Three-screw pump

Abstract

The invention discloses a three-screw pump, and relates to the technical field of pump bodies, the three-screw pump comprises a three-screw pump main body, the three-screw pump main body comprises a pump shell and a three-screw mechanism arranged in the pump shell, and the pump shell is internally provided with a feeding cavity and a discharging cavity which are communicated with the interior of the pump shell; one end of the backflow channel is communicated with the discharging cavity, and the backflow channel is provided with a flow regulation and control mechanism which is used for regulating and controlling the communication opening degree between the discharging cavity and the backflow channel; a backflow regulation and control mechanism and / or a noise reduction regulation and control mechanism are / is arranged at the other end of the backflow channel; wherein the backflow regulation and control mechanism is used for regulating a communication switch between the backflow channel and the feeding cavity, the noise reduction regulation and control mechanism is used for regulating a communication switch between the backflow channel and the interior of the pump shell, and the noise reduction function and / or the flow regulation function can be achieved through the three-screw pump.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pump body, in particular to a three-screw pump. BACKGROUND

[0002] In the existing three-screw pump product, due to its relatively simple structure, its main function is to quantitatively boost the delivery of fluid, and it cannot bear other additional functions such as flow regulation of the quantitative pump. Meanwhile, if the working condition deviates from the basic operating condition of the product, such as medium containing gas or high suction height, the performance of the product will change, and in severe cases, it cannot meet the user's demand.

[0003] Therefore, when the existing three-screw pump has a large suction height or delivers medium containing a certain amount of gas, the screw pump product is prone to cavitation, and the noise and vibration generated will increase sharply, which seriously affects the performance of the product. Moreover, the three-screw pump is a positive displacement pump, and the delivery flow is fixed. However, in the existing product structure, there is no flow regulation channel inside, so the flow cannot be regulated, and therefore the product cannot meet the demand of some users for flow regulation. SUMMARY

[0004] The purpose of the present application is to provide a three-screw pump that solves the following technical problems:

[0005] How to add noise reduction and flow regulation functions to the three-screw pump.

[0006] The purpose of the present application can be achieved by the following technical solutions:

[0007] A three-screw pump, comprising a three-screw pump body, the three-screw pump body comprising a pump housing and a three-screw mechanism arranged in the pump housing, the pump housing being provided with a feed chamber and a discharge chamber in communication with the pump housing; further comprising a backflow channel, one end of the backflow channel being in communication with the discharge chamber, and a flow regulation mechanism being arranged to regulate the opening degree of the communication between the discharge chamber and the backflow channel; the other end of the backflow channel being provided with a backflow regulation mechanism and / or a noise reduction regulation mechanism;

[0008] The backflow regulation mechanism is used to adjust the communication switch between the backflow channel and the feed chamber, and the noise reduction regulation mechanism is used to adjust the communication switch between the backflow channel and the interior of the pump housing.

[0009] In a further aspect of the present application, the pump housing comprises a pump pipe and a front end cover and a rear end cover connected to both ends of the pump pipe, and the rear end cover is provided with a feed inlet in communication with the pump pipe, and the communication between the feed inlet and the pump pipe forms a feed chamber; the pump pipe is provided with a discharge outlet on the wall of the end close to the front end cover, and the communication between the discharge outlet and the pump pipe forms a discharge chamber.

[0010] In a further aspect of the present application, an axial channel, i.e. a backflow channel, is formed in the side wall of the pump pipe away from the discharge port; one end of the axial channel is in communication with the feeding cavity, and the other end is in communication with the discharge cavity.

[0011] In a further aspect of the present application, a first mounting hole is formed in the wall of the pump pipe and in communication with the discharge cavity and the axial channel; the flow control mechanism is mounted in the first mounting hole to control the opening degree of the communication between the discharge cavity and the axial channel.

[0012] In a further aspect of the present application, the flow control mechanism has a columnar structure as a whole, including a boss at the top end, a groove is formed at the top end of the boss, and a notch corresponding to the axial channel is formed in the side wall of the groove; the flow control mechanism further includes a boss driving mechanism to drive the notch of the boss to approach or move away from the axial channel.

[0013] In a further aspect of the present application, the first mounting hole includes hole a, hole b and hole d from inside to outside, wherein the hole b is in communication with the axial channel, and a slide c parallel to the hole axis is formed in the hole wall of the hole b; the boss is mounted in the hole a, the boss driving mechanism includes a moving column connected to the outer end of the boss, a positioning pin is mounted on the side wall of one end of the moving column close to the boss, the moving column is mounted in the hole b, and the positioning pin is mounted in the slide c; the other end of the moving column is internally provided with an inner hole, and a flow control rod is threadedly connected in the mounting hole.

