Mechanical condensate recovery pump spring assembly

Abstract

The utility model relates to the field of mechanical condensate water recovery pump, relate to a mechanical condensate water recovery pump compression spring subassembly, the utility model discloses spring support, spring bolt and compression spring, spring bolt one end from spring support one side's long hole enters into spring mounting chamber inside in spring support, the left side fixed with fixed guide bush in spring mounting chamber, the end of spring bolt is fixed with movable guide bush, the middle welding of movable guide bush has small cylindrical section, forms the accommodation groove between small cylindrical section and movable guide bush, one end of compression spring enters into fixed guide bush and the other end enters into the accommodation groove, compression spring is set up on spring bolt and is fixed with fixed guide bush and movable guide bush respectively in both ends, the outside of movable guide bush and the clearance fit of the inner wall of spring support, effectively avoid compression spring instability skew.

Description

Technical Field

[0001] This utility model relates to the field of mechanical condensate recovery pumps, and specifically to a spring assembly for a mechanical condensate recovery pump. Background Technology

[0002] Existing mechanical steam condensate recovery pumps employ two structural forms: tension springs and compression springs. Tension springs have a shorter lifespan in actual use. Under normal operating conditions, the spring linkage mechanism operates cyclically for extended periods, causing the springs to stretch and contract cyclically for a long time, leading to spring fatigue and reduced elasticity, requiring frequent replacement or pre-tightening. When used with superheated steam, the springs are prone to breakage, causing the mechanical steam condensate recovery pump to shut down, resulting in frequent downtime for maintenance and increased operating and maintenance costs for the user.

[0003] like Figure 1 As shown, the applicant's earlier application, Chinese Patent Application No. CN201820577785.2, discloses a spring assembly for a mechanical condensate recovery pump, including a spring bracket 5 and a spring 3. The spring bracket is provided with a spring mounting cavity for receiving the spring. One end of the spring bracket has a protruding connecting part, and the other end has a process elongated hole. An external connecting hole for the spring assembly is opened on the connecting part. One end of a spring bolt 1 passes through the process elongated hole and the spring and is threadedly connected to a threaded hole on a spring nut 4 located in the spring mounting cavity. The other end of the bolt has an external connecting hole, and a tightening bolt 6 is installed in the threaded hole and tightened against the end of the spring bolt. A spring retaining ring 2 is fixedly connected in the spring mounting cavity. This spring assembly changes from a tension spring to a compression spring structure, thereby ensuring that the mechanism can still maintain a stable elastic modulus and strength during long-term periodic contraction and rebound.

[0004] The main drawback is caused by the inherent characteristics of cylindrical helical compression springs. Working stability is an indicator that must be calculated during design. For compression springs with a large height-to-diameter ratio b, when the axial load reaches a certain level, lateral bending will occur and stability will be lost. This tendency to lose stability is unavoidable when the compression spring is under stress. The height-to-diameter ratio b should meet the following requirements: (1) Both ends of the compression spring are fixed: b≤5.3 (2) One end of the compression spring is fixed and the other end rotates: b≤3.7 (3) Both ends of the compression spring rotate: b≤2.6 It can be seen that the stability is best when both ends are fixed.

[0005] Studies have found that during compression, because the two adjacent spring wires on the tightly closed side X are closer together, they receive greater support and have relatively higher stiffness. Therefore, the spring's tendency to buckle is always as follows: Figure 2 The spring's shape causes it to tilt towards the tightened end, resulting in a tension F generated by the spring. jThe direction and tension F are not axial. When two compression spring assemblies are used in a pump system, assuming the same force F is applied, due to the random rotational change of the position of the clamped ends, the two sets of compression spring assemblies will produce the following... Figure 3 In this state, the pin is under tension F j Under the action of axial force, axial movement occurs, which can easily cause wear, damage and detachment of the unilateral locating pin, leading to mechanism failure. At the same time, the pin and linkage mechanism will also be twisted, increasing the friction of the entire motion mechanism and reducing its flexibility. Utility Model Content

[0006] To address the problems of the prior art, this utility model provides a mechanical condensate recovery pump spring assembly.

