Cooling structure for bearing seat of steam turbine

Abstract

The invention belongs to the technical field of steam turbine cooling equipment, and discloses a steam turbine bearing seat cooling structure which comprises a bearing seat and further comprises a cooling cavity arranged in the bearing seat; the liquid tank is provided with a liquid cavity for containing cooling liquid; the push plate is arranged in the liquid tank; the output end of the reciprocating transmission part is connected with the push plate, and the reciprocating transmission part is used for driving the push plate to transversely reciprocate in the liquid cavity; two ends of the circulating reciprocating flow channel are respectively communicated with the liquid cavity and the cooling cavity; and along with the movement of the push plate in the liquid box along the direction close to / away from the circulating reciprocating flow channel, the cooling liquid is introduced into the cooling cavity / pumped out of the cooling cavity. Through the cooling cavity, the liquid tank, the push plate, the reciprocating transmission piece and the circulating reciprocating runner, cooling liquid is introduced into the cooling cavity through the first pipeline and the second pipeline in the reciprocating movement process of the push plate, efficient circulation of the cooling liquid between the liquid cavity and the cooling cavity is achieved, a large amount of heat generated by friction of the bearing pedestal is taken away, the temperature of the bearing pedestal is effectively reduced, and the service life of the bearing pedestal is prolonged. And stable operation of mechanical equipment is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam turbine cooling equipment, and specifically relates to a cooling structure for a steam turbine bearing housing. Background Art

[0002] During the operation of a steam turbine, the bearing housing, as a key component for supporting and fixing the bearings, will generate a large amount of heat due to friction during operation. If the bearing housing cannot be cooled in a timely and effective manner, the excessive temperature will not only accelerate the wear of the bearings, reduce their service life, but also may lead to a decrease in bearing accuracy, thereby affecting the normal operation of the entire mechanical equipment.

[0003] For traditional bearing housing cooling methods, such as air cooling, they are greatly affected by environmental factors. When in a high-temperature environment, the temperature of the air itself is relatively high, and the heat dissipation capacity is greatly reduced, making it unable to effectively carry away the heat generated by the bearing housing; while in a high-humidity environment, the water vapor in the air will hinder the heat transfer, further weakening the effect of air cooling, and it is difficult to meet the requirements for stable operation of the machinery.

[0004] Therefore, a cooling structure for a steam turbine bearing housing is proposed to solve the above problems. Summary of the Invention

[0005] To solve the problems raised in the above background art, the present invention provides a cooling structure for a steam turbine bearing housing.

[0006] To achieve the above object, the present invention provides the following technical solution: A cooling structure for a steam turbine bearing housing, including a bearing housing, and further including: A cooling cavity, provided inside the bearing housing; A liquid tank, having a liquid cavity for containing a coolant; A push plate, provided inside the liquid tank; A reciprocating transmission member, the output end of which is connected to the push plate and is used to drive the push plate to reciprocate horizontally inside the liquid cavity; A circulating flow channel, the two ends of which are respectively connected to the liquid cavity and the cooling cavity; As the push plate moves inside the liquid tank in the direction close to / away from the circulating flow channel, coolant is introduced into the cooling cavity / coolant in the cooling cavity is extracted.

[0007] In the above technical solution, preferably, it further includes: A spraying member, the spraying end of which faces the outer surface of the bearing housing; A motion conversion mechanism, connected to the output end of the reciprocating transmission member; The spraying member is provided on the motion conversion mechanism; As the reciprocating transmission member reciprocates horizontally, it drives the motion conversion mechanism to drive the spraying member to rotate circumferentially around the axis of the bearing housing.

[0008] In the above technical solution, preferably, it further includes a housing sleeved outside the bearing seat. There is an accommodation area between the housing and the bearing seat. An arc-shaped groove communicating with the accommodation area is provided on the housing. The spraying member is slidably arranged in the arc-shaped groove and the accommodation area. A sealing cover plate covering the arc-shaped groove is arranged on the outer side of the spraying member.

[0009] In the above technical solution, preferably, it further includes: An air inlet pipe, communicating with the housing to guide the outside air flow to the accommodation area; An air outlet pipe, communicating with the housing to export the air flow in the accommodation area; A liquid guide pipe, communicating with the horizontal low-level area of the accommodation area.