[0014] In a further aspect of the present application, a second mounting hole is formed in the wall of the pump pipe and in communication with the interior of the pump pipe and the axial channel; the noise reduction control mechanism is mounted in the second mounting hole to control the opening and closing of the communication between the interior of the pump pipe and the axial channel.

[0015] In a further aspect of the present application, the second mounting hole includes hole e in communication with the interior of the pump pipe and the axial channel, hole f coaxially connected with hole e, and hole g from inside to outside; the noise reduction control mechanism has a cylindrical structure as a whole, and a plug is arranged at the top end and filled in the hole e, the outer end of the plug is connected with a noise reduction control rod threadedly connected in the hole f, a noise reduction sealing rod mounted in the hole g and a noise reduction square rod in sequence.

[0016] In a further aspect of the present application, a third mounting hole is formed in the wall of the pump pipe and in communication with the interior of the pump pipe and the feeding cavity; the backflow control mechanism is mounted in the third mounting hole to control the opening and closing of the communication between the feeding cavity and the axial channel.

[0017] In a further aspect of the present application: the third mounting hole position comprises, from inside to outside, a hole position h in communication with the interior of the pump pipe, a hole position i coaxially communicating with the hole position h, and a hole position j; the backflow regulating mechanism is in the shape of a cylinder as a whole, and is provided with a plug filled in the hole position h at the top end, and the outer end of the plug is connected with, in sequence, a backflow regulating rod screwed in the hole position i, a backflow sealing rod mounted in the hole position j, and a backflow square rod.

[0018] The beneficial effects of the present application are:

[0019] The three-screw pump of the present application is provided with a backflow channel, one end of which is in communication with the discharge chamber, and a flow regulating mechanism is arranged to regulate the opening degree of the communication between the discharge chamber and the backflow channel; the other end of the backflow channel is provided with a backflow regulating mechanism and / or a noise reduction regulating mechanism according to actual requirements, the discharge chamber can be communicated with the right end communication port of the axial channel through the flow regulating mechanism, if noise reduction is required, the communication port between the left end of the axial channel and the feed chamber is closed through the backflow regulating mechanism, and the left end of the axial channel is communicated with the interior of the pump pipe through the noise reduction regulating mechanism, so that the medium is backflowed to the pump pipe (the area where the three-screw mechanism is conveyed in the pump body) after entering the backflow channel from the discharge chamber, thereby effectively reducing the noise of the product.

[0020] If flow regulation is required, the left end of the axial channel is closed with the pump pipe through the noise reduction regulating mechanism, the communication port between the left end of the axial channel and the feed chamber is opened through the backflow regulating mechanism, and the opening degree of the communication between the discharge chamber and the axial channel is controlled through the flow regulating mechanism according to requirements, so that a certain amount of medium is backflowed to the feed chamber through the axial channel, thereby effectively regulating the output flow of the discharge chamber. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described below with reference to the accompanying drawings.

[0022] Figure 1 is a structural schematic view of the three-screw pump of embodiment 1 of the present application;

[0023] Figure 2 is a sectional perspective view of the three-screw pump of embodiment 1 of the present application;

[0024] Figure 3 is a sectional view of the pump shell of the three-screw pump of embodiment 1 of the present application;

[0025] Figure 4 is a sectional view of the internal structure of the three-screw pump of embodiment 1 of the present application;

[0026] Figure 5 is a structural schematic view of the flow regulating mechanism of the three-screw pump of embodiment 1 of the present application;

[0027] Figure 6is an exploded view of the flow regulating mechanism in the three-screw pump of embodiment 1 of the present application;

[0028] Figure 7 is a structural schematic view of the noise reduction regulating mechanism in the three-screw pump of embodiment 1 of the present application;

[0029] Figure 8 is a structural schematic view of the backflow regulating mechanism in the three-screw pump of embodiment 1 of the present application;

[0030] Figure 9 is a structural schematic view of embodiment 2 of the present application;

[0031] Figure 10 is a structural schematic view of embodiment 3 of the present application.

