Forging equipment closed heat exchanger unit device based on constant-pressure variable water supply adjustment

Abstract

The invention relates to the technical field of forging equipment auxiliary systems, and provides a forging equipment closed heat exchanger unit device based on constant-pressure variable water supply adjustment, which is arranged between a forging equipment hydraulic system and an external cooling tower, and comprises a closed water tank, the internal circulation pump set is connected with the plate heat exchanger through an internal circulation pipeline and controls the pump rotating speed by installing a motor frequency converter, the plate heat exchanger is connected with an internal circulation water supply pipeline, the internal circulation water supply pipeline is connected with the water inlet end of the forging equipment hydraulic system, and the water outlet end of the forging equipment hydraulic system is connected with an internal circulation water return pipeline. The internal circulation water return pipeline is connected with the closed water tank, and the plate heat exchanger is further connected with an external circulation water supply pipeline and an external circulation water return pipeline. According to the heat exchange unit device, the risks that pipelines are rusted, the filter is blocked by silt and the heat exchanger is blocked by scaling of cooling water can be avoided to the maximum extent, and the risk that equipment suddenly shuts down is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of forging equipment auxiliary systems, and in particular to a closed heat exchange unit device of forging equipment based on constant pressure variable regulation of water supply. Background Art

[0002] The heat exchange system plays a vital role in the stable operation of large forging equipment. When the oil temperature of the hydraulic system exceeds 60°C, the system will trigger an alarm. Once it reaches 70°C, the entire equipment will trigger an emergency shutdown for safety protection. If the oil temperature is at a high temperature for a long time, the viscosity of the oil will decrease, the service life of the seal will be reduced, and there will be a risk of oil leakage, which will indirectly affect the continuity of equipment production and bring product quality risks. At present, the cooling circulation system of most forging equipment adopts the circulation method of open cooling tower + plate heat exchanger. The main problems are as follows:

[0003] 1. During the oil temperature adjustment process, when the water flow rate decreases and the temperature exceeds 50°C, calcium and magnesium ions in the water precipitate and produce scale, which causes the pipes and heat exchangers to be blocked, and the heat exchange efficiency is reduced, causing the fast forging unit to shut down due to excessive oil temperature; 2. The decrease in the heat exchange efficiency of the heat exchanger has no intuitive data support, and it is necessary to comprehensively judge the water flow rate, oil temperature, control valve opening and other information, which brings inconvenience to preventive maintenance; 3. The cost of fundamentally solving the problem of hard water quality is high.

[0004] If the equipment is interrupted due to abnormal oil temperature, maintenance personnel must replace and repair the heat exchanger, which is time-consuming and labor-intensive, and may bring safety risks to operators in hot summer weather. Therefore, it is urgent to optimize and transform the original cooling circulation system of the equipment to achieve low maintenance or even maintenance-free heat exchange system of large forging equipment, and avoid a series of risks caused by sudden shutdown.

[0005] In view of this, this invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a closed heat exchanger unit device for forging equipment based on constant pressure variable regulation of water supply, which can minimize the risks of pipeline corrosion, silt clogging filters and cooling water scaling clogging heat exchangers, thereby reducing the risk of sudden equipment shutdown.

[0007] The present invention discloses a closed heat exchanger unit device for forging equipment based on constant pressure variable regulation of water supply. The heat exchanger unit device is arranged between the hydraulic system of the forging equipment and the external cooling tower, and comprises: a closed water tank, one end of the closed water tank is connected to the control cabinet, and the other end is connected to the internal circulation pump group, the internal circulation pump group is connected to the plate heat exchanger through the internal circulation pipeline, the internal circulation pump group controls the pump speed by installing a motor frequency converter, the plate heat exchanger is connected to the internal circulation water supply pipeline, the internal circulation water supply pipeline is connected to the water inlet end of the hydraulic system of the forging equipment, the water outlet end of the hydraulic system of the forging equipment is connected to the internal circulation return pipeline, the internal circulation return pipeline is connected to the closed water tank, the plate heat exchanger is also connected to the external circulation water supply pipeline and the external circulation return pipeline, and the other ends of the external circulation return pipeline and the external circulation water supply pipeline are respectively connected to the water inlet and the water outlet of the external cooling tower.

