Double-suction double-row positive displacement rotor pump
By designing a double suction and double row volume rotor pump, the pump body structure arranged symmetrically on the left and right and symmetrically and the rotor swaying motion installed by the eccentric sleeve, combined with the design of sealed rubber discs and compensation inner sleeves, the problems of leakage and pulsation of existing water pumps under high pressure conditions are solved, achieving efficient sealing, stable water absorption and drainage and significant boosting effects.
Patent Information
- Application Number
- CN202510311541.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2025-05-13
AI Technical Summary
Existing slanted volume water pumps are prone to leakage problems under high pressure conditions, and have complex structures and high manufacturing costs, pulsation in the water flow, poor stability, and affect the boosting effect.
A double suction and double row volume rotor pump is designed, adopting a pump body structure arranged symmetrically on the left and right. Each pump body is equipped with a C-shaped working chamber and a rotor. The eccentric sleeve and the rotor installed eccentricly are eccentric to perform eccentric movement under the driving of the spindle. Combined with the design of the sealed rubber disc and the compensation inner sleeve, it achieves efficient sealing and stable water absorption and drainage.
It achieves good sealing effect, high working efficiency, long service life under high pressure conditions, eliminates water flow pulsation, good stability, significant boosting effect, and can realize high-pressure self-priming and long-distance conveying water and gas mixture.
Smart Images
Figure CN119982507A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a water pump, in particular to a double-suction double-discharge positive displacement rotor pump. Background Art
[0002] As we all know, the eccentric positive displacement rotor pump is also called the eccentric pump. It includes a stationary pump body and a moving rotor. The rotor is driven by the power input from the main shaft to make it eccentric. The internal volume of the pump chamber is changed through the eccentric action. The energy is directly applied to the liquid in the form of static pressure on the side of the rotor in contact with the liquid, and the liquid is discharged by the squeezing effect of the rotor when it swings. At the same time, space is left on the other side to form a low pressure, which continuously sucks the liquid into the pump body.
[0003] CN206439178U discloses an eccentric displacement high-pressure water pump, comprising a pump body and a rotor installed in the pump body through an eccentric shaft, wherein water inlet and outlet holes are arranged on the pump body, the outer edge of the rotor is tangent to the inner wall of the working chamber of the pump body, side plates are symmetrically arranged on both sides of the rotor on the eccentric shaft, and end covers are respectively arranged on both sides of the pump body, one end of the eccentric shaft is led out from one end cover and connected to a power source, a sliding pair and a rotating pair are arranged between the upper end of the outer edge of the rotor and the inner wall of the pump body, so that the rotor can perform eccentric motion in the working chamber under the drive of the eccentric shaft; an oil filling hole is radially arranged in the middle of the upper end of the pump body, and a lubricating oil channel connected to the oil filling hole is arranged on the sliding pair and the rotating pair.
[0004] This eccentric water pump can effectively improve the efficiency of the water pump, achieve full lubrication of the sliding pair and the rotating pair, achieve good lubrication effect, reduce mechanical wear and prolong service life. However, there are the following problems when it works:
[0005] 1. Oil-water separation is achieved by combining an O-ring between the outer end face of the side plate and the pump body end cover and a mechanical seal between the pump body end cover and the eccentric shaft. However, leakage is prone to occur under high-pressure conditions, which not only reduces pump efficiency but also shortens the service life of the bearings.
[0006] 2. By providing interconnected sliding pairs and rotating pairs between the upper end of the rotor outer edge and the inner wall of the pump body, the rotor is driven by the eccentric shaft to perform eccentric motion in the working chamber, and the single working chamber is divided into a high-pressure area and a low-pressure area by the sliding pairs and the rotor; not only is the structure complex, the manufacturing cost is high, and it is not easy to install; but the discharged water flow is pulsating and has poor stability, which can easily cause continuous impact on the inside and outside of the pump body, causing pump body failure and affecting the boosting effect. Summary of the invention
[0007] The technical problem to be solved by the present invention is to provide a double-suction double-displacement positive displacement rotor pump with good sealing effect, high working efficiency, long service life, ability to eliminate pulsation and good pressurizing effect.
