一种用于子母式排水车的液压系统及子母式排水车
By designing a hydraulic system for a mother-daughter drainage vehicle, including a main hydraulic module, an oil tank, a daughter vehicle water pump, and a submersible pump hydraulic module, and combining a variable pump and control valve, the problem of the daughter vehicle water pump sucking up air and running dry under low immersion depth was solved, realizing normal drainage operation under low immersion depth and expanding the application scenarios.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZOOMLION ENVIRONMENTAL IND CO LTD
- Filing Date
- 2025-07-28
- Publication Date
- 2026-07-17
AI Technical Summary
Existing mother-daughter type drainage trucks are prone to problems such as the pump in the daughter truck running dry or running empty under low immersion depth conditions, making it impossible to perform water suction operations normally.
A hydraulic system for a mother-daughter type drainage vehicle was designed, including a main hydraulic module, an oil tank, a daughter vehicle water pump hydraulic module, and a submersible pump hydraulic module. The main hydraulic module simultaneously supplies oil to the daughter vehicle water pump and the submersible pump hydraulic module. Combined with a variable pump, control valve, and pressure sensor, the system achieves precise control and protection of the oil quantity, preventing cavitation and dry running.
Under low immersion depth conditions, it avoids the phenomenon of the pump in the sub-cart running dry, expands the application scenarios of the mother-daughter drainage truck, and improves the flexibility and efficiency of drainage operations.
Smart Images
Figure CN224515505U_ABST
Abstract
Claims
1. A hydraulic system for a mother-daughter type drainage vehicle, characterized in that, include: Main hydraulic module (110), oil tank (120), sub-cart water pump hydraulic module (130) and submersible pump hydraulic module (140); The main hydraulic module (110) has its oil inlet connected to the oil tank (120), and its oil outlet is connected to both the oil inlet of the submersible water pump hydraulic module (130) and the oil inlet of the submersible pump hydraulic module (140). The oil outlets of both the submersible water pump hydraulic module (130) and the submersible pump hydraulic module (140) are connected to the oil tank (120).
2. The hydraulic system for a mother-daughter sewer cleaning vehicle of claim 1, wherein, The main hydraulic module (110) includes a variable pump (111) and a first control valve (112). The oil inlet of the variable pump (111) is connected to the oil tank (120), and the oil outlet of the variable pump (111) is connected to both the oil inlet of the submersible water pump hydraulic module (130) and the oil inlet of the submersible pump hydraulic module (140). The first control valve (112) is connected to the variable pump (111) and is used to control the oil outlet state of the variable pump (111).
3. The hydraulic system for a mother-daughter sewer car of claim 2, wherein, The first control valve (112) includes an electro-proportional control valve (1121), which has a first port (1131), a second port (1132) and a third port (1133). The first port (1131) is connected to the oil outlet of the variable pump (111), the second port (1132) is connected to the oil tank (120), and the third port (1133) is connected to the first control chamber (1113) of the variable pump (111). The spring of the electro-proportional control valve (1121) cooperates with the connecting rod (115) of the variable pump (111). And / or, the first control valve (112) includes a power control valve (1122), the power control valve (1122) having a fourth port (1134), a fifth port (1135) and a sixth port (1136), the fourth port (1134) being connected to the oil outlet of the variable pump (111), the fifth port (1135) being connected to the oil tank (120), the sixth port (1136) being connected to the first control chamber (1113) of the variable pump (111), and the spring of the power control valve (1122) cooperating with the connecting rod (115) connected to the variable pump (111); And / or, the first control valve (112) includes a pressure shut-off valve (1123) having a seventh port (1137), an eighth port (1138) and a ninth port (1139), the seventh port (1137) being connected to the oil outlet of the variable pump (111), the eighth port (1138) being connected to the oil tank (120), and the ninth port (1139) being connected to the first control chamber (1113) of the variable pump (111).
