Constant volume valve group for double-cylinder displacement pump

Abstract

The utility model relates to a constant volume valve group, in particular to a constant volume valve group for a double-cylinder displacement pump. The constant volume valve set is composed of a liquid inlet tee joint, a liquid outlet tee joint, a first control mechanism and a second control mechanism, and the first control mechanism and the second control mechanism are arranged between the liquid inlet tee joint and the liquid outlet tee joint in parallel. The constant-volume valve bank can control switching of liquid inlet and liquid outlet of the double pumps, compared with other double-cylinder displacement pump valves, the constant-volume valve bank is shorter in response time, smaller in flow loss and not obvious in flow fluctuation, and the purpose of more accurately achieving constant-flow medium conveying can be achieved. The problem that an existing constant volume valve can only control a single pump and cannot meet the use requirement of a double-cylinder displacement pump is solved.

Description

Technical Field

[0001] The utility model relates to a constant-volume valve group, in particular to a constant-volume valve group for a double-cylinder displacement pump. Background Art

[0002] The double-cylinder displacement pump is a constant-speed and constant-flow conveying machine applied in the fields of metering, petroleum and chemical industry. It controls the alternate liquid inlet and liquid delivery of two pump bodies through a constant-volume valve to achieve the purpose of continuous, constant-flow and constant-speed delivery. The patent application with the publication number of CN117989331A discloses a pneumatic constant-volume valve, which comprises a valve body, an end cover, an upper slider, a lower slider, an assembly cylinder and a valve core; an upper connector is installed on the upper end of the valve body through the end cover; a lower connector is installed on the lower end of the valve body through the end cover; the lower end of the upper connector extends into the interior of the valve body and is slidably installed with the upper slider; the upper end of the lower connector extends into the interior of the valve body and is slidably installed with the lower slider; the upper slider and the lower slider are threadedly connected; the valve core is fixedly installed between the upper slider and the lower slider through the assembly cylinder; the valve core is intermittently and sealingly connected with the upper connector and the lower connector; an upper air inlet hole is arranged on the valve body between the upper slider and the end cover. This pneumatic constant-volume valve has a compact structure and ingenious design, solves the problem of slow response speed existing in the existing constant-volume valve, and meets the needs of gas flow control.

[0003] The above constant-volume valve can control the liquid inlet and outlet of a single-cylinder displacement pump. However, when it is applied to a double-cylinder displacement pump, since the double-cylinder displacement pump has two pump bodies and the two pump bodies need to alternately inlet and outlet liquid. Therefore, it is necessary to design a constant-volume valve group for a double-cylinder displacement pump to meet the use requirements. Summary of the Invention

[0004] The purpose of the utility model is to provide a constant-volume valve group for a double-cylinder displacement pump that can cooperate and meet the requirements of alternate liquid inlet and outlet of the double-cylinder displacement pump.

[0005] The technical solution of the utility model is as follows:

[0006] A constant-volume valve group for a double-cylinder displacement pump is composed of an inlet three-way and an outlet three-way arranged up and down, a first control mechanism and a second control mechanism. It is characterized in that: the first control mechanism and the second control mechanism are arranged in parallel between the inlet three-way and the outlet three-way.

[0007] The first control mechanism and the second control mechanism are respectively composed of an intermediate body, an inlet constant-volume valve and an outlet constant-volume valve. The inlet constant-volume valve is arranged on the intermediate body on one side of the inlet three-way, and the outlet constant-volume valve is arranged on the intermediate body on one side of the outlet three-way.

[0008] A T-shaped flow hole is arranged on the intermediate body.

[0009] The first port of the described flow-through hole communicates with the liquid inlet three-way through the liquid inlet constant volume valve; the second port of the flow-through hole communicates with the liquid outlet three-way through the liquid outlet constant volume valve.

[0010] The third port of the flow-through hole of the first control mechanism intermediate body communicates with one of the pump bodies of the double-cylinder displacement pump; the third port of the flow-through hole of the second control mechanism intermediate body communicates with the other pump body of the double-cylinder displacement pump.

