HYDRAULIC END ASSEMBLY STRUCTURE OF A PLUNGER PUMP

Abstract

A hydraulic end assembly structure of a plunger pump, comprising a valve housing assembly, a suction gland and a suction pressing cap. The suction gland is connected to the suction pressing cap, and the suction gland is connected to the valve housing assembly through the suction packing seal assembly.

Claims

1. A hydraulic end assembly structure of a plunger pump, comprising a valve housing assembly, a suction gland and a suction pressing cap, the suction gland is connected to the suction pressing cap, the suction gland is connected to the valve housing assembly through a suction packing seal assembly, wherein the suction packing seal assembly comprises a support ring, a soft packing, a hard packing and a packing junk ring which are connected successively, the packing junk ring is located at an end near the suction pressing cap, and the support ring is located at an end far from the suction pressing cap, and an inner surface of the support ring is in direct contact with a surface of the suction gland.

2. (canceled)

3. The hydraulic end assembly structure of a plunger pump according to claim 1, wherein the valve housing assembly comprises a valve spring seat cover, a valve spring seat, a valve spring, a valve body assembly and a valve seat assembly which are connected successively, the valve spring seat cover is used to limit the suction packing seal assembly.

4. (canceled)

5. The hydraulic end assembly structure of a plunger pump according to claim 1, wherein the valve housing assembly is provided with a limit block which is used to limit the suction packing seal assembly.

6. The hydraulic end assembly structure of a plunger pump according to claim 3, wherein the valve housing assembly is provided with a limit block which is used to limit the suction packing seal assembly.

7. The hydraulic end assembly structure of a plunger pump according to claim 1, wherein an end of the hard packing ring is in a form of convex shape fitted into a concave surface at an end of the packing junk ring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG. 1 is a schematic structural diagram of a hydraulic end assembly structure of a plunger pump according to an embodiment of the invention.

[0015] FIG. 2 is a schematic structural diagram of a suction packing seal assembly according to an embodiment of the invention.

[0016] Wherein, 1. valve housing, 2. suction gland, 3. suction pressing cap, 4. suction packing seal assembly, 5. valve spring seat cover, 6. valve spring seat, 7. valve spring, 8. valve body assembly, 9. valve seat assembly, 10. O-ring, 11. discharge gland, 12. discharge pressing cap, 13. check ring, 14. hoop, 15. plunger, 16. packing pressing cap, 17. plunger packing seal assembly, 18. support ring, 19. soft packing, 20. hard packing, 21. packing junk ring.

DESCRIPTION OF THE EMBODIMENTS

[0017] As shown in FIGS. 1 to 2, a new hydraulic end assembly structure of a plunger pump, comprising a valve housing assembly, a suction gland 2 and a suction pressing cap 3, the suction gland 2 is connected to the suction pressing cap 3, the suction gland 2 is connected to the valve housing assembly through the suction packing seal assembly 4 tightly. The sealing form of O-ring or D-ring in the prior art is replaced by the suction packing seal assembly 4 between the suction gland 2 and the valve housing 1, and there is no need to open grooves for filling the O-ring or D-ring in the processing of the suction gland 2 or the valve housing 1; good sealability; in view of the current continuous operation with high pressure and large displacement, in the actual use of the hydraulic end assembly, the sealing of the suction gland 2 by the suction packing seal assembly 4 can meet the sealing requirement under the current increasing pressure and fluid flushing more, compared with the O-ring or D-ring; reducing the abrasion of the suction gland 2 or/and the valve housing 1; further effectively prolonging the service life of the suction gland 2 or/and the valve housing 1. For the sealing form of O-ring or D-ring, it is common to open sealing grooves on the suction gland 2, at which case the abrasion of the valve housing 1 is greater than that of the suction gland 2 during the actual use; in turn, if the grooves are opened on the valve housing 1, the abrasion of the suction gland 2 is greater than that of the valve housing 1. However, wherever the grooves are opened, the only difference is to replace the suction gland 2 first or to replace the valve housing 1 first, it cannot fundamentally prolong the service life of the hydraulic end assembly in view of the current operation with high pressure and large displacement. That is, it is impossible to guarantee the continuous operation of the plunger pump under the above conditions.

[0018] The suction packing seal assembly 4 includes a support ring 18, a soft packing 19, a hard packing 20 and a packing junk ring 21 which are connected successively, the packing junk ring 21 is located at an end near the suction pressing cap 3, the support ring 18 is located at an end far from the suction pressing cap 3. Into the suction end of the valve housing assembly is put the suction packing seal assembly 4 (successively putting the support ring 18, the soft packing 19, the hard packing 20 and the packing junk ring 21), the suction gland 2 is inserted into the suction packing seal assembly 4, then the suction pressing cap 3 is tightened to compress the suction packing seal assembly 4 tightly, thus achieving the sealing between the valve housing assembly and the suction gland 2.

[0019] The valve housing assembly includes a valve spring seat cover 5, a valve spring seat 6, a valve spring 7, a valve body assembly 8 and a valve seat assembly 9 which are connected successively, and the valve spring seat cover 5 is used to limit the suction packing seal assembly 4. The valve housing assembly is provided with a limit block which is used to limit the suction packing seal assembly 4. No matter the limit of the valve spring seat cover 5 or the limit of the limit block, what is limited is the support ring 18. Of course, the limit of the valve spring seat cover 5 or the limit of the limit block are two different limit embodiments for the support ring 18, which are alternative and do not exist at the same time.

[0020] The valve housing assembly further includes a valve housing 1, an O-ring 10, a discharge gland 11, a discharge pressing cap 12, a check ring 13, a hoop 14, a plunger 15, a packing pressing cap 16, and a plunger packing seal assembly 17. The discharge gland 11 is located at the discharge end of the hydraulic end assembly. The discharge gland 11 is connected to the valve housing 1 through the O-ring 10 and the check ring 13. The discharge pressing cap 12 compresses the discharge gland 11 tightly. One end of the plunger 15 is connected to the hoop 14, and the other end of the plunger 15 is connected to the valve housing 1 tightly through the plunger packing seal assembly 17. The packing pressing cap 16 is used to fix the plunger packing seal assembly 17, which may also be sealed in other forms of the prior art, for example, being sealed with an O-ring or a D-ring.

[0021] It will be appreciated to persons skilled in the art that the present invention is not limited to the foregoing embodiments, which together with the context described in the specification are only used to illustrate the principle of the present invention. Various changes and improvements may be made to the invention without departing from the spirit and scope of the invention. All these changes and improvements shall fall within the protection scope of the invention, which is defined by the appended claims and equivalents thereof.