[0032] In the figure: 100, pump pipe; 101, discharge port; 102, axial channel; 200, front end cover; 300, rear end cover; 301, feed port; 400, three-screw mechanism; 500, flow regulating mechanism; 501, boss; 502, moving column; 503, flow regulating rod; 504, side cover; 505, flow sealing ring; 506, hexagonal nut; 507, positioning pin; 600, noise reduction regulating mechanism; 601, plug; 602, noise reduction regulating rod; 603, noise reduction sealing rod; 604, noise reduction square rod; 700, backflow regulating mechanism; 701, plug; 702, backflow regulating rod; 703, backflow sealing rod; 704, backflow square rod. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0034] Embodiment 1

[0035] Please refer to Figure 1 The present embodiment discloses a three-screw pump, which comprises a three-screw pump body, the three-screw pump body comprising a pump shell and a three-screw mechanism 400 arranged in the pump shell; the pump shell is provided with a feed cavity (low-pressure cavity) and a discharge cavity (high-pressure cavity) which are in communication with the pump shell; the above structures are all conventional structures of the three-screw pump in the prior art, and the specific structures are not described one by one.

[0036] Please refer to Figure 2Specifically, in the embodiment, the pump housing comprises a pump pipe 100 and a front end cover 200 (left end) and a rear end cover 300 (right end) connected to two ends of the pump pipe 100 respectively, and the upper side of the rear end cover 300 is provided with a feeding port 301 in communication with the pump pipe 100, and the communication part of the feeding port 301 with the pump pipe 100 forms a feeding cavity; the upper side of the pipe wall of the pump pipe 100 close to the front end cover 200 is provided with a discharging port 101, and the communication part of the discharging port 101 with the pump pipe 100 forms a discharging cavity; the driving end of the three-screw mechanism 400 is connected with the front end cover 200, and the main screw structure (one main screw + two auxiliary screws) thereof is located inside the pump pipe 100.

[0037] Based on the structure of the three-screw pump in the prior art, in view of the defects that the flow of the output medium cannot be controlled and the noise is large in the background art, the following improvements are made:

[0038] A reflux channel is additionally provided, one end of the reflux channel is in communication with the discharging cavity, and a flow control mechanism 500 is arranged to control the opening degree of the communication between the discharging cavity and the reflux channel; the other end of the reflux channel is provided with a reflux control mechanism 700 and a noise reduction control mechanism 600; wherein the reflux control mechanism 700 is used to adjust the communication switch between the reflux channel and the feeding cavity, and the noise reduction control mechanism 600 is used to adjust the communication switch between the reflux channel and the inside of the pump housing.

[0039] Please refer to Figure 3 Specifically, in the embodiment, an axial channel 102, i.e. a reflux channel, is arranged inside the pipe wall of the lower side of the pump pipe 100; the left end of the axial channel 102 is in communication with the feeding cavity, and the right end is in communication with the discharging cavity.

[0040] The pipe wall of the lower side of the pump pipe 100 is also provided with a first mounting hole, a second mounting hole and a third mounting hole, the hole axes of the three are perpendicular to the axial direction of the pump pipe 100; wherein:

[0041] The first mounting hole comprises coaxially communicated hole a, hole b and hole d from inside to outside, wherein the hole b is in communication with the right end of the axial channel 102, and a slide c parallel to the hole axis direction is arranged on the hole wall of the hole b;

[0042] The second mounting hole comprises hole e in communication with the inside of the pump pipe 100 and the axial channel 102, hole f coaxially communicated with hole e and hole g from inside to outside;

[0043] The third mounting hole comprises hole h in communication with the axial channel 102 from inside to outside, and the hole h is located inside the axial channel 102 (close to the inside of the pump pipe 100), hole i coaxially communicated with hole h and hole j.

[0044] It should be noted that the hole diameter of the axial passage 102 is d, the hole diameter of the hole site a is d1, the hole diameter of the hole site e is d2, and the hole diameter of the hole site h is d3. The above hole diameters satisfy d2

[0045] Referring to Figure 4 , the flow regulating mechanism 500 is installed in the first mounting hole site to regulate the opening degree of the communication between the discharge cavity and the axial passage 102, specifically the communication between the hole site a and the right end of the axial passage 102; the noise reduction regulating mechanism 600 is installed in the second mounting hole site to regulate the communication switch between the inside of the pump pipe 100 and the axial passage 102, specifically the communication switch between the hole site e and the axial passage 102; the backflow regulating mechanism 700 is installed in the third mounting hole site to regulate the communication switch between the feed cavity and the axial passage 102, specifically the communication switch between the left end of the axial passage 102 and the feed cavity.

