CN218816819U - Plunger pump - Google Patents

Abstract

The utility model discloses a plunger pump, the plunger pump includes the pump head, the pump body and drive assembly, drive assembly includes the driving piece, pump body coupling is between pump head and driving piece, be formed with the installation cavity in the pump body, install the sliding seat in the installation cavity, the one end of sliding seat is connected with the plunger that stretches into to the pump head in, the driving piece is used for driving the sliding seat and goes up and down in the installation cavity, the sliding seat stops to descend when descending to the one end of being close to the driving piece, and be formed with between sliding seat and the driving piece and dodge the clearance, dodge the clearance and effectively avoided sliding seat and driving piece direct contact, and then prevented between sliding seat and the driving piece by the lubricating oil adhesion, the reliability of sliding seat motion has been ensured, the smooth and easy degree of plunger motion has been improved, the plunger pump maintenance cost has been reduced.

Description

Plunger pump

Technical Field

The utility model relates to a plunger pump technical field, in particular to plunger pump.

Background

The plunger pump is applied to hydraulic system and can realize the hydraulic means of imbibition and fluid-pressure, and the plunger pump need add lubricating oil in order to reduce the friction in the pump at the operation in-process, improves the comfortable degree of motion of plunger pump, however in the longer back of plunger pump live time, lubricating oil adhesion transmission structure in the pump body, and then cause plunger motion jamming, influence the normal work of plunger pump, and the lubricating oil clearance degree of difficulty is big, and it is inconvenient and the maintenance cost is high to maintain.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a plunger pump aims at solving the problem that lubricating oil easily adheres to transmission structure in the plunger pump.

In order to achieve the above object, the utility model provides a plunger pump, plunger pump includes:

a pump head;

a drive assembly including a drive member;

the pump body, the pump body connect in the pump head with between the driving piece, be formed with the installation cavity in the pump body, install the sliding seat in the installation cavity, the one end of sliding seat be connected with stretch into to plunger in the pump head, the driving piece is used for the drive the sliding seat is in go up and down in the installation cavity, the sliding seat descends to being close to during the one end of driving piece, the sliding seat with be formed with between the driving piece and dodge the clearance.

Optionally, the driving assembly further includes a driving rod connected to the driving member, an installation channel is opened at one end of the sliding seat facing the driving member, the driving rod extends into the installation channel, and the driving member is configured to drive the sliding seat to ascend and descend along the driving rod.

Optionally, the end of the transmission rod far away from the driving part is provided with a protrusion, and when the sliding seat descends to be close to one end of the driving part, the protrusion is in contact with the top wall of the installation channel.

Optionally, the transmission rod is provided with an external thread, an internal thread matched with the external thread is arranged on the inner wall of the installation channel, and the driving piece drives the sliding seat to lift in the installation cavity through the transmission rod.

Optionally, a guide groove is formed in the bottom of the installation channel, and the driving piece is used for driving the sliding seat to ascend and descend along the transmission rod, so that the protrusion extends into the guide groove or is separated from the guide groove.

Optionally, the protrusion is hemispherical or conical, and the guide groove matches the shape of the protrusion.

Optionally, the surface area of the projection is greater than the surface area of the guide groove wall.

Optionally, a limiting part is arranged at the bottom of the pump body, and when the sliding seat descends to a position close to one end of the driving part, the sliding seat contacts with the limiting part, so that an avoiding gap is formed between the sliding seat and the driving part.

Optionally, the locating part is a limiting ring, a locating step is arranged on the driving part, the limiting ring is arranged outside the locating step in a surrounding mode, the inner diameter of the limiting ring is smaller than the outer diameter of the sliding seat, and the height of the limiting ring is larger than that of the locating step.

Optionally, the limiting member is a protrusion disposed at the bottom of the pump body.

Optionally, an exhaust hole communicating the installation cavity with the installation channel is formed in the sliding seat.