[0008] In order to achieve the above object, the present invention adopts the following technical solutions:
[0009] A double-suction double-displacement positive displacement rotor pump, comprising a pump body, in which a main shaft and a rotor are installed, characterized in that: the pump bodies are two and are symmetrically arranged and connected to each other, each pump body is composed of a main body located on the outside and a pump cover located on the inside of the main body, a water inlet hole and a drain hole are symmetrically arranged on the upper part of each pump body, a C-shaped working chamber is respectively arranged in the main body of each pump body, and the two ends of the circumference of the working chamber are respectively communicated with the water inlet hole and the drain hole, the rotors are eccentrically installed on the main shaft through eccentric sleeves and bearings, and the eccentric directions of the two rotors are opposite, and the C-shaped sleeves on each rotor are respectively inserted into the corresponding working chamber, so that the rotor can perform reciprocating oscillating motion in the working chamber under the drive of the main shaft; rotor glands are respectively connected to the outer ends of the rotors;
[0010] Compensation inner sleeves are vulcanized on the inner ring outer wall and the outer ring inner wall of the C-shaped working chamber of each main body. When the rotor moves, the inner and outer edges of the C-shaped sleeve are respectively interference-fitted with the compensation inner sleeve in the working chamber and have an inner tangent point and an outer tangent point, so that when the rotor deflects in the working chamber, it can alternately realize suction and drainage through the inner and outer chambers of the C-shaped sleeve, so as to improve the supercharging effect;
[0011] A limiting sleeve is fixed in the pump cover, and the inner edge of the limiting sleeve is provided with plum blossom-shaped internal teeth. A limiting plate is fixed on the outer edge of the rotor, and the limiting plate is provided with plum blossom-shaped external teeth that eccentrically mesh with the internal teeth to achieve reciprocating yaw limit of the rotor.
[0012] Sealing rubber discs are respectively arranged between the two ends of each pump body and the rotor and the rotor gland. The sealing rubber discs are provided with a plurality of circles of rubber sealing ribs with corrugated cross sections for sealing each working chamber.
[0013] As a further preference, the rotor is an integrated structure formed by connecting a disc, a center sleeve arranged at the center of the disc, and the C-shaped sleeve arranged at one side of the disc.
[0014] As a further preference, C-shaped wear-resistant pads are fixed to the bottom of the working cavity of the main body, and the outer end of the C-shaped sleeve rests on the wear-resistant pad to prevent the C-shaped sleeve from being worn when the rotor runs.
[0015] As a further preference, a double-ring wear-resistant ring is fixed on the main body of each pump body at the entrance of the working chamber, the C-shaped sleeve of the rotor passes through the C-shaped ring groove on the double-ring wear-resistant ring, and the rotor disc and the limit plate rest on the outer end surface of the double-ring wear-resistant ring to prevent the rotor from wearing against the pump body during operation.
[0016] As a further preference, deep groove ball bearings are respectively provided at both ends of the eccentric sleeve on the main shaft to prevent the eccentric sleeve from axial movement during operation.
[0017] As a further preference, a bearing end cover is fixed to the outside of the main body of each pump body, the inner end of the bearing end cover is pressed against the outer edge of the corresponding sealing rubber disk, and the main shaft is installed between the two bearing end covers through the bearing.
[0018] As a further preference, rubber glands are fixed on opposite sides of the pump covers of the two pump bodies, the inner ends of the rubber glands are pressed against the outer edges of the corresponding sealing rubber discs, and the middle part of the main shaft is supported between the two rubber glands by bearings to improve the stability of the structure.
[0019] As a further preference, the inner edge of the sealing rubber disc is clamped on the rotor or the rotor gland via two clamping rings to prevent the sealing rubber disc from axial movement during operation.
[0020] As a further preference, a water inlet groove and a drainage groove are symmetrically provided at the upper end of the main body of each pump body and sealed by an upper cover plate, one end of the circumference of the working chamber is connected to the water inlet hole through the water inlet groove, and the other end is connected to the drainage hole through the drainage groove, so as to realize centralized water inlet and water outlet.
[0021] As a further preference, a water inlet seat is provided on the outside of the main body of one of the pump bodies at a position corresponding to the water inlet hole, and the water inlet seat is connected to the water inlet hole for connecting an external water inlet pipe; a drain outlet vertically connected to the drain hole is provided on the upper part of the main body of the other pump body, and a one-way valve seat and a water outlet seat are fixed in sequence at the outer end of the drain outlet, and a one-way valve is provided in the one-way valve seat to facilitate centralized water inlet and outlet.
[0022] As a further preference, a plurality of lubrication columns made of self-lubricating material are evenly distributed and embedded on the circumference of the outer end of the C-shaped sleeve to improve the lubrication effect when the rotor is running.