4. The hydraulic system for a mother-daughter sewer car of claim 2, wherein, The first control valve (112) includes an electro-proportional control valve (1121), a power control valve (1122), and a pressure shut-off valve (1123). The electro-proportional control valve (1121) and the power control valve (1122) are both connected to the connecting rod (115) of the variable pump (111). The electro-proportional control valve (1121) has a first interface (1131), a second interface (1132) and a third interface (1133), the power control valve (1122) has a fourth interface (1134), a fifth interface (1135) and a sixth interface (1136), and the pressure shut-off valve (1123) has a seventh interface (1137), an eighth interface (1138) and a ninth interface (1139). The first interface (1131), the fourth interface (1134) and the seventh interface (1137) are all connected to the oil outlet of the variable pump (111), the second interface (1132) is connected to the sixth interface (1136), the third interface (1133) is connected to the eighth interface (1138), the fifth interface (1135) is connected to the oil tank (120), and the ninth interface (1139) is connected to the first control chamber (1113) of the variable pump (111).
5. The hydraulic system for a mother-daughter sewer car of claim 3 or 4, wherein, The connecting rod (115) includes a first support rod (1151), a second support rod (1152), and a third support rod (1153) connected in sequence. The first support rod (1151) is connected to the spring of the power control valve (1122). The first support rod (1151) and the second support rod (1152) are connected by a lever. The third support rod (1153) is connected to the plunger (1111) of the variable pump (111). When P*A*L2 / L1≥K, the power control valve (1122) is in the regulating state and oil enters the first control chamber (1113) to reduce the oil output of the variable pump (111); or, when P*A*L2 / L1<K, the power control valve (1122) is in the non-regulating state. Wherein, L1 is the length of the first support rod (1151) in the axial direction of the second control chamber (1112) perpendicular to the variable pump (111), L2 is the length of the second support rod (1152) in the axial direction of the second control chamber (1112), K is the restoring force of the spring of the power control valve (1122), P is the pump outlet pressure transmitted from the second control chamber (1112) and the central channel of the plunger (1111) to the end face of the third support rod (1153), and A is the axial end face area of the third support rod (1153).
6. The hydraulic system for a mother-daughter sewer cleaning vehicle of any of claims 1-4, wherein, An oil outlet end of the main hydraulic module (110) is connected with a main oil path (180), an oil inlet end of the sub-vehicle water pump hydraulic module (130) is connected with a first oil inlet path (181), an oil inlet end of the submersible pump hydraulic module (140) is connected with a second oil inlet path (182), the second oil inlet path (182) is communicated with a load pressure feedback loop (185), and the first oil inlet path (181) and the second oil inlet path (182) are both communicated with the main oil path (180); The hydraulic system for the sub-vehicle drainage vehicle further comprises a first pressure sensor (150) and / or a second pressure sensor (155), the first pressure sensor (150) is arranged on the main oil path (180), and the second pressure sensor (155) is arranged on the load pressure feedback loop (185).
7. The hydraulic system for a mother-daughter sewer car of claim 6, wherein, In a case where a detection difference between the first pressure sensor (150) and the second pressure sensor (155) is less than a preset value, an oil outlet amount of the main hydraulic module (110) is increased. Alternatively, in a case where the detection difference between the first pressure sensor (150) and the second pressure sensor (155) is greater than the preset value, the oil outlet amount of the main hydraulic module (110) is decreased.
8. The hydraulic system for a mother-daughter sewer car of claim 7, wherein, The preset value comprises a first numerical value dp1 and a second numerical value dp2, the detection difference is Δp, the submersible pump hydraulic module (140) comprises a pressure compensator (142), and a compensation pressure difference of the pressure compensator (142) is p3, wherein dp2-dp1=p3. In a case where Δp<dp1, the oil outlet amount of the main hydraulic module (110) is increased, or in a case where Δp>dp2, the oil outlet amount of the main hydraulic module (110) is decreased.
9. The hydraulic system for a mother-daughter sewer cleaning vehicle of any of claims 1-4, wherein, The submersible pump hydraulic module (140) comprises a reversing valve (141) and a second hydraulic motor (143), an oil inlet end of the reversing valve (141) is communicated with an oil outlet end of the main hydraulic module (110), an oil inlet end of the second hydraulic motor (143) is communicated with one of oil outlet ends of the reversing valve (141), and an oil outlet end of the second hydraulic motor (143) is communicated with the other oil outlet end of the reversing valve (141) or the oil tank (120).
10. A mother-daughter water cart, characterized by Comprise: The main hydraulic module (110) and the oil tank (120) are both connected to the mother vehicle, the sub-vehicle water pump hydraulic module (130) is connected to the sub-vehicle, and the submersible pump hydraulic module (140) is connected to the oil tank (120) through an oil pipe.