The technical scheme of the utility model, the plunger pump is when the operation, the driving piece is used for driving the sliding seat and goes up and down in the installation cavity, so that the sliding seat drives plunger reciprocating motion and then realizes imbibition and fluid pressing, and, the sliding seat can rise to the position that is close to the pump head or descend to the position that is close to the driving piece in the installation cavity, when the sliding seat descends to spacing down in the installation cavity, be formed with between sliding seat and the driving piece and dodge the clearance, the sliding seat stops descending when descending to the one end that is close to the driving piece promptly, and the clearance of dodging that forms between sliding seat and the driving piece has effectively avoided sliding seat and driving piece direct contact, and then prevented between sliding seat and the driving piece by the lubricating oil adhesion, the reliability of sliding seat motion has been ensured, the smooth and easy degree of plunger motion has been improved, the plunger pump maintenance cost has been reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic view of an assembly structure of a plunger pump according to an embodiment of the present invention;

fig. 2 is an exploded schematic view of a plunger pump according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a sliding seat of a plunger pump according to an embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of the sliding seat of the plunger pump in another position according to an embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of a plunger pump according to an embodiment of the present invention;

fig. 6 is a schematic cross-sectional view of a plunger pump according to another view angle of the present invention;

fig. 7 is a schematic structural view of a support ring, a seal ring and a seal ring in a plunger pump according to an embodiment of the present invention;

fig. 8 is a schematic cross-sectional view of a plunger pump according to another embodiment of the present invention.

The reference numbers illustrate:

the realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.

Detailed Description

The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that all directional indicators (such as upper, lower, left, right, front and rear \8230;) in the present embodiment are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the figure), and if the specific posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions in the present application as to "first," "second," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "secured" are to be construed broadly, and thus, for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The present invention is described in the directions of "up", "down", "front", "back", "left", "right", etc. with reference to the direction shown in fig. 1, and is only used to explain the relative positional relationship between the components in the posture shown in fig. 1, and if the specific posture is changed, the directional indication is also changed accordingly.

The utility model provides a plunger pump.

As shown in fig. 1 to 4, the plunger pump 100 of the present embodiment includes a pump head 10, a pump body 30 and a driving assembly 20, wherein the driving assembly 20 includes a driving member 21; the pump body 30 is connected between the pump head 10 and the driving member 21, a mounting cavity 31 is formed in the pump body 30, a sliding seat 40 is installed in the mounting cavity 31, one end of the sliding seat 40 is connected with a plunger 41 extending into the pump head 10, the driving member 21 is used for driving the sliding seat 40 to ascend and descend in the mounting cavity 31, and when the sliding seat 40 descends to one end close to the driving member 21, an avoiding gap 50 is formed between the sliding seat 40 and the driving member 21.

In this embodiment, two ends of the pump body 30 are respectively connected to the pump head 10 and the driving member 21, a mounting cavity 31 for accommodating the sliding seat 40 is formed in the pump body 30, the plunger 41 is connected to one end of the sliding seat 40 facing the pump head 10 and extends into the pump head 10, and one end of the sliding seat 40 facing away from the pump head 10 is connected to the driving member 21. When the plunger pump 100 is in operation, the driving part 21 is used for driving the sliding seat 40 to lift in the installation cavity 31, so that the sliding seat 40 drives the plunger 41 to reciprocate to achieve liquid suction and liquid pressing, and the sliding seat 40 can rise to a position close to the pump head 10 or fall to a position close to the driving part 21 in the installation cavity 31, when the sliding seat 40 falls to a lower limit position in the installation cavity 31, an avoidance gap 50 is formed between the sliding seat 40 and the driving part 21, namely the sliding seat 40 stops falling when falling to one end close to the driving part 21, and the avoidance gap 50 formed between the sliding seat 40 and the driving part 21 effectively avoids the direct contact between the sliding seat 40 and the driving part 21, thereby preventing the adhesion between the sliding seat 40 and the driving part 21 by lubricating oil, ensuring the reliability of the movement of the sliding seat 40, improving the smoothness of the movement of the plunger 41, and reducing the maintenance cost of the plunger pump 100.

In this embodiment, as shown in fig. 1 to 5, the driving assembly 20 further includes a transmission rod 22 connected to the driving member 21, an installation channel 42 is opened at an end of the sliding seat 40 facing the driving member 21, the transmission rod 22 extends into the installation channel 42, and the driving member 21 is configured to drive the sliding seat 40 to move up and down along the transmission rod 22.