[0010] In the above technical solution, preferably, the motion conversion mechanism includes: A toothed plate, connected to the output end of the reciprocating transmission member; A rotating ring, rotatably arranged on the surface of the bearing seat; A transmission gear, arranged on the rotating ring and meshing with the toothed plate; The spraying member is arranged on the rotating ring.

[0011] In the above technical solution, preferably, the spraying member includes: A middle rotating ring, arranged on the surface of the bearing seat and coaxially arranged with the bearing seat; An accommodation cavity for accommodating the coolant is arranged inside the middle rotating ring; A one-way guiding flow channel, with both ends respectively communicating with the accommodation cavity and the liquid cavity, Moving along the transverse direction in the liquid cavity close to the one-way guiding flow channel with the push plate, the coolant is introduced into the accommodation cavity; A mist output rod, connected to the motion conversion mechanism and communicating with the accommodation cavity through a hose.

[0012] In the above technical solution, preferably, the circulating reciprocating flow channel includes a first pipeline and a second pipeline. The push plate divides the liquid cavity into a first cavity and a second cavity. The first pipeline and the second pipeline are respectively communicated with the first cavity and the second cavity; Moving reciprocally along the transverse direction in the first cavity / second cavity with the push plate, the coolant is introduced into the cooling cavity through the first pipeline / second pipeline.

[0013] In the above technical solution, preferably, it further includes refrigerating sheets arranged in the first cavity and the second cavity for refrigerating the coolant.

[0014] In the above technical solution, preferably, the one-way guiding flow channel includes a first conduit, a second conduit and a third conduit. One ends of the first conduit and the second conduit are communicated with the third conduit. The other ends of the first conduit and the second conduit are respectively communicated with the first cavity and the second cavity. The other end of the third conduit is communicated with the accommodation cavity.

[0015] In the above technical solution, preferably, the reciprocating transmission member includes a motor and a reciprocating transmission screw rod. The output end of the motor is connected to the reciprocating transmission screw rod. A moving block is drivingly arranged on the reciprocating transmission screw rod. A push rod is arranged on the moving block, one end of which penetrates through the liquid tank and is connected to the push plate. The moving direction of the push rod driven by the reciprocating transmission screw rod is the same as the penetrating direction of the push rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the cooling cavity, the liquid tank, the push plate, the reciprocating transmission member and the circulating flow channel, during the reciprocating movement of the push plate, the coolant is circulated into the cooling cavity through the first pipeline and the second pipeline, realizing the efficient circulation of the coolant between the liquid cavity and the cooling cavity, taking away a large amount of heat generated by friction of the bearing seat, improving the cooling efficiency, effectively reducing the temperature of the bearing seat, and ensuring the stable operation of the mechanical equipment.

[0017] Further cooperating with the spraying member, the motion conversion mechanism and the one-way diversion flow channel, when the reciprocating transmission member works, the push plate can be driven to move synchronously so that the coolant enters the accommodating cavity and then is sprayed out through the mist output rod, and the spraying member can be driven to rotate to spray the bearing seat. Without an external transmission source, the continuous supply of the coolant is realized and the spraying coverage range is expanded, further strengthening the heat dissipation effect and making up for the deficiency of simple internal cooling.

[0018] Moreover, through the cooperative design of the housing, the arc-shaped groove, the sealing cover plate, the air inlet pipe and the air outlet pipe, it is ensured that when the spraying member continuously sprays in the accommodating area, the coolant is prevented from splashing and spreading to the external environment, and the air flow circulation in the accommodating area is realized, accelerating the heat dissipation, improving the cooling efficiency, and the waste liquid generated after cooling in the accommodating area can be discharged in time through the liquid guide pipe. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a three-dimensional structural diagram of the bearing seat, the liquid tank and the spraying member of the present invention; Figure 3 It is a three-dimensional structural diagram of the spraying member and the housing of the present invention; Figure 4 It is a partially sectional three-dimensional structural diagram of the rotating ring, the rotating ring, the mist output rod and the accommodating area of the present invention; Figure 5 It is a three-dimensional sectional structural diagram of the liquid cavity and the push plate of the present invention; Figure 6 It is a three-dimensional structural diagram of the push plate and the push rod of the present invention; Figure 7 It is a three-dimensional structural diagram of the toothed plate, the push rod, the moving block and the reciprocating transmission screw rod of the present invention; Figure 8 It is a schematic diagram of the three-dimensional cross-sectional structure of the bearing seat of the present invention.