[0008] Furthermore, the internal circulation pump group is composed of multiple internal circulation pumps, and the multiple internal circulation pumps are respectively connected to the lower water outlet of the closed water tank through connecting pipes. Correspondingly, multiple pipe joints are arranged on the internal circulation pipeline and are respectively connected to the multiple internal circulation pumps.

[0009] Furthermore, a remote pressure meter is installed on the inner circulation pipeline, and the remote pressure meter is used to collect the liquid pressure in the inner circulation pipeline in real time.

[0010] Furthermore, the motor frequency converter is installed in the control cabinet and adjusts the pump speed through the liquid pressure value signal transmitted by the remote pressure instrument.

[0011] The set value of the remote pressure instrument is 0.42MPa.

[0012] Furthermore, when the collected liquid pressure in the internal circulation pipeline is greater than 0.42 MPa, the motor inverter controls the internal circulation pump group to reduce the pump speed, thereby reducing the water supply flow rate.

[0013] Furthermore, when the collected liquid pressure in the internal circulation pipeline is less than 0.42 MPa, the motor inverter controls the internal circulation pump group to increase the pump speed, thereby increasing the water supply flow rate.

[0014] Furthermore, the internal circulation pipeline is connected to the upper end of the plate heat exchanger, and the internal circulation water supply pipeline is connected to the lower end of the plate heat exchanger. The water in the shell side of the hydraulic heat exchanger in the hydraulic system of the forging equipment is introduced into the internal circulation water supply pipeline as a cooling medium to perform heat exchange and cooling of the hydraulic oil in the tube side of the hydraulic heat exchanger.

[0015] Furthermore, the external circulation water return pipeline is connected to the upper end of the plate heat exchanger, and the external circulation water supply pipeline is connected to the lower end of the plate heat exchanger.

[0016] Furthermore, the inner circulation water return pipeline and the inner circulation water supply pipeline are both stainless steel pipes, and the outer circulation water return pipeline and the outer circulation water supply pipeline are both carbon steel pipes.

[0017] Furthermore, the closed water tank, control cabinet, internal circulation pump set and plate heat exchanger are assembled into a whole through a bottom support frame.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The optimization and transformation of the heat exchange system of forging equipment in this invention provides experience for the optimization of subsequent related equipment. On the one hand, it is feasible to adopt constant pressure variable control, and the operation is stable and without shock; on the other hand, the heat exchange system of the transformed equipment can basically achieve less maintenance or even maintenance-free, effectively saving manpower and material resource costs and improving equipment production efficiency;

[0020] 2. The system control method of the present invention adopts constant pressure variable control, which is a dynamic adjustment process. A pressure monitoring point is set on the main pipeline to ensure that the main pipeline has a water supply pressure of 0.42MPa. Once a branch pipeline is closed, resulting in the main pipeline being blocked, the control signal will immediately adjust the pump speed to achieve the purpose of energy saving and consumption reduction, and the economy is good;

[0021] 3. The present invention adds a stainless steel pipe as an internal circulation pipeline and retains the original carbon steel pipeline as an emergency pipeline. Tees and butterfly valves can be installed at each interface. Once the new system suddenly fails, the original pipeline can be manually switched, which has almost no impact on production continuity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the top view of the structure of the closed heat exchange unit device of forging equipment based on constant pressure variable regulation of water supply according to the present invention;

[0023] Figure 2 The figure is a schematic diagram of the piping connection of the heat exchange circulation system formed by the present invention.

[0024] Among them, 1-control cabinet; 2-internal circulation return pipeline; 3-closed water tank; 4-circulation pump group; 5-remote pressure gauge; 6-internal circulation water supply pipeline; 7-plate heat exchanger; 8-external circulation return pipeline; 9-external circulation water supply pipeline; 10-internal circulation pipeline. DETAILED DESCRIPTION

[0025] The embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention.