In an embodiment, the end of the transmission rod 22 remote from the driver 21 is provided with a projection 221. The transmission rod 22 is connected to the driving part 21 and extends into the installation cavity 31 from the driving part 21, one end of the sliding seat 40 facing the driving part 21 is provided with an installation channel 42, and the installation channel 42 is used for the transmission rod 22 and the protrusion 221 to extend into; when the driving member 21 drives the sliding seat 40 to descend relative to the transmission rod 22, the protrusion 221 abuts against the top wall of the installation channel 42; the avoidance gap 50 is formed between the sliding seat 40 and the driving part 21, so that the sliding seat 40 is effectively prevented from being in direct contact with the driving part 21, the sliding seat 40 is prevented from being adhered to the driving part 21 by lubricating oil, the movement reliability of the sliding seat 40 is ensured, the movement smoothness of the plunger 41 is improved, and the maintenance cost of the plunger pump 100 is reduced. Meanwhile, when the transmission rod 22 is in transmission connection with the mounting channel 42, lubricating oil is usually arranged at the connection part for lubrication, if the lubricating oil is too much, the adhesion between one end of the transmission rod 22 away from the driving part 21 and the top of the mounting channel 42 can be caused, and the contact area between one end of the transmission rod 22 away from the driving part 21 and the top wall of the mounting channel 42 is reduced by arranging the protrusion 221 on the transmission rod 22, so that the adhesion between the transmission rod 22 and the mounting channel 42 by the lubricating oil is prevented, and the abrasion of the top wall of the mounting channel 42 is also reduced.

In this embodiment, an external thread is disposed outside the transmission rod 22, an internal thread matched with the external thread is disposed on a hole wall of the installation channel 42, and the driving member 21 is configured to drive the transmission rod 22 to rotate, so that the transmission rod 22 drives the sliding seat 40 to ascend and descend. As shown in fig. 1 to 5, the transmission rod 22 extends into the installation channel 42 and is in threaded fit with the installation channel 42, the driving member 21 is connected with the transmission rod 22 and can drive the transmission rod 22 to rotate, the transmission rod 22 rotates to drive the sliding seat 40 sleeved outside the transmission rod 22 to ascend and descend relative to the transmission rod 22, so that the sliding seat 40 drives the plunger 41 to reciprocate, the sliding seat 40 drives the guide groove 43 to be close to or far from the protrusion 221, and the protrusion 221 is matched with the groove wall of the guide groove 43 to guide the movement of the sliding seat 40, thereby improving the movement smoothness of the sliding seat 40; moreover, the transmission rod 22 can adopt a screw rod in the prior art, and has the advantages of convenient assembly and reliable structure transmission.

In this embodiment, one end of the sliding seat 40 facing the driving element 21 is provided with a guiding slot 43 communicating with the installation channel 42, and the driving element 21 is configured to drive the sliding seat 40 to move up and down along the transmission rod 22, so that the protrusion 221 extends into the guiding slot 43 or is separated from the guiding slot 43. Specifically, the transmission rod 22 is connected to the driving member 21 and extends from the driving member 21 into the mounting cavity 31, one end of the sliding seat 40 facing the driving member 21 is provided with a mounting channel 42, one end of the mounting channel 42 is used for the transmission rod 22 to extend into, and the other end of the mounting channel 42 is provided with a guide groove 43 for the protrusion 221 to extend into.

As shown in fig. 1 to 5, when the driving member 21 drives the sliding seat 40 to descend relative to the transmission rod 22, the guide slot 43 moves toward the protrusion 221 so that the protrusion 221 extends into the guide slot 43; when the driving member 21 drives the sliding seat 40 to ascend relative to the transmission rod 22, the groove wall of the guiding groove 43 can slide upwards along the outer edge of the protrusion 221, that is, the protrusion 221 and the groove wall of the guiding groove 43 cooperate to guide the sliding seat 40 to ascend, thereby effectively preventing the sliding seat 40 from moving and being stuck, facilitating the plunger 41 to return and improving the stability of the structure.

