CN209212540U - A kind of pressure cut off valve arrangement for SA11V series plunger pump - Google Patents

Abstract

The utility model discloses a kind of pressure cut off valve arrangement for SA11V series plunger pump, the valve body including being machined with constant power valve installation cavity and pressure shut-off valve installation cavity, constant power valve installation cavity is made of constant power valve core cavity and constant power valve spring cavity；Pressure shut-off valve installation cavity includes the pressure regulating cavity for being equipped with the cutting spool chamber of cutting spool and being equipped with pressure adjusting component；Cutting spool is the combination valve core being made of the first spool and the second spool, and the second spool is machined with center oilhole, and the length of center oilhole is greater than the half of the second spool overall length, and the middle of the second spool is machined with radial direction oil hole；First spool is mounted in the center oilhole of the second spool, and the first spool forms limit round table, and the right side of the first spool is located at the left side of radial direction oil hole, and the hole section being on the right side of the first spool right side in center oilhole constitutes hydraulic cavities；The drain path for being connected to pressure regulating cavity and constant power valve spring cavity is machined in valve body.

Description

A kind of pressure cut off valve arrangement for SA11V series plunger pump

Technical field

The utility model relates to the design structures of hydraulic valve, more particularly to a kind of pressure for SA11V series plunger pump Power cuts off valve arrangement.

Background technique

In the prior art, the spool of the pressure shut-off valve of original SA11V series plunger pump pump head valve is a two section valves Core, the hole that spool is installed on corresponding valve body is also two section stepped holes, and is blind hole.The two sections spool and two section step blind holes exist Very high to concentricity, cylindricity requirement in use process, just the requirement to cutter and processing technology these two aspects is all very high for this, but In actual production since the various aspects such as cost, technology limit, above two aspect is not often all reached requirement, so it is difficult to ensure that The concentricity and cylindricity of spool, valve opening just reach the basic performance of product to increase fit clearance, but can make pressure in this way Stop valve leakage is big, slow so as to cause plunger pump pressure cut off functional response, cannot completely cut through, and increases fit clearance It can make that the pressure film of friction pair is unstable, is unevenly distributed, to make friction pair abrasion aggravation, influence entire plunger The service life of pump.

Summary of the invention

Technical problem to be solved in the utility model be in view of the above-mentioned state of the art, and provide handling ease, Assembly is simple, a kind of low pressure cut off valve arrangement for SA11V series plunger pump of production cost.

Technical solution adopted by the utility model to solve the above technical problems is as follows:

A kind of pressure cut off valve arrangement for SA11V series plunger pump, including it is machined with constant power valve installation cavity and pressure The plunger pump head valve valve body of power stop valve installation cavity, constant power valve installation cavity is by being equipped with the invariable power spool of invariable power spool Chamber and the constant power valve spring cavity composition for being equipped with constant power valve spring；Pressure shut-off valve installation cavity includes being equipped with cutting spool Cutting spool chamber and be equipped with pressure adjust component pressure regulating cavity；Cutting off spool is by the first spool and the second spool group The combination valve core constituted is filled, the second spool is machined with axially extending center oilhole, the length of center oilhole by the center of left side Degree is greater than the half of the second spool overall length, and the middle of the second spool is machined with the radial direction oil hole for being connected to center oilhole；The One spool is slidably mounted in the center oilhole of the second spool, and the first spool left end forms the spool with the second spool The limit round table of left side limit cooperation, the right side of the first spool are located at the left side of radial direction oil hole, and the is in center oilhole Hole section on the right side of one spool right side constitutes the hydraulic cavities for pushing the first spool and the relative movement of the second spool；It is processed in valve body There is the drain path for being connected to pressure regulating cavity and constant power valve spring cavity.

To optimize above-mentioned technical proposal, the measure taken further include:

Above-mentioned pressure adjust component by adjustment seat, little spring, big spring, left spring seat, right spring base, adjust screw and Sealing nut composition；Adjustment seat and the accent spiral of pressure regulating cavity are mutually equipped with；Right spring base, big spring, little spring and left bullet Spring abutment is sequentially arranged in the spring cavity of adjustment seat, and the bottom surface of left spring seat is matched with the press of the right end of the second spool, is adjusted Seat is machined with the adjusting threaded hole of perforation spring cavity, adjusts screw and is threaded through the right bullet for adjusting threaded hole and being located in spring cavity The bottom surface phase apical grafting of spring abutment, sealing nut spiral, which is mounted on, to be adjusted on screw and matches with the press of the end face of adjustment seat.

Above-mentioned little spring is sleeved in big spring, and the left end apical grafting of little spring is in the small annular end face of left spring seat On, on the small annular end face of the right spring base of right end apical grafting of the little spring, the big ring of the left end apical grafting of big spring in left spring seat On shape end face, on the big annular end face of the right spring base of right end apical grafting of the big spring.