[0020] In the figure: 1. bearing seat; 2. cooling chamber; 3. liquid tank; 4. liquid chamber; 41. first chamber; 42. second chamber; 5. push plate; 6. reciprocating transmission member; 61. motor; 62. reciprocating transmission screw; 63. moving block; 64. pushing rod; 7. circulating reciprocating flow channel; 71. first pipeline; 72. second pipeline; 8. spray member; 81. transfer ring; 82. accommodating chamber; 83. one-way flow channel; 831. first conduit; 832. second conduit; 833. third conduit; 84. mist output rod; 85. hose; 9. motion conversion mechanism; 91. tooth plate; 92. rotating ring; 93. transmission gear; 10. cover; 11. accommodating area; 12. arc groove; 13. sealing cover plate; 14. air inlet pipe; 15. air outlet pipe; 16. liquid guide pipe; 17. cooling plate. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] like Figure 1 、 Figure 5 、 Figure 8 As shown, the present invention provides a steam turbine bearing seat cooling structure, comprising a bearing seat 1, and further comprising: A cooling chamber 2 is provided in the bearing seat 1; The liquid tank 3 has a liquid cavity 4 for containing a coolant, wherein the coolant is water; Push plate 5, arranged in the liquid tank 3; The reciprocating transmission member 6 has an output end connected to the push plate 5 and is used to drive the push plate 5 to move back and forth in the liquid chamber 4 in the horizontal direction; The reciprocating flow channel 7 has two ends connected to the liquid chamber 4 and the cooling chamber 2 respectively; As the push plate 5 moves in the liquid tank 3 in a direction approaching or moving away from the reciprocating flow channel 7 , the coolant is introduced into the cooling chamber 2 or the coolant in the cooling chamber 2 is extracted.

[0023] The above-mentioned reciprocating movement can pass the coolant in the liquid tank 3 into the cooling chamber 2 while extracting the coolant after absorbing heat, thereby realizing the circulation of the coolant. Compared with the static cooling method, this circulating cooling method can take away the heat generated by the bearing seat more quickly, improve the cooling efficiency, and ensure that the bearing seat remains within the appropriate temperature range during operation.

[0024] Although the above-mentioned circulating water path can ensure the circulation and cooling of the coolant inside the bearing seat, there are limitations in cooling the outer surface of the bearing seat. Therefore, the following solution is designed based on this part: As Figure 1 , Figure 2 shown, it further includes: A spray member 8 with the spray end facing the outer surface of the bearing seat 1; A motion conversion mechanism 9 connected to the output end of the reciprocating transmission member 6; The spray member 8 is arranged on the motion conversion mechanism 9; Driven by the reciprocating movement of the reciprocating transmission member 6 along the horizontal direction, the motion conversion mechanism 9 drives the spray member 8 to rotate circumferentially around the axis line of the bearing seat 1 in a reciprocating manner.

[0025] The circumferential reciprocating rotational movement of the spray member 8 can spray the coolant on the outer surface of the bearing seat 1 in multiple ranges. This spraying method has a wide coverage range, continuously provides cooling for the surface to take away heat, and does not require an additional transmission source. The reciprocating movement of the reciprocating transmission member 6 is used to synchronously realize the spraying rotational movement, which mainly solves the technical problems of cooling coverage range and uniformity.

[0026] As Figure 1 , Figure 4 shown, it further includes a housing 10 sleeved outside the bearing seat 1. There is an accommodation area 11 between the housing 10 and the bearing seat 1. The housing 10 is provided with an arc-shaped groove 12 communicated with the accommodation area 11. The spray member 8 is slidably arranged in the arc-shaped groove 12 and the accommodation area 11, and a sealing cover plate 13 covering the arc-shaped groove 12 is arranged on the outside of the spray member 8.

