Adjustable differential pressure bypass assembly

Abstract

The utility model relates to the technical field of fluid control, and discloses an adjustable differential pressure bypass assembly which comprises a main pipeline, a valve seat is fixedly connected to the outer wall of the main pipeline, an adjusting screw rod is in threaded connection with the inner wall of the valve seat, a nut is fixedly connected to the top end of the adjusting screw rod, a protective sleeve is arranged on the outer wall of the valve seat in a sleeved mode, and the protective sleeve is connected with the nut. An abutting block is fixedly connected to the bottom end of the adjusting screw rod, a bearing block, a spring and a spring seat are arranged on the inner wall of the valve seat, a valve clack is fixedly connected to the inner wall of the spring seat, and an indicating assembly is arranged on the outer portion of the protective sleeve. According to the utility model, the protective sleeve is manually rotated to drive the adjusting screw rod and the abutting block inside to gradually extrude the bearing block and the spring, so that the spring seat and the valve clack provide different degrees of pre-tensioning force for the main pipeline, constant pressure difference values can be kept in various flow systems, the maximum working pressure difference of the circulating pump is effectively limited, and the service life of the circulating pump is prolonged. The system stability is kept.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid control technical field especially relates to adjustable pressure difference bypass assembly. BACKGROUND

[0002] In many fluid control systems, such as heating ventilation air conditioning systems, maintaining stable and accurate pressure difference is crucial for the normal operation of the system and the efficient work of the equipment. In the heating ventilation air conditioning system, appropriate pressure difference can ensure that each terminal device obtains stable flow, thereby realizing comfortable indoor environment regulation. Therefore, pressure difference bypass assembly, as a key device capable of adjusting system pressure difference, is widely used in these systems to realize effective control of pressure difference.

[0003] The traditional pressure difference bypass assembly utilizes the principle of communicating vessel. The water supply pipe and the return water pipe form a communicating loop through the bypass valve. When the resistance of a branch in the system changes, causing the supply and return water pressure difference to change, the water flow passes through the water supply pipe, pushes open the valve disc supported by the elastic assembly in the bypass valve, and enters the return water pipe to maintain the relative stability of the supply and return water pressure difference. However, in the long-term working process, due to the small adjustment range of the traditional pressure difference bypass assembly, it is difficult to adapt to the diversified needs of pressure difference under different working conditions, resulting in the inability of the valve body to provide accurate pressure difference adjustment, and further causing the instability of the flow of liquid in the pipeline. SUMMARY

[0004] In order to make up for the above shortcomings, the utility model provides an adjustable pressure difference bypass assembly, aiming at improving the problem of small adjustment range of the traditional pressure difference bypass assembly, which is difficult to adapt to the diversified needs of pressure difference under different working conditions.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: an adjustable pressure difference bypass assembly, comprising a main pipeline, the outer wall of the main pipeline is fixedly connected with a valve seat, the inner wall of the valve seat is threadedly connected with an adjusting screw, the top end of the adjusting screw is fixedly connected with a nut, the outer wall of the valve seat is sleeved with a protective sleeve, the bottom end of the adjusting screw is fixedly connected with an abutting block, the inner wall of the valve seat is provided with a receiving block, a spring and a spring seat, the inner wall of the spring seat is fixedly connected with a valve disc, the outer part of the protective sleeve is provided with an indicating assembly.

[0006] Preferably, the indicating assembly comprises a scale, the scale is arranged on the outer wall of the protective sleeve, the outer wall of the main pipeline is provided with an indication mark and a direction mark.

[0007] Preferably, the inner wall of the protective sleeve and the outer wall of the nut are both provided with threads, the threads of the protective sleeve and the thread teeth end of the nut are slidingly and meshingly connected, and the inner wall of the protective sleeve is slidingly connected to the outer wall of the valve seat.

[0008] Preferably, the bottom end of the abutting block and the top end of the receiving block are in sliding connection.

[0009] Preferably, one end of the spring is fixedly connected to the bottom end of the receiving block, and the other end of the spring is fixedly connected to the top end of the spring seat.

[0010] Preferably, the receiving block is in sliding connection with the inner wall of the valve seat, and the spring seat and the valve flap are in sliding connection with the inner wall of the main pipeline.

[0011] Preferably, the top end of the main pipeline is provided with a water inlet tee joint, one end of the water inlet tee joint is provided with a water supply pipe, and the other end of the water inlet tee joint is provided with an exhaust assembly.

[0012] Preferably, the bottom end of the main pipeline is provided with a communication pipe, the bottom end of the communication pipe is provided with a backwater tee joint, one end of the backwater tee joint is provided with a backwater pipe, and the other end of the backwater tee joint is provided with a drainage assembly.

[0013] The utility model has the following beneficial effects:

[0014] 1、 in the utility model, the adjusting screw and the abutting block in the inside are driven by the protective sleeve to gradually extrude the receiving block and the spring, so that the spring seat and the valve flap provide different degrees of pre-tightening force for the main pipeline, constant differential pressure values can be maintained in various flow systems, the maximum working differential pressure of the circulating pump is effectively limited, and the system is stable.