The O-ring to seal, sealing nut press fitting are pressed between the accent of above-mentioned adjustment seat and pressure regulating cavity There is gasket.

Compared with prior art, the cutting spool of the utility model is the combination valve being made of the first spool and the second spool Core, the first spool are slidably mounted in the center oilhole of the second spool, need to process to reduce tradition cutting spool chamber The trouble of Cheng Erjie stepped hole, two traditional section stepped holes not only require the concentricity in two holes high, and the processing of cutter etc. Cost is also high, and the first spool is arranged in the second spool the utility model, so that traditional cutting spool chamber be made only to need to add Work goes out a hole.

The advantages of the utility model and effect are:

1, the utility model greatly reduces the difficulty of processing of spool and valve body, improves production efficiency, reduces processing Cost.

2, the utility model improves this fit quality secondary to friction of spool and valve opening, to improve pressure shut-off valve Reaction sensitivity and whole pump service life.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model；

Fig. 2 is the combining structure schematic diagram of combination valve core in Fig. 1；

Fig. 3 is the structural schematic diagram of the second spool in Fig. 2；

Fig. 4 is the structural schematic diagram of the first spool in Fig. 2；

Fig. 5 is the structural schematic diagram that pressure adjusts component in Fig. 1；

Fig. 6 is the structural schematic diagram of conventional pressure stop valve.

Specific embodiment

The embodiments of the present invention are described in further detail below in conjunction with attached drawing.

Fig. 1 to Fig. 5 is the structural schematic diagram of the utility model.

Appended drawing reference therein are as follows: combination valve core B, hydraulic cavities Q, valve body 1, constant power valve spring cavity 1a, cutting spool chamber 1b, pressure regulating cavity 1c, drain path 1e, the first spool 2, limit round table 21, the second spool 3, center oilhole 3a, radial direction oil hole 3b, spool left side 31, pressure adjust component 4, adjustment seat 41, little spring 42, big spring 43, left spring seat 44, right spring base 45, screw 46, sealing nut 47, O-ring 5, gasket 6 are adjusted.

The structural schematic diagram of the pressure shut-off valve of the original SA11V series plunger pump pump head valve of Fig. 6.It can from figure Out,

Original cutting valve core is a two section spools, and the hole that spool is correspondingly installed on valve body is also two section steps Hole, which results in the valve chamber processing cost height of conventional pressure stop valve, and functional response is slow, fit clearance is big, and hole is formed with axis Pressure film is unstable, is unevenly distributed, to affect the service life of entire plunger pump.

The utility model such as Fig. 1 to Fig. 5 discloses a kind of pressure cut off valve arrangement for SA11V series plunger pump, should Structure includes the plunger pump head valve valve body 1 for being machined with constant power valve installation cavity and pressure shut-off valve installation cavity, constant power valve peace It behave affectedly by being equipped with the constant power valve core cavity of invariable power spool and being equipped with the constant power valve spring cavity 1a group of constant power valve spring At；Pressure shut-off valve installation cavity includes the pressure for being equipped with the cutting spool chamber 1b of cutting spool and being equipped with pressure adjusting component 4 Power adjusting cavity 1c.The utility model focuses on: cutting spool is to assemble the group constituted by the first spool 2 and the second spool 3 Spool B is closed, using combination valve core B instead of the design structure of traditional two section spools, the second spool 3 is processed by the center of left side There is an axially extending center oilhole 3a, the length of center oilhole 3a is greater than the half of 3 overall length of the second spool, in the second spool 3 Between be machined with radial direction oil hole 3b for being connected to center oilhole 3a；First spool 2 is slidably mounted on the center of the second spool 3 In oilhole 3a, and 2 left end of the first spool forms the limit round table with the limit cooperation of the spool left side 31 of the second spool 3 21.The right side of first spool 2 is located at the left side of radial direction oil hole 3b, is on the right side of 2 right side of the first spool in center oilhole 3a Hole section constitute push the first spool and the second spool relative movement hydraulic cavities Q；It is machined in valve body 1 for being connected to pressure The drain path 1e of adjusting cavity 1c and constant power valve spring cavity 1a.

The cutting spool of the utility model has due to using knockdown design structure, and designing in the second spool 3 Center oilhole 3a and radial direction oil hole 3b, so as to which the pressure oil in 1 oil duct of valve body to be guided to the hydraulic cavities Q of center oilhole 3a, from And the second spool 3 is pushed to move right.In addition, the utility model is also machined with drain path 1e, to solve change spool The problem of oil return of pressure regulating cavity 1c afterwards.

Since first spool 2 of the utility model is slidably mounted in the center oilhole 3a of the second spool 3, cutting Spool chamber 1b is the unthreaded hole of same diameter, does not need independent customized forming cutter, processing technology is simple, to can guarantee the valve opening Cylindricity.