[0023] The beneficial effects of the present invention are:
[0024] 1. Since sealing rubber discs are respectively arranged between the two ends of each pump body and the rotor and the rotor gland, and multiple circles of rubber sealing ribs with corrugated cross-section are arranged on the sealing rubber discs, when the eccentric sleeve drives the rotor to perform eccentric motion in the working chamber, the sealing rubber discs can deform along with the rotor and always wrap around the outer periphery of the rotor. Therefore, when the rotor oscillates, each working chamber can be well sealed to achieve oil-water separation, and leakage problems can be avoided under high-pressure conditions, which can not only improve the pump efficiency, but also increase the service life of the bearings on the main shaft.
[0025] 2. Since the pump body consists of two parts which are symmetrically arranged and connected to each other, water inlet holes and drainage holes are symmetrically arranged on the upper part of each pump body. The two ends of the working chamber in each pump body are respectively connected to the water inlet hole and the drainage hole. The eccentric sleeve drives the rotor to perform eccentric motion in the working chamber to generate self-priming force, and the water is distributed to the two pump bodies by self-priming, which effectively increases the self-priming efficiency and the load capacity of the pump.
[0026] 3. Since a C-shaped working chamber is provided in the main body of each pump body, and the C-shaped sleeve on each rotor is inserted into the corresponding working chamber, the rotor can make a reciprocating oscillating motion in the working chamber under the drive of the main shaft; through the interference fit between the C-shaped sleeve and the compensating inner sleeve embedded in the working chamber, the water flow can be continuously sucked into the working chamber between the inner and outer chambers of the C-shaped sleeve and discharged, so that for every rotation of the main shaft, the inner and outer chambers of the C-shaped sleeve of each rotor can complete secondary water absorption and secondary drainage, and four times of water absorption and four times of drainage can be completed through the rotation of the two rotors, further improving the working efficiency; at the same time, the plum blossom-shaped outer teeth arranged on the limit plate are eccentrically meshed with the plum blossom-shaped inner teeth on the inner edge of the limit sleeve, thereby changing the single-point hinged limit adopted by the existing oscillating pump, solving many problems such as the fragility and limitation of the limit structure, and having a simple structure, easy installation and low manufacturing cost.
[0027] 4. Since the rotors are eccentrically mounted on the main shaft through eccentric sleeves and bearings respectively and the eccentric directions of the two rotors are opposite, the rotors in the two pump bodies alternately complete the suction and drainage operations during operation, eliminating pulsation, having good stability, and being able to avoid continuous impact of water flow pulsation on the inside and outside of the pump body and causing pump body failure, with good pressurization effect; it can achieve high-pressure self-priming, with the maximum pressure reaching 12Mpa; the maximum vertical suction range can reach 8 meters; the horizontal suction range can reach 100 meters; it can realize long-distance transportation of a mixed medium of water and gas, and there is no cavitation phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a schematic diagram of the structure of the present invention;
[0029] Figure 2 yes Figure 1 Left view of .
[0030] Figure 3 It is a three-dimensional structural diagram of the present invention.
[0031] Figure 4 yes Figure 2 AA section view.
[0032] Figure 5 yes Figure 4 BB cross-sectional view.
[0033] Figure 6 yes Figure 4 CC cross-sectional view.
[0034] Figure 7 yes Figure 4 DD cross-sectional view.
[0035] Figure 8 yes Figure 1 EE cross-sectional view.
[0036] In the figure: pump cover 1, main body 2, rotor 3, needle bearing 4, eccentric sleeve 5, deep groove ball bearing 6, rotor pressure cover 7, bearing 8, main shaft 9, bearing pressure cover 10, retaining ring 11, sealing rubber disc 12, bearing end cover 13, double-ring wear-resistant ring 14, limit plate 15, limit sleeve 16, rubber pressure cover 17, water inlet seat 18, deep groove ball bearing 19, lubrication column 20, wear-resistant pad 21, water inlet hole 22, upper cover plate 23, drain hole 24, one-way valve seat 25, one-way valve 26, water outlet seat 27, compensation inner sleeve 28. DETAILED DESCRIPTION
[0037] like Figure 1-Figure 8 As shown, the present invention relates to a double-suction double-displacement positive displacement rotor pump, including a pump body, in which a main shaft 9 and a rotor 3 are installed. The pump bodies are two and are symmetrically arranged and connected to each other by multiple long bolts. Each pump body is connected by a main body 2 located on the outside and a pump cover 1 located on the inside of the main body 2. The opposite surfaces of the main body 2 and the pump cover 1 are plugged into each other through a stopper to facilitate positioning.