[0015] 2、 in the utility model, the scale provided on the outer wall of the protective sleeve and the indication mark provided on the main pipeline can intuitively show the user the adjustment range and direction, so that the user can flexibly adjust the differential pressure preset value under various conditions. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the front view of the adjustable differential pressure bypass assembly provided by the utility model;

[0017] Figure 2 It is the indication assembly of the adjustable differential pressure bypass assembly provided by the utility model, and the indication assembly is shown in the separate schematic diagram.

[0018] Figure 3 It is the internal sectional view of the valve body of the adjustable differential pressure bypass assembly provided by the utility model.

[0019] Figure 4 It is the exhaust assembly of the adjustable differential pressure bypass assembly provided by the utility model, and the exhaust assembly is shown in the separate schematic diagram.

[0020] LEGEND:

[0021] 1, main pipe; 2, valve seat; 3, adjusting screw; 4, nut; 5, protective sleeve; 6, abutment block; 7, receiving block; 8, spring; 9, spring seat; 10, valve flap; 11, scale; 12, indicator; 13, communication pipe; 14, water supply pipe; 15, return pipe; 16, water inlet tee; 17, exhaust assembly; 18, return tee; 19, drainage assembly; 20, direction mark. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be apparently and completely described in conjunction with the drawings of the description of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0023] With reference to Figure 1 , Figure 2 and Figure 3 , an embodiment provided by the utility model: adjustable differential pressure bypass assembly, including main pipe 1, the outer wall of main pipe 1 is fixedly connected with valve seat 2, the inner wall of valve seat 2 is threadedly connected with adjusting screw 3, the top end of adjusting screw 3 is fixedly connected with nut 4, the outer wall of valve seat 2 is sleeved with protective sleeve 5, the bottom end of adjusting screw 3 is fixedly connected with abutment block 6, the inner wall of valve seat 2 is provided with receiving block 7, spring 8 and spring seat 9, the inner wall of spring seat 9 is fixedly connected with valve flap 10, the outside of protective sleeve 5 is provided with indicating assembly, the inner wall of protective sleeve 5 and the outer wall of nut 4 are all provided with thread, the thread of protective sleeve 5 and the thread tooth end of nut 4 are slidably and meshingly connected, the inner wall of protective sleeve 5 is slidably connected on the outer wall of valve seat 2, the bottom end of abutment block 6 and the top end of receiving block 7 are slidably connected, one end of spring 8 is fixedly connected at the bottom end of receiving block 7, the other end of spring 8 is fixedly connected at the top end of spring seat 9, receiving block 7 is slidably connected on the inner wall of valve seat 2, spring seat 9 and valve flap 10 are slidably connected on the inner wall of main pipe 1.

[0024] Specifically, the top end of the main pipeline 1 is connected with a valve seat 2, the top end of the valve seat 2 is connected with an adjusting screw 3 through a threaded connection, the top end of the adjusting screw 3 is fixedly connected with a nut 4, the internal components are protected and dustproof through a protective sleeve 5, the thread on the inner wall of the protective sleeve 5 is consistent with the thread on the outer wall of the nut 4, the protective sleeve 5 can be firmly installed on the nut 4 through the thread, and can be removed at any time, after installation, the protective sleeve 5 can rotate freely around the outer wall of the valve seat 2, and drives the nut 4 to rotate, the nut 4 drives the adjusting screw 3 at the bottom to rotate, under the action of the thread, the adjusting screw 3 moves downward during rotation, thereby driving the abutting block 6 at the bottom of the adjusting screw 3 to move downward, abutting the abutting block 7 and extruding the spring 8 to gradually increase the pre-tightening force, the spring 8 transmits the pre-tightening force to the spring seat 9 and the valve disc 10 connected at the bottom, the valve disc 10 blocks the communication port of the main pipeline 1 and the valve seat 2, and waits for the liquid to open.

[0025] Referring to Figure 2 , the indicating assembly includes a scale 11, the scale 11 is arranged on the outer wall of the protective sleeve 5, and the outer wall of the main pipeline 1 is provided with an indicating mark 12 and a direction mark 20.

[0026] Specifically, when the internal pre-tightening force is adjusted by manually rotating the protective sleeve 5, the relative position of the scale 11 and the direction mark 20 arranged on the outer wall of the protective sleeve 5 can be directly observed to observe the tension level, so that the user can quickly adjust the differential pressure setting value through the scale 11.

[0027] Referring to Figure 1 and Figure 4 , the top end of the main pipeline 1 is provided with a water inlet tee joint 16, one end of the water inlet tee joint 16 is provided with a water supply pipe 14, the other end of the water inlet tee joint 16 is provided with an exhaust assembly 17, the bottom end of the main pipeline 1 is provided with a communication pipe 13, the bottom end of the communication pipe 13 is provided with a water return tee joint 18, one end of the water return tee joint 18 is provided with a water return pipe 15, and the other end of the water return tee joint 18 is provided with a drainage assembly 19.

