CN210977788U - Reciprocating linkage double-cam plunger pump - Google Patents

Reciprocating linkage double-cam plunger pump Download PDF

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Publication number
CN210977788U
CN210977788U CN201922118739.3U CN201922118739U CN210977788U CN 210977788 U CN210977788 U CN 210977788U CN 201922118739 U CN201922118739 U CN 201922118739U CN 210977788 U CN210977788 U CN 210977788U
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plunger
cam
sliding body
plunger end
rod
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CN201922118739.3U
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Chinese (zh)
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陆军
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Shenzhen Yisi Precision Hardware Co ltd
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Shenzhen Yisi Precision Hardware Co ltd
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Abstract

The utility model discloses a reciprocal linkage double cam plunger pump to solve the defect that flow precision is unstable and the spring is fragile under large-traffic plunger pump's the various pressure. The plunger pump comprises a plunger rod (103) and a drive mechanism (200) thereof, wherein the drive mechanism comprises: a base (202); a sliding body (206) which is arranged on the base and can slide along the moving direction of the plunger rod, and an accommodating space (208) is arranged between the proximal plunger end (203) and the distal plunger end (211) of the sliding body; a rotating shaft (205) mounted on the base; a first cam (207) supported in the accommodating space through the rotating shaft and matched with the near plunger end; a second cam (209) supported in the accommodating space by the rotating shaft and matched with the distal plunger end; a connecting rod (201) connecting the slider and the plunger rod; and a motor (212) driving the shaft.