[0046] Referring to Figures 4-6, the flow regulating mechanism 500 is in a columnar structure as a whole, comprising a boss 501 at the top end, a groove is formed at the top end of the boss 501, and a notch corresponding to the axial channel 102 is formed on the side wall of the groove; the flow regulating mechanism 500 further comprises a boss driving mechanism for driving the notch of the boss 501 to move towards or away from the axial channel 102, so as to control the size of the alignment opening degree of the notch and the right end of the axial channel 102, and further control the flow of water in the discharge cavity into the axial channel 102; specifically, the boss 501 is installed in the hole position a, and the outer diameter of the boss 501 is the same as the inner diameter of the hole position a, so that the boss 501 can seal and block the hole position a; the boss driving mechanism comprises a moving column 502 connected in sequence with the outer end of the boss 501 (the end close to the outside of the pump pipe 100), the moving column 502 is installed in the hole position b, a positioning pin 507 is installed on the side wall of the end of the moving column 502 close to the boss 501, and the positioning pin 507 is installed in the slide c; so that the moving column can only move in the up-down direction and cannot rotate; a side cover 504 is installed in the hole position d, the side cover 504 is fixedly installed in the hole position d by four sets of locking bolts, and an installation hole is formed in the side cover 504 and communicates with the first installation hole; the outer end of the moving column 502 is provided with an inner hole, the inner hole is provided with an internal thread, and a flow regulating rod 503 is arranged in the inner hole, the upper end of the flow regulating rod 503 is provided with an external thread matched with the internal thread of the inner hole, and is connected with the inner hole by thread connection; the diameter of the middle end is the same as the inner diameter of the installation hole of the side cover 504, and a sealing ring installation position is arranged on the outer wall of the middle end, and a flow sealing ring 505 is arranged on the sealing ring installation position, so that the middle end and the side cover 504 are sealed, and water leakage is avoided; the middle end is provided with an external thread at the lower part, and a matched hexagonal nut 506 is installed; the lower end is in the form of a square rod, so as to facilitate the rotation of the flow regulating rod 503; the distance L1 between the boss 501 and the flow regulating rod 503, the length L2 of the slide c and the length L3 of the boss 501 satisfy the relationship requirement of L1

[0047] In detail, when the flow regulating mechanism 500 is regulated, the hexagonal nut 506 is first removed, the limitation of the flow regulating rod 503 is released, then the square rod at the lower end of the flow regulating rod 503 is rotated, the upper end of the flow regulating rod 503 is driven to rotate in the inner hole of the moving column 502, under the limiting action of the positioning pin 507, the moving column 502 is driven to move up and down, and then the boss 501 is driven to move up / down, so that the notch on the boss 501 communicates / closes with the right end of the axial channel 102, and the flow of the discharge area into the axial channel 102 can be controlled according to the displacement of the boss 501 to control the alignment opening degree of the notch and the axial channel 102, so as to realize the controllable regulation of the flow.

[0048] Please refer to Figure 4 , Figure 7, the noise reduction regulation mechanism 600 is in a cylindrical shape as a whole, a plug 601 is arranged in the top end of the noise reduction regulation mechanism 600 and filled in the hole e, the outer diameter of the plug 601 is the same as the inner diameter of the hole e, so that the plug 601 can seal and block the hole e; the outer end of the plug 601 is connected with a noise reduction regulation rod 602 in the hole f in sequence, the inner wall of the hole f is provided with an internal thread, the outer wall of the noise reduction regulation rod 602 is provided with an external thread matched with the internal thread in the hole f, and the two are threadedly connected; the outer end of the noise reduction regulation rod 602 is connected with a noise reduction sealing rod 603 installed in the hole g, the outer diameter of the noise reduction sealing rod 603 is the same as the inner diameter of the hole g, the outer wall of the noise reduction sealing rod 603 is provided with a sealing ring mounting position, wherein a noise reduction sealing ring is arranged, so that the noise reduction sealing rod 603 and the hole g are sealed, and water leakage is avoided; the outer end of the noise reduction sealing rod 603 is connected with a noise reduction square rod 604, so as to facilitate the rotation of the noise reduction regulation rod 602; at the same time, the hole g is provided with a check ring mounting position, and a check ring arranged outside the noise reduction square rod 604 is installed in the check ring mounting position; the distance L4 between the noise reduction square rod 604 and the check ring, the length L5 of the internal thread in the hole f and the length L6 of the plug 601 meet the relationship requirement of L4

[0049] In detail, when the noise reduction regulation mechanism 600 is regulated, only the noise reduction square rod 604 needs to be rotated to drive the noise reduction regulation rod 602 to rotate, so as to drive the plug 601 to move upward / downward, and then make the plug 601 enter / leave the hole e, so that the axial channel 102 and the inside of the pump pipe 100 are closed / communicated, and the purpose of regulating the communication switch between the inside of the pump pipe 100 and the axial channel 102 can be achieved.