[0038] A water inlet hole 22 and a drain hole 24 are symmetrically arranged on the upper part of each pump body. The water inlet holes 22 and the drain holes 24 on the two pump bodies are arranged in parallel with the main shaft 9 and are connected to each other. A C-shaped working chamber 201 is respectively arranged in the main body 2 of each pump body. The entrance of the working chamber 201 is located at the inner end of the main body 2 and the two ends of the circumference of the working chamber 201 are respectively connected to the water inlet hole 22 and the drain hole 24. The rotor 3 is eccentrically installed on the main shaft 9 through an eccentric sleeve 5 and a needle bearing 4 sleeved on the eccentric sleeve 5, and the eccentric directions of the two rotors 3 are opposite. The outer ends of the rotor 3 are fixedly connected with a rotor gland 7 through screws evenly distributed around the circumference; deep groove ball bearings 6 are respectively installed in the rotor gland 7 at both ends of the eccentric sleeve 5 on the main shaft 9 and in the rotor 3 to prevent the eccentric sleeve 5 from axial movement during operation. The eccentric sleeve 5 is connected to the main shaft 9 by a key.
[0039] Compensating inner sleeves 28 are vulcanized on the inner ring outer wall and the outer ring inner wall of the C-shaped working chamber 201 of each main body 2. The compensating inner sleeves 28 are made of high molecular weight polyethylene material and are used to enhance the sealing effect between the rotor and the working chamber 201, thereby improving the supercharging effect.
[0040] The rotor 3 is an aluminum alloy integral structure formed by connecting a disc, a center sleeve arranged at the center of the disc and a C-shaped sleeve arranged at one side of the disc, and the C-shaped sleeve is arranged concentrically with the center sleeve. The C-shaped sleeve on each rotor 3 is respectively inserted into the corresponding working chamber 201, so that the rotor 3 can perform reciprocating oscillation in the working chamber 201 under the drive of the main shaft 9; when the rotor 3 moves, the inner and outer edges of its C-shaped sleeve are respectively interference-fitted with the compensating inner sleeve 28 in the working chamber 201 and have an inner tangent point and an outer tangent point, and the inner and outer tangent points are colinear with the axis of the main shaft 9 and the eccentric sleeve 5, so that when the rotor 3 oscillates in the working chamber 201, it can alternately realize suction and drainage through the inner and outer cavities of the C-shaped sleeve, thereby improving the pump efficiency.
[0041] A limiting sleeve 16 is embedded and fixed in the pump cover 1, and a plum blossom-shaped internal tooth 161 is provided on the inner edge of the limiting sleeve 16. The disc of the rotor 3 is located in the corresponding pump cover 1, and a limiting disc 15 is sleeved on the outer edge of the disc of the rotor 3 and fixed by screws. The limiting disc 15 is provided with a plum blossom-shaped external tooth 151 and eccentrically meshed with the internal tooth 161, so as to realize the reciprocating yaw limit of the rotor 3.
[0042] A C-shaped wear-resistant pad 21 is fixed to the bottom of the working chamber 201 of the main body 2 by screws, and the outer end of the C-shaped sleeve rests on the wear-resistant pad 21 to prevent the C-shaped sleeve from being worn when the rotor 3 is running. A plurality of lubricating columns 20 made of self-lubricating material are evenly arranged on the circumference of the outer end of the C-shaped sleeve to improve the lubrication effect of the rotor 3 when it is running.
[0043] On the main body 2 of each pump body, a double-circle wear-resistant ring 14 is fixed by screws at the entrance of the working chamber 201. The double-circle wear-resistant ring 14 has a C-shaped ring groove and is opposite to the C-shaped working chamber 201. The C-shaped sleeve of the rotor 3 passes through the C-shaped ring groove on the double-circle wear-resistant ring 14. The disc of the rotor 3 and the limit plate 15 lean against the outer end surface of the double-circle wear-resistant ring 14 to prevent the rotor 3 from wearing the pump body during operation. The wear-resistant pad 21 and the double-circle wear-resistant ring 14 are made of wear-resistant material and are preferably Nitronic 60.