Description

Reciprocating linkage double-cam plunger pump
Technical Field
The utility model relates to a large-traffic plunger pump specifically is a reciprocal linkage double cam plunger pump.
Background
The high-flow high-precision pump is commonly used in the fields of new energy, environmental protection, chemical industry, medicine and the like. Pumps currently on the market for delivering large flows of liquids typically include diaphragm, peristaltic and plunger pumps. The diaphragm pump is corrosion resistant and has large flow, but has the defects of low pressure resistance, low flow precision, large flow pulsation and the like. The peristaltic pump has high flow precision, but has the defects of low pressure resistance, easy damage of a pipeline, narrow corrosion resistance range of a pipeline material and the like. The plunger pump adopts a cam driving lift range and a spring driving return stroke, so the plunger pump is also called as a reciprocating spring plunger cam pump, has the advantages of high withstand voltage, high flow precision, mature control technology and the like, and still has the following defects: 1. because of the limitation of the reciprocating motion frequency of the spring, under the working conditions of large flow and high pressure, the plunger is subjected to the resistance of the sealing ring, the return stroke can not be accurately attached to the cam, and the return stroke liquid inlet flow rate repetition precision is greatly changed under different pressure conditions; 2. the spring is subject to high frequency stress strain and is easily broken.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a reciprocal linkage double cam plunger pump to solve the defect that flow precision is unstable and the spring is fragile under large-traffic plunger pump's the various pressure.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a reciprocating linked double cam plunger pump comprising a plunger rod (103) and a drive mechanism (200) for driving the plunger rod (103) to reciprocate, wherein the drive mechanism (200) comprises:
a base (202);
a sliding body (206) which is arranged on the base (202) and can slide along the movement direction of the plunger rod (103), and an accommodating space (208) is arranged between the proximal plunger end (203) and the distal plunger end (211) of the sliding body (206);
a rotating shaft (205) mounted on the base (202);
a first cam (207) supported in the accommodating space (208) through the rotating shaft (205), matched with the proximal plunger end (203) and used for driving the sliding body (206) to move towards the direction approaching the plunger rod (103);
a second cam (209) supported in the accommodating space (208) through the rotating shaft (205), matched with the distal plunger end (211) and used for driving the sliding body (206) to move in a direction away from the plunger rod (103);
a connecting rod (201) connecting the sliding body (206) and the plunger rod (103); and
a motor (212) driving the rotating shaft (205).
Preferably, the distance between any two points on the rim of the first cam (207) which are centrosymmetric with respect to the axis of the first cam (207) is equal, and the distance between any two points on the rim of the second cam (209) which are centrosymmetric with respect to the axis of the second cam (209) is equal.
Preferably, the proximal plunger end (203) and the distal plunger end (211) are provided with bearings, respectively, through which the first cam (207) and the second cam (209) cooperate with the proximal plunger end (203) and the distal plunger end (211).
Preferably, the sliding body (206) is further provided with a spacing adjustment mechanism (300) for adjusting the radial spacing between the two bearings.
Preferably, the spacing adjustment mechanism (300) includes: a support base (301) slidably mounted on the slider (206) for supporting the bearing; two push rods (303) which are installed on the sliding body (206) and can move along the direction vertical to the sliding direction of the supporting seat (301); two adjusting rods (304) which are correspondingly arranged at the tail ends of the two push rods (303) and are in threaded fit with the sliding body (206); and the conversion inclined planes (302) are arranged at the front ends of the two push rods (303) or the positions, corresponding to the two push rods (303), of the supporting seat (301) and are used for converting the movement of the push rods (303) into the movement of the supporting seat (301), and the directions of the two conversion inclined planes (302) are opposite.
Preferably, the connecting rod (201) is a cylinder, a containing hole matched with the cylinder is formed in the side portion of the base (202), and the connecting rod (201) penetrates through the containing hole to form a piston-like structure.
Preferably, the sliding body (206) is provided with a pulling plate connecting the proximal plunger end (203) and the distal plunger end (211) at the mouth of the receiving space (208) to prevent the distance between the proximal plunger end (203) and the distal plunger end (211) from varying.
Preferably, there are a plurality of plunger rods (103) and the same number of said drive mechanisms (200) as plunger rods (103), all drive mechanisms (200) sharing the same shaft (205) and the same motor (212).
Compared with the prior art, the utility model discloses following beneficial effect has at least:
the utility model discloses a circular motion with the motor of two cams converts the reciprocating linear motion of slider into, and then drives plunger rod reciprocating motion, and the lift and the return stroke of its plunger rod are by cam control, and the precision is not influenced by pressure, has not had fragile return spring moreover, and the life of pump is longer.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a reciprocating linkage double cam plunger pump;