[0027] The accommodation area 11 between the housing 10 and the bearing seat 1 and the arc-shaped groove 12 provide an operating space for the spray member 8, and the cooperation with the sealing cover plate 13 can effectively prevent the sprayed coolant from splashing into the surrounding environment, avoiding pollution or corrosion of other components.

[0028] As Figure 1 , Figure 3 shown, it further includes: An air inlet pipe 14 connected to the housing 10 to guide the outside air flow into the accommodation area 11; An air outlet pipe 15 connected to the housing 10 to discharge the air flow in the accommodation area 11; An air flow circulation channel in the accommodation area 11 is constructed by using the air inlet pipe 14 and the air outlet pipe 15. The outside air enters the accommodation area 11 through the air inlet pipe 14, exchanges heat with the coolant sprayed on the outer surface of the bearing seat 1 and the bearing seat itself, accelerates the evaporation of the coolant, absorbs heat and further reduces the temperature of the bearing seat 1, and then is discharged through the air outlet pipe 15. This process accelerates the heat dissipation and enhances the cooling effect. A liquid guide pipe 16 is connected to the horizontal low-level area of the accommodation area 11; Among them, the liquid guide pipe 16 can flow back to the collection area, and then after being processed, it can flow back to the liquid tank 3 for reuse, which also avoids the accumulation of excess coolant at the bottom of the accommodation area and reduces the corrosion risk.

[0029] As Figure 2 , Figure 7 shown, the motion conversion mechanism 9 includes: A toothed plate 91, connected to the output end of the reciprocating transmission member 6; A rotating ring 92, rotatably arranged on the surface of the bearing seat 1; A transmission gear 93, arranged on the rotating ring 92 and meshing with the toothed plate 91; The spraying member 8 is arranged on the rotating ring 92.

[0030] The meshing transmission mode between the toothed plate 91 and the transmission gear 93 converts the horizontal linear motion into the rotational motion of the rotating ring 92 around the axis, thereby realizing the effect of the spraying member rotating to expand the spraying range; As Figure 3 , Figure 4 shown, the spraying member 8 includes: An intermediate rotating ring 81, arranged on the surface of the bearing seat 1 and coaxially arranged with the bearing seat 1; An accommodation cavity 82 for accommodating coolant is arranged inside the intermediate rotating ring 81; A one-way diversion flow channel 83, with both ends respectively communicating with the accommodation cavity 82 and the liquid cavity 4, As the push plate 5 moves in the liquid cavity 4 along the transverse direction towards the one-way diversion flow channel 83, coolant is introduced into the accommodation cavity 82; A mist output rod 84, connected to the motion conversion mechanism 9 and communicating with the accommodation cavity 82 through a hose 85.

[0031] When the push plate 5 moves transversely in the liquid cavity 4, it can continuously introduce coolant into the accommodation cavity 82 and spray it out by the mist output rod 84. This structural design ensures that during the circumferential reciprocating rotation spraying process of the mist output rod 84, sufficient coolant supply can be synchronously realized without an external transmission source. And during the rotation spraying process, the hose 85 enables the mist output rod 84 to have good rotational flexibility and ensures the smooth transportation of the coolant.

[0032] As Figure 2 , Figure 5 shown, the circulating flow channel 7 includes a first pipeline 71 and a second pipeline 72. The push plate 5 divides the liquid cavity 4 into a first cavity 41 and a second cavity 42, and the first pipeline 71 and the second pipeline 72 are respectively communicated with the first cavity 41 and the second cavity 42; As the push plate 5 reciprocates transversely in the first cavity 41 / second cavity 42, coolant is introduced into the cooling cavity 2 through the first pipeline 71 / second pipeline 72.

[0033] The above-mentioned alternating liquid supply and two-way circulation method ensures that low-temperature coolant always flows into the cooling cavity 2, and the two pipelines alternately enter the cooling cavity from different angular paths respectively, ensuring the temperature balance of the entire bearing seat and avoiding the problem of reduced cooling effect caused by the increase in coolant temperature.