[0026] According to an embodiment of the present invention, a closed heat exchanger unit device for forging equipment based on constant pressure variable regulation of water supply is provided between the hydraulic system of the forging equipment and an external cooling tower. Figure 1 As shown, the heat exchange unit device of the present invention is composed of a closed water tank 3, an internal circulation pump group 4, an internal circulation pipeline 10, an internal circulation water supply pipeline 6, a plate heat exchanger 7, and the water inlet and outlet of the hydraulic system of the forging equipment to form a secondary side internal circulation water supply pipeline. Specifically, the bottom water outlet of the closed water tank 3 is connected to the internal circulation pump group 4 through a connecting pipe, the internal circulation pump group 4 is connected to the upper water inlet of the plate heat exchanger 7 through the internal circulation pipeline, the lower water outlet of the plate heat exchanger 7 is connected to the internal circulation water supply pipeline 6, the internal circulation water supply pipeline 6 is connected to the water inlet of the hydraulic system of the forging equipment, and the water outlet of the hydraulic system of the forging equipment is connected to the internal circulation return water pipeline 2, and the internal circulation return water pipeline 2 is connected to the upper water inlet of the closed water tank 3. The water in the internal circulation water supply pipeline 6 is used as a cooling medium to heat and cool the hydraulic oil in the total hydraulic heat exchanger pipe of the hydraulic system of the forging equipment.

[0027] According to the embodiment of the present invention, the inner circulating pure water is pumped into the plate heat exchanger 7 by the circulating pump group 4, and then sent to each hydraulic heat exchanger of the hydraulic system of the forging equipment after being cooled by the outer circulating cooling water. After the heat exchange is completed, the inner circulating water enters the closed water tank 3 and circulates back and forth.

[0028] According to an embodiment of the present invention, the internal circulation pump group 4 is composed of a plurality of internal circulation pumps, and the plurality of internal circulation pumps are respectively connected to the lower water outlet of the closed water tank 3 through connecting pipes. Correspondingly, a plurality of pipe joints are arranged on the internal circulation pipeline 10 and are respectively connected to the plurality of internal circulation pumps.

[0029] According to an embodiment of the present invention, a remote pressure meter 5 is installed on the inner circulation pipeline 10, which is used to collect the liquid pressure flowing through the inner circulation pipeline 10 in real time and transmit the liquid pressure signal to the motor frequency converter. The motor frequency converter is installed in the control cabinet 1, and the pump speed is adjusted by the liquid pressure value signal transmitted by the remote pressure meter 5. The setting value of the remote pressure meter is 0.42MPa. When the liquid pressure flowing through the inner circulation pipeline 10 is greater than 0.42MPa, the pressure signal is fed back to the frequency converter after PID adjustment, so that the motor frequency converter reduces the power-on frequency, controls the inner circulation pump group 4 to reduce the pump speed, and then reduces the water supply flow, and stabilizes the pressure at 0.42MPa through closed-loop control. When the liquid pressure passing through the inner circulation pipeline 10 is less than 0.42MPa, similarly, the motor frequency converter controls the inner circulation pump group 4 to increase the pump speed, thereby increasing the water supply flow, and stabilizes the pressure at 0.42MPa through closed-loop control. The inverter control signal is collected and adjusted in real time through the remote pressure gauge 5, so as to realize constant pressure variable water supply at the set pressure value.

[0030] According to an embodiment of the present invention, the plate heat exchanger 7, the external circulation water supply pipeline 9 and the external circulation water return pipeline 8 in the heat exchange unit device of the present invention, the other ends of the external circulation water return pipeline 8 and the external circulation water supply pipeline 9 are respectively connected to the water inlet and the water outlet of the external cooling tower, forming a primary side external circulation water supply pipeline. The external circulation water return pipeline 8 is connected to the upper end water outlet of the plate heat exchanger 7, and the external circulation water supply pipeline 9 is connected to the lower end water inlet of the plate heat exchanger 7. The cooling water from the external cooling tower is used to cool and exchange heat with the water in the pipe of the plate heat exchanger 7. The cooled water, as a cooling medium, is passed through the internal circulation water supply pipeline 6 to each hydraulic heat exchanger of the forging equipment and auxiliary machines to exchange heat with the high-temperature hydraulic oil.