FIG. 2 is a schematic view of the internal structure thereof;
FIG. 3 is a schematic view of the configuration of the sliding body and the arrangement of the two bearings;
FIG. 4 is a schematic view of a spacing adjustment mechanism;
FIG. 5 is a schematic perspective view of a first cam and a second cam in another embodiment, wherein solid lines represent the first cam and dashed lines represent the second cam;
reference numerals:
100. a pump head;
101. a liquid inlet; 102. a pump body; 103. a plunger rod; 104. a tee fitting; 105. a liquid outlet;
200. a drive mechanism;
201. a connecting rod; 202. a base; 203. a proximal plunger end; 204. a first bearing; 205. a rotating shaft; 206. a sliding body; 207. a first cam; 208. an accommodating space; 209. a second cam; 210. a second bearing; 211. a distal plunger end; 212. a motor; 213. a belt; 2111. a first assembly hole; 2112. a second assembly hole;
300. a spacing adjustment mechanism;
301. a supporting seat; 302. converting an inclined plane; 303. a push rod; 304. and adjusting the rod.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Referring to fig. 1 and 2, the reciprocating linked double cam plunger pump includes a pump head 100 and a driving mechanism 200.
The pump head 100 is a double-plunger pump head, and specifically includes two pump chambers 102 and two plunger rods 103, which are arranged side by side, the two pump chambers 102 are connected to the liquid inlet 101 through a three-way member 104, the two pump chambers 102 are connected to the liquid outlet 105 through another three-way member 104, and when the pump head operates, the two plunger rods 103 move, so that the two pump chambers 102 alternately suck liquid from the liquid inlet 101 and output liquid from the liquid outlet 105. It should be pointed out that this kind of double-plunger structure pump head is the prior art that uses widely, the utility model discloses except can being applicable to this kind of double-plunger structure pump head, also be applicable to the pump head of single-plunger structure pump head or more plunger structures.
The drive mechanism 200 is used to drive the plunger rod 103 to reciprocate.
The drive mechanism 200 includes: a base 202; a sliding body 206 which is installed on the base 202 and can slide along the moving direction of the plunger rod 103, and an accommodating space 208 is arranged between the proximal plunger end 203 and the distal plunger end 211 of the sliding body 206; a rotating shaft 205 mounted on the base 202; a first cam 207 supported in the accommodating space 208 by the rotating shaft 205, cooperating with the proximal plunger end 203, for driving the sliding body 206 to move toward the plunger rod 103; a second cam 209 supported in the accommodating space 208 through the rotating shaft 205, cooperating with the distal plunger end 211, for driving the sliding body 206 to move away from the plunger rod 103; a connecting rod 201; and a motor 212 that drives the rotating shaft 205. The pump head 100 is fixed at the end of the base 202 and the plunger rod 103 is connected to the slide 206 by a connecting rod 201. The output shaft of the motor 212 is connected to the rotating shaft 205 through a belt 213.
Further, a first bearing 204 is arranged at the proximal plunger end 203, a second bearing 210 is arranged at the distal plunger end 211, the first cam 207 is matched with the proximal plunger end 203 through the first bearing 204, and the second cam 209 is matched with the distal plunger end 211 through the second bearing 210, so that the contact friction of the cam and the sliding body 206 can be reduced.
The process of the driving mechanism 200 driving the plunger rod 103 to reciprocate is as follows:
the motor 212 rotates the rotating shaft 205, and further, the first cam 207 and the second cam 209 are synchronously rotated.
S1, when the small diameter point of the first cam 207 contacts the first bearing 204, the large diameter point of the second cam 209 contacts the second bearing 210, and the slider 206 is positioned at the farthest end (right end in fig. 2) of the sliding stroke.
S2, as the rotation shaft 205 rotates, the large diameter point of the first cam 207 gradually turns to the first bearing 204, and the small diameter point of the second cam 209 gradually turns to the second bearing 210, so that the movement pushes the sliding body 206 to slide to the left in fig. 2, and further the connecting rod 201 drives the plunger rod 103 to move to the left.
S3, when the large diameter point of the first cam 207 contacts the first bearing 204, the small diameter point of the second cam 209 contacts the second bearing 210, and the slider 206 is located at the most proximal end (left end in fig. 2) of the sliding stroke.
S4, as the rotating shaft 205 further rotates, the large diameter point of the first cam 207 leaves the first bearing 204, the small diameter point gradually turns to the first bearing 204, the small diameter point of the second cam 209 leaves the second bearing 210, and the large diameter point gradually turns to the second bearing 210, and this movement pushes the sliding body 206 to slide to the right in fig. 2, and further drives the plunger rod 103 to move to the right through the connecting rod 201.
The above-described processes S1-S4 are repeated, thereby driving the plunger rod 103 to reciprocate.