[0034] As Figure 2 shown, it also includes a refrigerating sheet 17 provided in the first cavity 41 and the second cavity 42 for refrigerating the coolant.

[0035] To ensure the cooling effect of the coolant flowing back into the cooling cavity 2, the refrigerating sheet 17 is used to cool down and provide stable coolant with cooling effect, so as to achieve a stable cooling effect on the bearing seat 1; As Figure 3 shown, the one-way diversion flow channel 83 includes a first conduit 831, a second conduit 832 and a third conduit 833. One ends of the first conduit 831 and the second conduit 832 are communicated with the third conduit 833, and the other ends of the first conduit 831 and the second conduit 832 are respectively communicated with the first cavity 41 and the second cavity 42, and the other end of the third conduit 833 is communicated with the accommodation cavity 82.

[0036] The above design is mainly to ensure that the coolant can only flow into the accommodation cavity 82 unidirectionally, prevent the coolant from flowing back, and also ensure the sustainable spraying of the spraying part 8.

[0037] As Figure 2 , Figure 6 shown, the reciprocating transmission member 6 includes a motor 61 and a reciprocating transmission screw 62. The output end of the motor 61 is connected to the reciprocating transmission screw 62. A moving block 63 is arranged on the reciprocating transmission screw 62. A push rod 64 with one end passing through the liquid tank 3 and connected to the push plate 5 is arranged on the moving block 63. The moving direction of the push rod 64 driven by the reciprocating transmission screw 62 is the same as the penetrating direction of the push rod 64.

[0038] The working principle and usage process of the present invention: The motor 61 drives the reciprocating transmission screw 62 to rotate, driving the push plate 5 to start reciprocating laterally in the liquid cavity 4. The coolant circulates between the first cavity 41 and the cooling cavity 2, and between the second cavity 42 and the cooling cavity 2, continuously absorbing the heat of the bearing seat 1 to complete the internal cooling operation of the bearing seat 1. Among them, the refrigerating sheet 17 continuously works to refrigerate the coolant in the first cavity 41 and the second cavity 42 to maintain the low-temperature state of the coolant; Meanwhile, the toothed plate 91 reciprocates with the moving block 63, and the engaged transmission teeth 93 synchronously drive the rotating ring 92 to rotate circumferentially around the axis of the bearing seat 1, causing the atomizing output rod 84 to rotate circumferentially around the bearing seat 1. Among them, when the push plate 5 reciprocates in the liquid cavity 4 and approaches the first conduit 831 and the second conduit 832 respectively, the coolant in the first cavity 41 or the second cavity 42 enters the accommodating cavity 82 inside the rotating middle ring 81. The coolant in the accommodating cavity 82 flows into the atomizing output rod 84 through the hose 85 and is finally sprayed onto the outer surface of the bearing seat 1 in an atomized form to complete the cooling operation of the outer surface of the bearing seat 1; During the spraying process, the air flow enters the accommodating area 11 through the air inlet pipe 14 and is then discharged through the air outlet pipe 15, continuously accelerating heat dissipation. The liquid droplets formed by the absorption of heat on the outer surface of the bearing seat 1 during spraying will continuously gather in the low-lying area of the accommodating area 11 and be discharged in a timely manner through the liquid guide pipe 16.

[0039] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cooling structure for a steam turbine bearing housing, comprising a bearing housing (1), characterized in that: It also includes: A cooling cavity (2) provided inside the bearing housing (1); A liquid tank (3) having a liquid cavity (4) for containing a coolant; A push plate (5) provided inside the liquid tank (3); A reciprocating transmission member (6) with its output end connected to the push plate (5) for driving the push plate (5) to reciprocate horizontally within the liquid cavity (4); A circulating reciprocating flow channel (7) with its two ends respectively communicating with the liquid cavity (4) and the cooling cavity (2); As the push plate (5) moves within the liquid tank (3) in a direction close to / away from the circulating reciprocating flow channel (7), coolant is introduced into the cooling cavity (2) / coolant in the cooling cavity (2) is extracted.