In embodiment, as shown in figure 5, pressure adjusts component 4 by adjustment seat 41, little spring 42, big spring 43, left spring seat 44, right spring base 45, adjusting screw 46 and sealing nut 47 form；Adjustment seat 41 is machined with external screw thread, pressure regulating cavity 1c's It it is machined with internal screw thread, adjustment seat 41 and pressure regulating cavity 1c on inner wall is matched by external screw thread and internal screw thread spiral and be mounted on pressure The accent of power adjusting cavity 1c.Right spring base 45, big spring 43, little spring 42 and left spring seat 44 are sequentially arranged at adjustment seat 41 In spring cavity, the bottom surface of left spring seat 44 is matched with the press of the right end of the second spool 3, and adjustment seat 41 is machined with perforation spring cavity Adjusting threaded hole, adjust screw 46 be threaded through adjust threaded hole be located at spring cavity in right spring base 45 bottom surface Xiang Ding It connects, 47 spiral of sealing nut, which is mounted on, to be adjusted on screw 46 and match with the press of the end face of adjustment seat 41.

In embodiment, little spring 42 is sleeved in big spring 43, and the left end apical grafting of little spring 42 is in left spring seat 44 Small annular end face on, on the small annular end face of the right spring base 45 of the right end apical grafting of the little spring 42, the left end of big spring 43 is pushed up It connects on the big annular end face of left spring seat 44, on the big annular end face of the right spring base 45 of the right end apical grafting of the big spring 43.

In embodiment, it is pressed with the O-ring 5 to seal between adjustment seat 41 and the accent of pressure regulating cavity 1c, seals Nut 47 is pressed with gasket 6.

The most preferred embodiment of the utility model has illustrated, the various change or remodeling made by those of ordinary skill in the art All without departing from the scope of the utility model.

Claims (4)

1. a kind of pressure cut off valve arrangement for SA11V series plunger pump, including it is machined with constant power valve installation cavity and pressure The plunger pump head valve valve body (1) of stop valve installation cavity, the constant power valve installation cavity is by being equipped with the perseverance of invariable power spool Power spool chamber and constant power valve spring cavity (1a) composition for being equipped with constant power valve spring；The pressure shut-off valve installation cavity Including being equipped with the cutting spool chamber (1b) of cutting spool and being equipped with the pressure regulating cavity (1c) of pressure adjusting component (4)；Its Be characterized in: the cutting spool is to assemble the combination valve core (B) constituted by the first spool (2) and the second spool (3), described Second spool (3) is machined with axially extending center oilhole (3a) by the center of left side, the length of the center oilhole (3a) Degree is greater than the half of the second spool (3) overall length, and the middle of second spool (3) is machined with for being connected to center oilhole The radial direction oil hole (3b) of (3a)；First spool (2) is slidably mounted in the center oilhole (3a) of the second spool (3), And the first spool (2) left end forms the limit round table (21) with the limit cooperation of the spool left side (31) of the second spool (3), The right side of first spool (2) is located at the left side of radial direction oil hole (3b), is in first in the center oilhole (3a) Hole section on the right side of spool (2) right side constitutes the hydraulic cavities (Q) for pushing the first spool and the relative movement of the second spool；Described The drain path (1e) for being connected to pressure regulating cavity (1c) and constant power valve spring cavity (1a) is machined in valve body (1).

2. a kind of pressure cut off valve arrangement for SA11V series plunger pump according to claim 1, it is characterized in that: institute The pressure stated adjusts component (4) by adjustment seat (41), little spring (42), big spring (43), left spring seat (44), right spring base (45), screw (46) and sealing nut (47) composition are adjusted；The accent spiral shell of the adjustment seat (41) and pressure regulating cavity (1c) Rotation is mutually equipped with；Right spring base (45), big spring (43), little spring (42) and the left spring seat (44) is sequentially arranged at adjusting In the spring cavity of seat (41), the bottom surface of the left spring seat (44) is matched with the press of the right end of the second spool (3), described Adjustment seat (41) be machined with perforation spring cavity adjusting threaded hole, the adjusting screw (46) be threaded through adjust threaded hole with The bottom surface phase apical grafting of right spring base (45) in spring cavity, the sealing nut (47) spiral are mounted on adjusting screw (46) it is matched on and with the press of the end face of adjustment seat (41).

3. a kind of pressure cut off valve arrangement for SA11V series plunger pump according to claim 2, it is characterized in that: institute The little spring (42) stated is sleeved in big spring (43), and the left end apical grafting of the little spring (42) is in left spring seat (44) Small annular end face on, on the small annular end face of the right spring base of right end apical grafting (45) of the little spring (42), the big spring (43) left end apical grafting is on the big annular end face of left spring seat (44), the right spring base of right end apical grafting (45) of the big spring (43) Big annular end face on.

4. a kind of pressure cut off valve arrangement for SA11V series plunger pump according to claim 2, it is characterized in that: institute The O-ring (5) to seal, the sealing spiral shell are pressed between the adjustment seat (41) stated and the accent of pressure regulating cavity (1c) Female (47) are pressed with gasket (6).