[0050] Please refer to Figure 4 , Figure 8The reflux control mechanism 700 is cylindrical in shape, with a plug 701 at its top that fills the hole h. The outer diameter of the plug 701 is the same as the inner diameter of the hole h, allowing the plug 701 to seal the hole h. The outer end of the plug 701 is connected to a reflux control rod 702 located in the hole i. The inner wall of the hole i has an internal thread, and the outer wall of the reflux control rod 702 has an external thread that matches the internal thread in the hole i, and the two are threaded together. The outer end of the reflux control rod 702 is connected to a reflux sealing rod 703 installed in the hole j. The outer diameter of the reflux sealing rod 703 is the same as the inner diameter of the hole j. The outer wall of the return sealing rod 703 is provided with a sealing ring mounting position, in which a return sealing ring is provided to achieve a seal between the return sealing rod 703 and the hole j, so as to prevent water leakage. The outer end of the return sealing rod 703 is connected to the return square rod 704 to facilitate the rotation of the return regulating rod 702. At the same time, the hole j is provided with a retaining ring mounting position, in which a retaining ring is installed outside the return square rod 704. The distance L7 between the return square rod 704 and the retaining ring 12, the length L8 of the internal thread in the hole i, and the length L9 of the return square rod 704 meet the requirement that L7 < L9 < L8.

[0051] In detail, when adjusting the reflux control mechanism 700, it is only necessary to rotate the reflux square rod 704 to drive the reflux control rod 702 to rotate, thereby causing the plug 701 to move up / down, and thus causing the plug 701 to enter / exit the hole h, so that the axial channel 102 and the feed chamber are closed / connected, thereby achieving the purpose of controlling the connection and switching between the feed chamber and the axial channel 102.

[0052] The working principle of this embodiment: When using the three-screw pump of this embodiment, the flow control mechanism 500 connects the discharge chamber to the right end of the axial channel 102. If noise reduction is required, the reflux control mechanism 700 closes the connection between the left end of the axial channel 102 and the feed chamber, and then opens it. The noise reduction control mechanism 600 connects the left end of the axial channel 102 to the inside of the pump tube 100, allowing the medium to enter the reflux channel 102 through the discharge chamber and then flow back into the pump tube 100 (the three-screw mechanism 400 is located in the pump body). (The internal transmission area) effectively reduces product noise; if flow regulation is required, the left end of the axial channel 102 is sealed to the inside of the pump pipe 100 by the noise reduction regulation mechanism 600, and the connection between the left end of the axial channel 102 and the feed chamber is opened by the return flow regulation mechanism 700. At the same time, the opening of the connection between the discharge chamber and the axial channel is controlled by the flow regulation mechanism 500 as needed, so that a certain amount of medium flows back to the feed chamber through the axial channel 102, thereby effectively regulating the output flow of the discharge chamber.

[0053] Example 2

[0054] Please seeFigure 9 The embodiment discloses a three-screw pump, and the three-screw pump of the embodiment only solves the problem of noise reduction, and therefore the difference from the three-screw pump of the embodiment 1 is only that the third mounting hole position and the backflow control mechanism 700 are not arranged in the three-screw pump of the embodiment, and the left end of the axial channel 102 is not communicated with the feed chamber.

[0055] Embodiment 3

[0056] Please refer to Figure 10 The embodiment discloses a three-screw pump, and the three-screw pump of the embodiment only solves the problem of noise reduction, and therefore the difference from the three-screw pump of the embodiment 1 is only that the third mounting hole position and the backflow control mechanism 700 are not arranged in the three-screw pump of the embodiment, and the left end of the axial channel 102 is not communicated with the feed chamber.

[0057] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation and a particular orientation configuration and operation, therefore, it cannot be understood as a limitation on the present application. In addition, "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0058] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] The above has described one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the implementation of the present application. Any equivalent changes and improvements made within the scope of the present application shall still belong to the patent scope covered by the present application.