[0007] The objective of this utility model can be achieved through the following technical solution: A mechanical condensate recovery pump spring assembly includes a spring bracket, a spring bolt, and a compression spring. One end of the spring bolt extends from an elongated hole on one side of the spring bracket into a spring mounting cavity inside the spring bracket. A fixed guide sleeve is fixed on the left side of the spring mounting cavity. A movable guide sleeve is fixed at the end of the spring bolt. A small cylindrical section is welded in the middle of the movable guide sleeve, and a receiving groove is formed between the small cylindrical section and the movable guide sleeve. One end of the compression spring extends into the fixed guide sleeve and the other end extends into the receiving groove. The compression spring is sleeved on the spring bolt, and both ends are fixed to the fixed guide sleeve and the movable guide sleeve, respectively. The outer side of the movable guide sleeve is clearance-fitted with the inner wall of the spring bracket.

[0008] In a further improvement, a guide rod ring is fixed on the spring bolt. The inner diameter of the guide rod ring is configured to fit the spring bolt with a small clearance, and its outer diameter is smaller than the inner diameter of the compression spring. The outer diameter of the small cylindrical section is equal to or smaller than the inner diameter of the compression spring.

[0009] In a further improvement, the fixed guide sleeve is provided with an anti-rotation protrusion, which presses against the compression spring and tightens the spring wire section; the compression spring is welded to the small cylindrical section or the movable guide sleeve, or another set of anti-rotation protrusions is arranged at the bottom of the receiving groove to fix the other end of the compression spring.

[0010] As a further improvement, the end faces of the fixed guide sleeve, the movable guide sleeve, the small cylindrical section, and the guide rod ring that contact the compression spring are all provided with chamfers.

[0011] In a further improvement, the depth of both the fixed guide sleeve and the receiving groove is greater than the size of the compression spring and its tight end.

[0012] In a further improvement, the fixed guide sleeve is welded and fixed inside the spring bracket and is located at the end of the spring mounting cavity facing the elongated hole.

[0013] A further improvement is that the small cylindrical section has a tightening bolt.

[0014] Compared with the prior art, the beneficial effects of the mechanical condensate recovery pump spring assembly of this utility model are as follows:

[0015] By setting fixed and movable guide sleeves to restrict the rotational freedom of the compression spring, and changing its fixing method from rotation at both ends to fixing at both ends, and adding guide rod rings to ensure that the tension and strain directions are consistent, the compression spring is effectively prevented from becoming unstable and tilted, reducing mechanical failures caused by force direction deviation, reducing component wear, extending service life, improving the performance of the condensate recovery pump, reducing equipment failures, and lowering the company's operating and maintenance costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a compression spring assembly in the prior art;

[0017] Figure 2 This is a structural schematic diagram of another state of the compression spring assembly in the prior art;

[0018] Figure 3 This is a structural schematic diagram illustrating the mechanical state of two sets of compression spring assemblies in the prior art.

[0019] Figure 4 This is a schematic diagram of the spring assembly of the mechanical condensate recovery pump of this utility model;

[0020] Figure 5 This is a schematic diagram of the present invention applied to a condensate recovery pump. In the figure, 1-connecting rod one, 2-compression spring assembly, 3-connecting rod two, 4-connecting rod three, 15-pump cover, 6-linkage mechanism assembly, 7-pump body, 8-float, 9-check valve one, 10-check valve two, 11-connecting rod four, 12-fixed plate, 18-inlet valve seat, 19-exhaust valve seat, 23-inlet valve core, 24-exhaust valve core, 31-spring bolt, 32-fixed guide sleeve, 321-anti-rotation protrusion, 33-compression spring, 34-guide rod ring, 35-small cylindrical section, 36-spring bracket, 37-tightening bolt, 38-movable guide sleeve. Detailed Implementation

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; unless otherwise expressly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, they can refer to fixed connections or detachable connections, etc. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0022] The following is a description of the embodiments and appendices. Figures 1-5 The technical solution of this utility model will be further described below.

