cylinder base metal 3 side and the outer peripheral surface of the second cylinder portion 42 is sealed in a liquid-tight manner by a seal 42a.

  As described above, according to the reciprocating pump 100 in the present embodiment, the manifold 5 is provided with the suction port 55 and the discharge port 56, and the cylinder protruding portion 4a is configured by protruding at least a part of the cylinder portion 4 from the manifold 5. The Thus, since the whole cylinder part 4 is not the structure covered with the manifold 5, compared with the prior art in which the whole cylinder part is covered with a manifold, the size reduction of the manifold 5 can be achieved.

  Further, a communication channel 61 is formed between the cylinder protruding portion 4a and the communication tube 6 by the cylindrical communication tube 6 disposed outside the cylinder protruding portion 4a protruding from the manifold 5, and a high pressure seal 45 and a low pressure seal are formed. The through-flow channel 43 that penetrates the inside of the cylinder portion 4 and the communication channel 61 is provided between the manifold channel 46 and the flow channel 53 that connects the manifold channel 53 to the through-flow channel 43 via the communication channel 61. , 61, 43 are formed. As a result, liquid is supplied between the high pressure seal 45 and the low pressure seal 46 inside the cylinder portion 4 from the manifold flow path 53 side through the flow paths 53, 61, 43.

  Thus, even if a part of the cylinder portion 4 protrudes from the manifold 5, the cylindrical communication pipe 6 and the through flow path 43 are used to enter the cylinder protrusion 4 a located outside the manifold 5. The liquid can be supplied with a simple configuration, and the high pressure seal 45 and the low pressure seal 46 can be lubricated and cooled.

  More specifically, the liquid introduced into the cylinder projecting portion 4 a through the through flow path 43 passes through a cylindrical gap surrounded by the outer peripheral surface of the reciprocating member 1 and the inner peripheral surface of the second cylinder portion 42. The end surfaces of the high-pressure seal 45 and the low-pressure seal 46 can be reached via the high-pressure seal 45 and the low-pressure seal 46 can be lubricated and cooled.

  Further, since the suction port 55 and the communication channel 61 are connected by the manifold channel 53, a part of the liquid introduced into the pump chamber 40 from the suction port 55 can be guided to the communication channel 61. For this reason, it is not necessary to provide the manifold 5 with a suction port dedicated to the liquid supplied to the high pressure seal 45 and the low pressure seal 46.

  The present invention has been specifically described above based on the embodiment. However, the present invention is not limited to the above embodiment. For example, in the above embodiment, a part of the cylinder portion 4 protrudes from the manifold 5. Although it was set as the structure to perform, the structure from which substantially the cylinder part 4 protrudes may be sufficient.

  Further, although the high-pressure seal 45 (large diameter portion 41 b) is arranged at a position protruding from the manifold 5, a configuration located inside the manifold 5 may be used.

  DESCRIPTION OF SYMBOLS 1 ... Reciprocating member, 4 ... Cylinder part, 4a ... Cylinder protrusion part, 5 ... Manifold, 6 ... Communication pipe, 21 ... Crankshaft, 22 ... Connecting rod, 23 ... Piston pin, 40 ... Pump chamber, 43 ... Through-flow path 45 ... High pressure seal, 46 ... Low pressure seal, 53 ... Manifold channel, 55 ... Suction port, 56 ... Discharge port, 61 ... Communication channel, 100 ... Reciprocating pump.

Claims (2)

The reciprocating member (1) reciprocates in the cylinder part (4) according to the drive of the drive parts (21, 22, 23), so that a pump chamber (40 formed on the tip side in the cylinder part (4)) ) In which the pump chamber (40) is accommodated, and the inlet (55) for introducing liquid into the pump chamber (40) and the pump chamber (40). ) And a manifold (5) having a discharge port (56) for discharging the liquid compressed in the inside, and the reciprocating member (1) disposed on the pump chamber (40) side in the cylinder part (4). A high-pressure seal (45) that is in fluid-tight sliding contact, and a low-pressure seal that is disposed on the drive portion (21, 22, 23) side in the cylinder portion (4) and is in fluid-tight sliding contact with the reciprocating member (1) ( 46) and a reciprocating pump (100) equipped with Te,
At least a part of the cylinder part (4) protrudes from the manifold (5) to the drive part (21, 22, 23) side to constitute a cylinder protrusion (4a),
The cylinder projecting portion (4a) is formed in a cylindrical shape covering the outer surface of the cylinder projecting portion (4a) with a predetermined gap, and communicated between the outer surface of the cylinder projecting portion (4a). A communication pipe (6) forming a path (61);
A manifold channel (53) formed in the manifold (5) and guiding the liquid to the communication channel (61);
Between the high pressure seal (45) and the low pressure seal (46) of the cylinder protrusion (4a), the communication channel (61) inside the cylinder protrusion (4a) and outside the cylinder protrusion (4a). ) and through flow path through the (43), provided with,
The reciprocating pump (100), wherein the high pressure seal (45) and the low pressure seal (46) are disposed in the cylinder protrusion (4a ).   The reciprocating pump according to claim 1, wherein the manifold channel (53) connects the suction port (55) and the communication channel (61).

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