Claims

1. A three-screw pump, comprising a three-screw pump body, the three-screw pump body including a pump housing and a three-screw mechanism (400) disposed within the pump housing, wherein the pump housing has an inlet chamber and an outlet chamber communicating with the inside of the pump housing; characterized in that: It also includes a reflux channel, one end of which is connected to the discharge chamber and is provided with a flow control mechanism (500) to control the opening degree of the connection between the discharge chamber and the reflux channel; the other end of the reflux channel is provided with a reflux control mechanism (700) and / or a noise reduction control mechanism (600); The reflux control mechanism (700) is used to adjust the connection switch between the reflux channel and the feed chamber, and the noise reduction control mechanism (600) is used to adjust the connection switch between the reflux channel and the inside of the pump housing.

2. The tri-screw pump of claim 1, wherein, The pump housing includes a pump pipe (100) and a front end cover (200) and a rear end cover (300) respectively connected to both ends of the pump pipe (100). The rear end cover (300) is provided with a feed inlet (301) communicating with the pump pipe (100). The feed inlet (301) and the connection between the feed inlet (301) and the pump pipe (100) form a feed chamber. The pump pipe (100) is provided with a discharge outlet (101) on the pipe wall near the front end cover (200). The discharge outlet (101) and the connection between the discharge outlet (101) and the pump pipe (100) form a discharge chamber.

3. The tri-screw pump of claim 2, wherein, An axial channel (102), i.e. a return channel, is provided in the inner wall of the pump pipe (100) away from the discharge port (101); one end of the axial channel (102) is connected to the feed chamber and the other end is connected to the discharge chamber.

4. The tri-screw pump of claim 3, wherein, The pump pipe (100) has a first mounting hole on its wall that communicates with the discharge chamber and the axial channel (102). The flow control mechanism (500) is installed in the first mounting hole to control the opening degree of communication between the discharge chamber and the axial channel (102).

5. The tri-screw pump of claim 4, wherein, The flow control mechanism (500) is generally columnar in shape, including a boss (501) at the top. The top of the boss (501) has a groove, and the side wall of the groove has a notch corresponding to the axial channel (102). The flow control mechanism (500) also includes a boss driving mechanism to drive the notch of the boss (501) to move closer to or away from the axial channel (102).

6. The tri-screw pump of claim 5, wherein, The first mounting holes, from the inside out, include holes a, b, and d. Hole b is connected to the axial channel (102), and a slide c parallel to the hole axis is provided on the hole wall of hole b. The boss (501) is installed in hole a. The boss driving mechanism includes a moving column (502) connected to the outer end of the boss (501). A positioning pin (507) is installed on the side wall of the moving column (502) near the boss (01). The moving column (502) is installed in hole b, and the positioning pin (507) is installed in slide c. The other end of the moving column (502) has an inner hole, and a flow control rod (503) threaded through the mounting hole is connected in the inner hole.

7. The tri-screw pump of claim 3, wherein, The pump pipe (100) is provided with a second mounting hole position on the pipe wall, which is in communication with the interior of the pump pipe (100) and the axial channel (102), and the noise reduction control mechanism (600) is installed in the second mounting hole position to control the communication switch between the interior of the pump pipe (100) and the axial channel (102).

8. The tri-screw pump of claim 7, wherein, The second mounting hole position comprises a hole position e in communication with the interior of the pump pipe (100) and the axial channel (102), a hole position f coaxially connected with the hole position e, and a hole position g from inside to outside. The noise reduction control mechanism (600) is in the shape of a cylinder as a whole, and is provided with a plug (601) filled in the hole position e at the top end. The outer end of the plug (601) is sequentially connected with a noise reduction control rod (602) screwed in the hole position f, a noise reduction sealing rod (603) installed in the hole position g, and a noise reduction square rod (604).

9. The tri-screw pump of claim 3, wherein, The pump pipe (100) is provided with a third mounting hole position on the pipe wall, which is in communication with the interior of the pump pipe (100) and the feeding cavity, and the backflow control mechanism (700) is installed in the third mounting hole position to control the communication switch between the feeding cavity and the axial channel (102).

10. The tri-screw pump of claim 9, wherein, The third mounting hole position comprises a hole position h in communication with the interior of the pump pipe (100), a hole position i coaxially connected with the hole position h, and a hole position j from inside to outside. The backflow control mechanism (700) is in the shape of a cylinder as a whole, and is provided with a plug (701) filled in the hole position h at the top end. The outer end of the plug (701) is sequentially connected with a backflow control rod (702) screwed in the hole position i, a backflow sealing rod (703) installed in the hole position j, and a backflow square rod (704).

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