[0031] According to the embodiment of the present invention, the present invention utilizes the existing carbon steel pipeline for transformation, cuts off the external circulation at the installation position, introduces the internal circulation cooling heat exchanger, namely the plate heat exchanger 7, and cools the internal circulation pure water, and then directly introduces it into each heat exchanger of the forging equipment and auxiliary machine through the newly arranged stainless steel pipe to exchange heat with the high-temperature hydraulic oil. The internal circulation pump group 4 can include two circulation pumps (one for use and one for backup), a closed water tank 3, a plate heat exchanger 7 and a control cabinet 1. The circulation pump pumps the internal circulation pure water into the plate heat exchanger 7, and after being cooled by the external circulation cooling water, it is sent to the heat exchangers of each equipment. After the heat exchange is completed, the internal circulation water enters the water tank and circulates back and forth.

[0032] According to an embodiment of the present invention, the inner circulation return water pipeline 2, the inner circulation water supply pipeline 6 and the inner circulation pipeline 10 are all stainless steel pipes, that is, the newly added pipelines are stainless steel pipes; the outer circulation return water pipeline 8 and the outer circulation water supply pipeline 9 are all carbon steel pipes.

[0033] According to the embodiment of the present invention, the closed water tank 3, the control cabinet 1, the internal circulation pump group 4 and the plate heat exchanger are assembled into a whole through the bottom support frame, thereby achieving the purpose of saving space and stable installation.

[0034] According to an embodiment of the present invention, Figure 2 As shown, the current internal circulation heat exchange system is a main pipeline (i.e., internal circulation water supply pipeline 6) that introduces internal circulation cooling water to the main oil tank of the forging main equipment, the control oil tank plate heat exchanger, and the two auxiliary equipment tubular heat exchangers, which is divided into 4 routes. A temperature control valve is installed on the return pipe of each route. When the oil tank temperature rises to the set value, it will open to cool the hydraulic oil; when the temperature drops below the set value, it will close. Therefore, the system is a dynamic adjustment system, and its control signal is the hydraulic oil temperature.

[0035] The present invention is based on the study of the working principle of the current heat exchanger system, and uses the total pipeline pressure signal as the control signal. It can be seen from the Bernoulli equation that the flow rate has a great relationship with the pressure difference, and there is also a certain relationship between the heat exchange efficiency and the flow rate. Therefore, in order to ensure good heat exchange, the system must have a constant water supply pressure. Considering that once a branch heat exchanger closes the temperature control valve due to low oil temperature, there will be no cooling water flowing through that branch, which will eventually lead to pressure buildup in the main pipeline. Based on the above analysis, a constant pressure variable control method is used to adjust the main pipeline water supply flow. That is, a remote pressure gauge 5 is installed on the internal circulation pipeline 10, and the set value is 0.42MPa. Once the pressure is higher than this value, the signal is transmitted to the motor inverter in the control cabinet 1, thereby reducing the pump speed and achieving the purpose of reducing the water supply flow; on the contrary, if the pressure is low, the pump speed will be increased again to ensure the required water supply flow.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A closed heat exchange unit device for forging equipment based on constant pressure variable regulation of water supply, characterized in that: The heat exchange unit device is arranged between the hydraulic system of the forging equipment and the external cooling tower, and comprises: a closed water tank (3), one end of the closed water tank (3) is connected to the control cabinet (1), and the other end is connected to the internal circulation pump group (4), the internal circulation pump group (4) is connected to the plate heat exchanger (7) through the internal circulation pipeline (10), and the internal circulation pump group (4) controls the pump speed by installing a motor frequency converter. The plate heat exchanger (7) is connected to an internal circulation water supply pipeline (6), and the internal circulation water supply pipeline (6) is connected to the water inlet end of the hydraulic system of the forging equipment. The water outlet end of the hydraulic system of the forging equipment is connected to an internal circulation water return pipeline (2), and the internal circulation water return pipeline (2) is connected to the closed water tank (3). The plate heat exchanger (7) is also connected to an external circulation water supply pipeline (9) and an external circulation water return pipeline (8), and the other ends of the external circulation water return pipeline (8) and the external circulation water supply pipeline (9) are respectively connected to the water inlet and the water outlet of the external cooling tower.

