Liquid inlet and outlet nozzle of plunger pump

Abstract

The utility model discloses a plunger pump liquid inlet and outlet nozzle which is detachably arranged in a channel hole formed in a plunger pump body, an annular groove is formed in the end face of the bottom of the liquid inlet and outlet nozzle, the groove is independently arranged relative to a central hole of the liquid inlet and outlet nozzle, a sealing ring is detachably arranged in the groove, and the inner diameter of the sealing ring is slightly smaller than that of the groove. When the sealing ring is assembled in the groove, the inner ring of the sealing ring is tightly attached to the groove wall of the inner side of the groove. The sealing ring can be firmly hooped on the groove wall of the inner side of the groove through the tensioning force of the inner ring of the sealing ring, good limiting is achieved, the sealing ring is prevented from rotating, dislocation and even falling off when the liquid inlet and outlet nozzle is horizontally pushed, and the sealing effect is prevented from being affected.

Description

Technical Field

[0001] The utility model relates to the technical field of filling equipment, in particular to a liquid inlet and outlet nozzle of a plunger pump. Background Art

[0002] Plunger pumps are widely used in fields such as medicine and chemical industry. The pump rod of the plunger pump reciprocates in the cylinder block, and the purpose of liquid suction and liquid discharge is achieved through the volume change of the internal cavity of the plunger pump, so as to complete the precise metering filling of pharmaceutical oral liquids, injections, chemical liquids, etc.

[0003] As Figures 1-3 shown in the structural schematic diagram of the existing liquid inlet and outlet nozzle of the plunger pump, the plunger pump has a pump body, a rotary valve 3 rotatably arranged in the pump body, and a pump rod (not shown in the figure) slidably arranged up and down in the pump body. The outer shell 1 and the pump sleeve 2 of the pump body are both hollow cylinders. The pump sleeve 2 is nested in the outer shell 1. The pump body is provided with several channel holes 7 communicating with its interior. The channel holes 7 are used for liquid inlet or liquid outlet. Each channel hole 7 is correspondingly installed with a liquid inlet and outlet nozzle 4. The bottom of the central hole of the liquid inlet and outlet nozzle 4 is a stepped hole 42 with a circular arc chamfer. An O-ring 5 is arranged in the stepped hole 42. When the liquid inlet and outlet nozzle 4 is installed on the plunger pump, the O-ring 5, the bottom surface of the liquid inlet and outlet nozzle 4 and the stepped surface 21 of the pump body are in contact with each other to realize the seal between the pump body and the liquid inlet and outlet nozzle 4 and prevent the liquid inside the pump body from leaking out.

[0004] The plunger pump is usually vertically installed on the filling machine. There are usually more than a dozen or even dozens of plunger pumps on one filling machine, and the pipelines connecting the plunger pumps are intricate. It is difficult to disassemble and install the plunger pump. Therefore, if the O-ring 5 is damaged or aged after long-term use, it is necessary to disassemble and install the liquid inlet and outlet nozzle 4 to replace the O-ring 5. When installing the liquid inlet and outlet nozzle 4, it is necessary to first place the O-ring 5 in the stepped hole 42 so that the O-ring 5 is in close contact with the circular arc chamfer of the stepped hole 42, and then horizontally push the liquid inlet and outlet nozzle 4 into the channel hole 7 and tighten the nut 6 outside the liquid inlet and outlet nozzle 4 until the O-ring 5, the bottom surface of the liquid inlet and outlet nozzle 4 and the stepped surface 21 of the pump body are in contact with each other, then the installation of the liquid inlet and outlet nozzle 4 can be completed. However, the existing liquid inlet and outlet nozzle of the plunger pump has the following problems: Since the stepped hole 42 does not have a good limiting structure for the O-ring 5, during the process of horizontally pushing the liquid inlet and outlet nozzle 4, the O-ring 5 is prone to rotation, misalignment or even falling off, which is inconvenient for operation and easily leads to uneven installation of the liquid inlet and outlet nozzle 4 and poor sealing performance, and liquid leakage is likely to occur during the subsequent operation of the plunger pump. Summary of the Utility Model