[0023] Example 1

[0024] A mechanical condensate recovery pump spring assembly includes a spring bracket 36, a spring bolt 31, and a compression spring 33. One end of the spring bolt 31 extends from an elongated hole on one side of the spring bracket 36 into a spring mounting cavity inside the spring bracket 36. A fixed guide sleeve 32 is fixed on the left side of the spring mounting cavity. A movable guide sleeve 38 is fixed to the end of the spring bolt 31. A small cylindrical section 35 is welded to the middle of the movable guide sleeve 38, forming a receiving groove between the small cylindrical section 35 and the movable guide sleeve 38. One end of the compression spring 33 extends into the fixed guide sleeve 32, and the other end extends into the receiving groove. The compression spring 33 is sleeved on the spring bolt 31, and both ends are fixed to the fixed guide sleeve 32 and the movable guide sleeve 38, respectively. The outer side of the movable guide sleeve 38 is clearance-fitted with the inner wall of the spring bracket 36.

[0025] In existing mechanical condensate recovery pump compression spring assemblies, the compression springs suffer from poor stability and are prone to instability and skewness due to their height-to-diameter ratio. This causes the tension direction and the pulling force direction generated by the spring to be inconsistent, which in turn leads to mechanical failure.

[0026] like Figures 1-5 As shown, the working principle of this utility model is as follows: By setting a fixed guide sleeve and a movable guide sleeve inside the spring bracket, the rotational freedom of the compression spring is restricted. The fixed guide sleeve and the movable guide sleeve are fixed to both ends of the compression spring, and the outer side of the movable guide sleeve is clearance-fitted with the inner wall of the spring bracket. This changes the fixing method of the compression spring from both ends to both ends being fixed. According to the relationship between the stability of the compression spring and the fixing method, the stability is optimal when both ends are fixed, thus greatly improving the stability of the mechanism.

[0027] In practical applications, when this compression spring assembly is installed on a condensate recovery pump, the rotational freedom of the compression spring is restricted. The anti-rotation structure, which uses the anti-rotation protrusion inside the fixed guide sleeve to press against the spring and tighten the spring wire section, serves as an identification mark. When the two sets of spring assemblies are used in pairs, the axial component forces generated by the two sets of spring assemblies can cancel each other out, and the mechanism will not produce axial movement. This significantly improves the performance of the entire condensate recovery pump, reduces equipment failures caused by spring assembly problems, and lowers the company's operating costs and equipment maintenance costs.

[0028] As a further preferred embodiment, a guide ring 34 is fixed to the spring bolt 31. The inner diameter of the guide ring 34 is configured with a small clearance fit to the spring bolt 31, and its outer diameter is smaller than the inner diameter of the compression spring 33. The outer diameter of the small cylindrical section 35 is equal to or smaller than the inner diameter of the compression spring 33. By fixing the guide ring to the spring bolt, with its inner diameter fitting the spring bolt with a small clearance and its outer diameter smaller than the inner diameter of the compression spring, the guide ring guides the spring bolt when it is compressed or extended, ensuring its stability during movement. This ensures that the direction of tension and traction is more consistent during the compression spring's extension and retraction, effectively reducing problems such as axial movement of the pin and wear of the unilateral locating pin caused by force direction deviation, thus improving the stability and reliability of the entire compression spring assembly.

[0029] As a further preferred embodiment, the fixed guide sleeve 32 is provided with an anti-rotation protrusion 321. The anti-rotation protrusion 321 presses against the compression spring 33 and tightens the spring wire section, restricting the rotation of the compression spring. The compression spring 33 is welded to the small cylindrical section 35 or the movable guide sleeve 38, or another set of anti-rotation protrusions 321 is arranged at the bottom of the receiving groove to fix the other end of the compression spring 33, further enhancing the restriction on the rotation of the compression spring. The compression spring can maintain a stable posture during operation and will not tilt or become unstable due to rotation.