[0044] Sealing rubber discs 12 are respectively arranged between the two ends of each pump body, i.e., the outer ports of the pump cover 1 and the main body 2 and the corresponding rotor 3 and the rotor gland 7. The sealing rubber discs 12 are provided with multiple turns of rubber sealing ribs with corrugated cross sections for sealing each working chamber 201. The inner edges of the sealing rubber discs 12 are clamped on the rotor 3 or the rotor gland 7 through two clamping rings 11 using external clamping springs to prevent the sealing rubber discs 12 from axial movement during operation.
[0045] A bearing end cover 13 is fixed to the outside of the main body 2 of each pump body, and the inner end of the bearing end cover 13 is pressed on the outer edge of the corresponding sealing rubber disc 12. The main shaft 9 is installed between the two bearing end covers 13 through the cylindrical roller bearing 8. A bearing pressure cover 10 is fixed to the outer end of the bearing end cover 13 by screws, and one end of the main shaft 9 passes through the corresponding bearing end cover 13 and the bearing pressure cover 10 for connecting to an external power source.
[0046] Rubber glands 17 are fixed to the opposite sides of the pump covers 1 of the two pump bodies by screws. The inner ends of the rubber glands 17 are pressed against the outer edges of the corresponding sealing rubber discs 12. The middle of the main shaft 9 is supported between the two rubber glands 17 by deep groove ball bearings 19 to improve the stability of the structure.
[0047] A water inlet groove 202 and a water discharge groove 203 are symmetrically provided at the upper end of the main body 2 of each pump body and sealed by an upper cover plate 23 fixed on the upper end of the main body 2. One end of the circumference of the working chamber 201 is connected with the water inlet hole 22 through the water inlet groove 202, and the other end is connected with the water discharge hole 24 through the water discharge groove 203, so as to realize centralized water inlet and water discharge.
[0048] A water inlet seat 18 is provided on the outer side of the main body 2 of one of the pump bodies at a position corresponding to the water inlet hole 22. The water inlet seat 18 is connected to the water inlet hole 22 and is used to connect an external water inlet pipe. A drain port 204 vertically connected to the drain hole 24 is provided on the upper part of the main body 2 of the other pump body. A one-way valve seat 25 and a water outlet seat 27 are fixed in sequence at the outer end of the drain port 204. A one-way valve 26 is provided in the one-way valve seat 25 to facilitate centralized water inlet and outlet.
[0049] During operation, the main shaft 9 is driven to rotate by a power source connected to the main shaft 9. After the main shaft 9 rotates, the two rotors 3 are driven by the eccentric sleeve 5 to perform eccentric motion in the corresponding working chamber 201. Through the cooperation of the C-shaped sleeve and the working chamber 201, water can be alternately sucked into the working chamber 201 between the inner and outer chambers of the C-shaped sleeve through the water inlet hole 22 and gathered to the drain port through the drain hole 24 and discharged through the one-way valve; every time the main shaft 9 rotates one circle, secondary water absorption and secondary water discharge can be completed through the inner and outer chambers of the C-shaped sleeve of each rotor 3, and four times of water absorption and four times of water discharge can be completed through the rotation of the two rotors 3; because the eccentric directions of the two rotors 3 are opposite, the phase angles of the rotors 3 in the two pump bodies when performing eccentric motion during operation differ by 180 degrees, so the rotors 3 in the two pump bodies will alternately complete the suction and drainage operations, eliminating pulsation and having good stability.
[0050] In addition, when the rotor 3 performs oscillating motion in the working chamber 201, the sealing rubber disc 12 can deform along with the rotor 3 and always wrap around the outer periphery of the rotor 3. Therefore, when the rotor 3 oscillates, each working chamber 201 can be well sealed to achieve oil-water separation, and leakage problems can be avoided under high-pressure conditions, which can not only improve the pump efficiency, but also increase the service life of the bearings on the main shaft 9.