[0005] In view of the disadvantages of the existing liquid inlet and outlet nozzles of plunger pumps, such as easy uneven installation and poor sealing effect caused by the rotation or detachment of the sealing ring during flat-push installation, the applicant provides a plunger pump liquid inlet and outlet nozzle with a reasonable structure. An annular groove for limiting the sealing ring is provided on the bottom end face thereof. The sealing ring can be tightly clamped on the inner side wall of the groove. When installing the liquid inlet and outlet nozzle, the sealing ring will not rotate, be misaligned or even fall off, making the disassembly and assembly of the liquid inlet and outlet nozzle relatively convenient and the sealing performance better.

[0006] The technical solution adopted by the present utility model and the achieved technical effects are as follows:

[0007] A liquid inlet and outlet nozzle of a plunger pump is detachably arranged in a channel hole opened on a plunger pump body. An annular groove is opened on the bottom end face of the liquid inlet and outlet nozzle. The groove is independently arranged relative to the central hole of the liquid inlet and outlet nozzle. A sealing ring is detachably arranged in the groove. The inner diameter of the sealing ring is slightly smaller than the inner diameter of the groove. When the sealing ring is assembled in the groove, the inner ring of the sealing ring is tightly attached to the inner side wall of the groove.

[0008] By using the tension force of the inner ring of the sealing ring, the sealing ring can be firmly clamped on the inner side wall of the groove, achieving better limiting, avoiding the rotation, misalignment or even detachment of the sealing ring when horizontally pushing the liquid inlet and outlet nozzle, and avoiding affecting the sealing effect.

[0009] As a further improvement of the above technical solution:

[0010] The height of the sealing ring is slightly greater than the depth of the groove. When the liquid inlet and outlet nozzle is installed in the channel hole, the sealing ring abuts against the step surface of the inner surface of the channel hole.

[0011] The liquid inlet and outlet nozzle is tightly assembled with the channel hole through a nut sleeved on its outer periphery.

[0012] The height of the sealing ring is slightly greater than the depth of the groove. When the liquid inlet and outlet nozzle is horizontally pushed into the channel hole and the nut outside the liquid inlet and outlet nozzle is tightened, the liquid inlet and outlet nozzle can be installed in the channel hole. At this time, the sealing ring abuts against the step surface of the pump sleeve, realizing the sealing between the liquid inlet and outlet nozzle and the pump body and avoiding the leakage of the liquid in the pump body.

[0013] The sealing ring is a silica gel sealing ring, which has good sealing and tensile resistance performance and prolongs the service life. Description of the Drawings

[0014] Figure 1 It is a structural schematic diagram of the existing liquid inlet and outlet nozzle of a plunger pump.

[0015] Figure 2 It is an installation structural schematic diagram of the existing liquid inlet and outlet nozzle of a plunger pump.

[0016] Figure 3 For Figure 2 The enlarged view of part A in

[0017] Figure 4 This is a schematic structural diagram of the present utility model.

[0018] Figure 5 This is a schematic installation structure diagram of the present utility model.

[0019] Figure 6 is Figure 5 an enlarged view of part B in

[0020] In the figure: 1, outer shell; 2, pump sleeve; 21, stepped surface; 3, rotary valve; 4, liquid inlet and outlet nozzle; 41, groove; 42, stepped hole; 5, sealing ring; 6, nut; 7, passage hole. Specific embodiments

[0021] The following combines with the attached drawings to illustrate the specific embodiments of the present utility model.

[0022] As Figures 4-6 shown, the plunger pump of the present utility model has a pump body, a rotary valve 3 rotatably arranged in the pump body, and a pump rod (not shown in the figure) slidably arranged up and down in the pump body. The metal outer shell 1 and the ceramic pump sleeve 2 of the pump body are both hollow cylinders. The pump sleeve 2 is nested in the outer shell 1. The rotary valve 3 rotates in the pump sleeve 2. The pump body is provided with a number of passage holes 7 that are communicated with its interior and are used for liquid inlet or outlet. Its inner surface has a stepped surface 21. In this embodiment, the stepped surface 21 is located on the outer surface of the pump sleeve 2.