[0030] As a further preferred embodiment, the end faces of the fixed guide sleeve 32, the movable guide sleeve 38, the small cylindrical section 35, and the guide rod ring 34 that contact the compression spring 33 are all provided with chamfers. The chamfers allow the spring to extend more smoothly into the fixed guide sleeve and the receiving groove, reduce the frictional resistance between the spring and the end faces of each component, and also ensure that the compression spring is not stuck by the edge of the guide rod ring during compression.

[0031] As a further preferred embodiment, the depths of the fixed guide sleeve 32 and the receiving groove are both greater than the dimensions of the compressed end of the compression spring 33. The greater depth of the fixed guide sleeve and the receiving groove allows for the accommodation of more spring wires, providing ample space for spring compression and preventing deformation or damage to the spring during compression due to limited space.

[0032] As a further preferred embodiment, the fixed guide sleeve 32 is welded and fixed inside the spring bracket 36 and is located at the end of the spring mounting cavity facing the elongated hole, so that one end of the compression spring can be stably supported and positioned during installation and operation.

[0033] As a further preferred embodiment, the small cylindrical section 35 has a tightening bolt 37. The tightening bolt can further secure the connection between the movable guide sleeve and the spring bolt, preventing loosening between the movable guide sleeve and the spring bolt due to vibration or force during the operation of the compression spring assembly.

[0034] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A mechanical condensate recovery pump spring assembly, characterized in that, The device includes a spring bracket, a spring bolt, and a compression spring. One end of the spring bolt extends from an elongated hole on one side of the spring bracket into a spring mounting cavity inside the spring bracket. A fixed guide sleeve is fixed on the left side of the spring mounting cavity. A movable guide sleeve is fixed to the end of the spring bolt. A small cylindrical section is welded to the middle of the movable guide sleeve, forming a receiving groove between the small cylindrical section and the movable guide sleeve. One end of the compression spring extends into the fixed guide sleeve, and the other end extends into the receiving groove. The compression spring is sleeved on the spring bolt, and its two ends are fixed to the fixed guide sleeve and the movable guide sleeve, respectively. The outer side of the movable guide sleeve is clearance-fitted with the inner wall of the spring bracket.

2. The mechanical condensate recovery pump spring assembly according to claim 1, characterized in that, A guide rod ring is fixed on the spring bolt. The inner diameter of the guide rod ring is set with a small clearance fit to the spring bolt, and the outer diameter is smaller than the inner diameter of the compression spring. The outer diameter of the small cylindrical section is equal to or smaller than the inner diameter of the compression spring.

3. The mechanical condensate recovery pump spring assembly according to claim 1, characterized in that, The fixed guide sleeve is provided with an anti-rotation protrusion, which presses against the compression spring and tightens the spring wire section; the compression spring is welded to the small cylindrical section or the movable guide sleeve, or another set of anti-rotation protrusions is arranged at the bottom of the receiving groove to fix the other end of the compression spring.

4. The mechanical condensate recovery pump spring assembly according to claim 1, characterized in that, The fixed guide sleeve, the movable guide sleeve, the small cylindrical section, and the guide rod ring all have chamfered ends that contact the compression spring.

5. The mechanical condensate recovery pump spring assembly according to claim 1, characterized in that, The depth of both the fixed guide sleeve and the receiving groove is greater than the size of the compression spring and its tight end.

6. The mechanical condensate recovery pump spring assembly according to claim 1, characterized in that, The fixed guide sleeve is welded and fixed inside the spring bracket and is located at the end of the spring mounting cavity facing the elongated hole.

7. The mechanical condensate recovery pump spring assembly according to claim 1, characterized in that, The small cylindrical section has a tightening bolt.

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