2. The cooling structure of a steam turbine bearing housing according to claim 1, wherein: It also includes: A spraying member (8) with its spraying end facing the outer surface of the bearing housing (1); A motion conversion mechanism (9) connected to the output end of the reciprocating transmission member (6); The spraying member (8) is provided on the motion conversion mechanism (9); As the reciprocating transmission member (6) reciprocates horizontally, it drives the motion conversion mechanism (9) to drive the spraying member (8) to rotate reciprocally around the axis of the bearing housing (1).

3. The cooling structure of a steam turbine bearing housing according to claim 2, characterized in that: It also includes a housing (10) sleeved outside the bearing housing (1). There is an accommodation area (11) between the housing (10) and the bearing housing (1). The housing (10) is provided with an arc-shaped groove (12) communicating with the accommodation area (11). The spraying member (8) is slidably provided within the arc-shaped groove (12) and the accommodation area (11). A sealing cover plate (13) covering the arc-shaped groove (12) is provided outside the spraying member (8).

4. A steam turbine bearing housing cooling structure according to claim 3, characterized in that: It also includes: An air inlet pipe (14) connected to the housing (10) to guide external air flow into the accommodation area (11); An air outlet pipe (15) connected to the housing (10) to discharge the air flow within the accommodation area (11); A liquid guide pipe (16) connected to the horizontal low-level area of the accommodation area (11).

5. The cooling structure of a steam turbine bearing pedestal according to claim 2, characterized in that: The motion conversion mechanism (9) includes: A toothed plate (91) connected to the output end of the reciprocating transmission member (6); A rotating ring (92) rotatably provided on the surface of the bearing housing (1); A transmission tooth (93) provided on the rotating ring (92) and meshing with the toothed plate (91); The spraying member (8) is provided on the rotating ring (92).

6. The cooling structure of a steam turbine bearing housing according to claim 2, characterized in that: The spraying member (8) includes: A middle rotating ring (81) provided on the surface of the bearing housing (1) and coaxially arranged with the bearing housing (1); An accommodation cavity (82) for containing coolant is provided inside the middle rotating ring (81); A one-way guiding flow channel (83) with its two ends respectively communicating with the accommodation cavity (82) and the liquid cavity (4), As the push plate (5) moves within the liquid cavity (4) in a direction close to the one-way guiding flow channel (83) horizontally, coolant is introduced into the accommodation cavity (82); A fog-like output rod (84) connected to the motion conversion mechanism (9) and communicating with the accommodation cavity (82) through a hose (85).

7. A steam turbine bearing pedestal cooling structure according to claim 6, characterized in that: The circulating reciprocating flow channel (7) includes a first pipeline (71) and a second pipeline (72). The push plate (5) divides the liquid cavity (4) into a first cavity (41) and a second cavity (42). The first pipeline (71) and the second pipeline (72) are respectively communicated with the first cavity (41) and the second cavity (42); As the push plate (5) reciprocates horizontally in the first chamber (41) / second chamber (42), coolant is introduced into the cooling chamber (2) through the first pipeline (71) / second pipeline (72).

8. A steam turbine bearing pedestal cooling structure according to claim 7, characterized in that: It further includes a refrigerating sheet (17) provided in the first chamber (41) and the second chamber (42) for refrigerating the coolant.

9. The cooling structure of a steam turbine bearing housing according to claim 7, wherein: The one-way diversion flow channel (83) includes a first conduit (831), a second conduit (832) and a third conduit (833). One ends of the first conduit (831) and the second conduit (832) are communicated with the third conduit (833). The other ends of the first conduit (831) and the second conduit (832) are respectively communicated with the first chamber (41) and the second chamber (42). The other end of the third conduit (833) is communicated with the accommodating chamber (82).

10. A steam turbine bearing pedestal cooling structure according to claim 1, characterized in that: The reciprocating transmission member (6) includes a motor (61) and a reciprocating transmission screw rod (62). The output end of the motor (61) is connected to the reciprocating transmission screw rod (62). A moving block (63) is arranged on the reciprocating transmission screw rod (62). A push rod (64) is arranged on the moving block (63), and one end of the push rod (64) penetrates through the liquid tank (3) and is connected to the push plate (5). The moving direction of the reciprocating transmission screw rod (62) for driving the push rod (64) is consistent with the penetrating direction of the push rod (64).

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