2. The closed heat exchange unit device for forging equipment based on constant pressure variable regulation of water supply according to claim 1 is characterized in that: The internal circulation pump group (4) is composed of a plurality of internal circulation pumps, and the plurality of internal circulation pumps are respectively connected to the water outlet at the lower end of the closed water tank (3) through connecting pipes. Correspondingly, a plurality of pipe joints are arranged on the internal circulation pipeline (10) and are respectively connected to the plurality of internal circulation pumps.

3. The closed heat exchange unit device for forging equipment based on constant pressure variable regulation of water supply according to claim 1 is characterized in that: A remote pressure meter (5) is installed on the internal circulation pipeline (10), and the remote pressure meter (5) is used to collect the liquid pressure in the internal circulation pipeline (10) in real time.

4. The closed heat exchange unit device for forging equipment based on constant pressure variable regulation of water supply according to any one of claims 1 to 3, characterized in that: The motor frequency converter is installed in the control cabinet (1) and adjusts the pump speed through the liquid pressure value signal transmitted by the remote pressure instrument (5). The setting value of the remote pressure instrument (5) is 0.42 MPa.

5. The closed heat exchange unit device for forging equipment based on constant pressure variable regulation of water supply according to claim 4 is characterized in that: When the collected liquid pressure in the internal circulation pipeline (10) is greater than 0.42 MPa, the motor frequency converter controls the internal circulation pump group (4) to reduce the pump speed, thereby reducing the water supply flow rate.

6. The closed heat exchange unit device for forging equipment based on constant pressure variable regulation of water supply according to claim 4 is characterized in that: When the collected liquid pressure in the internal circulation pipeline (10) is less than 0.42 MPa, the motor frequency converter controls the internal circulation pump group (4) to increase the pump speed, thereby increasing the water supply flow rate.

7. The closed heat exchange unit device for forging equipment based on constant pressure variable regulation of water supply according to claim 1 is characterized in that: The internal circulation pipeline (10) is connected to the upper end of the plate heat exchanger (7), and the internal circulation water supply pipeline (6) is connected to the lower end of the plate heat exchanger (7). The water in the shell side of the hydraulic heat exchanger in the hydraulic system of the forging equipment is introduced through the internal circulation water supply pipeline (6) as a cooling medium to heat and cool the hydraulic oil in the tube side of the hydraulic heat exchanger.

8. The closed heat exchange unit device for forging equipment based on constant pressure variable regulation of water supply according to claim 1 is characterized in that: The external circulation water return pipeline (9) is connected to the upper end of the plate heat exchanger (7), and the external circulation water supply pipeline (8) is connected to the lower end of the plate heat exchanger (7).

9. The closed heat exchange unit device for forging equipment based on constant pressure variable regulation of water supply according to claim 1, characterized in that: The inner circulation water return pipeline (2) and the inner circulation water supply pipeline (6) are both stainless steel pipes, and the outer circulation water return pipeline (9) and the outer circulation water supply pipeline (8) are both carbon steel pipes.

10. The closed heat exchange unit device for forging equipment based on constant pressure variable regulation of water supply according to claim 1, characterized in that: The closed water tank (3), the control cabinet (1), the internal circulation pump group (4) and the plate heat exchanger (7) are assembled into a whole through a bottom support frame.

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