The first cam 207 and the second cam 209 are matched with the proximal plunger end 203 and the distal plunger end 211 of the sliding body 206, so that the rotary motion of the motor 212 is converted into the reciprocating linear motion of the sliding body 206, and the plunger rod 103 is driven by the connecting rod 201 to reciprocate linearly. Because the lift and the return stroke of the plunger rod 103 are controlled by the sliding body 206, and the sliding stroke of the sliding body 206 is determined by the first cam 207 and the second cam 209, is fixed and constant and is not influenced by the output fluid pressure and the movement frequency of the pump, the flow rate precision of the plunger pump under various pressures is stable and constant. Meanwhile, the service life of the pump is longer because a vulnerable return spring is not arranged.
The utility model discloses in adopt two cams of first cam 207 and second cam 209 respectively with the nearly plunger end 203 and the distal plunger end 211 cooperation of slider 206, control slider 206 reciprocating linear motion, like this through the relative position who sets up the big footpath point and the path point of two cams, can be so that when the one end contact of the big footpath point of a cam and slider 206, the position (and the non-path point) of the neighbouring path point of another cam and the other end contact of slider 206, be favorable to plunger rod 103 more steady and smooth and easy when the motion reversal like this. Fig. 5 shows a projection of the first cam 207 and the second cam 209 in another embodiment, with which the second cam 209 is in contact with the second bearing 210 at a position adjacent to the small diameter point, rather than the small diameter point, when the large diameter point of the first cam 207 is in contact with the first bearing 204.
Preferably, the distance between any two points on the rim of the first cam 207 that are centrosymmetric with respect to the axial center of the first cam 207 is equal, and the distance between any two points on the rim of the second cam 209 that are centrosymmetric with respect to the axial center of the second cam 209 is equal. In this way, the sliding body 206 is always in contact with both the first cam 207 and the second cam 209 during the whole movement, so that the sliding body does not shake during the whole movement, and the smooth operation of the plunger rod 103 is better ensured.
With further reference to fig. 3 and 4, in order to overcome the influence caused by the production error of the parts, a spacing adjustment mechanism 300 for adjusting the radial spacing d between the first bearing 204 and the second bearing 210 is further provided on the sliding body 206.
In the present embodiment, the spacing adjustment mechanism 300 is provided at the distal plunger end 211 of the slider 206, and the first fitting hole 2111 and the second fitting hole 2112 for mounting the spacing adjustment mechanism 300 are provided at the distal plunger end 211. It should be understood that the spacing adjustment mechanism 300 may also be provided to the proximal plunger end 203 of the slider body 206.
The specific interval adjusting mechanism 300 includes: a supporting seat 301, two push rods 303 and two adjusting rods 304. The bearing block 301 is slidably mounted in the first mounting hole 211 of the slider 206, and the second bearing 210 is supported at the distal plunger end 211 of the slider 206 by the bearing block 301. The two push rods 302 are installed in the second fitting holes 2112 of the slider 206 to be movable in a direction perpendicular to the sliding direction of the support base 301. The two adjusting rods 304 are correspondingly arranged at the tail ends of the two push rods 303 and are in threaded fit with the sliding body 206, so that the push rods 303 can be driven to move up and down when the adjusting rods 304 are rotated. A conversion inclined surface 302 is provided at the front end (lower end in fig. 4) of the push rod 303, and when the push rod 303 moves downward, the conversion inclined surface 303 pushes the support seat 301 to move horizontally, i.e., the conversion inclined surface 303 functions to convert the movement of the push rod 303 into the movement of the support seat 301. The shifting slopes 302 at the front ends of the two push rods 303 are oppositely oriented, so that the supporting seat 301 can be adjusted in the forward and reverse directions for the purpose of adjusting the distance d between the first bearing 204 and the second bearing 210, and the supporting seat 301 can be locked at the adjusted position by the two opposite shifting slopes 302.
With further reference to fig. 2, the connecting rod 201 is a cylinder, the side of the base 202 is provided with a receiving hole matching with the cylinder, and the connecting rod 201 is inserted into the receiving hole to form a piston-like structure (piston-like structure). The design is favorable for the accurate linear reciprocating motion of the connecting rod 201.
Furthermore, a pulling plate for connecting the proximal plunger end 203 and the distal plunger end 211 is installed at a mouth 2081 (see fig. 3) of the accommodating space 208 on the sliding body 206, and the pulling plate connects the free end of the proximal plunger end 203 and the free end of the distal plunger end 211, so that the distance between the proximal plunger end 203 and the distal plunger end 211 can be further prevented from changing after the pump output pressure is too high.
With further reference to fig. 2, in this embodiment there are two plunger rods 103, two said drive mechanisms 200, all drive mechanisms 200 sharing a common shaft 205 and a common motor 212.
The present invention has been described in detail with reference to the specific embodiments, and the detailed description is only for assisting the skilled person in understanding the content of the present invention, and can not be understood as the limitation of the protection scope of the present invention. Various decorations, equivalent changes and the like which are performed on the scheme by the technical personnel in the field under the conception of the invention are all included in the protection scope of the invention.