In this embodiment, as shown in fig. 1 to 5, the protrusion 221 is formed by protruding upward from the transmission rod 22, the protrusion 221 is hemispherical or conical, and the shape of the guide groove 43 matches with that of the protrusion 221, so that the protrusion 221 can cooperate with the groove wall of the guide groove 43 to play a role of guiding the sliding seat 40 to move up and down, the driving element 21 can drive the sliding seat 40 to move, the jamming of the transmission rod 22 caused by the adhesion of the lubricating oil is effectively avoided, and the structure is stable and reliable. In addition, the surface area of the protrusion 221 is larger than the surface area of the groove wall of the guide groove 43, when the driving element 21 drives the sliding seat 40 to descend relative to the transmission rod 22, the guide groove 43 moves towards the direction close to the protrusion 221 so that the protrusion 221 can partially extend into the guide groove 43, that is, when the sliding seat 40 descends to the lower limit position in the installation cavity 31, one part of the protrusion 221 is located in the guide groove 43, and the other part of the protrusion 221 is located outside the guide groove 43, so that when the sliding seat 40 ascends relative to the transmission rod 22, the groove wall of the guide groove 43 can slide upwards along the outer edge of the protrusion 221, that is, the protrusion 221 and the groove wall of the guide groove 43 are matched to play a role in guiding the sliding seat 40 to ascend, and the contact of the protrusion 221 with the groove wall of the guide groove 43 is favorable for pushing the groove wall of the guide groove 43 to move towards the direction far from the protrusion 221, so that the sliding seat 40 is effectively prevented from moving and clamping stagnation, so that the plunger 41 returns, the stability of the structure is improved, and the structural design is reasonable.

In an embodiment, a limiting member is disposed at the bottom of the pump body 30 for limiting the sliding seat 40 to form an avoiding gap 50 with the driving member 21; specifically, when the sliding seat 40 descends to a position close to one end of the driving member 21, the sliding seat 40 contacts with the limiting member, so that an avoidance gap 50 is formed between the sliding seat 40 and the driving member 21.

In this embodiment, as shown in fig. 8, a limiting ring 23 is formed in the pump body 30 in a protruding manner, a positioning step 51 is formed on the driving element 21, the limiting ring 23 is disposed around the positioning step 51, an inner diameter of the limiting ring 23 is smaller than an outer diameter of the sliding seat 40, and a height of the limiting ring 23 is greater than a height of the positioning step 51. As shown in fig. 4, an annular limiting ring 23 protrudes from the pump body 30 into the mounting cavity 31, a positioning step 51 protrudes from the driving member 21 into the mounting cavity 31, the pump body 30 is mounted on the driving member 21 so that the limiting ring 23 surrounds the positioning step 51, the height of the limiting ring 23 is h1, the inner diameter of the limiting ring 23 is d1, the height of the positioning step 51 is h2, and the outer diameter of the sliding seat 40 is d2, wherein h1> h2, and d1< d 2. When the sliding seat 40 descends relative to the driving rod 22, the limiting ring 23 is abutted against the lower end of the sliding seat 40 to limit the sliding seat 40, so as to prevent the sliding seat 40 from directly contacting the driving member 21, thereby preventing the sliding seat 40 from being adhered to the driving member 21 by the lubricant oil, ensuring the reliability of the movement of the sliding seat 40, improving the smoothness of the movement of the plunger 41, reducing the maintenance cost of the plunger pump 100, and the positioning step 51 plays a role of positioning and mounting the limiting ring 23, thereby facilitating and facilitating the assembly. It can be understood that the limiting member is a bump or the like disposed at the bottom of the pump body 30, as long as the limiting member can limit the sliding seat 40, so that when the sliding seat 40 descends to an end close to the driving member 21, an avoiding gap 50 is formed between the sliding seat 40 and the driving member 21.

In an embodiment, the driving member 21 is a motor, and the output shaft of the motor is the transmission rod 22, that is, the output shaft of the motor is externally provided with an external thread, and is in threaded connection with the installation channel 42 of the sliding seat 40 through the output shaft of the motor, so that the output shaft of the motor can drive the sliding seat 40 to ascend and descend relative to the output shaft of the motor when rotating, and the assembly method has the advantages of omitting an assembly step and saving assembly errors. In another embodiment, the transmission rod 22 is sleeved outside the output shaft of the motor and connected to the output shaft of the motor, the transmission rod 22 extends into the installation channel 42 and is in threaded connection with the installation channel 42, so that the output shaft of the motor can drive the transmission rod 22 to rotate, the transmission rod 22 drives the sliding seat 40 to ascend and descend relative to the transmission rod 22, and the transmission rod 22 has the advantages of being convenient to manufacture and assemble and fast.