[0028] Specifically, during the adjustment process, the liquid in the water supply pipe 14 enters the water inlet tee joint 16, enters the main pipeline 1 through the water inlet tee joint 16, opens the valve disc 10, enters the communication pipe 13, flows into the water return tee joint 18, enters the water return pipe 15, and then flows back to the pipeline to complete the differential pressure adjustment, the exhaust assembly 17 arranged at the top end of the water inlet tee joint 16 can be opened at any time to exhaust the internal gas, and the drainage assembly 19 arranged at the bottom end of the water return pipe 15 can also be opened at any time to assist in the differential pressure adjustment.

[0029] Working principle: when using the differential pressure bypass assembly, connect the water supply pipe 14 to the water outlet pipeline, and connect the return pipe 15 to the return pipeline. Rotate the protective sleeve 5 to drive the internal nut 4 and the adjusting screw 3 to rotate synchronously. Through the threaded relationship, the adjusting screw 3 is displaced downward during rotation, driving the abutting block 6 to abut the receiving block 7 and gradually extruding the spring 8 downward. The spring 8 extrudes the spring seat 9 and the valve disc 10 below through stress. The initial tension of the internal valve disc 10 is determined by the relative position of the scale 11 and the indicating mark 12 on the protective sleeve 5. When the pressure of the liquid in the water supply pipe 14 is greater than the pressure of the direction mark 20 and the tension of the valve disc 10, the valve disc 10 will be pushed upward, so that the liquid flows through the water inlet tee joint 16, the main pipeline 1, the communication pipe 13 and the water return tee joint 18 to the return pipe 15 in turn, thereby balancing the pressure on both sides and keeping the internal pipeline pressure constant, keeping the system stable.

[0030] The internal residual air can be discharged through the exhaust assembly 17, so that the differential pressure valve can more accurately perceive the real pressure of the system. When the internal pressure of the pipeline is too high and cannot be effectively reduced through the differential pressure valve adjustment, the overall system pressure can be reduced through the drainage assembly 19.

[0031] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. Adjustable differential pressure bypass assembly comprising a main duct (1), characterized in that: The outer wall of the main pipeline (1) is fixedly connected with a valve seat (2), the inner wall of the valve seat (2) is threadedly connected with an adjusting screw (3), the top end of the adjusting screw (3) is fixedly connected with a nut (4), the outer wall of the valve seat (2) is sleeved with a protective sleeve (5), the bottom end of the adjusting screw (3) is fixedly connected with an abutting block (6), the inner wall of the valve seat (2) is provided with a receiving block (7), a spring (8) and a spring seat (9), the inner wall of the spring seat (9) is fixedly connected with a valve clack (10), and the outer portion of the protective sleeve (5) is provided with an indicating assembly.

2. The adjustable differential pressure bypass assembly of claim 1, wherein: The indicating assembly comprises a scale (11) arranged on the outer wall of the protective sleeve (5), and the outer wall of the main pipeline (1) is provided with an indicating mark (12) and a direction mark (20).

3. The adjustable differential pressure bypass assembly of claim 1, wherein: The inner wall of the protective sleeve (5) and the outer wall of the nut (4) are both provided with threads, the threads of the protective sleeve (5) and the thread tooth end of the nut (4) are slidably and meshingly connected, and the inner wall of the protective sleeve (5) is slidably connected to the outer wall of the valve seat (2).

4. The adjustable differential pressure bypass assembly of claim 1, wherein: The bottom end of the abutting block (6) and the top end of the receiving block (7) are slidably connected.

5. The adjustable differential pressure bypass assembly of claim 1, wherein: One end of the spring (8) is fixedly connected to the bottom end of the receiving block (7), and the other end of the spring (8) is fixedly connected to the top end of the spring seat (9).

6. The adjustable differential pressure bypass assembly of claim 1, wherein: The receiving block (7) is slidably connected to the inner wall of the valve seat (2), and the spring seat (9) and the valve clack (10) are slidably connected to the inner wall of the main pipeline (1).

7. The adjustable differential pressure bypass assembly of claim 1, wherein: The top end of the main pipeline (1) is provided with a water inlet tee joint (16), one end of the water inlet tee joint (16) is mounted with a water supply pipe (14), and the other end of the water inlet tee joint (16) is mounted with an exhaust assembly (17).

8. The adjustable differential pressure bypass assembly of claim 1, wherein: The bottom end of the main pipeline (1) is provided with a communication pipe (13), the bottom end of the communication pipe (13) is provided with a water return tee joint (18), one end of the water return tee joint (18) is mounted with a water return pipe (15), and the other end of the water return tee joint (18) is mounted with a drainage assembly (19).

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