Claims (8)

1. A reciprocating linked double cam plunger pump comprising a plunger rod (103) and a drive mechanism (200) for driving said plunger rod (103) to reciprocate, characterized in that said drive mechanism (200) comprises:
a base (202);
a sliding body (206) which is arranged on the base (202) and can slide along the movement direction of the plunger rod (103), and an accommodating space (208) is arranged between the proximal plunger end (203) and the distal plunger end (211) of the sliding body (206);
a rotating shaft (205) mounted on the base (202);
a first cam (207) supported in the accommodating space (208) through the rotating shaft (205), matched with the proximal plunger end (203) and used for driving the sliding body (206) to move towards the direction approaching the plunger rod (103);
a second cam (209) supported in the accommodating space (208) through the rotating shaft (205), matched with the distal plunger end (211) and used for driving the sliding body (206) to move in a direction away from the plunger rod (103);
a connecting rod (201) connecting the sliding body (206) and the plunger rod (103); and
a motor (212) driving the rotating shaft (205).
2. A reciprocating-linked double-cam plunger pump according to claim 1, characterized in that any two points on the rim of the first cam (207) which are centrosymmetric with respect to the axial center of the first cam (207) are equally spaced, and any two points on the rim of the second cam (209) which are centrosymmetric with respect to the axial center of the second cam (209) are equally spaced.
3. A reciprocating-linked double cam plunger pump according to claim 1, wherein the proximal plunger end (203) and the distal plunger end (211) are provided with bearings, respectively, through which the first cam (207) and the second cam (209) cooperate with the proximal plunger end (203) and the distal plunger end (211).
4. A pump according to claim 3, wherein the slide (206) is further provided with a spacing adjustment mechanism (300) for adjusting the radial spacing (d) between the two bearings.
5. A reciprocating-linked double cam plunger pump according to claim 4, wherein the spacing adjustment mechanism (300) comprises:
a support base (301) slidably mounted on the slider (206) for supporting the bearing;
two push rods (303) which are installed on the sliding body (206) and can move along the direction vertical to the sliding direction of the supporting seat (301);
two adjusting rods (304) which are correspondingly arranged at the tail ends of the two push rods (303) and are in threaded fit with the sliding body (206); and
the conversion inclined planes (302) are arranged at the front ends of the two push rods (303) or the positions, corresponding to the two push rods (303), of the supporting seat (301) and are used for converting the movement of the push rods (303) into the movement of the supporting seat (301), and the directions of the two conversion inclined planes (302) are opposite.
6. The reciprocating linkage double-cam plunger pump as claimed in claim 1, wherein the connecting rod (201) is a cylinder, a containing hole matched with the cylinder is formed in the side portion of the base (202), and the connecting rod (201) penetrates through the containing hole to form a piston-like structure.
7. A reciprocating-linked double cam plunger pump according to claim 1, characterized in that the slide (206) is fitted with a drawplate at the mouth of the housing space (208) that couples the proximal plunger end (203) and the distal plunger end (211) to prevent the distance between the proximal plunger end (203) and the distal plunger end (211) from varying.
8. A reciprocating-linked double cam plunger pump according to claim 1, characterized by having a plurality of plunger rods (103) and the same number of said drive mechanisms (200) as plunger rods (103), all drive mechanisms (200) sharing the same rotating shaft (205) and the same motor (212).
CN201922118739.3U 2019-11-29 2019-11-29 Reciprocating linkage double-cam plunger pump Active CN210977788U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922118739.3U CN210977788U (en) 2019-11-29 2019-11-29 Reciprocating linkage double-cam plunger pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922118739.3U CN210977788U (en) 2019-11-29 2019-11-29 Reciprocating linkage double-cam plunger pump

Publications (1)

Publication Number Publication Date
CN210977788U true CN210977788U (en) 2020-07-10

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ID=71417879

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201922118739.3U Active CN210977788U (en) 2019-11-29 2019-11-29 Reciprocating linkage double-cam plunger pump

Country Status (1)

Country Link
CN (1) CN210977788U (en)

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