In the plunger pump 100 of the present embodiment, the slide holder 40 is provided with the air vent hole 44 for communicating the mounting cavity 31 and the mounting passage 42. As shown in fig. 1 to 5, the sliding seat 40 is provided with an exhaust hole 44 penetrating through the sliding seat 40, the exhaust hole 44 is used for communicating the installation channel 42 with the installation cavity 31, so that when the sliding seat 40 descends relative to the transmission rod 22, air in the installation channel 42 can be exhausted out of the installation channel 42 through the exhaust hole 44, so that the protrusion 221 extends into the guide groove 43, the phenomenon that the pressure in the installation channel 42 is too high and the air cannot be exhausted is effectively prevented, the normal return of the plunger 41 is ensured, and the structural design is reasonable.

In this embodiment, the sliding seat 40 is provided with a sliding groove 45 whose extending direction is the same as that of the sliding seat 40, the pump body 30 is provided with a sliding block 34 on one side facing the installation cavity 31, and the sliding block 34 is in sliding contact with the sliding groove 45. As shown in fig. 5 and 6, the sliding groove 45 is disposed outside the sliding seat 40, an extending direction of the sliding groove 45 is the same as a moving direction of the sliding seat 40, a sliding block 34 is embedded in a position of the pump body 30 corresponding to the sliding groove 45, and one end of the sliding block 34 away from the pump body 30 extends into the sliding groove 45 and can slide back and forth relative to the sliding groove 45. When the driving part 21 drives the sliding seat 40 to ascend and descend, the sliding seat 40 drives the sliding groove 45 to move, so that the sliding block 34 slides in the sliding groove 45 in a reciprocating mode along the extending direction of the sliding groove 45, the sliding groove 45 is matched with the sliding block 34 to play a role in guiding the sliding seat 40 to move, the sliding seat 40 is effectively prevented from rotating, and the normal operation of the plunger pump 100 is ensured.

Further, the slider 34 includes a mounting tube 341 and a ball 342, the mounting tube 341 is embedded on the pump body 30, and the ball 342 is mounted at one end of the mounting tube 341 and is in rolling contact with a groove wall of the sliding groove 45. As shown in fig. 5 and fig. 6, the mounting cylinder 341 is embedded on the pump body 30 toward one side of the mounting cavity 31, the ball 342 is mounted at one end of the mounting cylinder 341 close to the sliding slot 45, and the ball 342 can rotate in the mounting cylinder 341, so that the ball 342 extends into the sliding slot 45 and can roll relative to the wall of the sliding slot 45, the ball 342 not only increases the contact area with the wall of the sliding slot 45, further eliminates the revolving gap of the sliding seat 40, improves the moving stability of the sliding seat 40, but also can roll along the wall of the sliding slot 45, further improves the moving smoothness of the sliding seat 40, and improves the guiding reliability; moreover, the sliding block 34 can adopt a ball plunger in the prior art, and the ball of the ball plunger extends into the sliding groove 45 and is in rolling contact with the groove wall of the sliding groove 45, so that the ball plunger has the advantages of easily obtaining materials and saving the manufacturing cost. In addition, in a preferred embodiment, the sliding groove 45 is a V-shaped groove or a U-shaped groove, and the V-shaped or U-shaped sliding groove 45 further increases the contact area between the groove wall of the sliding groove 45 and the ball 342, effectively eliminates the rotation gap of the sliding seat 40, and improves the precision of the plunger pump 100.

In this embodiment, the plunger pump 100 further includes a support ring 60, the support ring 60 is sleeved outside the plunger 41, a first mounting step 32 is formed in the pump body 30, a first limiting step 11 is formed in the pump head 10, and the support ring 60 is mounted between the first mounting step 32 and the first limiting step 11. In addition, a sealing ring 70 is further sleeved outside the plunger 41, a second mounting step 61 is formed on the support ring 60, a second limiting step 12 is formed in the pump head 10, and the sealing ring 70 is mounted between the second mounting step 61 and the second limiting step 12. In addition, a third mounting step 71 is formed on the sealing ring 70, a sealing ring 80 is sleeved on the third mounting step 71, and the sealing ring 80 is abutted against the second limiting step 12.