[0023] Each passage hole 7 is correspondingly installed with a liquid inlet and outlet nozzle 4. An annular groove 41 independent of the central hole is opened on the bottom end surface of the liquid inlet and outlet nozzle 4. There is an annular wall surface between the groove 41 and the central hole of the liquid inlet and outlet nozzle 4, which is the inner groove wall of the groove 41. A sealing ring 5 is arranged in the groove 41. The sealing ring 5 is a silica gel sealing ring, and its inner diameter is slightly smaller than the inner diameter of the annular groove 41. When the sealing ring 5 is snapped into the groove 41, the sealing ring 5 can be firmly clamped on the inner groove wall of the groove 41 by the tension force of the inner ring of the sealing ring 5, realizing good positioning and avoiding the rotation, dislocation or even falling off of the sealing ring 5 when the liquid inlet and outlet nozzle 4 is horizontally pushed. The height of the sealing ring 5 is slightly greater than the depth of the groove 41. The liquid inlet and outlet nozzle 4 is horizontally pushed into the passage hole 7 and the nut 6 outside the liquid inlet and outlet nozzle 4 is tightened, and the liquid inlet and outlet nozzle 4 can be installed in the passage hole 7. At this time, the sealing ring 5 abuts against the stepped surface 21 of the pump sleeve 2, realizing the sealing between the liquid inlet and outlet nozzle 4 and the pump body and avoiding the leakage of the liquid in the pump body.

[0024] When actually installing the liquid inlet and outlet nozzle 4, the staff first puts the sealing ring 5 into the groove 41. The sealing ring 5 clamps the inner wall of the groove 41 to achieve positioning. Then, the liquid inlet and outlet nozzle 4 is horizontally pushed into the channel hole 7, and the nut 6 outside the liquid inlet and outlet nozzle 4 is tightened to complete the installation of the liquid inlet and outlet nozzle 4. The sealing ring 5 abuts against the step surface 21 of the pump body to achieve the seal between the liquid inlet and outlet nozzle 4 and the pump body. If the sealing ring 5 is damaged or aged, only the liquid inlet and outlet nozzle 4 needs to be screwed out from the channel hole 7, without disassembling the whole plunger pump, which saves labor costs and greatly improves work efficiency. During the disassembly of the liquid inlet and outlet nozzle 4, the sealing ring 5 still clamps in the groove 41, and the sealing ring 5 can be manually pulled out to replace it, and the operation is relatively convenient.

[0025] The above description is an explanation of the present invention, not a limitation of the present invention. Without departing from the spirit of the present invention, the present invention can be modified in any form. For example, the liquid inlet and outlet nozzle 4 of the present invention can be assembled on any type of plunger pump.

Claims

1. A liquid inlet / outlet nozzle of a plunger pump, which is detachably arranged in a channel hole (7) formed on a plunger pump body, and is characterized in that: The bottom end face of the liquid inlet and outlet nozzle (4) is provided with an annular groove (41). The groove (41) is independently arranged relative to the central hole of the liquid inlet and outlet nozzle (4). A sealing ring (5) is detachably arranged in the groove (41). The inner diameter of the sealing ring (5) is slightly smaller than the inner diameter of the groove (41). When the sealing ring (5) is assembled in the groove (41), the inner ring of the sealing ring (5) is in close contact with the inner groove wall of the groove (41).

2. The liquid inlet / outlet nozzle of the plunger pump according to claim 1, characterized in that: The height of the sealing ring (5) is slightly greater than the depth of the groove (41). When the liquid inlet and outlet nozzle (4) is installed in the channel hole (7), the sealing ring (5) abuts against the step surface (21) on the inner surface of the channel hole (7).

3. The liquid inlet and outlet nozzles of the plunger pump according to claim 1, characterized in that: The liquid inlet and outlet nozzle (4) is tightly assembled with the channel hole (7) by a nut (6) sleeved on its outer periphery.

4. The liquid inlet and outlet nozzles of the plunger pump according to claim 1, characterized in that: The sealing ring (5) is a silica gel sealing ring.

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