[0011] The beneficial effects of the present utility model are as follows:

[0012] The constant volume valve group for this double-cylinder displacement pump can control the liquid inlet and outlet switching of the double pumps. Compared with other double-cylinder displacement pumps, the valve response time is faster, the flow loss is smaller, the flow fluctuation is not obvious, and it can more accurately achieve the purpose of constant flow conveying of the medium. To maintain a constant flow output, frequent pump-in and pump-out operations are required. For ordinary constant volume valves, due to the too long response time during switching, the flow loss is large and the fluctuation is obvious. After the solenoid valve is ventilated under the control of the constant volume valve group control system, the response only takes 0.1 s, and the operation of switching the liquid inlet and outlet of the double cylinders can be completed. The flow loss is almost zero, and a constant flow mode can be achieved. Moreover, the constant volume valve group has good airtightness and can well stabilize the pressure. It can better cooperate with the system to continuously monitor the pressure of the pump in real time through the pressure transmitter, and perform feedback control according to the difference between the actual pressure and the set pressure. The output is dynamically adjusted according to the feedback information, so that the output of the pump can respond to the change of pressure in time and remain within the set constant pressure range, realizing the constant pressure mode. It solves the problem that the existing constant volume valve can only control a single pump and cannot meet the usage requirements of the double-cylinder displacement pump. Description of the Drawings

[0013] Figure 1 is the structural schematic diagram of the present utility model;

[0014] Figure 2 is the cross-sectional schematic diagram of the present utility model.

[0015] In the figure: 1, liquid inlet three-way; 2, liquid outlet three-way; 3, intermediate body; 4, liquid inlet constant volume valve; 5, liquid outlet constant volume valve; 6, flow-through hole; 101, liquid inlet interface; 102, liquid outlet interface; 401, constant volume valve air change interface; 601, first port of the flow-through hole; 602, second port of the flow-through hole; 603, third port of the flow-through hole. Detailed Embodiment

[0016] The constant-volume valve group for the double-cylinder displacement pump is composed of an inlet three-way joint 1 and an outlet three-way joint 2 arranged vertically, a first control mechanism, and a second control mechanism. The first control mechanism and the second control mechanism are arranged in parallel between the inlet three-way joint 1 and the outlet three-way joint 2. One end of the first control mechanism and the second control mechanism are respectively connected to the inlet three-way joint 1, and the other end of the first control mechanism and the second control mechanism are respectively connected to the outlet three-way joint 2. The inlet three-way joint 1 is communicated with the inlet pipe through an inlet interface 101. The outlet three-way joint 2 is communicated with the outlet pipe through an outlet interface 102. The function of the first control mechanism is to control the switching of the liquid inlet and outlet of one of the pump bodies of the double-cylinder displacement pump through the first control mechanism. The function of the second control mechanism is to control the switching of the liquid inlet and outlet of the other pump body of the double-cylinder displacement pump through the second control mechanism, and then cooperate with the first control mechanism to control the double-cylinder displacement pump to alternately inlet and outlet liquid. When one pump body is inletting liquid, the other pump body is controlled to outlet liquid, and so on alternately, so as to continuously inlet and outlet liquid, ensuring continuous, constant-flow, and constant-speed transportation.

[0017] The first control mechanism and the second control mechanism are respectively composed of an intermediate body 3, an inlet constant-volume valve 4, and an outlet constant-volume valve 5. The inlet constant-volume valve 4 is arranged on the intermediate body 3 on one side of the inlet three-way joint 1 to control the liquid inlet to the pump body of the double-cylinder displacement pump through the inlet constant-volume valve 4. The outlet constant-volume valve 5 is arranged on the intermediate body 3 on one side of the outlet three-way joint 2 to control the liquid outlet of the pump body of the double-cylinder displacement pump through the outlet constant-volume valve 5. The inlet constant-volume valve 4 and the outlet constant-volume valve 5 respectively include a valve body, an upper slider, a lower slider, and a conical valve core. The upper slider and the lower slider that are threadedly connected to each other are movably installed in the valve body. A conical valve core is arranged in the middle of the upper slider and the lower slider. The annulus between the upper slider and the valve body and the annulus between the lower slider and the valve body are respectively communicated with the constant-volume valve air exchange interface to exchange air or exhaust air to the annulus between the upper slider and the valve body and the annulus between the lower slider and the valve body through the constant-volume valve air exchange interface, drive the upper slider and the lower slider to slide, and then drive the conical valve core to slide, so as to block or open the flow through the conical valve core, thereby opening or closing the inlet constant-volume valve 4 and the outlet constant-volume valve 5.

[0018] A T-shaped flow hole 6 is arranged on the intermediate body 3. The first port of the flow hole 6 is communicated with the inlet three-way joint 1 through the inlet constant-volume valve 4; the second port of the flow hole 6 is communicated with the outlet three-way joint 2 through the outlet constant-volume valve 5. The third port of the flow hole 6 of the intermediate body 3 of the first control mechanism is communicated with one of the pump bodies of the double-cylinder displacement pump; the third port of the flow hole 6 of the intermediate body 3 of the second control mechanism is communicated with the other pump body of the double-cylinder displacement pump. The pump body of the double-cylinder displacement pump is successively communicated with the inlet three-way joint 1 through the flow hole 6 and the inlet constant-volume valve 4; the pump body of the double-cylinder displacement pump is successively communicated with the outlet three-way joint 2 through the flow hole 6 and the outlet constant-volume valve 5.