As shown in fig. 3 to 7, a first mounting step 32 is disposed in the pump body 30 at a position close to the pump head 10, a support ring 60 is mounted on the first mounting step 32, and the support ring 60 is sleeved outside the plunger 41 to function as a position-limiting plunger 41, so that the movement stability of the plunger 41 is improved, and a first position-limiting step 11 is disposed in the pump head 10 corresponding to the support ring 60, so that the first position-limiting step 11 and the first mounting step 32 cooperate to function as a position-limiting mounting of the support ring 60, and the structure is stable and reliable; in addition, a second mounting step 61 is arranged on one side of the support ring 60 facing the pump head 10, a sealing ring 70 is arranged on the second mounting step 61, the sealing ring 70 is sleeved outside the plunger 41 to achieve a sealing effect, and a second limiting step 12 is arranged in the pump head 10 corresponding to the sealing ring 70, so that the second limiting step 12 and the second mounting step 61 are matched to achieve the effect of positioning and mounting the sealing ring 70, the plunger 41 is tightly attached to the sealing ring 70, the offset friction between the plunger 41 and the sealing ring 70 is prevented, and the service life of the sealing ring 70 is prolonged; in addition, a third mounting step 71 is formed on one side, facing the second limiting step 12, of the sealing ring 70, a sealing ring 80 is mounted on the third mounting step 71, and the sealing ring 80 is clamped between the sealing ring 70 and the second limiting step 12, so that the structural sealing performance is further improved.

In the plunger pump 100 of the present embodiment, the pump body 30 is formed with a first stopping step 33, and the pump head 10 is formed with a second stopping step 13 that is engaged with the first stopping step 33. As shown in fig. 3 to 5, a first stopping step 33 is formed at one side of the periphery of the pump body 30 facing the pump head 10, the first stopping step 33 is formed by sinking downward from the pump body 30, a second stopping step 13 is formed at a position of the periphery of the pump head 10 corresponding to the first stopping step 33, and the second stopping step 13 protrudes downward from the pump head 10 to be matched with the first stopping step 33 to play a role in positioning and installing the pump head 10 and the pump body 30. In addition, the pump body 30 is externally connected with a bracket 90, and the bracket 90 is used for being connected with an external structure to play a role in fixedly mounting the plunger pump 100, so that the structure is stable and reliable.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims (11)

1. A plunger pump, characterized in that the plunger pump comprises:

a pump head;

a drive assembly including a drive member;

the pump body, the pump body connect in the pump head with between the driving piece, be formed with the installation cavity in the pump body, install the sliding seat in the installation cavity, the one end of sliding seat is connected with and stretches into extremely plunger in the pump head, the driving piece is used for the drive the sliding seat is in go up and down in the installation cavity, the sliding seat descends to being close to during the one end of driving piece, the sliding seat with be formed with between the driving piece and dodge the clearance.

2. The plunger pump of claim 1, wherein said driving assembly further comprises a driving rod connected to said driving member, an installation channel is opened at an end of said sliding seat facing said driving member, said driving rod extends into said installation channel, and said driving member is used for driving said sliding seat to move up and down along said driving rod.

3. A plunger pump as claimed in claim 2, characterised in that the end of the drive rod remote from the drive member is provided with a projection which contacts the top wall of the mounting channel when the slide shoe is lowered to close one end of the drive member.

4. The plunger pump as claimed in claim 3, wherein said transmission rod is provided with an external thread, and an internal thread matching said external thread is provided on the inner wall of said mounting passage, and said driving member drives said sliding seat to move up and down in said mounting chamber via said transmission rod.

5. The plunger pump of claim 3, wherein the bottom of the mounting channel is provided with a guide slot, and the driving member is used for driving the sliding seat to move up and down along the transmission rod, so that the protrusion extends into the guide slot or is separated from the guide slot.

6. The plunger pump of claim 5 wherein said projection is hemispherical or conical and said guide slot matches the shape of said projection.

7. The plunger pump of claim 6, wherein the surface area of said projection is greater than the surface area of said groove wall of said guide groove.

8. The plunger pump according to claim 2, wherein a stopper is provided at a bottom of the pump body, and when the sliding seat is lowered to a position near an end of the driving member, the sliding seat contacts the stopper, so that an escape gap is formed between the sliding seat and the driving member.

9. The plunger pump according to claim 8, wherein the retainer is a retaining ring, the driving member is provided with a retaining step, the retaining ring is disposed around the retaining step, the inner diameter of the retaining ring is smaller than the outer diameter of the sliding seat, and the height of the retaining ring is greater than the height of the retaining step.

10. The plunger pump of claim 8, wherein said retainer is a projection disposed on the bottom of said pump body.

11. A plunger pump according to any of claims 2-10, characterised in that the sliding block is provided with a venting hole communicating the mounting chamber with the mounting channel.

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