[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A double-suction double-displacement positive displacement rotor pump, comprising a pump body, in which a main shaft and a rotor are mounted, characterized in that: The pump bodies are two and are symmetrically arranged and connected to each other. Each pump body is composed of a main body located on the outside and a pump cover located on the inside of the main body. A water inlet hole and a drain hole are symmetrically arranged on the upper part of each pump body. A C-shaped working chamber is arranged in the main body of each pump body. The two ends of the circumference of the working chamber are respectively connected to the water inlet hole and the drain hole. The rotors are eccentrically installed on the main shaft through eccentric sleeves and bearings, and the eccentric directions of the two rotors are opposite. The C-shaped sleeves on each rotor are respectively inserted into the corresponding working chamber, so that the rotor can perform reciprocating oscillation in the working chamber under the drive of the main shaft; rotor glands are respectively connected to the outer ends of the rotors; Compensation inner sleeves are vulcanized on the inner ring outer wall and the outer ring inner wall of the C-shaped working chamber of each main body, respectively, to improve the supercharging effect; when the rotor moves, the inner and outer edges of the C-shaped sleeve are respectively interference-fitted with the compensation inner sleeve in the working chamber and have an inner tangent point and an outer tangent point, so that when the rotor deflects in the working chamber, it can alternately realize suction and drainage through the inner and outer chambers of the C-shaped sleeve; A limiting sleeve is fixed in the pump cover, and the inner edge of the limiting sleeve is provided with plum blossom-shaped internal teeth. A limiting plate is fixed on the outer edge of the rotor, and the limiting plate is provided with plum blossom-shaped external teeth that eccentrically mesh with the internal teeth to achieve reciprocating yaw limit of the rotor. Sealing rubber discs are respectively arranged between the two ends of each pump body and the rotor and the rotor gland. The sealing rubber discs are provided with a plurality of circles of rubber sealing ribs with corrugated cross sections for sealing each working chamber.
2. A double-suction double-displacement positive displacement rotor pump according to claim 1, characterized in that: The rotor is an integrated structure formed by connecting a disc, a center sleeve arranged at the center of the disc and the C-shaped sleeve arranged at one side of the disc.
3. A double-suction double-displacement positive displacement rotor pump according to claim 2, characterized in that: C-shaped wear-resistant pads are fixed at the bottom of the working cavity of the main body, and the outer end of the C-shaped sleeve rests on the wear-resistant pad to prevent the C-shaped sleeve from being worn when the rotor is running.
4. A double-suction double-displacement positive displacement rotor pump according to claim 2 or 3, characterized in that: A double-ring wear-resistant ring is fixed on the main body of each pump body at the entrance of the working chamber. The C-shaped sleeve of the rotor passes through the C-shaped ring groove on the double-ring wear-resistant ring. The rotor disc and the limit plate rest on the outer end surface of the double-ring wear-resistant ring to prevent the rotor from wearing against the pump body during operation.
5. A double-suction double-displacement positive displacement rotor pump according to claim 1, characterized in that: Deep groove ball bearings are respectively arranged at both ends of the eccentric sleeve on the main shaft to prevent the eccentric sleeve from axial movement during operation.
6. A double-suction double-displacement positive displacement rotor pump according to claim 1, characterized in that: A bearing end cover is fixed on the outside of the main body of each pump body, and the inner end of the bearing end cover is pressed on the outer edge of the corresponding sealing rubber disc. The main shaft is installed between the two bearing end covers through the bearing.
7. A double-suction double-displacement positive displacement rotor pump according to claim 6, characterized in that: The opposite sides of the pump covers of the two pump bodies are respectively fixed with rubber glands, the inner ends of the rubber glands are pressed on the outer edges of the corresponding sealing rubber discs, and the middle part of the main shaft is supported between the two rubber glands through bearings to improve the stability of the structure.
8. A double-suction double-displacement positive displacement rotor pump according to claim 1 or 7, characterized in that: The inner edge of the sealing rubber disc is clamped on the rotor or the rotor gland through two clamping rings to prevent the sealing rubber disc from axial movement during operation.
9. A double-suction double-displacement positive displacement rotor pump according to claim 1, characterized in that: A water inlet groove and a water discharge groove are symmetrically provided at the upper end of the main body of each pump body and sealed by an upper cover plate. One end of the circumference of the working chamber is connected to the water inlet hole through the water inlet groove, and the other end is connected to the water discharge hole through the water discharge groove, so as to realize centralized water inlet and water discharge.
10. A double-suction double-displacement positive displacement rotor pump according to claim 9, characterized in that: A water inlet seat is provided on the outer side of the main body of one of the pump bodies at a position corresponding to the water inlet hole, and the water inlet seat is connected to the water inlet hole for connecting an external water inlet pipe; a drain port vertically connected to the drain hole is provided on the upper part of the main body of the other pump body, a one-way valve seat and a water outlet seat are fixed in sequence at the outer end of the drain port, and a one-way valve is provided in the one-way valve seat to facilitate centralized water inlet and outlet.