[0019] When the constant - volume valve group for the double - cylinder displacement pump is working, the liquid - inlet constant - volume valve 4 of the first control mechanism is opened, and the liquid - outlet constant - volume valve 5 is closed; the liquid - inlet constant - volume valve 4 of the second control mechanism is closed, and the liquid - outlet constant - volume valve 5 is opened. When the double - cylinder displacement pump is working, the conveying medium sequentially passes through the liquid - inlet tee 1, the liquid - inlet constant - volume valve 4 of the first control mechanism, and the flow - through hole 6 and enters one of the pump bodies of the double - cylinder displacement pump; the other pump body of the double - cylinder displacement pump sequentially passes through the flow - through hole 6, the liquid - outlet constant - volume valve 5 of the second control mechanism, and the liquid - outlet tee 2 to convey the medium outward. After the liquid inlet and outlet are completed, the liquid - inlet constant - volume valve 4 of the first control mechanism is closed, and the liquid - outlet constant - volume valve 5 is opened; the liquid - inlet constant - volume valve 4 of the second control mechanism is opened, and the liquid - outlet constant - volume valve 5 is closed. The conveying medium sequentially passes through the liquid - inlet tee 1, the liquid - inlet constant - volume valve 4 of the first control mechanism, and the flow - through hole 6 and enters the other pump body of the double - cylinder displacement pump; one of the pump bodies of the double - cylinder displacement pump sequentially passes through the flow - through hole 6, the liquid - outlet constant - volume valve 5 of the second control mechanism, and the liquid - outlet tee 2 to convey the medium outward. In this way, it alternates reciprocally to perform continuous liquid inlet and outlet, and then continuously conveys the medium.

[0020] The constant - volume valve group for the double - cylinder displacement pump can control the liquid inlet and outlet switching of the double pumps. Compared with other double - cylinder displacement pump valves, it has a faster valve response time, less flow loss, and less obvious flow fluctuation, and can more accurately achieve the purpose of constant - flow conveying of the medium. To maintain a constant flow output, frequent pump - in and pump - out operations are required. Ordinary constant - volume valves have a large flow loss and obvious fluctuations due to too long response time during switching. After the control system of this constant - volume valve group controls the solenoid valve to let air in, the response only takes 0.1 s, and the operation of switching the liquid inlet and outlet of the double cylinders can be completed. The flow loss is almost zero, and a constant - flow mode can be achieved. Moreover, this constant - volume valve group has good airtightness and can stabilize the pressure well. It can better cooperate with the system to continuously monitor the pressure of the pump in real - time through a pressure transmitter, and perform feedback control according to the difference between the actual pressure and the set pressure, and dynamically adjust the output according to the feedback information, so that the output of the pump can respond to the change of pressure in time and remain within the set constant - pressure range, realizing a constant - pressure mode. It solves the problem that the existing constant - volume valve can only control a single pump and cannot meet the usage requirements of the double - cylinder displacement pump.

Claims

1. A constant volume valve group for a double-cylinder displacement pump, which is composed of a liquid inlet three-way joint (1) and a liquid outlet three-way joint (2) arranged up and down, a first control mechanism and a second control mechanism, and is characterized in that: A first control mechanism and a second control mechanism are arranged in parallel between the liquid inlet three-way joint (1) and the liquid outlet three-way joint (2).

2. The constant volume valve group for a double-cylinder displacement pump according to claim 1, characterized in that: The first control mechanism and the second control mechanism are respectively composed of an intermediate body (3), a liquid inlet constant volume valve (4) and a liquid outlet constant volume valve (5). The liquid inlet constant volume valve (4) is arranged on the intermediate body (3) on one side of the liquid inlet three-way joint (1), and the liquid outlet constant volume valve (5) is arranged on the intermediate body (3) on one side of the liquid outlet three-way joint (2).

3. The constant volume valve group for a double-cylinder displacement pump according to claim 2, characterized in that: A T-shaped flow hole (6) is arranged on the intermediate body (3).

4. The constant volume valve group for a double-cylinder displacement pump according to claim 3, characterized in that: The first port of the flow hole (6) is communicated with the liquid inlet three-way joint (1) through the liquid inlet constant volume valve (4); the second port of the flow hole (6) is communicated with the liquid outlet three-way joint (2) through the liquid outlet constant volume valve (5).

5. The constant volume valve group for a double-cylinder displacement pump according to claim 3, characterized in that: The third port of the flow hole (6) of the intermediate body (3) of the first control mechanism is communicated with one of the pump bodies of the double-cylinder displacement pump; the third port of the flow hole (6) of the intermediate body (3) of the second control mechanism is communicated with the other pump body of the double-cylinder displacement pump.

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